JP2007186626A - Moldable surplus water-containing exothermic composition, exothermic element and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exothermic element of a plurality of kinds of shapes using surplus water as a binder, moldable into a desired shape without collapsing corner or nook parts of a molded product of an exothermic composition even when moisture of the molded product of the exothermic composition is evaporated during a production process without presenting causes of defective sealing without making moisture in the exothermic composition function as an air blocking layer, causing an exothermic reaction at ≥10°C temperature rise within 5 min after being allowed to stand in air under windless environments at 20°C without being housed in an air-permeable housing bag just after production and without producing a bias of an exothermic substance during use and uneven heat generation caused thereby and to provide a method for producing the exothermic element. <P>SOLUTION: The exothermic composition consists essentially of iron powder, a carbon component, a reaction accelerator and water without containing an agglomeration aid, an agglomeration agent, a conglomeration aid, a dry binder, a drying binding agent, a dry binding material, a pressure-sensitive adhesive material, a thickener, an excipient and a water-soluble polymer. The composition contains surplus water of ≥0.01 to <14 water mobility value (content of surplus water) and powder of each component having ≤500 μm particle diameter and has ≥5 degree of moldability. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a moldable water-containing exothermic composition in which surplus water and a molding aid are combined, and the exothermic composition molded into various shapes of exothermic composition, laminated on the packaging material, and ultrathin with further packaging material enclosed. The present invention relates to a heating element of various shapes from thick to thick and a method of manufacturing the heating element.

In Patent Document 1 and Patent Document 2, a heating element is known in which an ink-like or cream-like heating composition or a paste-like viscous heating composition is enclosed in a packaging material. The exothermic composition has a thickener and excessive moisture. After the exothermic body is heated, the exothermic heat becomes unstable unless the moisture is removed.
In Patent Document 3 and Patent Document 4, a powdery exothermic composition that is exothermic in the presence of air, which is made by adding an excipient or a thickener, can be filled and sealed in an air-permeable inner bag. It is disclosed. However, it is for disposable body warmers, there are limitations on the shape of the heating element, and the production speed is also limited.
In Patent Document 5, an intermediate molded body such as a compressed body that does not contain water and does not generate heat when in contact with air is prepared, filled in a storage compartment, and a flat sheet is placed on the intermediate molded body. Although it has been disclosed that a heating element is manufactured by thermally bonding sheets, it is necessary to apply a predetermined amount of water for heating or an aqueous electrolyte solution after manufacturing the heating element. Therefore, the production speed is limited.

In order to have the stable heat generation and excellent moldability, Patent Document 6 proposes that the easy water value of the heat generating composition be 7 to 50 for the above problem.
However, since the exothermic composition of this document has good drainage, in some cases, when left in the air for a short time, moisture evaporates and an exothermic reaction starts from the surface, and the exothermic reaction continues as it is. However, there was a problem of high dependence on the surrounding environment. For this reason, immediately after mixing each component constituting the exothermic composition, an exothermic reaction in which the temperature rise is 10 ° C. or more is caused within 5 minutes after being left in air in a 20 ° C. airless environment. A heating element with good riseability was obtained only with a low probability.

JP-A-9-75388 JP-A-9-276317 Japanese Patent No. 7-194641 Japanese Patent Publication No. 6-343658 Japanese Patent No. 3161605 JP 2002-155273 A (paragraph 0033)

  The present invention uses surplus water as a binder and can be molded into a desired shape. During the manufacturing process, even if moisture of the exothermic composition molded body evaporates, the corners and corners of the exothermic composition molded body do not collapse, resulting in a poor seal. 20 ° C. that does not create the cause of the above, has good handling properties in the manufacturing process, does not function as an air barrier layer, and is not stored in a breathable storage bag immediately after manufacturing, and has no wind An exothermic composition having an excellent exothermic property that causes an exothermic reaction in which the temperature rise is 10 ° C. or more within 5 minutes after being left in the air in the environment of the above, and unevenness of the exothermic material during use and unevenness resulting therefrom An object of the present invention is to provide various types of heating elements that do not generate heat and a method of manufacturing the heating elements.

The formable surplus water exothermic composition of the present invention is an exothermic composition containing iron powder, a carbon component, a reaction accelerator and water as essential components as described in claim 1, and the exothermic composition is agglomerated. It does not contain auxiliaries, flocculants, agglomerates, dry binders, dry binders, dry binders, adhesive materials, thickeners, excipients and water-soluble polymers. It contains surplus water having a dynamic water value of 0.01 or more and less than 14, the particle size of each component is a powder of 500 μm or less, the molding degree is 5 or more, and the exothermic composition is a mixture of the components. Immediately after that, it is characterized in that an exothermic reaction with a temperature increase of 10 ° C. or more occurs within 5 minutes after being left in air in a 20 ° C. airless environment.
In addition, the heating element of the present invention, as described in claim 2, forms the moldable surplus water heating composition according to claim 1 as a heating composition molded body with a mold, and a substrate and a covering material. And a heating element having a heating part by sealing a peripheral edge of the heating composition molded body, wherein the heating part is similar to the heating composition molded body, and at least of the heating part It is characterized in that part is breathable.
In addition, the heating element of the present invention, as described in claim 3, forms the extrudable excess water heating composition according to claim 1 as a heating composition molded body with a mold, and forms the heating composition. A plurality of body parts are sandwiched between a base material and a covering material at intervals, and a peripheral part of the exothermic composition molded body is sealed to form a plurality of section heat generation parts. The exothermic composition molded body has a similar shape, and a section that does not substantially contain the exothermic composition is formed between the section heat generating portions, and the section heat generating section is individually cut when the heat generating body is formed. A plurality of segmented heat generating parts are cut as one piece without being processed, the length of the minimum side, which is the width of the segmented heat generating part, is 1 to 30 mm, and at least a part of the segmented heat generating parts has air permeability. And having uneven surfaces on both sides.
According to a fourth aspect of the present invention, in the heating element according to the third aspect, the minimum bending resistance in a plane orthogonal to the thickness direction of the heating element is 100 mm or less.
Further, the present invention according to claim 5 is the heating element according to claim 3 or 4, wherein the change in minimum bending resistance before and after the heat generation of the heating element is 30% or less. Features.
According to a sixth aspect of the present invention, in the heating element according to any one of the third to fifth aspects, the minimum bending resistance ratio in a plane orthogonal to the thickness direction of the heating element is 100 or less. It is characterized by.
According to a seventh aspect of the present invention, in the heating element according to any one of the second to sixth aspects, a fixing means is provided in at least a part of the exposed portion of the heating element.
The method for producing a heating element according to the present invention is a heating composition comprising iron powder, a carbon component, a reaction accelerator and water as essential components, as defined in claim 8, wherein the heating composition comprises an agglomeration aid. Containing no agent, flocculant, agglomeration aid, dry binder, dry binder, dry binder, adhesive material, thickener, excipient and water soluble polymer, the exothermic composition is mobile It contains surplus water having a water value of 0.01 or more and less than 14, the particle size of each component is a powder of 500 μm or less, the molding degree is 5 or more, and the exothermic composition is a mixture of the components. Immediately after that, a moldable excess water exothermic composition that causes an exothermic reaction with a temperature increase of 10 ° C. or more within 5 minutes after being left in air at 20 ° C. without wind is used. After forming the exothermic composition molded body by a molding method and laminating the exothermic composition molded body on the substrate , Covered with the covering material, and sealing the peripheral edge portion of the heat-generating composition molded article, at least part of the heating section is characterized in that so as to have air permeability.

Below, the preferable aspect of this invention is demonstrated.
The moldable excess water exothermic composition of the present invention is a mixture containing iron powder, a carbon component, a reaction accelerator and water as essential components, an aggregating aid, an aggregating agent, an agglomerating aid, a dry binder, and a drying agent. Does not contain binders, dry binders, adhesive materials, thickeners, excipients, water-soluble polymers, contains excess water with a mobile water value of 0.01 or more and less than 14 and is a solid of each component The component is a powder having a particle size of 500 μm or less, the degree of molding is 5 or more, the moisture in the exothermic composition does not function as an air barrier layer, is not stored in a breathable storage bag immediately after manufacture, and has no wind. It is preferable to cause an exothermic reaction in which the temperature rise is 10 ° C. or more within 5 minutes after being left in the air at a temperature of 0 ° C.
The heating element of the present invention comprises a heat-generating composition molded body obtained by molding a moldable surplus water heating composition formed by molding, laminated on a base material, and sandwiched between the base material and a covering material. In the heat generating element in which the heat generating part is formed by sealing the peripheral part of the heat generating part, it is preferable that the heat generating part is similar to the heat generating composition molded body, and at least a part of the heat generating part has air permeability. .
The heating element of the present invention comprises a moldable surplus water heating composition formed by molding at intervals, and two or more heating composition molded bodies are laminated on a substrate at intervals. In the heating element in which the heating part is formed by sandwiching between the material and the covering material and sealing the peripheral part of the heating composition molded body, the heating part is composed of the heating composition molded body. 2 or more of a plurality of divided heat generating portions and a divided portion that does not substantially contain the heat generating composition, and the divided heat generating portions are similar in shape to the molded heat generating composition, Are not individually cut at the time of forming the heating element, but two or more of the divided heating portions are cut as one piece, and the minimum side length, which is the width of the divided heating portion, is 1 to 30 mm. Is provided at intervals, and at least the divided heat generating portions are provided. Partially breathable, it preferably has an uneven surface on both sides.
In the heating element, it is preferable that the section heating portions are provided in a triply manner at intervals.
The heating element preferably has a minimum bending resistance of 100 mm or less in a plane orthogonal to the thickness direction of the heating element.
Further, the heating element preferably has a change in the minimum bending resistance of 30 or less before and after the heating element generates heat.
The heating element preferably has a minimum bending resistance ratio of 100 or less in a plane orthogonal to the thickness direction of the heating element.
Moreover, it is preferable that the heating element is provided with a fixing means in at least one part of the exposed part of the heating element.
The method for producing a heating element of the present invention is a mixture containing iron powder, a carbon component, a reaction accelerator and water as essential components, an aggregating aid, an aggregating agent, an agglomerating aid, a dry binder, a dry binder, Does not contain dry binders, adhesive materials, thickeners, excipients, water-soluble polymers, contains excess water with a mobile water value of 0.01 or more and less than 14 and the solid component of each component has a particle size It is a powder of 500 μm or less, the degree of molding is 5 or more, the moisture in the exothermic composition does not function as an air barrier layer, it is not stored in a breathable storage bag immediately after manufacture, and there is no wind at 20 ° C. environment A moldable surplus water exothermic composition that causes an exothermic reaction with a temperature increase of 10 ° C. or more within 5 minutes after being left in the lower air is molded into a exothermic composition molded body by a molding method, At least one type of covering material is a breathable packaging material, and the exothermic composition molded body is placed on the base material. After the layers, it covered the dressing, the periphery of the heat-generating composition molded article was heat sealed, it is preferable that at least part of the heat generating unit to produce a heating element having air permeability.
The method for producing a heating element of the present invention is a mixture containing iron powder, a carbon component, a reaction accelerator and water as essential components, an aggregating aid, an aggregating agent, an agglomerating aid, a dry binder, a dry binder, Does not contain dry binders, adhesive materials, thickeners, excipients, water-soluble polymers, contains excess water with a mobile water value of 0.01 or more and less than 14 and the solid component of each component has a particle size It is a powder of 500 μm or less, the degree of molding is 5 or more, the moisture in the exothermic composition does not function as an air barrier layer, it is not stored in a breathable storage bag immediately after manufacture, and there is no wind at 20 ° C. environment A moldable surplus water exothermic composition that causes an exothermic reaction with a temperature increase of 10 ° C. or more within 5 minutes after being left in the lower air is separated by a molding method between two or more exothermic composition molded bodies. In addition, at least one of the base material and the covering material is a breathable packaging material. After laminating the composition molded body on the base material at an interval, the covering material is placed on the base material, and the peripheral edge of the heat generating composition molded body is heat-sealed. Forming two or more divided heat generating portions by forming a divided heat generating portion and a divided portion that substantially does not contain the exothermic composition, and cutting the two or more divided heat generating portions together In the method of manufacturing a heating element having, the segmented heat generating part is similar in shape to the heat generating composition molded body, and the length of the minimum side which is the width of the segmented heating part not subjected to cutting treatment when the individual heating element is formed Is preferably 1 to 30 mm, and is provided at intervals with the sectioned portion as an interval. At least a part of the segmented heat generating portion has air permeability, and both surfaces of the heating element are preferably uneven surfaces.
In the heating element,
1) It is preferable that at least the exothermic composition and the exothermic composition molded body are compression-treated among the base material, the covering material, the air-permeable adhesive layer, the exothermic composition, and the exothermic composition molded body.
2) It is preferable that perforations (perforated perforations) are provided in the section.
3) It is preferable that at least a part of the seal part or the partition part has an uneven pattern.
4) It is preferable that the bending resistance ratio in the longitudinal direction of the heating element is 60 or less and the bending resistance ratio in the short direction is 80 or more.
The heating element preferably has a change in minimum bending resistance before and after the heating element is 30% or less.
Moreover, as for the manufacturing method of a heat generating body, it is preferable that the said cut is a staggered cut.

1. Although the moldable combined surplus water heating composition of the present invention has moldability, the temperature rise is 10 ° C or more within 5 minutes after being left in the air in a 20 ° C-free environment immediately after production. Since it has exothermic characteristics that cause a reaction, a heating element using the moldable excess water exothermic composition has excellent initial heat generation.
2. Since the exothermic composition of the present invention can be molded, various types of exothermic composition molded products with stable quality can be easily molded, and can be laminated on a smooth substrate, so that various types of exothermic bodies can be produced at high speed. Therefore, it is possible to provide a method for manufacturing a heating element that can greatly reduce the production cost.
3. Since the exothermic composition of the present invention is a moldable surplus water exothermic composition, it is not necessary to inject water into the exothermic composition molded body after sealing the exothermic composition molded body between the base material and the coating material. The manufacturing process is greatly simplified.
4). The pleated heating element having excellent flexibility, in which the segmented heat generating portion is provided in the stripe shape of the present invention, has excellent fit because the flexibility does not change before use, during use, after use, and sufficient It is possible to provide a heating element that can generate heat and does not cause uneven heat generation.

In addition to the above components, the moldable combined surplus water heating composition of the present invention includes water retention agents such as wood flour and vermiculite, water-absorbing polymers such as crosslinked poly (meth) acrylic acid, sodium sulfite, sodium thiosulfate, and the like. Hydrogen generation inhibitors, pH adjusters such as slaked lime, aggregates, functional substances, nonionics such as polyoxyethylene alkyl ethers, zwitterionic, anionic and cationic surfactants, hydrophobic polymer compounds such as polyethylene and polypropylene , Organosilicon compounds such as dimethyl silicone oil, far-infrared radiation materials such as pyroelectric materials and ceramics, negative ion generators such as tourmaline, exothermic aids such as FeCl ₂ , metals other than iron such as silicon and aluminum, manganese dioxide Metal oxides other than iron oxide such as, acidic substances such as hydrochloric acid, maleic acid and acetic acid, fibrous materials such as pulp, urea, etc. May contain at least one selected from the following fertilizer components, moisturizers such as glycerin and D-sorbitol, mold release agents, or mixtures thereof.
In addition, the component of the exothermic composition of this invention can select and use suitably any component of the exothermic composition conventionally disclosed or marketed or used for a well-known disposable body warmer or a heat generating body.

The formable water-containing exothermic composition of the present invention is an exothermic composition having formability and shape retention using excess water as a binder.
By having surplus water with a mobile water value of 0.01 or more and less than 14, surplus water connects the particles of the exothermic composition, so that the shape of the exothermic composition molded body can be prevented from being lost, and even when moved to the sealing process. The exothermic composition molded body does not collapse.
After molding the moldable water-containing exothermic composition, heat is generated without contact with air without water removal such as water absorption, dehydration, water absorption, dewatering, etc., and without adding water or an aqueous solution of a water-soluble component. .

