KR101642253B1 - Absorbent article having laminated non woven fabrics - Google Patents

Abstract

The present invention relates to an absorbent article such as a disposable diaper and sanitary napkin which absorbs body fluids including urine, blood, menstrual secretions and other body exudates. The absorbent layer is composed of first and second layers different from each other, And dispersing the body fluid rapidly to provide an absorbent layer having an increased dispersing speed and dispersibility. More specifically, the absorbent layer is divided into a first layer that absorbs body fluids and a second layer that disperses body fluids. The first layer is composed of a sheet containing a superabsorbent polymer, and the second layer is laminated with a nonwoven fabric .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an absorbent article comprising two kinds of nonwoven fabrics,

The present invention relates to an absorbent article in which two types of nonwoven fabrics are laminated having a high dispersion speed and an absorbing ability.

Absorbent articles such as disposable diapers, sanitary napkins, etc. are items designed to absorb body fluids. Body fluids absorbed by the product include urine, blood, menses, and other excreta. As the absorbent product becomes more generalized for sanitary use, it is required to provide comfort, quick absorption speed and absorbency at the time of wearing. Such an absorbent product has a multi-layer structure and is disposed with a liquid permeable top sheet, an absorption distribution layer (ADL), an absorbent core, a back sheet, and the like. The topsheet quickly absorbs body fluids and transfers them to the absorbent layer, allowing for the dispersion and absorption of the liquid. Generally, the absorbent layer uses a sheet material containing a superabsorbent polymer. The backsheet serves to prevent the absorbed body fluid from contaminating the material in contact with the absorbent article and to prevent leakage of body fluids and secretions that are not absorbed.

The function of the absorbent layer in the absorbent product is very important, and it is a tendency to demand improvement of the function of absorbency, dispersibility, and absorption rate.

On the other hand, the nonwoven web is disclosed in Korean Patent Laid-Open No. 10-1989-0018242. However, the disadvantage of the function of the absorbent layer when using such a nonwoven fabric is that dispersion of body fluids is not easy. For example, in the case of a high-viscosity liquid such as a menstrual discharge, dispersion of the liquid permeated into the absorbent layer is not easy, causing menstrual discharge to remain in some areas and to reduce the fluidity of the continuously permeated liquid.

It is an object of the present invention to provide an absorbent layer in which the body fluid in the absorbent layer of the absorbent article is rapidly dispersed without staying in a partial region, and the dispersing speed and dispersibility are increased.

Another object of the present invention is to provide an absorbent product in which all the substances in an absorbable liquid phase are dispersed evenly as needed so that the absorbent layer can play an effective role in addition to the above-mentioned body fluids.

However, the technical problem to be solved by the present invention is not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

In order to solve the above problems, the present invention provides a double layer absorbent article comprising a first layer sheet and a second layer nonwoven fabric sheet,

Wherein the first layer sheet comprises at least one component selected from the group consisting of a superabsorbent polymer, pulp, a cellulose, a bicomponent fiber, and a binder,

Characterized in that said second layer nonwoven sheet comprises at least one component selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate, cellulose, and cellulose derived fibers (Rayon). can do.

In one embodiment of the present invention, the first layer sheet and the second layer nonwoven fabric sheet are adhered by a hot melt adhesive.

In another embodiment of the present invention, the hot melt adhesive is selected from the group comprising olefin based polymer, styrene block copolymer base polymer, polyamide, polyester and urethane based polymer hot melt resin .

In another embodiment of the present invention, the superabsorbent polymer is selected from the group consisting of Acrylic Acid Polymer Sodium Salt, Silicon dioxide, Sodium polyacrylate cross-linked .

The present invention also provides a method of making a dual layer absorbent article comprising a first layer sheet and a second layer nonwoven sheet comprising the steps of:

a) forming a web by mixing at least one component selected from the group consisting of a superabsorbent polymer, pulp, a cellulose, and a bicomponent fiber;

b) preparing the web formed in the step a) by bonding with a binder;

c) completing the first layer sheet of the absorbent product by applying hot air at a temperature of 130 to 160 ° C to the web prepared in step b);

d) mixing at least one component selected from the group consisting of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) and cellulose (Cotton) or cellulose derived fiber (Rayon) ;

e) preparing a second layer nonwoven sheet of the absorbent article using the web formed in step d) using an air through method, a spunbond method, a thermal bond (point bond) method, a meltblown or a spunlaced method; And

f) applying a hot melt adhesive to the first or second layer nonwoven fabric sheet, and pressing the resultant sheet using a roll.

In one embodiment of the present invention, the hot melt adhesive is characterized in that the hot melt adhesive is selected from the group consisting of an olefin based polymer, a styrene block copolymer base polymer, a polyamide, a polyester and a urethane base polymer based hot melt resin .

