Shorts-type absorbent article

Abstract

The present invention relates to a pant-type absorbent article. In a pant-type absorbent article provided with a hydrophilic sheet to improve water absorbency, discomfort in the crotch portion when worn is suppressed. A pant-type absorbent article (1) has an absorbent main body (10) and a waist member (20) in which a front waist portion (20) and a rear waist portion (30) are joined in a ring shape by a pair of side joints (50) provided at both end portions in the left-right direction, the pant-type absorbent article (1) being provided with a pair of leg opening (LH), a hydrophilic region (32, 42) being provided at a position on the non-skin side farthest from at least a part of a region of the waist member (20) in which the pair of side joints (50) overlap in the up-down direction, a hydrophobic region (13b, 31, 41) being provided at a position on the non-skin side farthest from at least a part of a region of the leg opening (LH) located at the lowermost end (CL).

Description

Technical Field

[0001] This invention relates to a shorts-type absorbent article. Background Technology

[0002] It is known in the past that absorbent articles such as shorts-type disposable diapers can improve absorbency by using hydrophilic sheets in the sheet components constituting the absorbent article. For example, Patent Document 1 discloses a disposable diaper in which sheet components such as nonwoven fabric containing hydrophilic fibers are used for the skin-side sheet 5 located on the side of the wearer's skin and the outer layer sheet 4 located on the non-skin side.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-113186 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] In diapers using hydrophilic sheet components, moisture such as sweat can be easily absorbed from the wearer's skin during wear. However, when the hydrophilic sheet absorbs moisture, there is a possibility that the damp sheet may come into contact with the wearer's skin, causing problems such as rashes or discomfort. This is particularly true in the crotch area of ​​absorbent fabrics, where the damp sheet component can easily come into contact with the leg area when the wearer moves their legs, potentially leading to discomfort from a damp groin area.

[0008] The present invention was made in view of the existing problems as described above, and its object is to suppress discomfort in the crotch area when wearing shorts-type absorbent articles with improved absorbency due to the presence of hydrophilic sheets.

[0009] Solution for solving the problem

[0010] The main technical solution for achieving the above-mentioned objective is a shorts-type absorbent article having intersecting vertical, horizontal, and front-back directions. This shorts-type absorbent article has a waistband and a liquid-absorbing body. The waistband is formed by connecting a front waist section and a rear waist section in a ring shape using a pair of side joints located at both ends in the horizontal direction. The shorts-type absorbent article has a pair of leg openings for the wearer's legs to pass through. The shorts-type absorbent article is characterized in that a hydrophilic region is provided at least partially on the non-skin side of the area in the waistband that overlaps with the pair of side joints in the vertical direction, and a hydrophobic region with lower hydrophilicity than the hydrophilic region is provided at least at the non-skin side of the lowest portion of the area along the leg openings.

[0011] Other features of the invention will become apparent from the description and drawings herein.

[0012] The effects of the invention

[0013] According to the present invention, in shorts-type absorbent articles with improved absorbency due to the presence of hydrophilic sheets, discomfort in the crotch area during wear can be suppressed. Attached Figure Description

[0014] Figure 1 This is a rough 3D diagram of Diaper 1.

[0015] Figure 2 This is a top view of diaper 1 in its unfolded and extended state.

[0016] Figure 3 yes Figure 2 A rough cross-sectional view at line AA.

[0017] Figure 4A This is a top view of the absorbent body 10. Figure 4B This is a schematic cross-sectional view of the absorbent body 10.

[0018] Figure 5A , Figure 5B and Figure 5C This diagram illustrates the basic principles of moisture absorption and evaporation in diaper 1.

[0019] Figure 6A This is a diagram illustrating the experimental method used to measure the transpiration rate. Figure 6B It is a chart representing the transpiration rate data obtained from experimental results.

[0020] Figure 7A and Figure 7B This diagram illustrates the situation where the absorbent body 10 fits against the wearer's crotch area when wearing diaper 1.

[0021] Figure 8A and Figure 8B This figure illustrates the method of installing the waist elastic member 35 onto the front waist part 30 using the welded part 60.

[0022] Figure 9 This is a top view of diaper 2 in its unfolded and extended state.

[0023] Figure 10 yes Figure 9 A rough cross-sectional view at line B-B.

[0024] Figure 11 This is a top view of diaper 3 in its unfolded and extended state.

[0025] Figure 12 yes Figure 11 A rough cross-sectional view at the C-C line.

[0026] Figure 13 This is a top view of a modified example of diaper 3 in its unfolded and elongated state.

[0027] Figure 14 yes Figure 13 A rough cross-sectional view at line D-D.

[0028] Explanation of reference numerals in the attached figures

[0029] 1. Diaper (Shorts-type absorbent article) (First Embodiment); 2. Diaper (Shorts-type absorbent article) (Second Embodiment); 3. Diaper (Shorts-type absorbent article) (Third Embodiment); 10. Absorbent body; 11. Absorbent core; 11b. Core packing sheet; 11c. Narrowing section; 12. Top sheet; 13. Bottom sheet; 13a. Liquid-proof sheet; 13b. Outer sheet; 15. Leak-proof wall section; 16. Leak-proof wall elastic member; 17. Leg opening elastic member; 20. Waist section; 21. Skin side sheet (hydrophobic nonwoven fabric); 22. Non-skin side sheet (hydrophilic nonwoven fabric); 30. Front waist section; 30sw. Side section; 31. Skin side sheet (hydrophobic nonwoven fabric); 32. Non-skin side sheet (hydrophilic nonwoven fabric) Water-based nonwoven fabric); 32f, fold-back section; 32h, opening section; 35, waist elastic member; 36, skin-feeling sheet; 40, rear waist section; 40b, buttock cover; 40sw, side section; 41, skin-feeling side sheet (hydrophobic nonwoven fabric); 42, non-skin-feeling side sheet (hydrophilic nonwoven fabric); 42f, fold-back section; 42h, opening section; 45, waist elastic member; 46, skin-feeling sheet; 47, bending elastic member; 50, side joint; 60, welded section; 60s, welded section pair; 71, first area; 71f, front leg circumference area; 71r, rear leg circumference area; 72, second area (crotch leg circumference area); BH, waist opening; LH, leg circumference opening; CL, central position (longitudinal, length direction). Detailed Implementation

[0030] Based on the description in this specification and the accompanying drawings, at least the following become clear.

