JP2014064630A - Absorber and absorbent article using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leakage even when a large amount of humor is discharged at once by retaining diffusivity of the humor.SOLUTION: An absorber 4 is formed by laminating an upper-layer absorber 4A located at a skin contact surface side on a lower-layer absorber 4B located at a skin non-contact surface side and including a superabsorbent polymer in pulp. An opening 10 is provided at a position on the upper-layer absorber 4A corresponding to a humor discharge part H, and the opening 10 is filled with a closure member 11 consisting of a liquid-permeable porous material. A recessed space 12 opened in the upper layer absorber 4A side is provided at a position of the lower layer absorber 4B superposed with the opening 10, and the recessed space 12 is filled with a hydrophilic liquid-diffusion member 13.

Description

  The present invention relates to an absorbent used for absorbent articles such as incontinence pads, panty liners, sanitary napkins, etc. for absorbing body fluids such as urine and menstrual blood. The present invention relates to an absorbent body capable of being quickly diffused and an absorbent article using the same.

  2. Description of the Related Art Conventionally, in absorbent articles such as incontinence pads, an absorbent article in which a highly water-absorbent resin is dispersed and mixed in a water-absorbent fiber is known. A highly water-absorbent resin has properties such that when it comes into contact with moisture such as urine, it absorbs and swells to form a gel, and once it absorbs water, it does not release even if a certain pressure is applied. Moreover, the highly water-absorbent resin has an amazing water absorption capacity that is several times its own volume.

  In particular, light incontinence pads are required to be smaller and thinner in consideration of handling convenience and wearing feeling, but even in this case, urge urinary incontinence in which a large amount of urine collected in the bladder is discharged at once A large amount of highly water-absorbent resin is densely mixed in the absorber so that urine can be firmly absorbed even by people with the above symptoms. Therefore, as a result of the absorption of a large amount of urine, the part of the absorbent body corresponding to the urination opening quickly rises to the skin side, and the pad surface closely adheres to the urination opening. As a result, there is no space for receiving urine between the pad surface and the urination opening. However, there is a problem that urine leakage is lost and urine leakage is likely to occur.

  As a technique for improving urine diffusibility, in Patent Document 1 below, the absorber comprises an upper layer absorber and a lower layer absorber, and an upper layer opening is provided along the longitudinal direction of the upper layer absorber. A lower layer groove is provided along the longitudinal direction of the absorber, and an absorber recess formed by overlapping a part of the upper layer opening and the lower layer groove, and a portion other than the upper layer opening of the upper layer absorber and the lower layer groove Disposable absorbent articles having a liquid passing part formed by overlapping parts are disclosed.

  Further, in Patent Document 2 below, as a third embodiment, the absorber is composed of an upper layer absorber and a lower layer absorber, and a liquid diffusive sheet is disposed between the upper layer absorber and the lower layer absorber. In the upper absorbent body, an opening along the longitudinal direction is formed from the front edge, and a disposable absorbent article is disclosed in which a liquid-permeable surface sheet and a liquid-diffusible sheet are joined. That is, since the upper layer absorber is not disposed in the opening of the upper layer absorber, the liquid is transmitted to the liquid diffusive sheet as soon as the liquid enters from the liquid-permeable surface sheet located in the opening. The liquid is diffused by the liquid diffusive sheet.

JP 2011-125537 A JP 2006-167196 A

  However, in the absorbent articles described in Patent Documents 1 and 2, since the opening of the upper-layer absorbent body is a space or the top sheet is only disposed, the absorbent body absorbs urine and swells, There was a possibility that the absorber around the part swelled and the opening disappeared. As a result, there was no space for catching urine, and diffusibility of urine was lost and urine leakage was likely to occur. Further, in the absorbent article described in Patent Document 2, since the opening is formed over the front end edge of the absorbent body, there is a possibility that leakage from the front end edge may occur.

  Therefore, a main problem of the present invention is to provide an absorbent body that maintains the diffusibility of body fluid and prevents leakage even when a large amount of body fluid is discharged at once, and an absorbent article using the same.