In another embodiment of the present invention, the superabsorbent polymer is selected from the group consisting of Acrylic Acid Polymer Sodium Salt, Silicon Dioxide, Sodium Polyacrylate Cross-linked .

In another embodiment of the present invention, the basis weight of the first layer sheet is selected in the range of 50 g / m ² to 200 g / m ² .

In still another embodiment of the present invention, the basis weight of the second layer nonwoven fabric sheet is selected in the range of 15 g / m ² to 80 g / m ² .

In another embodiment of the present invention, the second layer nonwoven fabric sheet produced by the air-through method in the step e) is characterized by a range of 20 g / m ² to 55 g / m ² .

In another embodiment of the present invention, the second layer nonwoven fabric sheet produced by the spunbond method in step e) is characterized in that it ranges from 13 g / m ² to 40 g / m ² .

In yet another embodiment of the present invention, the second layer nonwoven fabric sheet produced using the thermal bond (point bond) method in step e) is characterized by a range of 13 g / m ² to 40 g / m ² .

According to the present invention, first, there is an effect that the body fluid in the absorbent layer of the absorbent article product does not stay in a partial area, but the liquid is quickly dispersed and absorbed evenly.

Secondly, the dispersion effect is increased and the absorption rate of the whole body fluid is also increased.

Third, in addition to the above-mentioned body fluids, all the substances in the absorbable liquid phase are dispersed evenly as needed, so that the absorption layer plays an effective role.

1 is a diagram showing a stereoscopic view of an absorbent product of the present invention.
2 is a view showing the shape of the absorbent product of the present invention.
3 is a view schematically showing a step of producing the absorbent product of the present invention.
Description of Reference Numerals to Major Parts in the Drawings
1: Sheet containing pulp sheet or superabsorbent polymer
2: spun lace, air through, spun bond, thermal bond (point bond), melt-blown nonwoven fabric
3: Hot melt adhesive
4: sheet containing pulp sheet or superabsorbent polymer
5: spun lace, air through, spun bond, thermal bond (point bond), melt-blown nonwoven fabric

The present invention relates to an absorbent layer for absorbent articles such as disposable diapers, sanitary napkins, etc. that absorb body fluids including urine, blood, menstrual secretions and other feces. More specifically, the present invention relates to a nonwoven sheet having a double layer, wherein the first layer absorbs body fluids and the second layer disperses absorbed body fluids.

The nonwoven fabric sheet of the present invention is disposable, and is specified to be discarded after one use. As shown in Fig. 1, the absorbent layer of the present invention is divided into a first layer that absorbs body fluids and a second layer that disperses body fluids. The first layer is composed of a sheet containing pulp as a main component and the sheet containing a superabsorbent polymer, and the second layer is laminated with a nonwoven fabric. The surface of the first layer of the absorbent layer and the surface of the second layer are positioned to face each other. When the second layer and the body fluid are brought into contact with each other, the primary fluid moves through the nonwoven fabric cavity. Secondarily, the capillary phenomenon causes the body fluid to be uniformly dispersed along the fibers in the nonwoven fabric. Thereafter, when the dispersed body fluids come into contact with the nonwoven fabric sheet of the first layer, the body fluid dispersed in the second layer is evenly absorbed, so that the effect of absorbing speed and absorption ability can be expressed more rapidly.

That is, the present invention relates to a double layer absorbent article comprising a first layer sheet and a second layer nonwoven sheet,

Wherein the first layer sheet comprises at least one component selected from the group consisting of a superabsorbent polymer, pulp, a cellulose, a bicomponent fiber, and a latex (binder)

Characterized in that said second layer nonwoven sheet comprises at least one component selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate, cellulose, and cellulose derived fibers (Rayon). do.

The present invention also provides a method of making a dual layer absorbent article comprising a first layer sheet and a second layer nonwoven sheet comprising the steps of:

a) mixing at least one component selected from the group consisting of a superabsorbent polymer, a pulp, a cellulose, and a bicomponent fiber;

b) preparing the web formed in the step a) by bonding with a binder;

c) completing the first layer sheet of the absorbent product by applying hot air at a temperature of 130 to 160 ° C to the web prepared in step b);

d) mixing at least one component selected from the group consisting of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) and cellulose (Cotton) or cellulose derived fiber (Rayon) ;

e) preparing a second layer nonwoven sheet of the absorbent article using the web formed in step d) using an air through method, a spunbond method, a thermal bond (point bond) method, and a spunlace method; And

f) applying a hot melt adhesive to the first or second layer nonwoven fabric sheet, and pressing the resultant sheet using a roll.

The orientation of the first layer and the second layer depends on the direction in which the surface of the first layer and the surface of the second layer are bonded.