[0031] A shorts-type absorbent article having intersecting vertical, horizontal, and front-back directions, comprising a waistband and a liquid-absorbing body. The waistband is formed by a pair of side joints at both ends in the horizontal direction, which annularly join a front waist portion and a rear waist portion. The shorts-type absorbent article has a pair of leg openings for the wearer's legs to pass through. The shorts-type absorbent article is characterized in that a hydrophilic region is provided at least partially on the non-skin side of the area in the waistband that overlaps with the pair of side joints in the vertical direction, and a hydrophobic region with lower hydrophilicity than the hydrophilic region is provided at least at the non-skin side of the lowermost portion of the area along the leg openings.

[0032] This type of shorts-shaped absorbent garment utilizes a hydrophilic area on the non-skin side of the waistband to absorb moisture from the wearer's skin and allow the absorbed moisture to evaporate into the atmosphere. Furthermore, when wearing the absorbent garment, the lowest point of the leg opening that contacts the wearer's crotch becomes a hydrophobic area, thus preventing the wearer's crotch from getting wet. Therefore, moisture is less likely to come into contact with the wearer's skin, particularly reducing discomfort in the crotch area.

[0033] For this shorts-type absorbent article, preferably, the front waist portion is joined to one side in the longitudinal direction of the unfolded absorbent body, and the rear waist portion is joined to the other side in the longitudinal direction. A hydrophilic nonwoven fabric is provided at the position closest to the non-skin side of at least one of the front waist portion and the rear waist portion, and a hydrophobic nonwoven fabric with lower hydrophilicity than the hydrophilic nonwoven fabric is provided at the position closest to the non-skin side of the absorbent body.

[0034] According to this type of shorts-shaped absorbent garment, in a shorts-shaped absorbent garment with a three-piece structure, a hydrophobic nonwoven fabric is used as the outermost sheet component of the absorbent body that comes into contact with the wearer's crotch area. As a result, the crotch area is less likely to get wet when worn, and the wearer is less likely to experience discomfort.

[0035] For this shorts-type absorbent article, preferably, the waist member is integrally formed in the unfolded state with the front waist part and the rear waist part being continuous in the longitudinal direction. The waist member is joined to the non-skin side of the absorbent body. A hydrophilic nonwoven fabric is provided at the position closest to the non-skin side of the waist member, and a hydrophobic nonwoven fabric with lower hydrophilicity than the hydrophilic nonwoven fabric is provided at the position closest to the non-skin side of the absorbent body. In the left-right direction, the minimum width of the waist member is smaller than the minimum width of the absorbent body.

[0036] According to such shorts-type absorbent articles, in shorts-type absorbent articles with a two-piece structure, hydrophobic nonwoven fabric is used as the outermost sheet component of the absorbent body that contacts the wearer's crotch, so that the crotch is not easily wetted when worn, and the wearer is less likely to experience discomfort.

[0037] For this shorts-type absorbent article, preferably, in the left-right direction, the distance between the outermost end of the absorbent body and the innermost end of the waist member is less than 1 / 2 of the distance between the outermost end of the waist member and the innermost end of the waist member.

[0038] This type of shorts-shaped absorbent garment prevents the side edges (lower leg area) of the absorbent body from excessively protruding outwards in the left and right directions. As a result, the wearer can move their legs more easily when wearing the absorbent garment, and it also reduces discomfort around the legs.

[0039] For this shorts-type absorbent article, preferably, the leg opening has a first region formed by the waist member and a second region formed by the absorbent body at the lower end of the side joint and at a position lower than the lower end, wherein the portion of the first region closest to the non-skin side is a hydrophilic region and the portion of the second region closest to the non-skin side is a hydrophobic region.

[0040] Based on this type of shorts-shaped absorbent garment, in the leg openings of shorts-shaped absorbent garments with three-piece or two-piece constructions, moisture easily evaporates in the first area, while moisture is not easily retained in the second area that comes into contact with the wearer's crotch, thus preventing the wearer's crotch from becoming damp. Therefore, discomfort is less likely to occur to the wearer over a larger area of ​​the crotch.

[0041] For this shorts-type absorbent article, it is preferable that the length of the portion of the shorts-type absorbent article in the longitudinal direction along the second region, which is forward of the central position, is greater than the length of the portion along the second region, which is backward of the central position.

[0042] Because of the large hydrophobic area on the front of the crotch area within the leg opening of this type of shorts-shaped absorbent garment, the leg opening does not easily become wet, even when the wearer moves their legs forward, such as while walking. Therefore, it is less likely to cause discomfort to the wearer.

[0043] For this shorts-type absorbent article, it is preferable that the length of the portion of the shorts-type absorbent article in the longitudinal direction along the first region, which is located behind the central position, is greater than the length of the portion along the first region, which is located in the front position.

[0044] Based on this type of absorbent shorts, the rear leg area, which is in a large area of ​​contact with the wearer's buttocks and is subject to body pressure when the wearer sits down, has a large hydrophobic area, so the buttocks are not easily wetted and the wearer is less likely to experience discomfort.

[0045] For this shorts-type absorbent article, preferably, the front waist portion has a front skin side panel and a front non-skin side panel, and the rear waist portion has a rear skin side panel and a rear non-skin side panel. The front skin side panel and the rear skin side panel are continuous, integral sheet components in the longitudinal direction when unfolded, while the front non-skin side panel and the rear non-skin side panel are discontinuous, independent sheet components in the longitudinal direction when unfolded. The waist component is joined to the non-skin side of the absorbent body. The independent sheet components constituting the front and rear non-skin side panels are hydrophilic nonwoven fabrics, and the integral sheet component constituting the front and rear skin side panels is a hydrophobic nonwoven fabric with lower hydrophilicity than the hydrophilic nonwoven fabric.

