CN114948445B

CN114948445B - Absorbent article

Info

Publication number: CN114948445B
Application number: CN202210113583.3A
Authority: CN
Inventors: 黑原健志; 吉田英聪
Original assignee: Oji Holdings Corp
Current assignee: Oji Holdings Corp
Priority date: 2021-02-26
Filing date: 2022-01-30
Publication date: 2024-03-12
Anticipated expiration: 2042-01-30
Also published as: CN114948445A; CN217286317U

Abstract

An absorbent article having a length along a longitudinal direction and a width along a width direction orthogonal to the longitudinal direction, the absorbent article comprising: an absorber; a liquid-permeable 1 st sheet which is disposed closer to the wearer than the absorber, is in contact with the skin of the wearer, and contains a pH adjusting component; and a liquid-permeable 2 nd sheet disposed between the 1 st sheet and the absorbent body, wherein the flat other sheet is supported at a plurality of positions by protruding portions protruding toward the other sheet in one of the 1 st sheet and the 2 nd sheet at intervals, so that a space is formed between the 1 st sheet and the 2 nd sheet.

Description

Absorbent article

Technical Field

The present disclosure relates to absorbent articles.

Background

Among absorbent articles such as disposable diapers, diaper pads, and physiological products, there are absorbent articles that impart weak acidity to a sheet that contacts the skin of a wearer (for example, refer to japanese patent application laid-open No. 2019-97660). Thus, after urination by the wearer, the pH adjusting component of the sheet can neutralize the alkali component such as ammonia contained in the urine. Therefore, the skin of the wearer can be maintained neutral from weak acidity, and the occurrence of skin problems can be suppressed.

In addition, there are absorbent articles such as disposable diapers, diaper pads, and sanitary articles, for example, in which a urine detector is provided between an absorber and a cover sheet forming an outer surface. The urine detection body is formed by applying a hot-melt adhesive containing a pH indicator to a sheet, and changes its color by reacting with the moisture and pH of urine, so that the urine detection body can notify others of urination of the wearer (see, for example, japanese patent application laid-open nos. 2001-327532 and 2003-190209).

Disclosure of Invention

However, when a sheet that contacts the skin of the wearer is in a state of being wetted with a liquid excreted from the wearer, such as urine, the sheet may not exhibit the weakly acidic property due to being covered with the liquid.

In view of the foregoing background, the present application discloses novel absorbent articles.

In order to solve the above problems, in the present invention, a flat other sheet is supported at a plurality of positions by protruding portions protruding toward the other sheet in one of the 1 st sheet and the 2 nd sheet at intervals, so that a space is formed between the 1 st sheet and the 2 nd sheet.

In detail, a first aspect of the present invention relates to an absorbent article having a length along a longitudinal direction and a width along a width direction orthogonal to the longitudinal direction. The absorbent article is provided with: an absorber; a liquid-permeable 1 st sheet which is disposed closer to the wearer than the absorber, is in contact with the skin of the wearer, and contains a pH adjusting component; and a liquid-permeable 2 nd sheet disposed between the 1 st sheet and the absorbent body, wherein the flat other sheet is supported at a plurality of positions by protruding portions protruding toward the other sheet in one of the 1 st sheet and the 2 nd sheet at intervals, so that a space is formed between the 1 st sheet and the 2 nd sheet.

In the absorbent article according to the above aspect, one of the sheets may have a larger sheet area than the other sheet, and the one sheet may be joined to the other sheet at a plurality of positions with a space therebetween.

In this case, in the absorbent article according to the above aspect, one of the sheets may be the 1 st sheet and the other sheet may be the 2 nd sheet.

In the absorbent article according to the above aspect, the absorbent body may have a pair of grooves extending in the longitudinal direction.

In the absorbent article according to the above aspect, the absorbent article may further include a 1 st stretchable portion having a 1 st stretchable member disposed in an elongated state on the outer side in the width direction of the abdomen-side end portions of the pair of grooves and stretchable in the width direction.

In the absorbent article according to the above aspect, the pair of grooves may be disposed on the crotch side of the region corresponding to the urethral orifice.

In this case, the absorbent article according to the above aspect may be used for infants and infants having a weight in a range of from 5kg to 13kg, in which the length of the abdomen-side end portions of the pair of grooves from the center in the longitudinal direction is in a range of from 90mm to 100mm when the longitudinal end portions are overlapped with each other and folded in half.

In the absorbent article according to the above aspect, when the longitudinal ends are overlapped and folded in half, the length of the abdomen-side ends of the pair of grooves from the center in the longitudinal direction may be in the range of 85mm to 95mm, and the absorbent article may be used for infants having a weight in the range of 8kg to 15 kg.

In the absorbent article according to the above aspect, when the longitudinal ends are overlapped and folded in half, the length of the abdomen-side ends of the pair of grooves from the center in the longitudinal direction may be in the range of 110mm to 120mm, and the absorbent article may be used for infants having a weight in the range of 11kg to 23 kg.

In the absorbent article according to the above aspect, when the longitudinal ends are overlapped and folded in half, the length of the abdomen-side ends of the pair of grooves from the center in the longitudinal direction may be in the range of 100mm or more and 110mm or less, and the absorbent article may be used for infants having a weight in the range of 12kg or more and 29kg or less.

In the absorbent article according to the above aspect, the 1 st stretchable portion may further include a 2 nd stretchable member disposed in an elongated state on an outer side of the rear side end portions of the pair of grooves in the width direction.

In the absorbent article according to the above aspect, the pair of grooves may be disposed on the crotch side of the anus-corresponding region.

In the absorbent article according to the above aspect, when the longitudinal ends are folded in half by overlapping them, the length of the back ends of the pair of grooves from the center in the longitudinal direction may be in a range of 40mm to 50mm, and the absorbent article may be used for infants having a weight in a range of 5kg to 13 kg.

In the absorbent article according to the above aspect, when the longitudinal ends are overlapped and folded in half, the length of the back ends of the pair of grooves from the center in the longitudinal direction may be in a range of 65mm to 75mm, and the absorbent article may be used for infants having a weight in a range of 8kg to 15 kg.

In the absorbent article according to the above aspect, when the longitudinal ends are folded in half by overlapping them, the length of the back ends of the pair of grooves from the center in the longitudinal direction may be in a range of 40mm to 50mm, and the absorbent article may be used for infants having a weight in a range of 11kg to 23 kg.

In the absorbent article according to the above aspect, when the longitudinal ends are folded in half by overlapping them, the length of the back ends of the pair of grooves from the center in the longitudinal direction may be in a range of 50mm to 60mm, and the absorbent article may be used for infants having a weight in a range of 12kg to 29 kg.

In the absorbent article according to the above aspect, the distance between the center lines of the pair of grooves may be 20mm or more and 50mm or less.

In the absorbent article according to the above aspect, the pair of grooves may penetrate the absorbent body in the thickness direction.

In the absorbent article according to the above aspect, the pair of grooves may be at least one of concave grooves provided on the surface of the wearer on the skin surface side of the absorbent body and recessed toward the side opposite to the skin surface side, and concave grooves provided on the surface of the absorbent body on the side opposite to the skin surface side and recessed toward the skin surface side.

In the absorbent article according to the above aspect, the absorber may have a through hole penetrating in the thickness direction of the absorber.

In the absorbent article according to the above aspect, the through hole may be provided in at least one of the area corresponding to the urethral orifice and the periphery of the area corresponding to the urethral orifice.

In the absorbent article according to the above aspect, the absorbent article may further include a urine detector, the urine detector may be disposed on a side opposite to the skin surface side of the wearer from the absorber, and the pair of grooves may be disposed so as to sandwich a portion of the absorber corresponding to the urine detector from both sides in the width direction of the absorber.

A second aspect of the present invention relates to an absorbent article having a length along a longitudinal direction and a width along a width direction orthogonal to the longitudinal direction. The absorbent article is provided with: an absorber; and a liquid-permeable sheet that is disposed closer to the wearer than the absorber and that is in contact with the skin of the wearer, and that contains a pH adjusting component, wherein the absorber has a through hole that penetrates in the thickness direction of the absorber.

In the absorbent article according to the above aspect, the through hole may be provided in at least one of a region corresponding to the urethral orifice and a periphery of the region corresponding to the urethral orifice.

In the absorbent article according to the above aspect, when the longitudinal ends are folded in half by overlapping the longitudinal ends, the length of the abdomen-side ends of the pair of grooves from the center in the longitudinal direction may be in a range of 90mm or more and 100mm or less, and the absorbent article may be used for infants having a weight in a range of 5kg or more and 13kg or less.

In the absorbent article according to the above aspect, when the longitudinal ends are folded in half by overlapping the longitudinal ends, the length of the abdomen-side ends of the pair of grooves from the center in the longitudinal direction may be in a range of 85mm to 95mm, and the absorbent article may be used for infants having a weight in a range of 8kg to 15 kg.

In the absorbent article according to the above aspect, when the longitudinal ends are folded in half by overlapping the longitudinal ends, the length of the abdomen-side ends of the pair of grooves from the center in the longitudinal direction may be in a range of 110mm to 120mm, and the absorbent article may be used for infants having a weight in a range of 11kg to 23 kg.

In the absorbent article according to the above aspect, when the longitudinal ends are folded in half by overlapping the longitudinal ends, the length of the abdomen-side ends of the pair of grooves from the center in the longitudinal direction may be in a range of 100mm to 110mm, and the absorbent article may be used for infants having a weight in a range of 12kg to 29 kg.

In the absorbent article according to the above aspect, the pair of grooves may be the through-holes.

In the absorbent article according to the above aspect, the pair of grooves may be at least one of a concave groove provided on a surface of the absorber on the skin surface side of the wearer and recessed toward the side opposite to the skin surface side, and a concave groove provided on a surface of the absorber on the side opposite to the skin surface side and recessed toward the skin surface side.

A third aspect of the present invention relates to an absorbent article having a length along a longitudinal direction and a width along a width direction orthogonal to the longitudinal direction. The absorbent article is provided with: an absorber; a liquid-permeable sheet disposed closer to the wearer than the absorber and in contact with the skin of the wearer; a urine detector disposed on a side opposite to the skin surface side of the wearer from the absorber; and a pair of grooves provided in the absorber along a longitudinal direction of the absorber and disposed so as to sandwich a portion of the absorber corresponding to the urine detector from both sides in a width direction of the absorber, the pair of grooves being configured to control movement of a liquid.

According to the above, a novel absorbent article can be provided.

Drawings

Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals denote like elements, and in which:

fig. 1 is a perspective view of an underpants type disposable diaper according to the embodiment.

Fig. 2 is an exploded perspective view of the diaper of the embodiment.

Fig. 3A and 3B are diagrams schematically showing a state in which the diaper of embodiment 1 is developed and extended, fig. 3A schematically showing an internal configuration when the developed and extended diaper is viewed from the left side, and fig. 3B schematically showing a plan view of the developed and extended diaper.

Fig. 4A is a plan view of the 1 st example of the top sheet seen from the skin surface side, and fig. 4B is a cross-sectional view of the 1 st example of the top sheet shown in fig. 4A taken along line A-A.

Fig. 5A is a plan view of the 2 nd example of the top sheet seen from the skin surface side, and fig. 5B is a cross-sectional view of the 2 nd example of the top sheet shown in fig. 5A taken along line B-B.

Fig. 6A is a diagram illustrating the flow of liquid from the absorber in the case of the 1 st example using the top sheet shown in fig. 4A and 4B, and fig. 6B is a diagram illustrating the flow of liquid from the absorber in the case of the 2 nd example using the top sheet shown in fig. 5A and 5B.

Fig. 7 is a diagram illustrating the flow of urine discharged by the wearer in the diaper according to embodiment 1.

Fig. 8 is a longitudinal cross-sectional view of an absorbent body in the case where only the absorbent body is extracted from the diaper according to modification 1 of embodiment 1 and is cut by a cross-section including grooves.

Fig. 9A and 9B are diagrams schematically showing a state in which the diaper according to modification 2 of embodiment 1 is developed and extended, fig. 9A schematically showing an internal structure when the developed and extended diaper is viewed from the left side, and fig. 9B schematically showing a plan view of the developed and extended diaper.

Fig. 10A and 10B are diagrams schematically showing a state in which the diaper of embodiment 2 is developed and extended, fig. 10A schematically showing an internal configuration when the developed and extended diaper is viewed from the left side, and fig. 10B schematically showing a plan view of the developed and extended diaper.

Fig. 11 is a diagram illustrating the flow of urine discharged by the wearer in the diaper of embodiment 2.

Fig. 12A and 12B are diagrams schematically showing a state in which the diaper of modification 1 of embodiment 2 is developed and extended, fig. 12A schematically showing an internal structure when the developed and extended diaper is viewed from the left side, and fig. 12B schematically showing a plan view of the developed and extended diaper.

Fig. 13 is a plan view of the diaper according to modification 2 of embodiment 2, in which only the absorber is extracted and the absorber is viewed from the non-skin surface side.

Fig. 14 is a diagram illustrating the flow of urine discharged by the wearer in the diaper according to modification 2 of embodiment 2.

Fig. 15A and 15B are diagrams schematically showing a state in which the diaper of embodiment 5 is developed and extended, fig. 15A schematically showing an internal configuration when the developed and extended diaper is viewed from the left side, and fig. 15B schematically showing a plan view of the developed and extended diaper.

Fig. 16 is a plan view of the indicator as seen from the skin side.

Fig. 17 is a diagram illustrating the flow of sweat of the wearer in the skin-side surface of the absorber.

Detailed Description

Hereinafter, embodiments of the present invention will be described. The embodiments described below are examples of embodiments of the present invention, and the technical scope of the present invention is not limited to the following embodiments.

< embodiment 1 >

Fig. 1 is a perspective view of an underpants type disposable diaper (hereinafter, simply referred to as "diaper") according to the embodiment. The term "direction" used herein refers to a direction that coincides with the front, rear, left, and right of a wearer in a state where the diaper 1 is worn on the wearer (hereinafter, simply referred to as "wearing state"). For example, the term "right-left direction" in the present application refers to a direction that coincides with the right-left direction of the wearer in the wearing state of the diaper 1.

In the present embodiment, as an example of the absorbent article, a pants-type disposable diaper having a tubular structure with an opening into which the abdominal region of the wearer enters and a pair of left and right openings through which the left and right lower limbs of the wearer are inserted is exemplified, but the "absorbent article" in the present application is not limited to pants-type disposable diapers. The term "absorbent article" as used herein includes, for example, various types of absorbent articles capable of wrapping the abdomen and crotch by attaching a tape fixed near one end of a sheet-like member covering the crotch (pudendum) of a wearer from the front to the back to the vicinity of the other end of the sheet-like member to form a tubular structure, such as a tape-like disposable diaper.