The first layer may be composed of a sheet containing a superabsorbent polymer in order to absorb body fluids. The material is composed of a superabsorbent polymer, a pulp, a cellulose, etc. The ratio of the superabsorbent polymer to the sheet may be different depending on the application. The web includes a nonwoven fabric formed by Air-laid M & J method and Dan web method.

The high-absorptive polymer may be selected from the group consisting of Acrylic Acid Polymer Sodium Salt, Silicon Dioxide and Sodium Polyacrylate Cross-linked Sodium Polyacrylate, preferably sodium polyacrylate. It is not limited.

The basis weight of the first layer sheet may typically range from about 50 g / m ² to about 200 g / m ² .

The first layer is located at the bottom of the absorption transfer layer and the adhesive is applied to the lower surface of the second layer to laminate with the first layer. In general, a hot-melt adhesive is used to adhere the first layer and the second layer.

The second layer may be composed of a nonwoven material in order to disperse body fluids. The nonwoven fabric is used as a material including polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) and cellulose (Cotton) or cellulose derived fiber (Rayon), and the web is spun lace, air through, spunbond, A thermal bond (point bond), and a melt-blown method.

The second layer basis weight of a nonwoven fabric sheet is typically may be about 15g / m ² to about a range of 80g / m ^2, wherein the e) when using an air-through method at step 20g / m ² to 55g / m ^2, spun bond M ² to 40 g / m ² when using the thermal bond (point bond) method, but not limited to the range of 13 g / m ² to 40 g / m ² .

An adhesive is applied to the lower surface of the second layer to laminate with the first layer. In general, a hot-melt adhesive is used to adhere the first layer and the second layer.

In addition to the above-mentioned items, the hot melt adhesive application surface is applicable to both the first layer sheet and the second layer nonwoven fabric sheet, and the roll is used to pressurize the first layer and the second layer.

The hot melt adhesive used may be an olefin based polymer, a styrene block copolymer base polymer, a polyamide, a polyester, a urethane base polymer based high temperature molten resin, and the like, but not limited to, various known hot melt adhesives Can be used.

If the absorbent body is divided into the first layer and the second layer, it is possible to facilitate the dispersion of the body fluid in the absorbent body, thereby increasing the absorption rate and absorption capacity.

On the other hand, not only body fluids, but also all substances in an absorbable liquid phase can be applied to the absorbent layer as required.

Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following examples are provided only for the purpose of easier understanding of the present invention, and the present invention is not limited by the following examples.

[ Example ]

Example  1. Preparation of first layer sheet consisting of pulp components (1)

The first layer of the present invention used pulp, bi-component fiber, and Styren-Butadien-Rubber series latex was used as a material to prevent fine dust generation and to serve as a binder. The pulp acts to absorb body fluids, and the bifunctional fibers play a role in holding pulp to form a web. The latex binder is sprayed on the surface of the web by spraying on the surface of the web to prevent fine dust, and then the latex is pre-bonded by the hot air of the dryer, and the binary fibers between the pulps are melted to fix the pulp Respectively.

For the formation of the web, each material was separated using an air-laying method. The air flow method is divided into machine elements, which are independently developed by each company and are developed by Honshu method, Blow method, Dan-Web method, M & J method, J & ) Method, the Kimberly-Clarke (KC) method, and the Scott method. In the present invention, webs are laminated using the M & J method.

The adhesion of the web was formed by the thermal and chemical bonding mentioned above, and the web was bonded using hot hot air and latex. A nonwoven fabric having a basic pulp sheet weight of 113 g / m ² was obtained.

Example  2. Production of second layer nonwoven fabric

The material used for the second layer of the present invention was polyethylene and polypropylene (PE / PP) eccentric raw materials as the two-component fibers. A nonwoven fabric having a fiber diameter of 5de and a basis weight of 50 g / m ² was obtained.

The web is formed by combing the bundles of fibers in one direction by a carding method to form a thin sheet-like web. This was carried out using a machine using a rotary cylinder equipped with a tight cloth.

As the bonding of the web, spun lace, air through, spun bond, thermal bond (point bond) and melt-blown method can be used. In this embodiment, however, web bonding is performed using air through.

Example  3. Fabrication of Absorbent Product through Lamination of First Layer Pulp Sheet and Second Layer Nonwoven Sheet

Prior to laminating the pulp sheet and the nonwoven fabric, the respective surfaces should be positioned in contact with each other, and a hot melt should be applied to one of the two surfaces. The application surface of the hot melt adhesive may be either a pulp sheet or a nonwoven fabric. The application amount and the application area vary depending on the size of the application surface. In the present invention, the hot melt adhesive is applied to the surface of the second layer nonwoven fabric.

