Absorbent articles

Abstract

To provide an absorbent article that prevents a mildly acidic property from being deteriorated by a liquid excreted from a wearer, when the mildly acidic property is imparted to a sheet abutting on the wearer's skin.SOLUTION: An absorbent article has a length along a longitudinal direction, and a breadth along a width direction orthogonal to the longitudinal direction. The absorbent article comprises an absorber, and a liquid-permeable sheet which is arranged on the side of a wearer with respect to the absorber, which abuts on the wearer's skin and which contains a pH adjustment component. The absorber has a through-hole that penetrates in the thickness direction of the absorber.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to absorbent articles. [Background technology]

[0002] Some absorbent articles such as disposable diapers, urine pads, and sanitary products have a sheet that comes into contact with the wearer's skin that is given weak acidity (see, for example, Patent Document 1). As a result, when the wearer urinates, the pH-adjusting component in the sheet can neutralize alkaline components such as ammonia contained in the urine. This makes it possible to maintain the wearer's skin at a weak acidity to neutrality, and to prevent skin troubles from occurring. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-97660 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the sheet that comes into contact with the wearer's skin is wet with liquid excreted by the wearer, such as urine, the sheet may become covered in the liquid and not exhibit its weak acidic properties.

[0005] In one aspect, the present disclosure has been made in consideration of such circumstances, and its purpose is to provide an absorbent article that, when a weakly acidic property is imparted to a sheet that comes into contact with the wearer's skin, prevents said property from being impaired by liquid excreted by the wearer. [Means for solving the problem]

[0006] In order to solve the above problems, in the present invention, the absorbent body has through-holes that penetrate the absorbent body in the thickness direction.

[0007] In detail, the present invention relates to an absorbent article having a length along a longitudinal direction and a width along a width direction perpendicular to the longitudinal direction, the article comprising an absorbent body, and a liquid-permeable sheet containing a pH adjusting component, the liquid-permeable sheet being positioned closer to the wearer than the absorbent body and coming into contact with the wearer's skin, the absorbent body having through holes penetrating through the thickness of the absorbent body.

[0008] In the absorbent article, the through-hole may be provided in at least one of the urethral opening corresponding region and the periphery of the urethral opening corresponding region.

[0009] In the absorbent article, the absorbent body may have a pair of grooves extending in the longitudinal direction.

[0010] The absorbent article may further comprise a first stretchable portion having a first stretchable member arranged in a stretched state on the outer side in the width direction of the ventral end of the pair of grooves, and stretching in the width direction.

[0011] In the absorbent article, the pair of grooves may be disposed on the crotch side of the urethral opening corresponding area.

[0012] In this case, when the absorbent article is folded in half with the longitudinal ends overlapping each other, the length from the longitudinal center to the abdominal ends of the pair of grooves is within a range of 90 mm to 100 mm. , and may be for infants and toddlers weighing in the range of 5 kg to 13 kg.

[0013] In addition, the absorbent article may be for use with infants weighing 8 kg or more and 15 kg or less, in which the length from the longitudinal center to the ventral ends of the pair of grooves is within the range of 85 mm or more and 95 mm or less when the absorbent article is folded in half with the longitudinal ends overlapping each other.

[0014] In addition, the absorbent article may be for use with infants and young children weighing in the range of 11 kg to 23 kg, and in which the length from the longitudinal center to the ventral ends of the pair of grooves is in the range of 110 mm to 120 mm when the absorbent article is folded in half with the longitudinal ends overlapping each other.

[0015] In addition, the absorbent article may be for use with infants and young children weighing in the range of 12 kg to 29 kg, and in which the length from the longitudinal center to the ventral ends of the pair of grooves is in the range of 100 mm to 110 mm when the absorbent article is folded in half with the longitudinal ends overlapping each other.

[0016] In the absorbent article, the distance between the center lines of the pair of grooves may be 20 mm or more and 50 mm or less.

[0017] In the absorbent article, the pair of grooves may be through holes.

[0018] In addition, in the above-mentioned absorbent article, the pair of grooves may be at least one of a concave groove provided on the surface of the absorbent body that faces the wearer's skin and is recessed on the side opposite the skin side, and a concave groove provided on the surface of the absorbent body that faces the wearer's skin and is recessed on the side opposite the skin side. Effect of the Invention

[0019] According to the present invention, when a sheet that comes into contact with the wearer's skin is imparted with weak acidity, the sheet can be prevented from losing the weak acidity due to liquid excreted by the wearer. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a perspective view of a pants-type disposable diaper according to an embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the diaper according to the embodiment. [Diagram 3] FIG. 3 is a schematic diagram showing the diaper according to the first embodiment in an unfolded and stretched state. [Figure 4] FIG. 4 is a diagram illustrating the flow of urine excreted by a wearer in the diaper according to the first embodiment. [Diagram 5] FIG. 5 is a longitudinal cross-sectional view of the absorbent body when only the absorbent body is extracted from the diaper according to the first modification of the first embodiment and cut at a cross section including the groove. [Figure 6] FIG. 6 is a schematic diagram showing a diaper according to the second modification of the first embodiment in an unfolded and stretched state. [Figure 7] FIG. 7 is a schematic diagram showing the diaper according to the second embodiment in an unfolded and stretched state. [Figure 8] FIG. 8 is a diagram illustrating the flow of urine excreted by a wearer in a diaper according to the second embodiment. [Figure 9] FIG. 9 is a schematic diagram showing a diaper according to the first modification of the second embodiment in an unfolded and stretched state. [Figure 10] FIG. 10 is a plan view of the absorbent body extracted from the diaper according to the second modification of the second embodiment, viewed from the non-skin facing side. [Figure 11] FIG. 11 is a diagram illustrating the flow of urine excreted by a wearer in a diaper according to the second modification of the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes an embodiment of the present invention. The embodiment described below is an example of the present invention, and the technical scope of the present invention is not limited to the following aspect.

[0022] <First embodiment> Fig. 1 is a perspective view of a pants-type disposable diaper (hereinafter simply referred to as "diaper") according to an embodiment. Terms relating to directions used in this application refer to directions that correspond to the front, back, left and right of a wearer when the diaper 1 is worn by the wearer (hereinafter abbreviated as "worn state"). For example, the left-right direction in this application refers to the direction that corresponds to the left and right of a wearer when the diaper 1 is worn.

[0023] In this embodiment, as an example of an absorbent article, a pants-type disposable diaper having a tubular structure having an opening for receiving the wearer's abdominal circumference and a pair of left and right openings for inserting the wearer's left and right lower limbs is illustrated, but the "absorbent article" in this application is not limited to pants-type disposable diapers. The "absorbent article" in this application includes various types of absorbent articles that can cover the abdominal circumference and crotch area, such as a tape-type disposable diaper in which a tubular structure is formed by attaching a tape fixed near one end of a sheet-like member that covers the wearer's crotch area (genital area) from the front body to the back body to the other end of the sheet-like member.

