Absorbent pad

Abstract

To provide an absorbent pad capable of suppressing the occurrence of urine leakage even when urine is discharged after liquid stool is discharged.SOLUTION: An absorbent pad 1 comprises: a surface layer 2 which has protrusions 21 protruding toward a skin side and recesses 22 having apertures 23 in a bottom 22T; a stool capture layer 4 which is made of single layer or multi-layer nonwoven fabric in which an inter-fiber distance on a skin-facing surface side contacting with the surface layer 2 is longer than an inter-fiber distance on a non-skin-facing surface side, and captures viscid or solid components of liquid stool supplied through the apertures 23; a mediation layer 5 which is made of a hydrophilic member and supplied with a low-viscosity component included in the liquid stool; a diffusion layer 6 which diffuses the low-viscosity component supplied via the mediation layer 5, in a direction crossing a thickness direction of the absorbent pad 1; and a urine absorption layer 7 which holds the low-viscosity component diffused by the diffusion layer 6, and supplied urine. They are provided in this order from the skin-facing surface side toward the non-skin-facing surface side of the absorbent pad 1.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an absorbent pad. [Background technology]

[0002] Regarding components of absorbent articles such as diapers, studies have been conducted taking into consideration the processing and retention of liquid feces. For example, Patent Document 1 proposes an absorbent article comprising a top sheet that is permeable to liquid feces and faces the skin, an absorbent body that retains liquid feces, a second sheet that is interposed between the top sheet and the absorbent body and is permeable to liquid feces and covers the outer surface of the absorbent body, a sheet that is impermeable to liquid feces, etc., on the non-skin-contacting side of the absorbent body and covers the outer surface of the absorbent body, and a back sheet that covers the outside of the impermeable sheet to liquid feces, etc., and forms the non-skin-contacting surface of the absorbent article. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-045393 Summary of the Invention [Problem to be solved by the invention]

[0004] Absorbent articles such as diapers and absorbent pads generally include an absorbent core as the primary absorbent for bodily waste. Absorbent cores generally contain absorbent materials such as fluff pulp and absorbent polymers, but these cores have poor absorption capacity for liquid feces and may not be able to quickly absorb liquid feces. Furthermore, highly viscous or solid components contained in liquid feces may remain in the core wrap sheet or the like without being absorbed by the absorbent core, causing clogging between the fibers of the sheet and reducing the absorbent article's liquid absorption capacity. Absorbent articles equipped with such cores may leak urine after urination due to insufficient absorption of the urine. The absorbent article described in Patent Document 1 did not address urine leakage when urination occurs after urination of liquid feces, leaving room for improvement.

[0005] Therefore, an object of the present invention is to provide an absorbent pad that can prevent urine leakage even when urination occurs after liquid stool has been excreted. [Means for solving the problem]

[0006] The present invention relates to an absorbent pad having a surface layer with a convex portion protruding toward the skin side and a concave portion having an opening at the bottom. In one embodiment, it is preferable that the nonwoven fabric is made of a single-layer or multi-layer nonwoven fabric in which the inter-fiber distance on the skin-facing side that comes into contact with the surface layer is greater than the inter-fiber distance on the non-skin-facing side, and that it is provided with a feces capture layer that captures high-viscosity or solid components of liquid feces supplied through the openings. In one embodiment, it is preferable to provide an intermediate layer made of a hydrophilic material that receives the low-viscosity components contained in the liquid feces. In one embodiment, it is preferable to provide a diffusion layer that diffuses the low-viscosity component supplied via the intermediate layer in a direction intersecting the thickness direction of the absorbent pad. In one embodiment, it is preferable to provide a urine absorption layer that contains a highly absorbent polymer and that retains the low-viscosity component diffused by the diffusion layer and the supplied urine. In one embodiment, it is preferable that the absorbent pad has the surface layer, the feces capture layer, the intermediate layer, the diffusion layer and the urine absorption layer in this order from the skin-facing side to the non-skin-facing side.

[0007] The present invention also relates to an absorbent article comprising the absorbent pad according to any one of claims 1 to 10 and a diaper in which the absorbent pad is used by being placed on the skin-facing side. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide an absorbent pad that can prevent urine leakage even when urination occurs after liquid stool has been excreted. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic plan view of the skin-facing surface of one embodiment of the absorbent pad of the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional view taken along line II in FIG. [Figure 3] 3 is a schematic enlarged perspective view of a main part of the concave-convex sheet of the surface layer of the absorbent pad shown in FIG. [Figure 4] FIG. 4 is a schematic enlarged cross-sectional view of a main part of the concavo-convex sheet of the surface layer shown in FIG. [Figure 5] FIG. 5 is an enlarged perspective view of a main part of the embossed sheet of the surface layer of another embodiment of the absorbent pad of the present invention. [Figure 6] FIG. 6 is a schematic plan view of the skin-facing surface side of another embodiment of the absorbent pad of the present invention. [Figure 7] FIG. 7 is an explanatory diagram of the absorption mechanism of the absorbent pad of the present invention. [Figure 8] FIG. 8 is an explanatory diagram of the absorption mechanism of the absorbent pad of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will now be described based on preferred embodiments with reference to the drawings. Fig. 1 shows an absorbent pad 1 according to one embodiment of the present invention. The absorbent pad 1 of this embodiment has a width direction Y and a longitudinal direction X perpendicular to the width direction Y. It is preferable that the absorbent pad 1 be used by overlaying it on the skin-facing surface (inner surface) of an absorbent article such as a diaper, with the longitudinal direction X aligned with the direction extending from the wearer's abdomen through the crotch area to the back. That is, the absorbent pad is preferably used in conjunction with an absorbent article such as a diaper as an inner layer, and is suitable for absorbing and retaining liquid feces.

[0011] In this specification, the "skin-facing side" of the absorbent pad refers to the side of the absorbent pad or its constituent member that faces the wearer's skin when the absorbent pad is worn, i.e., the side relatively closer to the wearer's skin. The "non-skin-facing side" of the absorbent pad refers to the side of the absorbent pad or its constituent member that faces the opposite side from the skin side (clothing side) when the absorbent pad is worn, i.e., the side relatively farther from the wearer's skin. Note that "when worn" here refers to the normal, proper wearing position, i.e., a state in which the absorbent pad is maintained in the correct wearing position.

[0012] As shown in Fig. 2, the absorbent pad 1 comprises a retaining layer 3 and a surface layer 2 covering one surface of the retaining layer 3. In this embodiment, the surface layer 2 covers one surface of the retaining layer 3 and forms the skin-facing surface. The surface layer 2 has convex portions 21 protruding toward the skin-facing surface side and concave portions 22 having openings 23 at their bottoms 22T. In detail, as shown in Figs. 3 and 4, the surface layer 2 is composed of an uneven sheet 2A having an uneven structure including a plurality of convex portions 21 protruding toward the skin-facing surface side and having internal spaces S1, and a plurality of concave portions 22 protruding toward the non-skin-facing surface side and having internal spaces S2 and openings at their bottoms.

