JP2007029245A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flushable absorbent article which is stably attached between labia. <P>SOLUTION: The absorbent article 1 is equipped with a surface sheet 2 being an absorbent layer 10, an absorber 4 and a reverse surface sheet 3 which is a leak preventing layer 11, is vertically long substantially, and is used by being held in a space between the labia of a female. The central part in the width direction of the absorbent layer 10 is elevated toward the side of a skin of a wearer, and the entire length is equal to or less than 12 cm. The absorbent layer 10 is separated from the leak preventing layer 11 by a water flow of a flush toilet. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an absorbent article, in particular, an absorbent article used between female labia and other small napkins.

  DESCRIPTION OF RELATED ART Conventionally, small absorbent articles, such as an interlabial pad used by being pinched | interposed into the space between female labia, are known. This type of absorbent article is worn with its skin contact surface in direct contact with the labial area, and has improved leakage resistance. Conventionally, an absorbent article that can be washed in a flush toilet has been known. This type of absorbent article has both leak-proof property and washability during use, and can be poured into a flush toilet, so that its disposal is easy. A small absorbent article such as an interlabial pad is thought to be relatively easy to realize the possibility of washing with water because its constituent members are small and the number of constituent members is small.

In addition, an interlabial pad having a structure that facilitates reliable and hygienic wearing between female labia has been proposed.
For example, in Patent Literature 1, a finger insertion sinus into which a wearer's finger is inserted is formed along the longitudinal direction of the antibody side surface, and the opening of the finger insertion sinus is the surface of the antibody side surface. A finger insertion opening that directly secures an opening in the finger width direction in the direction, and the finger insertion opening is a portion on the side of the body that is in contact with a predetermined position between the labia of the wearer The fingertip of the wearer is guided to a part (finger contact point) of the side opposite to the body corresponding to the contact point), and is inserted into the finger insertion sinus in the vicinity of the finger contact point. An interlabial pad is disclosed in which a finger insertion restricting portion that restricts the progress of finger insertion from the mouth is provided.

  In addition, there has been proposed an absorbent article in which the absorbent article is easily dispersed in a sufficiently small portion so that the used absorbent article is not clogged when it is poured into a flush toilet.

  For example, Patent Literature 2 discloses a wet-laid open fiber that is a water-dispersible and washable absorbent article, which is a liquid-permeable top sheet, and preferably contains a temporary wet strong resin therein. The topsheet also has a body surface comprising a plurality of fibrils, the fibril being a liquid permeable topsheet comprising a water resistant resinous material, a backsheet impermeable to body fluids. Preferably a wet-laid fibrous assembly including a temporary wet strength resin therein, wherein the backsheet body surface is coated with a water-resistant resinous material, the topsheet and the backsheet; And a means for removably bonding the absorbent article to the wearer's underwear, the topsheet and the backsheet using a water soluble adhesive Absorbent article being bonded is disclosed for at least its peripheral portion.

No. 2002-94150 JP 2000-501322 A

  Although the interlabial pad described in Patent Document 1 is securely and hygienically mounted between the labial areas, it may not be easily discarded because it does not have the ability to be washed with water. Further, the absorbent article described in Patent Document 2 is worn while being folded along the longitudinal center line so that the two parts of the backsheet on both sides of the longitudinal center line are adjacent to each other. Since the applied state is not structurally maintained, the bent state may be deformed during wearing, and liquid leakage may occur.

  Accordingly, an object of the present invention is to provide an absorbent article that is stably worn between labia of women and can be washed with water.

  The present invention, comprising an absorbent layer and a leak-proof layer, is an absorbent article used sandwiched between the labia, the central portion in the width direction of the absorbent layer is raised toward the skin side of the wearer, The total length is 12 cm or less, the absorption layer and the leak-proof layer are separated by the water flow of the flush toilet, and the components (for example, part of the absorption layer) are further separated so that the water distribution pipe is not clogged. The above-mentioned object is achieved by providing an absorbent article that is designed to be decomposed into various sizes.

  Further, the present invention is an absorbent article that includes an absorbent layer and a leak-proof layer, and is used by being sandwiched between labiums, wherein the central portion in the width direction of the absorbent layer is raised toward the wearer's skin side. The total length is 12 cm or less, the non-skin contact surface side surfaces of the leak-proof layer are partially bonded with a water-soluble adhesive, and the adhesive is dissolved by the water flow of a flush toilet, The above object has been achieved by providing an absorbent article in which the article opens in a flexible and thin planar shape.

  Furthermore, the present invention is an absorbent article that includes an absorbent layer and a leak-proof layer, and is used by being sandwiched between labia, wherein the central portion in the width direction of the absorbent layer is raised toward the skin side of the wearer. The total length is 12 cm or less, and a shape-retaining sheet is bridged between both longitudinal sides on the non-skin contact surface side of the leak-proof layer, and the shape-retaining sheet is water-degradable and / or biodegradable. And the both sides in the longitudinal direction of the shape retaining sheet and the both sides in the longitudinal direction of the leak-proof layer are bonded with a water-soluble adhesive, and the adhesive is dissolved by the water flow of the flush toilet, The above object has been achieved by providing an absorbent article in which the article opens in a flexible and thin planar shape.

  According to the absorbent article of the present invention, the absorbent article can be stably worn between labia and washed with water.

  Hereinafter, a preferred first embodiment of the absorbent article of the present invention will be described with reference to FIGS.

As shown in FIGS. 1 and 2, the absorbent article 1 of the present embodiment includes a liquid-retaining absorbent layer 10 and a liquid-impermeable leak-proof layer 11, which is substantially vertically long and has a total length. It is 12 cm or less and is used by being sandwiched between spaces between labia of women. The absorbent layer 10 in the absorbent article 1 is formed of a liquid-permeable top sheet 2 and a liquid-retaining absorbent body 4, and the leak-proof layer 11 is composed of a liquid-impermeable back sheet 3. As shown in FIGS. 1 and 2, in the absorbent article 1, the central portion in the width direction of the absorbent layer 10 is raised toward the wearer's skin.
In addition, the absorbent layer 10 and the leak-proof layer 11 in the absorbent article 1 of the present embodiment are separated from each other by the water flow of the flush toilet when the article 1 is discarded in the flush toilet after use. . In addition, although this article 1 may be often poured into a flush toilet, it may be discarded in a filth container etc., and it is not necessarily discarded in a flush toilet (hereinafter the same).
In the absorbent article 1 of the present embodiment, the top sheet 2 is a water-decomposable nonwoven fabric, the absorber 4 is also water-decomposable, and the absorbent layer 10 is water-degradable. Moreover, the back sheet 3 which is the leak-proof layer 11 is a biodegradable film.