[0024] In addition, the direction connecting the front body to the back body of the diaper 1 when worn is defined as the longitudinal direction. In addition, when the diaper 1 is worn, the side facing the wearer's skin (the inner side when worn) is defined as the skin-facing side, and the side opposite the skin-facing side (the outer side when worn) is defined as the non-skin-facing side. Furthermore, the direction connecting the skin-facing side and the non-skin-facing side is defined as the thickness direction, and the direction perpendicular to both the longitudinal direction and the thickness direction is defined as the width direction. Additionally, the view from the thickness direction is defined as a planar view.

[0025] The diaper 1 has a crotch region 1B, which is a region corresponding to the crotch region covering the crotch part (pubic area) of the wearer when worn, a front body region 1F, which is a region corresponding to the front body in the wearer's waist and covers the wearer's abdominal side, and a rear body region 1R, which is a region corresponding to the rear body in the wearer's waist and covers the wearer's back side. Here, the front body region 1F is located in front of the crotch region 1B, and the rear body region 1R is located in the rear of the crotch region 1B. Since the diaper 1 according to this embodiment is a pants-type disposable diaper, the left edge of the front body region 1F and the left edge of the rear body region 1R are joined to each other, and the right edge of the front body region 1F and the right edge of the rear body region 1R are joined to each other. Thus, in the diaper 1, a waist opening 2T is formed by the upper edge of the front body region 1F and the upper edge of the rear body region 1R. The diaper 1 has a left leg opening 2L formed in the left side of the crotch region 1B where the above-mentioned joining is not performed, and a right leg opening 2R formed in the right side of the crotch region 1B. When the diaper 1 is put on such that the wearer's left leg is inserted through the left leg opening 2L, the wearer's right leg is inserted through the right leg opening 2R, and the wearer's torso is inserted into the torso opening 2T, the front body region 1F is disposed on the wearer's abdomen side, the rear body region 1R is disposed on the wearer's back side, and the left leg opening 2L and the right leg opening 2R are fixed to the wearer's body in a state where they surround the wearer's thighs. Since the diaper 1 is fixed to the wearer's body in this manner, the wearer can stand and walk while wearing the diaper 1.

[0026] In the diaper 1, an absorbent capable of absorbing and retaining liquid is mainly disposed near the crotch region 1B. In addition, in order to prevent the formation of gaps between the diaper 1 and the wearer's skin that could serve as a path for liquid to flow out, the diaper 1 is provided with three-dimensional gathers 3BL at the left lower leg opening 2L surrounding the thigh of the left lower leg of the wearer, three-dimensional gathers 3BR at the right lower leg opening 2R surrounding the thigh of the right lower leg of the wearer, and waist gathers 3R at a portion surrounding the wearer's abdominal circumference. In addition, tummy gathers 3T (an example of the "first stretchable portion" as referred to in this application) are formed on the crotch region 1B side of the waist gathers 3R. The three-dimensional gathers 3BL, 3BR, waist gathers 3R and tummy gathers are adapted to stretch the wearer's body by the elastic force of the elastic members. It adheres closely to the skin. Therefore, excretory fluid discharged from the wearer's genitals is absorbed into the absorbent body of the diaper 1 with almost no leakage from the diaper 1. As the elastic member, a thread-like or strip-like rubber may be appropriately selected, and in this embodiment, a thread-like rubber is used.

[0027] Fig. 2 is an exploded perspective view of the diaper 1 according to the embodiment. Fig. 3 is a schematic diagram showing the diaper 1 according to the first embodiment in an unfolded and stretched state. Fig. 3(A) shows a schematic diagram of the internal structure of the diaper 1 in an unfolded and stretched state as viewed from the left side. Fig. 3(B) shows a schematic plan view of the diaper 1 in an unfolded and stretched state.

[0028] The diaper 1 has cover sheets 4F, 4R and a pad cover sheet 6 which form the outer surface when worn. The cover sheet 4F mainly forms the outer surface of the front body region 1F of the diaper 1. The pad cover sheet 6 mainly forms the outer surface of the crotch region 1B of the diaper 1. The cover sheet 4R mainly forms the outer surface of the rear body region 1R of the diaper 1. The cover sheets 4F, 4R and the pad cover sheet 6 are provided to reinforce the outer surface of the diaper 1 and to improve the touch. For example, in order to suppress leakage of excrement, a nonwoven fabric made of a liquid-impermeable thermoplastic resin can be used as the material thereof. Examples of the liquid-impermeable thermoplastic resin include polyethylene (PE) and polypropylene (PP). The liquid-impermeable sheet may have a large number of fine holes of about 0.1 to several μm formed therein so as to exhibit liquid impermeability and moisture permeability. The cover sheets 4F, 4R may have a plurality of holes formed in a part or all of the cover sheets 4F, 4R in order to improve the breathability around the waist.

[0029] The diaper 1 also has an inner coversheet 5F laminated on the skin-facing side of the coversheet 4F, and an inner coversheet 5R laminated on the skin-facing side of the coversheet 4F. The inner coversheet 5F is a sheet-like member having a shape that matches the portion of the coversheet 4F that is closer to the crotch region 1B than the perforation 4F6, which will be described later. The inner coversheet 5R, like the inner coversheet 5F, is also a sheet-like member having a shape that matches the portion of the inner coversheet 5R that is closer to the crotch region 1B than the perforation 4R6, which will be described later.

[0030] The diaper 1 also has a back sheet 7, an absorbent 8, and a top sheet 9, which are laminated in this order on the skin-facing side of the pad cover sheet 6. The pad cover sheet 6 is a substantially rectangular sheet having a length in the longitudinal direction that extends from the front body of the wearer to the back body via the crotch area, and a predetermined width in the width direction perpendicular to the longitudinal direction. The back sheet 7, the absorbent 8, and the top sheet 9 are all sheet-like members having a substantially rectangular appearance like the pad cover sheet 6, and are laminated in this order on the pad cover sheet 6 with their longitudinal directions coinciding with the longitudinal direction of the pad cover sheet 6. The longitudinal directions of the pad cover sheet 6, the back sheet 7, the absorbent 8, and the top sheet 9 coincide with the longitudinal direction of the diaper 1, and the width directions of the pad cover sheet 6, the back sheet 7, the absorbent 8, and the top sheet 9 coincide with the width direction of the diaper 1.

[0031] The back sheet 7 is a sheet made of a liquid-impermeable thermoplastic resin to prevent leakage of excrement. The top sheet 9 is a sheet-like member arranged on the wearer's skin side so as to cover the water-absorbing surface of the absorbent body 8. The top sheet 9 is liquid-permeable in part or in whole. Therefore, when the diaper 1 is worn, liquid excreted from the wearer passes through the top sheet 9 that may come into contact with the wearer's skin and penetrates into the absorbent body 8, where it is absorbed. Examples of liquid-permeable sheets include woven fabrics, nonwoven fabrics, and porous films. The top sheet 9 may also be hydrophilic.

[0032] The top sheet 9 contains a pH adjusting component and has weak acidic properties. The pH adjusting component may be, for example, an organic acid, which is highly safe and substantially odorless before the diaper 1 is used. Malic acid or citric acid is used. The top sheet 9 is made by applying a chemical solution containing an organic acid to a neutral sheet.