[0013] When the surface layer 2 is viewed in a plane, the convex portions 21 and concave portions 22 are preferably arranged alternately and continuously along two different directions that intersect with each other. Here, the two different directions are preferably an arbitrary first direction in the plane and a second direction intersecting therewith, which intersect at an angle of 30 degrees or more and 90 degrees or less. For example, in the absorbent pad 1, they intersect at 90 degrees. That is, for example, in the absorbent pad 1, one of the two directions is the width direction Y1, and the other of the two directions is the longitudinal direction X1. Therefore, when the concave-convex sheet 2A is viewed in a plane, the convex portions 21 and concave portions 22 are arranged alternately and continuously along the longitudinal direction X1 and the width direction Y1. Note that in the embodiment shown in FIG. 3, the convex portions viewed from the skin-facing side are convex portions 21, and the concave portions are concave portions 22. Conversely, the convex portions viewed from the non-skin-facing side are concave portions 22, and the concave portions are convex portions 21.

[0014] As shown in FIGS. 3 and 4, in the textured sheet 2A of the surface layer 2 of the absorbent pad 1, the protrusions 21 have wall portions 21W between their tops 21T and the openings 21H of the internal space S1. Furthermore, the recesses 22 have wall portions 22W between their bottoms 22T and the openings 22H of the internal space S2. The bottoms 22T of the multiple recesses 22 have a lower fiber density than the surrounding areas and have openings 23. In this embodiment, all of the multiple recesses 22 have openings 23, but only some of the multiple recesses 22 may have openings 23. When some of the multiple recesses 22 have openings 23, the textured sheet 2A of the surface layer 2 has recesses 22 that include both bottoms 22T with through-holes 23 and bottoms 22T with a lower fiber density without openings 23.

[0015] The convex portions 21 and concave portions 22 of the concave-convex sheet 2A of the surface layer 2 of the absorbent pad 1 have a hemispherical protruding shape for the convex portions 21, while the concave portions 22 have a conical or truncated conical shape with a rounded bottom. Note that the protruding shapes of the convex portions 21 and the concave portions 22 are not limited to the above shapes and may be any protruding shape. For example, they may be cone-shaped, such as a cone, a truncated cone, a pyramid, a truncated pyramid, or an oblique cone.

[0016] The concave-convex sheet 2A having the convex portions 21 and the concave portions 22 preferably has no bent portions and is composed entirely of a continuous curved surface. Here, "continuous" means that there are no discontinuous portions or small holes other than the openings 23 formed in the bottoms 22T of the concave portions 22. However, fine holes such as gaps between fibers are not included in the small holes.

[0017] As the textured sheet 2A of the surface layer 2, any liquid-permeable sheet conventionally used in the art can be used without any particular limitation. Examples of the textured sheet 2A of the surface layer 2 include paper such as tissue paper, fiber sheets such as hydrophilic nonwoven fabrics (spunbond nonwoven fabrics, spunlace nonwoven fabrics containing hydrophilic fibers such as acrylic or rayon), and perforated films. As described above, the textured sheet 2A of the surface layer 2 is preferably both liquid-permeable and hydrophilic.

[0018] In the absorbent pad 1, the retention layer 3 is the part that captures and retains excrement. As shown in Figure 2, the retention layer 3 has a laminated structure in which, from the skin-facing side to the non-skin-facing side, a feces capture layer 4, an intermediary layer 5, a diffusion layer 6, and a urine absorption layer 7 are laminated in this order. The names "feces capture layer," "intermediary layer," "diffusion layer," and "urine absorption layer" are intended to indicate their functional characteristics. The absorbent pad 1 preferably has a leak-proof layer 8 on the non-skin-facing side. The leak-proof layer 8 can be formed from a liquid-impermeable sheet. Liquid-impermeable includes poorly liquid-permeable sheets, and examples of poorly liquid-permeable sheets include moisture-permeable films, etc.

[0019] The feces capture layer 4 is in contact with the surface layer 2. The feces capture layer 4 is a portion that plays a role in capturing high-viscosity or solid components of liquid feces supplied through the openings 23, and is composed of nonwoven fabric 4A. The nonwoven fabric 4A of the feces capture layer 4 has a larger inter-fiber distance on the skin-facing side than on the non-skin-facing side. The nonwoven fabric 4A of the feces capture layer 4 of this embodiment has a two-layer structure in the thickness direction Z, consisting of a skin-facing side feces capture layer 4a located on one side and a non-skin-facing side feces capture layer 4b located on the other side, and the fiber-to-fiber distance on the skin-facing side feces capture layer 4a side is greater than the fiber-to-fiber distance on the non-skin-facing side feces capture layer 4b side. In the absorbent pad 1 of this embodiment, the nonwoven fabric 4A has a two-layer structure, but it may have a single layer structure or a three-layer or more layer structure.

[0020] The nonwoven fabric 4A of the feces capture layer 4 is preferably a nonwoven fabric in which the constituent fibers are partially fused or bonded to each other, thereby creating voids, from the viewpoint of being able to provide the desired inter-fiber distance and maintaining voids between the constituent fibers between the sheets. Examples of such nonwoven fabrics that are preferably used include air-through nonwoven fabrics, air-laid nonwoven fabrics, and resin-bonded nonwoven fabrics. The nonwoven fabric 4A of the feces capture layer 4 can be made of one of these nonwoven fabrics alone or a laminate of two or more of these nonwoven fabrics. Among these, air-through nonwoven fabrics and resin-bonded nonwoven fabrics that use fibers with large diameters and high rigidity are preferred, from the viewpoint of maintaining voids between the constituent fibers even when low-viscosity components contained in liquid feces pass through. The low-viscosity component is the portion of stool, particularly liquid stool, remaining after removing the high-viscosity and solid components contained in the stool, and is a highly fluid portion that contains a lot of water.

[0021] Examples of fibers contained in the nonwoven fabric 4A of the feces capture layer 4 include polyolefins such as polyethylene (PE) and polypropylene (PP); polyesters such as polyethylene terephthalate (PET); polyamides such as nylon 6 and nylon 66; and synthetic fibers made of synthetic resins such as polyacrylic acid, polymethacrylic acid alkyl esters, polyvinyl chloride, and polyvinylidene chloride, and one of these can be used alone or two or more can be used in combination.

[0022] The intermediate layer 5 is adjacent to the feces capture layer 4. The intermediate layer 5 serves to receive the low-viscosity components contained in the liquid feces, and also serves to supplementarily absorb the high-viscosity or solid components of the liquid feces when the feces capture layer 4 is unable to absorb these components. The intermediate layer 5 is made of a hydrophilic material, and is preferably made of a fiber sheet 5A (hereinafter also referred to as "sheet 5A"). As the sheet 5A, from the viewpoint of enabling low-viscosity components contained in liquid feces to migrate to the diffusion layer 6, pulp airlaid nonwoven fabric, flap pulp nonwoven fabric, hydrophilic urethane sheet, etc. are preferably used.

