JP2016172577A - Oil-resistance air-permeable packaging material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil-resistance air-permeable packaging material which has superior oil-resistance than the conventional air-permeable packaging materials, and also has acid resistance that conform with a standard of the Food Sanitation Act.SOLUTION: An oil-resistance air-permeable packaging material 1 includes oil-resistant processed plastic-made film, and preferably, the plastic-made film is formed by laminating a perforated polyethylene terephthalate layer 11, a perforated polyethylene layer 12, a microporous film layer 13 and a reinforcement material layer 10 in this order. The microporous film 13 is oil-resistant processed, on the surface that comes into contact with the perforated polyethylene layer 12. The reinforcement material layer 10 is a net-like structure, in which a first fiber layer comprising a plurality of strings of first fiber arranged in the same direction to each other, and a second fiber layer comprising a plurality of strings of second fiber arranged in the same direction to each other but in a different direction from the first fiber, are laminated or woven.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oil-resistant breathable packaging material. In particular, the present invention relates to an oil-resistant breathable packaging material that has excellent oil resistance and satisfies standards such as the Food Sanitation Law and can be used for many purposes including food.

  Oxygen scavengers and desiccants are often used to prevent spoilage, alteration and deterioration of processed foods. This type of oxygen scavenger and desiccant is packaged in a sachet and stored with food. The same applies to packaging of contents whose quality changes due to oxidation, moisture absorption, etc. in addition to food. Such packaging materials such as desiccants, oxygen scavengers, and freshness-keeping agents are required to have air permeability because of evaporation of components for oxygen removal, drying, or freshness preservation.

  An oil-resistant breathable packaging material formed by laminating a perforated film made of nylon, a reinforcing material layer having a network structure, and a microporous moisture-permeable film in this order is known by the present applicants. (For example, refer to Patent Document 1). This oil-resistant breathable packaging material has mechanical strength and sufficient moisture permeability, and does not use paper, and therefore does not cause inconvenience such as fluffing.

  On the other hand, as oil-resistant and water-resistant oil-resistant breathable packaging materials, those using water-resistant paper and / or oil-resistant paper are known. Water resistant paper and oil resistant paper are produced by making paper impregnated with a water resistant agent or an oil resistant agent at the time of paper making, and are widely used.

JP 2010-105312 A

  However, with the diversification of food packaging forms, it is more oil-resistant than conventional oil-resistant breathable packaging materials, and has high functionality and oil resistance in line with food hygiene law standards such as acid resistance. There is a need for breathable packaging materials. In particular, in a material for packaging an oxygen scavenger, if the oil resistance is low, the function of the oxygen scavenger that is the inclusion may be impaired due to the penetration of the oil. On the other hand, conventional oil-resistant breathable packaging materials made of water-resistant paper or oil-resistant paper have a problem that paper dust can be mixed into food.

In view of these problems, there is a demand for an oil-resistant breathable packaging material made only of plastic, but such a packaging material does not currently exist on the market. The present invention has been made to solve the above problems. The present inventors have found that it is possible to impart oil resistance to a breathable film made of a plastic material with respect to a conventional packaging material, and have completed the present invention. That is, according to one embodiment, the present invention is an oil-resistant breathable packaging material made of an oil-resistant processed plastic film.
In the oil-resistant breathable packaging material, the plastic film is preferably selected from a moisture-permeable waterproof film, a nonwoven fabric, and a synthetic paper.
In the oil-resistant breathable packaging material, the oil-resistant processing is preferably performed using a fluorine-based oil-resistant processing agent.

In the oil-resistant breathable packaging material, the plastic film is formed by laminating a porous polyethylene terephthalate layer, a porous polyethylene layer, a microporous film layer, and a reinforcing material layer in this order. The surface of the porous film layer that is in contact with the porous polyethylene layer is oil-resistant processed, and the reinforcing material layer is a first fiber layer composed of a plurality of first fibers arranged in the same direction. And a second fibrous layer composed of a plurality of second fibers arranged in a different direction from the first fibers and in the same direction, the first fibrous layer comprising: It is preferable that it is a network structure in which the second fiber layer is laminated or woven.
In the oil-resistant breathable packaging material, the network structure is
(1) A non-woven fabric obtained by laminating a split fiber film obtained by splitting a longitudinally uniaxially stretched multi-layer polyolefin film and then widening the stretched film so that the stretch directions are substantially orthogonal;
(2) obtained by splitting a longitudinally uniaxially stretched multilayer polyolefin film, then splitting the resulting fiberglass film and expanding the multilayered polyolefin film, and forming a slit in the widthwise direction and then uniaxially stretching in the lateral direction. A nonwoven fabric obtained by laminating a net-like film so that the stretching direction is substantially orthogonal,
(3) A nonwoven fabric or a woven fabric formed by laminating a uniaxially stretched multilayer polyolefin tape in the longitudinal direction,
(4) A nonwoven fabric obtained by laminating a uniaxially stretched network film comprising trunk fibers extending in parallel to each other and branch fibers that connect adjacent trunk fibers, and a longitudinally uniaxially stretched multilayer polyolefin tape group layer,
(5) A uniaxially stretched network film comprising trunk fibers extending in parallel to each other and branch fibers that connect adjacent trunk fibers, and a longitudinal direction that is oblique to the stretching direction of the uniaxially stretched network film and that extends parallel to each other A first longitudinally uniaxially stretched multilayer polyolefin tape group composed of a uniaxially stretched multilayer polyolefin tape group, and a slanting direction from the opposite direction of the first longitudinally uniaxially stretched multilayer polyolefin tape group layer to the stretching direction of the uniaxially stretched network film. It is preferable to include any one of nonwoven fabrics formed by laminating a second longitudinally uniaxially stretched multilayer polyolefin tape group composed of a second longitudinally uniaxially stretched multilayer polyolefin tape group that intersects and extends in parallel with each other.

  The present invention is also the oil-resistant air-permeable packaging material described in any one of the above items, and preferably has a kit value of 7 to 12.

  According to another aspect of the present invention, there is provided a method for producing an oil-resistant breathable packaging material, wherein an oil-resistant agent is applied to at least one surface of a microporous film layer, and the microporous material is oil-resistant processed. A step of forming a film layer, a step of laminating a porous polyethylene terephthalate layer, a porous polyethylene layer, the oil-resistant processed microporous film layer, and a reinforcing material layer in this order are obtained by the step. And the step of thermocompression bonding the laminated body, wherein the oil-resistant processed surface of the oil-resistant processed microporous film layer is in contact with the porous polyethylene layer, and the reinforcing material layers are in the same direction as each other. A first fiber layer composed of a plurality of first fibers arranged in a first direction, and a second fiber layer composed of a plurality of second fibers arranged in a direction different from the first fibers and in the same direction as each other Is laminated or woven It is made reticular structure.

  According to another embodiment of the present invention, there is provided a packaging body using at least a part of the oil-resistant breathable packaging material described in any of the above, an oxygen scavenger, a desiccant, a freshness-keeping agent, and heat generation. A package containing an agent, a hygroscopic agent, a deodorizing agent, an insect repellent, a dehumidifying agent or a fragrance.

  According to another embodiment of the present invention, there is provided a packaging body comprising at least a part of the oil-resistant breathable packaging material provided with the above-described network structure, and the perforated polyethylene terephthalate layer facing outside. And a package containing an oxygen scavenger, desiccant, freshness-keeping agent, exothermic agent, moisture absorbent, deodorant, insect repellent, dehumidifier or fragrance.