[0033] The absorbent body 8 has a structure in which granular absorbent resin such as hydrophilic superabsorbent polymer having a cross-linked structure capable of absorbing and retaining water is held in gaps between short fibers of cellulosic fibers such as pulp fibers, rayon fibers, or cotton fibers, or between short fibers obtained by hydrophilizing synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate. Thus, when the absorbent body 8 absorbs liquid excreted from the wearer, the absorbent resin held in the gaps in the short fibers swells to hold the liquid in the short fibers. The absorbent body 8 may have a single-layer structure consisting of one mat, or a laminated structure in which multiple mats are stacked. The absorbent body 8 may have an appropriate shape according to the purpose. Examples of the shape of the absorbent body 8 include a rectangular shape, an hourglass shape with a narrowed center, and various other shapes.

[0034] The back sheet 7, absorbent body 8, and top sheet 9 all extend from the front body region 1F to the rear body region 1R. Therefore, when the wearer's private parts (crotch area) are covered with the pad cover sheet 6 on which the back sheet 7, absorbent body 8, and top sheet 9 are laminated, both ends in the longitudinal direction of the back sheet 7, absorbent body 8, and top sheet 9 are located on the wearer's ventral side and back side. In other words, the wearer's private parts are covered by the absorbent body 8 from the wearer's ventral side to the back side. Therefore, whether the wearer is in a ventral or back-down position when excreting liquid, the excreted liquid comes into contact with the absorbent body 8 via the top sheet 9.

[0035] The diaper 1 also has long, strip-like side sheets 10L, 10R for forming the above-mentioned three-dimensional gathers 3BL, 3BR. The side sheets 10L, 10R are provided on the longer sides of the top sheet 9. Rubber threads 10L1, 10R1 are adhered to the side sheets 10L, 10R in the longitudinal direction. Thus, in the side sheets 10L, 10R, an edge 4F7 of the cover sheet 4F forming the left edge of the front body region 1F is joined to an edge 4R7 of the cover sheet 4R forming the left edge of the back body region 1R, and an edge 4F8 of the cover sheet 4F forming the right edge of the front body region 1F is joined to an edge 4R8 of the cover sheet 4R forming the right edge of the back body region 1R, so that when the diaper 1 is completed as shown in Fig. 1, the side sheets 10L, 10R are pulled in the longitudinal direction by the contractile force of the elastic threads 10L1, 10R1 and rise from the top sheet 9 along the fold-back lines 10L2, 10R2, forming three-dimensional gathers 3BL, 3BR that prevent liquid from leaking out from the left lower leg opening 2L and the right lower leg opening 2R. The method for joining edge 4F7 of cover sheet 4F and edge 4R7 of cover sheet 4R, and edge 4F8 of cover sheet 4F and edge 4R8 of cover sheet 4R is not particularly limited, but may be, for example, heat sealing, high-frequency sealing, ultrasonic sealing, or the like.

[0036] The diaper 1 also has an air passage forming sheet 11F laminated on the skin-facing side of the cover sheet 4F, sandwiching the pad cover sheet 6, the back sheet 7, the absorbent 8, the top sheet 9, and the side sheets 10L and 10R, and an air passage forming sheet 11R laminated on the skin-facing side of the cover sheet 4R. The air passage forming sheet 11F is laminated on the cover sheet 4F at one end side in the longitudinal direction of the top sheet 9. The air passage forming sheet 11R is laminated on the cover sheet 4R at the other end side in the longitudinal direction of the top sheet 9. In the present application, the state in which the sheets are overlapped is not limited to a state in which the overlapped sheets are in full contact with each other, but is a concept including a state in which parts of the sheets are overlapped. For example, the air passage forming sheet 11F is laminated in a state in which a part of one end side in the longitudinal direction of the pad cover sheet 6 touches a part of the cover sheet 4F.

[0037] The air passage forming sheet 11F has an area extending in the left-right direction along the upper edge of the front body region 1F. A large number of minute ventilation holes 11F1 for ventilation are arranged in the air passage forming sheet 11R, similarly to the air passage forming sheet 11F, a large number of ventilation holes 11R1 are arranged in the air passage forming sheet 11R. Here, the ventilation hole means an opening that communicates the space on one side of the sheet with the space on the other side, and the shape is not particularly limited. Therefore, for example, openings having a circular, elliptical, polygonal (triangle, square, etc.) shape can be applied as the ventilation hole 11F1, 11R1. The formation of the ventilation hole 11F1, 11R1 in the air passage forming sheet 11F, 11R does not mean that the air passage forming sheet 11F, 11R is made of a material that has no air permeability, and the air passage forming sheet 11F, 11R may be made of a material that has air permeability or a material that does not have air permeability. The air passage forming sheet 11F, 11R is preferably made of a material that has air permeability and liquid permeability, but may be made of a material that has no air permeability, for example. The size and number of the ventilation holes 11F1 and 11R1 are not particularly limited. For example, the opening area is 0.5 to 10 mm 2 It is preferable that about 5 to 200 holes are formed.

[0038] As described above, the diaper 1 is formed by stacking the cover sheets 4F, 4R, the air passage forming sheets 11F, 11R, the pad cover sheet 6, and the side sheets 10L, 10R, in addition to the back sheet 7 and top sheet 9 sandwiching the absorbent body 8 therebetween, and can be said to have a laminate formed by stacking these multiple sheets.

[0039] Here, as shown in FIG. 3, one end of the cover sheet 4F is folded back at the perforation 4F6. The perforation 4F6 is a dotted line of air vents formed by small linear slits in the cover sheet 4F along the edge of the waist opening 2T. The dotted air vents forming the perforation 4F6 are large enough that the wearer's fingers cannot enter. For example, an air vent formed by a slit having a length of 5 mm or less cannot accommodate the fingers of an average infant. The perforation 4F6 has a predetermined interval between the slits forming the dotted air vents so that the cover sheet 4F is not torn at the perforation 4F6 when the diaper 1 is in normal use. Although it depends on the strength of the material constituting the cover sheet 4F, a basis weight of 8 to 50 g / m2 that does not impair the elasticity and wearing comfort required for the waist circumference is 8 to 50 g / m2. 2 For sheets of this size, the distance between cuts is preferably 2 mm or more.