[0023] To facilitate the rapid transfer of low-viscosity components contained in liquid stool to the diffusion layer 6, the sheet 5A of the intermediate layer 5 is preferably a nonwoven fabric whose constituent fibers do not have fusion points, such as a flap pulp nonwoven fabric. The use of such a nonwoven fabric increases the freedom of movement of the constituent fibers of the nonwoven fabric, thereby further improving liquid diffusibility.

[0024] The diffusion layer 6 is a portion that serves to diffuse low-viscosity components of urine and liquid feces supplied through the mediation layer 5 in a direction intersecting the thickness direction Z of the layer. The diffusion layer 6 is adjacent to the mediation layer 5. A fiber sheet is preferably used as the material for the diffusion layer 6. In this embodiment, the non-skin-facing side of the sheet 6A constituting the diffusion layer 6 has an extension that extends outward in the width direction Y from the non-skin-facing side of the urine absorbent layer 7, and the extension is rolled up toward the skin-facing side to cover the skin-facing side of the urine absorbent layer 7 (not shown). The sheet 6A of the diffusion layer 6 may be composed of two sheets, in which case one diffusion layer 6 covers the entire non-skin-facing side of the urine absorbent layer 7, and the other diffusion layer 6 covers the entire skin-facing side of the urine absorbent layer 7, and extends outward from both side edges of the urine absorbent layer 7 in the width direction Y, with the extended portions folded down onto the non-skin-facing side of the urine absorbent layer 7 and overlapping with the sheet 6A of the other diffusion layer 6.

[0025] The diffusion layer 6 is composed of a sheet 6A. The sheet 6A of the diffusion layer 6 is preferably arranged so as to cover at least the entire skin-facing surface of the urine absorbent layer 7 in the width direction Y, and more preferably so as to cover the entire skin-facing and non-skin-facing surfaces of the urine absorbent layer 7. This configuration allows low-viscosity components of urine and liquid feces to be quickly transferred to the urine absorbent layer 7.

[0026] To ensure the above-mentioned functions, the sheet 6A of the diffusion layer 6 is preferably made of, for example, a backing such as tissue paper, a spunbond-meltblown-spunbond (SMS) nonwoven fabric, or a sheet. Among these, to more quickly diffuse low-viscosity components of urine and liquid feces in a direction intersecting the thickness direction Z of the layer, it is preferable that the sheet 6A be a fiber sheet and a nonwoven fabric in which the constituent fibers of the fiber sheet are entangled or bonded together. Specifically, it is preferable to use a backing such as tissue paper. The term "entangled" as used herein means that the constituent fibers are sufficiently entangled with each other; it does not include a state in which fiber layers are simply overlapped.

[0027] The urine absorbent layer 7 is adjacent to the diffusion layer 6. The urine absorbent layer 7 is a portion that plays a role in retaining the low-viscosity components diffused by the diffusion layer 6 and the supplied urine. A material containing a superabsorbent polymer can be used as the urine absorbent layer 7. The urine absorbent layer 7 may be made of, for example, a superabsorbent polymer, or may be made of a mixed stack of a superabsorbent polymer and a stack of hydrophilic fibers such as pulp fibers.

[0028] The superabsorbent polymer contained in the urine absorbent layer 7 can generally be a hydrogel material capable of absorbing and retaining water, such as a polymer or copolymer of acrylic acid or an alkali metal acrylate. Examples include polyacrylic acid and its salts, and polymethacrylic acid and its salts, specifically a partial sodium salt of an acrylic acid polymer. The shape of the superabsorbent polymer is not particularly limited, and can be, for example, spherical, tufted, blocky, bale-shaped, fibrous, irregular, or a combination of these particles. When the urine absorbent layer 7 contains hydrophilic fibers, examples of the hydrophilic fibers include pulp fibers, rayon fibers, cotton fibers, and cellulosic fibers such as cellulose acetate. In addition to the hydrophilic cellulosic fibers, fibers made of synthetic resins such as polyolefin, polyester, and polyamide that have been hydrophilized with a surfactant or the like can also be used.

[0029] As described above, the absorbent pad 1 of this embodiment is used by being placed over an absorbent article such as a diaper. That is, the wearer's excrement is excreted into the absorbent pad 1. When urine and liquid feces are excreted into the absorbent pad 1, the urine Q and liquid feces P are taken up by the absorbent pad 1. Even if urination occurs after the excretion of liquid feces P, the liquid feces P does not interfere with the absorption of the urine Q, thereby preventing urinary leakage. The absorption mechanism of the present invention will be explained in more detail. An inclined surface is formed between the tops 21T of the projections 21 and the bottoms 22T of the recesses 22, and even if high-viscosity or solid components of liquid feces P supplied from the skin-facing side are supplied near the tops 21T of the projections 21, they are guided along the inclined surface to the recesses 22 (see FIG. 7(a)), and migrate through the openings 23 in the recesses 22 to the feces capture layer 4 side. After passing through the surface layer 2, the high-viscosity or solid components of liquid feces P reach the skin-facing side of the feces capture layer 4 of the retention layer 3 (see FIG. 7(b)). A skin-facing side feces capture layer 4a is arranged on the skin-facing side of the nonwoven fabric 4A of the feces capture layer 4, and a non-skin-facing side feces capture layer 4b is arranged below the skin-facing side feces capture layer 4a, and the inter-fiber distance between the fibers is smaller than that of the skin-facing side feces capture layer 4a.Therefore, the highly viscous or solid components of the liquid feces P penetrate between the fibers of the skin-facing side feces capture layer 4a (see Figure 7(c)) and are taken up by the non-skin-facing side feces capture layer 4b (see Figure 7(d)).

[0030] On the other hand, the low-viscosity components contained in the liquid feces P rapidly migrate through the openings 23 in the recesses 22 toward the retention layer 3 and reach the feces capture layer 4 (see FIG. 7(b)). The nonwoven fabric 4A constituting the feces capture layer 4 has voids due to the constituent fibers being partially fused or bonded together, so the low-viscosity components of the liquid feces P diffuse through the voids into the nonwoven fabric 4A of the feces capture layer 4 and rapidly migrate to the mediating layer 5 (see FIG. 7(c)). In the mediating layer 5, the low-viscosity components of the liquid feces P diffuse into the sheet 5A of the mediating layer 5 and migrate to the diffusion layer 6 (see FIG. 7(d)). After passing through the mediating layer 5, the low-viscosity components diffuse in the diffusion layer 6 in a direction intersecting the thickness direction Z of the diffusion layer 6 (see FIG. 8(a)), and rapidly migrate to the urine absorbent layer 7 (see FIG. 8(b)). The low viscosity component is then taken in, absorbed and retained in the urine absorbent layer 7 containing the absorbent polymer (see FIG. 8(c)). In this way, the liquid feces P is absorbed and retained mainly through a route centered on the openings 23, and when urine is subsequently excreted, there remains an area that is not used for absorption and retention, so that the liquid supplied to the skin-facing surface is taken up from the surface layer 2 toward the urine absorbent layer 7 mainly via this unused route, and is absorbed and retained in the urine absorbent layer 7 (see Figure 8(c)).