The term “to generate heat with a temperature increase of 10 ° C. within 5 minutes after being left in air at 20 ° C. immediately after production” means a ripening period such as 24 hours after production of the exothermic composition 5 minutes when the exothermic composition is left on a non-water-absorbing material such as a polyethylene film, a polyester film or a sheet in air at 20 ° C. without air immediately after the production of the exothermic composition. The exothermic composition generates heat with a temperature increase of 10 ° C.
In the following exothermic composition temperature rise measurement method, the temperature rise within 5 minutes is preferably 10 ° C or higher, more preferably 15 ° C or higher, still more preferably 20 ° C or higher, and further preferably 30 ° C. More preferably, the increase in temperature is 10 ° C. or more within 3 minutes.
Here, the exothermic composition temperature rise measuring method uses the exothermic composition immediately after production or the exothermic composition molded body, and the sample is in contact with air when measuring under the condition of no wind and ambient temperature of 20 ± 1 ° C. Measure while ready.
1. In the case of the exothermic composition 1) A magnet is provided so as to cover the shape of the punched hole of the mold near the center of the back surface of the vinyl chloride support plate (thickness 5 mm × length 600 mm × width 600 mm) of the support base with legs.
2) Place the temperature sensor on the center of the support plate.
3) A polyethylene film with a thickness of 25 μm × length 250 mm × width 200 mm with an adhesive layer having a thickness of about 80 μm is attached to the support plate via the adhesive layer so that the center of the polyethylene film comes to the sensor.
4) On the central part of the polyethylene film, place a template plate of length 250 mm x width 200 mm with a hole 80 mm long x 50 mm wide x 3 mm high, place a sample near the hole, and place a push-in plate The sample is moved along the template, and the sample is pushed into the punched hole. The sample is scraped along the template surface while being pushed (mold press molding), and the sample is filled into the die. Next, temperature measurement is started except for the magnet under the support plate.
The exothermic temperature is measured using a data collector, measuring the temperature for 10 minutes at a measurement timing of 2 seconds, and determining the heat generation startability with the temperature after 3 minutes.
2. For exothermic composition molded bodies,
1) to 3) are the same as in the case of the exothermic composition.
4) The exothermic composition molded body is placed on the center of the polyethylene film, and temperature measurement is started.
The exothermic temperature is measured using a data collector, measuring the temperature at 2 seconds for 10 minutes, and measuring the temperature at 0 minutes, 1 minute, 3 minutes, 5 minutes, 6 minutes, and 7 minutes. The exothermic property is determined at a temperature within 5 minutes.

In the production of the heating element by the mold forming method of the present invention, the moldable water-containing exothermic composition is formed on the substrate while moving the substrate at a constant speed and moving the dropping port for dropping the exothermic composition at the same speed as the substrate. Since the exothermic composition molded body obtained by molding the product is laminated, the substrate is hardly stopped and started repeatedly, which is excellent in increasing the production speed.
Further, when the exothermic composition is water-containing, as described above, the exothermic composition, particularly iron powder and air, is produced during the period from the production of the exothermic body until the obtained exothermic body is sealed in an airtight outer bag. Oxidation reaction occurs, and the initial heat generation characteristics of the heat generating composition are improved, so that there is an advantage that a heating element with improved initial heat generation characteristics can be obtained.

In the moldable excess water exothermic composition of the present invention, the amount of excess water in the exothermic composition is defined as an easy water value.
The mobile water value of the moldable excess water exothermic composition of the present invention is preferably 0.01 or more and less than 14, more preferably 0.01 to 13.5, and still more preferably 0.01 to 13. More preferably, it is 0.01-12, More preferably, it is 1-12, More preferably, it is 2-12, More preferably, it is 3-12, More preferably, it is 4-12, More preferably, it is 5-12, More preferably, it is 5-11.

The solid exothermic composition raw material of the moldable excess water exothermic composition of the present invention is a powder, and the particle size thereof is preferably 500 μm or less, more preferably 425 μm or less, further preferably 300 μm or less, More preferably, it is 250 micrometers or less, More preferably, it is 212 micrometers or less, More preferably, it is 150 micrometers or less, More preferably, it is 106 micrometers or less, More preferably, it is 90 micrometers or less.
The particle diameter is a value obtained by displaying the amount passing through the sieve in μm units from the sieve opening (diameter of the sieve).
The moldability and shape retention of the moldable excess water exothermic composition are improved as the particle size of the water-insoluble solid component excluding the reaction accelerator, the water-soluble substance and water is smaller.

The mixing ratio of the exothermic composition is not particularly limited, but 1.0 to 50 parts by weight of a carbon component, 1.0 to 50 parts by weight of a reaction accelerator, and water with respect to 100 parts by weight of iron powder. The blending ratio is preferably selected so as to be 1.0 to 60 parts by weight.
Furthermore, the following may be added to the exothermic composition at the following blending ratio.
That is, with respect to 100 parts by weight of iron powder, water retaining agent 0.01 to 10 parts by weight, water-absorbing polymer 0.01 to 20 parts by weight, pH adjuster 0.01 to 5 parts by weight, hydrogen generation inhibitor 0.01 ~ 12 parts by weight, metal other than iron 1.0-50 parts by weight, metal oxide other than iron oxide 1.0-50 parts by weight, surfactant 0.01-5 parts by weight, hydrophobic polymer compound, bone Materials, fibrous materials, functional materials, organosilicon compounds and pyroelectric materials are each 0.01 to 10 parts by weight, moisturizers, fertilizer components and exothermic assistants are each 0.01 to 10 parts by weight, acidic substances 01 to 1 part by weight, release agent 0.001 to 5 parts by weight. In addition, you may make it mix | blend a magnetic body further and should just determine a mixing | blending ratio suitably as needed.
This blending ratio can also be applied to a reaction mixture and an exothermic mixture. The mobile water value of the reaction mixture is usually less than 0.01.
Moreover, you may make it mix | blend a magnetic body further and should just determine a mixing | blending ratio suitably as needed.

In order to improve the rise of the exothermic reaction of the exothermic composition, it is preferable to use an exothermic composition subjected to oxidation treatment or an exothermic composition containing activated iron powder.
1. Oxidation-processed exothermic composition There is no restriction on the method for producing the oxidation-processed exothermic composition, but the temperature rise is increased to 1 ° C or more by leaving or mixing the reaction mixture or exothermic composition in an oxidizing gas environment. An example is a method for producing an exothermic mixture. As an example, the method of contacting the oxidizing gas of the reaction mixture is a reaction having iron powder, a reaction accelerator and water as essential components, a water content of 0.5 to 20% by weight, and a mobile water value of less than 0.01. The mixture is contact-treated with an oxidizing gas and the temperature rise of the reaction mixture is raised to 1 ° C. or more within 10 minutes.
Further, if desired, water or an aqueous solution of a reaction accelerator is added to obtain an exothermic composition having a desired water content.
Components other than essential components may be added in a desired step of the production process.
Further, the oxidizing gas contact treatment may be present in a container or in a breathable sheet-like material such as a nonwoven fabric.
The oxidizing gas contact treatment may be any of stirring, non-stirring, flowing or non-flowing, and may be a batch type or a continuous type.
2. Activated iron powder-containing exothermic composition An exothermic composition containing activated iron powder.

The iron powder is not limited, but cast iron iron powder, atomized iron powder, electrolytic iron powder, reduced iron powder, sponge iron powder, and iron alloy powder thereof can be used as an example. Furthermore, these iron powders may contain carbon or oxygen, or may contain other metals, such as iron containing 50% or more of iron. The type of metal contained as an alloy or the like is not particularly limited as long as the iron component acts as a component of the exothermic composition, but examples include metals such as aluminum, manganese, copper, and silicon, and semiconductors. The metal of the present invention includes a semiconductor.
In the iron powder of the present invention, the content of metals other than iron is usually 0.01 to 50% by weight, preferably 0.1 to 10% by weight, based on the entire iron powder.

As the iron powder having an oxygen-containing film on at least a part of the iron surface,
A. An active iron powder obtained by subjecting an essential component of an exothermic composition or an acid substance or other necessary component to contact treatment with an oxidizing gas, partially oxidizing the iron component, and at least partially oxidizing the surface of the iron component. An active iron powder having a wustite content of 2 to 50% by weight as an X-ray peak intensity ratio of iron C.I. Iron powder having an iron oxide film having a thickness of 3 nm or more on the surface. An example of the active iron powder is a mixture of iron powder other than the active iron powder.

The thickness of the iron oxide film that is an oxygen-containing film covering the surface of the iron powder is usually 3 nm or more, preferably 3 nm to 100 μm, more preferably 30 nm to 100 μm, using Auger electron spectroscopy. More preferably, it is 30 nm-50 micrometers, More preferably, it is 30 nm-1 micrometer, More preferably, it is 30 nm-500 nm, More preferably, it is 50 nm-300 nm. By making the thickness of the iron-containing film of iron 3 nm or more, the thickness of the iron-containing film of iron can exert the effect of promoting the oxidation reaction, and contact the oxidizing gas such as air to immediately start the oxidation reaction. Can be started. If the thickness of the iron oxygen-containing coating is 100 μm or more, the heat generation time may be shortened, but it can be used depending on the application.
The other is active iron powder having wustite. The x-ray analysis of the wustite phase was performed using an X-ray analyzer, and the amount of wustite was evaluated as the ratio of the integrated intensity of the wustite 220 plane peak to the integrated intensity of the wustite 220 plane peak.
The amount of wustite contained in the iron powder is usually 2 to 50% by weight, preferably 5.01 to 50% by weight, more preferably 5.01 to 40% by weight, as an X-ray peak intensity ratio with iron. %, More preferably 6 to 40% by weight, still more preferably 7 to 30% by weight, and even more preferably 7 to 25% by weight. Even if it exceeds 50% by weight, the heat buildup is good, but the heat generation duration is shortened. If it is less than 2% by weight, the heat build-up property becomes dull.

The water may be from a suitable source. There are no restrictions on the purity and type.
The water content preferably contains 1 to 70% by weight of the exothermic composition.
In the case of a reaction mixture and an exothermic mixture before contact treatment with an oxidizing gas, 0.5 to 20% by weight of the reaction mixture or the exothermic mixture, more preferably 1 to 20% by weight, still more preferably 3 to 20% by weight. %, More preferably 4 to 15% by weight.

  The carbon component is not limited as long as it is a carbonaceous material. Examples thereof include carbon black, graphite, activated carbon and the like.

The reaction accelerator is not limited as long as it can accelerate the exothermic reaction.
Examples include metal halides such as sodium chloride and potassium chloride, metal sulfates such as potassium sulfate, nitrates such as sodium nitrate, acetates such as sodium acetate, and carbonates such as ferrous carbonate. . The electrolyte currently used for the well-known disposable body warmer and a heat generating body can also be used.
These reaction accelerators are usually used as an aqueous solution, but can also be used as a powder. When used as an aqueous solution of a reaction accelerator, it is handled as a liquid exothermic composition raw material, and the particle size of the solid raw material for preparing the liquid exothermic composition raw material is not limited.

The water-absorbing polymer is not particularly limited as long as it is a resin having a partially crosslinked structure or a crosslinked structure and having a water absorption ratio of 2 times or more with respect to its own weight. Moreover, what cross-linked the surface may be used. Conventionally known water-absorbing polymers and commercially available ones can also be used.
Examples thereof include a partially crosslinked product of a polymer compound having a carboxyl group or a salt thereof, or a partially crosslinked product of a polysaccharide.
Examples of the partially crosslinked product of the polymer compound having a carboxyl group or a salt thereof include, for example, a poly (meth) acrylate crosslinked product, a vinyl alcohol-acrylate copolymer crosslinked product, and a starch-acrylate graft copolymer. Examples thereof include a crosslinked polymer, a crosslinked acrylate-acrylamide copolymer, and a crosslinked polyvinyl alcohol-polymaleic anhydride graft copolymer. Examples of the partially cross-linked polysaccharides include carboxymethyl cellulose salt cross-linked bodies, starch-acrylate copolymer cross-linked bodies, and the like.

  The aggregate is not particularly limited as long as it is useful as a filler and / or useful for making the exothermic composition porous. Examples include fossil coral (coral fossil, weathered reef coral, etc.), bamboo charcoal, Bincho charcoal, silica-alumina powder, terra balloon, and the like.

  The release agent is not limited, but includes lubricating oil composed of mineral oil, synthetic oil, animal and vegetable oil, etc., high viscosity lubricating oil such as grease, natural wax, synthetic wax, silicone oil, fluororesin, stearic acid And stearates and the like.

The functional substance may be any substance as long as it has some function such as medicinal effect and aroma. Perfumes, herbs, herbs, herbal medicines, transdermal drugs, pharmaceutically active substances, fragrances, lotions, emulsions, poultices, fungicides, antibacterial agents, bactericides, deodorants or deodorants, magnetic substances, etc. As an example.
In addition, specific examples of functional substances include acidic mucopolysaccharides, chamomiles, horse chestnuts, vitamin E, nicotinic acid derivatives, blood circulation promoters such as alkaloid compounds, flavone derivatives, anthocyanidins, vitamin P, kinsen. Swelling improver such as silanol, terminaria, mayus, aminophylline, tea extract, caffeine, xanthene derivative, inosit, dextran sulfate derivative, escin, anthocyanidin, organic iodine compound, hardwood leather, horsetail, mannen wax, ginseng, hyaluro Slimming agents such as nidase, indomethacin, dl-camphor, ketoprofen, shoga extract, pepper extract, analgesics such as methyl salicylate, glycol salicylate, lavender, rosemary, citron, jeni Chromatography, peppermint, eucalyptus, rosewood, include perfumes orange etc., it can be used one or more kinds.

  The percutaneously absorbable drug is not particularly limited as long as it is percutaneously absorbable. For example, skin stimulants, analgesic anti-inflammatory agents such as salicylic acid and indomethacin, central nervous system agents (sleep sedatives) , Antiepileptics, psychiatric agents), diuretics, antihypertensives, vasodilators, antitussives, antihistamines, arrhythmic agents, cardiotonic agents, corticosteroids, local anesthetics, and the like. These drugs are used alone or in combination of two or more as required.

The heating element of the present invention will be described.
The heating element of the present invention is formed by laminating a heating composition molded body obtained by molding a moldable surplus water heating composition having an easy water value of 0.01 or more and less than 14, preferably 0.01 to 13.5, Further, it is covered with a covering material and the peripheral edge of the exothermic composition molded body is sealed. More preferably, the exothermic part contains a exothermic composition comprising the exothermic composition molded body, preferably a plurality, preferably 4 It consists of one or more divided heat generating portions and a divided portion that does not substantially contain the heat generating composition. Is a heating element.
A heating element having a minimum bending resistance of 100 mm or less in at least one direction on a surface orthogonal to the thickness direction of the heating element is preferable from the viewpoint of fit.
The heating element according to the present invention includes a single heating element having a single heating element and a heating element having a plurality of heating parts spaced apart by a dividing part. There is a heating element.
That is, the heating element of the present invention is
1) A single heating element heating element and / or a sectional heating element heating element,
2) The exothermic composition molded body is molded from the exothermic composition,
3) A part of the one heat generating part or a part of the divided heat generating part has air permeability,
4) The one heating part heating element has one heating part formed by heat-sealing the peripheral part of the heating composition molded body,
5) The divided heat generating portion heating element is an integrated structure comprising a divided heat generating portion formed by heat-sealing the peripheral portion of the exothermic composition molded body and a divided portion which is the heat sealing portion, and a plurality of divided heat generating portions. The part has a heating part provided at intervals, with the dividing part as an interval,
6) A heating element in which a peripheral portion of the heating element is sealed.
Further, the heating element of the present invention may have a fixing means at least at a part of the exposed portion.

  As other embodiments of the heating element of the present invention, corrugated covering material, ventilation adjusting material, micro heater, heat cloth, heating pad, telescopic heating element, joint peripheral packaging, foot temperature heating element, heating pack Examples include heating wraps, non-stretchable packaging material bending resistance specific heating elements, high / medium / low temperature heating elements, hot water heaters, flexible heating elements (band warmers), and the like.

The exothermic composition compact may be a exothermic composition compact in which the exothermic composition is compressed. In the present invention, the exothermic composition compact includes the exothermic composition compact.
A breathable pressure-sensitive adhesive layer may be provided between the substrate or the exothermic composition molded body and the covering material.
As the air conditioning material and the support, the base material and the covering material of the covering material can be used.

  The adhesive layer for fixing the air flow adjusting material is constituted by a material appropriately selected from commonly used heat seal materials, adhesives such as pressure-sensitive adhesives and epoxy adhesives. In particular, the pressure-sensitive adhesive is useful, and can be selected and used as desired from the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer of the fixing means.

  The single heating part heating element of the present invention is a heating element in which the heating part is formed of one heating part, and at least a part of the heating element has air permeability. The shape of the heating element and the shape of the heating part are not necessarily the same. Further, the heating element and / or the heating part may be provided with corners in a substantially arc shape (round shape) and the corners may be curved or curved.

