Absorbent articles

Abstract

To provide a technology capable of retaining feces.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 that has a pair of grooves extended in the longitudinal direction, and a first stretchable part that has a first stretchable member arranged in an extended state on the width-direction outsides of the dorsal ends of the pair of grooves and that is expanded / contracted in the width direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] 2. Description of the Related Art Absorbent articles such as disposable diapers, incontinence pads, sanitary products, etc. are known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-175885 A Summary of the Invention [Problem to be solved by the invention]

[0004] In some absorbent articles, grooves are provided in the absorbent body that extend from the abdomen through the crotch area toward the back when the article is worn by a wearer. Absorbent articles with such a structure can diffuse urine excreted by the wearer throughout the absorbent body by directing the urine into the grooves. However, although absorbent articles can diffuse urine by the grooves, there has been no specific proposal for using the grooves to retain feces.

[0005] Therefore, an object of the present invention is to provide a technology capable of retaining feces. [Means for solving the problem]

[0006] In order to solve the above problems, in the present invention, a pair of grooves extending in the longitudinal direction and a first stretchable portion are provided on the outer side in the width direction of the ventral end portions of the pair of grooves.

[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 absorbent article comprising an absorbent body having a pair of grooves extending in the longitudinal direction; The first stretchable portion has a first stretchable member arranged in a stretched state on the widthwise outer side of the back end of the pair of grooves, and stretches in the width direction.

[0008] The pair of grooves may be disposed on the crotch side of the anus corresponding region.

[0009] The absorbent article may be for use by infants and young children weighing 5 kg or more and 13 kg or less, in which the length from the longitudinal center to the rear end of the pair of grooves is within the range of 90 mm or more and 100 mm or less when the absorbent article is folded in half with the longitudinal ends overlapping each other.

[0010] The absorbent article may be for use with infants and young children weighing 8 kg or more and 15 kg or less, in which the length from the longitudinal center to the rear end 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.

[0011] 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 rear end 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.

[0012] The absorbent article may be for use by 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 rear end 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.

[0013] The anus corresponding region may be adjacent to the rear side of the absorbent article.

[0014] The stretchable member may not be disposed in the area corresponding to the anus.

[0015] The first stretchable portions may be formed on both sides in the width direction of the anus corresponding region, and on the outer side in the width direction of the extension lines of the back sides of the pair of grooves.

[0016] The length of the anus corresponding region in the longitudinal direction may be 50 mm, and the first stretchable portion may have a greater stretching force at the outer side in the width direction of the anus corresponding region than at the outer side in the width direction of the back ends of the pair of grooves.

[0017] A waist opening is provided on the back side of the anus corresponding region and around the waist of the wearer, and the waist opening extends along at least a part of the waist opening. long and a second stretchable section having a second stretchable member arranged in a stretched state to stretch the torso opening.

[0018] The absorbent article comprises an outer layer sheet that forms the outer surface of the absorbent article, and when the absorbent article is viewed in a plan view, the rear end of the absorbent body is located inside the longitudinal end of the outer layer sheet, and a portion of the second stretchable portion may overlap the absorbent body.

[0019] The widthwise length of the overlapping portion that overlaps with the second elastic portion of the absorbent body may be shorter than the widthwise length of a portion of the absorbent body on the crotch side of the overlapping portion.

[0020] When the absorbent article is viewed in plan, the ends in the width direction of the first stretchable member may overlap the absorbent body and be directly or indirectly bonded to the absorbent body.

[0021] The pair of grooves may penetrate the absorbent body in the thickness direction.

[0022] The pair of grooves may be formed so as to become gradually shallower toward both ends in the longitudinal direction.

[0023] The absorbent body may have another groove formed between the pair of grooves and extending in the longitudinal direction.

[0024] The pair of grooves may be disposed on the crotch side of the urethral opening corresponding area. Effect of the Invention

[0025] According to the present invention, feces can be retained. [Brief description of the drawings]

[0026] [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 embodiment in an unfolded and stretched state. [Figure 4] FIG. 4 is a longitudinal cross-sectional view of the absorbent body when only the absorbent body is extracted from the diaper according to the first modified embodiment and cut at a cross section including the groove. [Diagram 5] FIG. 5 is a schematic diagram showing a diaper according to the second modification of the embodiment in an unfolded and stretched state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] 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.