  The absorbent article 1 according to the present embodiment will be described in detail. As shown in FIGS. 1 and 2, the central portion of the absorbent body 4 in the width direction is raised toward the wearer's skin, and between the labia of the woman. It has a shape that can be easily sandwiched in space. As shown in FIG. 3, the height of the raised portion suddenly increases from one end portion in the longitudinal direction and then decreases while gradually inclining toward the other end portion in the longitudinal direction. Thus, the protruding portion at the center in the width direction of the article 1 has an asymmetric shape in the longitudinal direction.

  Each of the top sheet 2 and the back sheet 3 in the absorbent article 1 of the present embodiment has an elliptical shape in plan view. Further, as shown in FIG. 2, the absorber 4 is sandwiched and fixed between the top sheet 2 and the back sheet 3, and the shape in plan view is an elliptical shape that is substantially similar to the top sheet 2 and the back sheet 3. It is. The surface on the non-skin contact surface side of the absorbent body 4 is preferably bonded to the back sheet 3 by applying a water-soluble adhesive in a full-surface coating pattern as shown in FIG. . When the article 1 is discarded in a flush toilet and subjected to stirring by a large amount of water, the water-soluble adhesive dissolves in water, and the adhesive state between the absorber 4 and the back sheet 3 disappears due to the adhesive. And the absorber 4 and the back surface sheet 3 are made to isolate | separate.

In the absorbent article 1 of the present embodiment, the surface sheet 2 and the back sheet 3 extend from the periphery of the absorbent body 4 as shown in FIGS. They are joined together using a heat seal as a joining means.
The water-soluble adhesive is preferably applied continuously to the peripheral edge of the article 1 from the viewpoint of maintaining a bonded state in a wet state when the absorbent article is used. The water-soluble adhesive is preferably applied to the whole including the peripheral portion, and is preferably applied at least to the peripheral portion. When the article 1 is discarded in a flush toilet and subjected to stirring by a large amount of water, the water-soluble adhesive dissolves in water, and the adhesive between the top sheet 2 and the back sheet 3 by the adhesive is used. The state disappears.

Moreover, the embossed part 6 by heat sealing, which is the physical joining part, has a short linear shape, and the adhesive is applied along the peripheral edge of the article 1 at a position inside the peripheral edge. A plurality of discontinuous areas are provided.
Specifically, in the embossed portion 6, the top sheet 2 and the back sheet 3 are partially fused as described below.
The top sheet 2 and the back sheet 3 were embossed in a dotted line shape having a length of 5 mm, a width of 1 mm, and a line spacing of 2 mm as an emboss pattern, and were pushed from the front side (at a temperature of 100 degrees or more, preferably 110 to 140 degrees). It is physically joined by an embossed portion 6 formed in a pattern.
As described above, the top sheet 2 and the back sheet 3 at the peripheral edge of the article 1 are joined by both the water-soluble adhesive and embossing (physical joining, etc.).
In this case, the physical bonding is performed by increasing the adhesion effect of the water-soluble adhesive by pressurizing the materials to each other, and penetrating the water-soluble adhesive into the nonwoven fabric as the surface sheet by pressing and heating. It is possible to obtain an absorbent article that does not separate at the time of use by increasing the adhesiveness on both sides of increasing the adhesiveness by the combined effect.
Here, in the adhesion of the peripheral portion, a water-soluble adhesive alone or a physical (for example, thermal) adhesive means alone cannot provide sufficient adhesion to withstand use, and sufficient adhesion can be achieved by using both together. It is possible to make an absorbent article that does not separate during use.
That is, since the surface sheet 2 uses a water-decomposable non-woven fabric as will be described later, in general (or as a sheet that can be preferably used), the heat-fusible property is poor. Further, as described later, a thermoplastic film is preferably used as the back sheet 3. However, in order to obtain a preferable feeling of use, it is necessary to make the thickness within a thin and soft range (thin) as described later. Do not heat seal.
As described later, various adhesives can be selected as the water-soluble adhesive, but all of them are hard and poor in surface tackiness, and it is necessary to apply a large amount in order to achieve sufficient adhesiveness alone. The part becomes hard and the feeling of use is impaired.
When both are used together, a small amount of liquid in use does not allow moisture to enter the seal part at the periphery (because it is closely attached by embossing), while a large amount of liquid penetrates from everywhere when it flows into the toilet. As a result, the water-soluble adhesive is washed away, the adhesive force between the sheets is remarkably reduced, and the seal is easily released by the force of the water flow.

When the article 1 having the above-described configuration is discarded in the flush toilet, the top sheet 2 and the back sheet 3 are first separated, and then the absorbent body 4 and the back sheet 3 are separated. . Moreover, since the absorber 4 is not joined to the surface sheet 2, the absorber 4 is separated from the surface sheet 2 after the surface sheet 2 and the back surface sheet 3 are separated.
At this time, the top sheet 2 and the back sheet 3 may be separated to such an extent that the absorbent body 4 is separated and collapsed, and thus may not be completely separated.
For example, as shown in FIG. 11, the adhesive on both sides of the back sheet 3 is a water-insoluble adhesive (portion 31 indicated by a dotted line in FIG. 11), and the adhesive at the center of the back sheet 3 is a water-soluble adhesive. When an agent (part 32 indicated by a solid line in FIG. 11) is used in combination with embossed joints on the periphery of the article 1, the embossed joints on both sides do not disintegrate, but as a result of the water flow entering from the front-rear direction, Water collapse proceeds.
In addition, even when the entire surface is made of a water-soluble adhesive, the same effect can be obtained by applying a large amount of adhesive only on both sides, or changing the embossing conditions or pattern only on both sides. Can be expressed.