In the diaper 1, the direction in which the front body is connected to the back body in the worn state is referred to as the longitudinal direction. In the wearing state of the diaper 1, the side facing the skin of the wearer (the inner side in the wearing state) is the skin surface side, and the opposite side to the skin surface side (the outer side in the wearing state) is the non-skin surface side. The direction connecting the skin surface side and the non-skin surface side is referred to as the thickness direction, and the direction perpendicular to both the longitudinal direction and the thickness direction is referred to as the width direction. The case of viewing from the thickness direction is referred to as planar view.

The diaper 1 has: a crotch region 1B, wherein the crotch region 1B is a region corresponding to a crotch region that covers a crotch (pudendum) of a wearer in a worn state; a front body region 1F, the front body region 1F being a portion corresponding to a front body at a waist circumference (japanese: trunk Zhou) of a wearer and covering an abdomen side of the wearer; and a back body region 1R, the back body region 1R being a portion corresponding to the back body at the waistline of the wearer and covering the back side of the wearer. Here, the front body region 1F is located on the front side of the crotch region 1B, and the rear body region 1R is located on the rear side of the crotch region 1B. Since the diaper 1 of the present 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. Therefore, in the diaper 1, a trunk opening (japanese: open mouth) 2T is formed by the upper edge of the front body region 1F and the upper edge of the rear body region 1R. In the diaper 1, a left leg opening 2L is formed in a left portion of the crotch region 1B where the above-described joining is not performed, and a right leg opening 2R is formed in a right portion of the crotch region 1B. When the diaper 1 is worn with the left lower limb of the wearer inserted through the left lower limb opening 2L, the right lower limb of the wearer inserted through the right lower limb opening 2R, and the trunk portion of the wearer entering the trunk opening 2T, the front body region 1F is disposed on the abdomen side of the wearer, the rear body region 1R is disposed on the back side of the wearer, and the left lower limb opening 2L and the right lower limb opening 2R are fixed to the body of the wearer in a state surrounding the thigh portion of the wearer. Since the diaper 1 is fixed to the body of the wearer in this manner, the wearer can stand and walk while wearing the diaper 1.

In the diaper 1, an absorber capable of absorbing and retaining liquid is mainly disposed around the crotch region 1B. In the diaper 1, in order to suppress formation of a gap which is a flow-out path of liquid between the diaper 1 and the skin of the wearer, a three-dimensional gather 3BL is provided in the left leg opening 2L surrounding the thigh of the left leg of the wearer, a three-dimensional gather 3BR is provided in the right leg opening 2R surrounding the thigh of the right leg of the wearer, and a waist gather 3R is provided in a portion surrounding the abdomen of the wearer. Further, an abdominal gather (i.e., a tattooing unit) 3T (an example of a "1 st stretchable portion" in the present application) is formed on the crotch region 1B side of the waist gather 3R. The three-dimensional gathers 3BL, 3BR, the waist gather 3R, and the abdomen gather are brought into close contact with the skin of the wearer by the elastic force of the elastic member. Therefore, the excreta liquid discharged from the pudendum of the wearer hardly leaks out of the diaper 1 and is absorbed by the absorber of the diaper 1. As the elastic member, a linear or belt-like rubber or the like can be appropriately selected, and a linear rubber (linear rubber) is used in the present embodiment.

Fig. 2 is an exploded perspective view of the diaper 1 of the embodiment. Fig. 3A and 3B are diagrams schematically showing a state in which the diaper 1 according to embodiment 1 is developed and extended. Fig. 3A schematically shows the internal configuration of the diaper 1 in an unfolded and extended state when viewed from the left side. Fig. 3B schematically shows a plan view of the diaper 1 in an unfolded and extended state.

The diaper 1 has cover sheets 4F, 4R and a pad cover sheet (english: pad cover sheet) 6 forming outer surfaces in a worn state. The cover sheet 4F mainly forms the outer surface of the front body region 1F of the diaper 1. In addition, the cushion cover 6 mainly forms the outer surface of the crotch region 1B of the diaper 1. In addition, the cover sheet 4R mainly forms the outer surface of the rear body region 1R of the diaper 1. The cover sheets 4F and 4R and the pad cover sheet 6 are provided to enhance the reinforcing and feel of the outer surface of the diaper 1, and for example, nonwoven fabrics made of a liquid impermeable thermoplastic resin may be used as the material thereof to suppress leakage of excrement. Here, examples of the liquid-impermeable thermoplastic resin include Polyethylene (PE) and polypropylene (PP). In addition, in the liquid-impermeable sheet, a plurality of fine holes of about 0.1 to several μm may be formed in order to exhibit liquid impermeability and moisture permeability. In order to improve the ventilation at the waist, the cover sheets 4F, 4R may be formed with a plurality of holes partially or entirely.

The diaper 1 has an inner cover sheet 5F laminated on the skin surface side of the cover sheet 4F and an inner cover sheet 5R laminated on the skin surface side of the cover sheet 4R. The inner cover sheet 5F is a sheet-like member having a shape corresponding to a portion of the cover sheet 4F on the crotch region 1B side of a linear eyelet (japanese: chemical) 4F6 described later. The inner cover sheet 5R is also a sheet-like member having a shape corresponding to a portion of the inner cover sheet 5R closer to the crotch region 1B than the linear perforations 4R6 described later, similarly to the inner cover sheet 5F.

The diaper 1 further includes a back sheet 7, an absorber 8, and a top sheet 9 laminated in this order on the skin surface side of the pad cover sheet 6. The cushion cover sheet 6 is a substantially rectangular parallelepiped sheet having a length extending from the front body to the rear body of the wearer through the crotch in the longitudinal direction and a predetermined width in the width direction orthogonal to the longitudinal direction. The back sheet 7, the absorber 8, and the top sheet 9 are sheet-like members having a substantially rectangular appearance like the cushion cover sheet 6, and are sequentially laminated on the cushion cover sheet 6 in a state where the longitudinal direction coincides with the longitudinal direction of the cushion cover sheet 6. The longitudinal direction of the back sheet 7, the absorbent body 8, and the top sheet 9 coincides with the longitudinal direction of the diaper 1, and the width direction of the back sheet 7, the absorbent body 8, and the top sheet 9 coincides with the width direction of the diaper 1.

The back sheet 7 is a sheet made of a liquid impermeable thermoplastic resin for suppressing leakage of excrement. The top sheet 9 is a sheet-like member disposed on the skin surface side of the wearer so as to cover the water absorbing surface of the absorber 8. Part or all of the top sheet 9 has liquid permeability. Therefore, in the wearing state of the diaper 1, liquid excreted from the wearer is absorbed by the absorbent body 8 through the top sheet 9 which can be brought into contact with the skin of the wearer. Examples of the liquid-permeable sheet include woven fabrics, nonwoven fabrics, and porous films. In addition, the top sheet 9 may have hydrophilicity.

In addition, the top sheet 9 has a multilayer structure. Fig. 4A is a plan view of the 1 st example of the top sheet 9 as seen from the skin surface side, and fig. 4B is a cross-sectional view of the 1 st example of the top sheet 9 shown in fig. 4A taken along line A-A. Fig. 5A is a plan view of the 2 nd example of the top sheet 9 as seen from the skin surface side, and fig. 5B is a cross-sectional view of the 2 nd example of the top sheet 9 shown in fig. 5A taken along line B-B.

As shown in fig. 4A and 4B and fig. 5A and 5B, the top sheet 9 has an outer top sheet 9A and an inner top sheet 9B. The outer topsheet 9A (an example of the "1 st sheet" in the present application) is a liquid-permeable sheet that comes into contact with the skin of the wearer, and the inner topsheet 9B (an example of the "2 nd sheet" in the present application) is a liquid-permeable sheet that is disposed between the outer topsheet 9A and the absorber 8. The inner topsheet 9B has neutral properties. On the other hand, the outer topsheet 9A contains a pH adjusting component and has weakly acidic properties. As the pH adjusting component, an organic acid, for example, malic acid or citric acid which is highly safe and substantially odorless in the state before use of the diaper 1 is used. The outer top sheet 9A is produced by applying a chemical solution containing an organic acid to a neutral sheet such as the inner top sheet 9B.

In example 1 of the top sheet 9, as shown in fig. 4A and 4B, the outer top sheet 9A has a larger sheet area than the inner top sheet 9B, and the surface of the inner top sheet 9B on the skin surface side is welded in a wavy line shape extending in the longitudinal direction of the diaper 1 by heat welding or ultrasonic welding. The outer top sheet 9A is welded to the inner top sheet 9B at a plurality of locations at intervals in the width direction of the diaper 1. Thus, the flat inner top sheet 9B is supported at a plurality of positions with intervals in the width direction by the protruding portions (welded portions WL) of the outer top sheet 9A protruding toward the inner top sheet 9B, and a space is formed between the outer top sheet 9A and the inner top sheet 9B. As a result, when the top sheet 9 is viewed from the skin surface side, the outer top sheet 9A is formed with a pattern formed by embossing by the welded portion WL of the outer top sheet 9A and a portion other than the welded portion WL.

In example 2 of the top sheet 9, as shown in fig. 5A and 5B, the inner top sheet 9B has a larger sheet area than the outer top sheet 9A, and the surface of the outer top sheet 9A on the non-skin side is welded in a wavy line shape extending in the longitudinal direction of the diaper 1 by heat welding or ultrasonic welding. The inner top sheet 9B is welded to the outer top sheet 9A at a plurality of locations with intervals in the width direction. Thus, the flat outer topsheet 9A is supported at a plurality of positions with intervals in the width direction by the protruding portions (welded portions WL) of the inner topsheet 9B protruding toward the outer topsheet 9A, and a space is formed between the outer topsheet 9A and the inner topsheet 9B. As a result, when the top sheet 9 is viewed from the skin surface side, as shown by a broken line in fig. 5A, a pattern formed by the welded portion WL of the inner top sheet 9B and a portion other than the welded portion WL is formed in the inner top sheet 9B.

In the multilayer construction of these topsheets 9, the skin feel becomes soft due to the space formed between the outer topsheet 9A and the inner topsheet 9B. In the multilayer structure of the top sheet 9 shown in fig. 4A and 4B, a portion (convex portion) of the outer top sheet 9A protruding toward the skin surface side is formed between adjacent welded portions WL, and the convex portions are arranged adjacently, so that when the skin of the wearer comes into contact with the outer top sheet 9A, a space can be formed between the skin and the adjacent convex portions (see fig. 6A). Thus, the outer topsheet 9A is easily dried, and even if the skin of the wearer contacts the outer topsheet 9A, the outer topsheet 9A is easily maintained in a dry state.

In the multilayer structure of the top sheet 9 described above, not only the outer top sheet 9A but also the inner top sheet 9B may be slightly acidic. The extending direction of the welded portion WL is not limited to the longitudinal direction of the diaper 1. For example, the extension direction of the welded portion WL may be the width direction of the diaper 1, or may be both the longitudinal direction and the width direction. The shape of the welded portion WL is not limited to a wavy line shape formed by a curved line. For example, the shape of the welded portion WL may be a broken line formed by a straight line. The shape of the welded portion WL is not limited to a linear shape, as long as a space is formed between the outer topsheet 9A and the inner topsheet 9B. For example, the welded portion WL may be dot-shaped. The joining of the outer topsheet 9A and the inner topsheet 9B is not limited to thermal fusion or ultrasonic fusion. For example, the bonding of the sheets 9A and 9B may be bonding using a hot melt adhesive.

The absorber 8 has a structure in which a particulate absorbent resin such as a hydrophilic superabsorbent polymer having a crosslinked structure capable of absorbing and retaining water is retained in the interstices of a short fiber of cellulose fibers such as pulp fibers, rayon fibers, or cotton fibers, or a short fiber obtained by hydrophilizing a synthetic fiber such as polyethylene, polypropylene, or polyethylene terephthalate. Therefore, when the absorbent body 8 absorbs liquid excreted from the wearer, the absorbent resin in the gaps held in the short fibers is swelled to hold the liquid in the short fibers. The absorber 8 may have a single-layer structure composed of 1 mat (english: mat), or may have a laminated structure in which a plurality of mats are stacked. The absorber 8 can take an appropriate shape according to the purpose. Examples of the shape of the absorber 8 include rectangular, hourglass-shaped with a narrowed central portion, and various other shapes.

The back sheet 7, the absorber 8, and the top sheet 9 all extend from the front body region 1F to the back body region 1R. Therefore, when the pudendum (crotch) of the wearer is covered with the pad cover sheet 6 in which the back sheet 7, the absorber 8, and the top sheet 9 are laminated, both ends in the longitudinal direction of each of the back sheet 7, the absorber 8, and the top sheet 9 are positioned on the abdomen side and the back side of the wearer. That is, the pudendum of the wearer is covered with the absorber 8 from the abdomen side to the back side of the wearer. Therefore, the discharged liquid is in contact with the absorber 8 via the top sheet 9 regardless of whether the wearer discharges the liquid to the outside in any one of the abdomen-down posture and the back-down posture.

The diaper 1 has elongated belt-shaped side panels 10L and 10R for forming the above-described three-dimensional gathers 3BL and 3BR. The side sheets 10L and 10R are provided on the long side of the top sheet 9. The linear rubbers 10L1 and 10R1 are bonded to the side sheets 10L and 10R in the longitudinal direction. Therefore, when the edge 4F7 of the cover sheet 4F that is the left edge of the front body region 1F and the edge 4R7 of the cover sheet 4R that is the left edge of the rear body region 1R are joined to each other, and the edge 4F8 of the cover sheet 4F that is the right edge of the front body region 1F and the edge 4R8 of the cover sheet 4R that is the right edge of the rear body region 1R are joined to each other, the side sheets 10L and 10R are pulled up from the top sheet 9 in the longitudinal direction by the contraction force of the linear rubbers 10L1 and 10R1, and the side sheets 10L and 10R stand up along the folding lines 10L2 and 10R2, respectively, in the finished state of the diaper 1 shown in fig. 1. As a result, three-dimensional gathers 3BL, 3BR are formed which prevent liquid from flowing out of the left and right lower limb openings 2L, 2R. The joining method of the edge 4F7 of the cover sheet 4F and the edge 4R7 of the cover sheet 4R, and the edge 4F8 of the cover sheet 4F and the edge 4R8 of the cover sheet 4R is not particularly limited, and can be performed by, for example, heat sealing, high-frequency sealing, ultrasonic sealing, or the like.