[0028] <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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] In the diaper 1, an absorbent capable of absorbing and retaining liquid is mainly disposed around the crotch region 1B. In addition, in order to prevent the formation of a gap between the diaper 1 and the wearer's skin that can be a liquid outflow path, the diaper 1 is provided with a three-dimensional gather 3BL at the left lower leg opening 2L surrounding the thigh of the left lower leg of the wearer, a three-dimensional gather 3BR at the right lower leg opening 2R surrounding the thigh of the right lower leg of the wearer, and a waist gather 3R (an example of the "second stretchable section" in this application) at a portion surrounding the wearer's abdominal circumference. In addition, a tummy gather 3T (an example of the "first stretchable section" in this application) is formed on the crotch region 1B side of the waist gather 3R. The three-dimensional gathers 3BL, 3BR, the waist gathers 3R, and the tummy gathers are in close contact with the wearer's skin by the elastic force of the elastic member. Therefore, the excreted liquid discharged from the wearer's private parts is absorbed by the absorbent of the diaper 1 with almost no leakage from the diaper 1. The elastic member may be selected from rubber threads or bands as appropriate, and in this embodiment, rubber threads (rubber threads) are used.

[0033] 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 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.

[0034] The diaper 1 has cover sheets 4F, 4R and a pad cover sheet 6 (an example of the "outer layer sheet" in the present application) 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 feel. 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 pores of about 0.1 to several μm formed therein so as to exhibit liquid impermeability and moisture permeability. Furthermore, the cover sheets 4F, 4R may have a plurality of holes formed in a part or entirely in order to improve the breathability around the waist.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] The absorbent body 8 is made of short fibers of cellulosic fibers such as pulp fibers, rayon fibers, or cotton fibers, or short fibers of synthetic fibers such as polyethylene, polypropylene, or polyethylene terephthalate that have been hydrophilized, and the gaps between the short fibers are crosslinked to absorb and retain water. The absorbent body 8 has a structure in which granular absorbent resin such as a hydrophilic superabsorbent polymer having a structure is held. Therefore, 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 overlapped. The absorbent body 8 may have an appropriate shape depending on 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] In the air passage forming sheet 11F, a large number of minute ventilation holes 11F1 for ventilation are arranged in an area extending in the left-right direction along the upper edge of the front body region 1F. In the air passage forming sheet 11R, a large number of ventilation holes 11R1 are arranged, similar to the air passage forming sheet 11F. Here, the ventilation hole means an opening that connects a space on one side of the sheet with a space on the other side, and its shape is not particularly limited. Therefore, the ventilation holes 11F1, 11R1 can be, for example, an opening having a circular, elliptical, polygonal (triangle, square, etc.) shape. The formation of the ventilation holes 11F1, 11R1 in the air passage forming sheets 11F, 11R is carried out by the air passage forming It does not mean that the sheets 11F, 11R are made of a material that has no air permeability, and the air passage forming sheets 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 sheets 11F, 11R are preferably made of a material that has air permeability and liquid permeability, but may be made of, for example, a material that does not have air permeability. The size and number of the air holes 11F1, 11R1 are not particularly limited, but for example, an opening area of ​​0.5 to 10 mm 2 It is preferable that about 5 to 200 holes are formed.

[0043] 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.

[0044] 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.

[0045] The waist gather 3R is formed by stretching the elastic threads 4F2 and 4F3 against the cover sheet 4F. long The rubber threads 4R2 and 4R3 (an example of the "second elastic member" in the present application) are bonded to the cover sheet 4R in a stretched state. longThe rubber threads 4F2 and 4F3 are bonded to the cover sheet 4F in the following order: the rubber thread 4F2, the rubber thread 4F3, from the perforation 4F6 side along the perforation 4F6 that will form the upper edge of the front body region 1F when folded back. Similarly to the rubber threads 4F2 and 4F3, the rubber threads 4R2 and 4R3 are bonded to the cover sheet 4R in the following order: the rubber thread 4R2, the rubber thread 4R3, from the perforation 4R6 side along the perforation 4R6 that will form the upper edge of the back body region 1R when folded back. For this reason, 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 and 4R3 are provided on the cover sheet 4R in such a way that the longitudinal direction, which is the stretch direction, is the width direction (left-right direction) of the diaper 1. Therefore, 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 contractile 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 may be applied to the rubber threads 4F2, 4F3, 4R2, 4R3, or may be applied to the cover sheets 4F, 4R. The rubber threads 4F2, 4F3, 4R2, 4R3 may be joined to the cover sheets 4F, 4R by ultrasonic welding instead of by adhesive. Since the length of the rubber threads 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.

