JP6834078B2 - Absorbent article - Google Patents

Description

The present invention relates to absorbent articles such as water-decomposable light incontinence liners and light incontinence pads.

Generally, an absorbent article is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between the top sheet and the back sheet, whereby urine and blood are formed. The body fluids such as are absorbed by the absorber through the top sheet. There are various absorbable articles depending on the amount of body fluid discharged under the assumed usage conditions. Of these, light incontinence liners, light incontinence pads, and the like are known to absorb a relatively small amount of body fluid.

By the way, in the light incontinence liner and the light incontinence pad, a product made of a water-decomposable material is also known. These water-decomposable absorbent articles can also be disposed of in the toilet after use, and have the advantage of easy post-treatment after use. Examples of such a water-decomposable absorbent article include, in Patent Document 1, an absorbent article having a top sheet, a back sheet, and an absorber interposed between the top sheet and the back sheet. , The top sheet and the back sheet are bonded in a discontinuous bonding pattern by thermal bonding means in the main absorption region of the absorbent article, and the absorber and the top sheet are bonded in a discontinuous bonding pattern in this absorption region. Disclosed are hydrolyzable absorbent articles in which the area of the entire site joined by is 1% to 50% of this absorption region.

JP-A-2002-035026

However, in such a water-decomposable absorbent article, there is a problem that the body fluid is easily transmitted through the absorber, the top sheet, the back sheet and the like, and the body fluid is likely to leak. In particular, if the absorber can absorb the body fluid quickly, the body fluid reaches the back sheet in a short time after the start of absorption of the body fluid, so that the absorbed body fluid may disintegrate the back sheet and wet the underwear or the like. there were. Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide an absorbent article that is hydrolyzable and does not easily leak body fluid.

The inventor of the present invention has conducted diligent research in view of the above problems. As a result, in an absorbent article having a top sheet, a back sheet, and an absorber arranged between the top sheet and the back sheet, the back sheet is hydrolyzable on the body side surface by size pressing. The above problem can be solved by sandwiching the absorber with the semi-hydrolyzable opening polyvinyl alcohol film on the body side and the semi-hydrolyzable polyvinyl alcohol film on the clothing side while being composed of the spunlace non-woven fabric of. The present invention has been completed. Specifically, the present invention provides the following.

(1) The first aspect of the present invention is a water-decomposable light incontinence absorbent article having a top sheet, a back sheet, and an absorber arranged between the top sheet and the back sheet. The top sheet is formed of a water-decomposable spunlace non-woven fabric, the backsheet is formed of a water-decomposable spunlace non-woven material whose surface on the body side is subjected to a size press treatment, and the absorber is of the absorber. a semi-water-degradable opening polyvinyl alcohol film disposed in contact with the body-facing surface, the absorbent body and the polyvinyl alcohol film of semi-disintegrable which are arranged in contact with the garment facing surface of, are held between the semi The water-decomposable opening polyvinyl alcohol film has irregularities having a wavy cross section parallel to the longitudinal direction, and a plurality of openings are provided along the top of the convex portion on the body side surface of the opening polyvinyl alcohol film. It is a hydrolyzable absorbent article for light incontinence.

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(3) A third aspect of the present invention is the absorbent article according to (1) or (2), wherein the absorber contains an absorbent fiber and a highly absorbent polymer, and the absorbent fiber and the highly absorbent polymer are contained. It is characterized in that the density of the sex polymer is 0.03 g / cm ³ or more and 0.09 g / cm ³ or less.

(4) A fourth aspect of the present invention is the absorbent article according to any one of (1) to (3), which is a top sheet, a back sheet, an absorber, an open polyvinyl alcohol film, and a polyvinyl alcohol film. However, the ease of unraveling according to JIS P 4501 is 100 seconds or less.

In the absorbent article of the present invention, since the back sheet is made of a water-decomposable spunlace non-woven fabric whose surface on the body side is size-pressed, the back sheet has water resistance on the surface on the body side in contact with the excreted body fluid. Even if the body fluid imparted and absorbed by the absorber reaches the back sheet, it is possible to prevent the back sheet from collapsing and the underwear from getting wet. On the other hand, the clothing side surface of the back sheet is not size-pressed, so when it is discarded in the toilet, the back sheet can be easily disintegrated from the clothing side surface of the back sheet that comes into contact with the wash water of the toilet. Can be done. Further, in the present invention, since the absorber is sandwiched between the semi-hydrophilic opening polyvinyl alcohol film on the body side and the semi-hydrophilic polyvinyl alcohol film on the clothing side, the body fluid that has permeated the top sheet is While being temporarily held by the opening polyvinyl alcohol film, contact between the body fluid absorbed by the absorber and the back sheet is also prevented by the polyvinyl alcohol film, so that gentle absorption of the body fluid into the absorber is ensured. , A large amount of body fluid does not reach the backsheet and cause the backsheet to collapse. Therefore, it is possible to effectively prevent the leakage of body fluid while using the absorbent article as a water-decomposable material.