The divided heat generating part heating element of the present invention is composed of a divided heat generating part that contains a heat generating composition molded body and a divided part that does not contain a heat generating composition molded body, and a plurality of divided heat generating parts with the divided parts as an interval, It is a heat generating body which has the heat generating part provided at intervals. At least a part of the heating element has air permeability.
The divided heat generating portion is a heat generating member that houses the exothermic composition molded body, wherein the divided portion is a seal portion, and the divided heat generating portion is provided with an interval between the divided portions. The shape of the heating element and the shape of the section heating part are not necessarily the same. Further, the heating element and / or the section heating part may be provided with corners in a substantially arc shape (R shape), and the corners may be curved or curved.

The shape of the exothermic composition molded body or the section heat generating portion may be any shape, but it is a planar shape, such as a circle, an ellipse, a football shape, a triangle, a square, a rectangle, a hexagon, a polygon, a star shape, a flower shape, a ring shape, etc. Is given as an example. In three-dimensional shape, disk shape, pyramid shape, spherical shape, cube shape, polygonal pyramid shape, cone shape, frustum shape, spherical shape, parallelepiped shape, cylindrical shape, rectangular parallelepiped shape, polyhedron shape, ellipsoid shape, Examples include a semi-cylindrical body shape, a semi-elliptical cylinder body shape, a bowl-shaped body, a cylindrical body shape, and an elliptic cylinder body shape.
Further, in these shapes, the corners may be provided in a substantially arc shape (R shape), the corners may be curved or curved, or the center may have a recess.
In the present invention, a region corresponding to a corner (corner at the end) such as a heating composition molded body, a heating section, a section heating section, a heating element, a seal section, a through hole, a concave portion, and a convex portion is formed in a substantially arc shape (R shape). ) May be provided.
Although there is no restriction | limiting in the curvature radius as this substantially circular arc shape (R shape) shape, Preferably it is 0.1-20.0 mm, More preferably, it is 0.3-10.0 mm, More preferably, it is 0. It is 0.1-5.0 mm, More preferably, it is 0.3-5.0 mm, More preferably, it is 0.3-3.0 mm, More preferably, it is 0.5-2.0 mm.

There is no limitation on the size of the heating part of the heating element composed of one heating part in the shape of a disk, a circle, an ellipse, or the like, but the height is preferably 0.1 mm to 20 mm. More preferably, it is 0.3 mm-20 mm, More preferably, it is 0.5 mm-20 mm, More preferably, it is 0.5 mm-10 mm, More preferably, it is 0.5 mm-8 mm.
The diameter is preferably 5 mm to 200 mm, more preferably 5 mm to 180 mm, still more preferably 5 mm to 150 mm, still more preferably 5 mm to 100 mm, still more preferably 5 mm to 50 mm. .
In addition, in the shapes other than the disk shape, circular shape, elliptical shape, and similar shapes (rectangle, rectangular similar shape, etc.), the size is not limited, but the length is preferably 5 mm to 200 mm, more preferably. It is 5 mm-180 mm, More preferably, it is 5 mm-150 mm.
The height is preferably 0.1 mm to 20 mm, more preferably 0.3 mm to 20 mm, more preferably 0.5 mm to 20 mm, more preferably 0.5 mm to 10 mm, and still more preferably. 0.5 mm to 8 mm.
The width is preferably 1 mm to 200 mm, more preferably 5 mm to 200 mm, more preferably 5 mm to 180 mm, still more preferably 5 mm to 150 mm, and still more preferably 5 mm to 100 mm.

  In the section heating part structure, the section heating part is formed in a unified structure having at least two facing surfaces, preferably a film layer substrate surface, wherein at least one surface is oxygen (air) permeable, When the exothermic composition molded body is accommodated, the exothermic composition molded body volume, the space volume, and the section heating part volume have the following relationship. The exothermic composition molded body volume is the volume of the exothermic composition molded body itself, the spatial volume is the volume not occupied by the exothermic composition molded body in the section heating section, and the section heating section volume is the section heating section volume. The volume is the sum of the space volume and the exothermic composition molded body volume.

Although there is no restriction | limiting in the size of the said division | segmentation exothermic part or the said exothermic composition molded object, A preferable size is as follows.
1) In the case of a circular shape, a disc shape, and a disc-like shape The diameter is preferably about 1 mm to about 60 mm, more preferably 2 mm to 50 mm, still more preferably 10 mm to 40 mm, and further preferably 20 mm to 30 mm. It is.
The height is preferably 0.1 mm to 20 mm, more preferably 0.3 mm to 20 mm, still more preferably 0.5 mm to 20 mm, still more preferably 1 mm to 20 mm, more preferably 1. It is 5 mm-10 mm, More preferably, it is 3 mm-9 mm, More preferably, it is 4 mm-8 mm, More preferably, it is 5 mm-7 mm.
The volume is preferably from about 0.0045 cm ³ to about 20 cm ³ , more preferably from about 0.2 cm ³ to about 11 cm ³ .
2) When the shape is other than 1) (rectangular shape, rectangular-like shape, etc.) The width is preferably 0.5 mm to 60 mm, more preferably 0.5 mm to 50 mm, and preferably 0.5 mm to 50 mm. More preferably, it is 1 mm-50 mm, More preferably, it is 3 mm-50 mm, More preferably, it is 3 mm-30 mm, More preferably, it is 5 mm-20 mm, More preferably, it is 5 mm-15 mm, More preferably Is 5 mm to 10 mm.
Further, the height is preferably 0.1 mm to 30 mm, more preferably 0.1 mm to 20 mm, still more preferably 0.1 mm to 10 mm, still more preferably 0.3 mm to 10 mm, and further Preferably they are 0.5 mm-10 mm, More preferably, they are 1 mm-10 mm, More preferably, they are 2 mm-10 mm.
Further, the length is preferably 5 mm to 300 mm, more preferably 5 mm to 200 mm, more preferably 5 mm to 100 mm, still more preferably 20 mm to 150 mm, and further preferably 30 mm to 100 mm.
Further, the surface area is not limited as long as it has a function as a segmented heat generating portion, but is preferably about 50 cm ² or less, more preferably about 40 cm ² or less, still more preferably less than about 25 cm ² , still more preferably. Is less than 20 cm ² .
The volume of the section heat generating part or the volume of the exothermic composition molded body is preferably 0.015 cm ^{3 to} 500 cm ³ , preferably 0.04 cm ^{3 to} 500 cm ³ , more preferably 0.04 cm ^{3 to 30} cm ^3. , and still more preferably from 0.1cm ³ ~30cm ^3, more preferably from ^{1cm 3 ~30cm} 3, still more preferably from 1.25 cm ³ to 20 cm ^3, more preferably 1.25cm ³ ~10cm ³ , and still more preferably from ^{3cm 3 ~10cm} 3.

  When the exothermic composition molded body is accommodated in the segmented exothermic part, which is the exothermic composition part accommodating area, the volume of the exothermic composition molded body and the exothermic composition are accommodated in the segmented exothermic part. The volume ratio with the volume of the segmented heat generating portion that is the region is usually 0.6 to 1, preferably 0.7 to 1, more preferably 0.8 to 1, and still more preferably 0.9 to 1. 1. In the case of a single heat generating part, the above-mentioned divided heat generating part shall be read as a heat generating part.

In the present invention, the section heat generating portions are provided in the form of stripes at intervals. The plurality of section heat generating portions are spaced in stripes (elongated and continuous) (parallel lines, parallel curves, etc.). ) Provided. One streak is preferably composed of one section heat generating portion. In this case, the section heating section and the section section may be linear or curved.
Moreover, as long as the following conditions are satisfied, one streak may be composed of two or more divided heat generating portions and one or more divided portions.
T is T ≧ 2 × S, and preferably T ≧ 2.5 × S.
P is P ≦ T, and preferably P ≦ 0.5 × T.
T: Length of one section heat generating portion S: Width of one section heat generating portion P: Length of section section Parallel stripes (vertical stripe, horizontal stripe, diagonal stripe, vertical wave stripe, horizontal wave stripe, diagonal wave stripe, etc. For example, a streak made up of segmented heat generating portions may be arranged in ().

  The width of the dividing portion is not limited as long as the dividing heat generating portion can be provided with an interval, but is usually 0.1 mm to 50 mm, preferably 0.3 mm to 50 mm, more preferably 0.00 mm. It is 3 mm-50 mm, More preferably, it is 0.3 mm-40 mm, More preferably, it is 0.5 mm-30 mm, More preferably, it is 1 mm-20 mm, More preferably, it is 3 mm-10 mm.

  In the present specification, the exothermic composition part molded body means both the exothermic composition part molded body and the exothermic composition compressed body which is a compressed exothermic composition molded body.

The packaging material constituting the base material, covering material, ventilation adjusting material and support of the present invention is not limited as long as it functions as a heating material packaging material. For example, non-breathable material, breathable material, water-absorbing material, non-water-absorbing material, non-stretchable material, stretchable material, stretchable material, non-stretchable material, foamed material, non-foamed material, non-heat as packaging material Examples thereof include a sealing material, a heat sealing material, and the like, and can be appropriately used depending on a desired application in a desired form of a composite such as a film, a sheet, a nonwoven fabric, a woven fabric, and a laminate thereof.
The base material of the present invention is a packaging material on which the exothermic composition molded body is laminated, and the coating material is a packaging material that covers it, regardless of whether it is breathable or non-breathable. .
Usually, the base material is made of a non-breathable film or sheet, and the covering material is made of a breathable film, sheet or nonwoven fabric, but it may be reversed or both may be breathable.
In addition, the packaging material used for the exothermic heating element of the present invention is appropriately selected from any packaging materials that have been disclosed in the past, are commercially available, or are used for known disposable warmers or heating elements. it can.

  When the packaging material is laminated via a breathable adhesive layer, the formation of the breathable adhesive layer is performed by a curtain spray method, a melt blow method, a slot spray method, etc., in which an adhesive substance is sprayed and expanded through hot air under heat and melting, etc. As an example, a method of forming an adhesive layer in a porous state by forming an adhesive substance into a fiber by an appropriate method, and spreading and depositing on an appropriate support base material made of a porous film, a breathable base material, a separator, or the like.

  The thickness of the base material, the covering material, the air flow adjusting material, and the packaging material constituting the support body is greatly different depending on the application, but is not limited. The thickness of the packaging material is preferably 1 μm to 5,000 μm, more preferably 5 μm to 1,000 μm, still more preferably 5 μm to 500 μm, still more preferably 5 μm to 250 μm, and even more preferably 10 μm. ˜100 μm.

In the case where the heat-sealed portion is temporarily attached, and the heat-sealed portion is provided by heat sealing, the seal strength of the temporary-attached portion is preferably 0.5 kg / 25 mm to 1 kg in a 20 ° C. environment. / 25 mm, more preferably 0.5 kg / 25 mm to 0.9 kg / 25 mm, and still more preferably 0.5 kg / 25 mm to 0.8 kg / 25 mm.
The 60 ° C. seal strength is preferably less than 0.8 kg / 25 mm, more preferably 0.01 kg / 25 mm or more and less than 0.8 kg / 25 mm, and still more preferably 0.01 kg / 25 mm to 0.5 kg. / 25 mm, more preferably 0.01 to 0.4 kg / 25 mm.
The seal strength of the heat-sealed part heat-sealed after temporary attachment under an environment of 20 ° C. is preferably 1.0 kg / 25 mm or more, more preferably 1.2 kg / 25 mm or more, and further preferably 1.5 kg / It is 25 mm or more, and more preferably 1.5 kg / 25 mm to 3 kg / 25 mm.
The 60 ° C. seal strength in a 60 ° C. environment is preferably 0.8 kg / 25 mm or more, more preferably 1.0 kg / 25 mm or more, further preferably 1.2 g / 25 mm or more, Preferably it is 1.5 kg / 25 mm or more.

Breathable packaging material and the heat generating portion and the segment heating portion is preferably in moisture permeability by Risshi method (JIS K-7129A method) was ^{50g / m 2 / 24hr~10,000g / m} 2 / 24hr, more preferably 100 g ^/ m was ^{2 / 24hr~5,000g / m 2 / 24hr} , more preferably ^{100g / m 2 / 24hr~600g / m} 2 / a is more preferably ^{24hr 150g / m 2 / 24hr~500g /} m 2 / 24 hr.
If the air permeability is lower than these ranges or the moisture permeability is low, the calorific value tends to be insufficient. On the other hand, if the air permeability is high or the moisture permeability is high, the maximum temperature of the heating element becomes too high and the human body is burned. This is because there is a risk of incurring.

  The thickness of the adhesive layer is not limited as long as the air flow adjusting material can be fixed, but is preferably 1 μm to 1000 μm, more preferably 5 μm to 1000 μm, still more preferably 10 μm to 100 μm, and even more preferably 15 μm. ˜250 μm.

  The thickness of the pressure-sensitive adhesive layer is not limited as long as the heating element can be fixed, but is preferably 5 μm to 1000 μm, more preferably 10 μm to 100 μm, and still more preferably 15 μm to 250 μm.

As the non-breathable packaging material, a single layer or laminated film, sheet or foam which does not substantially transmit oxygen or air can be used. Conventionally, non-breathable packaging materials used for chemical warmers and non-breathable storage bags (outer bags) can also be used.
Polyethylene, polypropylene, polyester, polyamide, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyurethane, ethylene-vinyl acetate copolymer EVOH (ethylene-vinyl alcohol copolymer, saponified ethylene-vinyl acetate copolymer) film Films, sheets, coatings made of thermoplastic synthetic resin such as biaxially stretched polyvinyl alcohol film, polyvinylidene chloride coated film, polyvinylidene chloride coated film made of polypropylene, etc. Examples thereof include a laminate of a metal (including semiconductor) compound such as silicon oxide and a composite material using them.

The breathable packaging material is not limited as long as it has breathability that allows the heating element to function.
For example, breathable films such as porous films and perforated films, papers, breathable packaging materials such as nonwoven fabrics, breathable laminates obtained by laminating at least two of them, and non-breathable packages obtained by laminating polyethylene films on nonwoven fabrics Made of fine holes using a needle etc. in the material to make it breathable, nonwoven fabric, porous film with fibers laminated and thermocompression-bonded to control breathability, or commercial vacuum cleaner dust collection An example is a vacuum cleaner dust collection filter material such as a bag filter material.
The perforated film is a non-breathable packaging material such as a polyethylene film that is provided with fine holes with a laser or a needle so that the breathability is awaited. In addition, a non-breathable material such as hot melt adhesive is applied to a breathable material such as non-woven fabric in a spot pattern, etc., and expanded to reduce the oxygen permeable region to about 1% of the non-woven fabric region. Also good.
Although there is no restriction | limiting as said porous film, It can select suitably with the porous film which extended | stretched the film which consists of thermoplastic resins, such as polyethylene and a polypropylene, and a filler.
Although there is no restriction | limiting as said nonwoven fabric, The single nonwoven fabric which consists of materials, such as polyethylene, a polypropylene, rayon, nylon (polyamide), polyester, the single nonwoven fabric of a composite fiber, or the lamination of those fibers, or lamination | stacking of a cumulative fiber layer is used. .

Examples of the foam include foams such as urethane and polypropylene.
The stretchable packaging material is not particularly limited as long as it has stretchability. That is, as long as it is stretchable as a whole, it may be a single product or a composite product composed of stretchable substrates or a combination of a stretchable substrate and a non-stretchable substrate.
For example, natural rubber, recycled rubber, synthetic rubber, elastomer, stretchable shape memory polymer and other single products or mixtures thereof, blends of these with non-stretch materials, blended products, and fabrics composed of these combination crystals, Examples include films, yarns, strands, ribbons, tapes, scrim structure elastic films, and the like.

Examples of the stretchable material include a stretchable film, sheet, nonwoven fabric, knitted fabric, woven fabric, or a laminate thereof. The thickness is at least 1.2 times the original length without damaging the flexible holding part when a tensile force is applied to the flexible holding part formed using these. There is no particular limitation as long as it extends. Examples thereof include a single layer film made of a synthetic resin such as an elastomer or a laminate of an elastomer and a nonwoven fabric, and a laminate made of a synthetic resin. For example, the thickness of the synthetic resin monolayer film is not limited, but is preferably 5 to 15 μm.
The non-extensible material is a material other than the extensible material.
Elasticity refers to the property of a material that stretches in the direction of force without being damaged when a tensile force is applied and returns to its original length when tension is removed.

Examples of the elastic material include styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), synthetic rubber such as urethane, 0.88 to 0.900 g. Examples include a film made of an amorphous olefin resin selected from a density of / cm ³ , a perforated foam film, a net, and a perforated nonwoven fabric. Further, a woven fabric or a fabric in which a spun filament made of synthetic rubber is used as a raw material can be used. Examples include spunbond nonwoven fabrics, melt-prone nonwoven fabrics, foam foam sheets, so-called stretchable spunbonds, etc., in which continuous fibers are forcibly tentered in the longitudinal direction after being formed into a sheet by heat sealing. As mentioned.