The absorbent sheet 1 of the present embodiment will be further described. The top sheet 2 is a water-decomposable nonwoven fabric formed by a hydroentanglement method. After this article 1 is discarded in the flush toilet after use, and the topsheet 2 and the backsheet 3 are separated by the water flow of the flush toilet, the topsheet 2 further reaches the size of the fiber level forming the sheet. It preferably has a property of decomposing, and at least the size of each portion of the sheet after hydrolyzing is preferably decomposed to a size that does not clog a filter medium such as a septic tank. In the present specification, water degradability means a property that does not hydrolyze in a wet state during use of the absorbent article 1, but rapidly decomposes finely when discarded and stirred in a large amount of water.
On the other hand, the back sheet 3 is not leakable but is a leak-proof sheet formed of a biodegradable film. This sheet is made to flow on a water stream alone or in a state of being partially adhered to the surface sheet 2. Unlike surface sheet 2, it does not decompose immediately with water flow, but it is thin, small and soft, so there is little risk of being caught by piping. And it will biodegrade after being discharged into the environment after the septic tank.

As shown in FIG. 5, the absorbent article 1 of this embodiment is sandwiched between female labia, and the skin contact surface of the article 1 is preferably worn in close contact with the labia. The absorbent layer 10 of the article 1 is soft and flexibly deforms and abuts according to the shape of the wall between the labia. Since the ridge portion at the center in the width direction on the skin contact surface side of the article 1 is used by being arranged in the back of the space between the labia of the woman, the excreted body fluid is longitudinally along the ridge portion. The body fluid is absorbed by the entire article 1. In this article 1, the protruding portion at the center in the width direction has an asymmetric shape in the longitudinal direction, but which side of the longitudinal direction is used with the wearer's belly side or dorsal side? Is preferably selected according to the preference of each wearer.
Moreover, when using the absorbent article 1 of this embodiment, it is also preferable to use together with the normal absorbent article used by fixing to the inner side of an underwear from a viewpoint of improving the absorption performance of a bodily fluid.

The absorbent article 1 of this embodiment is sandwiched between female labia and closely contacts the wall of the labia to prevent leakage of bodily fluids, and when it is discarded in a flush toilet after use, Alternatively, from the viewpoint of preventing clogging of sewers and the like, it is preferable that the size of each of the top sheet 2 and the back sheet 3 which are each component is a size not exceeding 12 cm in length, 6 cm in width, and 0.4 cm in thickness. . The length and width are the maximum values in the longitudinal direction or the width direction of each member when the article 1 is developed in a planar shape (the same applies hereinafter). The thickness is measured under a load of 2.5 g / cm 2 by placing a measuring plate of an appropriate size, for example, using a table thickness gauge made by Peacock.
Moreover, when the absorber 4 is a thing which laminated | stacked the pulp in three-dimensional shape like this embodiment, it is preferable to decompose | disassemble into a fiber form with a water flow. In the case where the absorbent body 4 is a product in which water-degradable or biodegradable sheets are laminated, it is preferable that the size of each sheet does not exceed the sizes of the top sheet 2 and the back sheet 3.
In the present embodiment, each of the top sheet 2, the absorber 4 or the back sheet 3 is formed from only one member, but it is also preferable that each constituent member is formed from a plurality of members. Each member is preferably separated into a size not exceeding 12 cm in length and 6 cm in width by the water flow of the flush toilet as described above. In addition, these numerical values are dimensions in a state in which each constituent member of the article 1 is separated, and are not in a state in which the constituent members form the article 1.

In the absorbent article 1 of the present embodiment, the top sheet 2 is a nonwoven fabric that is entangled to the extent that a web is formed and further hydrolyzed by a hydroentanglement method.
Various known materials can be used as the material of the web, but the following are preferably formed from the following thermoplastic fibers, hydrophilic fibers, or a mixture of the two, and in particular, rayon alone or rayon is mainly used. A component obtained by mixing fibers selected from pulp, cotton, and various thermoplastic fibers is preferable from the viewpoint of being easily entangled and essentially hydrophilic and easily exhibiting absorbency. The fiber length of each fiber is 10 to 120 mm from the viewpoint of promptly water-dissolving when discarded in a flush toilet after use while the sheet is maintained in a wet state when the article 1 is used. preferable.
Specific examples of thermoplastic fibers include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, synthetic fibers made of resins such as polyamide, composite fibers thereof, and durable hydrophilizing agents for these fibers. A coated fiber or the like is preferable.
In addition, as the hydrophilic fiber, wood pulp, cellulose fiber, various regenerated cellulose fibers or fibers containing mixed fibers thereof are preferable. Wood pulp includes bleached wood pulp such as softwood bleached kraft pulp (NBKP), softwood sulfite pulp (NBSP), hardwood bleached kraft pulp (LBKP), etc. Chemically cross-linked pulp having Examples of the cellulose fiber include cotton fiber, burlap, cannabis, flax, linna, hemp, leaf fiber (Manila hemp, sisal hemp), kenaf and other annual fiber materials. Examples of the regenerated cellulose fiber include fibers obtained by a viscose method, a copper ammonia method, and an organic solvent method. For example, as described above, rayon fibers formed by the viscose method can be preferably used.
In addition to the hydrophilic and biodegradable fibers described above, it is more preferable to form a web using fibers having biodegradability described later or fibers made of a resin having biodegradability. Examples of the water-degradable sheet having biodegradability include those described in Table 97/13920.
As the water-decomposable non-woven fabric, it is also preferable to use a non-woven fabric made of the web by a chemical bond method using a water-soluble adhesive.
In addition, a sheet in which a water-soluble adhesive is applied and penetrated into a sheet formed by a nonwoven fabric by the hydroentanglement method and the bond is reinforced is also preferable. Examples of this binding reinforcing agent include those obtained by adding polyvinyl alcohol as a binding reinforcing agent, those obtained by adding polyvinyl alcohol as a binding reinforcing agent, and further impregnated with a carboxylic acid salt (aqueous solution) and dried. 3 to 0.6, pH ≧ 5 carboxymethylcellulose and / or salts thereof added as a binding reinforcing agent, etc. are raised, and these are not dissolved in water for a small amount of water as a stable binding agent When a large amount of water permeates in the flush toilet (by structural changes such as the removal of the metal cross-links of the salt), the bond is broken immediately and the water is dissolved.