It is a drawing which shows the cross-sectional schematic diagram of the absorbent article of this invention. It is a drawing which shows typically the opening polyvinyl alcohol film arranged between the top sheet and an absorber.

Hereinafter, the present invention will be described in detail with reference to the drawings. In the description of this embodiment, the same elements are designated by the same reference numerals throughout. In the following description in the present specification, the body fluid refers to a liquid excreted from the body such as urine, blood, and water in loose stool. Further, the term “when the absorbent article 1 is worn” means at least one of the time when the absorbent article 1 is worn and the time after the absorbent article 1 is worn. In the description of the present specification, the longitudinal direction of the absorbent article 1 is the direction extending in front of and behind the wearer when the absorbent article 1 is worn, and the width direction of the absorbent article 1 is the longitudinal direction. The direction is lateral or orthogonal to the direction. Further, in the present specification, the body-side surface of the absorbent article 1 refers to the surface that comes into contact with the wearer's skin when the absorbent article 1 is worn, and the clothing-side surface is worn when the absorbent article 1 is worn. Refers to the surface that comes into contact with a person's clothing. In the present specification, the body side surface side of the absorbent article 1 may be referred to as an upper side, and the clothing side surface side may be referred to as a lower side.

<Absorbable article>
FIG. 1 is a drawing showing a schematic cross-sectional view of the absorbent article 1 of the present invention. The absorbent article 1 of the present invention has a top sheet 10, a back sheet 30, and an absorber 20 arranged between the top sheet 10 and the back sheet 30, and the absorber 20 is the absorber 20. It is sandwiched between a semi-hydrolyzable opening polyvinyl alcohol film 15 arranged so as to be in contact with the body side surface and a semi-hydrolyzable polyvinyl alcohol film 25 arranged so as to be in contact with the clothing side surface of the absorber 20. It is a thing.

[Top sheet]
The top sheet 10 allows body fluids to quickly pass toward the absorber 20 and is arranged so as to face the back sheet 30 with the absorber 20 interposed therebetween. Since the top sheet 10 is a sheet that comes into contact with the skin, it is composed of a base material that has a soft feel and does not irritate the skin, but on the other hand, it must have water solubility, so that it is water soluble. It is preferable to use the spunlace non-woven fabric of.

Here, the water-decomposable material will have an adverse effect on the septic tank, piping, and sewerage unless it is decomposed immediately after being dumped in water. Therefore, the hydrolyzable material needs to be dispersed into a plurality of fine fragments as soon as possible. On the other hand, the absorbent article generally needs to have a certain level of strength and durability, and it is expected that the product may be decomposed or damaged during use due to the decrease in strength. Therefore, it is necessary for the water-decomposable material used for the absorbent article to have sufficient strength and durability while maintaining the property of being easily disintegrated by this water.

In the water-decomposable spunlace non-woven fabric used in the present invention, the fibers are not heat-sealed, and the fibers are entangled by water jet treatment. For this reason, the water-decomposable spunlace non-woven fabric is dumped in water and easily disintegrates and disperses in water when an external force such as a water flow is applied, so that it can be used as a constituent material of a water-decomposable absorbent article. it can.

In the present invention, the basis weight of the top sheet 10 ^{is preferably 20 g / m 2} or more and 40 g / m ² or less, and 25 g / m ² or more and 35 g / m ² or less from the viewpoint of processability, strength and water solubility. More preferably. Lotions, antioxidants, anti-inflammatory components, pH regulators, antibacterial agents, moisturizers and the like may be applied to the top sheet 10 in order to reduce irritation to the skin. The top sheet 10 may have an hourglass shape, a substantially rectangular shape, or the like having a constriction in the center in the longitudinal direction in which the wearer's crotch is positioned, and may be slightly outward from the side edge of the absorber 20. It may be extended.

[Backsheet]
As the back sheet 30, a sheet material having a water-shielding property that prevents body fluid from leaking from the absorbent body 20 side to the outside of the absorbent article 1 is used, but the back sheet 30 may have moisture permeability to prevent stuffiness. More specifically, like the top sheet 10, a water-decomposable spunlace non-woven fabric is used, but the body fluid held in the absorber 20 easily permeates the back sheet 30 or causes the back sheet 30 to collapse. The surface of the back sheet 30 on the body side is subjected to a size press treatment so as not to cause such damage. On the other hand, since the clothing side surface of the back sheet 30 is not subjected to the size press treatment, when the absorbent article 1 is dumped into the toilet, the back sheet 30 is not subjected to the size press treatment and comes into contact with water. The backsheet 30 quickly disintegrates and disperses in water from the clothing side surface of the garment.