[0040] The waist gather 3R is formed by adhering the rubber threads 4F2 and 4F3 to the cover sheet 4F in a stretched state, and adhering the rubber threads 4R2 and 4R3 to the cover sheet 4R in a stretched state. The rubber threads 4F2 and 4F3 adhered to the cover sheet 4F are provided along the perforation 4F6 that will form the upper edge of the front body region 1F when folded back, in the order of the rubber thread 4F2 and the rubber thread 4F3, from the perforation 4F6 side. Similarly to the rubber threads 4F2 and 4F3, the rubber threads 4R2 and 4R3 adhered to the cover sheet 4R are also provided along the perforation 4R6 that will form the upper edge of the back body region 1R when folded back, in the order of the rubber thread 4R2 and the rubber thread 4R3, from the perforation 4R6 side. Therefore, the rubber threads 4F2 and 4F3 are provided on the cover sheet 4F in such a way that the waist circumference direction, which is the stretch direction, is the width direction (left-right direction) of the diaper 1. The rubber threads 4R2, 4R3 are provided on the cover sheet 4R so that the longitudinal direction, which is the stretch direction, is the width direction (left-right direction) of the diaper 1. Thus, when the edge 4F7 and the edge 4R7 (see FIG. 2) are joined together and the edge 4F8 and the edge 4R8 (see FIG. 2) are joined together, the rubber threads 4F2, 4F3 and the rubber threads 4R2, 4R3 form a substantially annular stretchable member that goes around the waist opening 2T, and exerts the function of contracting the waist opening 2T in the waist circumference direction. That is, the rubber threads 4F2, 4F3 and the rubber threads 4R2, 4R3 exert a contraction force to bring the diaper 1 into close contact with the wearer and prevent the formation of a gap between the diaper 1 and the wearer's abdominal circumference. The rubber threads 4F2, 4F3 and the rubber threads 4R2, 4R3 are discretely bonded to the cover sheets 4F, 4R by adhesive that is discretely applied in the longitudinal direction of the rubber threads. The adhesive for joining the rubber threads 4F2, 4F3, 4R2, 4R3 to the cover sheets 4F, 4R is The rubber threads 4F2, 4F3, 4R2, and 4R3 may be applied to the cover sheets 4F and 4R, or may be applied to the cover sheets 4F and 4R. The rubber threads 4F2, 4F3, 4R2, and 4R3 may be joined to the cover sheets 4F and 4R by ultrasonic welding instead of by adhesive. Since the length of the rubber threads 4F2, 4F3, 4R2, and 4R3 is such that the wearer's fingers do not pass through the slits of the perforation 4F6, the rubber threads will not be cut by the fingertips touching the rubber threads 4F2, 4F3, etc.

[0041] Furthermore, rubber threads 4F4, 4F5 (an example of the "first elastic member" in the present application) are attached in a stretched state to the cover sheet 4F, and rubber threads 4R4, 4R5 are attached in a stretched state to the cover sheet 4R. The rubber threads 4F4, 4F5 are elastic members provided in a region of the cover sheet 4F closer to the crotch region 1B than the rubber thread 4F3. In the diaper 1, the rubber threads 4F4, 4F5, 4R4, 4R5 form a tummy gather 3T closer to the crotch region 1B than the waist gather 3R. However, unlike the rubber threads 4F2, 4F3 that extend from the left end to the right end of the cover sheet 4F, the rubber threads 4F4, 4F5 have their widthwise center portions cut by a predetermined width. The cover sheet 4F has the rubber threads 4F4, 4F5 whose widthwise center portions are cut, and thus provides an appropriate fit to the lower abdomen of the wearer without inhibiting the expansion of the absorbent body 8 due to water absorption. The cover sheet 4R is similar to the cover sheet 4F, and rubber threads 4R4, 4R5, the widthwise center of which is cut to a specified width, are adhered to the cover sheet 4R to provide an appropriate fit around the wearer's lower abdomen.

[0042] As shown in Fig. 3, the absorbent body 8 has a pair of grooves 8SL, 8SR extending in the longitudinal direction of the diaper 1. The pair of grooves 8SL, 8SR penetrate the absorbent body 8 in the thickness direction and extend centered around the crotch region 1B. The grooves 8SL, 8SR have the same length and width and are disposed at the same position in the longitudinal direction of the diaper 1. The grooves 8SL, 8SR are disposed symmetrically with respect to the center of the width of the diaper 1 and are formed parallel to each other. Urine excreted by the wearer is introduced into the pair of grooves 8SL, 8SR and dispersed throughout the absorbent body 8.

[0043] The elastic threads 4F4, 4F5 are arranged in a stretched state on the outer side of the width direction of the diaper 1 at the end (abdominal end) of the pair of grooves 8SL, 8SR on the front body region 1F side. The diaper 1 according to this embodiment is suitable for male and female infants. The region 40 illustrated by an elliptical dotted line in FIG. 3 is a urethral opening corresponding region (hereinafter referred to as the "urethral opening corresponding region 40") corresponding to the urethral opening of the wearer. The urethral opening corresponding region 40 is a region that overlaps in the thickness direction with the position where the wearer's urethral opening abuts against the top sheet 9 when the diaper 1 is normally worn. The urethral opening corresponding region 40 is arranged on the front body region 1F side of the diaper 1, and the pair of grooves 8SL, 8SR are arranged on the crotch region 1B side of the urethral opening corresponding region 40. The urethral opening corresponding region 40 is adjacent to the abdominal side of the diaper 1. Here, the abdominal side portion is the front body region 1F side of the waist gathers 3R, and is the region where the elastic threads 4F2, 4F3 are arranged. In other words, the urethral opening corresponding region 40 is adjacent to the waist gathers 3R on the front body region 1F side.

[0044] When the diaper 1 is worn, the outer side of the pair of grooves 8SL, 8SR in the width direction is pressed toward the skin surface by the rubber thread 4F5, while the area between the pair of grooves 8SL, 8SR is not pressed toward the skin surface, forming a space between the top sheet 9 and the skin surface. This is because the force of the rubber thread 4F5 pulling the diaper 1 outward in the width direction is hindered by the grooves 8SL, 8SR between the pair of grooves 8SL, 8SR, and the area is more likely to separate from the skin surface than the outer side of the pair of grooves 8SL, 8SR in the width direction. When worn, the diaper 1 can temporarily store urine discharged into the urethral opening corresponding region 40 in this space. The diaper 1 can gradually guide the urine stored in the space to the grooves 8SL, 8SR, and can spread the urine along the grooves 8SL, 8SR to the entire absorbent body 8. As a result, the diaper 1 according to this embodiment can suppress lateral leakage, in which urine leaks from the side, and abdominal leakage, in which urine leaks from the abdominal side, thereby suppressing urine leakage.

[0045] In FIG. 3, the dashed line CL is the center line of the groove 8SL, the dashed line CR is the center line of the groove 8SR, and the distance between the center lines of the grooves 8SL and 8SR is W. The distance W is set to 20 mm or more and 50 mm or less so that a space for storing urine is formed when the diaper is worn, taking into consideration the size of the baby's body. This forms a space for storing urine suitable for the baby. In addition, since the grooves 8SL and 8SR are provided on the crotch region 1B side of the urethral opening corresponding region 40, the grooves 8SL and 8SR are unlikely to come into contact with the urethral opening even through the top sheet 9. This prevents the grooves 8SL and 8SR from irritating the urethral opening, and prevents skin troubles around the urethral opening.

[0046] Preferably, the end of the pair of grooves 8SL, 8SR on the front body region 1F side is closer to the crotch region 1B than the urethral opening corresponding region 40, and the end of the pair of grooves 8SL, 8SR on the back body region 1R side is closer to the crotch region 1B than the anus corresponding region 30 corresponding to the wearer's anus shown in Fig. 3. The anus corresponding region 30 is a region that overlaps in the thickness direction with the position where the wearer's anus abuts against the top sheet 9 when the diaper 1 is normally worn. The grooves 8SL, 8SR in the diaper 1 prevent irritation to the urethral opening and anus, and can prevent skin troubles near the urethral opening and anus.