  According to still another embodiment of the present invention, there is provided a method for manufacturing a package, wherein at least a part of the oil-resistant breathable packaging material provided with the network structure is used, The step of making the oil-resistant breathable packaging material into a bag shape with the reinforcing material layer inside so that both ends face each other, and the bag-shaped oil-resistant breathable packaging material with an oxygen scavenger, a desiccant, and a freshness-keeping agent A step of containing a heat generating agent, a hygroscopic agent, a deodorizing agent, an insect repellent, a dehumidifying agent or a fragrance, and a step of heat-sealing the three peripheral edges of the bag-like oil-resistant breathable packaging material by a hot press method. Including.

  According to the present invention, it is possible to obtain an oil-resistant breathable packaging material that sufficiently retains conventional characteristics such as air permeability, moisture permeability, and mechanical strength and that is excellent in oil resistance and acid resistance. Moreover, since the oil-resistant air-permeable packaging material of the present invention can be composed only of plastic without using paper, there is no problem of mixing paper dust even when used for food packaging. . Furthermore, the oil-resistant breathable packaging material according to the present invention is suitable for molding by a heat seal method, and is easy to produce a bag-shaped package, and thus has a wide range of applicability to various forms.

It is a conceptual sectional view showing an example of oil-resistant breathable packaging material concerning a 2nd embodiment of the present invention. It is a fragmentary perspective view of a split fiber film (longitudinal web) which is an example of a member which constitutes a network structure. It is the fragmentary perspective view which performed the split fiber process to the original fabric film used for manufacture of the split fiber film shown in FIG. It is a fragmentary perspective view of the net-like film (horizontal web) which is an example of the member which comprises a net-like structure. It is the fragmentary perspective view which gave the slit process to the original fabric film used for manufacture of the reticulated film shown in FIG. It is a conceptual diagram which shows the example of the reinforcing material layer which comprises the oil-resistant air permeable packaging material shown in FIG. It is a conceptual diagram which shows the example of the other reinforcing material layer which comprises the oil-resistant air permeable packaging material shown in FIG. It is a notional sectional view of a package according to a third embodiment of the present invention.

[First embodiment: Plastic oil-resistant breathable packaging material]
In a preferred embodiment, the present invention relates to an oil-resistant breathable packaging material made of plastic. In particular, it is an oil-resistant breathable packaging material made of an oil-resistant processed plastic film. That is, the oil-resistant breathable packaging material according to the present invention does not include paper.

  The plastic film may be a general film that can be used as a packaging material, and is particularly preferably a film having air permeability. The film having air permeability is preferably selected from a moisture permeable waterproof film, a nonwoven fabric, and synthetic paper, but is not limited thereto. More specifically, a nonwoven fabric by flash spinning using a polyolefin resin can be preferably used. Alternatively, a film that is originally made of a material that does not have the desired air permeability may be a film that has been perforated and subsequently provided with air permeability. Examples of such a film include, but are not limited to, a polyethylene terephthalate film, a polyethylene film, a polypropylene film, and a nylon film.

  The plastic film may be a single film made of a single material as long as it has strength, thickness, moisture permeability, heat resistance, and openings according to the application. Or the structure which laminated | stacked the several plastic film from which a characteristic and / or material differs may be sufficient.

  The plastic film may be surface-treated before oil-resistant processing to give desired properties. For example, a corona treatment or a coating treatment with a drug that can facilitate oil-resistant processing can be performed, but the treatment method is not limited thereto.

  In this embodiment, when the oil-resistant breathable packaging material is composed of a single layer, at least one surface of the plastic film is oil-resistant processed. In the oil-resistant processing, a general oil-resistant agent that is usually applied to the production of oil-resistant paper can be used. In particular, a fluorine-based oil-resistant agent is preferable, a fluorine-based oil-resistant agent containing a compound having a perfluoroalkyl group having a carbon chain length of 6 or less is more preferable, and a perfluorohydrocarbon carboxylic acid having a carbon chain length of 6 or less. Examples thereof include, but are not limited to, esters or salts, and phosphoric esters of perfluorohydrocarbons having a carbon chain length of 6 or less. As an example, the fluorine copolymer described in Japanese Patent No. 5418229 can also be used.

The fluorinated oil-resistant agent is preferably used for oil-resistant processing as a coating solution dissolved in a solvent such as water or ethanol. In particular, it is preferable to prepare a coating solution using ethanol as a solvent from the viewpoints of safety when the packaging material is used for food packaging and defoaming properties. The concentration of the coating solution is preferably 2 to 10 (volume / volume)%. Moreover, it is preferable that the wet coating amount at this time shall be 0.05-0.25 g / m < ² >.

  The coating solution for the fluorinated oil resistance agent may contain any additive as long as it does not impair the properties of the fluorinated oil resistance agent and dissolves in the solution. Examples of additives include dispersants, antifoaming agents, thickeners, water resistance agents, plasticizers, fluorescent agents, color pigments, coloring dyes, reducing agents, ultraviolet absorbers, antioxidants, fragrances, and deodorants. However, it is not limited to these. The amount added in a range that does not impair the properties of the fluorinated oilproofing agent varies depending on the component added.

  The coating solution of the fluorinated oil resistance agent dissolved in the solvent can be applied to the surface of the plastic film by various methods. For example, the coating solution may be applied to a plastic film using a gravure printing machine, or the plastic film may be immersed in the coating solution. Other methods include, but are not limited to, flexographic printing, offset printing, and spray coating.

  After applying the coating solution to the plastic film, it is allowed to dry at 100 ° C. or higher, preferably 100 to 150 ° C., more preferably 100 to 130 ° C. for 30 seconds or longer, preferably 30 to 60 seconds. preferable. Such an operation makes it possible to impart oil resistance to the plastic film.

  In the case where the oil-resistant breathable packaging material is composed of a multilayer in which the same or different plastic films are laminated, after producing a laminated body obtained by laminating the plastic film, the above-mentioned one or both surfaces of the laminated body According to the embodiment, oil resistant processing may be applied. Alternatively, a single-layer or laminated plastic film may be subjected to oil-resistant processing according to the above-described embodiment, and then the same or different plastic film may be laminated on the oil-resistant processed surface. Further, the same or different plastic film may be laminated. Therefore, in the oil-resistant breathable packaging material composed of multiple layers, it is not necessary that all the plastic films have been subjected to oil-resistant processing, and at least one layer of the plastic film constituting the oil-resistant breathable packaging material composed of multiple layers. If at least one surface is oil-resistant processed, it can be said to be an oil-resistant breathable packaging material made of an oil-resistant processed plastic film according to the present invention.

  The oil-resistant breathable packaging material according to this embodiment can be preferably used for food packaging and the like because it is relatively easy to produce and has oil resistance. In addition, since paper is not included, there is an advantage that no paper dust is generated from the cut surface when the package is manufactured, and the food is not contaminated.

[Second Embodiment: Oil-resistant Breathable Packaging Material with Four Layer Structure]
The present invention, in a preferred embodiment, relates to a multi-layer oil-resistant breathable packaging material. FIG. 1 shows a conceptual cross-sectional view of an oil-resistant breathable packaging material 1 according to a second embodiment of the present invention. The oil-resistant breathable packaging material comprises a perforated polyethylene terephthalate layer 11, a perforated polyethylene layer 12, a microporous film layer 13, and a reinforcing material layer 10, which are laminated in this order. The contact surface of 13 porous polyethylene layers 12 is oil-resistant processed. Below, each layer which comprises the oil-resistant air permeable packaging material 1 is demonstrated in detail.