Further, the diaper 1 has: an air passage forming sheet 11F laminated on the skin surface side of the cover sheet 4F with the cushion cover sheet 6, the back sheet 7, the absorber 8, the top sheet 9, the side sheets 10L, 10R interposed therebetween, and an air passage forming sheet 11R laminated on the skin surface side of the cover sheet 4R. The ventilation path forming sheet 11F overlaps the cover sheet 4F at one end side in the longitudinal direction of the top sheet 9. The ventilation path forming sheet 11R overlaps the cover sheet 4R on the other end side in the longitudinal direction of the top sheet 9. The state in which sheets are overlapped in the present application is not limited to a state in which the overlapped sheets are overlapped in a state of being in contact with each other over the entire surface, and is a concept including a state in which a part of the sheets are overlapped with each other. For example, the ventilation path forming piece 11F overlaps with a part of one end side in the longitudinal direction of the cushion cover piece 6 in contact with a part of the cover piece 4F.

Sheet 11F is formed in the ventilation pathA plurality of ventilation fine ventilation holes 11F1 are arranged in a region extending in the left-right direction along the upper edge of the precursor region 1F. The ventilation hole forming sheet 11R is also provided with a plurality of ventilation holes 11R1 in the same manner as the ventilation hole forming sheet 11F. Here, the vent hole is an opening for communicating a space on one surface side of the sheet with a space on the other surface side, and the shape thereof is not particularly limited. Accordingly, for example, openings having a circular shape, an elliptical shape, a polygonal shape (triangle, quadrangle, etc.) or the like can be applied as the ventilation holes 11F1, 11R1. The formation of the ventilation holes 11F1, 11R1 into the ventilation path formation sheets 11F, 11R does not mean that the ventilation path formation sheets 11F, 11R are materials having no ventilation, and the ventilation path formation sheets 11F, 11R may be any of materials having ventilation and materials having no ventilation. The ventilation path forming sheets 11F and 11R are preferably made of a material having ventilation property and liquid permeability, but may be made of a material having non-ventilation property, for example. The size and number of the ventilation holes 11F1, 11R1 are not particularly limited, and for example, if the opening area is 0.5 to 10mm ² Preferably, about 5 to 200 holes are formed.

As described above, the diaper 1 has the cover sheets 4F and 4R, the ventilation path forming sheets 11F and 11R, the cushion cover sheet 6, and the side sheets 10L and 10R laminated in addition to the back sheet 7 and the top sheet 9 sandwiching the absorber 8, and thus can be said to have a laminate in which the above-described plurality of sheets are laminated.

Here, as shown in fig. 3A and 3B, one end side of the cover piece 4F is folded back at the linear eyelet 4F 6. The linear hole 4F6 is formed by arranging vent holes formed by fine slits cut into the cover piece 4F in a straight line along the edge of the trunk opening 2T in a broken line. The dotted vent hole forming the linear hole 4F6 is of a size that the wearer's finger cannot enter. For example, if the vent hole is formed by a slit having a length of 5mm or less, a finger of a typical infant cannot be moved. The linear hole 4F6 is formed with a predetermined distance between slits forming a virtual line of ventilation holes so that the cover sheet 4F is not cut out with the linear hole 4F6 as a boundary in accordance with a normal use state of the diaper 1. Although also depending on the strength of the material constituting the cover sheet 4F, if it is not damagedThe required stretchability and the gram weight (Japanese basis weight) of wearing feeling of the waist-surrounding is 8-50 g/m ² The distance between the slits is preferably 2mm or more.

The above-described waist gather 3R is formed by bonding the linear rubbers 4F2 and 4F3 to the cover sheet 4F in an elongated state and bonding the linear rubbers 4R2 and 4R3 to the cover sheet 4R in an elongated state. The linear rubbers 4F2, 4F3 adhered to the cover sheet 4F are provided in the order of the linear rubbers 4F2, 4F3 from the linear eyelet 4F6 side along the linear eyelet 4F6 forming the upper edge of the precursor area 1F when folded back. The linear rubbers 4R2 and 4R3 bonded to the cover sheet 4R are also provided in the order of the linear rubbers 4R2 and 4R3 from the side of the linear eyelet 4R6 along the linear eyelet 4R6 forming the upper edge of the rear body region 1R at the time of folding back, similarly to the linear rubbers 4F2 and 4F 3. Therefore, the linear rubbers 4F2, 4F3 are provided on the cover sheet 4F in such an orientation that the waistline direction, which is the extension and contraction direction, is the width direction (left-right direction) of the diaper 1. The linear rubbers 4R2 and 4R3 are provided on the cover sheet 4R in such an orientation that the longitudinal direction, which is the expansion and contraction 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 to each other and the edge 4F8 and the edge 4R8 (see fig. 2) are joined to each other, the linear rubbers 4F2, 4F3 and the linear rubbers 4R2, 4R3 form a substantially annular stretchable member surrounding along the trunk opening 2T, and function to shrink the trunk opening 2T in the waistline direction. That is, the linear rubbers 4F2 and 4F3 and the linear rubbers 4R2 and 4R3 exert contraction force to bring the diaper 1 into close contact with the wearer, thereby preventing a gap from being formed between the diaper 1 and the abdominal circumference of the wearer. The linear rubbers 4F2 and 4F3 and the linear rubbers 4R2 and 4R3 are adhered to the cover sheets 4F and 4R discretely by an adhesive agent applied discretely in the longitudinal direction of the linear rubbers. The adhesive for bonding the linear rubbers 4F2, 4F3, 4R2, 4R3 to the cover sheets 4F, 4R may be applied to the linear rubbers 4F2, 4F3, 4R2, 4R3 or may be applied to the cover sheets 4F, 4R. The linear rubbers 4F2, 4F3, 4R2, and 4R3 may be bonded to the cover sheets 4F and 4R by ultrasonic welding instead of the adhesive. Further, since the slit of the linear hole 4F6 is a length through which the finger of the wearer does not pass, the fingertip does not come into contact with the linear rubbers 4F2, 4F3, and the like, and the linear rubbers are cut.

The linear rubbers 4F4 and 4F5 (an example of the "1 st stretchable member" in the present application) are bonded to the cover sheet 4F in an elongated state, and the linear rubbers 4R4 and 4R5 are bonded to the cover sheet 4R in an elongated state. The linear rubbers 4F4 and 4F5 are stretchable members provided in the cover sheet 4F in the crotch region 1B side of the linear rubber 4F 3. In the diaper 1, the linear rubbers 4F4, 4F5, 4R4, and 4R5 form the abdominal gathers 3T on the crotch region 1B side of the waist gathers 3R. However, unlike the linear rubbers 4F2, 4F3 extending from the left end to the right end of the cover piece 4F, the linear rubbers 4F4, 4F5 are cut out by a predetermined width at the widthwise central portion. Since the cover sheet 4F has the linear rubbers 4F4, 4F5 whose widthwise central portions are cut out, the swelling due to the water absorption of the absorber 8 is not hindered, and a moderate feeling of close contact is imparted to the lower abdomen of the wearer. In the cover sheet 4R, like the cover sheet 4F, the linear rubbers 4R4, 4R5 having a predetermined width cut out at the widthwise central portion are bonded to the cover sheet 4R, so that a moderate feeling of close contact is imparted to the lower abdomen of the wearer.

As shown in fig. 3B, the absorber 8 has a pair of grooves 8SL and 8SR extending in the longitudinal direction of the diaper 1. The pair of grooves 8SL, 8SR penetrates the absorber 8 in the thickness direction, and extends around the crotch region 1B. The grooves 8SL and 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 and 8SR are arranged symmetrically with respect to the center of the diaper 1 in the width direction, and are formed parallel to each other. Urine discharged from the wearer is introduced into the pair of grooves 8SL and 8SR, and is spread over the absorbent body 8.

The linear rubbers 4F4, 4F5 are disposed in an elongated state on the outer side in the width direction of the diaper 1 at the end (abdomen-side end) of the front body region 1F side of the pair of grooves 8SL, 8 SR. The diaper 1 of the present embodiment is suitable for infants and young children both in men and women. The region 40 shown by the oval broken line in fig. 3B is a region corresponding to the urethral orifice of the wearer (hereinafter referred to as "urethral orifice corresponding region 40"). The urethral corresponding region 40 is a region that overlaps with a position where the urethral orifice of the wearer abuts against the top sheet 9 in the thickness direction in a normal wearing state of the diaper 1. The urethral orifice corresponding region 40 is disposed on the front body region 1F side of the diaper 1, and the pair of grooves 8SL, 8SR are disposed on the crotch region 1B side of the urethral orifice corresponding region 40. In addition, the urethral-opening corresponding region 40 is adjacent to the ventral portion of the diaper 1. Here, the abdomen-side portion is the front body region 1F side of the waist gather 3R, and is the arrangement region of the linear rubbers 4F2, 4F 3. In other words, the urethral orifice corresponding region 40 is adjacent to the waist gather 3R on the front body region 1F side.

In the wearing state of the diaper 1, the pair of grooves 8SL, 8SR are pressed in the skin surface direction by the linear rubber 4F5 on the outer side in the width direction than the pair of grooves 8SL, 8SR, and the pair of grooves 8SL, 8SR are not pressed in the skin surface direction, so that a space is formed between the top sheet 9 and the skin surface. This is because the force of pulling the diaper 1 outward in the width direction of the linear rubber 4F5 is blocked by the grooves 8SL and 8SR, and the space between the pair of grooves 8SL and 8SR is more likely to be separated from the skin surface than the outer sides of the pair of grooves 8SL and 8SR in the width direction. The diaper 1 can temporarily store urine discharged to the region 40 corresponding to the urethral orifice during wearing in the space. The diaper 1 can gradually guide urine stored in the space to the grooves 8SL and 8SR, and can diffuse the urine along the grooves 8SL and 8SR to the entire absorber 8. Thus, the diaper 1 of the present embodiment can suppress urine leakage by suppressing lateral leakage of urine from the lateral side and abdominal leakage of urine from the abdominal side.

The linear rubber 4R5 (an example of the "2 nd stretchable member" described herein) is disposed in an elongated state on the outer side in the width direction of the diaper 1 at the end (back end) of the pair of grooves 8SL, 8SR on the back region 1R side. The area 30 illustrated by the oval broken line shown in fig. 3B is an anus corresponding area (hereinafter, referred to as "anus corresponding area 30") corresponding to the anus of the wearer. The anus corresponding region 30 is a region overlapping with a position where the anus of the wearer abuts against the top sheet 9 in the thickness direction in a normal wearing state of the diaper 1. The anus-corresponding region 30 is disposed on the rear body region 1R side of the diaper 1, and the pair of grooves 8SL, 8SR are disposed on the crotch region 1B side of the anus-corresponding region 30. In addition, the anus-corresponding region 30 is adjacent to the back side portion of the diaper 1. The back side portion is a rear body region 1R side of the waist gather 3R, and is an arrangement region of the linear rubbers 4R2, 4R 3. In other words, the anus-corresponding region 30 is adjacent to the waist gather 3R on the rear body region 1R side.

In the wearing state of the diaper 1, the pair of grooves 8SL, 8SR are pressed in the skin surface direction by the linear rubber 4R5 on the outer side in the width direction than the pair of grooves 8SL, 8SR, and the pair of grooves 8SL, 8SR are not pressed in the skin surface direction, so that a space is formed between the top sheet 9 and the skin surface. This is because the force of pulling the diaper 1 outward in the width direction of the linear rubber 4R5 is blocked by the grooves 8SL and 8SR, and the space between the pair of grooves 8SL and 8SR is more likely to be separated from the skin surface than the outer sides of the pair of grooves 8SL and 8SR in the width direction. The diaper 1 can hold the feces discharged to the anus corresponding region 30 in this space when worn. Thus, the diaper 1 of the present embodiment can hold feces.

In fig. 3B, the single-dot chain line CL is the center line of the groove 8SL, the single-dot chain line CR is the center line of the groove 8SR, and the interval between the center lines of the grooves 8SL and 8SR is W. The interval W is set to 20mm to 50mm so as to form a space for accumulating urine and/or a space for holding feces in a wearing state in consideration of the body size of an infant. Thereby, a urine storage space and/or a feces holding space corresponding to the infant are formed. Further, since the grooves 8SL, 8SR are provided on the crotch region 1B side of the urethral opening corresponding region 40 and the anus corresponding region 30, the grooves 8SL, 8SR are also difficult to contact with the urethral opening and/or buttocks via the top sheet 9. Thus, the diaper 1 can prevent the meatus and/or buttocks from being irritated by the grooves 8SL, 8SR, and can prevent skin problems in the vicinity of the meatus and/or buttocks from occurring.

It is preferable that the front body region 1F side end portions of the pair of grooves 8SL, 8SR be located closer to the crotch region 1B than the urethral orifice corresponding region 40, and the rear body region 1R side end portions of the pair of grooves 8SL, 8SR be located closer to the crotch region 1B than the anus corresponding region 30 corresponding to the anus of the wearer shown in fig. 3B. The diaper 1 prevents irritation of the urethral opening and/or anus by the grooves 8SL, 8SR, and can prevent skin problems in the vicinity of the urethral opening and/or anus.

Here, the length of the abdomen-side end portions of the pair of grooves 8SL, 8SR from the center in the longitudinal direction when the diaper 1 is folded in half so that the end portions in the longitudinal direction overlap each other is defined. The two-dot chain line FL of fig. 3B is a fold line in the case where the diaper 1 is folded in half so that the longitudinal end portions thereof overlap each other, and indicates the longitudinal center of the diaper 1. When the diaper 1 is folded in half with the two-dot chain line FL, the diaper 1 is suitable for infants and infants having a weight in the range of 5kg to 13kg when the length (L1 in fig. 3B) of the abdomen-side end portions of the pair of grooves 8SL, 8SR from the center in the longitudinal direction of the diaper 1 (two-dot chain line FL) is in the range of 90mm to 100 mm. Further, when the diaper 1 is folded in half with the two-dot chain line FL, the diaper 1 is suitable for infants and children having a weight in a range of 8kg to 15kg when the length (L1) of the abdomen-side end portions of the pair of grooves 8SL, 8SR from the center in the longitudinal direction of the diaper 1 (two-dot chain line FL) is in a range of 85mm to 95 mm. Further, when the diaper 1 is folded in half with the two-dot chain line FL, the diaper 1 is suitable for infants and children having a weight in a range of 11kg to 23kg when the length (L1) of the abdomen-side end portions of the pair of grooves 8SL, 8SR from the center in the longitudinal direction of the diaper 1 (two-dot chain line FL) is in a range of 110mm to 120 mm. Further, when the diaper 1 is folded in half with the two-dot chain line FL, the diaper 1 is suitable for infants and children having a weight in a range of 12kg to 29kg when the length (L1) of the abdomen-side end portions of the pair of grooves 8SL, 8SR from the center in the longitudinal direction of the diaper 1 (two-dot chain line FL) is in a range of 100mm to 110 mm.