The hot melt adhesive used may be an olefin based polymer, a styrene block copolymer base polymer, a polyamide, a polyester, a urethane base polymer based high temperature molten resin, and the like, but not limited to, various known hot melt adhesives But Styren-Butadiene-Rubber series latex is used in this embodiment. The latex application amount is 5 g / m ² .

After applying the hot melt adhesive, the laminated structure of the pulp sheet / nonwoven fabric was squeezed by a physical method in order to increase the bonding strength of the adhesive. In this embodiment, a press forming method using a roll was used.

The nonwoven fabric manufactured in this embodiment can be used in the form of a roll, which is shown in Fig.

Example  4. Preparation of a first layer sheet consisting of a superabsorbent polymer and pulp (1)

In Example 1, the material used for the first layer was adjusted to use a superabsorbent polymer, pulp, bi-component fiber, and since the superabsorbent polymer had a higher absorption capacity than the pulp, . Other conditions were the same as in Example 1, and a nonwoven fabric having a basis weight of 175 g / m ² was obtained. Thereafter, the nonwoven fabric was produced and lapped in the order of Example 2 and Example 3.

The steps of producing the absorbent product of the present invention are shown schematically in Fig.

Example  5. Production of first layer sheet made of pulp (2)

In Example 1, pulp and cellulose were used to adjust the material used for the first layer. The formation of the web was performed by using the Dan Web method in the air-laying method, Respectively. The upper and lower tissues in which the pulp is placed between the upper and lower tissues and pulp are passed between the calender rolls in the form of a pin and are joined by heat and pressure to complete the sheet. A nonwoven fabric having a basis weight of 90 g / m ² was obtained. Thereafter, the nonwoven fabric was produced and lapped in the order of Example 2 and Example 3.

Example  6. Production of a first layer sheet composed of a superabsorbent polymer and pulp (2)

In Example 5, the material used for the first layer was adjusted to use a superabsorbent polymer, pulp, or cellulose, and the superabsorbent polymer had a higher absorption capacity than the pulp, thereby enhancing the function of the sheet do. The formation of the web was achieved by using the Dan Web method among the air-laying methods. The other conditions were the same as in Example 5, and a nonwoven fabric having a basis weight of 195 g / m ² was obtained. Thereafter, the nonwoven fabric was produced and lapped in the order of Example 2 and Example 3.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the embodiments and experiments described above are illustrative in all aspects and not restrictive.

Claims (13)

delete delete delete delete A method of making a dual layer absorbent article comprising a first layer sheet and a second layer nonwoven sheet comprising the steps of:
a) forming a web by mixing at least one component selected from the group consisting of a superabsorbent polymer, pulp, a cellulose, and a bicomponent fiber;
b) preparing the web formed in the step a) by bonding with a binder;
c) completing the first layer sheet of the absorbent product by applying hot air at a temperature of 130 to 160 ° C to the web prepared in step b);
d) mixing at least one component selected from the group consisting of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) and cellulose (Cotton) or cellulose derived fiber (Rayon) ;
e) preparing a second layer nonwoven sheet of the absorbent article using the web formed in step d) using an air through method, a spunbond method, a thermal bond (point bond) method, a meltblown or a spunlaced method; And
f) applying a hot melt adhesive to the first or second layer nonwoven fabric sheet, and pressing the resultant sheet using a roll.
6. The method of claim 5,
Wherein the hot melt adhesive is selected from the group consisting of an olefin based polymer, a styrene block copolymer base polymer, a polyamide, a polyester, and a urethane based polymer hot melt resin.
6. The method of claim 5,
Wherein the superabsorbent polymer is selected from the group consisting of Acrylic Acid Polymer Sodium Salt, Silicon Dioxide, and Sodium Polyacrylate Cross-Linked.
6. The method of claim 5,
Wherein the web forming method in the step a) is a spun lace method, an air through method, a spun bond method, a thermal bond (point bond) method, or a melt-blown method.
6. The method of claim 5,
Wherein the basis weight of the first layer sheet is selected in the range of 50 g / m ² to 200 g / m ² .
6. The method of claim 5,
Wherein the basis weight of said second layer nonwoven sheet is selected in the range of 15 g / m ² to 80 g / m ² .
6. The method of claim 5,
Wherein the second layer nonwoven fabric sheet produced using the air through method in step e) is in the range of 20 g / m ² to 55 g / m ² .
6. The method of claim 5,
Wherein the second layer nonwoven fabric sheet prepared using the spunbond method in step e) is in the range of 13 g / m ² to 40 g / m ² .
6. The method of claim 5,
Wherein the second layer nonwoven fabric sheet prepared using the thermal bond (point bond) method in step e) is in the range of 13 g / m ² to 40 g / m ² .

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