JP6969054B2 - Absorbent article - Google Patents

Description

The present invention relates to an absorbent article.

Generally, an absorbent article is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body arranged between the top sheet and the back sheet, whereby urine and the like can be treated. The body fluid is absorbed by the absorber through the top sheet. This absorbent article has various absorption amounts depending on the amount of body fluid discharged under the assumed usage conditions. Among 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 being easy to post-treat after use. Examples of such an absorbent article as a water-decomposable 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 in this absorption region, the absorber and the top sheet are bonded in a discontinuous bonding pattern. Disclosed are hydrolyzable absorbent articles in which the total area of the sites joined in is 1% to 50% of this absorbent region.

Japanese Unexamined Patent Publication No. 2002-035026

However, the conventional absorbent articles including the absorbent articles described in Patent Document 1 do not always have sufficient dispersibility / water solubility when disposed of in the toilet, and may cause clogging of the toilet. .. On the other hand, when the absorbent article is composed of only a material having good water decomposability, the absorbent article may absorb the body fluid and then wet the clothes. Therefore, the present invention has been made in view of the above problems, and provides an absorbent article having better dispersibility / water solubility in water and which can effectively prevent body fluids from wetting clothes. The purpose is.

The inventors of the present invention have conducted diligent research in order to solve the above problems. As a result, it is a kite-shaped absorbent article in which the absorber and the top sheet are made of a predetermined crepe paper, and the liquid-impermeable back sheet is detachably joined to the top sheet via a water-soluble binder. We have found that the above-mentioned problems can be solved by the absorbent article, and have completed the present invention. Specifically, the present invention provides the following.

(1) The first aspect of the present invention is a kite-shaped shape having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between the top sheet and the back sheet. The absorbent body is made of a laminate of a plurality of water-decomposable crepe papers, the top sheet is made of a water-decomposable crepe paper containing water-soluble polymer fibers, and the back sheet is. , The top sheet is removably bonded via a water-soluble binder, and the result of the JIS P 4501 looseness test of the water-decomposable crepe paper constituting the absorber and the top sheet is within 100 seconds. It is characterized by that.

(2) The second aspect of the present invention is the absorbent article according to (1), wherein the hydrolyzable crepe paper constituting the absorber has a basis weight of 16 g / m ² or more and 23 g / m ² or less. It is characterized by being.

(3) A third aspect of the present invention is the absorbent article according to (1) or (2), wherein the hydrolyzable crepe paper constituting the absorber is embossed. It is a thing.

(4) The fourth aspect of the present invention is the absorbent article according to any one of (1) to (3), wherein the water-soluble polymer fiber contained in the top sheet is carboxymethyl cellulose or polyvinyl alcohol. It is characterized by that.

(5) The fifth aspect of the present invention is the absorbent article according to any one of (1) to (4), wherein the basis weight of the top sheet is 30 g / m ² or more and 50 g / m ² or less. It is characterized by being.

(6) The sixth aspect of the present invention is the absorbent article according to any one of (1) to (5), in which a knob is provided at least at one end of the absorbent article at a site attached to the back sheet. It is characterized by having.

In the absorbent article of the present invention, the absorbent body and the top sheet are made of crepe paper having a predetermined looseness, and the liquid-impermeable back sheet can be peeled off from the top sheet. If the back sheet is peeled off after absorption, the absorbent article will be quickly dispersed / hydrolyzed in water even when it is disposed of in a toilet or the like, and the toilet will not be clogged. Further, since the back sheet is impermeable to liquid, it is possible to prevent the clothes from getting wet even when the absorber absorbs the body fluid.

It is a perspective view of the absorbent article. It is sectional drawing of the absorbent article. It is sectional drawing of the absorption article end part. It is sectional drawing of the absorption article end part.

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 means a liquid discharged from the body to the outside of 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.

<Absorbent article>
FIG. 1 is a perspective view of the absorbent article 1, and FIG. 2 is a cross-sectional view of the absorbent article 1. The absorbent article 1 of the present invention has a kite-shaped shape, is located on the body side of the absorbent body 2 made of a laminated body of a plurality of water-decomposable crepe papers 21, and is highly water-soluble. A liquid-permeable top sheet 3 made of water-decomposable crepe paper containing molecular fibers, located on the clothing side of the absorber 2, and releasably bonded via the top sheet 3 and a water-soluble binder 5. The result of the JIS P 4501 looseness test of the water-decomposable crepe paper 21 and the top sheet 3 having the liquid-impermeable back sheet 4 and constituting the absorber 2 is within 100 seconds. Since the absorbent article 1 has a kite-shaped shape, it is particularly suitable for use by men.

[Absorber]
(Water-decomposable crepe paper)
As described above, the absorber 2 is composed of a laminated body of a plurality of hydrolyzable crepe papers 21, and the laminated body plays a role of absorbing and retaining the body fluid. The water-decomposable crepe paper 21 may be made of 100% by mass of wood pulp, or may contain used paper pulp, non-wood pulp, and deinked pulp.