It is preferable that a stretchable member (elastic member) such as a linear rubber is not disposed in the urethral orifice corresponding region 40. By not disposing the stretchable member in the urethral orifice corresponding region 40, it is possible to prevent a space for accumulating urine from being obstructed.

The urine storage space is formed by the diaper 1 bulging in a dome shape from a virtual rising line L3, which is shown as a rectangle by a thick broken line in fig. 3B, toward the non-skin surface side. The position of the vertical line L3 will be described below.

The abdominal gathers 3T are formed on both sides in the width direction of the urethral orifice corresponding region 40 and are located on the outer side in the width direction than the extending line of the abdomen side (the front body region 1F side) of the pair of grooves 8SL, 8 SR. The abdominal gather 3T on the front body region 1F side is a region where the linear rubbers 4F4 and 4F5 are arranged, and the linear rubbers 4F4 and 4F5 are arranged on both sides in the width direction of the meatus-corresponding region 40 and on the outer side in the width direction than the extending line of the abdomen side (front body region 1F side) of the pair of grooves 8SL and 8 SR. This is because, in the wearing state of the diaper 1, a space for accumulating urine needs to be formed at least including the region 40 corresponding to the urethral orifice, but if the space is too large, urine may flow out to the region other than the grooves 8SL, 8SR, and therefore, a space of a size capable of accumulating 1 urination amount of an infant needs to be formed. Therefore, in the present embodiment, the widthwise end of the abdominal gather 3T is pressed against the skin surface by the contraction force of the linear rubbers 4F4, 4F5 at the outer side in the width direction than the extension line of the pair of grooves 8SL, 8SR, instead of pressing the urethral orifice corresponding region 40 against the skin surface, whereby the widthwise end of the standing line L3 is defined at the widthwise end of the abdominal gather 3T. This prevents the space from being excessively expanded in the width direction of the diaper 1.

In consideration of the position of the baby's meatus, the length (L2 in fig. 3B) of the meatus-corresponding region 40 in the longitudinal direction of the diaper 1 is preferably 50mm. As shown in fig. 3B, the linear rubbers 4F4 and 4F5 disposed on the outer side in the width direction of the meatus-corresponding region 40 are disposed at a shorter interval than the linear rubbers 4F5 disposed on the outer side in the width direction of the abdomen-side end portions of the pair of grooves 8SL and 8 SR. Therefore, the expansion and contraction force of the abdominal gather 3T on the outer side in the width direction of the urethral orifice corresponding region 40 is larger than the expansion and contraction force on the outer side in the width direction of the abdomen-side end portions of the pair of grooves 8SL, 8 SR. This is because, since the abdomen-side end portions of the grooves 8SL, 8SR define the standing line L3 on the crotch region 1B side where the space is formed, the diaper 1 may be pressed against the skin with a necessary and sufficient force on the outer sides in the width direction of the grooves 8SL, 8SR, but if the outer sides in the width direction of the meatus-corresponding region 40 are expansion and contraction forces of the same extent as or weaker than the outer sides in the width direction of the grooves 8SL, 8SR, the space is expanded in the width direction, and the space in which the size of 1 urination volume of infants can be stored cannot be maintained. In the diaper 1 of the present embodiment, the expansion and contraction force of the abdominal gather 3T on the outer side in the width direction of the urethral orifice corresponding region 40 is made larger than the expansion and contraction force of the pair of grooves 8SL, 8SR on the outer side in the width direction, whereby the space can be prevented from becoming excessively large, and the space for accumulating urine can be maintained appropriately.

Further, a waist gather 3R is provided on the abdomen side of the urethral orifice corresponding region 40. The waist gather 3R defines the rising line L3 on the abdomen side of the urine storage space by pressing the diaper 1 against the skin surface. That is, the standing line L3 on the abdomen side of the predetermined space on the crotch region 1B side (the linear rubber 4F3 on the crotch region 1B side) of the waist gather 3R. The diaper 1 of the present embodiment can prevent the space from becoming excessively large toward the abdomen side by the waist gather 3R, and can appropriately maintain the space for accumulating urine.

As shown in fig. 3B, when the diaper 1 is viewed in plan, the longitudinal end portion of the absorber 8 is positioned inside the abdominal-side end portion (the end portion on the front body region 1F side) of the cushion cover sheet 6, and a part of the linear rubber 4F3 forming the waist gather 3R overlaps with the absorber 8. Thus, the diaper 1 can define the end portion of the waist gather 3R on the crotch region 1B side as the space abdomen-side standing line L3 without using the abdomen-side end portions of the cushion cover sheet 6 and the absorber 8 as the space abdomen-side standing line L3. If the abdomen-side end of the cushion cover 6 and the absorber 8 is used as a physical standing line of the space, the physical standing line may contact the urethral orifice and the skin around the urethral orifice, which may cause a problem such as skin trouble. In contrast, the diaper 1 of the present embodiment can define the virtual standing line L3 on the crotch region 1B side of the waist gather 3R as the abdomen side of the space, and therefore can form a space for accumulating urine, and can prevent the occurrence of skin problems and the like that may occur due to physical standing lines coming into contact with the urethral orifice and the skin around the urethral orifice.

The length in the width direction of the overlapping portion 8A of the absorbent body 8 overlapping the waist gather 3R is shorter than the length in the width direction of the portion 8B on the crotch side of the overlapping portion 8A. Here, the overlapping portion 8A is a portion overlapping the linear rubber 4F3 in the absorber 8, and the crotch portion 8B is a portion closer to the crotch region 1B than the specific gravity portion 8A. By using the absorber 8 having such a shape, the widthwise end of the overlapping portion 8A is contracted inward in the width direction, and a urine storage space is easily formed.

As shown in fig. 3A and 3B, when the diaper 1 is viewed in plan, the widthwise end portions of the linear rubbers 4F4 and 4F5 overlap the absorber 8 and are directly or indirectly bonded to the absorber 8. Here, the direct bonding of the end portion to the absorber 8 means that the end portion is directly bonded to the absorber 8, and the indirect bonding of the end portion to the absorber 8 means that the end portion is bonded to the absorber 8 via the inner cover sheet 5F, the cushion cover sheet 6, and the back sheet 7. In the present embodiment, the end portion is indirectly bonded to the absorber 8. If the linear rubbers 4F4 and 4F5 are provided on the outer side in the width direction than the absorber 8, the absorber 8 and the linear rubbers 4F4 and 4F5 are not directly or indirectly bonded, the expansion and contraction force generated by the linear rubbers 4F4 and 4F5 will be exerted on the outer side in the width direction than the absorber 8, and the expansion and contraction force will not contribute to the formation of a urine storage space. In the diaper 1 of the present embodiment, since the widthwise ends of the linear rubbers 4F4, 4F5 are indirectly bonded to the absorber 8, the expansion and contraction force generated by the linear rubbers 4F4, 4F5 can contribute to the formation of a space. The stretching force generated by the linear rubbers 4F4, 4F5 is exerted by pulling the abdominal gather 3T to the outside in the width direction in the wearing state of the diaper 1 than in the non-wearing state of the diaper 1.

In the diaper 1 of the above embodiment, a weakly acidic sheet is used as the top sheet 9 (outer top sheet 9A) which is in contact with the skin of the wearer. Here, for example, when pressure is applied to the absorber 8 by the action of the wearer, backflow such that the liquid excreted from the wearer held by the absorber 8 is pushed out from the absorber 8 and returned to the skin of the wearer may occur. However, since the top sheet 9 is weakly acidic, even if the back flow occurs, the pH adjusting component of the top sheet 9 can neutralize the alkali component such as ammonia contained in the liquid. Therefore, the skin of the wearer can be maintained neutral from weak acidity, and the occurrence of skin problems can be suppressed.

However, the inventors of the present application found that: when the top sheet 9 is in a state of being wetted with a liquid or the like that flows back, the top sheet 9 may not sufficiently exhibit the weakly acidic property of the top sheet 9 because the top sheet 9 is covered with the liquid.

The inventors of the present application measured the pH of the topsheet 9 (outer topsheet 9A) of the present application, which imparts weakly acidic properties, and the usual topsheets, which did not impart weakly acidic properties. In the measurement of pH, a Phmeter (body: HI99181N, electrode: HI 1414D/50) manufactured by halon was used. The top sheet 9 and the normal top sheet of the present application were placed on a square plate (japanese) of polypropylene (PP), and the numerical values displayed on the body were read when the electrodes were brought into contact with the sheet. At this time, the topsheet 9 of the present application exhibits weak acidity at pH 5.8, for example, and a typical topsheet exhibits neutrality at pH 6.8, for example. In order to confirm whether or not the properties of the sheet were maintained even in a wet state, the top sheet 9 and the normal top sheet of the present application were each wetted with ion-exchanged water, and the pH of each sheet was measured. At this time, both the top sheet 9 and the usual top sheet of the present application showed a pH of 7.0±0.1, that is, the pH of ion-exchanged water. As is clear from this, the pH of the liquid covering the sheet in a wet state has a large influence, and the properties of the sheet cannot be fully exhibited.

Therefore, in the diaper 1 of the present embodiment, the top sheet 9 has a multilayer structure including the outer top sheet 9A and the inner top sheet 9B so that the properties of the sheet can be sufficiently exhibited.

Fig. 6A is a diagram illustrating the flow of liquid from the absorber 8 in the case of the 1 st example of the top sheet 9 shown in fig. 4A and 4B, and fig. 6B is a diagram illustrating the flow of liquid from the absorber 8 in the case of the 2 nd example of the top sheet 9 shown in fig. 5A and 5B. In fig. 6A and 6B, the skin SK of the wearer is also shown in order to more clearly explain the multilayer structure of the top sheet 9.

As described above, in example 1 of the top sheet 9 shown in fig. 4A and 4B, the outer top sheet 9A has a larger sheet area than the inner top sheet 9B, and the outer top sheet 9A is joined to the inner top sheet 9B at a plurality of locations (welded portions WL) with intervals. Thereby, a space is formed between the outer topsheet 9A and the inner topsheet 9B. That is, the portion where the outer topsheet 9A and the inner topsheet 9B are joined is only the welded portion WL. If the outer topsheet 9A has the same sheet area as the inner topsheet 9B, and the outer topsheet 9A is laminated only on the inner topsheet 9B, the area of the portion where the outer topsheet 9A contacts the inner topsheet 9B tends to be large. Further, since the portion where the outer topsheet 9A and the inner topsheet 9B are in contact serves as a flow path for liquid between the outer topsheet 9A and the inner topsheet 9B to flow back, when the area of the portion where the outer topsheet 9A and the inner topsheet 9B are in contact is large, liquid is easily transferred from the inner topsheet 9B to the outer topsheet 9A.

In contrast, in example 1 of the top sheet 9 shown in fig. 4A and 4B, as indicated by the arrows in fig. 6A, only the portion (welded portion WL) where the outer top sheet 9A and the inner top sheet 9B are joined becomes a flow path when the liquid flows back, and therefore, the liquid is difficult to transfer from the inner top sheet 9B to the outer top sheet 9A. Therefore, the outer top sheet 9A can be made less likely to be wetted with the returned liquid.

In example 2 of the top sheet 9 shown in fig. 5A and 5B, the inner top sheet 9B has a larger sheet area than the outer top sheet 9A, and the inner top sheet 9B is joined to the outer top sheet 9A at a plurality of locations (welded portions WL) with intervals. In this example 2 as well, as in example 1, as shown by the arrows in fig. 6B, only the portion (welded portion WL) where the outer topsheet 9A and the inner topsheet 9B are joined becomes a flow path when the liquid flows back, and therefore the liquid is difficult to transfer from the inner topsheet 9B to the outer topsheet 9A. Therefore, the outer top sheet 9A can be made less likely to be wetted with the returned liquid.

In this way, by the multilayer structure of the top sheet 9 shown in fig. 4A and 4B or fig. 5A and 5B, the movement of the liquid that flows back can be suppressed (controlled), and the outer top sheet 9A can be maintained in a dry state. Therefore, the weakly acidic nature of the outer topsheet 9A can be fully exerted.

In the diaper 1 of the present embodiment, the absorber 8 has grooves 8SL and 8SR extending in the longitudinal direction. The grooves 8SL and 8SR penetrate the absorber 8 in the thickness direction.

Fig. 7 is a diagram illustrating the flow of urine discharged by the wearer in the diaper 1 according to embodiment 1.

As shown by arrows in fig. 7, urine discharged from the wearer is temporarily accumulated in the urine accumulation space S1 formed in the region on the front region 1F side of the absorber 8 through the top sheet 9. Further, as described above, the space S1 is a space including the meatus corresponding region 40. In the present embodiment, the absorber 8 has the grooves 8SL and 8SR extending in the longitudinal direction, and thus urine stored in the space S1 can be quickly moved from the region on the front body region 1F side to the region on the rear body region 1R side (from the region on the right side to the region on the left side in fig. 7 through the central region) through the grooves 8SL and 8 SR. This allows urine stored in the space S1 to quickly enter and be held in the entire longitudinal direction of the absorbent body 8, and thus the top sheet 9, particularly the outer top sheet 9A, can be quickly brought into a dry state. Therefore, the weakly acidic nature of the outer topsheet 9A can be more fully exerted.

Further, since the urine accumulated in the space S1 can be moved toward the crotch region 1B side region and the rear body region 1R side region by the grooves 8SL and 8SR extending in the longitudinal direction, the urine can be prevented from being concentrated and immersed in the space S1 of the absorber 8, that is, the region 40 corresponding to the urethral orifice and the region around the same, and held therein. Therefore, the occurrence of reflux from the region 40 corresponding to the urethral orifice of the absorber 8 and the region around the same can be suppressed.

By penetrating the grooves 8SL, 8SR through the absorber 8 in the thickness direction, urine accumulated in the space S1 can be moved from the skin-surface-side surface (the surface on the top sheet 9 side in fig. 7) to the non-skin-surface-side surface (the surface on the back sheet 7 side in fig. 7) of the absorber 8. Thus, urine accumulated in the space S1 can be quickly immersed in and held by the skin-side surface as well as the non-skin-side surface, and the outer top sheet 9A can be more quickly brought into a dry state. Therefore, the weakly acidic nature of the outer topsheet 9A can be more fully exerted.

Further, since urine accumulated in the space S1 can be moved from the skin-side surface of the absorber 8 to the non-skin-side surface by the grooves 8SL, 8SR penetrating in the thickness direction, it is possible to avoid a situation where urine is concentrated and immersed in the skin-side surface of the absorber 8 and held there. Therefore, the occurrence of back flow from the skin surface side surface of the absorber 8 can be suppressed.