Here, the size press treatment refers to a treatment in which an adhesive such as starch is applied to the surface of the non-woven fabric and dried. The adhesive layer on the water-decomposable spunlace non-woven fabric protects the water-decomposable spunlace non-woven fabric from moisture in the body fluid and can maintain the water resistance of the backsheet 30. In addition to starch, a general water-soluble adhesive can be used for the size press treatment. Examples of such a water-soluble adhesive include modified starch such as cationized starch, oxidized starch and esterified starch, cationized polyvinyl alcohol and the like.

In the present invention, the basis weight of the back sheet 30 ^{is preferably 20 g / m 2} or more and 40 g / m ² or less, and 25 g / m ² or more and 35 g / m ² or less from the viewpoint of processability, strength and water solubility. More preferably. The back sheet 30 may have an hourglass shape, a substantially rectangular shape, or the like having a constriction in the center in the longitudinal direction in which the wearer's crotch is positioned, and extends slightly outward from the side edge of the absorber 20. It may be present and provided. The surface of the back sheet 30 on the clothing contact side may be provided with an adhesive layer for fixing the absorbent article 1 to underwear or the like when worn. When the absorbent article 1 has an adhesive layer, it may have a release sheet for protecting the adhesive layer, and the release sheet may be integrated with the packaging sheet of the absorbent article 1. .. The top sheet 10 and the back sheet 30 may form flaps to be fixed by an adhesive or the like at at least a part of the end portions such as the longitudinal end portion without sandwiching the absorber 20.

[Absorber]
The absorber 20 contains an absorbent fiber as a base material and a super absorbent polymer (hereinafter, also referred to as SAP). The absorbent fiber is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, diapers and urine absorbing pads. For example, fluff pulp, cotton, rayon, acetate, tissue, absorbent paper and hydrophilic fiber. Examples include rayon. Among these, it is preferable to use fluff pulp from the viewpoint of absorbability. Examples of such fluff pulp include those obtained by defibrating wood pulp, synthetic fiber, polymer fiber, non-wood pulp and the like into a cotton-like shape.

The superabsorbent polymer of the absorber 20 is not particularly limited as long as it can absorb body fluids and prevent backflow, and is a sodium polyacrylate-based polymer, a polyaspartate-based polymer, or a (starch-acrylic acid) graft. A copolymer formed from a material such as a copolymer, a (acrylic acid-vinyl alcohol) copolymer, a (isobutylene-maleic anhydride) copolymer and a saponified product thereof can be used. Among these, sodium polyacrylate is preferable from the viewpoint of the amount of absorption per weight.

In the absorber 20, the form of the absorbent fiber and SAP is preferably a form formed by mixing SAP particles in the absorbent fiber. The absorber 20 is preferably not compression-processed so that it can be easily dispersed in water. Therefore, the density of the absorbent fibers and superabsorbent polymer is preferably not more than 0.03 g / cm ³ or more 0.09 g / cm ^3, is 0.03 g / cm ³ or more 0.06 g / cm ³ or less Is more preferable. The density is calculated from the thickness, the area of the absorber, and the mass by measuring the thickness under a load of 3432 Pa using a peacock dial gauge manufactured by Ozaki Seisakusho.

The absorber 20 may be formed by laminating an upper layer absorber and a lower layer absorber. In this case, the dimensions of the upper layer absorber and the lower layer absorber in the longitudinal direction and the width direction may be larger than the dimensions of the lower layer absorber, and the dimensions of the upper layer absorber are the same as the dimensions of the lower layer absorber. The size of the upper layer absorber may be smaller than the size of the lower layer absorber.

[Aperture polyvinyl alcohol film and polyvinyl alcohol film]
In the absorbent article 1 of the present invention, the absorber 20 is in contact with the semi-hydrolyzable open polyvinyl alcohol film 15 arranged so as to be in contact with the body side surface of the absorber 20 and the clothing side surface of the absorber 20. It is sandwiched between a semi-hydrolyzable polyvinyl alcohol film 25 and the like. By adopting such a configuration, the body fluid that has passed through the top sheet 10 is temporarily held by the open polyvinyl alcohol film 15, so that the body fluid permeates the entire absorber 20 within a short time. Even in the case where there is no body fluid and the body fluid permeates the entire absorber 20, the semi-aqueous polyvinyl alcohol film 25 blocks the contact between the absorber 20 that has absorbed the body fluid and the back sheet 30. Therefore, contact between the back sheet 30 and the body fluid is suppressed, and it is possible to prevent the back sheet 30 from collapsing due to the body fluid and causing leakage of the body fluid.