[0046] Furthermore, the cover sheet 4F has elastic threads 4F4 and 4F5 stretched thereon. longThe cover sheet 4R is attached in a stretched state, and the rubber threads 4R4 and 4R5 are stretched on the cover sheet 4R. long The rubber threads 4F4 and 4F5 are elastic members provided in the cover sheet 4F in an area closer to the crotch region 1B than the rubber thread 4F3. In the diaper 1, the rubber threads 4F4, 4F5, 4R4 and 4R5 form a tummy gather 3T on the crotch region 1B side than the waist gather 3R. However, unlike the rubber threads 4F2 and 4F3 that extend from the left end to the right end of the cover sheet 4F, the rubber threads 4F4 and 4F5 have their widthwise center portions cut by a predetermined width. The cover sheet 4F has the rubber threads 4F4 and 4F5 whose widthwise center portions are cut, so that the expansion of the absorbent body 8 due to water absorption is not hindered and the cover sheet 4F provides an appropriate feeling of close contact with the lower abdomen of the wearer. 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.

[0047] 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.

[0048] Moreover, the rubber thread 4R5 (an example of the "first elastic member" in the present application) is arranged in a stretched state on the outer side of the end (back end) of the pair of grooves 8SL, 8SR on the rear body region 1R side in the width direction of the diaper 1. Here, the diaper 1 according to the present embodiment is suitable for male and female infants. The region 30 illustrated by the elliptical dotted line in FIG. 3 is an anus-corresponding region corresponding to the wearer's anus (hereinafter referred to as "anus-corresponding region 30"). 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 anus-corresponding region 30 is arranged on the rear body region 1R side of the diaper 1, and the pair of grooves 8SL, 8SR are arranged on the crotch region 1B side of the anus-corresponding region 30. The anus-corresponding region 30 is adjacent to the back side of the diaper 1. Here, the back side portion is the rear body region 1R side of the waist gather 3R, and is the arrangement region of the elastic threads 4R2, 4R3. In other words, the anus corresponding region 30 is adjacent to the waist gather 3R on the rear body region 1R side.

[0049] 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 4R5, 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 4R5 pulling the diaper 1 outward in the width direction between the pair of grooves 8SL, 8SR is inhibited by the grooves 8SL, 8SR, making it easier for the area between the pair of grooves 8SL, 8SR to separate from the skin surface compared to the outer side of the pair of grooves 8SL, 8SR in the width direction. When worn, the diaper 1 can retain feces discharged into the anus-corresponding region 30 in this space. This allows the diaper 1 according to this embodiment to retain feces.

[0050] 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, 8SR is W. The distance W is set to 20 mm or more and 70 mm or less, taking into consideration the size of the baby's body, so that a space capable of holding feces when the diaper is being worn is formed. This forms a space for holding feces suitable for a baby. In addition, since the grooves 8SL, 8SR are provided closer to the crotch region 1B than the anus corresponding region 30, the grooves 8SL, 8SR are less likely to come into contact with the buttocks even through the top sheet 9. This prevents the grooves 8SL, 8SR from irritating the buttocks. This helps prevent skin problems on the buttocks.

[0051] 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 corresponding to the urethral opening of the wearer shown in Fig. 3, 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. 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. This prevents the grooves 8SL, 8SR from irritating the urethral opening or anus, and prevents skin troubles near the urethral opening or anus.

[0052] Here, the length from the longitudinal center to the rear end 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 rear end 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 rear end 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 rear end 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) of the back end of the pair of grooves 8SL, 8SR from the longitudinal center of the diaper 1 (the two-dotted line FL) 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.

[0053] It is preferable that no stretchable member (elastic member) such as rubber thread is disposed in the anus corresponding region 30. By not disposing a stretchable member in the anus corresponding region 30, it is possible to prevent the formation of a space for retaining feces from being hindered.

[0054] The space for retaining feces 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.

[0055] The tummy gathers 3T are formed on both sides of the anus corresponding region 30 in the width direction, and are formed on the outside in the width direction of the extension of the back side (the rear body region 1R side) of the pair of grooves 8SL, 8SR. The tummy gathers 3T on the rear body region 1R side are the arrangement region of the rubber threads 4R4, 4R5, and the rubber threads 4R4, 4R5 are formed on both sides of the anus corresponding region 30 in the width direction, and are formed on the outside in the width direction of the extension of the back side (the rear body region 1R side) of the pair of grooves 8SL, 8SR. When the diaper 1 is worn, it is necessary to form a space that includes at least the anus corresponding region 30 and holds feces, but if this space is too wide, there is a risk that it will not be able to hold feces, so it is necessary to form a space large enough to hold the amount of feces a baby voids in one go. Therefore, in this embodiment, instead of pressing the anus corresponding region 30 toward the skin surface, the widthwise end of the tummy gathers 3T is pressed toward the skin surface by the contraction force of the elastic threads 4R4, 4R5, on the outer side in the width direction of 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 to prevent the space in the diaper 1 from expanding more than necessary in the width direction.