[0031] As explained above, the high-viscosity or solid components contained in liquid feces and the low-viscosity components contained in liquid feces are retained in different locations, and the absorption pathways for liquid feces and urine are separated to some extent. Therefore, when liquid feces are excreted, the high-viscosity or solid components contained in the liquid feces are retained in the non-skin-facing feces capture layer 4b, which prevents clogging of the sheet 6A of the diffusion layer 6 by the high-viscosity or solid components contained in the liquid feces, effectively preventing a decrease in the liquid absorption performance of the absorbent pad 1. This prevents urine leakage even when urination occurs after excretion of liquid feces.

[0032] The sheet 5A of the intermediate layer 5 is preferably a material that does not contain absorbent polymer. This configuration allows low-viscosity components contained in liquid feces to be more smoothly transferred to the diffusion layer 6. Here, "not containing absorbent polymer" means that the absorbent polymer is substantially not contained, meaning that the mass proportion of absorbent polymer is less than 5%.

[0033] As described above, in this embodiment, when the surface layer 2 is viewed from above, the convex portions 21 and the concave portions 22 are arranged alternately and continuously along two different directions that intersect with each other. This allows highly viscous or solid components contained in liquid feces to be guided to the concave portions 22 more quickly.

[0034] From the viewpoint of enabling even faster absorption of low-viscosity components contained in urine and liquid feces, it is preferable that the hydrophilicity of the non-skin-facing side (non-skin-facing side of feces capture layer 4b) of nonwoven fabric 4A of feces capture layer 4, sheet 5A of intermediate layer 5, and sheet 6A of diffusion layer 6 satisfy the following relationship. Diffusion layer ≧ Intermediate layer > Non-skin-facing side of feces capture layer In the present invention, "hydrophilicity" refers to the contact angle of the constituent fibers of the sheet, measured by the method described below, and is determined based on this contact angle. Specifically, high hydrophilicity is synonymous with a small contact angle, and low hydrophilicity is synonymous with a large contact angle. Therefore, in the absorbent pad 1 of this embodiment, the following relationship holds: "contact angle of diffusion layer 6≦contact angle of intermediary layer 5<contact angle of the non-skin-facing side of feces capture layer 4 (contact angle of non-skin-facing side feces capture layer 4b)." Unless otherwise specified, "contact angle" in this specification refers to the contact angle measured by the method described below. In this specification, if the contact angle is 90 degrees or less, the sheet is hydrophilic, and if the contact angle is more than 90 degrees, the sheet is hydrophobic. The contact angle of the non-skin-facing side of the nonwoven fabric 4A of the feces capture layer 4 (non-skin-facing side feces capture layer 4b) is preferably 90 degrees or less, more preferably 85 degrees or less, and preferably 10 degrees or more, more preferably 30 degrees or more; specifically, it is preferably 10 degrees or more and 90 degrees or less, more preferably 30 degrees or more and 85 degrees or less, and even more preferably 40 degrees or more and 85 degrees or less. The contact angle of the sheet 5A of the intermediate layer 5 is preferably 90 degrees or less, more preferably 85 degrees or less, and preferably 20 degrees or more, more preferably 40 degrees or more; specifically, it is preferably 20 degrees or more and 90 degrees or less, more preferably 40 degrees or more and 85 degrees or less, even more preferably 40 degrees or more and 80 degrees or less, and even more preferably 40 degrees or more and 75 degrees or less. The contact angle of the sheet 6A of the diffusion layer 6 is preferably 90 degrees or less, more preferably 85 degrees or less, and preferably 20 degrees or more, more preferably 40 degrees or more; specifically, it is preferably 20 degrees or more and 90 degrees or less, more preferably 40 degrees or more and 85 degrees or less, even more preferably 40 degrees or more and 75 degrees or less, and even more preferably 40 degrees or more and 70 degrees or less.

[0035] <Contact angle measurement method> The nonwoven fabric 4A of the feces capture layer 4, the sheet 5A of the intermediary layer 5, and the sheet 6A of the diffusion layer 6 were used as the measurement targets. A 10 mm x 10 mm square in plan view was cut from the measurement target to serve as a measurement sample, and the water contact angle of this measurement sample was measured. The nonwoven fabric 4A of the feces capture layer 4 was measured on the non-skin-facing side (the feces capture layer 4b side of the non-skin-facing side). The measurement device used was an automatic contact angle meter MCA-J manufactured by Kyowa Interface Science Co., Ltd. Deionized water was used to measure the contact angle. The ink-jet water droplet ejection unit (CTC-25 pulse injector with a 25 μm nozzle diameter manufactured by Cluster Technology Co., Ltd.) was set to 20 picoliters, and a water droplet was dropped directly onto the fiber. The droplet dropping was recorded on a high-speed video recorder connected to a horizontally mounted camera. A personal computer equipped with a high-speed capture device is recommended for later image analysis. Images were recorded every 17 msec during this measurement. In the recorded video, the first image of the water droplet landing on the fiber is analyzed using the included software FAMAS (software version 2.6.2, analysis method: sessile drop method, analysis method: θ / 2 method, image processing algorithm: non-reflective, image processing image mode: frame, threshold level: 200, no curvature correction), and the angle between the surface of the water droplet in contact with the air and the fiber is calculated, which is taken as the contact angle. A measurement sample cut from the object to be measured is placed on the sample stage of the contact angle meter and maintained horizontally. Contact angles are measured at two different locations for each measurement sample. The contact angles of N=5 samples are measured to one decimal place, and the average value (rounded to two decimal places) of the measured values ​​at a total of 10 locations is defined as the contact angle of the measurement sample with water. The measurement environment is a room temperature of 22±2°C and a humidity of 65±2%RH. If the sheet to be measured is bonded to another member of the absorbent pad by adhesive or fusion, the adhesive force is removed by spraying cold air onto the bonded portion, for example, before removal. This method of removal from the absorbent pad can also be used for other measurements.

[0036] From the viewpoint of more quickly absorbing high-viscosity or solid components contained in liquid feces, it is preferable that the fiber diameter of the constituent fibers on the skin-facing side of the nonwoven fabric 4A of the feces capture layer 4 is larger than the fiber diameter of the constituent fibers on the non-skin-facing side. The fiber diameter on the skin-facing side of nonwoven fabric 4A is preferably 50 μm or less, more preferably 40 μm or less, preferably 10 μm or more, more preferably 20 μm or more, preferably 10 μm or more and 50 μm or less, more preferably 20 μm or more and 40 μm or less, and even more preferably 25 μm or more and 40 μm or less. The fiber diameter on the non-skin-facing side of nonwoven fabric 4A is preferably 40 μm or less, more preferably 35 μm or less, preferably 10 μm or more, more preferably 15 μm or more, preferably 10 μm or more and 40 μm or less, more preferably 15 μm or more and 35 μm or less, and even more preferably 15 μm or more and 30 μm or less. The fiber diameter on the non-skin-facing side of nonwoven fabric 4A is preferably 0.40 times or more, more preferably 0.45 times or more, and preferably 0.90 times or less, more preferably 0.85 times or less, and is preferably 0.40 to 0.90 times, more preferably 0.45 to 0.85 times, and even more preferably 0.50 to 0.80 times the fiber diameter on the skin-facing side of nonwoven fabric 4A.