The basis weight of the semi-hydrolyzable opening polyvinyl alcohol film 15 and the semi-hydrolyzable polyvinyl alcohol film 25 ^{is preferably 5 g / m 2} or more and 20 g / m ² or less, and 10 g / m ² or more and 15 g / m ² or less. Is more preferable. By setting the basis weights of the opening polyvinyl alcohol film 15 and the polyvinyl alcohol film 25 within the above range, the holding ability / blocking ability of the body fluid and the dispersibility of the film in water are well compatible.

FIG. 2 is a drawing schematically showing an open polyvinyl alcohol film 15 arranged between the top sheet 10 and the absorber 20. As shown in FIG. 2, the semi-hydrolyzable open polyvinyl alcohol film 15 has wavy cross-sectional irregularities parallel to the longitudinal direction or the width direction, and along the convex portion on the body side surface of the open polyvinyl alcohol film 15. It is preferable that a plurality of openings 151 are provided. The plurality of openings 151 are preferably arranged regularly or irregularly along the protrusions. The opening polyvinyl alcohol film 15 is provided with stepped surface wavy irregularities parallel to the longitudinal direction or the width direction, and the openings 151 are provided along the convex portions, so that the body fluid that has passed through the top sheet 10 is once released. The body fluid that is held by the recesses of the opening polyvinyl alcohol film 15 and overflows from the recesses permeates to the absorber 20 side through the openings 151. Therefore, the body fluid does not reach the absorber 20 in a short time, and the body fluid is completely blocked by the open polyvinyl alcohol film 15 to prevent lateral leakage of the body fluid.

[Easy to loosen each material]
In the absorbent article 1 of the present invention, the top sheet 10, the back sheet 30, the absorber 20, the open polyvinyl alcohol film 15, and the polyvinyl alcohol film 25 are easily loosened in accordance with JIS P 4501 in 100 seconds or less. It is preferable to have. Since these materials have the above-mentioned index of ease of loosening, the absorbent article 1 dumped in the toilet or the like quickly collapses, various materials are dispersed in water, and septic tanks, pipes, and sewerage facilities. Can be prevented from damaging the toilet.

<Manufacturing method of absorbent goods>
The method for producing the absorbent article 1 is not particularly limited, and a conventionally known method can be adopted. For example, the opening polyvinyl alcohol film 15, the polyvinyl alcohol film 25, and the absorber 20 are sandwiched between the top sheet 10 and the back sheet 30. Then, the top sheet 10 and the back sheet 30 can be manufactured by fixing them with a water-decomposable adhesive, ultrasonic embossing, high-frequency embossing, or the like over a part or the entire circumference. Finally, this may be individually wrapped in a package and then folded in three in the longitudinal direction or the like.

Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope of the invention described in the above embodiments, and various modifications or improvements to the above embodiments are made. It is clear to those skilled in the art that it is possible to add. Further, it is clear from the description of the claims that the form to which such a modification or improvement is added may be included in the technical scope of the present invention.

1 Absorbent article 10 Top sheet 15 Opening polyvinyl alcohol film 151 Opening 20 Absorbent 25 Polyvinyl alcohol film 30 Back sheet

Claims (3)

A water-decomposable light incontinence absorbent article comprising a top sheet, a back sheet, and an absorber disposed between the top sheet and the back sheet.
The top sheet is formed of a water-decomposable spunlace non-woven fabric.
The back sheet is formed of a water-decomposable spunlace non-woven fabric having a size-pressed surface on the body side.
The absorber, polyvinyl alcohol film and the semi-water-disintegrable opening polyvinyl alcohol film disposed in contact with the body-facing surface, a semi-water-disintegrable which are arranged in contact with the garment facing surface of said absorbent body the absorber And, it is sandwiched by
The semi-hydrolyzable open polyvinyl alcohol film has wavy cross-sectional irregularities parallel to the longitudinal direction.
A water-decomposable absorbent article for light incontinence , in which a plurality of openings are provided along the top of a convex portion on the body-side surface of the opening polyvinyl alcohol film. The first aspect of claim 1, wherein the absorber contains an absorbent fiber and a highly absorbent polymer, and the density of the absorbent fiber and the highly absorbent polymer is 0.03 g / cm ³ or more and 0.09 g / cm ^{3 or less.} Hydrolyzable absorbent article for light incontinence. The water-decomposable light incontinence according to claim 1 or 2, wherein the top sheet, the back sheet, the absorber, the open polyvinyl alcohol film, and the polyvinyl alcohol film have a looseness of 100 seconds or less in accordance with JIS P 4501. For absorbent articles.

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