  In the absorbent article 1 of the present embodiment, the back sheet 3 is preferably a biodegradable film or a film that is partially water-disintegratable. The biodegradable film is most easily handled by extruding a thermoplastic and biodegradable plastic to form a film. Preferred materials include, for example, polylactic acid resin, or 20 to 60% by mass of polylactic acid in a polyolefin. What mixed resin, or what mixed 20-40 mass% starch, starch, cellulose, and / or those powder into polyolefin, etc. are used. Other biodegradable plastics will be described later. The material is not particularly limited as a partially water-disintegrating film, but in order to disintegrate into small pieces in water, a plurality of films are partially overlapped to form a back sheet, In the overlap, it is preferable that a water-soluble pressure-sensitive adhesive or an adhesive whose adhesive strength is reduced by water is bonded alone or together with heat bonding. Further, as another preferred embodiment of the back sheet 3, a water-soluble film made by melt-extrusion of a polyvinyl alcohol (PVA) resin having a high degree of saponification, PVA, carboxymethylcellulose and / or a salt thereof was selected. Water-soluble films such as films cast from polymers (films obtained by dissolving in water and thinly coating and drying) (films that are difficult to dissolve in a small amount of water and dissolve in a large amount of water), A composite material obtained by combining the film with a water-decomposable nonwoven fabric prepared in the same manner as the top sheet 2 can be preferably used. Alternatively, a hydrophobic and water-decomposable non-woven fabric using hydrophobic fibers made of thermoplastic resin can be used as the material by the same manufacturing method as that for the top sheet 2 described above. Further, in order to increase the strength of the back sheet 3 while maintaining water disintegration, fine fibrous cellulose such as fibrillated rayon may be blended. Moreover, it is preferable to apply a wax from the viewpoint of improving the leak-proof property of the nonwoven fabric, and a biodegradable wax is particularly preferable. The wax is preferably applied to the skin contact surface side of the back sheet 3.

As other biodegradable plastics, specifically, a film formed from an aliphatic polyester, a copolymer of an aliphatic polyester and an aromatic polyester, or an aliphatic polycarbonate resin can be preferably used. . The resin includes polyethylene succinate (PES), polybutylene succinate (PBS), polyglycolic acid (PGA), polyhydroxybutyrate (PHB), polycaprolactone (PCL), polycaprolactone and polybutylene. Mixture or copolymer of succinate (PCL / PBS), copolymer of polyhydroxybutyrate and polyhydroxyvalylate (PHB / PHV), mixture or copolymer of polybutylene succinate and polybutylene adipate Resins such as (PBS / PBA), a copolymer of polyethylene terephthalate and polyethylene succinate (PET / PES), and a copolymer of polybutylene terephthalate and polybutylene adipate (PBT / PBA) are preferred.
Water-insoluble polysaccharides such as cellophane and chitosan, cellulose derivatives such as cellulose acetate, unvulcanized natural rubber, unvulcanized polyisoprene, heat-cured known shellac resin, cured lacquer, etc. Polysaccharides such as natural resins, proteins such as gelatin, polymalic acid, polyglutamic acid, polyaspartic acid and the like are also preferable.
Each said resin can be used individually or in combination of 2 or more.

  For forming a biodegradable film, a conventional film forming method such as a calendar method, a melt extrusion method, a method of evaporating a solvent or a dispersion medium after applying a resin solution or an emulsion, and the like is used. Can do.

The thickness of the biodegradable film is preferably 12 to 60 μm, and more preferably 18 to 35 μm, from the viewpoints of film strength, film handleability, and ease of biodegradability. As described above, in order to reinforce the strength of the film, it is also possible to form a leak-proof and biodegradable composite sheet by combining with a water-degradable nonwoven fabric, and the preferred thickness of the film at this time is 10 to 45 μm, It is 12-30 micrometers especially, and the preferable basic weight of a water-decomposable nonwoven fabric is 25-45 g / m < ² >, Especially 30-40.

The back sheet 3 is preferably a biodegradable paper or a biodegradable nonwoven fabric coated with wax. The wax is preferably biodegradable. Moreover, it is preferable to apply to the surface of the back sheet 3 on the skin contact surface side.
As a material for forming the biodegradable paper or the biodegradable nonwoven fabric, the same material as the water-degradable nonwoven fabric / water-degradable paper described above can be used.

  The biodegradable film, biodegradable paper or biodegradable web described above has a biodegradability (aerobic ultimate biodegradation: JIS K 6950 or 6953) of 30% or more from the point of degrading in a practical period. It is preferably 50% or more, more preferably 60% or more.

Various known waxes can be used as the biodegradable wax, but plant waxes, animal waxes, petroleum waxes and the like are preferable.
Specific examples of the plant wax include rice wax, carnauba wax, and candelilla wax. Specific examples of animal waxes include beeswax, lanolin, and whale wax. Specific examples of the petroleum wax include those having a melting point of 85 ° C. or less, such as microcrystalline wax and paraffin wax. Moreover, even if it is a synthetic wax, what has biodegradability can be used.

  In the absorbent article 1 of the present embodiment, various well-known absorbents 4 can be used as the water-decomposable absorbent body 4, but the water-decomposable fiber obtained by molding a fluff pulp or rayon web as shown in FIG. Aggregates, water-degradable paper or water-decomposable nonwoven fabric are preferred. The absorbent body 4 is preferably formed from hydrophilic fibers from the viewpoint of good absorbency, and from the viewpoint of good softness, the absorbent body 4 is formed from a bulky web made of thermoplastic fibers having a large three-dimensional crimp. It is preferable. From the viewpoint of combining good absorbency and softness, the mass ratio of the hydrophilic fiber to the thermoplastic fiber is preferably 100: 0 to 60:40. These may be mixed webs, but they may also be layered independently. For example, the web corresponding to the tip (middle and high) part pushed between the labia is the thermoplastic fiber web, and the lower layer is the hydrophilic fiber. It may be a web. In addition, the fiber length of each fiber is 6 to 120 mm from the viewpoint of quick water disintegration when the rigidity of the absorbent body 4 is maintained in a wet state when the article 1 is used and is discarded in a flush toilet after use. It is preferable that

