Absorbent article

Abstract

To provide an absorbent article capable of suppressing leakage of discharged liquid such as urine that has reached an end portion of a compressed portion.SOLUTION: An absorbent article includes: an absorbent having a length along a longitudinal direction corresponding to a front-back direction of a wearer, a length along a width direction orthogonal to the longitudinal direction, an absorbent mat, and a first water-permeable sheet disposed on a skin surface side of the wearer of the absorbent mat; a compressed groove provided on the skin surface side of the absorbent; a second water-permeable sheet adhering to the skin surface side of the first water-permeable sheet and having a shape along the compressed groove; and a weak adhesion portion in which an adhesive force between the first water-permeable sheet and the second water-permeable sheet on an end portion side of the compressed groove is weaker than that on a central portion side of the compressed groove.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Absorbent articles such as disposable diapers, absorbent pads, and sanitary products have been developed. The absorbent articles include an absorbent body that absorbs liquids such as urine excreted by the wearer. For example, Patent Document 1 discloses an absorbent article that includes compressed grooves formed by compression. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-103782 Summary of the Invention [Problem to be solved by the invention]

[0004] The compressed grooves spread excreted liquids such as urine excreted by the wearer throughout the entire absorbent body, allowing the entire absorbent body to efficiently absorb excreted liquids such as urine. However, if the ends of the compressed grooves are provided close to the ends of the absorbent body, there is a risk that excreted liquids such as urine will reach the ends of the compressed grooves and leak out of the absorbent body.

[0005] An object of the present invention is to provide an absorbent article that prevents leakage of excreted liquid such as urine that has reached the end of a compressed portion. [Means for solving the problem]

[0006] An absorbent article according to one aspect of the present invention comprises: a length along a longitudinal direction corresponding to the front-to-back direction of the wearer; a length along a width direction perpendicular to the longitudinal direction; an absorbent body having an absorbent mat and a first water-permeable sheet arranged on the wearer's skin side of the absorbent mat; A compressed groove provided on the skin side of the absorbent body; A second water-permeable sheet that is adhered to the skin side of the first water-permeable sheet and has a shape that follows the compressed grooves; The compression groove has a weak adhesive portion where the adhesive strength between the first water-permeable sheet and the second water-permeable sheet is weaker on the end side than on the central side of the compression groove. [Effects of the Invention]

[0007] According to the present invention, leakage of excreted liquid such as urine that has reached the end of the compressed portion can be suppressed. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing the appearance of a diaper according to an embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the diaper according to the embodiment. [Figure 3] FIG. 3 is a plan view of the diaper according to the embodiment. [Figure 4] FIG. 4 is a cross-sectional view of a diaper according to an embodiment. [Figure 5] FIG. 5 is a diagram showing a compression portion provided on a diaper according to an embodiment. [Figure 6] FIG. 6 is an enlarged view of a compression portion provided on the diaper according to the embodiment. [Figure 7] FIG. 7 is a cross-sectional view of the diaper according to the embodiment in a state where the leakage barrier walls are erected. [Figure 8] FIG. 8 is a diagram showing a non-adhesive portion provided on a diaper according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes an embodiment of the present invention. The embodiment described below is one aspect of the present invention, and does not limit the technical scope of the present invention.

[0010] <Embodiment> In this embodiment, the longitudinal direction of a tape-type disposable diaper (an example of an "absorbent article" in the present application, hereinafter simply referred to as "diaper") is the direction connecting the front body portion, which is positioned opposite the wearer's abdomen, and the back body portion, which is positioned opposite the wearer's back. Between the front body portion (one side in the longitudinal direction) and the back body portion (the other side in the longitudinal direction) (the center in the longitudinal direction), a crotch portion, which is positioned between the wearer's crotch (facing the crotch), is located. Furthermore, when the diaper is worn by a wearer (hereinafter abbreviated as "worn state"), the side facing the wearer's skin (the inner side when worn) is the skin-facing side, and the side opposite the skin-facing side (the outer side when worn) is the non-skin-facing side. Furthermore, the direction connecting the skin-facing side and the non-skin-facing side is the thickness direction, and the direction perpendicular to both the longitudinal direction and the thickness direction is the width direction. Furthermore, a view from the thickness direction is a planar view. The left-right direction of the diaper is defined as the right side of the wearer's right hand and the left side of the wearer's left hand when the diaper is worn.