[0037] <Method for measuring fiber diameter> The nonwoven fabric 4A of the feces capture layer 4 is used as the sheet to be measured. The sheet to be measured is cut with a razor (e.g., a single-edged razor manufactured by Feather Safety Razor Co., Ltd.) to obtain a test piece having a rectangular shape (8 mm x 4 mm) in plan view. When cutting the test piece, care must be taken to ensure that the structure of the cut surface of the test piece formed by the cutting is not destroyed by pressure during cutting. A preferred method for cutting the test piece is to place the test piece in liquid nitrogen to thoroughly freeze it prior to cutting, and then cut it. The test piece is attached to a sample stage using double-sided tape (Nichiban Co., Ltd., Nicetack NW-15). The test piece is then platinum-coated. For the coating, an ion sputtering device E-1030 (product name) manufactured by Hitachi Naka Seiki Co., Ltd. is used, and the sputtering time is 30 seconds. The cut surface of the test piece is observed at 1000x magnification using a Hitachi, Ltd., S-4000 field emission scanning electron microscope. Since the feces capture layer 4 has a skin-facing side feces capture layer 4a and a non-skin-facing side feces capture layer 4b, the boundary between the skin-facing side feces capture layer 4a and the non-skin-facing side feces capture layer 4b is identified from the electron microscope image based on the difference in density between the fibers, and the fiber diameter is measured from the fiber cross-sections of 10 randomly selected fibers for each layer (skin-facing side feces capture layer 4a or non-skin-facing side feces capture layer 4b), and the arithmetic average value is taken as the fiber diameter. If the sheet to be measured is a single layer, the sheet to be measured is divided into three equal parts in the thickness direction, and the fiber diameters of the fibers in the part located on the skin-facing side and the part located on the non-skin-facing side are measured. If the sheet to be measured is three or more layers, the fiber diameters of the fibers in the layer located closest to the skin-facing side and the layer located closest to the non-skin-facing side are measured.

[0038] As described above, the inter-fiber distance on the non-skin-facing side of the feces capture layer 4 is smaller than the inter-fiber distance on the skin-facing side of the feces capture layer 4. This allows for more rapid absorption of highly viscous or solid components contained in liquid feces. The inter-fiber distance on the skin-facing side of the nonwoven fabric 4A (skin-facing side feces capture layer 4a) is preferably 600 μm or less, more preferably 550 μm or less, and preferably 70 μm or more, more preferably 100 μm or more, preferably 70 μm or more and 600 μm or less, more preferably 100 μm or more and 550 μm or less, and even more preferably 120 μm or more and 540 μm or less. The inter-fiber distance on the non-skin-facing side of the nonwoven fabric 4A (non-skin-facing side feces capture layer 4b) is preferably 200 μm or less, more preferably 180 μm or less, and preferably 50 μm or more, more preferably 70 μm or more, preferably 50 μm or more to 200 μm or less, more preferably 70 μm or more to 180 μm or less, and even more preferably 75 μm or more to 160 μm or less. The inter-fiber distance on the non-skin-facing side of nonwoven fabric 4A (non-skin-facing side feces capture layer 4b) is preferably at least 0.1 times, more preferably at least 0.15 times, and preferably at most 0.80 times, more preferably at most 0.75 times, and also preferably at least 0.1 times but at most 0.80 times, more preferably at least 0.15 times but at most 0.75 times, and more preferably at least 0.17 times but at most 0.70 times. The inter-fiber distance is measured by the following method.

[0039] <Method for measuring interfiber distance> The interfiber distance of a fiber assembly such as a fiber sheet can be calculated using the following formula (1) based on Wrotnowski's assumption. Formula (1) is generally used to calculate the interfiber distance of a fiber assembly. Under Wrotnowski's assumption, the fibers are cylindrical and are regularly arranged without crossing each other. First, the inter-fiber distance in each of the skin-facing side feces trapping layer 4a and the non-skin-facing side feces trapping layer 4b is calculated using the following formula (1). In this case, the thickness t, basis weight W, fiber resin density ρ, and fiber diameter D used in the following formula (1) are those for the skin-facing side feces collection layer 4a and non-skin-facing side feces collection layer 4b to be measured, respectively. The thickness t, basis weight W, and fiber diameter D are each the average values ​​measured at multiple measurement points. The thickness t (mm) is measured using the following method. The nonwoven fabric 4A of the feces capture layer 4 is used as the sheet to be measured. First, the sheet to be measured is cut into a piece measuring 50 mm in the longitudinal direction and 50 mm in the transverse direction. However, if it is not possible to prepare a piece of the sheet to be measured of this size, a piece as large as possible is prepared. Next, the cut piece is placed on a flat plate, and a flat glass plate is placed on top of it. Weights are evenly placed on the glass plate so that the load including the glass plate is 49 Pa, and the thickness of the cut piece is then measured. The measurement environment is a temperature of 20±2°C and a relative humidity of 65±5%, and a microscope (Keyence Corporation, VHX-1000) is used as the measuring device. To measure the thickness of the cut piece, first, an enlarged photograph of the cut surface of the cut piece is taken. An object with known dimensions is also photographed on this enlarged photograph. Next, a scale is fitted to an enlarged photograph of the cut surface of the cut piece, and the thickness of each of the skin-facing side feces capture layer 4a and non-skin-facing side feces capture layer 4b of the cut piece is measured. The above procedure is carried out three times, and the average value of the three measurements is taken as the thickness t of the skin-facing side feces capture layer 4a and non-skin-facing side feces capture layer 4b.

[0040] The skin-facing side feces capture layer 4a and the non-skin-facing side feces capture layer 4b can be distinguished from each other on the cut surface of the cut piece by the following method. As mentioned above, the skin-facing side feces capture layer 4a has a lower fiber density than the non-skin-facing side feces capture layer 4b, so two regions with different fiber abundances (densities) can be observed on the cut surface of the cut piece. Specifically, the region with a higher fiber content is the non-skin-facing side feces capture layer 4b, and the region with a lower fiber content is the skin-facing side feces capture layer 4a. These can be distinguished with the naked eye.