As the hydrolytic paper for forming the absorbent body 4, various known ones can be used, which are formed by adding a water-soluble adhesive to a web containing hydrophilic fibers, hydrophobic fibers or mixed fibers of both. Etc. are preferred. When using hydrolyzed paper as the absorbent body 4, it is preferable to fold the hydrolyzed paper and raise the central portion in the width direction of the absorbent layer 10.
Examples of the hydrophilic fiber and the hydrophobic synthetic fiber that form the absorbent body 4 include the same materials as those described above as the material of the topsheet 2.
Further, various known materials can be used as the web material, but it is preferable to use the same material as the material for the hydrolytic paper.
As the water-decomposable non-woven fabric, various known materials can be used, and those formed by the chemical bond method or the hydroentanglement method are preferable. In the chemical bond method, it is preferable to use a water-soluble adhesive.
As the fiber forming the hydrolytic paper, the web or the water-decomposable nonwoven fabric, it is more preferable to use a fiber having biodegradability or a fiber made of a resin having biodegradability, which will be described later, and having hydrophilicity. Examples of the water-degradable paper or water-decomposable nonwoven fabric having biodegradability include those described in Table No. 97/13920.
Furthermore, it is also preferable to carry a predetermined amount of superabsorbent polymer from the viewpoint of improving absorbability. Specifically, from the viewpoint of fluidity after disposal in the flush toilet, it is preferable to carry the superabsorbent polymer in an amount of 0 to 33% by mass with respect to the mass of the absorber.
Various resins known to those skilled in the art can be used for the superabsorbent polymer, but considering biodegradation after being discharged into the environment,
1) Polymers based on biodegradable polymers such as starch, cellulose, carboxymethyl cellulose and their salts, and graft polymerization of acrylic acid and acrylate
2) It is insoluble in menstrual blood, urine, etc. (electrolyte solution), such as polyacrylic acid (or its salt) with low degree of crosslinking and weak gel strength, salt obtained by partially neutralizing polyacrylic acid with a small amount of polyvalent cation, etc. Synthetic polymers that are water soluble when exposed to large amounts of water
3) Polymers having high biodegradability such as superabsorbents derived from natural products such as starch, insolubilized starch, carrageenan, carboxymethylcellulose and salts thereof, natto-produced polyglutamic acid and cross-linked products thereof are particularly preferably used.

  In the absorbent article 1 of the present embodiment, various known adhesives are used as the water-soluble adhesive. For example, an anionic binder having a carboxyl group, polyvinyl alcohol, starch or a derivative thereof, sodium alginate, tant gum, Guar gum, xanthan gum, gum arabic, carrageenan, galactomannan, gelatin, casein, albumin, pull plan, polyethylene oxide, viscose, polyvinyl ethyl ether, sodium polyacrylate, sodium polymethacrylate, polyacrylamide, polyacrylic acid hydroxylation Derivatives, polyvinyl pyrrolidone / vinyl pyrrolidone vinyl acetate copolymer and the like are preferred. Examples of the anionic binder include polysaccharide derivatives, synthetic polymers, and natural products. Examples of the polysaccharide derivative include carboxymethyl cellulose (CMC) or a salt thereof, carboxyethyl cellulose or a salt thereof, carboxymethylated starch or a salt thereof, and an alkali metal salt of carboxymethyl cellulose is particularly preferable. Examples of the synthetic polymer include a salt of an unsaturated carboxylic acid polymer or copolymer, a salt of a copolymer of an unsaturated carboxylic acid and a monomer copolymerizable with the unsaturated carboxylic acid, and the like. Examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic anhydride, maleic acid, and fumaric acid. Examples of the monomer copolymerizable with these include esters of these unsaturated carboxylic acids, vinyl acetate, ethylene, acrylamide, vinyl ether and the like. Examples of natural products include xanthan gum, gellan gum, tarragant gum, and pectin. Among these, in addition to the viewpoints of water solubility and adhesive strength when wet, from the viewpoint of easy application of melt coating, such as spiral spraying, which is easy for those skilled in the art, water-soluble thermoplastics mainly composed of polyvinyl alcohol. The adhesive is preferred.

Moreover, it is also preferable to add a crosslinking agent to a water-soluble adhesive as needed. As a result of crosslinking and insolubilizing the adhesive by the crosslinking agent, the adhesive cannot be dissolved with a small amount of water. However, if discarded in a large amount of water, the insolubilized adhesive will be dissolved in water again. As the type of the crosslinking agent, an appropriate one is used according to the type of the adhesive. For example, when the adhesive is a water-soluble adhesive having a carboxyl group such as CMC described above, it is preferable to use a polyvalent metal ion as the cross-linking agent. In particular, it is preferable to use one or more metal ions selected from the group consisting of alkaline earth metals, manganese, zinc, cobalt and nickel from the viewpoints of water solubility and adhesive strength when wet. Further, when polyvinyl alcohol is used for the adhesive as described above, the same appropriate insolubilization can be achieved by the salting out effect by blending a small amount of carboxylate.
Similarly, an adhesive that is preferably used may be an adhesive that is not water-soluble but has low tack when wet.
For example, styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butylene-ethylene copolymer (SEBS), etc. as the main component (base polymer) Of adhesives containing hydrogenated petroleum resin as tackifier and paraffin oil or paraffin wax as plasticizer, plasticizer component is low / tackifier is hard, hard, and gains adhesive strength with surface tack The adhesive type is preferably used for this purpose. As an example, an adhesive having 50% by mass of SEBS, 18% by mass of a plasticizer, and 32% by mass of a tackifier is raised. When this adhesive is applied by spiral spraying or slot spraying (because it is hard), it does not easily penetrate into the material and has a weak engagement effect. However, it has a strong surface tack (so-called stickiness), so it has strong adhesion when dried. Is expressed. However, since the surface tack caused by hydrogenated petroleum resin is not wetted, the adhesive force is quickly reduced when the toilet is inserted. The preferable composition is preferably 50% by mass or less of the base polymer, 20% by mass or less of the plasticizer, and 30% by mass or more of the tackifier.

According to the absorbent article 1 of the present embodiment described above, the widthwise central portion of the absorbent layer 10 is raised toward the wearer's skin side, and the total length is 12 cm or less. It is designed to be worn by being sandwiched between them.
Moreover, since the top sheet 2 and the back sheet 3 are joined together using a water-soluble adhesive and heat seal, a sufficiently joined state is maintained in a wet state when the absorbent article 1 is used. On the other hand, when it is discarded in the flush toilet after use, it is quickly separated into the top sheet 2 and the back sheet 3.
Moreover, since each of the top sheet 2, the absorbent body 4 and the back sheet 3 has water decomposability, the top sheet 2, the absorbent body 4 and the back sheet 3 are separated into each constituent member by the water flow of the flush toilet, and then continuously decomposed.
Furthermore, when each of the top sheet 2, the absorbent body 4 and the back sheet 3 is biodegradable as well as water decomposable, it is decomposed to below the size of the fiber. In the downstream of the toilet, the proportion remaining as a solid matter is extremely small, which is more suitable for the environment.