[0046] Based on such shorts-type absorbent items, in shorts-type absorbent items with a simple three-piece structure, hydrophobic non-woven fabric is used as the outermost sheet component (one-piece sheet component) that comes into contact with the wearer's crotch area, so that the crotch area is not easily wetted when worn, and the wearer is less likely to experience discomfort.

[0047] For this shorts-type absorbent article, preferably, in the left-right direction, the minimum width of the waist member is greater than the minimum width of the absorbent body, and the leg opening has a first region and a second region located below the lower end of the side joint. The first region is formed by the waist member and is configured to include the front non-skin side piece and the rear non-skin side piece. The second region does not include the front non-skin side piece and is formed by the front skin side piece and the rear skin side piece. The portion of the first region closest to the non-skin side is a hydrophilic region, and the portion of the second region closest to the non-skin side is a hydrophobic region.

[0048] Based on this type of shorts-shaped absorbent garment, in the leg opening of the shorts-shaped absorbent garment with a simple three-piece structure, moisture easily evaporates in the first area, while moisture is not easily retained in the second area that comes into contact with the wearer's crotch, thus preventing the wearer's crotch from becoming damp. Therefore, it is less likely to cause discomfort to the wearer over a larger area of ​​the crotch.

[0049] For this shorts-type absorbent article, it is preferable that the sheet member disposed in the second region at a position closer to the non-skin side than the absorbent body is only a single piece of the hydrophobic nonwoven fabric.

[0050] Based on this type of absorbent shorts, the skin around the crotch area where the leg openings are open is softer when wearing the absorbent garment, allowing the wearer to feel comfortable.

[0051] For this shorts-type absorbent article, preferably, in the left-right direction, the minimum width of the waist member is smaller than the minimum width of the absorbent body, and the leg opening has a first region formed by the waist member and a second region formed by the absorbent body at the lower end of the side joint and at a position lower than the lower end, wherein the portion of the first region closest to the non-skin side is a hydrophilic region and the portion of the second region closest to the non-skin side is a hydrophobic region.

[0052] Based on this type of shorts-shaped absorbent garment, in the leg opening of the shorts-shaped absorbent garment with a simple three-piece structure, moisture easily evaporates in the first area, while moisture is not easily retained in the second area that comes into contact with the wearer's crotch, thus preventing the wearer's crotch from becoming damp. Therefore, it is less likely to cause discomfort to the wearer over a larger area of ​​the crotch.

[0053] For this shorts-type absorbent article, it is preferable that the length of the portion of the shorts-type absorbent article in the longitudinal direction along the second region, which is forward of the central position, is greater than the length of the portion along the second region, which is backward of the central position.

[0054] Because of the large hydrophobic area on the front of the crotch area within the leg opening of this type of shorts-shaped absorbent garment, the leg opening does not easily become wet, even when the wearer moves their legs forward, such as while walking. Therefore, it is less likely to cause discomfort to the wearer.

[0055] For this shorts-type absorbent article, it is preferable that the length of the portion of the shorts-type absorbent article in the longitudinal direction along the first region, which is located behind the central position, is greater than the length of the portion along the first region, which is located in the front position.

[0056] Based on this type of absorbent shorts, the rear leg area, which is in a large area of ​​contact with the wearer's buttocks and is subject to body pressure when the wearer sits down, has a large hydrophobic area, so the buttocks are not easily wetted and the wearer is less likely to experience discomfort.

[0057] For this type of absorbent shorts, it is preferable that the outermost non-skin-contact layer of the front waist section and the outermost non-skin-contact layer of the rear waist section are each composed of a single piece of hydrophilic nonwoven fabric.

[0058] In this type of shorts-shaped absorbent garment, the non-skin-facing sides of the front and back waist sections are each made of a single sheet of hydrophilic nonwoven fabric. This creates a large hydrophilic area on both sides, further enhancing transpiration. Furthermore, the absence of excess sheet material minimizes obstruction of moisture absorption and transpiration, allowing for more efficient moisture release.

[0059] For this shorts-type absorbent article, it is preferable that the rear waist portion has a hip cover located below the lower end of the side joint, the width of the hip cover in the left-right direction narrows as it moves from the upper side to the lower side in the up-down direction, and an elastic member is provided that stretches along the end edge of the hip cover.

[0060] This type of shorts-shaped absorbent garment allows for easy evaporation of sweat and other moisture from the wearer's buttocks using a hip bra. Furthermore, the elasticity of the elastic members in the hip bra ensures a snug and comfortable fit when wearing the absorbent garment, preventing the hip area from rolling up. This minimizes any unnatural or uncomfortable feeling for the wearer.

[0061] ===First Implementation Method===

[0062] As an example of the shorts-type absorbent article of the present invention, a shorts-type disposable diaper (hereinafter also referred to as "diaper 1") will be described. However, the shorts-type absorbent article of the present invention also includes shorts-type sanitary napkins and other shorts-type absorbent articles.

[0063] <Structure of Diaper 1>

[0064] Figure 1 This is a rough 3D diagram of Diaper 1. Figure 2 This is a top view of diaper 1 in its unfolded and extended state. Figure 3 yes Figure 2 A schematic cross-sectional view at line AA. Furthermore, the “stretched state” of diaper 1 refers to the state in which the diaper 1 as a whole (the product as a whole) is stretched to a wrinkle-free state, specifically, it refers to the state in which the dimensions of each component constituting diaper 1 (such as the absorbent body 10, waist member 20, etc., described later) are the same as or close to the dimensions of the individual component.

[0065] exist Figure 1 In the shorts-style configuration shown, the diaper 1 has intersecting vertical, horizontal, and front-back directions, and includes a waist opening (BH) and a pair of leg openings (LH, LH). The upper side of the vertical opening (BH) corresponds to the waist opening (BH), and the lower side corresponds to the crotch area. Furthermore, the front side of the front opening (LH) corresponds to the wearer's abdomen, and the back side corresponds to the wearer's back. Additionally, in... Figure 2 In its unfolded state, diaper 1 has intersecting longitudinal and transverse directions. The longitudinal direction is along... Figure 1 The vertical direction corresponds to the length direction of the absorbent body 10. The horizontal direction is along... Figure 1 The left and right directions within. Additionally, such as... Figure 3As shown, the direction in which the materials constituting diaper 1 are layered is defined as the thickness direction. The side in the thickness direction that comes into contact with the wearer's skin is defined as the skin side, and the opposite side is defined as the non-skin side.