[0047] Here, the length from the longitudinal center to the abdominal ends of the pair of grooves 8SL, 8SR when the diaper 1 is folded in half with its longitudinal ends overlapping each other will be specified. The two-dot chain line FL in Fig. 3 is the fold line when the diaper 1 is folded in half with its longitudinal ends overlapping each other, and represents the longitudinal center of the diaper 1. When the diaper 1 is folded in half at the two-dot chain line FL, if the length (L1 in Fig. 3) from the longitudinal center (two-dot chain line FL) of the diaper 1 to the abdominal ends of the pair of grooves 8SL, 8SR is within the range of 90 mm to 100 mm, the diaper 1 is suitable for babies weighing 5 kg to 13 kg. Furthermore, when the diaper 1 is folded in half along the two-dot chain line FL, if the length (L1) of the ventral ends of the pair of grooves 8SL, 8SR from the longitudinal center of the diaper 1 (two-dot chain line FL) is within the range of 85 mm to 95 mm, the diaper 1 is suitable for babies weighing 8 kg to 15 kg. Furthermore, when the diaper 1 is folded in half along the two-dot chain line FL, if the length (L1) of the ventral ends of the pair of grooves 8SL, 8SR from the longitudinal center of the diaper 1 (two-dot chain line FL) is within the range of 110 mm to 120 mm, the diaper 1 is suitable for babies weighing 11 kg to 23 kg. Furthermore, when the diaper 1 is folded in half along the two-dotted line FL, if the length (L1) from the longitudinal center of the diaper 1 (the two-dotted line FL) to the ventral end of the pair of grooves 8SL, 8SR is within the range of 100 mm or more and 110 mm or less, the diaper 1 is suitable for infants weighing 12 kg or more and 29 kg or less.

[0048] It is preferable that no stretchable member (elastic member) such as rubber thread is disposed in the urethral opening corresponding region 40. By not disposing a stretchable member in the urethral opening corresponding region 40, it is possible to prevent the formation of a space for storing urine from being hindered.

[0049] The space for collecting urine is formed by the diaper 1 expanding in a dome shape toward the non-skin facing side from an imaginary rising line L3, which is shown as a rectangle with a thick dotted line in Fig. 3. The position of the rising line L3 will be described below.

[0050] The tummy gathers 3T are formed on both sides in the width direction of the urethral opening corresponding region 40, and are formed widthwise outward of an extension of the ventral side (front body region 1F side) of the pair of grooves 8SL, 8SR. The tummy gathers 3T on the front body region 1F side are the arrangement region of the elastic threads 4F4, 4F5, which are arranged on both sides in the width direction of the urethral opening corresponding region 40, and are arranged widthwise outward of an extension of the ventral side (front body region 1F side) of the pair of grooves 8SL, 8SR. When the diaper 1 is worn, it is necessary to form a space for storing urine that includes at least the urethral opening corresponding region 40, but on the other hand, if this space is too wide, urine will not enter anywhere other than the grooves 8SL, 8SR. This is because there is a risk that urine may flow out into the diaper 1, and therefore it is necessary to form a space large enough to store the amount of urine excreted by the baby at one time. Therefore, in this embodiment, the urethral opening corresponding area 40 is not pressed toward the skin surface, but the widthwise end of the tummy gathers 3T is pressed toward the skin surface by the contraction force of the elastic threads 4F4, 4F5, at a position outside in the widthwise direction from the extension line of the pair of grooves 8SL, 8SR, so that the widthwise end of the standing line L3 is defined as the widthwise end of the tummy gathers 3T. This makes it possible for the diaper 1 to prevent this space from expanding more than necessary in the widthwise direction.

[0051] In addition, the length of the urethral opening corresponding region 40 in the longitudinal direction of the diaper 1 (L2 in Fig. 3) is preferably 50 mm, taking into consideration the position of the urethral opening of an infant, etc. In addition, as shown in Fig. 3, the rubber threads 4F4, 4F5 arranged on the widthwise outer side of the urethral opening corresponding region 40 are arranged at shorter intervals than the rubber threads 4F5 arranged on the widthwise outer side of the abdominal ends of the pair of grooves 8SL, 8SR. For this reason, the tummy gathers 3T have a greater stretching force on the widthwise outer side of the urethral opening corresponding region 40 than on the widthwise outer side of the abdominal ends of the pair of grooves 8SL, 8SR. This is because the abdominal ends of the grooves 8SL, 8SR define the rising line L3 on the crotch region 1B side of the space formation, so that the diaper 1 may be pressed toward the skin with a necessary and sufficient force on the widthwise outer sides of the grooves 8SL, 8SR, but if the widthwise outer sides of the urethral opening corresponding region 40 have a stretching force similar to or weaker than the widthwise outer sides of the grooves 8SL, 8SR, the space will widen in the width direction, making it impossible to maintain a space large enough to store the amount of urine discharged by an infant at one time. In the diaper 1 according to this embodiment, the widthwise outer sides of the urethral opening corresponding region 40 have a stretching force greater than that of the widthwise outer sides of the abdominal ends of the pair of grooves 8SL, 8SR in the tummy gathers 3T, thereby preventing the space from becoming too wide and appropriately maintaining the space for storing urine.

[0052] Additionally, waist gathers 3R are provided on the ventral side of the urethral opening corresponding region 40. The waist gathers 3R press the diaper 1 in the skin-facing direction to define the rising line L3 on the ventral side of the space for storing urine. That is, the crotch region 1B side of the waist gathers 3R (the elastic thread 4F3 on the crotch region 1B side) defines the rising line L3 on the ventral side of the space. The waist gathers 3R of the diaper 1 according to this embodiment prevent the space from becoming too wide on the ventral side, and can appropriately maintain the space for storing urine.

[0053] 3, in a plan view of the diaper 1, the longitudinal end of the absorbent body 8 is located inside the ventral end (the end on the front body region 1F side) of the pad cover sheet 6, and a part of the elastic thread 4F3 forming the waist gather 3R overlaps with the absorbent body 8. As a result, in the diaper 1, the ventral end of the pad cover sheet 6 or the absorbent body 8 is not defined as the ventral standing line L3 of the space, but the end of the waist gather 3R on the crotch region 1B side is defined as the ventral standing line L3 of the space. If the ventral end of the pad cover sheet 6 or the absorbent body 8 is defined as the physical standing line of the space, this physical standing line may come into contact with the urethral opening or the skin around it, causing problems such as skin trouble. In contrast, the diaper 1 of this embodiment can define the crotch region 1B side of the waist gather 3R as a virtual standing line L3 on the ventral side of the space, thereby forming a space for storing urine while preventing problems such as skin troubles that can occur when the physical standing line comes into contact with the urethral opening or the skin around it.

[0054] In addition, the widthwise length of the overlapping portion 8A of the absorbent body 8 overlapping with the waist gather 3R is shorter than the widthwise length of a portion 8B on the crotch side of the overlapping portion 8A. Here, the overlapping portion 8A is a portion in the absorbent body 8 that overlaps with the rubber thread 4F3, and the portion 8B on the crotch side is a portion on the crotch region 1B side of the overlapping portion 8A. By employing an absorbent body 8 having such a shape, the ends of the overlapping portion 8A in the widthwise direction shrink inward in the widthwise direction, making it easier to form a space for storing urine.