  Next, the absorbent article 1 of 2nd-5th embodiment is demonstrated, referring FIGS. 6-10. Regarding the second to fifth embodiments, the description in detail regarding the first embodiment is applied as appropriate to points that are not particularly described. Moreover, in FIGS. 6-10, the same code | symbol is attached | subjected to the same member as FIGS.

In the absorbent article 1 according to the second preferred embodiment of the present invention, each of the top sheet 2 and the back sheet 3 is biodegradable.
Each of the top sheet 2 and the back sheet 3 in the absorbent article 1 of the present embodiment has biodegradability, and when the article 1 is discarded in the flush toilet after use, each component is caused by the water flow of the flush toilet. After the separation, each of the top sheet 2 and the back sheet 3 has a property of further biodegrading and losing its shape.

In the absorbent article 1 of the present embodiment, various known materials can be used as the material of the liquid-permeable surface sheet 2 having biodegradability, but biodegradable films, biodegradable paper, biodegradable materials can be used. A web or a biodegradable nonwoven fabric is preferred. The sheet material of the top sheet 2 is preferably provided with a plurality of holes so as to allow the body fluid to pass therethrough.
Examples of the biodegradable film, biodegradable paper, biodegradable web, or biodegradable nonwoven material described above include the same materials as those for the back sheet of the first embodiment. In addition, as a biodegradable material of the surface sheet 2, a hydrophilic fiber is also preferable.
Moreover, as a material of the leak-proof back surface sheet 3 which has biodegradability, although various well-known things can be used, the thing similar to 1st Embodiment is preferable.

According to the absorbent article 1 of the present embodiment, each of the top sheet 2 and the back sheet 3 has biodegradability and is finally decomposed to a size equal to or less than the size of the fiber. The ratio remaining as a solid matter is very small in the downstream, and it is suitable for the environment.
Even in this case, the top sheet 2 and the back sheet 3 may be completely separated as shown above, or may be partially joined.

In the absorbent article 1 according to the third preferred embodiment of the present invention, each of the top sheet 2, the absorbent body 4 and the back sheet 3 has biodegradability.
Each of the top sheet 2, the absorber 4 and the back sheet 3 in the absorbent article 1 of the present embodiment has biodegradability, and when the article 1 is discarded in the flush toilet after use, the water flow in the flush toilet After separating into each component by the above, each of the top sheet 2, the absorbent body 4 and the back sheet 3 has a property of further biodegrading and losing its shape.
In the absorbent article 1 of the present embodiment, various known materials can be used as materials for the biodegradable topsheet 2 and backsheet 3, and the same materials as those in the above-described embodiment can be used. .

In the absorbent article 1 of the present embodiment, various known materials can be used as the material of the absorbent 4 having biodegradability, such as biodegradable paper, biodegradable web, or biodegradable nonwoven fabric. Is preferred.
When biodegradable paper is used, the material is preferably formed by adding an adhesive to a web made of hydrophilic biodegradable fibers. Examples of the hydrophilic biodegradable fiber include those having the hydrophilic property among the above-described biodegradable fibers. Specifically, the cotton fiber (cotton), the material of the hydrolytic paper of the first embodiment. Various fibers described as hydrophilic fibers are used.
When a biodegradable web is used, the material is preferably formed from hydrophilic biodegradable fibers. Examples of hydrophilic biodegradable fibers include those similar to the biodegradable paper.
The biodegradable nonwoven fabric is preferably formed from the biodegradable web by a chemical bond method or a hydroentanglement method, or by a heat-fusible fiber and formed by an air-through method. In the chemical bond method, it is preferable to use an adhesive having biodegradability, and in the air-through method, it is preferable to use a heat-fusible fiber having biodegradability. Moreover, what was formed by the spunbond method using only the biodegradable synthetic fiber which has thermoplasticity is also preferable.

  According to the absorbent article 1 of the present embodiment, each of the top sheet 2, the absorbent body 4 and the back sheet 3 has biodegradability and is finally decomposed to the size of the fiber or less. The proportion remaining as a solid in the downstream of a flush toilet, etc. is extremely small, which is more suitable for the environment.

As shown in FIG. 6, the absorbent article 1 according to the fourth preferred embodiment of the present invention has a peripheral portion of the absorbent body 4 extending between the top sheet 2 and the back sheet 3, and the top sheet 2 and the back sheet 3. The peripheral edge of the absorbent body 4 is exposed on the surface of the absorbent article 1. The shape of the absorbent body 4 in plan view is substantially the same as that of the back sheet 3, and the non-skin contact surface side of the absorbent body 4 is coated with a water-soluble adhesive on the entire surface as shown in FIG. It is applied and adhered to the back sheet 3. Moreover, the peripheral part of the absorber 4 is adhere | attached continuously with the peripheral part of the surface sheet 2 with a fixed width | variety with a water-soluble adhesive.
Furthermore, the peripheral part of the absorber 4 is joined to the peripheral part of each of the top sheet 2 and the back sheet 3 by an embossed part 6 by heat sealing which is a physical joining means. The embossed part 6 by heat sealing, which is the physical joint part, has a short linear shape, and is provided along the peripheral edge of the article 1 in a discontinuous manner at a position inside the peripheral edge. . About the structure of the embossing part 6, a function, etc., it is the same as that of 1st Embodiment.

The absorbent body 4 of the absorbent article 1 in the present embodiment has water decomposability. As the material of the absorber 4, various known materials can be used, and the same materials as those in the first embodiment can be used.
According to the absorbent article 1 of the present embodiment, when the article 1 is discarded in a flush toilet after use, water is likely to soak into the absorbent body 4 so that the absorbent body 4 can quickly disintegrate. Yes. Moreover, since the surface sheet 2 is joined to the back surface sheet 3 via the absorber 4, the surface sheet 2 and the back surface sheet 3 are easily separated by water dissolution of the absorber 4.

  As shown in FIGS. 7 and 8, the absorbent article 1 according to the fifth preferred embodiment of the present invention has a hollow shape in which the absorbent body 4 is open on the non-skin contact surface side. A certain back sheet 3 is also raised toward the skin side of the wearer, and the non-skin contact surface side surfaces of the back sheet 3 are water-soluble bonded at the bonding part 5 at one end in the longitudinal direction. It is partially bonded by the agent. In addition, a shape-retaining sheet 7 is bridged between both longitudinal sides on the non-skin contact surface side of the back sheet 3, and the shape-retaining sheet 7 has water disintegration properties. Both side portions in the direction and both side portions in the longitudinal direction of the non-skin contact surface of the back sheet 3 are bonded with a water-soluble adhesive.