(1) Perforated polyethylene terephthalate layer The perforated polyethylene terephthalate layer 11 constitutes one outermost surface layer in the oil-resistant breathable packaging material 1, and normally functions as a layer that comes into contact with food or the like. For the perforated polyethylene terephthalate layer 11, a general polyethylene terephthalate film material is used. The thickness of the perforated polyethylene terephthalate layer 11 can be appropriately determined by those skilled in the art according to the purpose and application of the oil-resistant breathable packaging material 1. For example, the thickness is about 5 to 50 μm, and typically 7 to 30 μm, but is not limited thereto. Moreover, the porous polyethylene terephthalate layer 11 has pores 50 formed at regular intervals as shown in FIG. The pores 50 are typically provided so as to penetrate all of the perforated polyethylene terephthalate layer 11 and an optional printed layer (not shown) described later, and the perforated polyethylene layer 12. This is to ensure air permeability. As for the size of the pore 50, for example, the pore diameter is about 0.05 to 0.5 mm, and typically 0.1 to 0.4 mm, but is not limited thereto. The density of the pores 50 is, for example, 2 to 10 mm, and typically 2.5 to 5 mm, but is not limited thereto.

  Further, the porous polyethylene terephthalate layer 11 may be colored although it depends on the presence or absence of printing described later. The perforated polyethylene terephthalate layer 11 may be a commercially available polyethylene terephthalate film, but can be appropriately produced by a generally known production method. Furthermore, if necessary, a polyethylene terephthalate layer having a surface treatment that imparts a desired function on the surface that is the outermost surface can be used.

  When the porous polyethylene terephthalate layer 11 forms a package using the oil-resistant breathable packaging material 1 according to the present embodiment, the porous polyethylene terephthalate layer 11 normally does not contact the inclusions and constitutes the outermost layer. Since the polyethylene terephthalate layer 11 has many uses in food packaging applications, there are advantages in that the resin has been widely used and the reliability in terms of quality is high.

  Printing can be performed on the back surface of the perforated polyethylene terephthalate layer 11, that is, the surface in contact with the perforated polyethylene layer 12. The perforated polyethylene terephthalate layer 11 can be printed clearly, and print information can be clearly seen from the surface side. Since printing is performed on the back surface of the perforated polyethylene terephthalate layer 11, the printing portion is not exposed on the surface of the package, and even if the package is stored together with food, the printing ink does not come into contact with the food. Therefore, for printing, ink that is generally used for printing on packaging materials that conforms to the NL regulations of “Voluntary Regulations for Printing Inks for Food Packaging Materials” established by the Federation of Printing Ink Industries can be used.

(2) Perforated polyethylene layer The perforated polyethylene layer 12 functions as an adhesive between the perforated polyethylene terephthalate layer 11 and the oil-resistant processed surface of the microporous film layer 13, and improves the adhesion between the layers. is there. As the porous polyethylene layer 12, for example, general-purpose low density polyethylene can be used. The thickness of the perforated polyethylene layer 12 can be appropriately determined by those skilled in the art according to the purpose and application of the oil-resistant breathable packaging material 1. For example, the thickness is about 5 to 50 μm, and typically 7 to 30 μm, but is not limited thereto. The perforated polyethylene layer 12 is formed with pores 50 penetrating from the perforated polyethylene terephthalate layer 11 through a printing layer that is optionally provided.

(3) Microporous film layer The microporous film layer 13 is located between the perforated polyethylene terephthalate layer 11 and the reinforcing material layer 10 described later, and is oil-resistant on the surface in contact with at least the perforated polyethylene terephthalate layer 11. Sexual processing is done. The microporous film layer 13 is a film made of a polyolefin-based thermoplastic resin, and a microporous film is formed in the resin composition by stretching a resin composition made of a polyolefin-based resin containing a filler. It imparts air permeability and oil resistance by oil resistance processing. The thickness of the microporous film layer 13 can be appropriately determined by those skilled in the art according to the purpose and application of the oil-resistant breathable packaging material 1. For example, it is about 5 to 70 μm, and typically 10 to 50 μm, but is not limited thereto.

  Specifically, examples of the thermoplastic resin used for the microporous film layer 13 include α-olefin homopolymers such as low density polyethylene, high density polyethylene, polypropylene, and polybutene, and at least one of ethylene and 3 to 18 carbon atoms. Copolymers of α-olefins, copolymers of propylene and ethylene and / or butene-1, organic carboxylic acids having an ethylenically unsaturated bond, such as ethylene and vinyl acetate and / or acrylic esters and methacrylic esters Examples include copolymers with acid derivatives. Among these, in particular, a copolymer of ethylene and at least one α-olefin having 3 to 8 carbon atoms is preferable from the viewpoint of strength at the time of blending the filler, and further, low density polyethylene, ethylene, and 3 to 8 carbon atoms. Of these, a blend of a copolymer with at least one α-olefin is preferred from the viewpoint of extrusion lamination and stretchability.

  The amount of the filler to be blended in the microporous film layer 13 is preferably 30 parts by mass or more and 300 parts by mass or less with respect to 100 parts by mass of the thermoplastic resin. When the amount is less than 30 parts by mass, it is difficult to develop air permeability after stretching, and when it exceeds 300 parts by mass, there is a possibility of breaking during stretching.

  The filler is blended with the thermoplastic resin in the form of fine powder. As the filler, both inorganic fillers and organic fillers can be used. Examples of inorganic fillers include carbonates such as calcium carbonate, magnesium carbonate and barium carbonate, sulfates such as barium sulfate, magnesium sulfate and calcium sulfate, phosphates such as magnesium phosphate and calcium phosphate, magnesium hydroxide, water Hydroxides such as aluminum oxide, oxides such as alumina, silica, magnesium oxide, calcium oxide, zinc oxide and titanium oxide, chlorides such as zinc chloride, iron chloride and sodium chloride, aluminum powder, zeolite, shirasu, clay, Examples include diatomaceous earth, talc, carbon black, and volcanic ash. Examples of organic fillers include cellulose-based powders such as wood powder and pulp powder, synthetic resin-based powders such as nylon powder, polycarbonate powder, polypropylene powder, and poly-4-methylpentene-1 powder, and starch. These may be used alone or in combination of two or more. Among the fillers described above, in the present invention, calcium carbonate is particularly preferably used from the viewpoint of the breathability, flexibility, appearance, etc. of the final oil-resistant breathable packaging material 1. The average particle size of the filler is preferably 0.1 to 20 μm from the viewpoint of uniformity of the microporous film layer 13, and more preferably 0.8 to 5.0 μm from the viewpoint of workability.

The draw ratio for making the thermoplastic resin containing the filler into the microporous film layer 13 is preferably 1.02 or more. If the draw ratio is less than 1.02, micropores are not sufficiently formed, and it becomes difficult to obtain a desired air permeability. In order to exhibit high air permeability at such a low draw ratio, the thermoplastic resin preferably contains 30% by mass or more of a resin having a density of 0.920 g / cm ³ or more.

  The oil resistance processing is performed on at least one surface of the microporous film layer 13, and may be performed on both surfaces of the microporous film layer 13. The oil resistance processing can be performed by applying an oil resistance processing agent to the microporous film layer 13. Examples of the oil-resistant processing agent include those described in the first embodiment, and a fluorine-based oil-resistant processing agent is particularly preferable. Further, the preferred oil-resistant processing method is also as described in the first embodiment.

