JP2021132852A - Absorbent article - Google Patents

Abstract

To provide an absorbent article that can reduce environmental load and be readily fitted while suppressing discomfort during use.SOLUTION: An absorbent article includes: a front sheet 10 coming into contact with user's skin S and having liquid permeability; an absorber 20 for absorbing body fluid permeating through the surface sheet 10; and a back sheet 30 covering a back side of the absorber 20 to restrict body fluid from leaking. The back sheet 30 is formed by laminating a second sheet 32 formed of a plant-derived resin on a first sheet 31 formed by paper-making of plant fibers.SELECTED DRAWING: Figure 2

Description

The present invention relates to an absorbent article.

Conventionally, an absorbent article including a front surface sheet that comes into contact with the user's skin, an absorber that absorbs body fluid that has passed through the front surface sheet, and a back surface sheet that covers the back side of the absorber and regulates leakage of body fluid. Is known (see, for example, Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 8-108504 Japanese Unexamined Patent Publication No. 2004-136678

By the way, in the conventional absorbent article, the back surface sheet is composed of a moisture-permeable resin film formed of a petroleum-derived resin and a sheet in which a non-woven fabric or paper is laminated. However, petroleum-derived resins have a high risk of environmental pollution, and efforts to reduce them are required. Further, the absorbent article needs to have appropriate flexibility in order to reduce the discomfort during use, but if it is too soft, it will be rolled up when it is attached, and there will be a problem that it cannot be attached properly.

Therefore, an object of the present invention is to provide an absorbent article that can be easily worn while reducing the environmental load and suppressing discomfort during use.

In order to achieve the above object, the absorbent article of the present invention includes a surface sheet having liquid permeability that comes into contact with the skin of the user, an absorber that absorbs body fluid that has passed through the surface sheet, and the back side of the absorber. The back sheet is provided with a back sheet that covers and regulates leakage of the body fluid, and the back sheet is obtained by laminating a second sheet formed of a plant-derived resin on a first sheet formed by straining plant fibers. It is characterized by becoming.

The absorbent article of the present invention configured in this way can be easily mounted by preventing the occurrence of curling during mounting while reducing the environmental load and suppressing the discomfort during use.

FIG. 5 is a perspective view in which a part of the absorbent article of Example 1 is broken. FIG. 5 is an enlarged cross-sectional view of the absorbent article of Example 1.

Hereinafter, embodiments for carrying out the absorbent article of the present invention will be described with reference to Example 1 shown in the drawings.

(Example 1)
Hereinafter, the configuration of the absorbent article 1 of Example 1 will be described with reference to FIGS. 1 and 2.

The absorbent article 1 of Example 1 is applied to sanitary napkins, vaginal discharge sheets, incontinence pads, medical pads, disposable diapers, etc., and is attached to underwear to absorb body fluids (menstrual blood, vaginal discharge, etc.). Will be done. As shown in FIG. 1, the absorbent article 1 includes a front surface sheet 10, an absorber 20, and a back surface sheet 30.

The surface sheet 10 is a thin film member having a liquid permeability that comes into contact with the skin S of the user in the state of use of the absorbent article 1 and rapidly permeates the body fluid. The surface sheet 10 is formed of a non-woven fabric in which ultrafine fibers are entwined, a porous plastic sheet in which mesh-like holes are formed in a thin film, or the like. As the material for forming the non-woven fabric, for example, olefin-based fibers such as polyethylene and polypropylene, polyester-based and polyamide-based synthetic fibers, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

The absorber 20 is arranged between the front surface sheet 10 and the back surface sheet 30 and absorbs the body fluid that has passed through the front surface sheet 10. The absorbent body 20 is formed by laminating cotton-like pulp, absorbent paper, a super absorbent polymer, and the like. The super absorbent polymer has a function of rapidly absorbing a liquid having a weight of 50 to 100 times its own weight and gelling and holding the absorbed liquid.

The back sheet 30 is a thin film member having liquid impermeableness that comes into contact with the underwear P in the state of use of the absorbent article 1 and regulates the leakage of body fluid. In the back sheet 30, the absorber 20 is laminated to cover the back side of the absorber 20, and the peripheral edge of the back sheet 30 is bonded to the front sheet 10 by an adhesive such as hot melt or an adhesive means such as heat seal. Further, the outer surface 30a of the back sheet 30 is provided with a slip-preventing adhesive (not shown) for fixing the absorbent article 1 to the underwear P.