  When using a non-extensible material with extensibility, PE / PP, PE / PET having a heat shrinkability in which the core component is composed of a high melting point and the sheath component is composed of a low melting point component from the nonwoven fabric. A bulky through-air nonwoven fabric made of composite synthetic fiber such as PP / PP, treated with hot air, spunlace nonwoven fabric in which fibers are entangled with water pressure, spunbond nonwoven fabric in which continuous fibers are laminated into a sheet, needle In addition to needle-punched non-woven fabric in which fibers are entangled with each other, SMS non-woven fabric obtained by laminating spunbond and melt-prone in multiple layers, perforated foam film, perforated non-woven fabric (cut lines, cut into circles, etc.), elastomers, The material which consists of the film etc. which have it as a main component individually or in combination of these is mentioned. It is also possible to impart extensibility by corrugating, in which the above materials are combined between male and female molds and the shape is embossed by heat, temperature and pressure.

  In the present invention, the heat seal material constituting the heat seal layer may be a single material or a composite material having a heat seal layer, and there is no limitation as long as at least a part of the heat seal material can be joined by heating. For example, low-density polyethylene, polyolefins such as polyethylene using a metallocene catalyst, coatings such as ethylene-vinyl acetate copolymer resin, films, sheets, and the like can be given as examples.

Here, the base material and the covering material in the present invention are not distinguished by the material composition, but the material on which the exothermic composition molded body is laminated is defined as the base material, and then covered with the base material or the exothermic composition molded body. Defined material is defined as a covering material.
The base material and the covering material are preferably made of a packaging material such as a heat-sealable thermoplastic resin film or sheet. Usually, the base material is non-breathable and the covering material is breathable. However, the base material is breathable, the covering material may be non-breathable, and both may be breathable.
In this specification, regarding the air permeability of the heat generating element, it is sufficient that at least a part of the heat generating part or the section heat generating part has air permeability.

In the present invention, a pressure-sensitive adhesive is used before heat-sealing the base material and the covering material, and preferably, the base material and the covering material are temporarily attached using a breathable pressure-sensitive adhesive layer made of an adhesive. After forming, heat sealing may be performed. The heat seal part has at least a part of an area composed of an adhesive and a heat seal material constituting the temporary attachment part. Wrinkles do not occur, seals are not broken, and reliable heat sealing is possible. Thereby, the speed of heat sealing can be increased.
In addition, there is no restriction | limiting in the method of providing the adhesion layer for temporary attachment, You may provide in the whole surface, and may provide partially or intermittently. Various shapes such as a net shape, a stripe shape, a dot shape, and a belt shape are listed as examples.

  In addition, as an opening, a temporary attachment part is provided wider than a heat seal part, a narrow heat seal is performed, and after a narrow heat seal part is provided, a stick, a plate, a roll, a balloon, etc. Pressing, squeezing, or pushing the heat generating part to open the unheat-sealed temporary attachment part, move a part of the exothermic composition molded body to the unheat-sealed temporary attachment part, A heating element having a narrow heat seal portion may be manufactured.

The fixing means is not limited as long as it has a fixing ability capable of fixing the heating element to a required portion. Adhesive layers, key hooks, hook buttons, hook-and-loop fasteners such as Velcro (registered trademark) and Velcro, magnets, bands, strings, etc., and combinations thereof, which are generally employed as the fixing means, are arbitrarily selected. Can be used. In the case of a band, the adjustment fixing means may be further configured by a combination of a hook-and-loop fastener and an adhesive layer.
Moreover, you may provide a separator to a fixing means as protection until it is used. The separator may be provided with a cut or the like such as a split to facilitate peeling.

The pressure-sensitive adhesive layer is composed of a pressure-sensitive adhesive. The pressure-sensitive adhesive is not limited as long as the heating element can be fixed, and those conventionally used for chemical warmers, heating elements and poultices, and those technically disclosed can be used.
The pressure-sensitive adhesive layer is composed of a water retention agent, a water-absorbing polymer, a pH adjuster, a surfactant, an organosilicon compound, a hydrophobic polymer compound, a pyroelectric material, an antioxidant, an aggregate, a fibrous material, a moisturizing agent, and a function. You may contain at least 1 sort (s) chosen from the additional component which consists of a sex substance or these mixtures.
The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is not limited as long as it has an adhesive force necessary to adhere to the skin and clothes, and is solvent-based, aqueous-based, emulsion-type, hot-melt-type, reactive, Various forms such as a pressure sensitive system, a non-hydrophilic adhesive, a mixed adhesive, a hydrophilic adhesive (gel, etc.) are used.
Moreover, as an adhesive layer, even if it has air permeability, it may not have air permeability. What is necessary is just to select suitably according to a use. As the air permeability, it is sufficient if the air permeability is as a whole. For example, a pressure-sensitive adhesive layer in which a pressure-sensitive adhesive partially exists, a part in which a pressure-sensitive adhesive does not exist is partially present, and the whole region has air permeability is given as an example.
The pressure-sensitive adhesive may be laminated as it is on the breathable base material and / or the covering material, or the pressure-sensitive adhesive laminated on the separator may be attached to the base material and / or the covering material.

Further, the pattern, shape, and method of providing the pressure-sensitive adhesive layer, pressure-sensitive adhesive layer, and adhesive layer are not limited as long as the heating element can be fixed, and may be provided on the entire surface or may be provided partially or intermittently.
As a method for maintaining the air permeability, for example, various patterns and shapes such as a net shape (spider web shape), a rod shape, a stripe shape, a polka dot shape, a lattice shape, and a belt shape are printed in any form, There is a method in which the pressure-sensitive adhesive layer is partially laminated by transfer, nozzle injection, or the like.
For example, the adhesive material is made into a fiber by an appropriate method such as a melt blow method, a curtain spray method, or a gravure method in which a hot melt type adhesive material is blown and developed through hot air while being heated and melted, or an adhesive. For example, a method of partially applying by moving in a two-dimensional direction such as moving in one direction while drawing a circle in a thread shape or moving in a zigzag manner or a method of foaming an adhesive can be given.

  The pressure-sensitive adhesive constituting the non-hydrophilic pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive, a styrene-butadiene-styrene block copolymer (SBS), a styrene-isoprene-styrene block copolymer (SIS), or a hydrogenated type thereof ( Examples thereof include styrenic hot melt pressure-sensitive adhesives having SEBS, SIPS) or the like as a base polymer.

The hydrophilic pressure-sensitive adhesive constituting the hydrophilic pressure-sensitive adhesive layer is not particularly limited as long as it has a hydrophilic polymer or a water-soluble polymer as a main component, has adhesiveness, and is hydrophilic as the pressure-sensitive adhesive. The hydrophilic adhesive currently used for the well-known warmer, a heating element, a patch, etc. can be used.
Specifically, hydrophilic polymers such as polyacrylic acid, water-soluble polymers such as sodium polyacrylate and polyvinylpyrrolidone, carboxymethylcellulose, sodium carboxymethylcellulose, and the like are listed as examples.

Moreover, when the adhesive layer is a hydrophilic adhesive layer, if there is a difference in moisture retention between the hydrophilic adhesive layer and the exothermic composition molded body, a packaging material such as a substrate between them Moisture movement takes place via this, and inconvenience occurs for both. This happens especially during storage. In order to prevent this, the moisture permeability of the moisture-proof packaging material, which is a packaging material interposed between them, is not limited as long as moisture movement can be prevented within a range that does not affect the heat generation performance, but the rissy method (Lyssy method) ), Preferably 2 g / m ² / day or less, more preferably 1.0 g / m ² / day or less, still more preferably 0.5 g / m ² / day or less, preferably from ^{0.01g / m 2 /day~0.5g/m 2 / day} . Here, it is a value under the conditions of 40 ° C. and 90% RH under atmospheric pressure. In addition, the said moisture-proof packaging material can be used as a base material or a covering material, and may be laminated on a base material or a covering material alone.
The moisture-proof packaging material is not limited as long as moisture transfer between the exothermic composition molded body and the hydrophilic pressure-sensitive adhesive layer can be prevented. An example is a foil laminate film. The non-breathable material can also be used.
In addition, a packaging material such as a moisture-proof packaging material disclosed in Japanese Patent Application Laid-Open No. 2002-200108 can also be used, and the description is incorporated into the present invention.
When a water-containing hydrophilic adhesive (gel etc.) is used for the adhesive layer, a reaction accelerator such as sodium chloride in the exothermic composition, The content of a substance capable of securing moisture such as a water-absorbing polymer is in the range of 10 to 40% by weight, preferably in the range of 1.5 to 40% by weight, more preferably 15 to 30%, based on the exothermic composition. You may adjust in the range of weight%.
Examples of the pressure-sensitive adhesive having good moisture permeability and low irritation to the skin include water-containing pressure-sensitive adhesives (hydrophilic pressure-sensitive adhesives and gels) such as JP-A-10-265373 and JP-A-9-87173. No. 6-145050, JP-A-6-199660, hot-melt adhesives and rubber-based adhesives described in JP-A-10-279466 and JP-A-10-182408 JP-A-10-279466 and JP-A-10-182408, rubber-based pressure-sensitive adhesives, emulsion-type pressure-sensitive adhesives having wet surface adhesion as disclosed in JP-A-2004-263054 and JP-A-2004-263055, An aqueous emulsion type adhesive having a wet surface adhesion of 2001-143294 is also useful and is incorporated herein by reference in its entirety.

  In the base material, the covering material, the air flow adjusting material, the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer, the adhesive layer, and the separator constituting the heating element, at least one of them or a part thereof is a character, a pattern, a symbol, a number, a pattern, Any one or more of a photograph, a picture, and a coloring part may be provided. Moreover, when each material and layer are comprised by the multilayer, the installation layer should just determine suitably.

  In the base material, the covering material, the air flow adjusting material, the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer, the adhesive layer, and the separator constituting the heating element, each may be any of transparent, opaque, colored, non-colored, and the like. Moreover, the layer which comprises at least 1 layer among the layers which comprise each material and each layer may be colored in the color different from another layer.

  The minimum bending resistance of the heating element having the plurality of section heating portions is preferably 100 mm or less, more preferably 1 mm to 100 mm, still more preferably 1 mm to 90 mm, still more preferably 1 mm to 80 mm, Preferably they are 1 mm-70 mm, More preferably, they are 1 mm-60 mm, More preferably, they are 5 mm-60 mm, More preferably, they are 10 mm-50 mm. Thereby, a favorable touch is obtained at the time of contact with the body or use.

  The minimum bending resistance ratio of the heating element having the plurality of divided heating portions is preferably 100 or less, more preferably 1 to 100, still more preferably 1 to 80, and further preferably 1 to 50. More preferably, it is 1-40, More preferably, it is 1-30, More preferably, it is 5-30.

  With respect to the minimum bending resistance before heat generation of the heating element having the plurality of segment heating portions, the change in bending resistance of the heating element after the end of heat generation is preferably 30 or less, more preferably 0 to 0. It is 30, More preferably, it is 0-20, More preferably, it is 0-10, More preferably, it is 0-5, More preferably, it is 0. Thereby, the flexibility in at least one direction of the heating element does not change greatly before, during, and after the heat generation.

The heating element may be stored in an outer bag, which is a non-breathable storage bag, and stored and transported. As long as the outer bag is non-breathable, the outer bag is not limited and may be laminated.
The non-breathable packaging material can be used as the packaging material of the outer bag. As an example, the manufactured heating element is interposed between two non-breathable films or sheets, and at the same time as or after this intervention, the two films or sheets are more than the heating elements. An example is a heating element in which the two films or sheets are sealed in a peripheral part exceeding the size of the heating element at the same time after punching or after punching.

  Since the heating element of the present invention can be obtained in various shapes, thicknesses, and temperature zones, it is not for normal body warming, for joints, for facial use, for eyes, for slimming, for drip solution warming / warming, warmth For poultice, drug body warmers, neck, waist, mask, gloves, heels, or for relief of symptoms such as shoulder pain, muscle pain, menstrual pain, cushions, warming and warming of the human body during surgery It can be used for various uses such as for heating, for heating sheets, for transpiration fragrance, for abdomen, for transpiration insecticide, and for medical treatment. Furthermore, it can be used for warming / insulating machines and pets.

  The heating element of the present invention will be described with reference to FIGS. The heating element of the present invention is not limited only to the description in this figure.

  FIG. 1A shows an example of a rectangular heating element, and is a plan view of a heating element 1 in which a plurality of section heating portions 2 are provided in a stripe shape (stripe shape) at a predetermined interval. Eight divided heat generating portions 2 are provided via a divided portion 3 formed of a heat seal portion, and a central divided portion 3 ′ has a wider width than the other divided portions 3.

The exothermic body 1 includes an exothermic composition molded body 7 obtained by molding a moldable excess water exothermic composition between a base material 4 and a covering material 8, and a peripheral portion of the exothermic composition molded body 7 is provided. The section heat generating part 2 including the heat generating composition molded body 7 and the heat sealed part 3 are configured. The heating element 1 has flexibility.
The minimum bending resistance of the heating element 1 is 100 mm or less, and the bending resistance of at least one direction of the heating element 1 is preferably 100 mm or less. Further, the bending resistance ratio in the direction having the minimum bending resistance of the heating element 1 is 50 or less. The minimum bending resistance ratio is 100 or less.
The change in the minimum bending resistance is 0 before and after the heat generating body 1 generates heat.

The heating element 1 is provided with a solid pressure-sensitive adhesive layer 5 with a separator 6 on the base 4 side which is a non-breathable surface, as shown in the sectional view along the line ZZ in FIG.
The heating element 1 is attached to the outside of the clothes and used to transfer heat to the body through the clothes.
An example of the adhesive layer 5 is an acrylic solid type adhesive layer.

  FIG.1 (c) is an example of the heat generating body 1 remove | excluding the adhesive layer 5 with the separator 6 from the heat generating body 1 of Fig.1 (a).

FIG. 2A is a plan view showing an example of a broad bean-shaped heating element 1.
Eight divided heat generating portions 2 are provided at intervals by a divided portion 3 formed of a heat seal portion, and a divided portion 3 ′ in the central portion has a wider width than the other divided portions 3.
In addition, the heating element 1 has a mesh-like (honeycomb-like) breathable pressure-sensitive adhesive layer 9 on the breathable surface side as shown in the Y-Y cross section of FIG. It is covered with a further covering material 10. This breathable pressure-sensitive adhesive layer 9 is provided by hot-melt pressure-sensitive adhesive, which is a pressure-sensitive heat-soluble adhesive, in a mesh shape (honeycomb shape) by a melt blow method.
As an example of how to use the heating element 1 shown in FIG. 2, the heating element 1 is attached to the inside of the panty, and the surface on which the adhesive is not provided is brought into contact with the body side to transfer heat to the body. Use as you do.
It should be noted that the same function can be obtained by providing the heating element 1 with a solid pressure-sensitive adhesive layer at the air-permeable surface side section.

FIG. 3A is a plan view showing an example of a rectangular heating element 1.
Six section heat generating sections 2 are provided via a section section 3 composed of a heat seal section, and the center section section 3 ′ has a wider width than the other section sections 3.
Further, as shown in FIG. 3B, a cross section taken along the line XX of FIG. 3A, the heating element 1 further includes a solid adhesive layer 5 on the air-permeable surface side section 3. A covering material 10 is used to apply a heating element to the inside of the garment in the same manner as the heating element 1 in FIG. Use it as if to communicate. The pressure-sensitive adhesive layer 8 is made of an acrylic solid type pressure-sensitive adhesive.

Fig.4 (a) is a top view which shows an example of the hot water heater 11 whose planar shape is circular. FIG. 4B is a cross-sectional view taken along the line ZZ.
The warmer 11 sandwiches the exothermic composition molded body 7 obtained by molding the moldable excess water exothermic composition between the base material 4 and the covering material 8, and has an adhesive layer with a separator 11 on one surface of the exposed surface. 9 is a heating element. This warming device 2 is also attached to the skin and used so as to transfer heat to the body.

FIG. 4C is a modification of the warmer 2 of FIG. 4A, and is a warmer 11 in which a hole 12 (having a diameter of about 3 mm) is provided in the center of the adhesive layer 8.
The covering material 8 for ensuring the air permeability of the warming device 11 is not limited as long as heat generation can be maintained. The porous film, the perforated film, the perforated film, and the filter material for the vacuum cleaner dust bag. Etc. are mentioned as an example. In consideration of the air permeability, a perforated film is preferable.