[0066] The diaper 1 has an absorbent body 10 for absorbing liquid and a waist member 20 disposed on the non-skin side of the absorbent body 10. Furthermore, the waist member 20 has a front waist portion 30 corresponding to the front part of the diaper 1 and a rear waist portion 40 corresponding to the back part of the diaper 1. That is, the diaper 1 of the first embodiment is a so-called three-piece shorts-type diaper, which has an absorbent body 10 as a first component that fits snugly against the wearer's crotch and absorbs urine and other excrement, a front waist portion 30 as a second component that covers the wearer's abdominal side, and a rear waist portion 40 as a third component that covers the wearer's back side.

[0067] exist Figure 2 In its unfolded state, with the front waist section 30 and the rear waist section 40 arranged parallel to each other at intervals along the longitudinal direction, the absorbent body 10 is positioned between them. The ends 10ea and 10eb of the absorbent body 10 along its length (longitudinal direction) are respectively joined and fixed to the skin side of the waist section 30 and 40 nearby. The diaper 1 has an approximate H-shape when viewed from above. Furthermore, the absorbent body 10 is folded in half from this state with the longitudinal center position CL as the fold line. In this folded state, the side portions 30sw and 40sw of the front waist section 30 and the rear waist section 40, which are opposite each other, join and connect with each other in the left and right directions, thereby forming a pair of side joints 50, 50. That is, the front waist section 30 and the rear waist section 40 are formed into a ring shape by the pair of side joints 50, 50. Furthermore, the side joints 50 are formed by known joining methods such as welding and bonding. This results in... Figure 1 The diaper 1 shown is in a shorts-like configuration, with a waist opening BH and a pair of leg openings LH, LH. Furthermore, in this configuration, the center position CL, which is the fold line of the diaper 1, is the lowest point in the vertical direction of the leg openings LH. In this specification, the term "center position CL in the longitudinal direction of the unfolded state" for the diaper 1 is used interchangeably with "lowest point in the vertical direction of the shorts-like state" for the diaper 1.

[0068] The leg opening LH of the diaper 1 is formed by the waist member 20 and a part of the absorbent body 10 at a position lower than the side joint 50 in the vertical direction (including the lower end of the side joint 50). Specifically, the area surrounded by the lower edge of the front waist part 30, the lower edge of the rear waist part 40, and the two side edges of the absorbent body 10 in the horizontal direction is called the leg opening LH.

[0069] Below, in Figure 2The area along the leg opening LH, indicated by the diagonal lines, is further divided into two regions: the area formed by the lower edge of the front waist portion 30 is also called the front leg opening region 71f, and the area formed by the lower edge of the rear waist portion 40 is also called the rear leg opening region 71r. Both the front leg opening region 71f and the rear leg opening region 71r are collectively referred to as "Region 71". The area formed by the side edge of the absorbent body 10 is also called the crotch leg opening region 72. This crotch leg opening region 72 is also referred to as "Region 72". Furthermore, "the area along the leg opening LH" refers to an area with a predetermined width (e.g., approximately 5 mm) extending inward from the periphery (edge) of the leg opening LH.

[0070] (Absorbent Subject 10)

[0071] Figure 4A This is a top view of the absorbent body 10. Figure 4B This is a schematic cross-sectional view of the absorbent body 10. The absorbent body 10 has an absorbent core 11 for absorbing excrement, a top sheet 12 disposed on the skin side in the thickness direction of the absorbent core 11, and a bottom sheet 13 disposed on the non-skin side of the absorbent core 11. However, the absorbent body 10 may also have sheet members other than the sheet members described above. For example, the absorbent body 10 may also have a second sheet (not shown) between the top sheet 12 and the absorbent core 11 in the thickness direction.

[0072] The absorbent core 11 is a component that absorbs and retains excretory fluids such as urine, and is formed, for example, from liquid-absorbent fibers such as pulp fibers incorporating highly absorbent polymers (SAP). Furthermore, the outer peripheral surface of the absorbent core 11 can also be covered by a liquid-permeable sheet component (core sheet 11b) such as cotton paper or nonwoven fabric. In this embodiment, the absorbent core 11 has a narrowed portion 11c, which narrows in width in the left-right direction, between its front and rear ends in the longitudinal direction, and has the following characteristics: Figure 4A The top view shows a roughly hourglass shape. The narrow section 11c is the part that sits between the wearer's legs when the diaper 1 is worn; this section is shorter (narrower) in the lateral direction, allowing the absorbent core 11 to easily conform to the wearer's crotch. Furthermore, although in this embodiment it becomes as... Figure 4B The absorbent core 11 is in a state where two layers overlap in the thickness direction, but the shape of the absorbent core 11 is not limited to this.

[0073] The top sheet 12 is a liquid-permeable sheet, such as a hydrophilic hot-air nonwoven fabric or spunbond nonwoven fabric. In this embodiment, for example... Figure 4B In this way, the two sides of the top sheet 12 in the left and right directions are folded back towards the non-skin side to roll in the absorbent core 11.

[0074] The substrate 13 has a two-layer structure formed by an impermeable liquid sheet 13a and a hydrophobic outer sheet 13b disposed on the non-skin side of the impermeable liquid sheet 13a. As the impermeable liquid sheet 13a, a resin film or the like is used, and as the outer sheet 13b, a soft, hydrophobic nonwoven fabric is used, for example.