[0055] In addition, as shown in FIG. 3, when the diaper 1 is viewed in plan, the elastic threads 4F4, 4 The end of F5 in the width direction overlaps with the absorbent body 8 and is directly or indirectly bonded to the absorbent body 8. Here, the end and the absorbent body 8 are directly bonded to each other, and the end and the absorbent body 8 are indirectly bonded to each other, and the end and the absorbent body 8 are indirectly bonded to each other through the inner cover sheet 5F, the pad cover sheet 6, and the back sheet 7. In this embodiment, the end and the absorbent body 8 are indirectly bonded to each other. If the rubber threads 4F4 and 4F5 are provided on the width direction outer side of the absorbent body 8 and the absorbent body 8 and the rubber threads 4F4 and 4F5 are not directly or indirectly bonded to each other, the elasticity of the rubber threads 4F4 and 4F5 will be exerted on the width direction outer side of the absorbent body 8, and this contraction force will not be able to contribute to the formation of a space for storing urine. In the diaper 1 according to this embodiment, the widthwise ends of the rubber threads 4F4, 4F5 are indirectly bonded to the absorbent 8, and therefore the stretching force of the rubber threads 4F4, 4F5 can contribute to the formation of spaces. Note that the stretching force of the rubber threads 4F4, 4F5 is exerted when the diaper 1 is worn because the tummy gathers 3T are pulled outward in the widthwise direction more than when the diaper 1 is not worn.

[0056] Incidentally, in the diaper 1 according to the above embodiment, a weakly acidic sheet is used as the top sheet 9 that contacts the wearer's skin. Here, for example, when pressure is applied to the absorbent body 8 by the wearer's movement, backflow may occur, in which liquid excreted from the wearer and held in the absorbent body 8 is pushed out of the absorbent body 8 and returns to the wearer's skin. However, since the top sheet 9 is weakly acidic, even if backflow occurs, alkaline components such as ammonia contained in the liquid can be neutralized by the pH adjusting component of the top sheet 9. Therefore, the wearer's skin can be maintained from weakly acidic to neutral, and the occurrence of skin troubles can be suppressed.

[0057] However, the inventors of the present application have discovered that when the top sheet 9 is wet with backflowing liquid or the like, the top sheet 9 may become covered with the liquid and the weak acidic properties of the top sheet 9 may not be fully exhibited.

[0058] The inventors of the present application measured the pH of the top sheet 9 of the present application, which is imparted with weak acidity, and the normal top sheet, which is not imparted with weak acidity. In measuring the pH, a pH meter (main body: HI99181N, electrode: HI1414D / 50) manufactured by Hanna Instruments was used. Then, the top sheet 9 of the present application and the normal top sheet were each placed on a polypropylene (PP) bat, and the value displayed on the main body was read when the electrode was brought into contact with the sheet. At this time, the top sheet 9 of the present application showed, for example, a weak acidity of pH 5.8, and the normal top sheet showed, for example, a neutrality of pH 6.8. Furthermore, in order to confirm whether the sheet can maintain its properties even when wet, each of the top sheet 9 of the present application and the normal top sheet was wetted with ion-exchanged water, and the pH of each sheet was measured. At this time, both the top sheet 9 of the present application and the normal top sheet showed a pH of 7.0±0.1, that is, the pH of ion-exchanged water. This indicates that when the sheet is wet, the pH of the liquid covering the sheet has a large effect, and the properties of the sheet are not fully exhibited.

[0059] Therefore, in the diaper 1 according to this embodiment, the absorbent body 8 has grooves 8SL, 8SR penetrating the absorbent body 8 in the thickness direction so that the properties of the sheet can be fully exhibited.

[0060] Fig. 4 is a diagram illustrating the flow of urine excreted by a wearer in the diaper 1 according to the first embodiment. In Fig. 4, the skin SK of the wearer is also shown in order to more clearly illustrate the flow of urine excreted by the wearer.

[0061] As shown by the arrows in FIG. 4, urine excreted by the wearer passes through the top sheet 9 and is absorbed. The urine is temporarily stored in the space S1 formed in the area of ​​the front body region 1F of the absorbent 8. The space S1 includes the urethral meatus abutment area 40 as described above. In this embodiment, the absorbent 8 has grooves 8SL and 8SR penetrating the absorbent 8 in the thickness direction, so that the urine stored in the space S1 can be moved from the skin-facing surface of the absorbent 8 (the surface on the top sheet 9 side in FIG. 4) to the non-skin-facing surface (the surface on the back sheet 7 side in FIG. 4) via the grooves 8SL and 8SR. This allows the urine stored in the space S1 to be rapidly absorbed and retained not only in the skin-facing surface of the absorbent 8 but also in the non-skin-facing surface, so that the top sheet 9 can be rapidly dried. This allows the weak acidity of the top sheet 9 to be fully exerted.

[0062] Moreover, the grooves 8SL and 8SR that penetrate in the thickness direction allow urine stored in the space S1 to move from the skin-facing surface of the absorbent body 8 to the non-skin-facing surface, making it possible to prevent urine from concentrating on the skin-facing surface of the absorbent body 8 and being retained there. This makes it possible to prevent urine from flowing back from the skin-facing surface of the absorbent body 8.

[0063] Furthermore, by extending the grooves 8SL, 8SR in the longitudinal direction, urine stored in the space S1 can be rapidly transferred from the region on the front body region 1F side through the region on the crotch region 1B side to the region on the back body region 1R side (from the right region through the central region to the left region in FIG. 4) via the grooves 8SL, 8SR. This allows urine stored in the space S1 to rapidly permeate and be retained throughout the entire longitudinal direction of the absorbent body 8, allowing the top sheet 9 to dry even more rapidly. This allows the weak acidity of the top sheet 9 to be exhibited even more fully.

[0064] Moreover, the grooves 8SL, 8SR extending in the longitudinal direction allow the urine stored in the space S1 to move not only to the space S1 of the absorber 8, i.e., the urethral opening contact region 40 and its surrounding area, but also to the area on the crotch region 1B side and the area on the back body region 1R side, so that it is possible to prevent urine from concentrating in the urethral opening contact region 40 of the absorber 8 and its surrounding area and being retained there. This makes it possible to suppress backflow from the urethral opening contact region 40 of the absorber 8 and its surrounding area.

[0065] <Variation 1> Next, a diaper 1 according to a first modified example of the first embodiment will be described. FIG. 5 is a longitudinal cross-sectional view of the absorbent 8 when only the absorbent 8 is extracted from the diaper 1 according to this modified example and cut at a cross section including the groove 8SL. In this modified example, the groove 8SL may be formed so as to become gradually shallower toward both ends in the longitudinal direction. Such a groove 8SL is formed when the absorbent 8 is produced by a forming drum. The groove 8SR also has a similar shape to the groove 8SL. In the diaper 1 according to this modified example, the pair of grooves 8SL, 8SR are formed so as to become shallower at both ends in the longitudinal direction, thereby slowing down the flow rate of urine flowing out of the grooves from the longitudinal ends of the grooves 8SL, 8SR, and suppressing urine leakage caused by urine rushing out of the grooves 8SL, 8SR at a high flow rate. Furthermore, in the diaper 1 of this modified example, even if the longitudinal ends of the grooves 8SL, 8SR come into contact with the urethral opening or the skin in the vicinity thereof, the contact of the grooves 8SL, 8SR with the urethral opening or the skin in the vicinity thereof can be reduced.