The air permeability of the covering material 8 is a gas permeability in accordance with the Gurley gas permeability measured by JIS P8117, preferably 9 sec / 3000 cc or less, more preferably 5 sec / 300 cc or less, more preferably It is 3 sec / 300 cc or less, more preferably 2 sec / 300 cc or less.
Further, since the gas permeability according to the Gurley gas permeability is about 0.4 sec / 300 cc, the measurement limit is about 0.4 sec / 300 cc. Therefore, the gas permeability exceeding the measurement limit is preferably fragile air permeability according to the measurement method of JIS L1096, preferably 40 cc. / Cm ² / sec or less, more preferably 1 to 40 cc / cm ² / sec, still more preferably 1 to 20 cc / cm ² / sec, and even more preferably 1 to 10 cc / cm ² / sec. .
On the other hand, if the gas permeability according to the Gurley gas permeability exceeds 9 cc / cm ² / sec, the air permeability is insufficient, the heat generation startability is lowered, and the maximum temperature reached is lowered.

Moreover, when using the vacuum cleaner dust bag filter material, a commercially available vacuum cleaner dust bag filter material can be used.
Also, for example, plant fibers such as hemp pulp, wood pulp, and esparto pulp, regenerated fibers such as rayon fibers, synthetic fibers such as vinylon fibers and polyester fibers, synthetic binder fibers such as PVA fibers and polyester binder fibers, and micro glass Filter material made by wet papermaking by mixing fibers at an appropriate ratio, and an emulsion binder impregnated on a sheet composed of one or two layers consisting of plant fibers, synthetic fibers, synthetic binder fibers, and micro glass fibers What was processed can also be used as a coating material.

  FIG. 5 is an example of the heating element 1 in which the elliptical segmental heating portions are provided at predetermined intervals in the vertical and horizontal directions.

  FIG. 6A shows a heating element 1 provided with two heating parts 2 sandwiching a section 3 which is a central seal part. FIG. 6B is a cross-sectional view taken along the line V-V.

FIG. 7A is a plan view showing an example of the heating element 1 with a band.
FIG. 2B is a UU cross section of FIG. 2A, and is formed of eight divided heat generating portions 2 containing the heat generating composition molded body 7, and has a bending resistance of 100 mm or less in the longitudinal direction. It is the heat generating body 1 with a band which has a pair of heat generating parts.
The band 13 is formed from a stretchable nonwoven fabric. It is stuck to one end side of the adhesive layer 5 which becomes a non-stretchable region by a SIS hot melt adhesive.
Further, stretchable holding members 14 for connecting the bands 13 and 13 are provided on both sides of the eight divided heat generating portions 2. Further, four hook fasteners of hook-and-loop fasteners are provided as fixing means 17 on both sides of the band 13.

  FIG. 7C shows a band 13 of the heating element 1 shown in FIG.

  Moreover, it is preferable that the heating element of the present invention is provided with an arbitrary number of cuts such as perforations that can be cut or hand-cut alternately in an arbitrary region other than the divided heating portion.

The incision in the present invention is a through notch, and a V notch may be provided at a contact point between perforations in the periphery of the heating element, incisions such as alternate notches, and at least one side of the heating element.
Various shapes of cuts, alternate cuts, perforations (perforated perforations, etc.), V-notches, alternate cuts with V-notches, V-notched perforations (perforated perforated with V-notches, etc.), etc. Is given as an example.
Preferably, the notches in the present invention are staggered notches, staggered notches with V notches, perforations with V notches (perforated perforations with V notches, etc.), notches with V notches, and segmented heat generation of heating elements. An arbitrary number may be provided in a region other than the portion, preferably in an arbitrary portion of the dividing portion.
Preferably, a notch is formed from one side of the segmented portion to the other side corresponding to the middle of the segmented portion which is a seal portion between the adjacent segmented heat generating portions, and the expansion and contraction between the segmented heat generating units is performed by this notch. This is a heating element that enables (extension).
Preferably, a notch is formed from one side of the segmented portion to the other side corresponding to the middle of the segmented portion which is a seal portion between the adjacent segmented heat generating portions, and each segmented heat generating portion is divided by this incision ( This is a heating element that can be separated. A region having a cut is called a cut.

  As the installation location and number of the cuts, an arbitrary number can be provided in an arbitrary area other than the divided heat generating section, and the divided area is preferable as the installation area.

The shape of the notch is not limited, and for example, the planar shape can be a linear shape, a rhombus shape, a hexagonal shape, an alloy shape, an elliptical shape, a circular shape, a rectangular shape, an X shape, or the like.
Moreover, although there is no restriction | limiting of the elongation rate of the cut provided alternately, Preferably, it is 1.1 to 10 times and there is no restriction | limiting of a tensile strength, Preferably it is 3 N / 50mm or more.

The effect of cutting is as follows.
1. Heating elements with cuts arranged alternately 1) A non-stretchable (extensible) heat generating element can be made into a heat generating element with a stretchable (extensible) characteristic.
2) The bending resistance can be further reduced.
3) Staggered cuts with V-notches prevent the rise of cuts in the periphery of the heating element and can be commercialized according to the planned design, increasing the commercial value.
2 Perforated heating element or hand-cut perforated heating element 1) The bending resistance can be further reduced.
2) Since it can be separated for each divided heat generating part, it can be applied to a local area such as a pot and heated.
3) A perforated heating element that can be cut by hand determines the shape depending on which part of the body is heated by the heating element, and can be used by dividing it from perforated perforations. The shape and size can be matched. Therefore, it is extremely efficient and convenient. For example, if it is desired to warm the neck circumference, the object can be achieved without any bulkiness by dividing the neck into small elongated heat generating portions.
Further, when used in both pockets, it can be used as a small rectangular heating section, which is extremely efficient.
Furthermore, depending on the place of use, it can be used as it is with a heating element including a plurality of small heating parts. In this case, as in the case of a conventional heating element consisting of one heating element. In addition, there is no drawback that the internal raw material is biased to one side. Furthermore, in the present invention, as compared with the conventional case where a mini-sized small heating element consisting of one heating element is separately manufactured or packaged, a plurality of small divided heating elements are combined together in one large heating element. Therefore, it is only necessary to cut the portion that was cut by the conventional method without increasing the cost. Moreover, since it can package with a big heat generating body, packaging cost can also be reduced.
In addition, a heating element with a V-notched perforated perforation is easier to tear when hand-cut, so it can be cut reliably and the shape of the product after cutting is excellent in design. It will be.
Further, when the support is stretched, it can be torn easily, and a reliable stretchable (extensible) heating element can be obtained, which is excellent in design and increases the commercial value.

The hand-cut perforation has a through-cut, and the length of the notch need not be the same as the distance between the notch and the notch, and there is no limitation as long as it can be cut when hand-cut. An example is given below.
1) The perforated perforation is a circular through-cut, and the diameter thereof is preferably 10 μm to 10 mmφ, more preferably 10 μmφ to 5 mmφ, and further preferably 100 μmφ to 5 mmφ. Is 500 μmφ to 0.5 mm.
In addition, the length of the cut is preferably 10 μm to 200 mm, more preferably 10 μm to 50 mm, still more preferably 10 μm to 30 mm, still more preferably 10 μm to 20 mm, and even more preferably. It is 100 micrometers-20 micrometers, More preferably, they are 100 micrometers-10 mm.
2) The length of the interval between the through notch and the adjacent notch is not limited, but is preferably 1 μm to 10 mm, more preferably 1 μm to 7 mm, still more preferably 1 μm to 5 mm, and further Preferably they are 1 micrometer-1 mm.
3) The ratio (A / B) of the length (A) of the cut through and the shortest length (B) between adjacent cuts is preferably 1 or more, more preferably 1 to 50, still more preferably. Is 5-40, More preferably, it is 10-30.
4) The front end of the perforation has a contact point with the side of the heating element.
5) Two or more rows of perforated perforations may be provided in parallel.
6) Perforated perforated lines may be provided in a region other than the section heat generating portion with a predetermined interval in the vertical, horizontal, vertical and horizontal directions.

The length of the notch is not limited in length, longest diameter or longest side, but is preferably 1 to 100 mm, 1 to 50 mm, more preferably 1.5 to 50 mm, and still more preferably 2 It is -30 mm, More preferably, it is 5-20 mm.
The width, the shortest diameter, or the shortest side is not limited, but is preferably more than 0 and 50 mm, more preferably 0.01 to 50 mm, more preferably 0.1 to 50 mm, and still more preferably 0.00. It is 1-30 mm, More preferably, it is 0.1-20 mm, More preferably, it is 0.1-10 mm, Furthermore, this is 0.1-5 mm.
In addition, although there is no restriction | limiting in the mutual space | interval (cutting feed width, shown as W1 in FIG.7 (e)) of the extending direction of an opposing notch, Preferably it is 0.01-20 mm, More preferably, it is 0.01- It is 10 mm, More preferably, it is 0.1-8 mm, More preferably, it is 0.1-7 mm. More preferably, it is 0.1-5 mm.
Although there is no restriction | limiting in the mutual space | interval (cutting width, W2) of the direction orthogonal to the extending direction of a cut, Preferably it is 0.1-20 mm, More preferably, it is 0.1-15 mm, More preferably, it is 0.1. 10 mm, more preferably 0.1 to 5 mm, and still more preferably 0.5 to 5 mm.

  There is no limitation on the shape after stretching the alternately arranged cuts, and the size of the mesh shape after stretching the cuts is not limited. There is no restriction on the dimension (corresponding to the cutting length) in the direction of elongation (stretching direction), but preferably 1 to 100 mm, and the dimension in the direction of shrinkage (direction perpendicular to the stretching direction) is not limited, but preferably 1.5 to 50 mm.

  When a non-extensible material is used as a flexible material for a flexible holding member, a plurality of incisions penetrating in the thickness direction alternately arranged depend on the selection of the geometric shape. In particular, a rhombus pattern is preferable because the stretchability or stretchability is increased.

  Although there is no restriction | limiting in particular as an example of the arrangement | positioning means of this cutting, It can mention using an expand cutter, a rotary die cutter, pig removal, a laser, etc. When using an expand cutter, it can be easily formed into an adhesive tape or an adhesive tape with a double separator, such as a thick substrate, and when a rotary die cutter is used, continuous operation is possible. It is also possible to form a notch from the base material or the adhesive surface side.

  Here, arranging the cuts in a staggered manner means arranging the cuts so that the cuts can be deformed into a mesh or the like by stretching a packaging material of a non-stretchable material or a non-stretchable material. Unlike the processed net, the joint portion is integral, and a mesh can be formed while spreading by a certain cut length.

  When a plurality of cuts penetrating in the thickness direction arranged alternately are formed, taking a linear cut as an example, it is described in metal lath processing such as JIS-A5505. By this cutting, it is possible to expand and contract in the direction perpendicular to the longitudinal direction, and it is possible to obtain a mesh shape whose shape can be freely changed.

The flexible heating element of the present invention is preferably configured so that it can expand and contract in the direction perpendicular to the longitudinal direction of the cut, and the elongation rate is not limited, but it depends on the application, but preferably 1.1 to It is 10 times, More preferably, it is 1.2 to 10 times, More preferably, it is 1.5 to 10 times, More preferably, it is 2 to 6 times. If it is less than 1.1, the shape following property is insufficient, and if it exceeds 10 times, the opening of the mesh becomes too large and the tensile strength may be lowered. Here, the expansion ratio (times) means a quotient obtained by dividing the length after expansion by the length before expansion.
Moreover, although there is no restriction | limiting of the tensile strength of the heat generating body which has the notch | incision of this invention, Preferably it is a flexible heat generating body which is 3 N / 50mm or more.

Further, as shown in FIG. 8A, a polymer mesh stretchable material (scrim) 18 may be used as the stretchable material. The scrim 18 is sandwiched and coupled between the bands 13 as shown in FIG.
In this example, a low-density polyethylene heat seal layer / polyethylene film is used as the base material, and a polyethylene porous film / polyethylene film is used as the base material.
A heat seal layer / polyethylene film made of polyethylene-vinyl acetate may be used as the base material, and a heat seal layer / polyethylene film made of low density polyethylene perforated in the covering material may be used.
The mesh stretchable material (scrim) 18 has a plurality of first strands intersecting with the plurality of stretchable second strands, and is integrally coupled to the band 13.
The mesh stretchable material (scrim) 17 may be disposed on the opposite side of the segmented heat generating unit 2 in FIG. 8A or may be provided on both sides.

Fig.9 (a) shows the top view of the heat generating body 1 for foot temperature which has the shape of a full foot. The base material is a laminate of anti-slip layer / core material / polyethylene layer, and the coating material is a non-woven fabric made of porous film nylon.
Examples of the core material include plastic films and sheets, rubber, corrugated liner paper, corrugated core (paper), thick paper such as coated balls, and rigid paper. The installation method may be independent, but rubber that serves as an anti-slip layer and a core material may be used, or the same material as that of the base material or the covering material may be used. In addition, what is necessary is just to select rigidity suitably with the site | part of the applied foot.

  FIG. 9 (b) shows that the divided heat generating part 2 is formed so as to be divided at the substantially central part of the heating element 1 for foot temperature, and the perforation 16 is put in the substantially central part of the divided part 3 without the exothermic composition molded body. This is a foldable heating element 1 for foot temperature. When the foot temperature heating element 1 is folded and stored in the outer bag, the foot heating element 1 becomes small and easy to carry, and also prevents water from scattering and saves the outer bag.

  In this case, the shape of the exothermic composition molded body 7 only needs to be formed in a shape that covers any part of the foot, for example, a shape that covers a part of the back side of the foot, a shape that covers the entire back side of the foot, A shape that covers a part of the instep side of the foot, a shape that covers the entire side of the back of the foot, a shape that covers a part or all of the back side or the instep side, and a part or all of the side of the foot, or Examples thereof include a shape that covers a part or all of the back side of the foot, a part or all of the side of the foot, and a part or all of the back side of the foot. Moreover, a recessed part etc. may exist in the center part etc. of a heat-generating composition molded object. In the present invention, the exothermic composition compact which is a compressed exothermic composition compact is also included in the exothermic composition compact.

FIG. 10A is a plan view showing another example of the heat generating element 1 that can be expanded and contracted. FIG. 2B shows a cross-sectional view of R-R.
The illustrated heating element 1 is a rectangular heating element 1 having a length of 135 mm and a width of 100 mm.
The divided heat generating portion 2 contains a heat generating composition molded body 7 having a height of 1.7 mm. Moreover, the width | variety of the division part 3 which is a heat seal part is 5 mm. Further, the seal width of the outer peripheral portion is 8 mm.
A perforation 16 that can be cut by hand until the peripheral edge of the heating element 1 is reached is provided at the center of each section 3.
The heating element 1 is attached to a support 19 made of a thermoplastic polyester elastomer film having a stretchability of 50 μm with a SIS hot melt adhesive 28 interposed therebetween. In addition, as the support body 19, the elastic packaging material which comprises the band 13 used with the said band warmer is also useful.
Further, the support 19 is provided with a pressure-sensitive adhesive layer 29 made of an acrylic pressure-sensitive adhesive having a thickness of about 30 μm and protected by the separator 6.
When the heating element 1 is stretched, the section heating elements 2 are cut off at the perforation 16 so that the heating element 1 can be extended. FIG. 10C shows an RR cross-sectional view when the heating element 1 is extended.

  Note that the perforations may be included in all of the sorting sections. Also, a V notch can be provided at the end of the perforation.

Further, the perforation may be as follows.
1) It is formed by drilling with a diameter of 10 μm to 1200 μmφ or a cut with a length of 10 μm to 200 mm.
2) It is installed side by side with a predetermined interval vertically and horizontally.
3) The shortest interval between the outer peripheries of adjacent holes or the shortest interval of the perforations 18 on a line connecting the centers of adjacent holes of the perforation 18 is 1 μm to 5000 μm.

Fig.11 (a) is an example of the other heat generating body which provided the ventilation adjustment material. 11B, the base material 4 is formed by laminating a non-breathable polyethylene film with a polyethylene non-woven fabric, and the separator 11 is provided on one side with an adhesive 14 therebetween. On this base material 4, the exothermic composition molded object 7 which consists of a moldable surplus water exothermic composition is laminated | stacked, and the breathable coating | covering material 8 which laminated the polypropylene nonwoven fabric on the polyethylene porous film on it. Covering and heat-sealing the peripheral edge of the exothermic composition molded body 7 form the eight divided heat generating portions 2. Next, the air flow adjusting material 20 is attached with an adhesive on the upper surface of the divided heat generating part 2 and the outer peripheral part of the heat generating element 1.
A space ventilation layer 21 is substantially formed between the ventilation adjusting member 20 and the partitioning portion 3, and air is taken in from the openings at both ends.