[0041] Basis weight W(g / m 2The basis weight W (g / m) is calculated by cutting the sheet to be measured to a predetermined size (for example, 12 cm x 6 cm), pinching and pulling the skin-facing and non-skin-facing sides of the sheet to be measured, for example, with the fingers to separate it into the skin-facing side feces capture layer 4a and the non-skin-facing side feces capture layer 4b, measuring the mass of each, and dividing the measured mass by the area calculated from the predetermined size ("basis weight W (g / m)"). 2 ) = mass ÷ area calculated from a given size). If it is difficult to separate the sheet to be measured, cold spray or the like may be used as necessary. This measurement is repeated four times, and the average value is used as the basis weight. If the sheet to be measured has three or more layers, the measurement is performed in the same manner as above. If the sheet to be measured is a single layer, the sheet to be measured is cut to a given size, and after measuring the mass, the measured mass is divided by the area of ​​the sheet to be measured. The resin density ρ (g / cm2) of the fiber is measured using a density gradient tube in accordance with the density gradient tube method described in JIS L1015 Test Methods for Chemical Fiber Staples (URL: http: / / kikakurui.com / l / L1015-2010-01.html, or in the book JIS Handbook Fibers-2000 (Japanese Standards Association), pages 764-765). The fiber diameter D (μm) is determined by measuring the cross sections of 10 fibers collected from the skin-facing side feces trapping layer 4a and the non-skin-facing side feces trapping layer 4b using a field emission scanning electron microscope, S-4000, manufactured by Hitachi, Ltd. The average value of the measured values ​​is used as the fiber diameter D (μm). The method for measuring the fiber diameter D is in accordance with the above-mentioned <Method for Measuring Fiber Diameter>.

[0042]

number

[0043] When a porous body, such as a urethane sheet, is used as the measurement target, the pore diameter of the porous body is used as the inter-fiber distance. The pore diameter of the porous body is measured by the following measurement method. The sheet to be measured is cut with a razor (e.g., a single-edged razor manufactured by Feather Safety Razor Co., Ltd.) to obtain a test piece having a rectangular shape (8 mm x 4 mm) in plan view. When cutting the test piece, care must be taken to ensure that the structure of the cut surface of the test piece formed by the cutting is not destroyed by pressure during cutting. A preferred method for cutting the test piece is to place the test piece in liquid nitrogen to thoroughly freeze it before cutting. The test piece is attached to the sample stage using double-sided tape (Nichiban Co., Ltd., Nicetack NW-15). The test piece is then platinum-coated. For the coating, an ion sputtering device E-1030 (product name) manufactured by Hitachi Naka Seiki Co., Ltd. is used, and the sputtering time is 30 seconds. The cut surface of the test piece was observed at 1000x magnification using a Hitachi S-4000 field emission scanning electron microscope, and 10 porous pores were randomly selected from the two-dimensional image. Their maximum diameters were directly read, and the arithmetic mean value of these was taken as the pore diameter of the porous body.

[0044] When the intermediary layer 5 and the diffusion layer 6 are made of fiber sheets, from the viewpoint of enabling faster absorption of low-viscosity components contained in urine and liquid feces, it is preferable that the inter-fiber distances on the non-skin-facing side (non-skin-facing side of the feces capture layer 4b) of the nonwoven fabric 4A of the feces capture layer 4, the sheet 5A of the intermediary layer 5, and the sheet 6A of the diffusion layer 6 satisfy the following relationship. Non-skin-facing side of feces capture layer (non-skin-facing side of feces capture layer) > Intermediate layer > Diffusion layer The inter-fiber distance on the non-skin-facing side of the nonwoven fabric 4A of the feces capture layer 4 (the non-skin-facing side of the feces capture layer 4b) is preferably 200 μm or less, more preferably 180 μm or less, and preferably 50 μm or more, more preferably 70 μm or more; specifically, it is preferably 50 μm or more and 200 μm or less, more preferably 70 μm or more and 180 μm or less, and even more preferably 75 μm or more and 160 μm or less. The inter-fiber distance of the sheet 5A of the intermediate layer 5 is preferably 100 μm or less, more preferably 80 μm or less, and preferably 10 μm or more, more preferably 20 μm or more; specifically, it is preferably 10 μm or more and 100 μm or less, more preferably 20 μm or more and 85 μm or less, even more preferably 20 μm or more and 80 μm or less, and even more preferably 25 μm or more and 75 μm or less. The inter-fiber distance of the sheet 6A of the diffusion layer 6 is preferably 80 μm or less, more preferably 60 μm or less, and is preferably greater than 0 μm, more preferably 2 μm or more; specifically, it is preferably greater than 0 μm and less than 80 μm, preferably 2 μm or more and 60 μm or less, and more preferably 2 μm or more and 50 μm or less. The inter-fiber distances of the sheet 5A of the intermediate layer 5 and the sheet 6A of the diffusion layer 6 are also measured by the above-mentioned method for measuring inter-fiber distances.

[0045] The inter-fiber distance on the non-skin-facing side (non-skin-facing side of the feces capture layer 4b) of the nonwoven fabric 4A of the feces capture layer 4 is preferably at least 1.2 times, more preferably at least 1.4 times, and preferably 10 times or less, more preferably 8 times or less, and preferably 1.2 times or more and 10 times or less, preferably 1.4 times or more and 8 times or less, and more preferably 2 times or more and 6 times or less, of the inter-fiber distance of the sheet 5A of the intermediate layer 5. The inter-fiber distance on the non-skin-facing side (non-skin-facing side of the feces capture layer 4b) of the nonwoven fabric 4A of the feces capture layer 4 is preferably at least 3 times, more preferably at least 5 times, and preferably 20 times or less, more preferably 16 times or less, and preferably 3 to 20 times, more preferably 5 to 16 times, and more preferably 7 to 14 times, the inter-fiber distance of the sheet 6A of the diffusion layer 6. The interfiber distance of the sheet 5A of the intermediate layer 5 is preferably 1.2 times or more, more preferably 1.4 times or more, and preferably 15 times or less, more preferably 13 times or less, and preferably 1.2 times or more and 15 times or less, more preferably 1.4 times or more and 13 times or less, and more preferably 2 times or more and 10 times or less, of the interfiber distance of the sheet 6A of the diffusion layer 6.

[0046] Furthermore, the uneven sheet 2A of the surface layer 2 allows the projections 21 to return to their original shape even if they are crushed by body pressure and inward pressing forces from the wearer's thighs when worn, allowing excreted body fluid to be quickly absorbed into the absorbent core, suppressing diffusion of excreted body fluid on the surface of the uneven sheet 2A of the surface layer 2, and suppressing return of body fluid absorbed into the urine absorbent layer 7. From these viewpoints, the compressibility of the uneven sheet 2A of the surface layer 2 is preferably 5% or more, more preferably 10% or more, and preferably 98% or less, more preferably 95% or less, preferably 5% to 98%, more preferably 10% to 95%, and more preferably 30% to 90%. The compressibility of the uneven sheet 2A can be measured using a KES compression tester. The higher the value measured using the KES compression tester, the better the cushioning properties can be evaluated. The compression rate of the textured sheet 2A measured with a KES compression tester is specified in "Standardization and Analysis of Texture Evaluation (2nd Edition)" (by Kawabata Toshio, published by the Texture Measurement and Standardization Research Committee of the Textile Machinery Society of Japan (July 10, 1980) and is a physical property related to the compression characteristics of fabric. The method for measuring the compression rate of the textured sheet 2A of the surface layer 2 using a KES compression tester is as follows.