[0066] <Variation 2> Next, a diaper 1 according to a second modification of the first embodiment will be described. FIG. 6 is a schematic diagram showing the diaper 1 according to this modification in an unfolded and stretched state. In the diaper 1 according to this modification, the absorbent body 8 has a groove 8SM formed between a pair of grooves 8SL, 8SR and extending in the longitudinal direction of the diaper 1. The groove 8SM is formed in parallel with the grooves 8SL, 8SR, has the same shape and length as the grooves 8SL, 8SR, and is formed so as to be in the same position in the longitudinal direction as the grooves 8SL, 8SR. In the diaper 1 according to this modification, the absorbent body 8 has the groove 8SM. As a result, the absorbent body 8 can be easily folded along the grooves 8SM, and therefore, when the absorbent body is worn, spaces for storing urine can be easily formed.

[0067] <Second embodiment> Next, a second embodiment will be described. In the diaper 1 according to the first embodiment, the grooves 8SL, 8SR penetrate the absorbent body 8 in the thickness direction, but the present invention is not limited to this. For example, the grooves 8SL, 8SR may be formed in a concave shape that does not penetrate the absorbent body 8.

[0068] Fig. 7 is a schematic diagram showing the diaper 1 according to the second embodiment in an unfolded and stretched state. Fig. 7(A) shows a schematic diagram of the internal structure of the diaper 1 in an unfolded and stretched state as viewed from the left side. Fig. 7(B) shows a schematic diagram of a plan view of the diaper 1 in an unfolded and stretched state. The diaper 1 according to this embodiment has the same configuration as the diaper 1 according to the first embodiment except for the configuration of the absorbent body. Therefore, in the diaper 1 according to this embodiment, the same components as those in the diaper 1 according to the first embodiment are denoted by the same reference numerals and their description will be omitted.

[0069] As shown in FIG. 7, in the diaper 1 according to this embodiment, the absorbent 8 has a pair of grooves 8TL, 8TR extending in the longitudinal direction of the diaper 1. The pair of grooves 8TL, 8TR have a concave shape that is concave from the skin-facing surface of the absorbent 8 to the non-skin-facing side in the thickness direction, and extend from the center of the crotch region 1B. The grooves 8TL, 8TR have the same length, width, and depth, and are arranged at the same position in the longitudinal direction of the diaper 1. The grooves 8TL, 8TR are arranged symmetrically with respect to the center in the width direction of the diaper 1, and are formed parallel to each other. The distance W between the center lines of the grooves 8TL, 8TR and the length L1 from the center in the longitudinal direction of the diaper 1 to the abdominal end of the pair of grooves 8TL, 8TR are set to the same values ​​as the distance W between the center lines of the grooves 8SL, 8SR and the length L1 from the center in the longitudinal direction of the diaper 1 to the abdominal end of the pair of grooves 8SL, 8SR in the first embodiment. Due to the configuration and arrangement of the grooves 8TL, 8TR, in the diaper 1 of this embodiment, as in the diaper 1 of the first embodiment, a space S1 for storing urine is formed in the area of ​​the absorbent body 8 on the front body region 1F side.

[0070] The absorbent body 8 has a circular through-hole 8TH penetrating in the thickness direction of the absorbent body 8. The through-hole 8TH is provided in the urethral opening corresponding region 40. The shape of the through-hole 8TH is not limited to a circular shape. For example, the shape of the through-hole 8TH may be an elliptical shape.

[0071] FIG. 8 is a diagram illustrating the flow of urine excreted by a wearer in the diaper 1 according to the second embodiment.

[0072] In the diaper 1 according to the present embodiment, the absorbent 8 has through-holes 8TH penetrating in the thickness direction of the absorbent 8, so that urine stored in the space S1 for storing urine can be moved from the skin-facing surface of the absorbent 8 (the surface on the top sheet 9 side in FIG. 8) to the non-skin-facing surface (the surface on the back sheet 7 side in FIG. 8) as shown by the arrow in FIG. 8. Moreover, since the through-holes 8TH are provided in the urethral meatus abutting region 40 in the space S1, the urine stored in the space S1 can be efficiently moved to the non-skin-facing surface of the absorbent 8. This allows the urine stored in the space S1 to quickly penetrate not only the skin-facing surface of the absorbent 8 but also the non-skin-facing surface and be retained there, so that the top sheet 9 can be quickly dried. This allows the weak acidity of the top sheet 9 to be fully exhibited.

[0073] Furthermore, the through holes 8TH can prevent urine from infiltrating concentratedly into the skin-facing side of the absorbent body 8 and being retained there. This can prevent urine from flowing back from the skin-facing surface of the absorbent body 8.

[0074] Furthermore, by having the grooves 8TL, 8TR extending in the longitudinal direction, the urine stored in the space S1 can be rapidly transferred via the grooves 8TL, 8TR from the region on the skin-facing side of the absorbent 8 on the front body region 1F side through the region on the crotch region 1B side to the region on the back body region 1R side (from the right side region through the central region to the left side region in FIG. 8). This allows the urine stored in the space S1 to rapidly permeate and be retained over the entire longitudinal portion of the skin-facing side of the absorbent 8, allowing the top sheet 9 to be dried even more rapidly. This allows the weak acidity of the top sheet 9 to be exhibited even more fully.

[0075] Moreover, the grooves 8TL and 8TR can prevent urine from intensively penetrating into and being retained in the urethral opening contact region 40 of the absorbent body 8 and its surrounding area. This can prevent urine from flowing back from the urethral opening contact region 40 of the absorbent body 8 and its surrounding area.

[0076] <Variation 1> Next, a diaper 1 according to a first modified example of the second embodiment will be described. FIG. 9 is a schematic diagram showing the diaper 1 according to this modified example in an unfolded and stretched state. As shown in FIG. 9, in the diaper 1 according to this modified example, the absorbent body 8 has a plurality of through holes 8TH (two in this modified example). The plurality of through holes 8TH are provided in the region around the urethral opening contact region 40. For example, the plurality of through holes 8TH are provided between the urethral opening contact region 40 and the ventral end of the grooves 8TL and 8TR. In the diaper 1 according to this modified example, since the through holes 8TH are provided in the region around the urethral opening contact region 40, the plurality of through holes 8TH are unlikely to contact the urethral opening even through the top sheet 9. This prevents the diaper 1 from irritating the urethral opening due to the through holes 8TH, and prevents skin troubles around the urethral opening from occurring.

[0077] <Variation 2> Next, a diaper 1 according to Modification 2 of the second embodiment will be described. Fig. 10 is a plan view of the absorbent body 8 extracted from the diaper 1 according to this modification, as viewed from the non-skin facing side. Fig. 11 is a diagram illustrating the flow of urine discharged by a wearer in the diaper 1 according to this modification.