FIG. 11C is an enlarged view of the vicinity of the space ventilation layer 21, and is an example in which one space ventilation layer is provided in the section 3.
FIG. 11 (d) shows the air conditioning material 20 attached to the substantially central portion of the section 3 between the adjacent section heat generating sections.

FIG. 11 (e) shows a modification, in which a ventilation hole 22 is provided at a position corresponding to the section 3 of the ventilation adjusting material 20, from which air is taken in.
Note that a ventilation blocking sheet may be detachably bonded to the ventilation hole 22. As a result, air (oxygen) does not enter the inside of the divided heat generating portion from the ventilation surface during storage and transportation, and heat generation during storage and transportation can be prevented.

In the present invention, the air flow adjusting material is formed by covering the section heat generating portion with the air flow adjusting material, thereby forming a space in at least a part of the peripheral edge of the section heat generating portion, and providing air permeability between the outside and the section heat generating portion. Adjust and give warmth effect. Further, if the divided heat generating portions are scattered, surface heat generation can be realized in a practical range.
The air conditioning material and the support can be a packaging material used for a base material or a covering material, and any packaging that has been disclosed in the past, is commercially available, or is used for a known disposable body warmer or heating element. It can be used by appropriately selecting from materials.

The air permeability of the air flow adjusting material is not limited as long as it is lower than the air permeability of the heat generating portion provided with the air flow adjusting material or the ventilation surface of the heat generating body.
The breathability, moisture permeability by Risshi method, preferably not more than ^50g / m 2 / 24hr, more preferably not more than ^10g / m 2 / 24hr, more preferably not more than ^2g / m ² / 24hr, even more preferably not more than ^1g / m 2 / 24hr, it may also be used those commonly referred to as non-breathable material.
Examples include a porous film, a nonwoven fabric, a breathable material such as a film or sheet having holes by perforation, and a composite such as a laminate including at least one of them as part of constituent members. Particularly preferred are films, sheets and composites provided with holes by perforation.
In addition, in the local area of the ventilation adjusting material, a region (ventilation hole) having a larger air permeability than the ventilation surface (ventilation hole) of the heating element is provided in the local region of the ventilation adjusting material to increase the local air permeability, and other regions May be made substantially non-breathable, or may be kept lower in breathability than the breathability of the vent surface of the section heat generating portion, and the flow path and flow of gas such as air may be controlled. Thereby, the heat insulation of a division | segmentation heat-emitting part and appropriate temperature maintenance can be performed.

  The air conditioning material is not limited as long as it is a plastic film or sheet having a non-breathable region and a breathable region. However, the material constituting the air conditioning material is conventionally a heating element or a chemical warmer (breathable storage bag (inside Material) used in the bag) and non-breathable storage bag (outer bag)) and the base material, covering material, and material used in the outer bag described in the specification of the present invention can be used, and may be appropriately selected. . Non-breathable films, sheets, and laminates containing them, films, sheets and laminates comprising vents provided by perforation are useful. For example, a plastic film or sheet having vent holes by perforation obtained by perforating a non-breathable plastic film or sheet can be given as an example. According to this method, the air permeability can be adjusted relatively easily by adjusting the size of the needle hole. Also, if a plastic film or sheet with a smooth outer surface is used, when the vent hole is covered with another non-breathable plastic film or sheet, the plastic film or sheet should be tightly bonded to the periphery of the vent hole. Can do.

For example, polyethylene, polypropylene, vinyl chloride, polyvinylidene chloride, polyethylene terephthalate and other plastic materials such as nylon, films of various plastic materials such as nylon, KOP (vinylidene chloride coated biaxially oriented polypropylene film), etc., K coat (vinylidene chloride coated) film, vapor deposition Single layers such as films (films with deposited metal compounds such as silicon oxide, aluminum oxide, silicon nitride, aluminum nitride, silicon oxynitride, etc. or metal compounds such as aluminum), non-woven fabric and various film laminates Or the laminated film and sheet | seat containing these are mentioned as an example.
Furthermore, PE / adhesive, PP / adhesive, PET / adhesive, PE / nonwoven fabric / breathable adhesive PE / nonwoven fabric / PE / adhesive, PE / PET / M / PE / nonwoven fabric / breathable adhesive, PE Examples include: / heat seal material, PE / nonwoven fabric / heat seal material PE / nonwoven fabric / PE / heat seal material, PE / PET / M / PE / nonwoven fabric / heat seal material, and the like.
Here, PE represents polyethylene, PET represents polyethylene terephthalate, M represents a metal such as aluminum or silver, or a semiconductor such as silicon oxide, silicon oxynitride, silicon nitride, or aluminum oxide, or an oxide of metal, oxynitride, or nitride. It is a metal compound. Moreover, there is no restriction | limiting in the installation part of fixing means, such as an adhesive layer and a heat seal agent layer, and what is necessary is just to use properly suitably whether it provides in part or the whole surface.

The ventilation holes of the air conditioning material can be provided on the entire surface, the holes can be pierced centrally in the air conditioning material, the belt can be provided endlessly in the center of the air conditioning material, Examples of the method are provided at the end, and any of them can be applied.
Further, when the vent hole is completely covered with a plastic film, the central portion concentration method is preferable. In the case of a heating element in which a hole perforated by a conventional heating element is made into a ventilation hole and completely covered with a plastic film, leakage of contents during use becomes a problem. This problem can be avoided because a double cover structure is used in which the portion and the air flow adjusting material are combined. In particular, it is more preferable when the ventilation portion of the section heating portion has a porous film as a member. According to the present invention, even when an exothermic composition containing no excipient is used, the problem of external contamination due to leakage of contents during use can be avoided.

  There is no limitation as long as the adhesive layer that fixes the air flow adjusting material to the heat generating portion and / or the heat generating body can be fixed. Examples of constituents of the adhesive layer include adhesives described in the specification of the present invention, adhesives such as acrylonitrile adhesives, heat seal materials, and the like.

There is no limitation as long as the fixing region of the ventilation adjustment material and the heat generating part can be fixed at least at the outermost peripheral edge of the heat generating element,
1) Fix the heat generating part or the heat generating element only at the outermost peripheral edge end of the entire periphery.
2) Let the other outermost peripheral edge part which left substantially the whole center part of a pair of outermost peripheral edge part of a pair of heat generating part or a heating element which is opposite as a fixed frame area,
3) In addition to 1) or 2), furthermore, the substantially top part of each section heat generating part and the substantially center part of each section part are used as fixed areas.
4) In addition to 1) or 2), a space is provided in substantially the entire central portion of the heat generating portion, and a substantially central portion of each of the other divided heat generating portions and a central portion of each of the other divided portions is used as a fixed region.
5) In addition to 1) or 2), the top of each section heating part is a fixed region.
It is preferable.

The adhesive layer for fixing the ventilation block sheet is composed of a commonly used adhesive or pressure-sensitive adhesive. In particular, the pressure-sensitive adhesive is useful, and the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer can be used.
Further, the method for providing the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer composed of the pressure-sensitive adhesive, and the adhesive layer is not limited as long as the air-permeable blocking sheet can be fixed. Alternatively, it may be provided partially or intermittently. Various shapes such as a net shape, a stripe shape, a dot shape, and a belt shape are listed as examples. In particular, those provided in a net shape (spider web) by the melt blow method are useful.

  The air-blocking sheet is detachably bonded. As this method, for example, a slight pressure-sensitive adhesive is applied to the entire surface of the upper air-blocking sheet, or it is applied in a streaky coating or a spot shape and partially applied to bond the air-blocking sheet. Alternatively, a method of laminating with a breathable sheet by laminating is employed. In addition, when forming an adhesive layer in the whole breathable sheet, it is necessary to ensure the breathability of the breathable sheet after peeling. For this purpose, it is preferable to subject the airflow shielding sheet to electrical discharge machining such as corona treatment or anchoring treatment so as to increase the anchoring force with the airflow shielding sheet so as not to leave as much adhesive as possible on the airflow shielding sheet.

  By adhering the air blocking sheet to the air flow surface (breathable sheet) of the air flow adjusting material in such a way that it can be peeled off, air (oxygen) enters the inside of the heat generating section from the air flow surface during storage and transportation. This prevents heat generation during storage and transportation. On the other hand, since air permeability can be ensured by peeling the air-blocking sheet from the air-conditioning material at the time of use, heat can be generated by normal use. Therefore, it becomes possible to ship without individually packaging each heating element as in the past, and several heating elements can be packaged together in one packaging bag, so-called inner bags can be omitted. . In other words, even if one of them is used when packaged together, it can be stored in the same way as each individual heating element 1 is packaged individually, and the storage state such as sealing after opening is not taken care of. Can be used for

  In the heating element of the present invention, it is also possible to form a storage bag (partition heating part) with a breathable material and a non-breathable material in advance and provide a ventilation adjusting material, and then attach a ventilation blocking sheet. In the process, first, a breathable sheet and a ventilation blocking sheet are laminated to prepare a composite sheet in advance, and then the composite sheet and the non-breathable sheet are bonded together to form a heating element provided with the ventilation blocking sheet. It may be produced.

  Further, the ventilation blocking sheet needs to cover the entire ventilation surface, but does not necessarily need to cover the entire ventilation side surface of the ventilation adjusting material, and is preferably set to be slightly smaller than the peripheral edge thereof. More preferably, the ventilation blocking sheet is easily peeled off by covering the periphery of the ventilation hole of the ventilation adjusting material.

The ventilation blocking sheet only needs to block the ventilation of the ventilation surface during storage and transportation and prevent air from entering, and does not necessarily require the ventilation blocking.
For example, a sheet-like material obtained by laminating paper, an aluminum thin film, or the like with these plastic films is used for the ventilation block sheet, in addition to the material used for the ventilation adjusting material and the same plastic film. Further, unlike the non-breathable sheet, it is not required to have heat resistance because it is peeled off at the time of use, and may be hard rather than soft. In addition, since it is only necessary to prevent the exothermic reaction of the exothermic composition, it is not necessary to completely block air, but an oxygen-blocking sheet with low oxygen permeability, which is one of the heat generation sources of the exothermic composition, may be used. it can.
A method for manufacturing a heating element having a minimum bending resistance of 100 mm or less on a surface orthogonal to the thickness direction of the heating element is useful as a method for manufacturing a heating element excellent in fit. In particular, a heating element having a pleated heating part that has a remarkably small bending resistance in one direction with respect to the other direction is a heating element having excellent fit.
All the materials relating to the heating element such as the heat generating composition and the packaging material are as described above, and using them, this manufacturing method is used to manufacture all the heating elements.

The mold forming method uses a mold having a mold hole composed of a recess or a through hole, fills the mold hole with a moldable excess water exothermic composition, and releases the mold to obtain a heat generating composition molded body. Examples thereof include a die-through molding method and a cast molding method.
Laminate exothermic composition moldings or a plurality of exothermic composition moldings obtained by molding a moldable water-containing exothermic composition by mold molding methods such as a mold-through molding method and a casting molding method on a substrate at intervals. To do.
Furthermore, it covers with a covering material and seals the peripheral part of the exothermic composition molded body to provide a heat generating part or a section heat generating part. The peripheral edge of the heat generating part is sealed (such as a pressure-bonding seal, a thermocompression-bonding seal, or a heat seal). The divided heat generating parts are composed of a plurality of parts, and the divided heat generating parts are arranged apart from each other by a dividing part which is a heat seal part, and a heat generating part is formed from a set of the divided heat generating parts. The periphery of the heating element is sealed (such as a pressure-bonding seal, a thermocompression-bonding seal, or a heat seal). Heat sealing is particularly preferable.
Next, a heating element is manufactured through a cutting process or the like. The sealing step, the cutting step, etc. may be used by appropriately selecting from conventional methods and apparatuses.

  Moreover, you may use a magnet for the manufacturing method and manufacturing apparatus of the exothermic composition molded object of this invention. When the magnet is used, the exothermic composition can be easily housed in the mold and the exothermic composition molded body can be easily detached from the mold, and the exothermic composition molded body can be more easily molded.

The die-through molding method is a method for producing a heat-generating composition molded body by using a punching die, molding a heat-generating composition, laminating a die-shaped heat-generating composition molded body on a base material. is there.
The punching die is a die having a through hole having a desired shape and thickness. As a continuous manufacturing device, a drum-shaped forming device in which a plurality of through-holes are provided on a rotating surface of a hollow drum-like rotating body or a strut-conveyor-type rotation in which a plurality of struts having one or more through holes are provided An example is a strut-conveying device using a body.
As a continuous manufacturing method, a molding machine using the above-described rotary punching die and laminating a heat generating composition molded body having a punched die shape on a long base material and a long covering thereof Using a rotary sealer that covers the material and seals the target section and the periphery of the base material and the covering material (heat seal, pressure seal, thermocompression seal, etc.), and heat generation composition through the seal An example is a continuous forming method in which the necessary portions of the peripheral part and the divided part of the molded article are heat sealed and sealed.

The casting molding method is a method for producing a heat-generating composition molded body by filling a heat-generating composition into a casting mold having a recess and laminating the molded heat-generating composition molded body on a substrate. The punching die is a die having a recess having a desired shape and thickness. As an example of the continuous production apparatus, an exothermic composition molded body production apparatus in which a plurality of recesses are provided on the outer surface of a drum-shaped rotating body or a hollow drum-shaped rotating body can be given as an example.
As a continuous production method, the exothermic composition molded body is placed on a long base material by filling the concave portion of the exothermic composition molded body manufacturing apparatus comprising the drum-shaped rotating body having a plurality of concave portions and transferring it to the base material. A rotary sealer that covers the molding machine to be laminated and a long covering material, and seals the target section and the periphery of the base material and the covering material (heat seal, pressure seal, thermocompression seal, etc.) An example is a continuous forming method in which the necessary portions of the twill portion and the sectioned portion of the exothermic composition molded body are heat-sealed through the sealer and sealed.

In the present invention, the easy water value is a value indicating the amount of surplus water that can move out of the exothermic composition in the water present in the exothermic composition.
No. with 8 lines written at 45 degree intervals radially from the center point under normal temperature and normal pressure. 2 (JIS P3801 type 2) filter paper is placed on a stainless steel plate, and a template of length 150 mm × width 100 mm having a hollow cylindrical hole with an inner diameter of 20 mm × height of 8 mm is placed at the center of the filter paper. Place the sample in the vicinity of the hollow cylindrical hole, move the push plate along the mold plate, put the sample into the hollow cylindrical hole while pushing the sample, and scrape the sample along the mold plate surface (mold push molding) .
Next, in order to prevent an exothermic reaction during the measurement, a non-water-absorbing 70 μm polyethylene film is placed so as to cover the hole, and further, a thickness of 5 mm × length of 150 mm × width of 150 mm is placed thereon. Place a stainless steel flat plate and hold at room temperature and normal pressure for 5 minutes). Thereafter, the filter paper is taken out, and the trace of water or aqueous solution soaking is read in millimeters as the distance from the circumference that is the edge of the hole of the hollow cylinder to the tip of the soaking, along the radial line. Similarly, the distance is read from each line to obtain a total of eight values. Each of the eight values read (a, b, c, d, e, f, g, h) is taken as a measured moisture value. The arithmetic average of the eight measured moisture values is taken as the moisture value (mm) of the sample. In addition, the water content for measuring the true water value is the blended water content of the exothermic composition or the like corresponding to the weight of the exothermic composition or the like having an inner diameter of 20 mm × height of 8 mm, and only water corresponding to the water content is used. Measured in the same manner, and calculated in the same manner as the true water value (mm). The value obtained by dividing the moisture value by the true moisture value and multiplying by 100 is the easy water value. That is,
Easy water value = [moisture value (mm) / true water value (mm)] × 100
Five points are measured for the same sample, the five ready water values are averaged, and the average value is taken as the ready water value of the sample. In addition, when measuring the mobile water value of the exothermic composition in the heating element, the moisture content for measuring the true moisture value is calculated by calculating the moisture content of the exothermic composition from the moisture content measurement using an infrared moisture meter of the exothermic composition. Based on this, the amount of water necessary for the measurement is calculated, and the true water value is measured and calculated from the amount of water.
In addition, at least the exothermic composition having an easy water value of 0.01 or more and less than 14, particularly 0.01 to 13.5, has a non-water-absorbing 70 μm polyethylene film 12 placed so as to cover the hole, If a windshield is placed instead of the stainless steel plate 11 having a thickness of 5 mm, a length of 150 mm, and a width of 150 mm, the exothermic composition of the present invention undergoes an exothermic reaction during the measurement, making the measurement impossible.