(4) Reinforcement material layer The reinforcement material layer 10 is located on the surface of the microporous film layer 13 opposite to the porous polyethylene layer 12 and constitutes one outermost surface layer in the oil-resistant breathable packaging material 1. To do. When the functional material such as an oxygen scavenger is packaged using the oil-resistant breathable packaging material 1, the reinforcing material layer 10 pierces the oil-resistant breathable packaging material 1, for example, with an article having a sharp shape, Prevents breakage and ensures the required breathability. The reinforcing material layer 10 includes a first fiber layer composed of a plurality of first fibers arranged in the same direction and a plurality of second fibers arranged in a direction different from the first fibers and in the same direction. A network structure including at least a second fiber layer made of the above fibers, wherein the first fiber layer and the second fiber layer are laminated or woven. Examples of such a network structure include various embodiments and are not particularly limited, but those having a certain strength and air permeability derived from the network structure are preferable.

  The network structure is preferably formed by laminating or weaving a second fiber layer in which the second fibers are arranged in the longitudinal direction and a first fiber layer in which the first fibers are arranged in the transverse direction. . There is no particular limitation as to which of the first fiber layer and the second fiber layer is in contact with the microporous film layer 13. In the present specification, the “longitudinal direction” means a machine direction, that is, a feeding direction in manufacturing a nonwoven fabric, a web, a laminate, and the like, and is also referred to as a length direction. “Lateral direction” means a direction perpendicular to the longitudinal direction, that is, the width direction of a nonwoven fabric, web, laminate, or the like. Hereinafter, a specific structure and manufacturing method of the network structure functioning as the reinforcing material layer 10 will be described.

[First network structure: split fiber nonwoven fabric]
The first network structure is a split fiber nonwoven fabric obtained by laminating a split fiber film obtained by splitting and then widening a longitudinally uniaxially stretched multilayer polyolefin film so that the stretch directions are substantially orthogonal. That is, in the first network structure, both the first fiber layer and the second fiber layer are split fiber films, and the arrangement direction of the fibers is substantially orthogonal.

  FIG. 2 shows a split fiber film (longitudinal web) in which fibers are arranged in the longitudinal direction, which is an example of the second fiber layer of the first network structure. As shown in FIG. 2A, the split fiber film 102 has a plurality of trunk fibers 102c extending in parallel with each other, and intersecting with the trunk fibers 102c, and adjacent trunk fibers 102c. It is comprised with the branch fiber 102d which connects. The branch fibers 102d are thinner than the trunk fibers 102c, and the mechanical strength of the split fiber film 102 is mainly provided by the trunk fibers 102c. The split fiber film 102 has a high tensile strength in the stretching direction. Then, as shown in FIG. 2B, the split fiber film 102 is formed by sequentially laminating a second thermoplastic resin layer 102b, a first thermoplastic resin layer 102a, and a second thermoplastic resin layer 102b. It has a three-layer structure.

  In the split fiber film 102, the thickness of the second thermoplastic resin layer 102b is 50% or less, desirably 40% or less, of the total thickness of the split fiber film 102 layer. In order to satisfy various physical properties such as adhesive strength at the time of thermal welding between the first fiber layer and the second fiber layer, the thickness of the second thermoplastic resin layer 102b may be 5 μm or more, preferably Is selected from the range of 10 to 50 μm. In addition, the thickness here is the thickness before extending | stretching.

  The first thermoplastic resin layer 102a and the second thermoplastic resin layer 102b are resin layers mainly composed of a thermoplastic resin. Examples of the thermoplastic resin include polyolefins such as polyethylene and polypropylene, which have good splitting properties, and copolymers thereof. Further, the difference in melting point between the first thermoplastic resin and the second thermoplastic resin is required to be 5 ° C. or more, and preferably 10 to 50 ° C. for manufacturing reasons.

  The illustrated split fiber film 102 has a three-layer structure, but may be a single layer or two layers. Or it may be provided with more layers, for example, it may be a multilayer structure of four layers, five layers, or six layers or more.

  Examples of the method for producing the split fiber film 102 include the following methods. First, a resin constituting each layer is kneaded, and then an original film having a three-layer structure is manufactured by extrusion molding such as a multilayer inflation method or a multilayer T-die method. Next, as shown in FIG. 3, the raw film 200 is stretched in the longitudinal direction (L direction in the figure). The draw ratio (orientation ratio) is preferably 1.1 to 15 times, more preferably 3 to 10 times. If the draw ratio is less than 1.1 times, the mechanical strength may not be sufficient. On the other hand, when the draw ratio exceeds 15 times, it is difficult to stretch by a usual method, and there may be a problem that an expensive apparatus is required. Stretching is preferably performed in multiple stages in order to prevent stretching unevenness. Next, the stretched film is split in a vertical direction (L direction shown in FIG. 3) in a zigzag manner using a splitter (split treatment) to form a large number of parallel slits 200a. Furthermore, it widens in the direction orthogonal to this. Thereby, the split fiber film 102 as shown to Fig.2 (a) is obtained. The split fiber film 102 thus produced has a high tensile strength in the stretching direction.

  Next, two pieces of the obtained split fiber film 102 are overlapped so that the trunk fibers are substantially orthogonal to each other, and this is heated and welded. At this time, one of the two split fiber films corresponding to the second fiber layer can be continuously supplied in-line in the machine direction. The other split fiber film corresponding to the first fiber layer is manufactured as described above, and the wound split fiber film is cut into the same length as the width of the split fiber film supplied in-line. Then, the tiles are intermittently supplied and overlapped. When heat-welding, the two split fiber films overlapped are supplied between a pair of opposed heating cylinders and fixed so as not to shrink in the width direction, and the stretching effect of the surface layer is lost. In order to prevent this, thermal welding is performed at a temperature not higher than the melting point of the thermoplastic resin constituting the inner layer and not lower than the melting point of the thermoplastic resin constituting the surface layer. Thereby, a network structure can be obtained. In addition, it can replace with the heat welding in the manufacturing method of a network structure, and can also integrate using other arbitrary adhesion means, such as an adhesive material.

  The reinforcing material layer 10 made of the split fiber nonwoven fabric configured as described above has a mesh structure and has a certain opening ratio, and therefore has air permeability. Examples of such commercially available split fiber nonwoven fabrics include, but are not limited to, JX Nippon Mining & Energy's Warif (registered trademark) S24L, SS24L, SS28L and the like.

[Second network structure: network nonwoven fabric]
The second network structure is formed by splitting a longitudinally uniaxially stretched multilayer polyolefin film and then widening it, and forming a slit in the width direction in the multilayer polyolefin film, and then uniaxially stretching in the transverse direction. A reticulated nonwoven fabric obtained by laminating the reticulated film obtained in such a manner that the stretching directions are substantially orthogonal. That is, in the second network structure, the first fiber layer is a split fiber film, and the second fiber layer is a mesh film. The first fiber layer and the second fiber layer are terms used for distinguishing between the two layers constituting the network structure, and are distinguished in the stacking order and relative relationship with other layers. It is not something.

  The shape, structure, and manufacturing method of the split fiber film constituting the first fiber layer are as described above.