[0047] <Method for measuring compression ratio> The measurement device used was a KES-FB3 compression tester manufactured by Kato Tech Co., Ltd. This tester was used to measure the compression area of ​​2 cm. 2 0.5gf / cm of the sample (concave-convex sheet 2A of surface layer 2) 2 The thickness T0 under load is measured. Next, the sample is compressed at a pressure rate of 20 μm / sec. The load increases as the sample is compressed. The compression load is 35 gf / cm 2 Continue until it reaches 35gf / cm 2 Thickness under load Tm Measure the thickness from T0 to T m The compression ratio (%) of the embossed sheet 2A of the surface layer 2 measured by the compression tester is calculated by dividing the value obtained by subtracting T by the thickness T and multiplying this by 100. In other words, the compression ratio (%) is calculated by the following formula: (T - T m ) / T0×100.

[0048] The compression energy of the uneven sheet 2A of the surface layer 2 is preferably 0.98 mN·m / cm from the viewpoint of the comfort of the texture when the convex portions 21 contact the skin due to the body pressure when worn and the inward pressing force from the wearer's thighs, and the convex portions 21 following the movement of the body. 2 More preferably, 3.43 mN·m / cm 2 or more, preferably 9.8 mN m / cm 2 Less than or equal to 6.86 mN m / cm, preferably 6.86 mN m / cm 2 less than or equal to 0.98 mN m / cm 2 More than 9.8mN m / cm 2 or less, and more preferably 3.43 mN m / cm 2 More than 6.86mN m / cm 2 The compression energy of the uneven sheet 2A of the surface layer 2 can be measured using a KES compression tester. The larger the WC value measured using the KES compression tester, the more easily the uneven sheet 2A is evaluated to be crushed. The method for measuring the compression energy of the uneven sheet 2A using the KES compression tester is as follows.

[0049] <Method for measuring compression energy> The measurement device used was a Kato Tech KES-G5 handy compression tester. Using this tester, a 5 cm x 10 cm sample (concave-convex sheet 2A) was prepared and attached to the test table. Next, the sample was compressed to an area of ​​2 cm. 2 The sheet is compressed between steel plates with circular flat surfaces. The compression speed is 20 μm / sec and the maximum compression load is 4.9 kPa. The recovery process is also measured at the same speed. The compression energy (WC) of the textured sheet 2A is expressed by the following formula: T m , T0 and P are 3.43 kPa (35 gf / cm 2) Thickness under load, 49 Pa (0.5 gf / cm 2 ) indicates the thickness under load and the load at the time of measurement.

[0050]

number

[0051] Next, preferred configurations and the like of each of the above-described embodiments will be described in detail. Regarding the thickness of the embossed sheet 2A, the overall thickness of the embossed sheet 2A when viewed from the side as shown in FIG. 4 is the sheet thickness T S Sheet thickness T S The thickness may be adjusted as appropriate depending on the application, but is preferably 1 mm or more and 6 mm or less, and more preferably 1.2 mm or more and 5 mm or less. By setting the thickness within this range, the body fluid absorption rate during use can be fast, and suitable cushioning properties can also be achieved. The basis weight of the embossed sheet 2A may be selected appropriately depending on the application. For example, the average weight of the entire sheet is 10 g / m 2 More than 50g / m 2 Less than 20 g / m is preferred 2 More than 45g / m 2 The following is more preferred:

[0052] From the viewpoint of further improving the migration of high-viscosity or solid components contained in liquid stool and making it easier for high-viscosity or solid components contained in liquid stool to pass through, the size of the openings 23, i.e., the opening width, is preferably 0.2 mm or more, more preferably 0.5 mm or more, and also preferably 5.0 mm or less, more preferably 4.8 mm or less, and also preferably 0.2 mm or more and 5.0 mm or less, more preferably 0.5 mm or more and 4.8 mm or less. The openings 23 are parts having a lower fiber density than the surrounding areas of the recesses 22.

[0053] The fiber density of the peripheral portion of the bottom portion 22T is preferably 120 fibers / mm 3 in order to make it difficult to be crushed under a high load and to reduce the amount of liquid returning. 2 More preferably, 150 lines / mm 2 or more, and preferably 500 lines / mm2 Less than or equal to 450 lines / mm, preferably 2 Less than 120 lines / mm, preferably 2 Over 500 lines / mm 2 Less than or equal to 120 lines / mm, preferably 2 Over 450 lines / mm 2 More preferably, 150 lines / mm or less 2 Over 450 lines / mm 2 More preferably, 150 lines / mm or less 2 Over 330 lines / mm 2 The following is the result. From the viewpoint of further improving the migration of high-viscosity or solid components contained in liquid stool and making it easier for high-viscosity or solid components contained in liquid stool to pass through, the fiber density of the openings 23 is preferably 0 fibers / mm 2 More preferably, 20 lines / mm 2 or more, and preferably 180 lines / mm 2 Less than or equal to 150 lines / mm, more preferably 2 Less than or equal to 0 fibers / mm 2 Over 180 lines / mm 2 Less than or equal to 0 fibers / mm 2 Over 150 lines / mm 2 More preferably, 20 fibers / mm or less 2 Over 150 lines / mm 2 The following is the result. Fiber density is 1mm 2 The fiber density was evaluated by counting the number of fibers per unit area. The fiber density was measured as follows.

[0054] <Measurement of fiber density> The concave-convex sheet 2A was cut, and the cut surface was magnified and observed using a scanning electron microscope, and the cross-sectional area of ​​the cut fibers in the cut surface per unit area was counted. The magnification for the magnified observation was adjusted to a magnification (150x to 500x) that allowed measurement of approximately 30 to 60 fiber cross sections. Next, 2 This is converted into the number of fiber cross sections per unit area, and the fiber density (fibers / mm 2 The measurement was carried out at three locations for each sample, and the average was taken as the fiber density of the sample. The scanning electron microscope used was JCM-5100 (trade name) manufactured by JEOL Ltd.

[0055] From the viewpoint of more reliably ensuring the retention capacity of liquid feces, the basis weight of the nonwoven fabric 4A of the feces capture layer 4 is preferably 15 g / m 2 More preferably, 20 g / m 2 or more, and preferably 80 g / m 2 Less than 70 g / m 2 or less, and preferably 15 g / m 2 More than 80g / m 2 Less than 20 g / m, more preferably 2 More than 70g / m 2 More preferably 30 g / m or less 2 More than 60g / m 2 The following is the result. From the same viewpoint as above, the basis weight of the nonwoven fabric of the skin-facing side feces capture layer 4a is preferably 10 g / m 2 More preferably, 12 g / m 2 and preferably 50 g / m 2 Less than 40 g / m 2 and preferably 10 g / m 2 More than 50g / m 2 or less, more preferably 12 g / m 2 More than 40g / m 2 More preferably 12 g / m or less 2 More than 35g / m 2 The following is the result. From the same viewpoint as above, the basis weight of the nonwoven fabric of the non-skin-facing side feces capture layer 4b is preferably 10 g / m 2 More preferably, 12 g / m 2 and preferably 50 g / m 2 Less than 40 g / m 2 and preferably 10 g / m 2 More than 50g / m 2 or less, more preferably 12 g / m 2 More than 40g / m 2 The following is the result.