Further, the hydrolyzable crepe paper 21 may contain used paper pulp derived from a milk carton (milk pack) in order to reduce the environmental load. The amount of used paper pulp derived from the milk carton is preferably more than 0% by mass and 60% by mass or less, and more preferably 10% by mass or more and 50% by mass or less. Recycled paper pulp derived from milk carton is mainly made of softwood pulp and has the advantage that it is easy to improve the strength of the water-decomposable crepe paper 21, but there is a large variation in quality, and if the content ratio is too high, the quality of the product will be improved. May affect.

In the present invention, 25 parts by mass or less of deinked pulp derived from newspaper, magazine waste paper, etc. is used with respect to 100 parts by mass of recycled paper derived from NBKP (softwood bleached kraft pulp), LBKP (hardwood bleached kraft pulp), and milk carton. It can also be blended within the range of. The content of the deinked pulp is preferably more than 0% by mass and 20% by mass or less, and more preferably more than 0% by mass and 10% by mass or less. Since the deinked pulp is also used paper, the quality of the water-decomposable crepe paper 21 will vary greatly by blending it with the pulp raw material. Further, the deinked pulp usually contains a fluorescent dye, and if the content thereof exceeds 20% by mass, the water-decomposable crepe paper 21 may contain a large amount of the fluorescent dye.

(Embossing)
In the present invention, the water-decomposable crepe paper 21 used for the absorber 2 may be embossed. By embossing, a gap is formed between the laminated water-decomposable crepe papers 21 adjacent to the top and bottom, and the body fluid is held in this gap. Is improved. When embossing the water-decomposable crepe paper 21, double embossing may be performed or single embossing may be performed, but double embossing is more preferable. In the case of single embossing, in order to maintain the gap between the laminated sheets, it is desirable that the sheets are not embossed at once, but are embossed for each sheet and then laminated. Further, in order to effectively form voids between the water-decomposable crepe papers 21 adjacent to the top and bottom, the water-decomposable crepe paper 21 which has not been embossed is placed above and below the embossed water-decomposable crepe paper 21. May be arranged so that the embossed water-decomposable crepe paper 21 and the non-embossed water-decomposable crepe paper 21 are alternately laminated.

(Number of laminated water-decomposable crepe papers)
The number of laminated sheets of the water-decomposable crepe paper 21 is preferably selected appropriately within a range in which the water-decomposability and absorption performance of the absorbent article 1 are maintained in a well-balanced manner, but is preferably 6 or more and 12 or less.

(Basis weight of hydrolyzable crepe paper)
The basis weight of the water-decomposable crepe paper 21 ^{is preferably 16 g / m 2} or more and 23 g / m ² or less, and more preferably 18 g / m ² or more and 21 g / m ² or less per sheet. When the basis weight of the water-decomposable crepe paper 21 is within the above range, the water-decomposability and the absorption performance of the absorbent article 1 are maintained in a well-balanced manner.

[Top sheet]
In the absorbent article 1 of the present invention, the liquid-permeable top sheet 3 is arranged on the body side of the absorbent body 2. The top sheet 3 is made of hydrolyzable crepe paper in which water-soluble polymer fibers are mixed and extracted, and is configured so that its morphology does not easily collapse after absorbing body fluids. The basis weight of the top sheet 3 ^{is preferably 30 g / m 2} or more and 50 g / m ² or less, and more preferably 38 g / m ² or more and 42 g / m ² or less, from the viewpoint of providing sufficient strength.

As the material of the water-decomposable crepe paper constituting the top sheet 3, the content of NBKP (coniferous bleached kraft pulp) is preferably 60% by mass or more and 100% by mass or less, and 70% by mass or more and 100% by mass or less. Is more preferable. Further, the wood pulp may contain LBKP (blight-leaved bleached kraft pulp), and the content of LBKP is preferably more than 0% by mass and 40% by mass or less, more than 0% by mass and 30% by mass or less. More preferably

(Water-soluble polymer fiber)
As described above, the top sheet 3 is mixed with water-soluble polymer fibers, so that the top sheet 3 can maintain its morphology even after the top sheet 3 has absorbed the body fluid. Further, even if the top sheet 3 becomes wet due to the body fluid, it is possible to prevent the sheet from being easily torn or the fibers from falling off to contaminate the human body.

As the water-soluble polymer fiber that can be infiltrated into the top sheet 3, carboxymethyl cellulose, polyvinyl alcohol and the like can be used and is not particularly limited, but in the present invention, carboxymethyl cellulose or polyvinyl alcohol is preferably used. The blending amount of the water-soluble polymer fiber in the top sheet 3 is preferably 0.5% or more and 5.0% or less.

[Backsheet]
In the absorbent article 1 of the present invention, the liquid-impermeable back sheet 4 is arranged on the clothing side of the absorbent body 2. By arranging the back sheet 4 on the clothing side of the absorber 2, it is possible to prevent the body fluid held by the absorber 2 from permeating into the clothing side of the back sheet 4 even after the absorber 2 has absorbed the body fluid. It is possible to prevent the absorbent article 1 that has absorbed the body fluid from getting the wearer's clothing wet. Further, since the back sheet 4 can be peeled off from the top sheet 3, if the back sheet 4 is peeled off after absorbing the body fluid, the absorbent article 1 is quickly dispersed in water even when it is disposed of in a toilet or the like. / Do not dissolve water and cause clogging of the toilet.