In order to solve the above-mentioned problem, as the present invention according to claim 1, the upper absorbent body located on the skin contact surface side and the non-skin contact surface side and the superabsorbent resin contained in the pulp An absorber in which a lower layer absorber is laminated,
An opening is provided at a position corresponding to the body fluid discharge part of the upper-layer absorber, and the opening is filled with a closing member made of a liquid-permeable porous material,
Provided is an absorbent body characterized in that a recessed space that opens to the upper absorbent body is provided at a position overlapping the opening of the lower absorbent body, and the recessed space is filled with a hydrophilic liquid diffusion member. Is done.

  In the first aspect of the present invention, an opening is provided at a position corresponding to the body fluid discharge portion of the upper-layer absorbent body, and the opening is filled with a closing member made of a liquid-permeable porous material. Even when body fluid is discharged, liquid diffusibility can be maintained by the closing member disposed at a position corresponding to the body fluid discharge portion, and even if the absorbent around the opening absorbs water and the highly water-absorbent resin swells Since the closing member is filled, the opening is maintained, and a space for temporarily receiving body fluid can be secured.

  Furthermore, since a recessed space opened to the upper absorbent body side is provided at a position overlapping with the opening of the lower layer absorbent body, and this recessed space is filled with a hydrophilic liquid diffusion member, body fluid that has entered through the opening is It is efficiently transferred to the recessed space of the lower layer absorber through the liquid diffusion member, and the body fluid can be diffused and absorbed and held over a wide range of the lower layer absorber. In addition, since the opening and the recessed space are provided at a position where they overlap, that is, the closing member filled in the opening and the liquid diffusion member filled in the recessed space are arranged in contact with each other. The body fluid is efficiently transferred from the member to the member for liquid diffusion, and it is difficult for the body fluid to remain on the upper absorbent body side.

  Therefore, even when a large amount of body fluid is discharged at once, the liquid diffusibility can be maintained, and the leakage of body fluid can be prevented.

  According to a second aspect of the present invention, there is provided the absorbent body according to the first aspect, wherein the closing member is a foamed plastic having an open cell structure.

  In the invention according to the second aspect, a desirable material for the closing member filled in the opening of the upper absorbent body is defined, and the foamed plastic such as polyurethane foam having an open cell structure is used. Since such foamed plastic has an appropriate cushioning property, even if the absorbent body around the opening absorbs water and the highly water-absorbent resin swells, the foam can be prevented from bulging to the opening side and the opening can be maintained. become.

  According to a third aspect of the present invention, there is provided the absorber according to any one of the first and second aspects, wherein the liquid diffusion member is a hydrophilic nonwoven fabric.

  In the invention according to the third aspect, it is possible to use a hydrophilic non-woven fabric excellent in liquid diffusibility by defining a desirable material for the liquid diffusing member filled in the recessed space of the lower layer absorber.

  As a fourth aspect of the present invention, the opening is formed such that the width dimension is gradually enlarged from the rear side to the front side in a range including at least a portion corresponding to the body fluid discharge portion in the front-rear direction of the absorber. The absorber in any one of Claims 1-3 currently provided is provided.

  In the invention described in claim 4, the planar shape of the opening formed in the upper-layer absorber is defined. That is, in the range including at least the part corresponding to the body fluid discharge part in the front-rear direction of the absorber, the opening is formed in a planar shape in which the width dimension gradually expands from the rear side to the front side, thereby discharging to the opening. This makes it easy for the body fluid to diffuse toward the front side, preventing the body fluid from diffusing to the rear side and causing back leakage.

  As the present invention according to claim 5, there is provided the absorber according to any one of claims 1 to 4, wherein the opening is formed in a range narrower in plan than the recessed space.

  In the invention according to claim 5, the planar size relationship between the opening and the recessed space is defined, and the opening is filled in the recessed space from the opening by forming the opening in a narrower range than the recessed space. Since the body fluid can be quickly transferred to the liquid diffusing member, the body fluid hardly remains in the opening.

  As the present invention according to claim 6, the amount of the superabsorbent resin contained in the lower layer absorber is relatively larger than the amount of the superabsorbent resin contained in the upper layer absorber. The absorber in any one of 1-5 is provided.

  In the invention according to claim 6, the amount of the superabsorbent resin contained in the lower layer absorber is set to be relatively lower than the amount of the superabsorbent resin contained in the upper layer absorber. Since the body fluid is easily absorbed and held by the superabsorbent resin of the absorbent body, the body fluid is less likely to remain in the liquid diffusion member in the recessed space.