As shown in FIG. 2, the back surface sheet 30 of the first embodiment has a first sheet 31 arranged on the outside (underwear P side) and a first sheet 31 laminated on the first sheet 31 and located on the inside (skin S side). It is composed of a second sheet 32 in contact with the absorber 20. The back surface sheet 30 is formed by laminating the second sheet 32 on the first sheet 31 and joining them to each other by a joining means such as thermocompression bonding (heat sealing).

Further, the basis weight of the back sheet 30 is set to 10 g / m ² or more and 200 g / m ² or less, and particularly preferably 20 g / m ² or more and 80 g / m ² or less. Further, the rigidity (hardness) of the back surface sheet 30 is adjusted by adjusting the basis weight of the first sheet 31. Here, as will be described later, since the first sheet 31 has higher rigidity and is less likely to be deformed than the second sheet 32, the first sheet 31 is easier to hold the shape than the second sheet 32. Therefore, by controlling the rigidity of the back surface sheet 30 by adjusting the basis weight of the first sheet 31, the shape of the back surface sheet 30 can be secured and the back surface sheet 30 can be provided with appropriate rigidity.

The first sheet 31 is a paper material formed by straining plant fibers manually or by using a machine, so-called Japanese paper. The first sheet 31 does not have liquid impermeability. The raw material of the plant fiber forming the first sheet 31 is at least longer than wood pulp (coniferous pulp such as pine and fir, and hardwood pulp such as beech, nara and shii), and the ratio of length to width is large. It is a plant from which fiber can be extracted, such as mulberry, sansho, ganpi, rice, bamboo, bamboo grass, paper mulberry, hemp, mulberry, and reed. The first sheet 31 is obtained by heat-treating a plant such as mulberry, which is a raw material, to extract fibers, tapping the extracted fibers to make them finer, and then applying a gelling agent collected from Totoroaoi, Panicled hydrangea, etc. to the finer fibers. After adding, it is formed by straining. Since the fibers of mulberry, mitsumata, and ganpi are particularly long, it is possible to obtain a thin paper material having excellent strength. Therefore, it is desirable that the raw material of the first sheet 31 contains at least one of mulberry, mitsumata, and ganpi. The basis weight of the first sheet 31 is set to 5 g / m ² or more and 100 g / m ² or less, and particularly preferably 10 g / m ² or more and 40 g / m ² or less. Further, the first sheet 31 has lower elasticity and higher hardness than the second sheet 32.

The second sheet 32 is a liquid-impermeable resin film formed of a plant-derived resin. The second sheet 32 is, here, a plant-derived polyethylene film. The raw material of the plant-derived resin forming the second sheet 32 may be any biological resource containing carbohydrates, for example, sugar-based biomass extracted from sugar cane, tensai, sweet sorghum, etc., corn, sweet potato, etc. These include starch-based biomass extracted from cassava and the like, cellulose-based biomass extracted from sasa, poplar, pulp and the like, and fat-based biomass extracted from sunflowers, rapeseed, soybeans, coconuts and the like. The second sheet 32 is produced, for example, by fermenting a residual liquid collected from a plant such as sugar cane as a raw material to produce biomass ethanol, and using ethylene extracted from the biomass ethanol as a basic material.

The basis weight of the second sheet 32 is set to 5 g / m ² or more and 100 g / m ² or less, and particularly preferably 10 g / m ² or more and 40 g / m ² or less. Further, the second sheet 32 may have air permeability that allows air to pass through, or may have non-air permeability that blocks the passage of air. Note that the second sheet 32 if it has a breathable, moisture permeability 5000 g ^/ m 2 / 24h or less, preferably set to ^{1500g / m 2 / 24h~3500g / m} 2 / 24h. If the moisture permeability is too high, the leakage of body fluid cannot be regulated, which causes exudation.

Hereinafter, the action of the absorbent article 1 of Example 1 will be described.

When using the absorbent article 1 of the first embodiment, the user attaches the absorbent article 1 to the underwear P. Here, the absorbent article 1 is generally wrapped in an exterior film in a folded state. Therefore, the user removes the exterior film, opens the absorbent article 1 in the unfolded state shown in FIG. 1, and then makes the outer surface 30a of the back sheet 30 face the mounting position of the underwear P and provides the outer surface 30a. The slip-preventing adhesive is attached to the underwear P and attached.

On the other hand, in the absorbent article 1 of Example 1, the back surface sheet 30 is configured by laminating a second sheet 32 formed of a plant-derived resin on a first sheet 31 formed by straining plant fibers. Has been done. That is, the back surface sheet 30 is formed by joining the second sheet 32, which is a plant-derived polyethylene film, to the first sheet 31, which is Japanese paper.