< modification 1 of embodiment 1>

Next, a diaper 1 according to modification 1 of embodiment 1 will be described. Fig. 8 is a longitudinal cross-sectional view of the absorber 8 in the case where only the absorber 8 is extracted from the diaper 1 of the present modification and is cut by a cross-section including the grooves 8 SL. In the present modification, 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 absorber 8 is manufactured by a forming drum. The groove 8SR has the same shape as the groove 8 SL. In the diaper 1 of the present modification, since the pair of grooves 8SL and 8SR are formed so as to be shallower at both ends in the longitudinal direction, the flow rate of urine flowing out of the grooves 8SL and 8SR from the ends in the longitudinal direction can be reduced, and urine leakage due to urine flowing out of the grooves 8SL and 8SR at a high flow rate can be suppressed. In the diaper 1 of the present modification, even when the longitudinal ends of the grooves 8SL, 8SR are in contact with the skin of the urethral meatus and the vicinity thereof, the contact of the grooves 8SL, 8SR with the skin of the urethral meatus and the vicinity thereof can be reduced.

< modification 2 of embodiment 1 >

Next, a diaper 1 according to modification 2 of embodiment 1 will be described. Fig. 9A and 9B are diagrams schematically showing a state in which the diaper 1 of the present modification is developed and extended. In the diaper 1 of the present modification, the absorber 8 has a groove 8SM formed between the pair of grooves 8SL, 8SR and extending in the longitudinal direction of the diaper 1. The grooves 8SM are formed in parallel with the same shape and the same length as the grooves 8SL and 8 SR. The grooves 8SM are formed at the same positions in the longitudinal direction as the grooves 8SL and 8 SR. In the diaper 1 of the present modification, since the absorber 8 has the groove 8SM, the absorber 8 is easily folded along the groove 8SM, and thus a space for storing urine is easily formed in the wearing state.

< embodiment 2>

Next, embodiment 2 will be described. In the diaper 1 of embodiment 1, the grooves 8SL and 8SR penetrate the absorber 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 non-penetrating concave shape.

Fig. 10A and 10B are diagrams schematically showing a state in which the diaper 1 of embodiment 2 is developed and extended. Fig. 10A schematically shows the internal configuration of the diaper 1 in an unfolded and extended state when viewed from the left side. Fig. 10B schematically shows a plan view of the diaper 1 in an unfolded and extended state. The diaper 1 of the present embodiment has the same structure as the diaper 1 of embodiment 1 except for the structure of the absorber. Therefore, in the diaper 1 of the present embodiment, the same reference numerals are given to the same components as those of the diaper 1 of embodiment 1, and the description thereof is omitted.

As shown in fig. 10A and 10B, in the diaper 1 of the present embodiment, the absorber 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 recessed from the skin surface side surface of the absorber 8 toward the non-skin surface side in the thickness direction, and extend around the crotch region 1B. The grooves 8TL, 8TR have the same length, width, and depth as each other, 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 of the diaper 1 in the width direction, and are formed parallel to each other. The interval W between the center lines of the grooves 8TL, 8TR and the length L1 of the web end portions of the pair of grooves 8TL, 8TR from the center in the longitudinal direction of the diaper 1 are set to be the same as the interval W between the center lines of the grooves 8SL, 8SR in embodiment 1 and the length L1 of the web end portions of the pair of grooves 8SL, 8SR from the center in the longitudinal direction of the diaper 1. With the structure and arrangement of the grooves 8TL, 8TR, in the diaper 1 of the present embodiment, as in the diaper 1 of embodiment 1, a space S1 for accumulating urine is formed in the region on the front body region 1F side in the absorber 8.

The absorber 8 has a circular through hole 8TH penetrating in the thickness direction of the absorber 8. The through hole 8TH is provided in the urethral meatus 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.

Since the diaper 1 of the present embodiment has the same multilayered structure as the diaper 1 of embodiment 1 in the top sheet 9, the outer top sheet 9A can be made less likely to be wetted with the liquid flowing back from the absorber 8. This can fully exert the weakly acidic property of the outer top sheet 9A.

In the diaper 1 of the present embodiment, the absorber 8 has grooves 8TL, 8TR extending in the longitudinal direction. The absorber 8 has a through hole 8TH penetrating in the thickness direction.

Fig. 11 is a diagram illustrating the flow of urine discharged by the wearer in the diaper 1 according to embodiment 2.

In the diaper 1 of the present embodiment, since the absorber 8 has the grooves 8TL and 8TR extending in the longitudinal direction, the urine accumulated in the urine storage space S1 can be quickly moved from the region on the skin surface side of the absorber 8 from the front body region 1F side to the region on the rear body region 1R side (from the region on the right side to the region on the left side in fig. 11 through the central region) through the grooves 8TL and 8TR as indicated by the arrows in fig. 11. Thus, urine stored in the space S1 can be quickly immersed in and held by the entire longitudinal direction of the skin surface side of the absorber 8, and the top sheet 9, particularly the outer top sheet 9A, can be quickly brought into a dry state. Therefore, the weakly acidic nature of the outer topsheet 9A can be more fully exerted.

The grooves 8TL, 8TR can avoid the situation where urine is intensively immersed in and held in the space S1 of the absorber 8, that is, the region 40 corresponding to the urethral orifice and the region around the urethral orifice. Therefore, the occurrence of reflux from the region 40 corresponding to the urethral orifice of the absorber 8 and the region around the same can be suppressed.

The absorber 8 has a through hole 8TH penetrating in the thickness direction. Thus, urine accumulated in the space S1 can be moved from the skin-surface-side surface (the top sheet 9-side surface in fig. 11) to the non-skin-surface-side surface (the back sheet 7-side surface in fig. 11) of the absorber 8. Further, since the through holes 8TH are provided in the urethral orifice corresponding region 40 in the space S1, urine accumulated in the space S1 can be efficiently moved to the surface of the absorber 8 on the non-skin surface side. Thus, urine accumulated in the space S1 can be quickly immersed in and held by the skin-side surface as well as the non-skin-side surface, and the outer top sheet 9A can be more quickly brought into a dry state. Therefore, the weakly acidic nature of the outer topsheet 9A can be more fully exerted.

The through holes 8TH can prevent urine from being concentrated and retained in the skin surface side of the absorber 8. Therefore, the occurrence of back flow from the skin surface side surface of the absorber 8 can be suppressed.

< modification 1 of embodiment 2>

Next, a diaper 1 according to modification 1 of embodiment 2 will be described. Fig. 12A and 12B are diagrams schematically showing a state in which the diaper 1 according to the present modification is developed and extended. As shown in fig. 12A and 12B, in the diaper 1 of the present modification, the absorber 8 has a plurality of through holes 8TH (2 in the present modification). The plurality of through holes 8TH are provided in the region around the region 40 corresponding to the meatus. For example, the plurality of through holes 8TH are provided between the urethral meatus corresponding region 40 and the ventral end portions of the grooves 8TL, 8 TR. In the diaper 1 of the present modification, since the through holes 8TH are provided in the peripheral region of the region 40 corresponding to the urethral orifice, the plurality of through holes 8TH are also hardly abutted against the urethral orifice via the top sheet 9. Thus, the diaper 1 can prevent the through-holes 8TH from irritating the urethral orifice and prevent skin problems in the vicinity of the urethral orifice.

< modification 2 of embodiment 2>

Next, a diaper 1 according to modification 2 of embodiment 2 will be described. Fig. 13 is a plan view of the diaper 1 according to the present modification in which only the absorber 8 is extracted and the absorber 8 is viewed from the non-skin surface side. Fig. 14 is a diagram illustrating the flow of urine discharged by the wearer in the diaper 1 according to the present modification.

In the diaper 1 of the present modification, the absorber 8 has a pair of grooves 8TL, 8TR extending in the longitudinal direction on the skin-side surface as in the diaper 1 of embodiment 2. As shown in fig. 13, the absorber 8 has a pair of grooves 8UL and 8UR extending in the longitudinal direction on the non-skin-surface side surface. The pair of grooves 8UL, 8UR have a concave shape recessed from the surface of the absorber 8 on the non-skin surface side toward the skin surface side in the thickness direction, and extend around the crotch region 1B. The grooves 8UL and 8UR have the same length, width and depth, and are arranged at the same positions in the longitudinal direction of the diaper 1. The grooves 8UL and 8UR are arranged symmetrically with respect to the center of the diaper 1 in the width direction, and are formed parallel to each other. The interval W between the center lines of the grooves 8UL and 8UR and the length L1 of the abdomen end portion of the pair of grooves 8UL and 8UR from the center in the longitudinal direction of the diaper 1 are set to the same value as the interval W between the center lines of the grooves 8SL and 8SR in the diaper 1 according to embodiment 1 and the length L1 of the abdomen end portion of the pair of grooves 8SL and 8SR from the center in the longitudinal direction of the diaper 1.

In the diaper 1 of the present modification, since the through holes 8TH are provided in the absorber 8, as in the diaper 1 of embodiment 2, urine stored in the urine storage space S1 can be moved from the skin-side surface of the absorber 8 to the non-skin-side surface via the through holes 8TH as indicated by arrows in fig. 14. Further, in the diaper 1 of the present modification, since the grooves 8UL and 8UR extending in the longitudinal direction are provided in the absorber 8, urine that has moved to the non-skin surface side of the absorber 8 can be quickly moved from the region on the non-skin surface side of the absorber 8 through the grooves 8UL and 8UR from the region on the front body region 1F side to the region on the rear body region 1R side (from the region on the right side to the region on the left side in fig. 14 through the region in the center). Thus, urine stored in the space S1 can be quickly immersed in and held by the entire longitudinal direction of the non-skin surface side of the absorbent body 8, and the outer top sheet 9A can be more quickly brought into a dry state. Therefore, the weakly acidic nature of the outer topsheet 9A can be more fully exerted.

In the diaper 1 of the present modification, the grooves 8TL, 8TR, 8UL, 8UR are provided on the surface of both the skin surface side and the non-skin surface side of the absorber 8, but the present invention is not limited thereto. For example, the grooves 8TL, 8TR may not be provided on the skin-surface side surface of the absorber 8, but the grooves 8UL, 8UR may be provided only on the non-skin-surface side surface of the absorber 8.

< embodiment 3 >

Next, embodiment 3 will be described. In the diaper 1 of embodiment 1 described above, the top sheet 9 has a multilayer structure including 2 sheets of the outer top sheet 9A and the inner top sheet 9B, but the present invention is not limited thereto. For example, the top sheet 9 may have a single-layer structure including 1 sheet.

In the diaper 1 of the present embodiment, the top sheet 9 is 1 sheet having liquid permeability and having a weak acidic property, and contains a pH adjusting component. As the pH adjusting component, an organic acid, for example, malic acid or citric acid which is highly safe and substantially odorless in the state before use of the diaper 1 is used. The top sheet 9 is produced by applying a chemical solution containing an organic acid to a neutral sheet. The diaper 1 of the present embodiment has the same structure as the diaper 1 of embodiment 1 shown in fig. 3A and 3B except for the structure of the top sheet 9. Therefore, in the present embodiment, a description other than the structure of the top sheet 9 is omitted.

Since the top sheet 9 is weakly acidic, even if the back flow described in embodiment 1 occurs, the pH adjusting component of the top sheet 9 can neutralize the alkali component such as ammonia contained in the liquid excreted from the wearer held by the absorber 8. Therefore, the skin of the wearer can be maintained neutral from weak acidity, and the occurrence of skin problems can be suppressed.

However, as described in embodiment 1, the present inventors found that: when the top sheet 9 is in a state of being wetted with a liquid or the like that flows back, the top sheet 9 may not sufficiently exhibit the weakly acidic property of the top sheet 9 because the top sheet 9 is covered with the liquid.

Therefore, in the diaper 1 of the present embodiment, the absorber 8 has the grooves 8SL, 8SR penetrating the absorber 8 in the thickness direction so that the sheet properties can be fully exhibited.

In the diaper 1 of the present embodiment, as in the diaper 1 of embodiment 1, that is, as shown by the arrows in fig. 7, urine discharged by the wearer is temporarily accumulated in the urine accumulation space S1 formed in the region on the front region 1F side of the absorber 8 through the top sheet 9. In the present embodiment, since the absorber 8 has the grooves 8SL and 8SR penetrating the absorber 8 in the thickness direction, urine accumulated in the space S1 can be moved from the skin-side surface (the surface on the top sheet 9 side in fig. 7) to the non-skin-side surface (the surface on the back sheet 7 side in fig. 7) of the absorber 8 via the grooves 8SL and 8 SR. Thus, urine accumulated in the space S1 can be quickly immersed in and held by the surface of the absorbent body 8 on the skin surface side as well as the surface on the non-skin surface side, and thus the top sheet 9 can be quickly brought into a dry state. Therefore, the weakly acidic property of the top sheet 9 can be sufficiently exhibited.

By extending the grooves 8SL and 8SR in the longitudinal direction, urine accumulated in the space S1 can be quickly moved from the region on the front region 1F side through the grooves 8SL and 8SR to the region on the rear region 1R side (the region on the left side from the region on the right side through the center in fig. 7) through the region on the crotch region 1B side. This allows urine stored in the space S1 to quickly enter and be held in the entire longitudinal direction of the absorbent body 8, and thus the top sheet 9 can be dried more quickly. Therefore, the weakly acidic property of the top sheet 9 can be more fully exerted.

Further, since the urine accumulated in the space S1 can be moved not only to the space S1 of the absorber 8, that is, the region corresponding to the urethral orifice 40 and the region around the urethral orifice, but also to the region on the crotch region 1B side and the region on the rear body region 1R side by the grooves 8SL and 8SR extending in the longitudinal direction, it is possible to avoid a situation in which the urine is concentrated and immersed in the region corresponding to the urethral orifice 40 and the region around the urethral orifice of the absorber 8 and held there. Therefore, the occurrence of reflux from the region 40 corresponding to the urethral orifice of the absorber 8 and the region around the same can be suppressed.

< embodiment 4 >

Next, embodiment 4 will be described. In the diaper 1 according to embodiment 3, the grooves 8SL and 8SR penetrate the absorber 8 in the thickness direction, but the present invention is not limited to this. For example, as in the diaper 1 of embodiment 2, the grooves 8SL and 8SR may be formed in a non-penetrating concave shape.

In the diaper 1 of the present embodiment, the top sheet 9 is 1 sheet having liquid permeability and having a weak acidic property, and contains a pH adjusting component, as in the diaper 1 of embodiment 3.