[0056] In addition, the length of the anus corresponding region 30 in the longitudinal direction of the diaper 1 (L2 in Fig. 3) is preferably 50 mm, taking into consideration the position of the baby's anus, etc. In addition, as shown in Fig. 3, the rubber threads 4R4, 4R5 arranged on the widthwise outer side of the anus corresponding region 30 are arranged at shorter intervals than the rubber threads 4R5 arranged on the widthwise outer side of the back 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 anus corresponding region 30 than on the widthwise outer side of the back ends of the pair of grooves 8SL, 8SR. This is because the back 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 anus corresponding region 30 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 hold the amount of stool excreted by an infant at one time. In the diaper 1 according to this embodiment, by making the widthwise outer sides of the anus corresponding region 30 in the tummy gathers 3T more stretchable than the widthwise outer sides of the back ends of the pair of grooves 8SL, 8SR, the space is prevented from becoming too wide, and the space for holding stool can be appropriately maintained.

[0057] Additionally, waist gathers 3R are provided on the back side of the anus corresponding region 30. The waist gathers 3R press the diaper 1 in the skin-facing direction to define a rear standing line L3 of the space for retaining feces. That is, the crotch region 1B side of the waist gathers 3R (the elastic thread 4R3 on the crotch region 1B side) defines the rear standing line L3 of the space. The waist gathers 3R of the diaper 1 according to this embodiment prevent the space from becoming too wide on the rear side, and can appropriately maintain the space for retaining feces.

[0058] 3, in a plan view of the diaper 1, the longitudinal end of the absorbent body 8 is located inside the rear end (the end on the rear body region 1R side) of the pad cover sheet 6, and a part of the elastic thread 4F3 forming the waist gather 3R overlaps the absorbent body 8. As a result, in the diaper 1, the rear end of the pad cover sheet 6 or the absorbent body 8 is defined as the rear standing line L3 of the space, but the end of the waist gather 3R on the crotch region 1B side is defined as the rear standing line L3 of the space. If the rear 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 back side of the space, thereby forming a space for retaining feces while preventing problems such as skin troubles that can occur when a physical standing line abuts against the buttocks.

[0059] 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 the portion 8B on the crotch side of the overlapping portion 8A. Here, the overlapping portion 8A is the portion in the absorbent body 8 that overlaps with the rubber thread 4R3, and the portion 8B on the crotch side is the 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 retaining feces.

[0060] 3, in a plan view of the diaper 1, the widthwise ends of the rubber threads 4R4, 4R5 overlap with the absorbent body 8 and are directly or indirectly bonded to the absorbent body 8. Here, "directly bonded" the ends and the absorbent body 8 means that the ends and the absorbent body 8 are directly joined, and "indirectly bonded" the ends and the absorbent body 8 means that the ends and the absorbent body 8 are joined via the inner cover sheet 5R, the pad cover sheet 6, and the back sheet 7. In this embodiment, the ends and the absorbent body 8 are indirectly bonded. If the rubber threads 4R4, 4R5 are provided on the widthwise outer side of the absorbent body 8 and the absorbent body 8 and the rubber threads 4R4, 4R5 are not directly or indirectly bonded to each other, the elasticity of the rubber threads 4R4, 4R5 would be exerted on the widthwise outer side of the absorbent body 8, and this contraction force would not be able to contribute to the formation of a space for retaining feces. In the diaper 1 according to this embodiment, the ends of the rubber threads 4R4, 4R5 are indirectly bonded to the absorbent body 8, so that the stretching force of the rubber threads 4R4, 4R5 can contribute to the formation of spaces. Note that the stretching force of the rubber threads 4R4, 4R5 is exerted when the diaper 1 is worn because the tummy gathers 3T are pulled outward in the width direction more than when the diaper 1 is not worn.

[0061] <Variation 1> Next, a diaper 1 according to a first modified example of this embodiment will be described. FIG. 4 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 modification, even if the longitudinal ends of the grooves 8SL, 8SR come into contact with the urethral opening or the skin or buttocks in the vicinity thereof, the contact of the grooves 8SL, 8SR with the urethral opening or skin can be reduced.