As the present invention according to claim 7, in an absorbent article in which an absorber is interposed between a liquid-permeable top sheet and a back sheet,
An absorbent article using the absorbent according to any one of claims 1 to 6 as the absorbent is provided.

  As described above, according to the present invention, even when a large amount of body fluid is discharged at once, the diffusibility of body fluid can be maintained and leakage can be prevented.

It is a partially broken development view of the light incontinence pad 1 according to the present invention. It is the II-II arrow directional view (cross-sectional view). It is the III-III arrow directional view (longitudinal sectional view) of FIG. FIG. 4 is an exploded perspective view of the absorber 4. FIG. 4A is a plan view of the upper layer absorbent body 4A, and FIG. 5B is a plan view of the lower layer absorbent body 4B, showing the diffusion state of body fluid. 3 is an enlarged plan view of an opening 10. FIG. It is an enlarged plan view of the opening 10 according to another embodiment. 3 is an enlarged plan view of a recessed space 12. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic configuration of light incontinence pad 1]
As shown in FIGS. 1 and 2, the light incontinence pad 1 according to the present invention is provided between a liquid-impermeable back sheet 2 and a liquid-permeable surface sheet 3 (hereinafter also simply referred to as a surface sheet). As shown in the figure, the absorbent body 4 or the absorbent body 4 surrounded by the crepe paper 5 is interposed, and the three-dimensional gathers G and G are provided on both sides of the surface side.

  The liquid-impervious back sheet 2 is made of a sheet material having at least water-impervious properties such as polyethylene and polypropylene, but in addition to this, a non-woven sheet after securing a substantially liquid-impervious property through a waterproof film. (In this case, a liquid-impervious back sheet is composed of the waterproof film and the nonwoven fabric). In recent years, those having moisture permeability tend to be suitably used from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used.

  Next, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used as the top sheet 3. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Of these processing methods, the spunlace method is excellent in terms of flexibility and the spunbond method is excellent in drapeability, and the thermal bond method and the air-through method are excellent in terms of being bulky and soft.

  The absorbent body 4 interposed between the liquid-impermeable back sheet 2 and the top sheet 3 includes an upper layer absorbent body 4A located on the skin contact surface side and a lower layer absorbent body located on the non-skin contact surface side. 4B is laminated, and if necessary, these layers are joined together by an adhesive such as a hot-melt adhesive, or are bonded by embossing and integrated. The upper layer absorbent body 4A may be composed only of pulp. For example, a super absorbent polymer dispersed in a pulp, or a chemical fiber mixed in a pulp and a super absorbent polymer dispersed. It is desirable to use something. On the other hand, as the lower layer absorbent body 4B, a material in which a highly water-absorbing resin is dispersedly arranged in pulp or a material in which chemical fibers are mixed in a pulp and a highly water-absorbing resin is dispersedly used is used. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as molten pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price. The absorber 4 will be described in more detail later.

  Moreover, you may mix a synthetic fiber with each of the said upper layer absorber 4A and the lower layer absorber 4B. As the synthetic fiber, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. It may be a mixture. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be used. In the case of a hydrophobic fiber, it is desirable to use a synthetic fiber that has been surface-treated with a hydrophilizing agent so as to have an affinity for body fluids.

  Examples of the superabsorbent resin include cross-linked polyacrylate, self-crosslinked polyacrylate, saponified acrylate-vinyl acetate copolymer cross-linked, isobutylene / maleic anhydride copolymer cross-linked, Examples include cross-linked polysulfonates, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process of the highly water-absorbent resin having the water absorption performance, the water absorption force and the water absorption speed can be adjusted by adjusting the crosslinking density and the crosslinking density gradient.

  As shown in the figure, the absorbent body 4 is formed by laminating the upper layer absorbent body 4A and the lower layer absorbent body 4B in order to maintain the shape and quickly diffuse urine etc. In this state, it is desirable to surround with the crepe paper 5.