The degree of molding refers to the shape of the exothermic composition molded body, which is a molded body of the exothermic composition in the shape of the punched hole by mold-through molding using a punching die having a punched hole, after being separated from the mold. Maintaining the peripheral portion of the exothermic composition molded body without the collapsed pieces of the exothermic composition molded body having a maximum length exceeding 800 μm, and depending on the number of collapsed pieces of the exothermic composition molded body having a maximum length of 300 μm to 800 μm. The moldability of the exothermic composition is quantified.
1) As a measuring device,
On the upper side of the endless belt that can run, a stainless steel mold (in the center, four corners of length 60mm x width 40mm are rounded to 5 are r (substantially arc shape), and the upper part of the punched hole (heat generating composition inlet) The corners of the four sides of this are provided with 1 radius r (substantially arc shape), and the corners of the four sides of the lower part of the punch hole (exit of the exothermic composition molded body) are provided with 3 radius r (substantially arc shape). A plate with a thickness of 2 mm × length 200 mm × width 200 mm, which has a hole and a smooth surface on the outer surface of the mold and each wall of the punch hole, and a wearable plate that can be fixed are placed, and the endless on the opposite side A magnet (thickness 12.5 mm × length 24 mm × width 24 mm, two magnets in parallel) is arranged on the lower side of the belt. The smooth surface is not limited as long as it is smooth, but the surface roughness Ra is preferably 10 μm or less, more preferably 4 μm or less, and even more preferably 2 μm or less.
The magnet covers an area larger than the area (40 mm) of the maximum cross section with respect to the direction of travel of the punching hole of the mold, and the area in the vicinity thereof.
2) As a measurement method,
A stainless steel plate having a thickness of 1 mm × length of 200 mm × width of 200 mm is placed on an endless belt of the measuring device, a polyethylene film of thickness of 70 μm × length of 200 mm × width of 200 mm is placed thereon, and a stainless steel mold is further formed thereon. Put.
Then, after fixing the scraping plate at a position of 50 mm from the advancing side end of the endless belt of the punching hole of the mold, 50 g of the exothermic composition is placed near the scraping plate between the scraping plate and the punching hole, The belt is moved at 1.8 m / min to fill the punching hole of the mold while scraping off the exothermic composition. After the mold has completely passed through the scraping plate, the running of the endless belt is stopped.
Next, the stainless steel mold 23 / heat generating composition molded body 7 / polyethylene film 24 / stainless steel plate 25 are set in the molding degree measuring apparatus shown in FIG. The mold holding means 26 is set on the lower side of the stainless steel mold 23, and the jack 27 is lowered by 100 mm at a speed of 600 mm / mim (FIG. 12B), and the exothermic composition molded body 7 / polyethylene film 24 / stainless steel. The plate 25 is removed from the stainless steel mold 23. Gently remove the stainless steel mold 23 from the mold holding means 26 and observe the exothermic composition molded body 4 / polyethylene film 24 / stainless plate 25 laminated on the polyethylene film 24 to determine the degree of molding. taking measurement.
FIG. 12C is a plan view with a forming degree of 10, and FIG. 12D is a cross-sectional view of NN.
FIG. 12E is a plan view of a forming degree 4 in which there are six pieces 39 of the exothermic composition molded body, and FIG. 12F is a cross-sectional view taken along the line PP.
3) As a judgment method,
On the condition that there is no collapsed piece of the exothermic composition molded body having a maximum length exceeding 800 μm at the peripheral portion of the exothermic composition molded body, a forming degree of 1 means a exothermic composition having a maximum length of 300 μm to 800 μm. There are 9 or more pieces of the molded body.
A moldability of 2 means that there are eight pieces of the exothermic composition molded body having a maximum length of 300 μm to 800 μm.
When the degree of molding is 3, there are seven pieces of the exothermic composition molded body having a maximum length of 300 μm to 800 μm.
A forming degree of 4 means that there are six pieces of the exothermic composition molded body having a maximum length of 300 μm to 800 μm.
A molding degree of 5 means that there are five pieces of the exothermic composition molded body having a maximum length of 300 μm to 800 μm.
A forming degree of 6 means that there are four pieces of collapsed pieces of the exothermic composition molded body having a maximum length of 300 μm to 800 μm.
A moldability of 7 means that there are three pieces of the exothermic composition molded body having a maximum length of 300 μm to 800 μm.
A forming degree of 8 means that there are two pieces of the exothermic composition molded body having a maximum length of 300 μm to 800 μm.
A forming degree of 9 means that there is one broken piece of the exothermic composition molded body having a maximum length of 300 μm to 800 μm.
A forming degree of 10 means that there are 0 pieces of collapsed pieces of the exothermic composition molded body having a maximum length of 300 μm to 800 μm.
The molding degree is preferably 7 or more, more preferably 8 or more, still more preferably 9 or more, and still more preferably 10.
The forming degree is 5 or more.
If the molding degree is 5 or more, a seal that can withstand practical use is provided at the peripheral edge of the exothermic composition molded body sandwiched between the base material and the coating material after molding.
In the case of the exothermic composition having a forming degree equal to or higher than the standard, the exothermic composition molded body can be produced by a mold forming method such as die-through molding or cast molding.
If there is a molding degree exceeding the standard, the exothermic composition molded body is covered with at least the covering material, and the shape is maintained until the seal portion is formed between the base material and the covering material. Sealing can be performed at the portion, and so-called sesame, which is a broken piece of the heat generating composition, is not scattered at the sealing portion. The presence of sesame causes poor sealing.
In the present invention pursuing high moldability, the exothermic composition is assumed to have moldability when the degree of molding is 7 or more.
This is an essential property for the exothermic composition used in the molding method. Without this, it is impossible to manufacture a heating element by a molding method.

The exothermic composition of the present invention has compression resistance. Here, the compression resistance is the exothermic composition having a thickness of 70% of the mold thickness by compressing the exothermic composition molded body contained in the mold. The composition compact retains an exothermic rise of 80% or more of the exothermic rise of the exothermic composition molded body before compression (temperature difference between 1 minute and 3 minutes after the start of the exothermic test of the exothermic composition). It is to be.
Here, a method for measuring the heat build-up property for compression resistance will be described.
1. Exothermic composition molded body 1) A magnet is provided in the vicinity of the center of the back surface of a vinyl chloride support plate (thickness 5 mm x length 600 mm x width 600 mm) of a legged support so as to cover the shape of the punched hole of the mold.
2) Place the temperature sensor on the center of the surface of the support plate.
3) A polyethylene film with a thickness of 25 μm × length 250 mm × width 200 mm with an adhesive layer having a thickness of about 80 μm is attached to the support plate via the adhesive layer so that the center of the polyethylene film comes to the sensor. (The thickness of the adhesive layer may be changed if the polyethylene film can be fixed)
4) A length of 280 mm × width 150 mm × thickness 50 μm to 2 mm on a base plate 230 mm long × width 155 mm × thickness 25 μm to 100 μm Polyethylene is installed so that one end is substantially coincident with one end of the floorboard.
5) A template having a length of 230 mm, a width of 120 mm and a thickness of 3 mm having a punched hole of length 80 mm × width 50 mm × height 3 mm is placed on the polyethylene film on the floor plate. In that case, one end in the length direction of the template is aligned with one end where the base plate and the polyethylene film are aligned, and in the width direction, the end opposite to the side where the polyethylene film protrudes outside the base plate Further, the template is placed on the polyethylene film so that one end of the width of the template comes to the center of about 20 mm. Next, it is placed on the support plate together with the floor plate.
6) Place the sample in the vicinity of the punched hole, move the push plate along the template, put the sample into the punched hole while pushing the sample, and scrape it while pushing the sample along the die plate surface (mold push molding), mold Fill sample inside.
7) Except the magnet under the support plate, press the end of the protruding polyethylene film, remove the floor plate, and start temperature measurement.
2. Exothermic composition compression bodies 1) to 6) are the same as in the case of the exothermic composition molded body.
8) Because of the relationship between the punched hole and the unevenness, fit a punching die with a thickness of 0.9 mm that fits into the punched hole, and compress it with a roll press or plate press. Then, a heat generating composition compressed body having a thickness of 2.1 mm is prepared in the mold (compressed to 70% of the mold thickness).
9) Place on the support plate together with the laying plate, remove the magnet under the supporting plate, further press the end of the protruding polyethylene film, remove the laying plate, and start temperature measurement.
The exothermic temperature is measured by using a data collector, measuring the temperature for 2 minutes at a measurement timing of 2 seconds, and determining the compression resistance based on the temperature difference between 1 minute and 3 minutes later.
The thickness after compression is preferably 50 to 99.5% of the mold thickness, more preferably 60 to 99.5%, still more preferably 60 to 95%.
In the present invention, the exothermic composition molded body includes a exothermic composition compressed body.

  Moreover, the perforation of the division part of a heat generating body contains what was cut | disconnected intermittently in order to improve the bendability of a division part, and what was cut | disconnected intermittently so that hand cutting was possible. This perforation may be provided in all the division parts, or may be provided partially.

In the present invention, the bending resistance indicates rigidity (harness, stiffness) or flexibility, and conforms to the JIS L 1096A method (45 ° cantilever method) except that the heating element itself is used as a sample. Is. That is, one side of the heating element is placed on the scale base line on a smooth horizontal base having a slope of 45 ° (degrees) at one end. Next, the heating element is slid gently in the direction of the slope by an appropriate method, and when the central point of one end of the heating element contacts the slope, the position of the other end is read on the scale. The bending resistance is indicated by the length (mm) that the heating element has moved. Each of the five heating elements is measured and an average value is obtained.
However, the heat generating part containing the heat generating composition of the heat generating element must have a moving direction distance of 5 mm or more and a distance in the direction perpendicular to the moving direction of 20 mm or more on the horizontal table. In addition, the length of the heating element placed on the horizontal table is such that it crosses the region where the exothermic composition exists or the region where the exothermic composition exists and the region where it does not exist. Crossing.
1) Method for measuring and calculating the bending resistance of a heating element having an adhesive layer (1) The surface of the heating element that does not have an adhesive layer is placed on a horizontal table and measured.
(2) When the side of the heating element having the adhesive layer corresponds to the side of the horizontal base,
A separator is attached to the pressure-sensitive adhesive layer, and the surface on the pressure-sensitive adhesive layer side with the separator is placed on a horizontal table for measurement.
(3) The separator covering the pressure-sensitive adhesive layer of the heating element with the pressure-sensitive adhesive layer is a plastic film having a bending resistance of 30 mm or less, or a plastic film having a thickness of 50 μm or less, preferably 25 μm or less. Use a soft, soft film such as a plastic film that can be wrinkled.
2) Measurement calculation method of minimum bending resistance.
For one heating element, one surface is placed on a horizontal base, and the bending resistance in each direction is obtained with an average value in the vertical direction and the horizontal direction, or in one direction and the direction perpendicular thereto.
Further, another surface is placed on a horizontal table, and the same measurement is performed to obtain the respective bending resistance. The smallest value of the bending resistance is set as the minimum bending resistance.
3) As for the bending resistance of the packaging material such as the base material and the covering material, a short 100 mm × longitudinal 200 mm test piece is prepared, and the bending resistance in the longitudinal direction (200 mm direction) is adopted.

The change in the minimum bending resistance of the heating element or heating part in the present invention means that the minimum bending resistance, which is the smallest value among the bending resistances of the heating element or heating part, is the value before and after the heating element is heated. The change in value that occurs at.
The change in the minimum bending resistance is calculated by the following equation.
Change in minimum bending resistance (%) = | ((A−B) / A) × 100 |
A: Minimum bending resistance of heating element before heat generation B: Minimum bending resistance of heating element after heat generation 1) The obtained heating element is left in air in a 20 ° C. environment without wind, When the temperature of the heating element is lower than 25 ° C., the use is finished, and the bending resistance of the heating element with respect to the direction indicating the minimum bending resistance of the heating element before heating is measured. The minimum bending resistance of the heating element after the heat generation is finished.
2) The measurement direction of the minimum bending resistance of the heating element before heat generation and the measurement direction of the minimum bending resistance of the heating element after completion of heating are the same measurement direction.
3) Ignore heat generation during the measurement of bending resistance of the heating element before heat generation.

The minimum bending resistance of the heating element or heating part in the present invention is the minimum bending resistance of the heating element or heating part and the bending resistance ratio with respect to the total length in the direction, and is calculated by the following equation.
Minimum bending resistance = (A / B) × 100
A: Minimum bending resistance of heating element or heating part B: Total length of heating element or heating part in the direction showing the minimum bending resistance

In the present invention, the minimum orthogonal bending resistance of the heating element or heating part is the ratio of the bending resistance in the direction perpendicular to the direction showing the minimum bending resistance of the heating element or heating part and the bending resistance to the total length in that direction. Yes, calculated by the following formula.
Minimum orthogonal bending resistance = (C / D) × 100
C: Stiffness in a direction perpendicular to the direction showing the minimum bending resistance of the heating element or heating part D: Total length of the heating element or the heating part in a direction perpendicular to the direction showing the minimum bending resistance of the heating element or the heating part When the minimum orthogonal bending resistance ratio exceeds 80, the minimum orthogonal bending resistance ratio is set to 100.

The minimum bending resistance ratio in the present invention refers to the minimum bending resistance ratio in the surface orthogonal to the thickness direction of the heating element or heating portion, and the minimum bending rigidity ratio in the direction orthogonal to the minimum bending resistance ratio. It is the ratio of the minimum bending resistance to the degree and is calculated from the following equation.
Minimum bending resistance ratio = (F / G) × 100
F: Minimum bending resistance ratio G: Minimum orthogonal bending resistance ratio

  When obtaining any change in stiffness, stiffness rate, stiffness rate ratio, or orthogonal stiffness rate, change in minimum stiffness, minimum stiffness rate, minimum stiffness rate ratio, minimum orthogonal stiffness rate In the description of each item, the “minimum” character may be removed.

  The minimum bending resistance of the double-sided uneven heating element having a plurality of section heating parts of the present invention is usually 100 mm or less, preferably 1 to 100 mm, more preferably 1 to 80 mm, and still more preferably 1. It is -50 mm, More preferably, it is 5-50 mm, More preferably, it is 5-40 mm, More preferably, it is 5-30 mm, More preferably, it is 5-20 mm.

  The minimum bending resistance ratio of the double-sided uneven heating element having a plurality of section heating parts of the present invention is usually 60 or less, preferably 1 to 60, more preferably 1 to 50, and still more preferably. Is 1-40, More preferably, it is 1-30, More preferably, it is 1-20, More preferably, it is 1-10.

  The minimum bending resistance ratio of the double-sided uneven heating element having a plurality of segment heating parts of the present invention is usually 100 or less, preferably 1 to 100, more preferably 2 to 100, Preferably it is 2-90, More preferably, it is 2-70, More preferably, it is 2-60, More preferably, it is 2-50, More preferably, it is 2-40, More preferably, it is 2-30 It is.

  The change in the minimum bending resistance before and after heat generation of the double-sided uneven heating element having a plurality of section heating portions of the present invention, that is, the value before the heat generation of the minimum bending resistance of the double-sided uneven heating element of the present invention. The absolute value of the change in value after the end of heat generation is usually 30% or less, preferably 0 to 30%, more preferably 0 to 20%, still more preferably 0 to 10%, still more preferably. Is 0 to 5%, more preferably 0%.

In the case of a heating element having segmented heating parts provided in stripes at intervals in the present invention, a parallel hexahedron shaped segmented heating part that maximizes the absolute value of the difference in bending resistance in two directions perpendicular to each other. A heating element provided with streaks spaced apart, a heating element provided with a pressure-sensitive adhesive layer, and a heating element provided with the adhesive layers spaced apart in a streak form are very Since it is flexible and rigid in one direction, it exhibits effects such as relieving symptoms such as stiff shoulders, low back pain, and muscle fatigue, and particularly relieving symptoms of menstrual pain. Furthermore, it can be wound in the width direction of the heating element with a size of almost the width dimension, is compact, and is convenient for storage. In the case with a separator, the separator can be wound by using a separator having low bending resistance.
When a heating element is provided along the body, the body has many secondary curved surfaces, and the shoulders, legs, abdomen, waist, arms, etc. are almost linear in one direction, and the other two directions are Made almost from a curved surface. Therefore, the heating element of the present invention, which can form a curved surface in one direction, and can be curved in the other two directions, can form a two-dimensional curved surface. Ideal for alleviating and treating symptoms.