[0075] A pair of leak-proof wall portions 15 are provided on both sides of the absorbent body 10 in the left-right direction along the longitudinal direction (the length direction of the absorbent body 10). In this embodiment, the leak-proof wall portions 15 are formed by the aforementioned outer sheet 13b. Specifically, in the left-right direction (lateral direction), a portion of the outer sheet 13b extends to a position further outward than both ends of the absorbent core 11, and as... Figure 4B The diaper bends towards the skin at multiple points, thus forming a pair of leak-proof wall portions 15. Leak-proof elastic members 16, such as elastic bands, are installed at the skin-side end (front end) of the leak-proof wall portions 15 in a longitudinal (length direction of the absorbent body 10) state. When the diaper 1 is worn, based on the elasticity of these leak-proof elastic members 16, the leak-proof wall portions 15 stand upright towards the wearer's skin and conform to the wearer's crotch area.

[0076] In addition, elastic leg bands and other leg elastic members 17 are installed on both sides of the absorbent body 10 in the left-right direction, extending longitudinally (the length direction of the absorbent body 10). When wearing the diaper 1, based on the elasticity of the leg elastic members 17, the two sides of the absorbent body 10 contract and easily fit along the wearer's leg circumference.

[0077] (Front waist 30)

[0078] like Figure 3 As shown, the front waist portion 30 has a skin side sheet 31 positioned closest to the skin in the thickness direction, a non-skin side sheet 32 ​​stacked adjacent to the skin side sheet 31 on the non-skin side, and a waist elastic member 35 disposed between the skin side sheet 31 and the non-skin side sheet 32 ​​in the thickness direction. The front waist portion 30 is basically a two-layer structure with the skin side sheet 31 and the non-skin side sheet 32, but the front waist portion 30 may also have a partial structure with three or more layers, such as the skin sheet 36 described later.

[0079] Skin side panel 31 and non-skin side panel 32 are as follows Figure 2The sheet material shown, when viewed from above, is rectangular in shape and is formed, for example, from SMS nonwoven fabric. Furthermore, in diaper 1, the sheet material (nonwoven fabric) constituting the non-skin side panel 32 has a higher hydrophilicity than the sheet material (nonwoven fabric) constituting the skin side panel 31. That is, the skin side panel 31 is made of a nonwoven fabric with lower hydrophilicity (hereinafter also referred to as "hydrophobic nonwoven fabric"), while the non-skin side panel 32 is made of a nonwoven fabric with higher hydrophilicity than the skin side panel 31 (hereinafter also referred to as "hydrophilic nonwoven fabric"). Details regarding the hydrophilicity of each panel 31 and 32, and the functions based on the difference in hydrophilicity, will be explained later.

[0080] In addition, multiple such features are provided on the surface of the non-skin side sheet 32. Figure 2 The enlarged view shows the opening 32h. The opening 32h is a through-hole extending through the non-skin side panel 32 along its thickness direction. By providing this opening 32h, the breathability of the front waist section 30 can be improved. Furthermore, the opening 32h is configured to be visually identifiable from the non-skin side of the front waist section 30, thereby easily reminding the user that the front waist section 30 has good breathability. Each opening 32h can, for example, be a circular shape with a diameter of approximately 1 mm, but the shape and arrangement (number and pattern) of the opening 32h can be appropriately changed. In addition, in the diaper 1, no through-holes equivalent to the opening 32h are provided on the skin side panel 31.

[0081] In this embodiment, the front waist portion 30 has a folded-back portion 32f, which is formed by folding back the upper end (front end in the longitudinal direction) of the non-skin side piece 32 from the non-skin side to the skin side and from the front to the rear in the longitudinal direction. This folded-back portion 32f covers a portion (upper end) of the skin side piece 31, thereby preventing the upper edge of the skin side piece 31 from getting stuck into the wearer's skin. However, it is not necessarily required to provide the folded-back portion 32f.

[0082] Multiple elastic waist members 35 are arranged vertically between the skin side panel 31 and the non-skin side panel 32, and are installed between the skin side panel 31 and the non-skin side panel 32 in a horizontally elongated state. Utilizing the elasticity of the elastic waist members 35, the front waist section 30 conforms to the wearer's abdominal waist.

[0083] The waist elastic member 35 can be installed using adhesives such as hot melt adhesives. For example, hot melt adhesive is applied to the waist elastic member 35, causing it to elongate at a predetermined elongation ratio, and then sandwiched between the skin side piece 31 and the non-skin side piece 32, thereby installing the waist elastic member 35. That is, the skin side piece 31 and the non-skin side piece 32 are joined together via the waist elastic member 35 using adhesive. Alternatively, the waist elastic member 35 can be installed either by applying adhesive to the skin side piece 31 and the non-skin side piece 32, or by the welding method using the welding section 60 described later.

[0084] Additionally, the front waist section 30 may also have a skin panel 36. For example... Figure 3 As shown, the skin sheet 36 is a sheet member configured to cover the upper end (front end in the longitudinal direction) of the absorbent body 10 from the skin side, and functions as a cover sheet. This prevents the upper edge of the absorbent body 10 from getting stuck into the wearer's skin when the diaper 1 is worn. The skin sheet 36 is formed, for example, from SMS nonwoven fabric. Furthermore, it is not necessarily required to provide a skin sheet 36.

[0085] In the front waist section 30 of this embodiment, when sheet members are provided at positions closer to the skin side than the skin side sheet 31 or closer to the non-skin side sheet 32, each sheet is configured to cover only a portion of the skin side sheet 31 and the non-skin side sheet 32. For example, Figure 3 The skin face piece 36 is configured to cover only a portion of the skin side of the skin side piece 31, so that at least a portion of the skin side piece 31 is exposed on the wearer's skin side.

[0086] (Rear waist 40)

[0087] The rear waist section 40 has a structure substantially the same as that of the front waist section 30. Specifically, the rear waist section 40 has a skin-side sheet 41 positioned closest to the skin in the thickness direction, a non-skin-side sheet 42 stacked adjacent to the skin-side sheet 41 on its non-skin-side, and a waist elastic member 45 disposed between the skin-side sheet 41 and the non-skin-side sheet 42 in the thickness direction. Furthermore, similar to the front waist section 30, the rear waist section 40 may also have an opening 42h, a folded-back portion 42f, and a skin-side sheet 46, etc. (see reference). Figure 2 , Figure 3 Since the structure of each component is roughly the same as that of the components of the front waist section 30, the description is omitted.