[0011] FIG. 1 is a perspective view of a diaper 1 according to this embodiment. FIG. 2 is an exploded perspective view of the diaper 1 according to this embodiment. FIG. 3 is a plan view of the diaper 1 in a stretched state, viewed from the skin-facing side. The diaper 1 has a crotch region 1B, which corresponds to the crotch area covering the wearer's genitals when worn; a front body region 1F, which is located in front of the crotch region 1B and corresponds to the wearer's front body; and a back body region 1R, which is located behind the crotch region 1B and corresponds to the wearer's back body. Tapes 2L and 2R are attached to the left and right edges of the back body region 1R, and can be attached to front patches 2F, which are provided on the non-skin-facing side of the front body region 1F. When the front body region 1F is positioned on the wearer's abdominal side and the back body region 1R is positioned on the wearer's back side, the diaper 1 is secured to the wearer's body by encircling the wearer's abdominal circumference and thighs. Since the diaper 1 is fixed to the wearer's body in this manner, the wearer can stand and walk around while wearing the diaper 1.

[0012] The diaper 1 includes an absorbent body 6, which is capable of absorbing and retaining exudates discharged by the wearer, and is located mainly near the crotch region 1B. The diaper 1 also includes leg gathers 3AL, 3AR around the wearer's legs (thighs) to prevent gaps from forming between the diaper 1 and the wearer's skin, which could serve as a path for exudates to escape. Leakage barrier walls 3BL, 3BR are provided on the inside of the leg gathers 3AL, 3AR in the width direction of the diaper 1. The leg gathers 3AL, 3AR and the leakage barrier walls 3BL, 3BR adhere closely to the wearer's skin due to the elasticity of the elastic members. Therefore, exudates discharged from the wearer's genitals are absorbed by the absorbent body 6 of the diaper 1 without leaking out. The elastic members may be selected from thread-like or strip-like rubber, as appropriate.

[0013] The diaper 1 has a cover sheet 4 that forms the outer surface when worn. The cover sheet 4 is a sheet-like member having a substantially rectangular appearance with constrictions 4KL, 4KR at the positions corresponding to the long sides, and forms the exterior surface of the diaper 1. The constrictions 4KL, 4KR are provided at the positions where the wearer's thighs are located. The cover sheet 4 is provided to reinforce the back sheet 5 (described later) and to improve the feel. For example, in order to prevent leakage of excrement, a nonwoven fabric made of a liquid-impermeable thermoplastic resin can be used as the material for the cover sheet 4. Examples of liquid-impermeable thermoplastic resins include polyethylene (PE) and polypropylene (PP). The cover sheet 4 is not limited to a single-layer structure, and may be made of a material having an inner cover sheet and an outer cover sheet. It may have a multi-layer structure.

[0014] The diaper 1 further comprises a back sheet 5, an absorbent body 6, and a top sheet 8 (an example of the "second water-permeable sheet" referred to in the present application), which are layered in this order on the wearer's skin-facing side of the cover sheet 4. The top sheet 8 may consist of a single sheet, or multiple sheets may be layered together. The back sheet 5, the absorbent body 6, and the top sheet 8 are all sheet-like members having a substantially rectangular appearance, and are layered in this order on the cover sheet 4 with their longitudinal directions aligned with the longitudinal direction of the cover sheet 4. Like the cover sheet 4, the back sheet 5 is a sheet made of a liquid-impermeable thermoplastic resin material to prevent leakage of excrement. The back sheet 5 is preferably made of a moisture-permeable material to prevent stuffiness when worn.

[0015] The top sheet 8 is the portion that contacts the wearer's skin when the diaper 1 is worn, and is a water-permeable sheet made of a liquid-permeable material that allows excreted liquids such as urine to pass through. The top sheet 8 may be made of a woven fabric, a nonwoven fabric, a porous film, or the like. The nonwoven fabric may be made of thermoplastic resin fibers such as polypropylene, polyethylene, polyester, or nylon that have been hydrophilically treated. Alternatively, air-through nonwoven fabric, point-bonded nonwoven fabric, spun-bonded nonwoven fabric, or melt-blown nonwoven fabric may be used. When the diaper 1 is worn, excreted liquid passes through the top sheet 8, which may come into contact with the wearer's skin, into the absorbent body 6, and is absorbed therein. The longitudinal direction of the diaper 1 is the same as the longitudinal directions of the absorbent body 6 and the top sheet 8.

[0016] The back sheet 5, absorbent body 6, and top sheet 8 all extend from the front body region 1F to the back body region 1R. Therefore, when the wearer's genitals are covered with the cover sheet 4, in which the back sheet 5, absorbent body 6, and top sheet 8 are laminated, the longitudinal ends of the back sheet 5, absorbent body 6, and top sheet 8 are located on the wearer's ventral and dorsal sides. In other words, the wearer's genitals are covered by the absorbent body 6 from the ventral to dorsal sides of the wearer. Therefore, whether the wearer is in a ventral or dorsal position when excreting fluid, the fluid excreted by the wearer comes into contact with the absorbent body 6 via the top sheet 8.