[0062] <Variation 2> Next, a diaper 1 according to a second modification of this embodiment will be described. FIG. 5 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 (an example of the "another groove" in the present application) 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, with the same shape and length as the grooves 8SL, 8SR. The groove 8SM is also 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, which makes it easier for the absorbent body 8 to bend along the groove 8SM, and therefore makes it easier to form a space for retaining feces when the diaper 1 is worn.

[0063] <Other embodiments> Next, other embodiments will be described. In the diaper 1 according to the above 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. Moreover, the groove 8SM in the above modification 2 may also be formed in a concave shape that does not penetrate the absorbent body 8.

[0064] In addition, although the grooves 8SL and 8SR are formed to extend linearly in the longitudinal direction, the present invention is not limited to this. For example, the grooves 8SL and 8SR may extend to curve outward in the width direction at both longitudinal end sides when the diaper 1 is viewed in plan. It is sufficient that the grooves 8SL and 8SR have a longitudinal component. [Explanation of symbols]

[0065] 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·Groove 9. Top sheet 10L, 10R: Side seat 11F, 11R: Air passage forming sheet 11F1, 11R1...Ventilation holes 30 Anal area 40 Urethral opening area FL··Fold line L3...Rise line

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 absorbent body having a pair of grooves extending in the longitudinal direction; A first stretchable portion having a first stretchable member arranged in a stretched state on the outer side of the back end of the pair of grooves in the width direction and stretching in the width direction; Equipped with The pair of grooves are disposed on the crotch side of the anus corresponding region, The first stretchable portion has a larger stretching force at an outer side in the width direction of the anus corresponding region than at an outer side in the width direction of the back end portions of the pair of grooves. Absorbent articles.

2. When the absorbent article is folded in half with the longitudinal ends overlapping each other, the length from the longitudinal center to the rear end 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 1.

3. When the absorbent article is folded in half with the longitudinal ends overlapping each other, the length of the back end of the pair of grooves from the longitudinal center 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 1.

4. When the absorbent article is folded in half with the longitudinal ends overlapping each other, the length from the longitudinal center to the rear end 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 1.

5. When the absorbent article is folded in half with the longitudinal ends overlapping each other, the length from the longitudinal center to the rear end 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 1.

6. The anus-corresponding region is a rear adjacent portion of the absorbent article.

6. The absorbent article according to any one of claims 1 to 5.

7. No elastic member is disposed in the anus corresponding region.

7. The absorbent article according to any one of claims 1 to 6.

8. The first stretchable portion is formed on both sides of the anus corresponding region in the width direction and on the outer side in the width direction of the extension line of the back side of the pair of grooves.

8. The absorbent article according to any one of claims 1 to 7.

9. The length of the anus corresponding area in the longitudinal direction is 50 mm.

9. The absorbent article according to any one of claims 1 to 8.

10. A waist opening is provided on the back side of the anus corresponding region and through which the wearer's waist is placed; A second stretchable section having a second stretchable member arranged in a stretched state along at least a portion of the body opening, stretching the body opening; Equipped with 10. The absorbent article according to any one of claims 1 to 9.

11. An outer layer sheet that forms an outer surface of the absorbent article, When the absorbent article is viewed in plan, The back end of the absorbent body is located inside the longitudinal end of the outer sheet, A portion of the second stretchable portion overlaps the absorbent body. The absorbent article of claim 10.

12. a widthwise length of an overlapping portion of the absorbent body that overlaps with the second elastic portion is shorter than a widthwise length of a portion of the absorbent body on a crotch side of the overlapping portion; 12. The absorbent article according to claim 10 or 11.

13. When the absorbent article is viewed in a plan view, an end portion in the width direction of the first stretchable member overlaps with the absorbent body and is directly or indirectly bonded to the absorbent body.

13. The absorbent article according to any one of claims 1 to 12.

14. The pair of grooves penetrate the absorbent body in a thickness direction.

14. The absorbent article according to any one of claims 1 to 13.

15. The pair of grooves are formed so as to become gradually shallower toward both ends in the longitudinal direction.

15. The absorbent article according to any one of claims 1 to 14.

16. The absorbent body has another groove formed between the pair of grooves and extending in the longitudinal direction.

16. The absorbent article according to any one of claims 1 to 15.

17. The pair of grooves are disposed on the crotch side of the urethral opening corresponding area.

17. The absorbent article according to any one of claims 1 to 16.

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