[0088] On the other hand, the shape of the rear waist section 40 differs from that of the front waist section 30. Specifically, as... Figure 2Thus, the rear waist section 40 has a hip cover 40b that is approximately trapezoidal in shape in the vertical direction, lower than the side joint section 50 (side section 40sw). The width of the hip cover 40b in the horizontal direction narrows from the upper side to the lower side in the vertical direction, and its outer edge (corresponding to the rear leg circumference area 71r) is curved. By providing the hip cover 40b, the rear waist section 40 can cover the wearer's buttocks more extensively when wearing the diaper 1.

[0089] Additionally, the buttock bra 40b is equipped with... Figure 2 The elastic band and other flexible members 47 are shown. The flexible elastic members 47 are installed between the skin side piece 41 and the non-skin side piece 42 in a state of elongation along the end edge of the buttock cover 40b. The elasticity of the flexible elastic members 47 makes it easy for the buttock cover 40b of the back waist part 40 to fit the wearer's buttocks when wearing the diaper 1, and also makes it less likely for the buttock cover 40b to roll up from the buttocks.

[0090] <Regarding the hydrophilicity of sheet components>

[0091] The hydrophilicity of the sheet components will be explained here. In diaper 1, hydrophobic nonwoven fabric is used as the skin side sheets 31 and 41 constituting the waist component 20 (front waist part 30, back waist part 40), and hydrophilic nonwoven fabric with higher hydrophilicity than hydrophobic nonwoven fabric is used as the non-skin side sheets 32 and 42. In addition, hydrophobic nonwoven fabric is also used as the outer sheet 13b constituting the absorbent body 10.

[0092] The hydrophilic nonwoven fabric of this embodiment is a nonwoven fabric whose hydrophilicity is improved by treating a hydrophobic nonwoven fabric with a predetermined oil agent (hydrophilic treatment). As the oil agent used in the hydrophilic treatment, commercially available oil agents that are effective as antistatic agents for fibers, such as anionic oil agents, nonionic oil agents, and mixtures thereof, can be used. These oil agents are added to an oil tank and supplied using an oil supply roller or the like, thereby improving the hydrophilicity of the hydrophobic nonwoven fabric and obtaining a hydrophilic nonwoven fabric. However, hydrophilic nonwoven fabrics can also be formed by other methods. For example, a hydrophilic nonwoven fabric can also be obtained by using fibers with high hydrophilicity to manufacture the nonwoven fabric.

[0093] Furthermore, in this embodiment, the entire nonwoven fabric constituting the non-skin side sheet 32 ​​is hydrophilically treated to improve the overall hydrophilicity of the non-skin side sheet 32. However, it is also possible to improve the hydrophilicity of only a local area of ​​the non-skin side sheet 32. For example, a sheet component with locally highly hydrophilic portions and locally less hydrophilic portions can be formed by hydrophilically treating only a local area of ​​the non-skin side sheet 32.

[0094] The hydrophilicity of the sheet component can be evaluated by measuring the contact angle when ion-exchanged water comes into contact with the surface of the sheet component. Specifically, if the contact angle between the hydrophilic nonwoven fabric and ion-exchanged water is smaller than that between the hydrophobic nonwoven fabric and ion-exchanged water, then the hydrophilic nonwoven fabric has higher hydrophilicity than the hydrophobic nonwoven fabric. As the hydrophilic nonwoven fabric (non-skin side sheet 32) used in this embodiment, its contact angle with ion-exchanged water is preferably 90 degrees or less, more preferably 50 degrees or less. On the other hand, as the hydrophobic nonwoven fabric (skin side sheet 31), its contact angle with ion-exchanged water is preferably 90 degrees or more, more preferably 120 degrees or more.

[0095] For example, the contact angle can be measured using the MCA-J contact angle meter manufactured by Kyowa Interface Science Co., Ltd., by the following method: First, drop approximately 20 picoliters of ion-exchanged water onto the surface of the fibers constituting the sheet member to be measured (the sheet being measured), and then immediately measure the contact angle using the contact angle meter. Measurements are taken at multiple locations (e.g., five or more locations) on the surface of the sheet being measured, and the average value is taken as the contact angle. Furthermore, the ambient temperature for measurement is set to 22°C.

[0096] Alternatively, one can photograph the measured piece with ion-exchanged water dropped on it from a cross-sectional view, analyze the captured image, and measure the angle between the ion-exchanged water droplet and the measured piece to measure the contact angle.

[0097] <On water absorption and transpiration>

[0098] The mechanism by which a diaper 1 made of hydrophilic nonwoven fabric absorbs moisture such as sweat from the wearer's skin and causes the absorbed moisture to evaporate into the atmosphere is explained. Figures 5A-5C This diagram illustrates the basic principle of moisture absorption and evaporation in diaper 1. Figures 5A-5C The diagram schematically shows a cross-section of the front waist section 30 of the components constituting the diaper 1.

[0099] First, such as Figure 5A As shown, when the wearer wears diaper 1, the skin side panel 31 (hydrophobic nonwoven fabric) of the front waist section 30, positioned on the skin side in the thickness direction, comes into contact with the wearer's skin. As described above, the skin side panel 31 of this embodiment is made of SMS nonwoven fabric and contains meltblown fibers with a fiber diameter finer than that of spunbond fibers. Therefore, the skin side panel 31 has a portion where the finer meltblown fibers are densely interwoven and the distance between the fibers is narrow. According to this structure, capillary action is generated in the skin side panel 31, thereby easily absorbing moisture such as sweat adhering to the wearer's skin.