[0017] The diaper 1 also includes elastic members 4SL, 4SR for forming the leg gathers 3AL, 3AR described above, which are provided between the cover sheet 4 and the back sheet 5 so as to be stretchable in the longitudinal direction of the diaper 1. The number of elastic members 4SL, 4SR (two in this embodiment) is determined based on the elastic force (contractile force) required for the design of the diaper 1. The elastic members 4SL, 4SR may not be provided.

[0018] The diaper 1 also has a pair of water-impermeable side sheets 9L, 9R (an example of the "leak-proof sheet" as used herein) arranged on both skin-facing sides of the diaper 1 in the width direction and extending longitudinally. The side sheets 9L, 9R are arranged so that their longitudinal ends coincide with the longitudinal ends of the top sheet 8. Like the cover sheet 4, the side sheets 9L, 9R have constrictions 9KL, 9KR in the areas where the wearer's thighs are located. The side sheets 9L, 9R have fixing regions 9LA, 9RA (an example of the "bonding portion" as used herein) arranged on their outer width sides. The fixing regions 9LA, 9RA are bonded to the top sheet 8, which is the component arranged on the non-skin-facing side, with a hot-melt adhesive.

[0019] The side sheets 9L, 9R have rubber threads 9EL, 9ER (an example of the "elastic member" referred to in this application) arranged along their longitudinal direction to form the leakage barrier walls 3BL, 3BR. When the diaper 1 is worn, i.e., when the diaper 1 is U-shaped in side view, the contractile force of the rubber threads 9EL, 9ER draws the side sheets 9L, 9R longitudinally and causes them to rise from the top sheet 8, thereby forming the leakage barrier walls 3BL, 3BR that prevent the outflow of exuded liquid.

[0020] The side sheets 9L, 9R are bonded to the top sheet 8 with a hot melt adhesive. The widthwise inner edges of this hot melt adhesive form fold lines 3LL, 3LR (see FIG. 3), and the insides of the fold lines 3LL, 3LR form the upstanding leakage barrier walls 3BL, 3BR. That is, the fold lines 3LL, 3LR are the upstanding edges of the leakage barrier walls 3BL, 3BR. The widthwise inner edges of the side sheets 9L, 9R from the fold lines 3LL, 3LR are the leakage barrier walls 3BL, 3BR, and the widthwise inner edges of the side sheets 9L, 9R are the free edges 9LB, 9RB of the leakage barrier walls 3BL, 3BR. Two rubber threads 9EL, 9ER, which are thread-like elastic members, are arranged side by side in the width direction near the free edges 9LB, 9RB of the side sheets 9L, 9R. Note that only one rubber thread 9EL, 9ER may be arranged. The elastic threads 9EL, 9ER are fixed to the side sheets 9L, 9R with hot melt adhesive in a stretched state in the longitudinal direction of the diaper 1. The side sheets 9L, 9R have fixing portions 33L, 33R near their longitudinal ends. The fixing portions 33L, 33R fix the side sheets 9L, 9R to the top sheet 8, and serve as longitudinal starting points for the leakage barrier walls 3BL, 3BR when they rise. The side sheets 9L, 9R are also bonded to the top sheet 8 on their outer widthwise sides, but on the inner longitudinal sides of the fixing portions 33L, 33R, the inner widthwise sides of the fixing portions are not bonded with the hot melt adhesive, allowing them to rise toward the skin. When the elastic threads 9EL, 9ER contract and the leakage barrier walls 3BL, 3BR on the inner side of the fold lines 3LL, 3LR rise toward the skin, the free ends 9LB, 9RB become the tips on the skin-facing side. The upright leakage preventing walls 3BL, 3BR inhibit the movement of discharged liquid and loose stools outward in the width direction of the leakage preventing walls 3BL, 3BR, thereby suppressing lateral leakage of these.

[0021] FIG. 4 is a widthwise cross-sectional view of the diaper 1 taken along line AA in FIG. 3. The diaper 1 includes an absorbent body 6 that absorbs and retains excreted fluids such as urine. The absorbent body 6 is disposed on the non-skin-facing side of the top sheet 8, including the crotch region 1B, to absorb excreted fluids from the wearer. In this embodiment, the absorbent body 6 includes an absorbent core 6C (an example of the "absorbent mat" referred to in this application) and a core wrap sheet 7 (an example of the "first water-permeable sheet" referred to in this application) that covers part or all of the absorbent core 6C. The longitudinal direction of the absorbent body 6 coincides with the longitudinal direction of the absorbent core 6C, the longitudinal direction of the core wrap sheet 7, and the longitudinal direction of the diaper 1.