  Side nonwoven fabrics 15 and 15 are provided on both sides of the surface side of the light incontinence pad 1 along the longitudinal direction and over the entire length of the light incontinence pad 1, and outer portions of the side nonwoven fabrics 15 and 15. The liquid-impermeable back sheet 2 is laterally extended, and the side nonwoven fabric 15 portion and the liquid-impervious back sheet 2 portion that are extended laterally are hot. Side flaps are formed by bonding with a melt adhesive or the like.

  As the side nonwoven fabric 15, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of important functions. For example, if importance is placed on functions such as preventing the infiltration of urine and cages, or enhancing the feeling of touch, a water-repellent non-woven fabric coated with a silicon-based, paraffin-based, or alkylchromic chloride-based water repellent. If the emphasis is on the absorbability of body fluids, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol, in the process of producing a synthetic fiber, or stannic chloride Hydrophilic treated non-woven fabric that has been treated with a metal salt, made partially porous by dissolving the surface, making the synthetic fiber swelled or made porous by applying metal hydroxide, etc., and applying hydrophilicity by applying capillary action It is desirable to use As such a side nonwoven fabric 15, natural fibers, synthetic fibers, regenerated fibers, or the like, which are formed by an appropriate processing method can be used. Preferably, the fabric weight is reduced by suppressing the basis weight. Nonwoven fabric should be used.

  As shown in FIG. 2, the inner side of the side nonwoven fabric 15 folds the side nonwoven fabric 15 almost twice, and inside the double sheet, in the middle in the height direction, at both ends or in the longitudinal direction as appropriate. One or a plurality of, in the illustrated example, two thread-like elastic elastic members 16, 16 are disposed, and the double sheet portion is raised on the surface side by the contraction force. Is formed.

[Absorber 4]
As described above, the absorber 4 is composed of an upper layer absorber 4A and a lower layer absorber 4B as shown in FIGS. Basis weight of the upper layer absorbent body 4A and a lower layer absorber 4B the total absorber whole ^{pulp, 90g / m 2 ~1000g / m} 2, and it is preferably a ^{100g / m 2 ~900g / m 2} . Also, the basis weight of the entire absorbent body of the high water-absorbent ^{resin, 10g / m 2 ~500g / m} 2, and it is preferably a ^{15g / m 2 ~400g / m 2} . When the superabsorbent resin content is less than 10 g / m ² , sufficient absorbability cannot be provided, and when it exceeds 500 g / m ² , the entanglement between the pulp fibers disappears, and the sheet strength decreases. Breaking or cracking is likely to occur.

Here, it is preferable that the basis weight of the superabsorbent resin dispersedly disposed in the upper layer absorbent body 4A is set to be relatively smaller than the basis weight of the superabsorbent resin dispersedly disposed in the lower layer absorbent body 4B. That is, the basis weight of the superabsorbent resin of the upper absorber 4A ≦ the basis weight of the superabsorbent resin of the lower absorber 4B. This makes it easier for urine and the like to be absorbed and held by the lower layer absorbent body 4B rather than the upper layer absorbent body 4A, and prevents gel blocking when the superabsorbent resin in the upper layer absorbent body 4A absorbs water and swells. Specifically, preferably 0g / m ² ~250g / m ² as a weight per unit area of the superabsorbent resin of the upper layer absorbent body ^{4A, 40g / m 2 ~250g /} m 2 is more preferable. Preferably 10g / m ² ~450g / m ² as a weight per unit area of the superabsorbent resin of the lower layer absorber 4B, and more preferably ^{150g / m 2 ~450g / m 2} .

  The thickness of the upper layer absorber 4A is preferably set to be equal to or less than the thickness of the lower layer absorber 4B. That is, the thickness of the upper layer absorber 4A ≦ the thickness of the lower layer absorber 4B. Thereby, the body fluid easily moves from the upper layer absorber 4A to the lower layer absorber 4B, and the body fluid can be quickly absorbed and held in the lower layer absorber 4B. Specifically, the thickness of the upper absorbent body 4A is preferably 3 mm to 11 mm, and the thickness of the lower absorbent body 4B is preferably 8 mm to 15 mm.

  The upper layer absorbent body 4A and the lower layer absorbent body 4B are formed in substantially the same planar shape, and the outer edges of both are substantially coincided with each other in a laminated state, and the upper layer absorbent body 4A and the lower layer absorbent body 4B may be formed in a substantially rectangular shape that is vertically long in the wearer's front-back direction. preferable.