Here, the plant, which is a raw material of the plant-derived resin forming the second sheet 32, absorbs carbon dioxide by photosynthesis at the growing stage. Therefore, the amount of carbon dioxide emitted when the second sheet 32 is incinerated as waste can be regarded as zero (carbon neutral). As a result, carbon dioxide emissions can be reduced as compared with the case where the second sheet 32 is formed of a petroleum-derived resin film. The first sheet 31 is a paper material (Japanese paper) formed by straining plant fibers. Therefore, it has biodegradability and is decomposed in a natural environment, so that the environmental load is low. Therefore, the environmental load caused by the absorbent article 1 can be reduced.

Further, in the back surface sheet 30, the first sheet 31 formed by straining plant fibers is laminated on the second sheet 32. Therefore, the rigidity of the back surface sheet 30 can be increased as compared with the case where the back surface sheet 30 is formed only of the synthetic resin sheet. As a result, when the absorbent article 1 is attached to the underwear P, the back surface sheet 30 can be prevented from being rolled up or broken, and can be easily attached. Further, it is possible to reduce the thickness of the back sheet 30 while maintaining the rigidity, and it is possible to suppress a feeling of strangeness during use.

Further, since the first sheet 31 is a paper material (Japanese paper) formed by straining plant fibers, it quickly softens when it is squeezed according to the movement of the user during use. Further, since the raw material of the plant fiber for forming the first sheet 31 is a plant capable of extracting fibers longer than wood pulp at least, the first sheet 31 has higher strength than so-called Western paper. It is hard to tear even if it is caught during use. As a result, it is possible to prevent the back surface sheet 30 from being damaged while giving it appropriate flexibility during use, so that it is possible to suppress a sense of discomfort during use.

Further, the back surface sheet 30 of the first embodiment is joined to the front surface sheet 10 with the second sheet 32 in contact with the absorber 20 and the first sheet 31 facing outward. That is, the outermost surface of the absorbent article 1 is covered with the first sheet 31, which is a paper (Japanese paper) formed by straining plant fibers. As a result, the user can feel the unique texture and texture of the paper (Japanese paper) formed by straining the plant fibers.

The back sheet 30 of Example 1 has a basis weight of 10 g / m ² or more and 100 g / m ² or less. If the basis weight of the back sheet 30 is ^{lower than 10 g / m 2} , the strength becomes weak, and it becomes difficult to secure the necessary strength as a product (for example, a sanitary napkin) to which the absorbent article 1 is applied. On the other hand, if the basis weight ^{exceeds 200 g / m 2} , the required texture as a product to which the absorbent article 1 is applied deteriorates. Therefore, by setting the basis weight of the back sheet 30 to 10 g / m ² or more and 100 g / m ² or less, the strength and texture required for the product to which the absorbent article 1 is applied can be ensured.

The absorbent article of the present invention has been described above based on Example 1. However, the specific configuration is not limited to this embodiment, and as long as it does not deviate from the gist of the invention according to each claim of the claims, design changes, combinations of each embodiment, and additions are made. Etc. are acceptable.

In Example 1, the back surface sheet 30 shows an example in which the second sheet 32 is brought into contact with the absorber 20 and the first sheet 31 is joined to the front surface sheet 10 with the first sheet 31 facing outward. However, it is not limited to this. As long as the rigidity of the back surface sheet 30 can be ensured, the absorbent article 1 may be joined to the front surface sheet 10 with the first sheet 31 in contact with the absorber 20 and the second sheet 32 facing outward.

Further, in Example 1, an example is shown in which the first sheet 31 and the second sheet 32 are joined by thermocompression bonding without using an adhesive, but the present invention is not limited to this. For example, the first sheet 31 and the second sheet 32 may be joined by forming a film on each of them and then adhering them to each other using an adhesive or the like. Further, the first sheet 31 may be attached during the film formation of the second sheet 32, and when the second sheet 32 is cured while being cooled, the first sheet 31 may be fixed and joined.

1 Absorbent article 10 Front sheet 20 Absorbent 30 Back sheet 31 First sheet 32 Second sheet

Claims (3)

A liquid-permeable surface sheet that comes into contact with the user's skin,
An absorber that absorbs body fluid that has passed through the surface sheet and
A back sheet on which the absorber is laminated to regulate leakage of the body fluid is provided.
The back surface sheet is an absorbent article characterized in that a second sheet formed of a plant-derived resin is laminated on a first sheet formed by straining plant fibers. In the absorbent article according to claim 1,
The back surface sheet is an absorbent article characterized in that the second sheet is in contact with the absorber and the first sheet is joined to the front surface sheet in a state of facing outward. In the absorbent article according to claim 1 or 2.
The back sheet is an absorbent article having a basis weight set to 10 g / m ² or more and 100 g / m ^{2 or less.}

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