The agglomeration aid is an agglomeration aid described in Japanese Patent No. 3161605 (Japanese Patent Publication No. 11-508314), such as gelatin, natural gum, corn syrup and the like.
The aggregating agent is an aggregating agent described in JP-T-2002-514104, such as corn syrup and maltitol syrup.
The agglomeration aid is an agglomeration aid described in JP-T-2001-507593, such as corn syrup.
The dry binder is a dry binder described in JP-T-2002-514104. Microcrystalline cellulose, maltodextrin and the like are a mixture thereof.
The dry binder is a dry binder described in JP-T-2001-507593, and includes maltodextrin, sprayed lactose, and the like.
The dry binder is a dry binder described in JP-T-11-508314, and is microcrystalline cellulose, maltodextrin, or a mixture thereof.
The adhesive material or binder is an adhesive material or binder described in Japanese Patent Application Laid-Open No. 4-293898, and is water glass, polyvinyl alcohol (PVA), carboxymethyl cellulose (CMC), or the like.
The thickener is a thickener described in JP-A-9-75388 and JP-A-6-343658, and examples thereof include CMC, polyvinylpyrrolidone, corn starch, and potato starch.
The excipient is an excipient described in JP-A-7-194441, such as pregelatinized starch and sodium alginate.
The water-soluble polymer is not a cross-linked product but a water-soluble polymer such as sodium carboxymethyl cellulose, which is finally a polymer that dissolves in water.

  EXAMPLES Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited thereto.

Example 1
1. 100 parts by weight of iron powder (particle size 300 μm or less), 5.5 parts by weight of activated carbon (particle size 300 μm or less), 2.3 parts by weight of wood powder (particle size 150 μm or less), water-absorbing polymer (particle size 300 μm or less) 3 parts by weight, 0.5 parts by weight of slaked lime, 0.2 parts by weight of sodium carboxymethylcellulose, 0.7 parts by weight of sodium sulfite and 11% saline were mixed to obtain a heat generating composition having an easy water value of 8.

Further, when the moldability test of the exothermic composition was performed, the degree of molding was 8, there was no substantial problem with heat sealing, and there was no sealing failure.

  When the exothermic composition exothermic test was conducted, the temperature was 25 ° C after 1 minute, 40 ° C after 3 minutes, and 50 ° C after 5 minutes, and the exothermic composition was 10 ° C or higher within 5 minutes. An exothermic reaction occurred.

Next, the heating element of FIG. 1 was created. Using a non-breathable base material in which an adhesive layer and a separator are provided on a polyethylene film, and using a 2 mm thick punch on the polyethylene film side, a plane with a thickness of 2 mm, a length of 115 mm, and a width of 80 mm A rectangular shaped exothermic composition molded body was molded and laminated on a substrate. Further, a breathable packaging material in which a nylon non-woven fabric and a polyethylene porous film are laminated is used as a covering material, and the polyethylene film surface and the porous film surface are overlapped with each other, and the seal width is 8 mm. Then, the peripheral portion of the heat-generating composition molded body was heat-sealed to prepare a rectangular uneven heating element having a length of 135 mm, a width of 100 mm, and a seal width of 8 mm. Incidentally, breathable dressing is moisture permeability of Risshi method was 370g ^/ m 2 ^/ 24hr.
The heating element was sealed and stored in a non-breathable outer bag and left at room temperature for 24 hours. An exothermic test was conducted, but after 3 minutes it felt warm and then warmed for more than 10 hours.

(Comparative Example 1)
An exothermic composition was prepared in the same manner as in Example 1 except that the mobile water value was 18. In addition, when a moldability test of the exothermic composition was performed, the exothermic composition molded body was not deformed even when the punching mold was separated from the exothermic composition molded body, and the exothermic composition molded body had a peripheral portion. There was no collapsed piece of the exothermic composition molded body. The forming degree was 95. The exothermic composition was not scattered in the seal portion, and the seal was good. The exothermic composition was molded to a height of 5 mm and a diameter of 50 mm, laminated on a polyethylene film having a thickness of 70 μm, and left in air at 20 ° C. It was not warm even after 10 minutes. Further, when the exothermic composition exothermic test was conducted, it was 20 ° C. after 1 minute, 20 ° C. for 3 minutes, 20 ° C. after 5 minutes, and 20 ° C. after 10 minutes. An exothermic reaction of 10 ° C. or higher did not occur within 5 minutes.

(Comparative Example 2)
An exothermic composition having an easy water value of 0 or less was prepared in the same manner as in Example 1 except that the easy water value was 0 or less. The forming degree was zero. There was no moldability, the heat generating composition was scattered in the seal portion, there was a seal failure, and it was unusable as a heat generator.

(Example 2)
Using the exothermic composition of Example 1 and through-molding using 5 punches with 5 mm width x 80 mm length punch holes at 5 mm intervals, an acrylic pressure-sensitive adhesive layer with a thickness of 30 μm is provided. The exothermic composition molded body constituting the five segmented exothermic parts was provided on the polyethylene film.
Next, a breathable coating material in which a nylon nonwoven fabric having a basis weight of 40 g / m ² is laminated on the polyethylene porous film is covered on the heat-generating composition molded body, The substrate was heat sealed.
Next, the division part which is a seal part of the peripheral part of each exothermic composition molded body was heat-sealed with a seal width of 3 mm, and a divided heat generation part divided by the division part was created. Moreover, the site | part used as the outer peripheral part of the said heat generating body was sealed by the seal width of 8 mm.
And the heat generating body which has a stripe-shaped division | segmentation heat generating part of length 98mm x width 91mm was obtained.
Incidentally, breathable breathable dressing with moisture permeability of Risshi method was 400g ^/ m 2 ^/ 24hr. The bending resistance was 20 mm in the long side direction (direction perpendicular to the stripe direction) of the heat generating portion, and was 80 mm or more in the short side direction (stripe direction).
As described above, when the bending resistance in one direction is very high and the bending resistance in a direction perpendicular to the one direction is very low, the handleability and the feeling of use are very excellent. Moreover, since this heat generating body can be wound, it becomes compact and is convenient for storage. In addition, in the case of the heat generating body 1 with a separator, it can be wound if a separator with low bending resistance is used.
The heating element was hermetically stored in a non-breathable storage bag (hereinafter referred to as an outer bag) and left at room temperature for 24 hours. After 24 hours, it was taken out from the outer bag and subjected to a heat generation test. In 3 minutes, it felt warm and the warmth continued for 7 hours. At the same time, the curved surface fit, winding property and usability were evaluated, but all were excellent. A part of the covering material may be separated from the base material. (A heating element similar to FIG. 4).

(Example 3)
As the oxidizing gas contact treatment device, a batch type oxidizing gas contact treatment device with stirring composed of a mixer equipped with a rotating blade for stirring was used, and air was used as the oxidizing gas.
Iron powder (particle size 300 μm or less) 100 parts by weight, activated carbon (particle size 300 μm or less) 5.5 parts by weight, wood powder (particle size 150 μm or less) 2.3 parts by weight, water-absorbing polymer (particle size 300 μm or less) 2.3 parts by weight , 0.5 parts by weight of slaked lime, 1.0 part by weight of sodium carboxymethylcellulose, 0.7 part by weight of sodium sulfite, 10 parts by weight of 11% saline, It put into the batch type oxidizing gas contact processing apparatus.
Next, in an environment of 20 ° C., the upper part of the oxidizing gas contact treatment device is open, and is self-heated while stirring in the air, and when it reaches 27 ° C. in 20 seconds, The contact-treated reaction mixture was sealed in a non-breathable storage bag and left to reach room temperature.
Next, 11% saline was added to the exothermic mixture and mixed to obtain an exothermic composition having a mobile water value of 9.

In addition, when the moldability test of the exothermic composition was performed, even if the die was separated from the exothermic composition molded body, the exothermic composition molded body was not deformed, and the molded molded body was not broken. It was. The forming degree was 10. There was no seal failure.
When the exothermic composition exothermic test was conducted, the same result as in Example 1 was obtained, and the exothermic composition had an exothermic reaction of 10 ° C. or more within 5 minutes.

A polyethylene film provided with an acrylic pressure-sensitive adhesive layer with a separator thickness of 30 μm, using the exothermic composition, by die-casting using a punching die having a width of 5 mm × length of 80 mm at intervals of 5 mm. The exothermic composition molding which comprises five division | segmentation exothermic parts was provided on the top. Next, a breathable coating material in which a nylon nonwoven fabric with a basis weight of 40 g / m ² is laminated on a polyethylene porous film is passed through a folding machine having a pair of concavo-convex surfaces and folded into a corrugated shape. Then, the valley of the covering material is pressed against the base material with a folding tool having an uneven surface, and the exothermic composition molded body is wrapped and covered in the peak portion of the covering material. did.
Next, the division part which is a seal part of the peripheral part of each exothermic composition molded body was heat-sealed with a seal width of 3 mm, and a divided heat generation part divided by the division part was created. Moreover, the site | part used as the outer peripheral part of the said heat generating body was sealed by the seal width of 8 mm.
And the heat generating body which has a stripe-shaped division | segmentation heat generating part of length 98mmX width 91mm was obtained.
Incidentally, breathable breathable dressing with moisture permeability of Risshi method was 400g ^/ m 2 ^/ 24hr. The bending resistance was 20 mm in the long side direction (direction perpendicular to the stripe direction) of the heat generating portion, and was 80 mm or more in the short side direction (stripe direction).
As described above, when the bending resistance in one direction is very high and the bending resistance in a direction perpendicular to the one direction is very low, the handleability and the feeling of use are very excellent. Moreover, since this heat generating body can be wound, it becomes compact and is convenient for storage. In the case of a heating element with a separator, it can be wound by using a separator having low bending resistance.
The heating element was hermetically stored in a non-breathable storage bag (hereinafter referred to as an outer bag) and left at room temperature for 24 hours. After 24 hours, it was taken out from the outer bag and subjected to a heat generation test. In 3 minutes, it felt warm and the warmth continued for 7 hours. At the same time, the curved surface fit, winding property and usability were evaluated, but all were excellent. A part of the covering material may be separated from the base material.

A modification of the shape of the heating element is shown in FIG.
(A) A broad bean, (b) An eye mask, (c) A bowl, (d) A bowl, (e) A rounded rectangle, (f) A rectangle, (g) A rounded square , (H) is square, (i) is oval, (j) is boomerang, (k) is starball, (l) is star, (m) is airfoil, (n) is airfoil , (O) is a nose shape, (p) is a lantern shape, (q) is a lantern shape, (r) is a saddle shape, (s) is a saddle shape, (t) is a foot shape, and (u) is a foot shape. (M) (n) is suitable around the neck and shoulders.
Perforations (perforated cuts), staggered cuts, perforations with V-notches (perforated cuts with V-notches), staggered with V-notches in at least a part of the region other than the section-shaped heat-generating portion of the heating element. A heating element provided with a through notch such as a notch is also included in the planar shape of the heating element of the present invention.
In addition, the shape of the heating element described in the present specification includes those obtained by modifying the described shape based on the basic shape.

(A) It is a top view which shows an example of the heat generating body of this invention. (B) It is sectional drawing of the same ZZ. (C) It is sectional drawing which shows another example of the heat generating body of this invention. (A) It is a top view which shows another example of the heat generating body of this invention. (B) It is sectional drawing of the same YY. (A) It is a top view which shows another example of the heat generating body of this invention. (B) It is sectional drawing of the same XX. (A) It is a top view which shows an example of the hot water heater of this invention. (B) It is sectional drawing of WW. (C) It is a top view which shows another example of the heat generating body of this invention. It is a top view which shows another example of the heat generating body of this invention. (A) It is a top view which shows another example of the heat generating body of this invention. (B) It is sectional drawing of the same VV. (A) It is a top view which shows an example of the heat generating body of this invention. (B) It is sectional drawing of the same part U-U. (C) It is sectional drawing which shows another example of the heat generating body of this invention. (A) It is a top view which shows another example of the heat generating body of this invention. (B) It is explanatory sectional drawing of the same TT. (A) It is a top view which shows an example of the heat generating body of this invention. (B) It is sectional drawing which shows another example of the heat generating body of this invention. (A) It is a top view which shows an example of the heat generating body of this invention. (B) It is sectional drawing of the same RR. (C) It is sectional drawing which shows an example when the same heat generating body expand | extends. (A) It is a top view which shows an example of the heat generating body of this invention. (B) It is sectional drawing of QQ. (C) It is sectional drawing which shows an example of the space of the same heat generating body. (D) It is sectional drawing which shows another example of the space of the same heat generating body. (E) And (f) It is a top view which shows an example of the heat generating body of this invention. (A)-(f) It is explanatory drawing of the measuring device of the molding degree of this invention. (A)-(u) It is a top view which shows an example of the outer shape of the heat generating body of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating body 2 Division | segmentation heat generating part 3 Separation part 4 Base material 5 Solid adhesive layer 6 Separator 7 Exothermic composition molded object 8 Covering material 9 Breathable adhesive layer 10 Coating material 11 Hot water heater 12 Hole 13 Band 14 Elasticity retention Member 15 notch 16 perforation 17 fixing means 18 scrim 19 support 20 air flow adjusting material 21 space ventilation layer 22 air hole 23 stainless steel mold 24 polyethylene film 25 stainless steel plate 26 mold holding means 27 jack 28 adhesive 29 acrylic adhesive 39 Collapsed piece W1 Mutual distance between opposing cuts (cutting feed width)
W2 Mutual distance (cut width) in the direction perpendicular to the extending direction of the cut

Claims (8)

  An exothermic composition containing iron powder, a carbon component, a reaction accelerator and water as essential components. The exothermic composition includes an agglomeration aid, an aggregating agent, an agglomeration aid, a dry binder, a dry binder, and a dry bond. The exothermic composition does not include a material, an adhesive material, a thickener, an excipient, and a water-soluble polymer, and the exothermic composition contains excess water having an easy water value of 0.01 or more and less than 14, The powder is a powder having a diameter of 500 μm or less, the degree of molding is 5 or more, and the exothermic composition is immediately after mixing each component within 5 minutes after being left in air in a windless 20 ° C. environment. A moldable excess water exothermic composition characterized by causing an exothermic reaction with a temperature increase of 10 ° C or higher.   The moldable excess water exothermic composition according to claim 1 is formed as a exothermic composition molded body by a mold, and is sandwiched between a base material and a covering material, and a peripheral portion of the exothermic composition molded body is sealed. Thus, a heating element having a heating part is provided, wherein the heating part has a shape similar to the molded heat generating composition, and at least a part of the heating part has air permeability.   The moldable excess water exothermic composition according to claim 1 is formed as a exothermic composition molded body by a mold, and the exothermic composition molded body is spaced from each other between the substrate and the covering material. A plurality of sandwiched heat generating parts are formed by sealing a peripheral edge of the heat generating composition molded body, and the section heat generating parts are similar to the heat generating composition molded body, and the section heat generating parts In the meantime, a section that substantially does not contain the exothermic composition is formed, the section heating section is not individually cut when the heating element is formed, and a plurality of section heating sections are cut as one piece, The heat generating element characterized in that the length of the minimum side which is the width of the section heat generating portion is 1 to 30 mm, at least a part of the section heat generating portion has air permeability, and has uneven surfaces on both sides. .   The heating element according to claim 3, wherein the minimum bending resistance in a surface orthogonal to the thickness direction of the heating element is 100 mm or less.   The heating element according to claim 3 or 4, wherein a change in minimum bending resistance before and after the heating of the heating element is 30% or less.   The heating element according to any one of claims 3 to 5, wherein a minimum bending resistance ratio in a plane perpendicular to the thickness direction of the heating element is 100 or less.   The heating element according to any one of claims 2 to 6, wherein a fixing means is provided on at least a part of the exposed part of the heating element.   An exothermic composition containing iron powder, a carbon component, a reaction accelerator and water as essential components. The exothermic composition includes an agglomeration aid, an aggregating agent, an agglomeration aid, a dry binder, a dry binder, and a dry bond. The exothermic composition does not include a material, an adhesive material, a thickener, an excipient, and a water-soluble polymer, and the exothermic composition contains excess water having an easy water value of 0.01 or more and less than 14, The diameter is a powder of 500 μm or less, the forming degree is 5 or more, and the exothermic composition is within 5 minutes after being left in the air in a 20 ° C. environment without wind immediately after mixing the components. A moldable excess water exothermic composition that causes an exothermic reaction with a temperature increase of 10 ° C. or more, and the exothermic composition is molded into a exothermic composition molded body by a molding method, and the exothermic composition molded body is After laminating on the base material, the covering material is covered, and the peripheral portion of the exothermic composition molded body is sealed. And, the manufacturing method of the heating element, characterized in that at least part of the heat generating portion is designed to have air permeability.

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