  In the light incontinence pad 1, the upper layer absorbent body 4A is provided with an opening 10 penetrating the upper layer absorbent body 4A at a position corresponding to the body fluid discharge part H, and a liquid-permeable porous material is formed in the opening 10. The closing member 11 made of is filled.

  The opening 10 is a range including the body fluid discharge portion H, is formed in a wide range on the front side thereof, and is a missing portion of the absorber that does not include the upper-layer absorber 4A. The opening 10 may be formed such that the width dimension is gradually enlarged from the rear side to the front side in a range including at least a portion corresponding to the body fluid discharge portion H in the front-rear direction of the absorber 4 in plan view. preferable. In the example shown in FIG. 4, the shape is a triangular shape in plan view, which is linearly enlarged from the central part in the width direction on the rear side of the body fluid discharge part H to both sides and connected in a straight line in the width direction at the front side position. Is formed.

  The closing member 11 filled in the opening 10 is a material that has good liquid permeability and does not have liquid retaining property, and has cushioning and restoring properties, and has an open cell structure in which bubbles are connected to the inside. It is desirable to use foamed plastic. As the material, known materials such as polyurethane, polystyrene, polyolefin such as polyethylene and polypropylene can be widely used, but it is desirable to use polyurethane from the viewpoint of cushioning properties and liquid permeability. As the pore diameter, the average pore diameter is preferably 1 mm or more, and the porosity is preferably about 70 to 99.5%.

  The closing member 11 may have a planar size substantially equal to the size of the opening 21, but is preferably formed slightly larger than the size of the opening 21, and the closing member 11 is closed when the opening 10 is filled. It is preferable that the side surface of the member 11 is provided so as to press the peripheral surface of the opening 21. Thereby, even if the highly water-absorbent resin swells when the absorbent body absorbs water, it is difficult to swell toward the opening 10, and the occlusion member 11 can be prevented from falling off from the opening 10. Moreover, the blocking member 11 is preferably formed with a thickness of 5 mm or more, with the thickness being less than or equal to the thickness of the upper layer absorbent body 4A. The closing member 11 is disposed so that the upper surface (skin contact surface) side does not protrude above the upper surface (skin contact surface) of the upper layer absorbent body 4A, and the lower surface (non-skin contact surface) side is the upper layer absorption. It is preferable that the body 4A is provided so as to protrude from the lower surface (non-skin contact surface) of the body 4A or slightly below, and to be in contact with the liquid diffusion member 13 (described in detail later) on the lower layer side. In addition, since the said closure member 11 gives the repulsive force with respect to the surrounding surface of the opening 10, the thing of 1 layer structure (integral structure) is preferable rather than setting it as a multilayer structure.

  On the other hand, the lower layer absorber 4B is provided with a recessed space 12 that opens to the upper layer absorber 4A side (skin contact surface side) at a position overlapping the opening 10 of the upper layer absorber 4A in the thickness direction, The recessed space 12 is filled with a hydrophilic liquid diffusion member 13.

  As shown in FIG. 4, the recessed space 12 is a portion where a predetermined region is recessed at a predetermined depth from the skin contact surface side of the lower layer absorbent body 4 </ b> B, and is a position that overlaps the opening 10 in a plane. And in a range wider than the opening 10 in a plan view. In the illustrated example, the lower layer absorbent body 4B is formed in a rectangular shape that is long in the front-rear direction at the center in the width direction, but may be formed in various planar shapes such as an ellipse, an oval, or a rhombus. In order to form such a recessed space 12, it can be provided by stacking on a formwork provided with a convex portion in this space portion, pressing from the upper surface side, or the like.

  The depth of the recessed space 12 is formed to be smaller than the thickness of the lower layer absorber 4B, and is preferably 1 mm or more, and more preferably 5 mm or more. The depth of the recessed space 12 is provided at a substantially constant depth throughout.