  FIG. 4 shows a reticulated film (transverse web) in which fibers are arranged in the transverse direction, which is an example of the second fiber layer of the second reticulated structure. As shown in FIG. 4A, the net-like film 103 is formed in a mesh shape having a substantially rhombic shape. And as shown in FIG.4 (b), the net-like film 103 laminated | stacked the 2nd thermoplastic resin layer 103b, the 1st thermoplastic resin layer 103a, and the 2nd thermoplastic resin layer 103b in order. It has a three-layer structure.

  The relationship between the thickness of the entire mesh film 103 and the thickness of the layer 103 b made of the second thermoplastic resin is the same as that described for the split fiber film 102 described above, and the resin material constituting the mesh film 103 is also the same. The material substantially the same as that of the above-described split fiber film 102 can be used, and detailed description thereof is omitted.

  The method for producing the net-like film 103 is to first produce a three-layer original film, and then, as shown in FIG. 5, slits are staggered in the lateral direction (T direction shown in FIG. 5) with respect to the original film 300. Processing is performed to form a large number of parallel slits 300a. Thereafter, the raw film 300 is stretched in the lateral direction (T direction shown in FIG. 5). In this way, after forming slits in the original fabric film 300 in advance, the slit films 103 are stretched in the lateral direction to obtain a net-like film 103 in which rhombic meshes are formed. The slit 300a in the horizontal direction passes and conveys the raw film between a rotating roller having a linear protrusion formed in the axial direction on the outer peripheral surface of the cylinder and a rotating roller having a flat outer peripheral surface opposite to the rotating roller. Can be formed.

  Finally, the split fiber film 102 and the net-like film 103 are overlapped so that the stretching directions are substantially orthogonal, and these are heated and welded to obtain a net-like structure made of a net-like non-woven fabric. In this case, the mode of heat welding or adhesion may be the same as that of the first network structure.

  The reticulated film is not limited to the one having the rhombic reticulated structure shown in the figure. It is generally stretched in the transverse direction, and when it is overlapped with the split fiber film in the machine direction, the stretch direction should be substantially orthogonal. For example, like the split fiber film shown in FIG. A pattern composed of a plurality of extended trunk fibers and branch fibers that extend across the trunk fibers and connect adjacent trunk fibers, and rotated by ± 90 ° with respect to the split fiber film when viewed in plan Alternatively, it may have a similar pattern.

  When laminating a net-like structure made of a net-like non-woven fabric as the reinforcing material layer 10 with the microporous film layer 13, it may be laminated so that the split fiber film 102 side is in contact with the microporous film layer 13, You may laminate | stack so that the net-like film 103 side may contact | connect the microporous film layer 13. FIG.

  The reinforcing material layer 10 itself composed of a net-like nonwoven fabric configured in this way has a mesh structure, has a certain opening ratio, has air permeability, and has a strength that can prevent piercing of inclusions. Have. Examples of typical commercial products of such a reticulated nonwoven fabric include CLAF (registered trademark) SS (T) EL, 3S (T), and S (F) EL manufactured by JX Nippon Oil & Energy. It is not limited to.

[Third network structure: non-woven fabric / woven fabric made of uniaxially stretched multi-layer polyolefin tape in the longitudinal direction]
The third network structure is a nonwoven fabric or a woven fabric formed by weaving a uniaxially stretched multilayer polyolefin tape in the longitudinal direction. That is, the third network structure is composed of a plurality of longitudinally uniaxially stretched multilayer polyolefin tape groups in both the first fiber layer and the second fiber layer. In the case of a nonwoven fabric, a plurality of longitudinally uniaxially stretched multi-layer polyolefin tape groups are laminated and welded or bonded so that the stretching directions are substantially orthogonal. In the case of a woven fabric, a plurality of longitudinally uniaxially stretched multi-layer polyolefin tape groups are warps, and a plurality of longitudinally uniaxially stretched multi-layer polyolefin tape groups are wefts, and are woven by any weaving method and welded or bonded. ing.

  In the same way as the split fiber film described in the first network structure, the longitudinally uniaxially stretched multilayer polyolefin tape produces a three-layer structure raw film by extrusion molding such as a multilayer inflation method or a multilayer T-die method. The film can be produced by uniaxially stretching 1.1 to 15 times, preferably 3 to 10 times in the direction, and then cutting along the stretching direction with a width of, for example, 2 mm to 7 mm. Alternatively, similarly, a three-layer original film is manufactured, cut in the same direction along the machine direction, and then uniaxially stretched 1.1 to 15 times, preferably 3 to 10 times in the machine direction. Can be manufactured. In such a longitudinal direction uniaxially stretched multilayer polyolefin tape, the stretching direction coincides with the longitudinal direction of the tape, and is referred to as a longitudinal direction uniaxially stretched multilayer polyolefin tape in this specification.

  An example of a network structure composed of a nonwoven fabric formed by laminating such a longitudinally uniaxially stretched multilayer polyolefin tape is shown in FIG. In FIG. 6, the network structure 40 includes a plurality of longitudinally uniaxially stretched multilayer polyolefin tapes corresponding to warps arranged in parallel as a first fiber layer 402 at a certain interval, and the longitudinally uniaxially stretched multilayer polyolefin tapes. A plurality of longitudinally uniaxially stretched multilayer polyolefin tapes corresponding to wefts are laminated as the second fiber layer 403 so that the longitudinal directions of the fibers are substantially orthogonal. And the 3rd network structure is obtained by heat-welding the contact surface of a warp and a weft. In this case, the mode of heat welding or adhesion is the same as that of the first network structure. Although not shown, the woven fabric can be produced in the same manner except that a plurality of longitudinally uniaxially stretched multilayer polyolefin tapes are woven instead of being laminated.

  As an example of such a commercial product of nonwoven fabric, Sof (trade names) HN55 and HN66 manufactured by Sekisui Film Co., Ltd. can be used. As an example of a commercially available woven fabric, Meltac (trade name) manufactured by Ebara Industries Co., Ltd. can be used.

[Fourth network structure: network structure of split fiber film and longitudinally uniaxially stretched multilayer polyolefin tape]
The fourth network structure is formed by laminating a uniaxially stretched network film including trunk fibers extending in parallel to each other, branch fibers connecting the adjacent trunk fibers, and a longitudinally uniaxially stretched multilayer polyolefin tape group layer. It is a nonwoven fabric. The reticulated film is not particularly limited as long as it is a uniaxially stretched film having the structural characteristics of the trunk fiber and the branch fiber.For example, as a preferred example of the reticulated film, after splitting a longitudinally uniaxially stretched multilayer polyolefin film, The split fiber film obtained by widening can be mentioned. In the description of the fourth network structure, an embodiment in which a split fiber film is mainly used as the network film will be described, but the network film of the fourth network structure is not limited to the split fiber film. That is, in the fourth network structure of the present invention, typically, the first fiber layer is a split fiber film, and the second fiber layer is composed of a plurality of longitudinally uniaxially stretched multilayer polyolefin tapes. Furthermore, it comprises a third fiber layer composed of a plurality of longitudinally uniaxially stretched multilayer polyolefin tapes obliquely intersecting the second fiber layer.