  The absorbent article 1 of the present embodiment will be described in detail. The non-skin contact surface side surfaces of the back sheet 3 are non-skin contact surfaces as shown in FIG. The outer sides in the width direction are separated from each other and open in a fan shape. On the other hand, at one end portion in the longitudinal direction, the surfaces on the non-skin contact surface side of the back sheet 3 are bonded to each other as shown in FIG. Moreover, in this article 1, as shown in FIG. 9, the width of the end portion in the longitudinal direction where the adhesive portion 5 is provided is narrower than the other end portion in the longitudinal direction.

As shown in FIG. 9, the shape-retaining sheet 7 in the absorbent article 1 of the present embodiment has a substantially isosceles trapezoidal shape in plan view, and has upper bases on both sides (the shorter side). Each close portion has a shape that is convexly curved outward in the width direction. The shape-retaining sheet 7 is bonded to the surface on the non-skin contact surface side of the back sheet 3 from the inside to the center of the end where the bonding portion 5 is provided in the longitudinal direction.
Moreover, the cross-sectional shape of the space surrounded by the shape retaining sheet 7 and the back sheet 3 has a substantially triangular shape as shown in FIG. When wearing the absorbent article 1 of this embodiment, it is preferable to insert a finger into this space, support the article 1 with the finger, and wear the article 1 as it is sandwiched in the space between the labia. . At this time, the non-skin contact surface side surfaces of the back sheet 3 are configured to regulate the insertion of fingers at the bonding portion 5.

The size of the shape-retaining sheet 7 is 12 cm in length, 6 cm in width when unfolded, and the same thickness from the viewpoint of not clogging the water distribution pipe, septic tank or sewer, etc., when the article 1 is discarded in the flush toilet after use. It is preferable that each thickness does not exceed 0.2 cm.
Moreover, as a material of the shape-retaining sheet 7 having water decomposability, various known materials are used, but those described in the above-described embodiments are preferable, and it is more preferable that the material has biodegradability.

In the present embodiment, if at least the shape-retaining sheet 7 and the bonding portion 5 are detached from the main body during washing, the main body opens into a small sheet-like form, so that the pipe is not easily clogged and can be washed with water. In this case, the top sheet 2, the absorber 4, the back sheet 3, and the fixing adhesive may be biodegradable.
More preferably, not only the shape-retaining sheet 7 and the adhesive portion 5 but also the top sheet 2, the absorbent body 4 and the back sheet 3 are decomposed into their respective members. For this purpose, the fixing adhesive is water-soluble as described above. It is necessary to be sex.
Furthermore, it is the most preferable embodiment that each sheet (or component) is hydrolyzed and separated in a water stream with the least risk of clogging the piping.
Various known materials are used as the material of the absorbent 4 having water decomposability in the absorbent article 1 of the present embodiment, and those described in the above-described embodiments are preferable. It is preferable to use it.
More specifically, the absorbent body 4 is formed of a layer made of a water-decomposable sheet, and the water-decomposable sheet is made of absorbent hydrolyzed paper. As shown in FIG. It is partially applied in a grid pattern.

The absorbent body 4 is formed with a water repellent coating portion 41 coated with a water repellent. In the longitudinal direction of the absorbent body 4, the water repellent coating part 41 extends continuously along the longitudinal direction to the front and rear end portions thereof, and is provided at predetermined intervals along the width direction. Moreover, in the width direction of the absorber 4, it extends over the both ends along the width direction, and is provided at predetermined intervals along the longitudinal direction. Further, the linear portions along the longitudinal direction and the width direction are orthogonal to each other.
The absorbent body 4 is preferably coated with a water repellent so as to form a plurality of partially closed shapes by the water repellent coating portion 41. In the present embodiment, the absorbent body 4 has a plurality of substantially rectangular closed shapes by the water repellent coating part 41 as shown in FIG.
Further, the water repellent agent in the water repellent coating portion 41 immerses the entire thickness direction of the absorbent body 4 from the viewpoint of maintaining the structure of the absorbent body 4 in a wet state when the article 1 is used. It is preferable that
Moreover, it is preferable that the basic weight of the absorber 4 is 25-200, More preferably, it is 40-150 g / m < ² > from a viewpoint of ensuring sufficient absorptivity and the rigidity at the time of wetness. This may be composed of a single sheet or a plurality of sheets.

The interval between the linear portions along the longitudinal direction and the width direction forming the water repellent coating portion 41 is maintained while the rigidity of the sheet is maintained in a wet state when the absorbent article 1 is used. When it is later discarded in a flush toilet, it is preferably 7 to 20 mm from the viewpoint of quick water dissolution. Moreover, it is preferable that the width | variety of the linear part along the longitudinal direction and the width direction which respectively forms the water repellent coating part 41 is 1-5 mm from the same viewpoint.
In addition, the presence or absence of water-repellent processing and the coating pattern of the water-repellent agent were sprayed on the entire surface of the water-degradable sheet by spraying water containing an appropriate colorant, such as a 0.03% aqueous solution of methylene blue. It can be easily confirmed by visually confirming the coloring at the time. At this time, the water-repellent processed portion is less likely to penetrate the liquid, so that the coloring is lighter, and the non-processed portion is darkly colored.

  In the absorbent article 1 of the present embodiment, various known materials are used as the water repellent for forming the water repellent coating portion 41 of the absorbent body 4, but silicone oligomers, fluorine oligomers, and the like are preferable. Specific examples of the silicone oligomer include polymethylsilicone obtained by substituting a part of its methyl group with a phenyl group or a trifluoropropyl group, and polyfluorosilicone. Specific examples of the fluorine oligomer include a polymer of an acrylate ester of an alcohol containing a perfluoroalkyl group or a phosphate ester.