[0022] In plan view, the absorbent core 6C has a generally gourd-like shape, with the front and back body regions 1F and 1R being wider than the crotch region 1B and the crotch region 1B being narrowed. The crotch region 1B is sandwiched between the wearer's legs, so it is subjected to compressive pressure inward in the width direction. Meanwhile, the front and back body regions 1F and 1R are subjected to pressure in the thickness direction of the absorbent core 6C due to the wearer's weight. To accommodate these pressures, the absorbent core 6C is narrowed in the crotch region 1B. In the front and back body regions 1F and 1R, the width of the absorbent core 6C is increased to increase the area on which the weight is applied, thereby preventing deformation in the thickness direction. For this reason, it is preferable that the absorbent core 6C be generally gourd-shaped. The absorbent core 6C may also be generally rectangular.

[0023] The absorbent core 6C has a mat structure in which granular absorbent resin (polymeric water-absorbing material) such as SAP (Super Absorbent Polymer), a hydrophilic polymer with a cross-linked structure that can absorb and retain water, is held in the gaps between short fibers of cellulosic fibers such as pulp, rayon, or cotton, or short fibers made from synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate that have been hydrophilically treated. These short fibers and SAP are examples of absorbent materials.

[0024] The SAP particles of this embodiment refer to a granular resin composition containing SAP. The term "SAP-containing resin composition" as used herein includes both a composition consisting of SAP alone and a composition containing SAP as the main component and containing other substances to the extent that they do not adversely affect the water absorption. The concept of "other substances" includes additives (such as surface modifiers added to make the particle surface hydrophobic) and unreacted monomers remaining during the synthesis of SAP. SAP particles can absorb about 10 to 100 times their own weight in liquid. The SAP particles may be, for example, granular particles having a diameter of about 0.1 to 0.5 mm before absorbing liquid.

[0025] While SAP particles gel and can retain liquid, it takes a certain amount of time for the liquid to be absorbed. In diaper 1, the short fibers slow down the discharged liquid while diffusing it within the absorbent core 6C until the SAP particles have absorbed the liquid, allowing the discharged liquid to be absorbed by a wide range of SAP particles, thereby preventing the liquid from flowing back.

[0026] The absorbent core 6C may have three low-bulk portions (not shown) extending in the longitudinal direction of the absorbent core 6C and spaced apart in the width direction. The low-bulk portions are portions of the absorbent material composed of the above-mentioned short fibers and SAP particles that are less bulky than the surrounding absorbent material and are formed in a concave shape from the skin-facing side to the non-skin-facing side. Urine and other excreted fluids discharged by the wearer are dispersed throughout the absorbent core 6C along the low-bulk portions provided on the skin-facing side of the absorbent core 6C. This allows the diaper 1 to efficiently absorb urine and other excreted fluids discharged by the wearer throughout the entire absorbent core 6C.

[0027] The absorbent core 6C may have an upper-layer absorbent mat arranged on the top sheet 8 side and a lower-layer absorbent mat arranged on the side not facing the wearer's skin.

[0028] The core wrap sheet 7 is a water-permeable sheet that sandwiches the absorbent core 6C, and more specifically, it covers the skin-facing side, side, and non-skin-facing side of the absorbent core 6C. The core wrap sheet 7 maintains the shape of the absorbent core 6C when not in contact with excreted liquid, preventing it from losing its shape and preventing the SAP particles contained in the absorbent core 6C from escaping. Furthermore, SAP particles when not absorbing moisture are hard and sand-like, and if these SAP particles escape from the absorbent body 6 and come into direct contact with the wearer's skin, they may cause discomfort to the wearer. For this reason, the absorbent core 6C is sandwiched between the core wrap sheets 7 to prevent the absorbent core 6C from losing its shape and to prevent the SAP particles from escaping outside the absorbent body 6.

[0029] In this embodiment, the core wrap sheet 7 is made of a pulp fiber sheet or a thin nonwoven fabric. The core wrap sheet 7 is formed from two sheets: an upper core wrap sheet 7A that is placed between the absorbent core 6C and the top sheet 8, and a lower core wrap sheet 7B that is placed on the non-skin-facing side of the absorbent core 6C. The upper core wrap sheet 7A and the lower core wrap sheet 7B of the core wrap sheet 7 are made from the same material. However, the upper core wrap sheet 7A and the lower core wrap sheet 7B may also be made from different materials. As an example, the upper core wrap sheet 7A can be made of an air-through nonwoven fabric, and the lower core wrap sheet 7B can be made of tissue paper.

[0030] In this embodiment, the core wrap sheet 7 is arranged to cover the skin-facing side, side surfaces, and non-skin-facing side of the absorbent core 6C. As shown in Fig. 4, the lower core wrap sheet 7B is arranged on the non-skin-facing side of the absorbent core 6C, covers the side surfaces of the absorbent core 6C, and is further arranged to cover the widthwise outer sides of the upper core wrap sheet 7A. Here, the upper core wrap sheet 7A and the lower core wrap sheet 7B are laminated on both widthwise sides of the skin-facing side of the absorbent core 6C, forming a laminated section 7S.