For the back sheet 4, a sheet material having liquid impermeableness and water impermeability is used so that body fluid does not leak to the outside of the absorbent article 1, but even if the back sheet 4 has moisture permeability to prevent stuffiness. good. Examples of the material of the back sheet 4 having such characteristics include a thin plastic sheet such as a polyethylene sheet, polyvinyl alcohol, and a polyethylene laminated non-woven fabric. The backsheet 4 has a kite-shaped shape. The back sheet 4 may be provided so as to extend slightly outward from the side edge of the absorber 2. Further, although not shown, an adhesive layer for fixing the absorbent article 1 to underwear or the like when worn is provided on the surface of the back sheet 4 on the clothing contact side, and the release sheet is fixed to the adhesive layer. And the adhesive layer is protected.

(Water-soluble binder)
The backsheet 4 is detachably bonded to the topsheet 3 via a water-soluble binder 5, and the liquid-impermeable backsheet 4 can be detached from the topsheet 3 when the body fluid is absorbed. If the back sheet 4 is peeled off after absorbing the body fluid, the absorbent article 1 is rapidly dispersed / dissolved in water even when it is disposed of in a toilet or the like, and the toilet is not clogged. The absorber 2 may also be detachably bonded to the back sheet 4 via the water-soluble binder 5. As the water-soluble binder 5 that can be used in the present invention, a binder containing at least one kind of polyvinyl alcohol, carboxymethyl cellulose, sodium carboxymethyl cellulose salt and the like is preferable.
Further, a cationic agent such as PolyDADMAC may be added as a fixing agent.

(Picking part)
As shown in FIG. 1, the portion attached to the back sheet 4 may have a grip portion 6 at at least one end of the absorbent article 1. By having the knob portion 6, the absorbent article 1 can be easily removed from the underwear, and the back sheet 4 can be easily peeled off from the top sheet 3.
As the knob portion 6, as shown in FIG. 3 or FIG. 4, for example, a strip-shaped sheet 61 or a fold-shaped protrusion 62 can be mentioned. As an aspect thereof, as shown in FIG. 3, the strip-shaped sheet 61 described above is sandwiched between the top sheet 3 and the back sheet 4, and the end portion of the strip-shaped sheet 61 is held at the end of the top sheet 3 and the back sheet 4. As shown in FIG. 4, the fold-shaped protrusions 62 described above are held at the corresponding positions of the top sheet 3 and the back sheet 4 so as to be symmetrical in the vertical direction. Aspects are mentioned.

[Dimensions of absorbent articles]
The absorbent article 1 preferably has a kite shape having a diagonal long side of 110 mm or more and 260 mm or less and a diagonal short side of 100 mm or more and 200 mm or less. Here, when the absorbent article 1 is used, it is preferable to attach the absorbent article 1 to underwear so that the longitudinal direction of the absorbent article 1 is in the front-back direction of the body.

[Easy to unravel]
The absorbent article 1 has a JIS P 4501 looseness test result of each of the hydrolyzable crepe paper 21 and the top sheet 3 constituting the absorber 2 within 100 seconds, and has a particularly high strength outside when wet. Even if it is crepe paper, it is preferably within 80 seconds. Further, the result of the JIS P 4501 looseness test of the absorbent article 1 itself is preferably within 80 seconds per 0.3 g, more preferably within 60 seconds. When the ease of loosening satisfies the above conditions and the product weight is 6.5 g or less, when the absorbent article 1 is disposed of in the toilet, it is rapidly dispersed in water.

1 Absorbent article 2 Absorber 21 Hydrolyzable crepe paper 3 Top sheet 4 Back sheet 5 Water-soluble binder 6 Picking part 61 Picking part (strip sheet)
62 Picking part (folded protrusion)

Claims (4)

It has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between the top sheet and the back sheet.
At a site associated with the backsheet, has a knob portion on at least one end, a absorbent article kite shape to spread the knob or al fan shape,
The absorber is composed of a laminate of a plurality of sheets of water-decomposable crepe paper.
The top sheet is made of hydrolyzable crepe paper containing water-soluble polymer fibers.
The back sheet is detachably bonded to the top sheet via a water-soluble binder.
The result of the JIS P 4501 looseness test of the water-decomposable crepe paper constituting the absorber and the top sheet was within 100 seconds.
An absorbent article characterized in that the water-decomposable crepe paper constituting the absorber is embossed. The absorbent article according to claim 1, wherein the hydrolyzable crepe paper constituting the absorber has a basis weight of 16 g / m ² or more and 23 g / m ^{2 or less.} The absorbent article according to claim 1 or 2, wherein the water-soluble polymer fiber contained in the top sheet is carboxymethyl cellulose or polyvinyl alcohol. The absorbent article according to any one of claims 1 to 3, wherein the basis weight of the top sheet is 30 g / m ² or more and 50 g / m ^{2 or less.}

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