  An example of such a network structure is shown in FIG. A network structure 60 shown in FIG. 7 includes a split fiber film 102 including trunk fibers 102c extending in parallel to each other, branch fibers 102d connecting the adjacent trunk fibers, and a slanting direction in the stretching direction of the uniaxially stretched network film. A first longitudinally uniaxially stretched multilayer polyolefin tape group composed of a group of longitudinally uniaxially stretched multilayer polyolefin tapes 402 intersecting and extending parallel to each other, and a direction opposite to the first longitudinally uniaxially stretched multilayer polyolefin tape group A second longitudinally uniaxially stretched multilayer polyolefin tape group composed of a second longitudinally uniaxially stretched multilayer polyolefin tape 403 group that is oblique to the stretching direction of the uniaxially stretched network film and extends parallel to each other is laminated. It is a nonwoven fabric. In the network structure 60 shown in FIG. 7, a longitudinal uniaxially stretched multilayer polyolefin tape 402 is laminated on the split fiber film 102 at an angle α ′ with respect to the longitudinal direction L thereof. Further, the longitudinally uniaxially stretched multilayer polyolefin tape 403 is laminated obliquely with respect to the longitudinally uniaxially stretched multilayer polyolefin tape 402 and at an angle α with respect to the longitudinal direction L. Such a network structure has strength in the stretching direction of the split fiber film and extensibility in a direction substantially perpendicular to the stretching direction of the split fiber film. In this case, α and α ′ may be the same or different, and may be 45 to 60 degrees, for example.

  About the manufacturing method of the split fiber film 102 which comprises the network structure 60, and a longitudinal direction uniaxially stretched multilayer polyolefin tape 402,403, it is as having demonstrated the 1st, 3rd network structure, and manufactures it similarly. Can do. The network structure 60 can be obtained by laminating them and welding or bonding the contact portions.

  As a network film in the fourth network structure, in addition to the split fiber film 102 described in detail, for example, after forming a large number of slits in the width direction on the raw film having the same configuration as the split fiber film 102, What is obtained by stretching at the same draw ratio as the split fiber film 102 in the width direction, that is, when viewed in plan, has a pattern rotated by ± 90 ° with respect to the split fiber film or a similar pattern thereto. Things can be used. Also in this case, the reticulated film, the first longitudinally uniaxially stretched multilayer polyolefin tape group layer, and the second longitudinally uniaxially stretched multilayer polyolefin tape group layer are obliquely crossed with respect to the stretching direction. Can be stacked. And the network structure obtained by laminating | stacking will be equipped with the characteristic that it is excellent in the intensity | strength in a horizontal direction and the extensibility of a vertical direction. Alternatively, it is a network structure in which two layers of a network film and a first longitudinal uniaxially stretched multilayer polyolefin tape group layer are laminated so that the stretching direction of the network film and the longitudinal direction of the polyolefin tape group intersect. May be.

[Fifth network-like structure: various laminates, net-like objects]
The fifth network structure is a laminate comprising any combination of various films used in the production of the first to fourth network structures and a uniaxially stretched multilayer polyolefin tape in the longitudinal direction. In particular, the network structure is a combination of one or more of the following layers: (i) split fiber film (ii) network film (iii) a plurality of longitudinally uniaxially stretched multilayer polyolefin tapes. When the layer (iii) is included, it is preferable to provide two or more layers (iii) and layers (iii) having different orientation directions.

  As still another example of the reinforcing material layer, a net-like material made of polyethylene or polypropylene can be used. Examples of the net-like material include Kurenet (trade name) manufactured by Kurabo Industries Co., Ltd., Conwed Net manufactured by Conwed, and Thermanet (trade name). Furthermore, a woven fabric or a nonwoven fabric obtained by combining filaments spun from a thermoplastic resin and stretched so that the stretching directions are substantially orthogonal to each other can also be used.

[Method for producing oil-resistant breathable packaging material]
Next, the oil-resistant breathable packaging material according to the present embodiment will be described from the viewpoint of the manufacturing method. An example of a method for producing an oil-resistant breathable packaging material is that a polyethylene terephthalate film is printed on the back surface as necessary, and then a polyethylene layer is formed on the back surface by an extrusion coating method or the like. The polyethylene terephthalate film having the polyethylene layer formed on the back surface is subjected to a hole opening treatment to obtain a laminate of the porous polyethylene terephthalate layer 11 and the porous polyethylene layer 12. On the other hand, at least one surface of the microporous film layer 13 is subjected to oil resistance processing. In the oil-resistant processing, an oil-resistant processing agent diluted to 2 to 10% by volume with an appropriate solvent, preferably water or ethanol, so that the wet coating amount is about 0.05 to 0.25 g / m ^2. It can be carried out by applying to the microporous film layer 13 and drying at about 100 to 130 ° C. for about 30 to 60 seconds.

  Subsequently, the laminated body of the perforated polyethylene terephthalate layer 11 and the perforated polyethylene layer 12, the microporous film layer 13 processed with oil resistance, and the reinforcing material layer 10 are joined by a thermocompression bonding method. Bonding of these layers can be performed at once by a thermocompression bonding method after being laminated. At this time, lamination is performed so that the oil-resistant processed surface of the microporous film layer 13 and the porous polyethylene layer 12 are in contact with each other. This is to prevent oil from penetrating into the microporous film layer 13 and impairing air permeability. By this process, the oil-resistant breathable packaging material 1 according to the present invention can be obtained. In this case, the thermocompression bonding conditions are, for example, 120 to 140 ° C., preferably 125 to 140 ° C., for example, a linear pressure of 150 to 260 N / cm. Although the specific method of thermocompression bonding can be implemented by a steam heating roll or a dielectric heating roll, it is not limited to these. Another example of a method for producing an oil-resistant breathable packaging material is a microporous film obtained by obtaining a laminate of a perforated polyethylene terephthalate layer 11 and a perforated polyethylene layer 12 and then subjecting this laminate to oil resistance processing. A three-layer laminate obtained by joining the layer 13 is obtained, and then the reinforcing material layer 10 is laminated on the three-layer laminate by a thermocompression bonding method or other bonding methods, and the oil-resistant breathability according to the present embodiment is obtained. Packaging materials can also be obtained.

  And although this oil-resistant air-permeable packaging material 1 is not limited in its thickness, it is usually in the form of a flexible film having a thickness of about 150 to 250 μm, preferably about 100 to 200 μm. It is. The oil-resistant breathable packaging material 1 according to the present embodiment is an index of oil resistance according to TAPPI UM 557 “Repellency of Paper and Board to Green, Oil, and Waxes (Kit Test)” by having the above-described layer configuration. A certain Kit value is 7 or more, preferably 7-12. If the Kit value is less than 7, oil resistance in food packaging may not be satisfied. On the other hand, if the Kit value is greater than 12, the air permeability of the packaging material based on this configuration may be impaired.

  In addition, the oil-resistant breathable packaging material 1 according to this embodiment conforms to the 4% acetic acid elution residue test in the standard of food, additives, etc. (S34 Ministry of Health and Welfare Notification No. 370) based on the Food Sanitation Law. Yes. Specifically, the oil-resistant breathable packaging material 1 according to the present embodiment satisfies the evaporation residue “30 μg / ml or less” defined by the above-mentioned standard. The amount of evaporation residue of the oil-resistant breathable packaging material 1 according to the present embodiment is more preferably 20 μg / ml or less, and further preferably 15 μg / ml or less.

  By conforming to both of these standards, it can be used for packaging materials such as oxygen scavengers, desiccants, freshness-retaining agents, etc., which are not possible in the prior art, for example, in food packaging containing a large amount of oil. In particular, it can be suitably used in packaging oxygen scavengers, freshness-keeping agents, etc. (alcohol transpiration agents). The air permeability required for the packaging material varies depending on the inclusion, and the desired number of pores of the porous polyethylene terephthalate film 11 and the porous polyethylene film 12 and the microporous film layer 13 can be adjusted by adjusting the air permeability. The air permeability can be set.