[0031] The absorbent body 6 provided in the diaper 1 according to this embodiment has compressed portions (an example of the "compressed grooves" referred to in this application) formed by compressing the absorbent body 6 from the skin-facing side. Fig. 5 is a plan view of the diaper 1 showing the compressed portions 20. For the sake of explanation, some components are not shown. The compressed portions 20 in this embodiment are formed by grooves 20A and 20B that intersect with each other as shown in Fig. 5. It is composed of a plurality of grooves having

[0032] As shown in FIG. 5, the groove 20A extends linearly from the front left side to the rear right side of the diaper 1, and the groove 20B extends linearly from the front right side to the rear left side of the diaper 1. The grooves 20A and 20B have uniform depths and widths throughout their extension directions and are formed in a grid pattern diagonal to the long or short sides of the absorbent body 6. The extension directions of the grooves 20A and 20B are not limited to the example configuration shown in FIG. 5. For example, the groove 20A may extend from the front to the rear of the diaper 1, and the groove 20B may extend from the right to the left side of the diaper 1. The grooves 20A and 20B may also be formed in a grid pattern parallel to the long or short sides of the absorbent body 6.

[0033] Air flows along the grooves 20A and 20B provided on the skin-facing side of the absorbent body 6, thereby improving the breathability of the diaper 1. Liquid discharged by the wearer, such as urine, is dispersed throughout the absorbent body 6 along the grooves 20A and 20B provided on the skin-facing side of the absorbent body 6. This allows the diaper 1 to efficiently absorb liquid discharged by the wearer, such as urine, throughout the entire absorbent body 6. Furthermore, providing the grooves 20A and 20B in the absorbent body 6 makes it easier to bend, thereby improving the comfort of the diaper 1 when worn by the wearer.

[0034] FIG. 6 is an enlarged view of the compressed portion 20. Since the grooves 20A and 20B have the same configuration, they will be hereinafter referred to as the compressed portion 20. FIG. 6(A) is a cross-sectional view of the compressed portion 20 in the width direction at the center of the compressed portion 20 in the extension direction. FIG. 6(B) is a cross-sectional view of the compressed portion 20 in the width direction at the end of the compressed portion 20 in the extension direction. FIG. 6(C) is a cross-sectional view of the compressed portion 20 in the extension direction at the end of the compressed portion 20 in the extension direction. FIG. 6(D) is an enlarged view of the compressed portion 20 provided at the end of the compressed portion 20 in the extension direction in a plan view of the diaper 1.

[0035] The top sheet 8 placed on the skin-facing side of the absorbent body 6 is bonded to the core wrap sheet 7 on the non-skin-facing side of the top sheet 8 with an adhesive such as a hot melt adhesive while inserted into the compressed section 20 as shown in Figure 6(A). Therefore, the top sheet 8 has recesses 22 that are recessed on the non-skin-facing side along the compressed section 20. In this embodiment, the core wrap sheet 7 placed on the non-skin-facing side of the top sheet 8 is an upper-layer core wrap sheet 7A at the center in the extension direction of the compressed section 20, and a lower-layer core wrap sheet 7B at the end sides in the extension direction of the compressed section 20.

[0036] By providing the compressed portions 20 and the recesses 22, excreted liquid such as urine discharged by the wearer can be made to flow along the compressed portions 20 and the recesses 22 in the extension direction of the grooves 20A and 20B and dispersed throughout the absorbent body 6. The wider the area over which excreted liquid such as urine is absorbed, the more likely it is that excreted liquid such as urine is absorbed into the absorbent core 6C. Therefore, it is preferable to provide the compressed portions 20 and the recesses 22 over the entire absorbent core 6C. However, excreted liquid such as urine will reach the ends of the compressed portions 20 and the recesses 22 along the compressed portions 20 and the recesses 22. If the compressed portions 20 and the recesses 22 are located near the ends of the absorbent core 6C and are not arranged parallel to the ends of the absorbent core 6C, excreted liquid such as urine that reaches the compressed portions 20 and the recesses 22 may leak out of the absorbent body 6 without being absorbed by the absorbent core 6C.

[0037] The diaper 1 according to this embodiment has weakly bonded sections 21A that weakly bond the top sheet 8 and the core wrap sheet 7 together at the end sides of the compression sections 20 in the extension direction. Weak bonding refers to a state in which the bonded materials are bonded to such an extent that they can be peeled apart without tearing. When the weak bonding at some or all of the weakly bonded sections 21A is released, the top sheet 8 peels off from the lower core wrap sheet 7B at the end sides of the compression sections 20 in the extension direction, as shown in Figures 6(B) and 6(C). This causes the top sheet 8 to rise to the skin-facing side, and the recesses 22 at the end sides of the compression sections 20 in the extension direction are recessed to a shallower depth toward the non-skin-facing side than at the center of the compression sections 20 in the extension direction. At this time, the recesses 22 at the end sides of the compression sections 20 in the extension direction are The recesses on the non-skin facing side become shallower toward the end, making it difficult for excreted liquids such as urine to flow along the extending direction of the recesses 22.