  The liquid diffusing member 13 filled in the concave space 12 may be any non-woven fabric that has good water absorption and excellent liquid diffusibility, and is hydrophilic to body fluids. Specifically, by using recycled fibers such as rayon and cupra, natural fibers such as cotton, the material itself has hydrophilicity, or synthesis of olefins such as polyethylene or polypropylene, polyesters, polyamides, etc. The fiber which surface-treated with the hydrophilizing agent and provided the hydrophilic property can be used. This nonwoven fabric is desirably a nonwoven fabric produced by an air-through method or a thermal bond method in order to give bulkiness, and is composed of an air-through nonwoven fabric, a nonwoven fabric using crimped fibers, an elastomer represented by styrene or urethane. It is preferable to use a stretchable nonwoven fabric or the like.

The basis weight of the nonwoven fabric, 20 g / m ² or more, and it is preferably a 40 to 100 g / m ² approximately. The fineness of the nonwoven fabric is preferably 1 dt or more and 10 dt or less, and preferably about 5 dt.

The liquid diffusion member 13 may be composed of one layer, or may be composed of a multilayer structure of two or more layers. In the case of a multi-layer structure, materials with the same properties may be laminated, for example, materials with different properties such as those set so that hydrophilicity or diffusivity becomes higher toward the lower layer side. May be. It is also possible to fold and arrange a long nonwoven fabric. In this case, the nonwoven fabric basis weight in the folded state is desirably 40 g / m ² or more.

  When the body fluid is discharged to the absorbent body 4 as described above, as shown in FIG. 5A, in the upper layer absorbent body 4A, the width of the opening 10 is within the range including the portion corresponding to the body fluid discharge portion H. Since the front side is formed so as to gradually expand from the side, the body fluid easily diffuses toward the front side inside the closing member 11. This prevents back leakage. In addition, since the opening 10 of the upper layer absorbent body 4A is filled with the closing member 11, even when a large amount of body fluid is discharged from the body fluid discharge portion at once, the closing member disposed at a position corresponding to the body fluid discharge portion 11 can maintain liquid diffusibility, and even if the absorbent body around the opening 10 absorbs water and the highly water-absorbent resin swells, the closing member 11 is less likely to bulge out toward the opening 10 and the opening state of the opening 10 Can be maintained, and a space for temporarily receiving bodily fluids can be secured.

  Further, as shown in FIG. 5B, in the lower layer absorbent body 4B, the body fluid that has permeated from the blocking member 11 diffuses in the front-rear direction and the width direction by the liquid diffusion member 13, and is absorbed by the lower layer absorbent body 4B. Retained. In addition, since the liquid diffusion member 13 is filled in the concave space 12 of the lower layer absorber 4B, the body fluid that has entered through the opening 10 is efficiently transferred to the concave space 12 of the lower layer absorber 4B through the liquid diffusion member 13. Then, the body fluid can be diffused and absorbed and held over a wide range of the lower layer absorbent body 4B. Further, since the recessed space 12 is provided at a position overlapping the opening 10, that is, the closing member 11 filled in the opening 10 and the liquid diffusion member 13 filled in the recessed space 12 are in contact with each other. Therefore, the body fluid is efficiently transferred from the closing member 11 to the liquid diffusing member 13, and the body fluid hardly remains on the upper layer absorbent body 4A side.

  Subsequently, the opening 10 will be described in more detail. As shown in FIG. 6, the position with respect to the upper-layer absorber 4A is an intermediate position of the upper-layer absorber 4A, that is, a position where the opening is not connected to the absorber end. Is provided. Specifically, it is provided at the center portion in the width direction and at a position including the body fluid discharge portion H in the longitudinal direction. The rear end of the opening 10 is located in a range where the distance 10a from the center of the body fluid discharge part H is within 1 cm. The total length 10b of the opening 10 (length in the front-rear direction of the light incontinence pad 1) is preferably 3 cm or more and 10 cm or less, and more preferably 3 cm or more and 5 cm or less. The maximum width 10c of the opening 10 (the maximum length in the width direction of the light incontinence pad 1) 10c is preferably 1 cm or more, and more preferably 3 cm or more and 5 cm or less.

  As described above, the planar shape of the opening 10 is formed such that the width dimension gradually increases from the rear side to the front side in a range including at least a portion corresponding to the body fluid discharge portion H in the front-rear direction of the light incontinence pad 1. If so, in addition to the triangle as in the above embodiment, as shown in FIG. 7, it can be formed in various shapes such as (A) trapezoid, (B) polygon, (C) substantially U-shaped. it can. Note that, in a range other than the range including the part corresponding to the body fluid discharge part H, the width dimension may be either a shape gradually expanding from the rear side to the front side or a shape parallel to the width direction. It is not desirable to form in a shape that inhibits diffusion, specifically in a shape in which the width dimension is gradually reduced on the front side than on the rear side.