  Further, by providing the reinforcing material layer 10 as described above, the puncture of the packaging material due to the inclusion is prevented, the mechanical strength such as the tensile strength similar to that of the prior art is given, and the desired air permeability is given. . Furthermore, by using the various network structures described in the above embodiment, the strength balance in the vertical and horizontal directions is excellent, and the tensile strength and the air permeability can be further improved.

[Third Embodiment: Packaging]
According to the third embodiment, the present invention is a package, which uses at least part of the oil-resistant breathable packaging material 1 according to the first embodiment and / or the second embodiment. And functional articles such as freshness-retaining agents, exothermic agents, hygroscopic agents, deodorizing agents, insect repellents, dehumidifying agents or fragrances.

  In a particularly preferred aspect, the package uses at least part of the oil-resistant breathable packaging material 1 according to the second embodiment, and the oxygen-removing agent, desiccant, freshness-retaining agent with the porous polyethylene terephthalate layer on the outside. It contains functional articles such as exothermic agents, hygroscopic agents, deodorizing agents, insect repellents, dehumidifying agents or fragrances.

  FIG. 8 shows a conceptual cross-sectional view of a package using the oil-resistant breathable packaging material 1 according to the second embodiment. A packaging body 6 according to the third embodiment is formed by forming the oil-resistant breathable packaging material 1 according to the second embodiment into a bag shape so that the reinforcing material layer 10 is inside, and the functional article 5 is accommodated therein. Become. In FIG. 8, the display of pores penetrating the perforated polyethylene terephthalate layer 11 and the perforated polyethylene layer 12 is omitted. When making the package 6 from the oil-resistant breathable packaging material 1, the reinforcing material layer 10 is used as a heat seal layer. Specifically, the oil-resistant breathable packaging material 1 is folded into a bag shape with the reinforcing material layer 10 facing inside so that both ends of the reinforcing material layer 10 face each other, and the functional article 5 is wrapped, and the peripheral portion, preferably The three side edges are heat sealed by hot pressing. Thereby, it seals so that the functional article 5 may not be discharge | released outside the package. Specific functional articles 5 include, but are not limited to, silica-ethanol, silica-based, clay-based or calcium chloride, iron powder, magnesium oxide, and zeolite.

  Due to the excellent mechanical strength of the oil-resistant breathable packaging material 1, when the package 6 is formed using the oil-resistant breathable packaging material 1, damage due to the functional article 5 housed therein is less likely to occur. In addition to the oxygen scavenger and desiccant, it can also be effectively used as a large packaging material for storing the functional article 5 having a large weight such as activated carbon or charcoal. Moreover, since the surface layer of the package 6 becomes the porous polyethylene terephthalate layer 11, paper dust is not generated and it is hygienic. Furthermore, since the reinforcing material layer 10 serving as a heat seal layer when forming the package 6 uses a polyolefin-based resin as a thermoplastic resin, the melting point difference from the perforated polyethylene terephthalate layer 11 which is the surface layer becomes large. Accordingly, the heat sealing temperature can be set high to shorten the heat sealing time, and the filling speed of the functional article 5 can be increased accordingly, so that the productivity of the package 6 can be improved.

  The oil-resistant breathable packaging material of the present invention can be suitably used for packaging oxygen scavengers, desiccants, freshness-preserving agents, but includes moisturizers, fragrances, moisture absorbents, deodorants, insect repellents, dehumidifiers, etc. It can also be suitably used for packaging the functional article 5. The packaging body for storing these functional articles 5 may be in any form as long as the functional articles 5 function. If the package is in the form of a bag, the oil-resistant breathable packaging material may be used on a portion, one side, or the entire bag. A heat press method using a heat seal bar is generally used as a heat seal method of an oil-resistant breathable packaging material for forming a package. Therefore, when the package is in the form of a bag, a general bag making and packaging machine that forms a bag from a sheet material can be used. Moreover, since the oil-resistant air-permeable packaging material of this invention is excellent in tensile strength as mentioned above, it can be utilized also as a large sized package and a sheet-like package.

  In another aspect, the package uses the oil-resistant breathable packaging material 1 according to the first embodiment as at least a part thereof and houses a functional article. In such an embodiment, depending on the material of the plastic film, it may be difficult to make a heat-sealed bag, but it is possible to use a general adhesive or a combination with other materials, for example, an ultrasonic welder. By using a method such as bonding, a bag can be manufactured using the oil-resistant breathable packaging material 1 as a part of the material, and a functional article can be included, and a package can be manufactured in the same manner. In this aspect, in particular, it may be a package using the oil-resistant breathable packaging material 1 according to the first embodiment on one part or one side of the bag and a film or the like having no air permeability on the other parts. . The functional article to be included may be the same as those exemplified above. According to this aspect, it is useful in that various packaging bodies that make use of the characteristics of the oil-resistant breathable packaging material 1 according to the first embodiment can be obtained.

  In the following, typical examples of the present invention will be described. The following examples are intended to illustrate the present invention and are not intended to limit the present invention.

An oil-resistant breathable packaging material according to the second embodiment of the present invention was produced. After the necessary printing such as a product logo is performed by gravure printing on one side of a polyethylene terephthalate film with a layer thickness of 12 μm, low-density polyethylene is extrusion-coated on the printed surface side to a layer thickness of 13 μm, and the vertical and horizontal intervals are Fine pores were formed by piercing a needle having a diameter of 0.3 mm at 3 mm. Each layer thus obtained is hereinafter also referred to as perforated PET and perforated PE. As a reinforcing material layer, “Warif” (trade name, registered trademark) manufactured by JX Nippon Mining & Energy Co., Ltd., product number MS8080 (weight per unit area: 30 g / m ² , intersection thickness: 75 μm, vertical web) A thickness of 40 μm and a transverse web thickness of 40 μm) were used.

  As the microporous film layer, “Porum” (trade name, manufactured by Tokuyama Corporation), which is a stretched PE microporous film containing an inorganic filler, was used, and the thickness was selected to be 35 μm. Hereinafter, the microporous film is also referred to as MPF. As an oil-resistant processing agent for microporous films, Asahi Guard AG-E070 (Asahi Glass), which is a fluorine-based oil-resistant agent, is used as an ethanol solvent, Food Plus N808 (manufactured by Yamaichi Chemical Industries). To obtain a coating solution. The concentration of the fluorine-based oil resistance agent and the wet coating amount are shown in Table 1 below. In the coating method, the above-mentioned coating solution was coated on a microporous film using a gravure printing machine.

With the porous polyethylene terephthalate layer and the porous polyethylene layer laminated, the surface of the reinforcement layer that contacts the porous polyethylene layer was subjected to corona treatment and treated with oil resistance as described above. The microporous film is simultaneously fed so that the oil-resistant processed surface is in contact with the perforated polyethylene layer, and the reinforcing material layer is simultaneously fed, and the four layers are simultaneously passed through a hot roll to produce an oil-resistant breathable packaging material. did. The welding conditions were as follows: the temperature of the hot roll was 130 ° C., the linear pressure was 200 N / cm, and the feed rate was 20 m / min. It was. It was the porous polyethylene terephthalate layer side that contacted the hot roll. The corona treatment was performed at an output of 100 W / (m ² · min.).

[Oil resistance and acid resistance evaluation test]
About the packaging material of the Example, oil resistance was evaluated. For oil resistance, the Kit value was determined according to TAPPI UM 557 “Repellency of Paper and Board to Green, Oil, and Waxes (Kit Test).