[0038] Here, the top sheet 8 that has been peeled off from the lower core wrap sheet 7B due to the release of the weak adhesive at the weakly adhesive sections 21A becomes a top sheet 8 that does not have any recesses on the non-skin-facing side, and therefore forms fan-shaped pleats that extend from the part where the top sheet 8 is adhered to the lower core wrap sheet 7B toward the end of the compressed section 20. As a result, excreted liquid such as urine is spread and diffused along the top sheet 8 in the width direction of the compressed section 20, as shown in Figure 6(D). Therefore, excreted liquid such as urine that flows through the compressed sections 20 and the recesses 22 and reaches the end of the compressed section 20 in the extension direction is diffused along the top sheet 8 that spreads in the width direction of the compressed section 20 and is absorbed by the absorbent core 6C on both sides of the width direction of the compressed section 20. This prevents excreted liquid such as urine from flowing only in the direction along the extension direction of the compressed sections 20, and prevents excreted liquid such as urine from leaking from the absorbent core 6C at the end of the compressed section 20 in the extension direction.

[0039] Furthermore, when the weak adhesion of the weakly bonded sections 21A is released, the top sheet 8 peels away from the core wrap sheet 7 at the end sides of the compressed sections 20 in the extension direction, forming a space A between the top sheet 8 and the lower core wrap sheet 7B. When excreted liquid such as urine enters the space A formed between the top sheet 8 and the lower core wrap sheet 7B, it is easily absorbed by the absorbent core 6C provided on the non-skin-facing side of the lower core wrap sheet 7B via the lower core wrap sheet 7B. Therefore, excreted liquid such as urine flowing along the compressed sections 20 and recesses 22 is sequentially absorbed by the absorbent core 6C. Therefore, excreted liquid such as urine flows in the direction along the extension direction of the compressed sections 20, thereby preventing it from leaking from the absorbent core 6C at the end sides of the grooves 20A and 20B in the extension direction.

[0040] 6(A), it is preferable to have a strong adhesive portion 21K between the top sheet 8 and the upper core wrap sheet 7A at the center of the extension direction of the compressed portion 20, which has a stronger adhesive strength than the end sides of the extension direction of the compressed portion 20 and is strongly bonded to the extent that the bonded materials cannot be peeled apart without tearing them apart. At the center of the extension direction of the compressed portion 20, the top sheet 8 and the upper core wrap sheet 7A are strongly bonded by the strong adhesive portion 21K, which prevents the recesses 22 from becoming shallower on the non-skin facing side, and allows excreted liquids such as urine to flow along the compressed portion 20 and the recesses 22.

[0041] It is preferable that the top sheet 8 and the upper core wrap sheet 7A are intermittently bonded at the center of the extension direction of the compressed sections 20. Because the strong bond sections 21K bond the top sheet 8 and the upper core wrap sheet 7A, the top sheet 8 and the upper core wrap sheet 7A are in close contact with each other. Therefore, excreted liquids such as urine are easily absorbed into the absorbent body 6 via the top sheet 8. This allows most of the water from excreted liquids such as urine to be absorbed into the absorbent core 6C before they reach the ends of the extension direction of the compressed sections 20. However, if the top sheet 8 and the upper core wrap sheet 7A are bonded entirely, the rate at which excreted liquids such as urine flow into the absorbent core 6C via the top sheet 8 increases. Therefore, excreted liquids such as urine are absorbed and retained in the absorbent core 6C before being dispersed throughout the absorbent body 6. As a result, even if the compressed sections 20 extend over the entire absorbent core 6C, excreted liquids such as urine may not be dispersed throughout the absorbent body 6.

[0042] By intermittently bonding the top sheet 8 and the upper core wrap sheet 7A, the top sheet 8 separates from the upper core wrap sheet 7A in the areas where the top sheet 8 and the upper core wrap sheet 7A are not bonded to each other. Air enters the space where the top sheet 8 is separated from the upper core wrap sheet 7A, forming an air layer. The air layer prevents excreted liquids such as urine from flowing from the top sheet 8 to the upper core wrap sheet 7A side. Therefore, by intermittently bonding the top sheet 8 and the upper core wrap sheet 7A at the center in the extension direction of the compressed section 20, the inflow of excreted liquids such as urine from the top sheet 8 into the absorbent body 6 is promoted at the strong bonded section 21K, and the top sheet 8 and the upper core wrap sheet 7A are bonded to each other. In the uncompressed areas, the flow of excreted liquid such as urine from the top sheet 8 into the absorbent body 6 is inhibited. This allows excreted liquid such as urine to flow throughout the entire area in the extension direction of the compressed sections 20. Therefore, it is preferable that the top sheet 8 and the upper core wrap sheet 7A are intermittently bonded in the center of the extension direction of the compressed sections 20.