[0100] Next, as Figure 5BAs shown, moisture absorbed by the skin-side sheet 31 is transferred to the non-skin-side sheet 32 ​​(hydrophilic nonwoven fabric), which is layered adjacent to the skin-side sheet 31 on the non-skin side. This is because, since the skin-side sheet 31 is a hydrophobic nonwoven fabric, while the non-skin-side sheet 32 ​​is a hydrophilic nonwoven fabric, a difference in hydrophilicity (hydrophilic gradient) is created between the two sheets. Moisture easily moves from the less hydrophilic skin-side sheet 31 to the more hydrophilic non-skin-side sheet 32. Therefore, moisture is difficult to retain on the skin-side sheet 31, which is in contact with the wearer's skin, and is easier to retain on the non-skin-side sheet 32, which is not in contact with the wearer's skin.

[0101] Moisture retained in the non-skin side 32 evaporates from the non-skin side of the non-skin side 32 into the atmosphere. For example... Figure 5C As shown, when no other components (sheet components) are disposed on the non-skin side of the non-skin side sheet 32, the entire surface of the non-skin side of the non-skin side sheet 32 ​​faces the atmosphere. That is, the interface area between the non-skin side sheet 32 ​​and the atmosphere becomes larger, thereby making it easier for moisture to evaporate.

[0102] In this way, within the waistband 20 of the diaper 1, moisture absorbed from the wearer's skin by the hydrophobic nonwoven fabric is transferred to the hydrophilic nonwoven fabric on the non-skin side, and released into the atmosphere from the non-skin side surface of the hydrophilic nonwoven fabric. That is, it can absorb moisture and efficiently evaporate it into the atmosphere. Therefore, moisture does not easily come into contact with the wearer's skin, thereby preventing the wearer's skin from becoming damp and causing skin problems such as rashes or discomfort.

[0103] Figure 6A , Figure 6B The results of a verification experiment on the evaporation of such water are shown. Figure 6A This is a diagram illustrating the experimental method used to measure the transpiration rate. Figure 6B It is a chart representing the transpiration rate data derived from experimental results.

[0104] The experiment was conducted according to the evaporation (II) test specified in ISO 17617 Method B. First, two sheet components were stacked, and three test specimens (test pieces) of predetermined sizes were prepared (1-3). Specimen 1 was formed by stacking two layers of hydrophobic spunbond nonwoven fabric A (15 gsm area weight). Specimen 2 was formed by stacking hydrophilic spunbond nonwoven fabric B (20 gsm area weight) on top of spunbond nonwoven fabric A. Specimen 3 was formed by stacking hydrophilic spunbond nonwoven fabric B (20 gsm area weight) on top of hydrophobic meltblown nonwoven fabric C (13 gsm area weight).

[0105] Next, as Figure 6AAs shown, 1 cc of physiological saline was added to a petri dish to form a droplet, and the sample was placed on top of the droplet. The total weight of the sample and the petri dish immediately after sample preparation was measured and recorded. Subsequently, the total weight of the sample and the petri dish was measured at predetermined intervals, and the rate of weight loss since the initial measurement was calculated as the transpiration rate of the water (physiological saline). This experiment was performed separately for three types of samples.

[0106] The result, such as Figure 6B As shown, it was clarified that Sample 1, formed by overlapping two layers of hydrophobic nonwoven fabric, had the lowest evaporation rate. Furthermore, comparing Sample 1 and Sample 2, it was confirmed that Sample 2, formed by overlapping hydrophilic nonwoven fabric with hydrophobic nonwoven fabric, had a higher evaporation rate than Sample 1. This indicates that by placing the hydrophilic nonwoven fabric on the side in contact with the atmosphere (non-skin side) as described above, moisture is transferred from the hydrophobic nonwoven fabric to the hydrophilic nonwoven fabric, thereby promoting evaporation of moisture from the hydrophilic nonwoven fabric to the atmosphere.

[0107] Furthermore, comparing samples 2 and 3, it was confirmed that sample 3, which uses meltblown nonwoven fabric with finer fiber diameter as the hydrophobic nonwoven fabric, has a higher evaporation rate than sample 2, which uses spunbond nonwoven fabric with coarser fiber diameter. This indicates that the higher the fiber density constituting the hydrophobic nonwoven fabric, as described above, the easier it is for capillary action to occur, and the easier it is for the hydrophobic nonwoven fabric to absorb moisture.

[0108] In the diaper 1 of the first embodiment, in the area of ​​the waist member 20 that overlaps with a pair of side joints 50 at least in the vertical direction, a hydrophilic nonwoven fabric is laminated adjacent to the hydrophobic nonwoven fabric on the non-skin side. That is, a hydrophobic region is provided on the surface closest to the skin, and a hydrophilic region is provided on the surface closest to the non-skin side. Therefore, as Figure 6A , Figure 6B The experimental results show that it becomes a structure that easily absorbs moisture from the skin side and causes it to evaporate to the non-skin side.

[0109] Furthermore, in diaper 1, a waist elastic member 35 is provided between the skin side piece 31 and the non-skin side piece 32 (see reference). Figure 3 Furthermore, when the wearer moves their body while wearing diaper 1, the waist elastic member 35 stretches and contracts in the left and right directions. Along with the stretching and contraction of the waist elastic member 35, the skin side panel 31 and the non-skin side panel 32 also stretch and contract in the left and right directions. This further enhances the absorption and evaporation of moisture.

[0110] For example, when the waist elastic member 35 contracts, the skin side sheet 31 contracts, increasing the fiber density and reducing the distance between fibers. In this situation, capillary action is more likely to occur, facilitating moisture absorption. On the other hand, when the waist elastic member 35 elongates, the skin side sheet 31 and the non-skin side sheet 32 ​​elongate, causing wrinkles and other imperfections on the sheet surface to stretch. This further tightens the skin side sheet 31 and the non-skin side sheet 32, facilitating moisture transfer via a hydrophilic gradient. Additionally, the elongation of the non-skin side sheet 32 ​​allows moisture to diffuse more easily along its planar direction, promoting transpiration into the atmosphere.

[0111] <Regarding the leg opening>

[0112] This explains how the waistband component 20 of the diaper 1 efficiently absorbs and evaporates moisture, thus minimizing discomfort in the wearer's waist. However, if the leg opening LH becomes damp while wearing the diaper 1, it may cause discomfort in the wearer's groin area.