  Subsequently, acid resistance was evaluated about these packaging materials. The evaluation of acid resistance was based on standards for food hygiene law, food, additives, etc. (S34 Ministry of Health and Welfare Notification No. 370). Specifically, 4% acetic acid, which is a test method for equipment or containers and packaging made of synthetic resin mainly composed of polyethylene and polypropylene, used in contact with “foods other than fat and fatty foods and foods other than alcoholic beverages” is used. An elution test (measurement of evaporation residue) was performed on a test solution prepared using the leaching solution.

As the operation method, the side opposite to the reinforcing material layer of the packaging material test body is fixed with a jig, and 200% to 300 ml of 4% acetic acid is introduced from above, and the liquid leached at 60 ° C. is collected from the bottom. A test solution was obtained. In all cases of Examples 1 to 5, there was no leaching of the liquid to the lower part, so that the liquid remaining on the upper part after 30 minutes at 60 ° C. was used as a test solution. The test solution was taken in a platinum, quartz, or heat-resistant glass evaporating dish with a known weight previously dried at 105 ° C., and evaporated to dryness on a water bath. Subsequently, after drying at 105 degreeC for 2 hours, it stood to cool in a desiccator. After standing to cool, it weighed and calculated | required the mass difference a (mg) before and behind an evaporating dish, and calculated | required the quantity of the evaporation residue by following Formula.
Evaporation residue (μg / ml) = ((ab) × 1,000) / sample collected (ml)
Where b is the blank test value (mg) obtained for the same amount of leaching solution as the test solution.

The results are shown in Table 1 below. From Table 1, the oil-resistant breathable packaging material according to the present invention has an evaporation residue of 30 μg / ml or less as defined by the above criteria in both oil resistance test and 4% acetic acid elution residue test, and is in contact with food. It has been found that it can be used in packaging applications.

  The oil-resistant breathable packaging material according to the present invention is useful as a packaging material that comes into direct contact with foods rich in oil.

DESCRIPTION OF SYMBOLS 1 Oil-resistant breathable packaging material 5 Functional article 6 Packaging body 10 Reinforcement material layer 11 Porous polyethylene terephthalate layer 12 Porous polyethylene layer 13 Microporous film layer 40 Reticulated structure 50 Pore 60 Reticulated structure 102 Split fiber film (Vertical web)
103 Reticulated film (horizontal web)
200 Raw film 300 Raw film 402 Longitudinal uniaxially stretched multilayer polyolefin tape 403 Longitudinal uniaxially stretched multilayer polyolefin tape

Claims (10)

  Oil-resistant breathable packaging material consisting of an oil-resistant plastic film.   The oil-resistant breathable packaging material according to claim 1, wherein the plastic film is selected from a moisture-permeable waterproof film, a nonwoven fabric, and a synthetic paper.   The oil-resistant breathable packaging material according to claim 1 or 2, wherein the oil-resistant processing is performed using a fluorine-based oil-resistant processing agent. The plastic film is formed by laminating a porous polyethylene terephthalate layer, a porous polyethylene layer, a microporous film layer, and a reinforcing material layer in this order,
The surface of the microporous film layer that contacts the perforated polyethylene layer is oil-resistant.
The reinforcing material layer includes a first fiber layer composed of a plurality of first fibers arranged in the same direction, and a plurality of second fibers arranged in a direction different from the first fiber and in the same direction. A reticulated structure comprising a second fiber layer made of the above fibers, wherein the first fiber layer and the second fiber layer are laminated or woven. The oil-resistant breathable packaging material according to any one of 1 to 3. The network structure is
(1) A non-woven fabric obtained by laminating a split fiber film obtained by splitting a longitudinally uniaxially stretched multi-layer polyolefin film and then widening the stretched film so that the stretch directions are substantially orthogonal;
(2) obtained by splitting a longitudinally uniaxially stretched multilayer polyolefin film, then splitting the resulting fiberglass film and expanding the multilayered polyolefin film, and forming a slit in the widthwise direction and then uniaxially stretching in the lateral direction. A nonwoven fabric obtained by laminating a net-like film so that the stretching direction is substantially orthogonal,
(3) A nonwoven fabric or a woven fabric formed by laminating a uniaxially stretched multilayer polyolefin tape in the longitudinal direction,
(4) A nonwoven fabric obtained by laminating a uniaxially stretched network film comprising trunk fibers extending in parallel to each other and branch fibers that connect adjacent trunk fibers, and a longitudinally uniaxially stretched multilayer polyolefin tape group layer,
(5) A uniaxially stretched network film comprising trunk fibers extending in parallel to each other and branch fibers that connect adjacent trunk fibers, and a longitudinal direction that is oblique to the stretching direction of the uniaxially stretched network film and that extends parallel to each other A first longitudinally uniaxially stretched multilayer polyolefin tape group composed of a uniaxially stretched multilayer polyolefin tape group, and a slanting direction from the opposite direction of the first longitudinally uniaxially stretched multilayer polyolefin tape group layer to the stretching direction of the uniaxially stretched network film. 5, including any one of a nonwoven fabric formed by laminating a second longitudinally uniaxially stretched multilayer polyolefin tape group composed of a second longitudinally uniaxially stretched multilayer polyolefin tape group that intersects and extends parallel to each other. The oil-resistant breathable packaging material described.   The oil-resistant breathable packaging material according to any one of claims 1 to 5, wherein the kit value is 7 to 12. Providing an oil resistance agent on at least one surface of the microporous film layer to form an oil resistant processed microporous film layer;
A step of laminating a perforated polyethylene terephthalate layer, a perforated polyethylene layer, the oil-resistant processed microporous film layer, and a reinforcing material layer in this order;
A method for producing an oil-resistant breathable packaging material comprising a step of thermocompression-bonding the laminate obtained by the step,
The oil-resistant processed surface of the oil-resistant processed microporous film layer is in contact with the porous polyethylene layer,
The reinforcing material layer includes a first fiber layer composed of a plurality of first fibers arranged in the same direction, and a plurality of second fibers arranged in a direction different from the first fiber and in the same direction. A method for producing an oil-resistant breathable packaging material, wherein the second fiber layer made of the above fiber is a network structure formed by being laminated or woven.   The oil-resistant breathable packaging material according to any one of claims 1 to 6 is used at least in part, and a deoxidizer, a desiccant, a freshness-keeping agent, a heat generating agent, a hygroscopic agent, a deodorant, an insect repellent, a dehumidifying agent Package containing fragrance.   The oil-resistant breathable packaging material according to claim 4 or 5 is used at least in part, with the perforated polyethylene terephthalate layer on the outside, an oxygen scavenger, a desiccant, a freshness-keeping agent, a heat generating agent, a hygroscopic agent, a deodorant A package containing an insecticide, insect repellent, dehumidifier or fragrance. An oil-resistant breathable packaging material using at least a part of the oil-resistant breathable packaging material according to any one of claims 4 and 5, with the reinforcing material layer facing inward so that both ends of the reinforcing material layer face each other. A process of making a bag,
A step of storing an oxygen scavenger, a desiccant, a freshness-keeping agent, a heat generating agent, a moisture absorbent, a deodorant, an insect repellent, a dehumidifier, or a fragrance in the bag-like oil-resistant breathable packaging material;
And a step of heat-sealing three peripheral edges of the bag-like oil-resistant air-permeable packaging material by a hot press method.

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