[0043] The absorbent core 6C and the upper core wrap sheet 7A are bonded together with an adhesive such as a hot melt adhesive. Here, the adhesive density between the absorbent core 6C and the upper core wrap sheet 7A is higher than the adhesive density of the strong adhesive portion 21K, so excreted liquids such as urine can easily flow in from any part of the upper core wrap sheet 7A facing the absorbent core 6C and are absorbed by the entire absorbent core 6C.

[0044] The weak adhesion of the weakly-adhesive portions 21A may be released by raising the leakage barrier walls 3BL, 3BR. Fig. 7 is a cross-sectional view showing the cross section of Fig. 4 in a state in which the leakage barrier walls 3BL, 3BR are raised. The arrows in Fig. 7 indicate the direction in which the top sheet 8 is pulled by the leakage barrier walls 3BL, 3BR. When the leakage barrier walls 3BL, 3BR are raised, the top sheet 8, which is adhered to the side sheets 9L, 9R that form the leakage barrier walls 3BL, 3BR, is pulled toward the skin side, thereby releasing the weak adhesion of the weakly-adhesive portions 21A. The weak adhesion of the weakly-adhesive portions 21A may be released before the wearer puts on the diaper 1.

[0045] As described above, the diaper 1 according to this embodiment has weakly bonded sections 21A between the top sheet 8 at the end sides of the compressed sections 20 in the extension direction and the core wrap sheet 7 arranged on the non-skin-facing side of the top sheet 8. By providing the weakly bonded sections 21A, the weak adhesion of the weakly bonded sections 21A is released, and the top sheet 8 rises from the lower core wrap sheet 7B and spreads out in a fan shape. This causes excreted liquid such as urine that reaches the ends of the compressed sections 20 located near the ends of the absorbent body 6 to be diffused in the width direction of the compressed sections 20, preventing excreted liquid such as urine from leaking from the absorbent body 6.

[0046] Furthermore, in this embodiment, the compressed portions 20 include a longitudinal center portion corresponding to the middle region of the absorber 6 when it is divided into thirds in the longitudinal direction of the absorber 6, and a widthwise center portion corresponding to the middle region of the absorber 6 when it is divided into thirds in the widthwise direction of the absorber 6, and extend in the width direction of the absorber 6. In other words, the grooves 20A and 20B correspond to the wearer's urethral opening and anus, and extend in the width direction of the absorber 6 from the longitudinal center portion and widthwise center portion of the absorber 6, into which a large amount of excreted fluid such as urine flows, and the ends of the grooves 20A and 20B extend in a direction intersecting with the widthwise ends of the absorber 6.

[0047] The width direction of the absorbent body 6 is shorter than the length in the longitudinal direction, and excreted liquid such as urine extending in the width direction of the absorbent body 6 reaches the width direction ends earlier than the longitudinal direction ends. Therefore, the amount of excreted liquid such as urine absorbed by the absorbent core 6C while passing through the compressed sections 20 extending in the width direction of the absorbent body 6 is also less than when the compressed sections 20 extend in the longitudinal direction. Therefore, when the compressed sections 20 have the above-mentioned configuration, excreted liquid such as urine is likely to overflow the ends of the compressed sections 20 and leak out of the absorbent body 6. Furthermore, when the ends of the compressed sections 20 extend in a direction intersecting the width direction ends of the absorbent body 6, excreted liquid such as urine that reaches the ends of the grooves 20A and 20B may leak out of the absorbent body 6 without being absorbed by the absorbent core 6C.

[0048] The diaper 1 of this embodiment has a weak adhesive portion 21A on the end side of the extension direction of the compressed portion 20, and the top sheet 8 floats up from the lower core wrap sheet 7B and spreads in the width direction of the compressed portion 20, thereby diffusing excreted liquids such as urine in the width direction of the compressed portion 20 and preventing them from leaking out of the absorbent body 6.

[0049] In this embodiment, the laminated portion 7S is preferably disposed closer to the end of the compression portion 20 than to the center of the compression portion 20 in the extending direction. Therefore, the shape of the compressed portion 20 is less likely to be formed by compression compared to an area where a single core wrap sheet 7 is arranged. Therefore, by providing the laminated portion 7S on the end side of the compressed portion 20 in the extension direction, the depth to which the recess 22 is recessed on the non-skin facing side tends to be shallower.