  Next, the recess space 12 will be described in more detail. As shown in FIG. 8, the position relative to the lower layer absorber 4B is a position that overlaps the opening 10 in a plan view, and is intermediate between the lower layer absorber 4B. The position, that is, the concave portion is provided at a position where it does not connect to the absorber end. Specifically, it is provided at the center portion in the width direction and at a position including the body fluid discharge portion H in the longitudinal direction. The front end of the recessed space 12 is located at a distance 12a from the center of the body fluid discharge part H of 5 cm to 15 cm, preferably about 9 cm. The rear end of the recessed space 12 is preferably located within a range where the distance 12b from the rear end of the opening 10 is 5 cm or more. Both side ends of the recessed space 12 are located at the same position as or outside the side edge (maximum width position) of the opening 10, and the distance 12 c from the side edge of the opening 10 is located within a range of 5 mm or more. Is preferred.

  In order to manufacture the above-described absorbent body 4, firstly, a stacked body having a substantially constant thickness is formed by stacking pulp with a highly water-absorbing resin mixed therein, and then pressed such as an embossing roll having a convex portion. The lower layer absorbent body 4B in which the recessed space 12 is formed by molding is formed, or the recessed space 12 is formed by stacking pulp in which a superabsorbent resin is mixed in a mold having a convex portion in the shape of the recessed space 12 in advance. The lower layer absorbent body 4 </ b> B formed with the above is molded, and the liquid diffusion member 13 is disposed in the recessed space 12. In another step, the upper absorbent body 4A is formed by stacking the pulp mixed with the superabsorbent resin except for the opening 10 portion, and on the upper surface of the lower absorbent body 4B, if necessary. Lamination is performed through a joining means such as a hot melt adhesive. Then, the said obstruction | occlusion member 11 is filled into the opening 10 of 4 A of upper layer absorbers, and the manufacturing process of the absorber 4 is completed. Thereafter, if necessary, the absorbent body 4 composed of the upper layer absorbent body 4A and the lower layer absorbent body 4B is surrounded by the crepe paper 5 and sent to the next manufacturing process of the light incontinence pad 1.

  DESCRIPTION OF SYMBOLS 1 ... Light incontinence pad, 2 ... Liquid impervious back surface sheet, 3 ... Liquid permeable surface sheet, 4 ... Absorber, 4A ... Upper layer absorber, 4B ... Lower layer absorber, 5 ... Crepe paper, 10 ... Opening, 11 ... Blocking member, 12 ... recessed space, 13 ... liquid diffusion member

Claims (7)

An absorber in which an upper layer absorber positioned on the skin contact surface side and a lower layer absorber containing the superabsorbent resin in the pulp are positioned on the non-skin contact surface side,
An opening is provided at a position corresponding to the body fluid discharge part of the upper-layer absorber, and the opening is filled with a closing member made of a liquid-permeable porous material,
An absorbent body, wherein a recessed space that opens to the upper absorbent body side is provided at a position overlapping the opening of the lower absorbent body, and the recessed space is filled with a hydrophilic liquid diffusion member.   The absorber according to claim 1, wherein the closing member is a foamed plastic having an open cell structure.   The absorbent according to claim 1, wherein the liquid diffusion member is a hydrophilic nonwoven fabric.   The opening is formed such that the width dimension is gradually enlarged from the rear side to the front side in a range including at least a portion corresponding to the body fluid discharge portion in the front-rear direction of the absorber. The absorber according to crab.   The absorber according to any one of claims 1 to 4, wherein the opening is formed in a range narrower in plan than the recessed space.   The absorption according to any one of claims 1 to 5, wherein the amount of the superabsorbent resin contained in the lower layer absorber is relatively larger than the amount of the superabsorbent resin contained in the upper layer absorber. body. In the absorbent article in which an absorbent body is interposed between the liquid-permeable top sheet and the back sheet,
An absorbent article using the absorbent according to any one of claims 1 to 6 as the absorbent.

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