Further, as in the diaper 1 of embodiment 2 shown in fig. 10A and 10B, the absorber 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 recessed from the skin surface side surface of the absorber 8 toward the non-skin surface side in the thickness direction, and extend around the crotch region 1B. The grooves 8TL, 8TR have the same length, width, and depth as each other, 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 of the diaper 1 in the width direction, and are formed parallel to each other. The interval W between the center lines of the grooves 8TL, 8TR and the length L1 of the web end portions of the pair of grooves 8TL, 8TR from the center in the longitudinal direction of the diaper 1 are set to be the same as the interval W between the center lines of the grooves 8SL, 8SR in embodiment 1 and the length L1 of the web end portions of the pair of grooves 8SL, 8SR from the center in the longitudinal direction of the diaper 1. By the configuration and arrangement of the grooves 8TL, 8TR, the diaper 1 of the present embodiment also forms the urine storage space S1 in the region on the front body region 1F side of the absorber 8, similarly to the diaper 1 of embodiment 3.

In the diaper 1 of the present embodiment, the absorber 8 has the through-holes 8TH penetrating in the thickness direction of the absorber 8, so that urine stored in the urine storage space S1 can be moved from the surface on the skin surface side of the absorber 8 (the surface on the top sheet 9 side in fig. 11) to the surface on the non-skin surface side (the surface on the back sheet 7 side in fig. 11) as in the diaper 1 of the 2 nd embodiment, that is, as indicated by the arrows in fig. 11. Further, since the through holes 8TH are provided in the urethral orifice corresponding region 40 in the space S1, urine accumulated in the space S1 can be efficiently moved to the surface of the absorber 8 on the non-skin surface side. Thus, urine accumulated in the space S1 can be quickly immersed in and held by the skin-side surface of the absorber 8 as well as the non-skin-side surface, and thus the top sheet 9 can be quickly brought into a dry state. Therefore, the weakly acidic property of the top sheet 9 can be sufficiently exhibited.

Further, since the absorber 8 has the grooves 8TL, 8TR extending in the longitudinal direction, urine accumulated in the space S1 can be quickly moved from the region on the skin surface side of the absorber 8 through the grooves 8TL, 8TR to the region on the rear body region 1R side (the region on the right side through the center in fig. 11) from the region on the front body region 1F side through the region on the crotch region 1B side. This allows urine stored in the space S1 to quickly enter and be held in the entire longitudinal direction of the skin surface side of the absorber 8, and thus the top sheet 9 can be dried more quickly. Therefore, the weakly acidic property of the top sheet 9 can be more fully exerted.

Furthermore, the grooves 8TL, 8TR can prevent urine from being concentrated and retained in the region 40 corresponding to the urethral orifice of the absorber 8 and the region around the urethral orifice. Therefore, the occurrence of reflux from the region 40 corresponding to the urethral orifice of the absorber 8 and the region around the same can be suppressed.

< modification 1 of embodiment 4 >

Next, a diaper 1 according to modification 1 of embodiment 4 will be described. In the diaper 1 of the present modification, the absorber 8 has a plurality of through holes 8TH (2 in the present modification) similarly to the diaper 1 of modification 1 of embodiment 2 shown in fig. 12A and 12B. The plurality of through holes 8TH are provided in the region around the region 40 corresponding to the meatus. For example, the plurality of through holes 8TH are provided between the urethral opening corresponding region 40 and the abdomen-side ends of the grooves 8TL, 8TR. In the diaper 1 of the present modification, since the through holes 8TH are provided in the peripheral region of the region 40 corresponding to the urethral orifice, the plurality of through holes 8TH are also hardly abutted against the urethral orifice via the top sheet 9. This prevents the through-holes 8TH from irritating the urethral orifice, and prevents skin problems in the vicinity of the urethral orifice.

< modification 2 of embodiment 4 >

Next, a diaper 1 according to modification 2 of embodiment 4 will be described. In the diaper 1 of the present modification, the absorber 8 has a pair of grooves 8TL, 8TR extending in the longitudinal direction on the skin-side surface as in the diaper 1 of embodiment 4, that is, as in the diaper 1 of embodiment 2 shown in fig. 10A and 10B. The absorber 8 has a pair of grooves 8UL and 8UR extending in the longitudinal direction on the non-skin-surface side surface, similarly to the diaper 1 of modification 2 of embodiment 2 shown in fig. 13. The pair of grooves 8UL, 8UR have a concave shape recessed from the surface of the absorber 8 on the non-skin surface side toward the skin surface side in the thickness direction, and extend around the crotch region 1B. The grooves 8UL and 8UR have the same length, width and depth, and are arranged at the same positions in the longitudinal direction of the diaper 1. The grooves 8UL and 8UR are arranged symmetrically with respect to the center of the diaper 1 in the width direction, and are formed parallel to each other. The interval W between the center lines of the grooves 8UL and 8UR and the length L1 of the abdomen end portion of the pair of grooves 8UL and 8UR from the center in the longitudinal direction of the diaper 1 are set to the same value as the interval W between the center lines of the grooves 8SL and 8SR in the diaper 1 according to embodiment 1 and the length L1 of the abdomen end portion of the pair of grooves 8SL and 8SR from the center in the longitudinal direction of the diaper 1.

In the diaper 1 of the present modification, since the through holes 8TH are provided in the absorber 8, as in the diaper 1 of embodiment 2, urine stored in the urine storage space S1 can be moved from the skin-side surface of the absorber 8 to the non-skin-side surface via the through holes 8TH as indicated by arrows in fig. 11. Further, in the diaper 1 of the present modification, since the grooves 8UL and 8UR extending in the longitudinal direction are provided in the absorber 8, urine that has moved to the non-skin surface side of the absorber 8 can be quickly moved from the region on the non-skin surface side of the absorber 8 through the grooves 8UL and 8UR from the region on the front body region 1F side to the region on the rear body region 1R side (from the region on the right side to the region on the left side in fig. 11 through the region in the center). Thus, urine stored in the space S1 can be quickly immersed in the entire longitudinal direction of the non-skin surface side of the absorbent body 8 and held therein, and therefore the top sheet 9 can be more quickly brought into a dry state. Therefore, the weakly acidic property of the top sheet 9 can be more fully exerted.

< embodiment 5 >

Next, embodiment 5 will be described. In the diaper 1 of embodiment 3, the top sheet 9 contains a pH adjusting component and has a weakly acidic property, but the present invention is not limited to this. For example, the topsheet 9 may also have neutral properties.

Fig. 15A and 15B are diagrams schematically showing a state in which the diaper 1 of embodiment 5 is developed and extended. Fig. 15A schematically shows the internal configuration of the diaper 1 in an unfolded and extended state when viewed from the left side. Fig. 15B schematically shows a plan view of the diaper 1 in an unfolded and extended state. The diaper 1 of the present embodiment has substantially the same structure as the diaper 1 of embodiment 3 except for the nature of the top sheet. Therefore, in the diaper 1 of the present embodiment, the same reference numerals are given to the same components as those of the diaper 1 of embodiment 3, and the description thereof is omitted.

In the diaper 1 of the present embodiment, the top sheet 29 is 1 sheet of liquid-permeable material which is in contact with the skin of the wearer, and has neutral properties.

In embodiment 1, the length L1 of the abdomen-side end portion of the pair of grooves 8SL, 8SR from the center in the longitudinal direction is defined when the diaper 1 is folded in half so that the end portions in the longitudinal direction overlap each other, but in the present embodiment, the length of the back-side end portion of the pair of grooves 8SL, 8SR from the center in the longitudinal direction is also defined. When the diaper 1 is folded in half with the two-dot chain line FL, the diaper 1 is suitable for infants and infants having a weight in the range of 5kg to 13kg when the length (L4 in fig. 15B) of the rear end portions of the pair of grooves 8SL, 8SR from the center in the longitudinal direction of the diaper 1 (two-dot chain line FL) is in the range of 40mm to 50 mm. Further, when the diaper 1 is folded in half with the two-dot chain line FL, the diaper 1 is suitable for infants and children having a weight in a range of 8kg to 15kg when the length (L4) of the rear end portions of the pair of grooves 8SL, 8SR from the center in the longitudinal direction of the diaper 1 (two-dot chain line FL) is in a range of 65mm to 75 mm. Further, when the diaper 1 is folded in half with the two-dot chain line FL, the diaper 1 is suitable for infants and children having a weight in a range of from 11kg to 23kg when the length (L4) of the rear end portions of the pair of grooves 8SL, 8SR from the center in the longitudinal direction of the diaper 1 (two-dot chain line FL) is in a range of from 40mm to 50 mm. Further, when the diaper 1 is folded in half with the two-dot chain line FL, the diaper 1 is suitable for infants and children having a weight in a range of from 12kg to 29kg when the length (L4) of the rear end portions of the pair of grooves 8SL, 8SR from the center in the longitudinal direction of the diaper 1 (two-dot chain line FL) is in a range of from 50mm to 60 mm.

It is preferable that not only the stretchable member (elastic member) such as the linear rubber be not disposed in the urethral orifice corresponding region 40, but also the stretchable member (elastic member) such as the linear rubber be not disposed in the anus corresponding region 30. By not disposing the stretchable member in the anus-corresponding region 30, it is possible to prevent the formation of a space for holding feces from being hindered.

The space for holding feces is formed by the diaper 1 bulging in a dome shape from an imaginary rising line L5, which is shown in a rectangular shape by a thick dotted line in fig. 15B, toward the non-skin surface side. The position of the rising line L5 will be described below.

The abdominal gathers 3T are formed on both sides in the width direction of the anus-corresponding region 30 and are located on the outer side in the width direction than the extension line of the back side (the rear body region 1R side) of the pair of grooves 8SL, 8 SR. The abdominal gather 3T on the rear body region 1R side is an arrangement region of the linear rubbers 4R4, 4R5, and the linear rubbers 4R4, 4R5 are arranged on both sides in the width direction of the anus corresponding region 30 and are positioned on the outer side in the width direction than the extension line of the back side (rear body region 1R side) of the pair of grooves 8SL, 8 SR. This is because, in the wearing state of the diaper 1, a space for holding feces is required to be formed so as to include at least the anus corresponding region 30, but if the space is too large, feces may not be held, and therefore, a space of a size capable of holding the 1 st urination of an infant is required to be formed. Therefore, in the present embodiment, the widthwise end of the abdominal gather 3T is pressed against the skin surface by the contraction force of the linear rubbers 4R4, 4R5 at the outer side in the width direction than the extension line of the pair of grooves 8SL, 8SR, instead of pressing the anus-corresponding region 30 against the skin surface, so that the widthwise end of the standing line L5 is defined at the widthwise end of the abdominal gather 3T. This prevents the space from being excessively expanded in the width direction of the diaper 1.

In addition, considering the position of the anus of the infant or the like, the length (L6 in fig. 15B) of the anus corresponding region 30 in the longitudinal direction of the diaper 1 is preferably 50mm. As shown in fig. 15A and 15B, the linear rubbers 4R4 and 4R5 disposed on the outer side in the width direction of the anus-corresponding region 30 are disposed at a shorter interval than the linear rubbers 4R5 disposed on the outer side in the width direction of the rear end portions of the pair of grooves 8SL and 8 SR. Therefore, the expansion and contraction force of the abdominal gather 3T on the outer side in the width direction of the anus-corresponding region 30 is larger than the expansion and contraction force of the rear side ends of the pair of grooves 8SL, 8SR on the outer side in the width direction. This is because, since the back side end portions of the grooves 8SL, 8SR define the rising line L5 on the crotch region 1B side formed by the space, the diaper 1 may be pressed against the skin with a necessary and sufficient force on the outer sides in the width direction of the grooves 8SL, 8SR, but if the outer sides in the width direction of the anus corresponding region 30 are expansion and contraction forces of the same extent as or weaker than the outer sides in the width direction of the grooves 8SL, 8SR, the space is expanded in the width direction, and the space in which the size of 1 defecation amount of the infant can be maintained cannot be maintained. In the diaper 1 of the present embodiment, the expansion and contraction force of the abdomen gather 3T on the outer side in the width direction of the anus corresponding region 30 is made larger than the expansion and contraction force of the back side end portions of the pair of grooves 8SL, 8SR on the outer side in the width direction, whereby the space can be prevented from becoming excessively large, and the space for holding feces can be appropriately maintained.

Further, a waist gather 3R is provided on the back side of the anus-corresponding region 30. The waist gather 3R defines a rising line L5 on the back side of the space for holding feces by pressing the diaper 1 against the skin surface. That is, the standing line L5 on the back side of the predetermined space on the crotch region 1B side (the linear rubber 4R3 on the crotch region 1B side) of the waist gather 3R. The diaper 1 of the present embodiment can prevent the space from becoming excessively large to the back side by the waist gather 3R, and can appropriately maintain the space for holding feces.

As shown in fig. 15B, when the diaper 1 is viewed in plan, the longitudinal end portion of the absorber 8 is positioned inside the back end portion (end portion on the rear body region 1R side) of the cushion cover 6, and a part of the linear rubber 4R3 forming the waist gather 3R overlaps the absorber 8. Thus, the diaper 1 can define the end portion of the waist gather 3R on the crotch region 1B side as the space back side standing line L5 without using the back side end portions of the back cover sheet 6 and the absorber 8 as the space back side standing line L5. If the back side end portions of the cushion cover sheet 6 and the absorber 8 are set as physical standing lines of the space, the physical standing lines may contact the urethral orifice and the skin around the urethral orifice, and thus there is a possibility that a problem such as a skin problem may occur. In contrast, in the diaper 1 of the present embodiment, the crotch region 1B side of the waist gather 3R can be defined as the virtual standing line L5 on the back side of the space, so that a space for holding feces can be formed, and problems such as skin problems that may occur due to contact of the physical standing line with the buttocks can be prevented.

The length in the width direction of the overlapping portion 8C of the absorbent body 8 overlapping the waist gather 3R is shorter than the length in the width direction of the portion 8D on the crotch side of the overlapping portion 8C. Here, the overlapping portion 8C is a portion overlapping the linear rubber 4R3 in the absorber 8, and the crotch portion 8D is a portion closer to the crotch region 1B than the specific gravity portion 8C. By using the absorber 8 having such a shape, the widthwise end portion of the overlapping portion 8C is contracted inward in the widthwise direction, and a space for holding feces is easily formed.