According to the absorbent article 1 of the present embodiment, a finger is inserted between the back sheet 3 and the shape-retaining sheet 7 to support the article 1 and can be easily worn by being sandwiched in the space between the labia. Wear stably in the space between the labia.
Further, the article 1 has a hollow shape of the absorbent body 4 so that when the article 1 is discarded in a flush toilet, the article 1 becomes wet and flexible.
Further, in the back sheet 3, the surfaces on the non-skin contact surface side are bonded to each other with a water-soluble adhesive, and both the longitudinal side portions on the non-skin contact surface side and the shape-retaining sheet 7 are water-soluble. Therefore, when the article 1 is discarded in a flush toilet after use, each of the water-soluble adhesives melts and the non-skin contact surface side of the article 1 opens, and the article 1 Since it becomes more flexible, it rapidly shifts to separation between the top sheet 2 and the back sheet 3 by stirring with a large amount of water flow.
Further, since the water-repellent paper as the absorbent body 4 is coated with a water-repellent agent in a lattice shape, the rigidity is maintained in the wet state when the absorbent article 1 is used, but it is discarded in the flush toilet after use. In this case, since water is dissolved by stirring with a large amount of water flow, clogging of water pipes and septic tanks is not caused.
Furthermore, since the shape retaining sheet 7 has water decomposability, it is further decomposed after being separated from the back sheet 3.

The absorbent article of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention.
For example, it is also preferable to provide a fixing adhesive portion for fixing to the underwear or the like on the non-skin contact surface side of the absorbent article of the present invention. In particular, when used in combination with conventional absorbent articles fixed to underwear, the absorbent article of the present invention is the skin contact surface of the absorbent article fixed to the underwear through the adhesive portion during wearing Fixed to. Therefore, when exchanging the absorbent article of the present invention, the undergarment can be lowered and the article can be removed from between the labial areas, which is preferable because the exchange is easy.
In addition, when used in combination with conventional absorbent articles and the like in this way, a usage form that is not sandwiched between the labiums is possible by a method of fixing the invention product on the surface of the absorbent article in advance.

Further, in each embodiment, the top sheet and the back sheet are joined by a plurality of embossed parts by heat sealing as physical joining means, but may be an embossed part by ultrasonic sealing, or by a pin or a needle. May be acceptable.
Further, in each embodiment, each of the top sheet, the absorber or the back sheet has water decomposability and / or biodegradability, but each component may be separated from each other by the water flow of the flush toilet, It does not have to be water-degradable or biodegradable.
Further, in each embodiment, the non-skin contact surface of the absorbent body and the back sheet are adhered by applying a water-soluble adhesive in a full-surface coating pattern, as shown in FIG. It is also preferable that a water-soluble adhesive is applied and adhered in a spiral coating pattern.
In the first embodiment, each of the top sheet and the back sheet is formed from a water-decomposable nonwoven fabric, but each of the top sheet and the back sheet is used alone or in combination of two or more. Is also preferable.
Moreover, in 6th Embodiment, although the surface sheet and the back surface sheet were made to isolate | separate with the water flow of a flush toilet, they may not be able to be separated. For example, even if the top sheet and the back sheet cannot be separated by the water flow of the flush toilet, the water-soluble adhesive that bonds the non-skin contact surfaces of the back sheet is dissolved in water, and the shape retaining sheet and the back sheet Since the water-soluble adhesive that bonds the sheet dissolves in water, the non-skin contact surface opens and the absorbent article becomes flexible, so there is no possibility of clogging the water pipes and the like. Further, each of the top sheet and the back sheet has water decomposability or biodegradability, so that it is decomposed small.
Moreover, in 6th Embodiment, although the grid | lattice pattern of the water repellent coating part in an absorber was provided along the longitudinal direction and width direction of an absorbent article, it does not need to follow.
In the sixth embodiment, the shape retaining sheet 7 has water decomposability, but may have biodegradability.
The absorbent article of the present invention may be a menstrual absorption pad or an incontinence pad.
The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.

FIG. 1 is a perspective view showing a first embodiment of an absorbent article of the present invention. 2 is a cross-sectional view taken along line XX of FIG. FIG. 3 is a side view of the first embodiment shown in FIG. FIG. 4 is a plan view schematically showing a coating pattern of a water-soluble adhesive, in which (a) is an entire surface coating pattern and (b) is a spiral coating pattern. FIG. 5 is a cross-sectional view schematically showing a state in which the absorbent article of the first embodiment is worn along the line XX in FIG. 1. FIG. 6 is a cross-sectional view corresponding to FIG. 2 of the fourth embodiment of the absorbent article of the present invention. FIG. 7 is a perspective view showing a fifth embodiment of the absorbent article of the present invention. 8 is a cross-sectional view of a fifth embodiment of the absorbent article of the present invention, (a) is a cross-sectional view taken along line YY of FIG. 7, and (b) is a cross-sectional view taken along line ZZ of FIG. It is. FIG. 9: is the top view seen from the non-skin contact surface side of 5th Embodiment of the absorbent article of this invention. FIG. 10 is a plan view of the absorbent body 4 in the fifth embodiment of the absorbent article of the present invention. FIG. 11 is a plan view showing an application pattern of an adhesive to the back sheet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Absorbent article 10 Absorbent layer 11 Leak-proof layer 2 Top sheet 3 Back sheet 4 Absorbent body 41 Water repellent coating part 5 Adhesive part 6 Embossed part 7 Shape retention sheet

Claims (6)

An absorbent article comprising an absorbent layer and a leak-proof layer and used between the labia,
The central part in the width direction of the absorbent layer is raised toward the wearer's skin side, the total length is 12 cm or less, and the absorbent layer and the leak-proof layer are separated by the water flow of a flush toilet. Absorbent article.   The said absorption layer is formed from the surface sheet and the absorber, and this surface sheet and the said leak-proof layer are joined using the water-soluble adhesive agent and the physical joining means together. Absorbent article. An absorbent article comprising an absorbent layer and a leak-proof layer and used between the labia,
The center part in the width direction of the absorbent layer is raised toward the wearer's skin side, the total length is 12 cm or less, and the non-skin contact surface side surfaces of the leak-proof layer are water-soluble adhesives. Absorbent article that is partially bonded by. An absorbent article comprising an absorbent layer and a leak-proof layer and used between the labia,
The central part in the width direction of the absorbent layer is raised toward the skin side of the wearer, the total length is 12 cm or less, and the shape is maintained between both side parts in the longitudinal direction on the non-skin contact surface side of the leak-proof layer. A sheet is stretched over, and the shape-retaining sheet has water-decomposability and / or biodegradability, and both sides in the longitudinal direction of the shape-retaining sheet and both sides in the longitudinal direction of the leak-proof layer are water-soluble. Absorbent article that is bonded with a functional adhesive.   The absorbent article according to any one of claims 1 to 4, wherein the absorbent layer has water decomposability and / or biodegradability. The absorbent article according to claim 1, wherein the leak-proof layer has water decomposability and / or biodegradability.

Images