[0056] From the viewpoint of further improving the migration of low-viscosity components contained in liquid stool, the basis weight of the sheet 5A of the intermediate layer 5 and the sheet 6A of the diffusion layer 6 is preferably within the following ranges. The basis weight of the sheet 5A of the intermediate layer 5 is preferably 100 g / m 2 More preferably, 150 g / m 2 or more, and preferably 400 g / m 2 or less, more preferably 350 g / m 2 and preferably 100 g / m 2 More than 400g / m 2 or less, more preferably 150 g / m 2 More than 350g / m 2 The following is the result. The basis weight of the sheet 6A of the diffusion layer 6 is preferably 8 g / m 2 More preferably, 10 g / m 2 or more, and preferably 30 g / m 2 Less than 25 g / m 2 and preferably 8 g / m 2 More than 30g / m 2 Less than 10 g / m, more preferably 2 More than 25g / m 2 The following is the result.

[0057] In the absorbent pad 1, adhesive is applied between the uneven sheet 2A of the surface layer 2 and the nonwoven fabric 4A of the feces capture layer 4, between the nonwoven fabric 4A of the feces capture layer 4 and the sheet 5A of the intermediate layer 5, between the sheet 5A of the intermediate layer 5 and the sheet 6A of the diffusion layer 6, and between the sheet 6A of the diffusion layer 6 and the urine absorbent layer 7. The adhesive can be applied using known means, such as a slot coat gun, spiral spray gun, spray gun, or dot gun, and in the absorbent pad 1, it is preferable to apply the adhesive in a spiral pattern using a spiral spray gun. For example, a hot melt adhesive is preferably used as the adhesive to be applied. The amount of hot melt adhesive to be applied is 0.5 g / m2 or more and 50 g / m2 or less. 2 It is preferable that: It's fine.

[0058] The present invention has been described above based on its preferred embodiments, but the absorbent pad of the present invention is not limited to the absorbent pad 1 of the above embodiment and can be modified as appropriate. For example, as shown in Fig. 3, the textured sheet 2A of the surface layer 2 of the absorbent pad 1 has a plurality of convex portions 21 each having an internal space S1 and a plurality of concave portions 22 each having an internal space S2, and when the surface layer 2 is viewed in plan, the convex portions 21 and the concave portions 22 are arranged alternately and continuously along two different directions that intersect with each other, but it is sufficient that the sheet has a plurality of convex portions 21 each having an internal space S1 and a plurality of concave portions 22 each having an internal space S2. For example, as shown in Fig. 5, the sheet may have a textured structure in which convex portions 24 each having a streak-like internal space S3 extending in the vertical direction X1 and concave portions 25 each having a streak-like internal space S4 extending in the vertical direction X1 are arranged alternately in the width direction Y1. As shown in FIG. 6, the absorbent pad 1a may have slits (through holes) 26 in the support layer 3. [Explanation of symbols]

[0059] 1 absorbent pad 2 Surface layer 2A Textured sheet 3 Retention layer 4 Fecal trapping layer 4a: Skin-facing side feces capture layer 4b Non-skin facing side feces trapping layer 4A nonwoven fabric 5 Intermediary layer 5A, 6A seats 6 Diffusion layer 7. Urine absorption layer 21,24 Convex part 21H opening 21T top 21W wall 22,25 Recess 22H opening 22T bottom 22W wall 23 Open hole

Claims

1. a surface layer having a protrusion protruding toward the skin side and a recess having an opening at the bottom; a feces capture layer made of a single-layer or multi-layer nonwoven fabric in which the inter-fiber distance on the skin-facing side that contacts the surface layer is greater than the inter-fiber distance on the non-skin-facing side, and which captures high-viscosity or solid components of liquid feces supplied through the perforations; an intermediate layer made of a hydrophilic material and adapted to receive low-viscosity components contained in the liquid feces; a diffusion layer that diffuses the low-viscosity component supplied through the intermediate layer in a direction perpendicular to the thickness direction of the absorbent pad; a urine absorption layer containing a highly absorbent polymer and retaining the low-viscosity component diffused by the diffusion layer and the supplied urine; The absorbent pad is provided with the above components in this order from the skin-facing side to the non-skin-facing side of the absorbent pad.

2. 2. The absorbent pad according to claim 1, wherein the intermediate layer is free of absorbent polymers.

3. 2. The absorbent pad according to claim 1, wherein the nonwoven fabric constituting the feces-catching layer has voids formed by fusion or bonding of fibers to each other.

4. 2. The absorbent pad according to claim 1, wherein the hydrophilicity of the non-skin-facing side of the nonwoven fabric constituting the feces capture layer, the member constituting the intermediate layer, and the member constituting the diffusion layer satisfies the following relationship: Diffusion layer ≧ intermediary layer > non-skin-facing side of feces capture layer

5. 2. The absorbent pad of claim 1, wherein the nonwoven fabric constituting the feces capture layer has a laminated structure of air-through, air-laid or resin-bonded nonwoven fabric, and the fiber diameter of the constituent fibers of the nonwoven fabric on the skin-facing side is larger than the fiber diameter of the constituent fibers of the nonwoven fabric on the non-skin-facing side.

6. An absorbent pad as described in claim 1, wherein the intervening layer and the diffusion layer are made of fiber sheets, and the inter-fiber distance between the non-skin-facing side of the fiber sheet of the feces capture layer, the fiber sheet of the intervening layer, and the fiber sheet of the diffusion layer satisfies the following relationship. Non-skin-facing side of feces capture layer > intermediary layer > diffusion layer

7. The absorbent pad according to claim 1 , wherein, when the surface layer is viewed in plan, the convex portions and the concave portions are arranged alternately and continuously along two different directions that intersect with each other.

8. 2. The absorbent pad according to claim 1, wherein the intermediate layer is made of a fiber sheet, and the fiber sheet is a nonwoven fabric in which the constituent fibers do not have fusion points.

9. The absorbent pad has a width direction and a longitudinal direction perpendicular to the width direction, 2. The absorbent pad according to claim 1, wherein the sheet constituting the diffusion layer is disposed so as to cover at least the entire width of the surface of the urine absorbent layer facing the skin.

10. 2. The absorbent pad according to claim 1, wherein the diffusion layer is made of a fibrous sheet, and the constituent fibers of the fibrous sheet are entangled or bonded to each other.

11. An absorbent article comprising the absorbent pad according to any one of claims 1 to 10 and a diaper in which the absorbent pad is used by being placed on the skin-facing side.

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