As shown in fig. 15B, when the diaper 1 is viewed in plan, the widthwise end portions of the linear rubbers 4R4, 4R5 overlap the absorber 8, and are directly or indirectly bonded to the absorber 8. Here, the direct bonding of the end portion to the absorber 8 means that the end portion is directly bonded to the absorber 8, and the indirect bonding of the end portion to the absorber 8 means that the end portion is bonded to the absorber 8 via the inner cover sheet 5R, the cushion cover sheet 6, and the back sheet 7. In the present embodiment, the end portion is indirectly bonded to the absorber 8. If the linear rubbers 4R4 and 4R5 are provided on the outer side in the width direction than the absorber 8, the absorber 8 and the linear rubbers 4R4 and 4R5 are not directly or indirectly bonded, the expansion and contraction force generated by the linear rubbers 4R4 and 4R5 will be exerted on the outer side in the width direction than the absorber 8, and the expansion and contraction force will not contribute to the formation of a space for holding feces. In the diaper 1 of the present embodiment, since the widthwise end portions of the linear rubbers 4R4, 4R5 are indirectly bonded to the absorber 8, the expansion and contraction force generated by the linear rubbers 4R4, 4R5 can contribute to the formation of a space. The stretching force generated by the linear rubbers 4R4, 4R5 is exerted by pulling the abdominal gather 3T to the outside in the width direction in the wearing state of the diaper 1 than in the non-wearing state of the diaper 1.

As described above, the region on the front body region 1F side of the diaper 1 bulges like a dome toward the non-skin surface side due to the force of pulling the diaper 1 outward in the width direction by the linear rubbers 4F4 and 4F5, and a space for accumulating urine is formed. Further, by the force of pulling the diaper 1 outward in the width direction by the linear rubbers 4R4, 4R5, the region on the rear body region 1R side of the diaper 1 bulges like a dome toward the non-skin surface side, and a space for holding feces is formed. Under the influence of the forces contributing to the formation of these spaces, the pair of grooves 8SL and 8SR easily separate from the skin surface of the wearer and bulge toward the non-skin surface side in the crotch region 1B side of the diaper 1.

The length L4 of the rear end portions of the pair of grooves 8SL and 8SR, the length L6 of the space rear standing line L5, and the length of the anus corresponding region 30 in the longitudinal direction of the diaper 1 are applicable not only to the diaper 1 of the present embodiment but also to the diapers 1 of the first to 4 th embodiments.

In addition to the structure of the diaper 1 according to embodiment 3, the diaper 1 according to the present embodiment further includes a pair of indicators for detecting urination of the wearer at a position on the non-skin surface side of the absorber 8. Fig. 16 is a plan view of the indicator as seen from the skin side. In fig. 16, the absorber 8 is shown with a broken line for explaining the position of the indicator with respect to the absorber 8.

As shown in fig. 16, a pair of indicators 16 (an example of "urine detector" in the present application) are provided on the skin-side surface of the backsheet 7 opposite to the non-skin-side surface of the absorber 8. The indicator 16 is disposed in the center portion of the diaper 1 in the width direction, and extends in the longitudinal direction of the diaper 1 around the crotch region 1B. The indicator 16 is disposed so as to be sandwiched between the back sheet 7 at positions corresponding to the pair of grooves 8SL, 8SR of the absorber 8 from both sides in the width direction of the back sheet 7. That is, it can be said that the pair of grooves 8SL, 8SR are arranged so as to sandwich the portion of the absorber 8 corresponding to the pair of indicators 16 from both sides in the width direction of the absorber 8. The indicator 16 is formed by applying an adhesive such as a hot melt adhesive, which is mixed with a pH indicator such as nitrazine yellow or bromothymol blue, which changes color due to a change in pH of moisture, to the back sheet 7. The indicator 16 may be formed by, for example, applying an adhesive containing a light-scattering powder that changes color due to the presence of moisture, such as a silica powder or an aluminum silicate powder, to the back sheet 7. The color of these indicators 16 can be visually confirmed even through the pad cover sheet 6 when the diaper 1 is viewed from the non-skin side. When urine discharged from the wearer contacts the indicator 16, the indicator changes color due to the pH and moisture of the urine, and the urine discharged from the wearer is detected. Thus, the diaper 1 of the present embodiment can notify the other person of urination of the wearer.

Instead of the indicator 16 provided on the backsheet 7, the diaper 1 may be provided with a liquid-impermeable sheet as an indicator sheet, which is disposed between the absorber 8 and the backsheet 7 and which is impregnated with the aforementioned dispersion of the pH indicator or the light-scattering powder.

The indicator 16 is provided in the back sheet 7 on the crotch region 1B side and in the center in the width direction. On the other hand, the wearer sometimes sweats inside the diaper 1. For example, when the wearer sweats in the crotch, sweat penetrates from the skin of the wearer through the top sheet 29 to the crotch region 1B side portion of the skin-side surface of the absorber 8. In particular, the absorbent body 8 is immersed while flowing on the skin-side surface of the absorbent body 8 from the widthwise end portions of the absorbent body 8 toward the widthwise center portion at the lowest position in the worn state. When the wearer sweats on the abdomen or back, sweat flows from the front region 1F side region or the rear region 1R side region of the skin surface side surface of the absorber 8 toward the crotch region 1B side region which is positioned lower than the front region in the worn state, and is immersed. As a result, the indicator 16 may react with sweat of the wearer, resulting in false detection. As a result, there are some cases where there is a problem such as that the diaper 1 is changed or the other person touches the inside of the diaper 1 to confirm whether the diaper 1 is still usable.

However, in the diaper 1 of the present embodiment, the pair of grooves 8SL, 8SR are arranged so as to sandwich the portion of the absorber 8 corresponding to the indicator 16 from both sides in the width direction of the absorber 8. As a result, sweat of the wearer flows on the skin-side surface of the absorber 8 as follows.

Fig. 17 is a diagram illustrating the flow of sweat of the wearer in the skin-side surface of the absorber 8. In fig. 17, for the purpose of illustrating the position of the indicator 16 relative to the absorber 8, the indicator 16 is indicated by a broken line. In fig. 17, the space for accumulating urine and the space for holding feces in the absorber 8 are indicated by rectangles with broken lines. The shape of these spaces in fig. 17 is an example, and is not limited to a rectangular shape.

As described above, by disposing the pair of grooves 8SL, 8SR, as shown by arrows in fig. 17, for example, sweat on the outer side in the width direction than the grooves 8SL, 8SR among sweat generated in the crotch portion of the wearer flows from the end portions in the width direction toward the surface on the skin surface side of the absorber 8 toward the center portion, but is blocked by the grooves 8SL, 8SR or enters the grooves 8SL, 8SR. As a result, with regard to such sweat, the sweat is not immersed in and held in the region outside the grooves 8SL and 8SR in the width direction or in the region inside the grooves 8SL and 8SR in the width direction, that is, the region between the pair of grooves 8SL and 8SR, in the surface on the skin surface side of the absorber 8. Further, sweat outside the grooves 8SL, 8SR in the width direction among sweat discharged from the abdomen or the back of the wearer flows from the front body region 1F side region or the rear body region 1R side region of the skin surface side surface of the absorber 8 toward the crotch region 1B side region, but is blocked by the grooves 8SL, 8SR or enters the grooves 8SL, 8SR. As a result, the sweat does not penetrate into the region between the pair of grooves 8SL and 8SR in the skin-side surface of the absorber 8. Therefore, the indicator 16 can be prevented from being erroneously detected due to the reaction of sweat moisture and pH.

In the diaper 1 of the present embodiment, the linear rubbers 4F4 and 4F5 are disposed in an elongated state on the outer side in the width direction of the diaper 1 at the abdomen-side end portions of the pair of grooves 8SL and 8SR, whereby the urine storage space S1 is formed in the region on the front region 1F side of the absorber 8. Further, by disposing the linear rubber 4R5 in an elongated state on the outer side in the width direction of the diaper 1 at the rear end portions of the pair of grooves 8SL, 8SR, a space S2 for holding feces is formed in the region on the rear region 1R side of the absorber 8. As shown by arrows in fig. 17, these spaces S1 and S2 are formed, sweat on the inner side in the width direction than the grooves 8SL and 8SR among sweat generated from the abdomen or the back of the wearer flows from the front body region 1F side region or the rear body region 1R side region of the skin surface side surface of the absorber 8 toward the crotch region 1B side region, or directly enters these spaces S1 and S2. As a result, the sweat is immersed into and held in the region corresponding to these spaces in the skin-side surface of the absorber 8. Sweat flowing out of the spaces S1 and S2 without entering the areas corresponding to the spaces S1 and S2 is guided by the grooves 8SL and 8SR to enter the grooves 8SL and 8SR. As a result, such sweat is immersed into and held by the grooves 8SL and 8SR in the skin-side surface of the absorber 8. Therefore, sweat does not enter the region between the pair of grooves 8SL and 8SR, and erroneous detection of the indicator 16 can be further suppressed.

In the diaper 1 of the present embodiment, the interval W between the center lines of the grooves 8SL, 8SR is set to 20mm or more and 50mm or less, whereby the space S1 for accumulating urine and the space S2 for holding feces corresponding to the infant are formed in the region on the front region 1F side and the region on the rear region 1R side of the diaper 1, and the region between the pair of grooves 8SL, 8SR bulges toward the non-skin surface side in the region on the crotch region 1B side of the diaper 1 as these spaces S1, S2 are formed. The indicator 16 provided on the back sheet 7 is separated from the skin surface of the wearer by the region between the pair of grooves 8SL and 8SR being bulged toward the non-skin surface side. As a result, the sweat on the inner side in the width direction than the grooves 8SL, 8SR among the sweat generated in the crotch of the wearer is less likely to enter the region between the pair of grooves 8SL, 8SR on the skin surface side of the absorber 8. Therefore, erroneous detection by the indicator 16 can be further suppressed.

< modification of embodiment 5 >

Next, a diaper 1 according to a modification of embodiment 5 will be described. In the diaper 1 of embodiment 5, the grooves 8SL and 8SR penetrate the absorber 8 in the thickness direction, but the present invention is not limited to this. For example, in the diaper 1 of the present modification, the grooves 8SL and 8SR may be formed in a non-penetrating concave shape as in the diaper 1 of embodiment 2. The concave grooves may be formed only on the skin surface side surface of the absorber 8, only on the non-skin surface side surface of the absorber 8, or on both the skin surface side and the non-skin surface side surface of the absorber 8.

For example, when a pair of concave grooves are formed on the skin surface side surface of the absorber 8, sweat on the outer side in the width direction than the concave grooves among sweat generated by the wearer is blocked by or enters the concave grooves. As a result, the sweat does not penetrate into the region between the pair of concave grooves in the skin-side surface of the absorber 8. In addition, when a pair of concave grooves are formed on the surface of the absorber 8 on the non-skin surface side, sweat around the wearer on the non-skin surface side of the absorber 8 on the outer side in the width direction than the concave grooves is blocked by the concave grooves or enters the concave grooves. As a result, the sweat does not penetrate into the region between the pair of concave grooves in the non-skin-surface-side surface of the absorber 8. Therefore, erroneous detection of the indicator 16 can be suppressed.

In this way, the grooves 8SL, 8SR or the concave grooves can prevent or guide (control) the movement of sweat in the liquid excreted from the wearer. On the other hand, as described in embodiments 1 to 4, the movement of the grooves 8SL, 8SR or the concave grooves can be promoted (controlled) even for urine that is excreted in an amount greater than sweat.

In the diaper 1 according to embodiment 5, the neutral top sheet 29 is used, but the present invention is not limited to this. For example, in the diaper 1 of the present modification example, as in the diaper 1 of embodiment 3, a weakly acidic top sheet containing a pH adjusting component may be used. In addition, as in the diaper 1 of embodiment 1, a weakly acidic top sheet may be added to the skin surface side of the neutral top sheet 29. By making the top sheet in contact with the skin of the wearer weakly acidic, even if the back flow occurs as described in embodiment 1, the pH adjusting component of the top sheet can neutralize the alkali component such as ammonia contained in the liquid excreted from the wearer held by the absorber 8. Therefore, the skin of the wearer can be maintained neutral from weak acidity, and the occurrence of skin problems can be suppressed.

When a weakly acidic top sheet is used, the pH of sweat passing through the top sheet may change due to the pH adjusting component, and the indicator 16 may react due to the changed pH of sweat, resulting in erroneous detection. However, in the diaper 1 according to embodiment 5, by disposing the pair of grooves 8SL and 8SR so as to sandwich the portion of the absorber 8 corresponding to the indicator 16, sweat outside the grooves 8SL and 8SR in the width direction among sweat generated by the wearer does not penetrate into the region between the pair of grooves 8SL and 8SR on the skin surface side of the absorber 8. Therefore, even when a weakly acidic top sheet is used, erroneous detection of the indicator 16 can be suppressed. In addition, in the case where a pair of concave grooves is provided in the absorber 8 instead of the pair of grooves 8SL, 8SR (through grooves), erroneous detection of the indicator 16 can be suppressed as well.

< other embodiments >

Next, other embodiments will be described. In the diaper 1 according to embodiment 1 to embodiment 5, the grooves 8SL and 8SR, the grooves 8TL and 8TR, and the grooves 8UL and 8UR are formed to extend linearly in the longitudinal direction, but the present invention is not limited thereto. For example, in the case of the diaper 1 in plan view, the grooves 8SL, 8SR, the grooves 8TL, 8TR, or the grooves 8UL, 8UR may extend so as to curve outward in the width direction at both end sides in the longitudinal direction. The grooves 8SL, 8SR, 8TL, 8TR, or 8UL, 8UR may have a component in the longitudinal direction.

As described above, an object of the present disclosure is to provide an absorbent article that prevents a weak acidic property from being damaged by liquid excreted from the wearer when the property is imparted to a sheet that is in contact with the skin of the wearer.

Further, according to the present disclosure, by supporting the flat other sheet at a plurality of locations with the protruding portions protruding toward the other sheet in one of the 1 st sheet and the 2 nd sheet at intervals, a space is formed between the 1 st sheet and the 2 nd sheet, or the absorber is provided with the through holes penetrating in the thickness direction of the absorber, whereby the sheet in contact with the skin of the wearer can be prevented from being damaged by the liquid excreted from the wearer in the case where the weak acidic property is imparted to the sheet.

Another object of the present disclosure is to provide an absorbent article that suppresses erroneous detection of a urine detector due to bodily fluid of a wearer other than urine.

Further, according to the present disclosure, since the pair of grooves are provided in the absorbent body along the longitudinal direction of the absorbent body and are disposed so as to sandwich the portion of the absorbent body corresponding to the urine detection body from both sides in the width direction of the absorbent body, it is possible to suppress erroneous detection of the urine detection body due to body fluid of a wearer other than urine.

In addition, the present application includes the following supplementary notes.