[0078] In the diaper 1 according to this modification, the absorbent 8 has a pair of grooves 8TL, 8TR extending in the longitudinal direction on the skin-facing surface, as in the diaper 1 according to the second embodiment. Furthermore, as shown in FIG. 10, the absorbent 8 has a pair of grooves 8UL, 8UR extending in the longitudinal direction on the non-skin-facing surface. The pair of grooves 8UL, 8UR are recessed in the thickness direction from the non-skin-facing surface of the absorbent 8 toward the skin-facing side, and extend with the crotch region 1B as the center. The grooves 8UL, 8UR have the same length, width, and depth, and are disposed at the same position in the longitudinal direction of the diaper 1. The grooves 8UL, 8UR are disposed symmetrically with respect to the center of the width of the diaper 1, and are formed parallel to each other. In addition, the distance W between the center lines of each of the grooves 8UL, 8UR and the length L1 from the longitudinal center of the diaper 1 to the abdominal ends of the pair of grooves 8UL, 8UR are set to the same values ​​as the distance W between the center lines of each of the grooves 8SL, 8SR and the length L1 from the longitudinal center of the diaper 1 to the abdominal ends of the pair of grooves 8SL, 8SR in the diaper 1 of the first embodiment.

[0079] In the diaper 1 according to this modification, as in the diaper 1 according to the second embodiment, the absorbent body 8 is provided with through-holes 8TH, so that urine stored in the urine-storing space S1 can be moved from the skin-facing surface of the absorbent body 8 to the non-skin-facing surface via the through-holes 8TH, as shown by the arrows in Fig. 11. Furthermore, in the diaper 1 according to this modification, the absorbent body 8 is provided with grooves 8UL, 8UR extending in the longitudinal direction, so that urine that has moved to the non-skin-facing side of the absorbent body 8 can be easily removed. can be rapidly transferred via the grooves 8UL, 8UR from the region on the non-skin facing side of the absorbent 8 on the front body region 1F side through the region on the crotch region 1B side to the region on the back body region 1R side (from the right side through the central region to the left side in FIG. 11). This allows urine stored in the space S1 to rapidly permeate the entire longitudinal direction of the non-skin facing side of the absorbent 8 and be retained there, allowing the top sheet 9 to be dried even more rapidly. This allows the weak acidity of the top sheet 9 to be exhibited even more fully.

[0080] In the diaper 1 according to this modification, the grooves 8TL, 8TR, 8UL, and 8UR are provided on both the skin-facing and non-skin-facing surfaces of the absorbent body 8, but this is not limiting. For example, the grooves 8TL and 8TR may not be provided on the skin-facing surface of the absorbent body 8, and only the grooves 8UL and 8UR may be provided on the non-skin-facing surface of the absorbent body 8.

[0081] <Other embodiments> Next, other embodiments will be described. In the diaper 1 according to the above embodiment, the grooves 8SL, 8SR, 8TL, 8TR, or 8UL, 8UR are formed to extend linearly in the longitudinal direction, but the present invention is not limited to this. For example, the grooves 8SL, 8SR, 8TL, 8TR, or 8UL, 8UR may extend to curve outward in the width direction at both longitudinal end sides when the diaper 1 is viewed in plan. The grooves 8SL, 8SR, 8TL, 8TR, or 8UL, 8UR may have a longitudinal component. [Explanation of symbols]

[0082] 1. Diapers 1B...Inseam area 1F: Front body area 1R: Back body area 2T··Body opening 2L·Left lower limb opening 2R・Right lower limb opening 3BL, 3BR: 3D gathers 3R: Waist gather 3T··Tummy Gather 4F, 4R··Cover sheet 4F2, 4F3, 4F4, 4F5, 4R2, 4R3, 4R4, 4R5, 10L1, 10R1... Rubber thread 4F6,4R6... Perforation 10L2, 10R2 ·· Folding line 4F7, 4F8, 4R7, 4R8... Edge 5F, 5R··Inner cover sheet 6··Pad cover sheet 7. Back sheet 8. Absorber 8SL,8SR,8SM,8TL,8TR,8UL,8UR··Groove 8TH·Through hole 9. Top sheet 10L, 10R: Side seat 11F, 11R: Air passage forming sheet 11F1, 11R1...Ventilation holes 30 Anal Corresponding Area 40 Urethral opening area FL··Fold line WL··Welded part S1: Space for collecting urine

Claims

1. An absorbent article having a length along a longitudinal direction and a width along a width direction perpendicular to the longitudinal direction, An absorber; a liquid-permeable sheet that is disposed closer to the wearer than the absorbent body and comes into contact with the wearer's skin, and that contains a pH adjusting component; Equipped with The absorbent body has a pair of through holes provided in the width direction penetrating the thickness direction of the absorbent body, and a space provided inward in the width direction of the pair of through holes when the absorbent body is worn. Absorbent articles.

2. The through hole is provided in at least one of a urethral opening corresponding region and a periphery of the urethral opening corresponding region. The absorbent article of claim 1.

3. The absorbent body has a pair of grooves extending in the longitudinal direction.

3. The absorbent article according to claim 1 or 2.

4. The first stretchable portion further includes a first stretchable member arranged in a stretched state on the outer side of the ventral end of the pair of grooves in the width direction, and stretches in the width direction. The absorbent article of claim 3.

5. The pair of grooves are disposed on the crotch side of the urethral opening corresponding area. The absorbent article of claim 4.

6. When the absorbent article is folded in half with the longitudinal ends overlapping each other, the length from the longitudinal center to the abdominal ends of the pair of grooves is within a range of 90 mm to 100 mm, and the absorbent article is for infants weighing 5 kg to 13 kg. The absorbent article of claim 5.

7. When the absorbent article is folded in half with the longitudinal ends overlapping each other, the length from the longitudinal center to the abdominal ends of the pair of grooves is within a range of 85 mm to 95 mm, and the absorbent article is for infants weighing 8 kg to 15 kg. The absorbent article of claim 5.

8. When the absorbent article is folded in half with the longitudinal ends overlapping each other, the length from the longitudinal center to the abdominal ends of the pair of grooves is within a range of 110 mm to 120 mm, and the absorbent article is for infants weighing 11 kg to 23 kg. The absorbent article of claim 5.

9. When the absorbent article is folded in half with the longitudinal ends overlapping each other, the length from the longitudinal center to the abdominal ends of the pair of grooves is within a range of 100 mm to 110 mm, and the absorbent article is for infants weighing 12 kg to 29 kg. The absorbent article of claim 5.

10. The distance between the center lines of the pair of grooves is 20 mm or more and 50 mm or less.

10. The absorbent article according to any one of claims 4 to 9.

11. The pair of grooves are the through holes.

11. The absorbent article according to any one of claims 3 to 10.

12. The pair of grooves is at least one of a concave groove provided on a surface of the absorbent body facing the wearer's skin and recessed on the side opposite to the skin side, and a concave groove provided on a surface of the absorbent body facing the side opposite to the skin side and recessed on the skin side.

11. The absorbent article according to any one of claims 3 to 10.

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