[0050] Furthermore, the diaper 1 according to this embodiment may have a non-adhesive section 21H at the end of the extension direction of the compressed section 20 between at least one water-permeable sheet between the upper-layer core wrap sheet 7A and the top sheet 8, where adjacent water-permeable sheets in the thickness direction are not adhered to each other. FIG. 8 is a plan view showing the non-adhesive section 21H. Note that for the sake of explanation, some components are omitted. The non-adhesive section 21H extends in the longitudinal direction of the diaper 1 as shown in FIG. 8. By providing the non-adhesive section 21H between the core wrap sheet 7 and the top sheet 8, a space A shown in FIG. 6 is formed between the core wrap sheet 7 and the top sheet 8, and the depth of the recess 22 on the non-skin-facing side is reduced. Furthermore, when the space A is formed between the core wrap sheet 7 and the top sheet 8, excreted liquid such as urine penetrates into the space A formed between the top sheet 8 and the lower-layer core wrap sheet 7B and is easily absorbed by the absorbent core 6C provided on the non-skin-facing side of the lower-layer core wrap sheet 7B via the lower-layer core wrap sheet 7B.

[0051] It is also possible to layer a sheet such as a second sheet between the top sheet 8 and the absorbent body 6. By layering more sheets on the skin-facing side of the absorbent core 6C, it is possible to further prevent the absorbent material from leaking out of the top sheet 8.

[0052] Furthermore, during the production of the diaper 1, the end sides of the compressed portions 20 may be shallowly compressed. This makes the depressions of the recesses 22 on the end sides of the compressed portions 20 shallower, allowing excreted liquids such as urine to be dispersed in the width direction of the compressed portions 20.

[0053] <Other embodiments> The present invention is applicable not only to tape-type diapers but also to pants-type diapers and absorbent pads.

[0054] The features included in each of the embodiments and modifications thereof disclosed above can be combined with each other. [Explanation of symbols]

[0055] 1. Diapers 1F: Front body area 1B...Inseam area 1R: Back area 2F Front patch 2L, 2R Tape 3LL, 3LR... Folded line 3BL,3BR··Leakage prevention wall 33L,33R・Fixed part 4. Cover sheet 4SL, 4SR, 9EL, 9ER... Elastic thread 5. Back seat 6. Absorber 6C··Absorbent Core 7. Core wrap sheet 7A··Upper layer core wrap sheet 7B··Lower layer core wrap sheet 7S...Laminated section 8. Top sheet 9L, 9R side seats 9LA,9RA·Fixed area 9LB,9RB··Free end 20. Compression section 20A,20B·Groove 21A...Weak adhesive part 21K...strong adhesive part 21H...Non-adhesive part 22. Recess A Space

Claims

1. a length along a longitudinal direction corresponding to the front-to-back direction of the wearer; a length along a width direction perpendicular to the longitudinal direction; an absorbent body having an absorbent mat and a first water-permeable sheet arranged on the wearer's skin side of the absorbent mat; A compressed groove provided on the skin side of the absorbent body; A second water-permeable sheet that is adhered to the skin side of the first water-permeable sheet and has a shape that follows the compressed grooves; a weak adhesive portion where the adhesive strength between the first water-permeable sheet and the second water-permeable sheet is weaker on the end side of the compressed groove than on the central side of the compressed groove; Absorbent articles.

2. The compression grooves have a uniform depth and width. The absorbent article of claim 1.

3. The compressed groove includes the widthwise central portion of the longitudinal central portion of the absorbent body and extends in the width direction. The absorbent article according to claim 1 or 2.

4. A plurality of the first water-permeable sheets are arranged on the skin-facing side of the absorbent mat, and the number of the first water-permeable sheets arranged on the end side of the compressed groove is greater than the number of the first water-permeable sheets arranged on the center side of the compressed groove. The absorbent article according to claim 1 or 2.

5. A non-adhesive portion is provided between the first water-permeable sheet and the second water-permeable sheet stacked on the end side of the compression groove, in which adjacent water-permeable sheets in the thickness direction are not adhered to each other. The absorbent article according to claim 1 or 2.

6. a pair of water-impermeable leak-proof sheets extending in the longitudinal direction on both sides of the second water-permeable sheet in the width direction; The leak-proof sheet is a joining portion at which one end of the outer side in the width direction is joined to the second water-permeable sheet; a free end portion that can stand up on the skin surface side at one end on the inner side in the width direction; an elastic member bonded to the free end portion so as to extend in a stretched state in the longitudinal direction; and a fixing portion connected to the second water-permeable sheet at the longitudinal end portion. The absorbent article according to claim 1 or 2.

7. The first water-permeable sheet and the second water-permeable sheet are intermittently bonded to each other at the center of the compression groove. The absorbent article according to claim 1 or 2.

Images