< annex 1>

An absorbent article having a length along a longitudinal direction and a width along a width direction orthogonal to the longitudinal direction,

the absorbent article is provided with:

an absorber; and

a liquid-permeable sheet disposed closer to the wearer than the absorber and in contact with the skin of the wearer,

the absorbent body or the sheet has a configuration to control movement of liquid excreted from the wearer.

< additional note 2>

According to the absorbent article of appendix 1,

the sheet includes a 1 st sheet containing a pH adjusting component and a 2 nd sheet disposed between the 1 st sheet and the absorber,

By supporting the flat one of the 1 st and 2 nd sheets at a plurality of positions with a projection projecting toward the other sheet at intervals, a space is formed between the 1 st and 2 nd sheets as a structure for controlling movement of the liquid.

< additional note 3>

The absorbent article according to supplementary note 2, wherein the one sheet has a larger sheet area than the other sheet, and the one sheet is joined to the other sheet at a plurality of locations with a space therebetween.

< additional note 4>

According to the absorbent article of supplementary note 3,

the first sheet is the 1 st sheet, and the second sheet is the 2 nd sheet.

< by-note 5>

The absorbent article according to any one of the supplementary notes 2 to 4,

the absorber has a pair of grooves extending in a longitudinal direction as a structure for controlling movement of the liquid.

< additional note 6>

According to the absorbent article of supplementary note 5,

the absorbent article further includes a 1 st stretchable portion having a 1 st stretchable member disposed in an elongated state on an outer side of the pair of grooves in the width direction at a web-side end portion thereof and stretchable in the width direction.

< additional note 7>

According to the absorbent article of appendix 6,

the pair of grooves are disposed on the crotch side of the region corresponding to the urethral orifice.

< additional note 8>

According to the absorbent article of the supplementary note 7,

the absorbent article is used for infants and infants having a weight in a range of 5kg to 13kg, and the length of the abdomen-side end portions of the pair of grooves from the center in the longitudinal direction is in a range of 90mm to 100mm when the end portions in the longitudinal direction are overlapped and folded in half.

< additional note 9>

According to the absorbent article of the supplementary note 7,

the absorbent article is used for infants and infants having a weight in a range of 8kg to 15kg, and has a length of the abdomen-side end portions of the pair of grooves ranging from 85mm to 95mm when the longitudinal end portions are folded in half by overlapping the longitudinal end portions with each other.

< additional note 10>

According to the absorbent article of the supplementary note 7,

the absorbent article is used for infants and infants having a weight in a range of 11kg to 23kg, and has a length of the abdomen-side end portions of the pair of grooves from the center in the longitudinal direction in a range of 110mm to 120mm when the end portions in the longitudinal direction are overlapped and folded in half.

< additional note 11>

According to the absorbent article of the supplementary note 7,

the absorbent article is used for infants and infants having a weight in a range of 12kg to 29kg, and the length of the abdomen-side end portions of the pair of grooves from the center in the longitudinal direction is in a range of 100mm to 110mm when the end portions in the longitudinal direction are overlapped and folded in half.

< additional note 12>

According to the absorbent article of appendix 6,

the 1 st stretchable portion further includes a 2 nd stretchable member disposed in an extended state on an outer side of the pair of grooves in the width direction at a rear end portion thereof.

< additional note 13>

According to the absorbent article of the supplementary note 12,

the pair of grooves are disposed on the crotch side of the anus-corresponding region.

< additional note 14>

According to the absorbent article of appendix 13,

the absorbent article is used for infants and infants having a weight in a range of 5kg to 13kg, and the lengths of the back side ends of the pair of grooves from the center in the longitudinal direction are in a range of 40mm to 50mm when the ends in the longitudinal direction are overlapped and folded in half.

< additional note 15>

According to the absorbent article of appendix 13,

The absorbent article is used for infants and infants having a weight in a range of 8kg to 15kg, and has a length of 65mm to 75mm inclusive from the center in the longitudinal direction of the pair of grooves when the longitudinal end portions are folded in half by overlapping the longitudinal end portions.

< additional note 16>

According to the absorbent article of appendix 13,

the absorbent article is used for infants and infants having a weight in a range of 11kg to 23kg, and has a length of the back side end portions of the pair of grooves in a range of 40mm to 50mm when the longitudinal end portions are folded in half by overlapping the longitudinal end portions with each other.

< additional note 17>

According to the absorbent article of appendix 13,

the absorbent article is used for infants and infants having a weight in a range of 12kg to 29kg, and the lengths of the back side ends of the pair of grooves from the center in the longitudinal direction are in a range of 50mm to 60mm when the longitudinal ends are overlapped and folded in half.

< by note 18>

The absorbent article according to any one of supplementary notes 6 to 17,

The center lines of the pair of grooves are spaced from each other by 20mm to 50 mm.

< by-note 19>

The absorbent article according to any one of the supplementary notes 5 to 18,

the pair of grooves penetrate the absorber in the thickness direction.

< by note 20>

The absorbent article according to any one of the supplementary notes 5 to 18,

the pair of grooves are at least one of concave grooves provided on a surface of the absorber on the skin surface side of the wearer and recessed toward the opposite side from the skin surface side, and concave grooves provided on a surface of the absorber on the opposite side from the skin surface side and recessed toward the skin surface side.

< additional notes 21>

According to the absorbent article of the supplementary note 20,

the absorber has a through hole penetrating in a thickness direction of the absorber as a structure for controlling movement of the liquid.

< by note 22>

According to the absorbent article of the supplementary note 21,

the through hole is provided in at least one of the areas corresponding to the urethral orifice and the periphery of the area corresponding to the urethral orifice.

< additional notes 23>

The absorbent article according to any one of supplementary notes 5 to 22,

the absorbent article further includes a urine detector disposed on a side opposite to the skin surface side of the wearer from the absorber, and the pair of grooves are disposed so as to sandwich a portion of the absorber corresponding to the urine detector from both sides in the width direction of the absorber.

< annex 24>

According to the absorbent article of appendix 1,

the tablet comprises a pH-adjusting component,

< by-note 25>

According to the absorbent article of appendix 24,

< by-note 26>

According to the absorbent article of the supplementary note 24 or 25,

< by-note 27>

According to the absorbent article of the supplementary note 26,

< by-note 28>

According to the absorbent article of the supplementary note 27,

< additional notes 29>

According to the absorbent article of the supplementary note 28,

< annex 30>

According to the absorbent article of the supplementary note 28,

< additional notes 31>

According to the absorbent article of the supplementary note 28,

< by note 32>

According to the absorbent article of the supplementary note 28,

< additional notes 33>

According to the absorbent article of the supplementary note 27,

< additional note 34>

According to the absorbent article of the supplementary note 33,

< additional notes 35>

According to the absorbent article of the supplementary note 34,

< by note 36>

According to the absorbent article of the supplementary note 34,

< appendix 37>

According to the absorbent article of the supplementary note 34,

< additional note 38>

According to the absorbent article of the supplementary note 34,

< annex 39>

The absorbent article according to any one of supplementary notes 27 to 38,

< annex 40>

The absorbent article according to any one of supplementary notes 26 to 39,

the pair of grooves are the through holes.

< by-note 41>

The absorbent article according to any one of supplementary notes 26 to 39,

< annex 42>

The absorbent article according to any one of supplementary notes 26 to 41,

< by-note 43>

According to the absorbent article of appendix 1,

the absorbent article further comprises:

a urine detector disposed on a side opposite to the skin surface side of the wearer from the absorber; and

a pair of grooves provided in the absorber along a longitudinal direction of the absorber, the grooves being arranged so as to sandwich a portion of the absorber corresponding to the urine detector from both sides in a width direction of the absorber,

the pair of grooves are configured to control movement of the liquid.

< by note 44>

According to the absorbent article of the supplementary note 43,

the tablet comprises a pH adjusting ingredient.

Claims

1. An absorbent article having a length in a longitudinal direction and a width in a width direction orthogonal to the longitudinal direction, characterized in that,

The absorbent article is provided with:

an absorber (8);

a liquid-permeable 1 st sheet which is disposed closer to the wearer than the absorber (8) and is in contact with the skin of the wearer, and which contains a pH adjusting component; and

a liquid-permeable 2 nd sheet, wherein the liquid-permeable 2 nd sheet is disposed between the 1 st sheet and the absorber,

one of the 1 st sheet and the 2 nd sheet has a larger sheet area than the other sheet, and a space is formed between the 1 st sheet and the 2 nd sheet by supporting the other sheet, which is flat, at a plurality of positions with a space therebetween by protruding portions of the one sheet having a larger sheet area, which protrude toward the other sheet, and bonding the other sheet to the other sheet,

the absorber (8) has a pair of grooves extending in the longitudinal direction, the pair of grooves are arranged on the crotch side of the urethral orifice corresponding region (40),

the absorbent article further comprises a 1 st stretchable portion having a 1 st stretchable member arranged in an elongated state on the outer side in the width direction of the urethral orifice corresponding region (40) and the outer side in the width direction of the abdomen-side end portions of the pair of grooves and stretchable in the width direction,

The 1 st stretchable member disposed on the outer side in the width direction of the urethral orifice corresponding region (40) is disposed at a shorter interval than the 1 st stretchable member disposed on the outer side in the width direction of the abdomen-side end portions of the pair of grooves.

2. The absorbent article of claim 1, wherein the absorbent article comprises,

the first sheet is the 1 st sheet, and the second sheet is the 2 nd sheet.

3. The absorbent article of claim 1, wherein the absorbent article comprises,

the absorbent article is used for infants and infants having a weight in a range of from 5kg to 13kg, wherein the length (L1) of the abdomen-side end portions of the pair of grooves from the center in the longitudinal direction is in a range of from 90mm to 100mm when the end portions in the longitudinal direction are overlapped and folded in half.

4. The absorbent article of claim 1, wherein the absorbent article comprises,

the absorbent article is used for infants and infants having a weight in a range of 8kg to 15kg, wherein the length (L1) of the abdomen-side end parts of the pair of grooves from the center in the longitudinal direction is in a range of 85mm to 95mm when the end parts in the longitudinal direction are overlapped and folded in half.

5. The absorbent article of claim 1, wherein the absorbent article comprises,

the absorbent article is used for infants and infants having a weight in a range of from 11kg to 23kg, wherein the length (L1) of the abdomen-side end portions of the pair of grooves from the center in the longitudinal direction is in a range of from 110mm to 120mm when the end portions in the longitudinal direction are overlapped and folded in half.

6. The absorbent article of claim 1, wherein the absorbent article comprises,

the absorbent article is used for infants and infants having a weight in a range of 12kg to 29kg, and has a length (L1) of the abdomen-side end portions of the pair of grooves from the center in the longitudinal direction in a range of 100mm to 110mm when the end portions in the longitudinal direction are overlapped and folded in half.

7. The absorbent article of claim 1, wherein the absorbent article comprises,

8. The absorbent article as set forth in claim 7 wherein,

the pair of grooves are disposed on the crotch side of the anus corresponding region (30).

9. The absorbent article as in claim 8, wherein,

the absorbent article is used for infants and infants having a weight in a range of 5kg to 13kg, wherein the length (L4) of the back side end parts of the pair of grooves from the center in the longitudinal direction is in a range of 40mm to 50mm when the end parts in the longitudinal direction are overlapped and folded in half.

10. The absorbent article as in claim 8, wherein,

the absorbent article is used for infants and infants having a weight in a range of from 8kg to 15kg, wherein the length (L4) of the back side end parts of the pair of grooves from the center in the longitudinal direction is in a range of from 65mm to 75mm when the end parts in the longitudinal direction are overlapped and folded in half.

11. The absorbent article as in claim 8, wherein,

the absorbent article is used for infants and infants having a weight in a range of from 11kg to 23kg, wherein the length (L4) of the back side end parts of the pair of grooves from the center in the longitudinal direction is in a range of from 40mm to 50mm when the end parts in the longitudinal direction are overlapped and folded in half.

12. The absorbent article as in claim 8, wherein,

the absorbent article is used for infants and infants having a weight in a range of from 12kg to 29kg, wherein the length (L4) of the back side end parts of the pair of grooves from the center in the longitudinal direction is in a range of from 50mm to 60mm when the end parts in the longitudinal direction are overlapped and folded in half.

13. The absorbent article as in any of claims 1-12, wherein,

the interval (W) between the central lines of the pair of grooves is 20mm to 50 mm.

14. The absorbent article of claim 1, wherein the absorbent article comprises,

the pair of grooves penetrate the absorber (8) in the thickness direction.

15. The absorbent article of claim 1, wherein the absorbent article comprises,

the pair of grooves is at least one of a concave groove provided on a surface of the absorber (8) on the skin surface side of the wearer and recessed toward the side opposite to the skin surface side, and a concave groove provided on a surface of the absorber (8) on the side opposite to the skin surface side and recessed toward the skin surface side.

16. The absorbent article as in claim 15, wherein,

The absorber (8) has a through hole penetrating in the thickness direction of the absorber.

17. The absorbent article as in claim 16, wherein,

the through hole is provided in at least one of the areas (40) corresponding to the urethral orifice and the periphery of the area (40) corresponding to the urethral orifice.

18. The absorbent article of claim 1, wherein the absorbent article comprises,

the absorbent article further comprises a urine detector which is disposed on the opposite side of the absorber (8) from the skin surface side of the wearer, and the pair of grooves are disposed so as to sandwich the portion of the absorber (8) corresponding to the urine detector from both sides in the width direction of the absorber (8).

19. The absorbent article as claimed in claim 1 or 2, characterized in that,

the absorber (8) has a through hole penetrating in the thickness direction of the absorber (8).

20. The absorbent article as in claim 19, wherein,

21. The absorbent article as in claim 19, wherein,

22. The absorbent article as in claim 19, wherein,

23. The absorbent article as in claim 19, wherein,

24. The absorbent article as in claim 19, wherein,

25. The absorbent article as in claim 19, wherein,

26. The absorbent article as in claim 25, wherein,

27. The absorbent article as in claim 26, wherein,

28. The absorbent article as in claim 26, wherein,

29. The absorbent article as in claim 26, wherein,

30. The absorbent article as in claim 26, wherein,

31. The absorbent article as in claim 19, wherein,

32. The absorbent article as in claim 19, wherein,

the pair of grooves penetrate the absorber in the thickness direction.

33. The absorbent article as in claim 19, wherein,

the absorbent article further comprises a urine detector which is disposed on the opposite side of the absorber (8) from the skin surface side of the wearer, and the pair of grooves are disposed so as to sandwich the portion of the absorber corresponding to the urine detector from both sides in the width direction of the absorber.

34. The absorbent article as in claim 18, wherein,

the pair of grooves are configured to control movement of the liquid.