[0113] The leg opening LH of the diaper 1 has a front leg opening region 71f and a rear leg opening region 71r (first region 71) formed by waist members 20 (30, 40), and a crotch leg opening region 72 (second region 72) formed by absorbent body 10 (see reference). Figure 2 In region 1, 71, when diaper 1 is worn, the hydrophobic skin-friendly side panels 31 and 41 are in contact with the wearer's skin, while the hydrophilic non-skin-friendly side panels 32 and 42 are not in contact with the wearer's skin (see reference). Figures 5A-5C Therefore, the wearer's skin is less likely to become damp, and discomfort is less likely to occur.

[0114] In contrast, in region 2 72, the non-skin side of the outer cover 13b constituting the absorbent body 10 abuts against the wearer's body. Figure 7A and Figure 7B This diagram illustrates the situation where the absorbent core 10 fits against the wearer's crotch area when the diaper 1 is worn. (See diagram for example.) Figure 7A As shown, when wearing diaper 1, the absorbent body 10 (diaper 1) is pulled up along the wearer's legs from the lower side (toe side) to the upper side (crotch side). Figure 7A In the middle, the part protruding to both sides in the left and right directions of the absorbent body 10 (the part with the leg circumference elastic member 17) is the part corresponding to the lower leg circumference region 72 (second region 72).

[0115] In the absorbent body 10 that is pulled down to the crotch, such as Figure 7BAs shown, the top of the leak-proof wall portion 15 rises towards the skin and abuts against the wearer's crotch (groin area) using the elasticity of the leak-proof wall member 16. Additionally, the second region 72 presses against the wearer's legs using the elasticity of the leg opening member 17. That is, at the crotch area of ​​the leg opening LH of the diaper 1, the outer sheet 13b, which is located on the non-skin side of the absorbent body 10, abuts against the wearer's skin.

[0116] Therefore, assuming that the outer cover 13b of the absorbent body 10 and the non-skin side panels 32 and 42 of the waist member 20 are both made of hydrophilic nonwoven fabric, the second region 72 is prone to retaining moisture and becoming damp. In this case, the wearer's leg circumference at the crotch area is prone to becoming damp, which may cause discomfort to the wearer.

[0117] In contrast, in the diaper 1 of the first embodiment, the outer sheet 13b is made of hydrophobic nonwoven fabric. That is, the hydrophobic nonwoven fabric is disposed at the non-skin side of the second region 72 in the leg opening LH. Therefore, at least the non-skin side of the portion of the leg opening LH that abuts against the wearer's crotch becomes a hydrophobic area, creating a structure that does not easily retain moisture. As a result, when wearing the diaper 1, the wearer's skin at the crotch area is less likely to become wet.

[0118] That is, for shorts-type diapers like diaper 1 with a so-called 3-piece construction (see...) Figure 2 In terms of wearing, when using hydrophobic nonwoven fabric as the outermost sheet component (outer sheet 13b) of the absorbent body 10 that comes into contact with the wearer's crotch area, it is less likely to cause discomfort to the wearer due to leg circumference.

[0119] More specifically, in the leg opening LH of the three-piece diaper 1, the non-skin side of the first region 71, formed by the waistband 20, is designed as a hydrophilic area, while the non-skin side of the second region 72, formed by the absorbent body 10, is designed as a hydrophobic area. This design allows moisture to easily evaporate in the first region 71 of the leg opening LH, while preventing moisture retention in the second region 72, which contacts the wearer's crotch area, thus reducing discomfort in the crotch area.

[0120] At this point, the preferred option is, such as Figure 2As shown, in the longitudinal direction (the length direction of the absorbent body 10), the length L72a (the length along the reference numeral 72) of the portion of the second region 72 forward of the central position CL is longer than the length L72b (the length along the reference numeral 72) of the portion of the second region 72 backward of the central position CL. When wearing the diaper 1, the wearer frequently moves their legs forward, such as while walking. Therefore, by pre-estimating the length L72a of the portion of the second region 72 forward of the central position CL, a larger hydrophobic area is created in front of the leg opening LH, making the legs less prone to wetting even when the wearer moves their legs forward. This reduces discomfort for the wearer.

[0121] Furthermore, preferably, in the first region 71 forming the leg opening LH, the length of the rear leg opening region 71r (the length along the portion marked 71r) located longitudinally behind the central position CL is longer than the length of the front leg opening region 71f (the length along the portion marked 71f) located longitudinally forward of the central position CL (L71r > L71f). The rear leg opening region 71r is more likely to come into contact with the wearer's buttocks over a larger area. Additionally, the rear leg opening region 71r is an area that is easily pressed against the body when the wearer is seated, such as while wearing a diaper 1. Therefore, by making the length L71r of the rear leg opening region 71r longer beforehand, the hydrophobic area at the rear (buttocks side) of the leg opening LH is enlarged, and the buttocks are less likely to become wet even when the wearer is seated. Thus, it is less likely to cause discomfort to the wearer.

[0122] Preferably, the waistband 20 (30, 40) of the diaper 1 is a two-layer structure consisting of a skin-side sheet 31 (41) made of hydrophobic nonwoven fabric and a non-skin-side sheet 32 ​​(42) made of hydrophilic nonwoven fabric, stacked along the thickness direction. By eliminating redundant sheet members in the waistband 20, the absorption and evaporation of moisture are less likely to be hindered, allowing for more efficient moisture release. The waistband 20 of this embodiment... Figure 3 The folded-back section 32f and other parts shown have a three-layer structure, but most areas of the waist member 20 have a two-layer structure consisting of two sheet members, skin-side panels 31 and 41 and non-skin-side panels 32 and 42, which can efficiently allow water to evaporate. Moreover, the hydrophilic area on the non-skin-side of the waist member 20 is made of a single piece of hydrophilic nonwoven fabric, thereby forming a hydrophilic area over a large area of ​​the waist member 20, which can further improve transpiration.

[0123] However, the above does not preclude the possibility that other sheet members may be provided in the waistband component 20 on the non-skin side of the hydrophilic nonwoven fabric (non-skin side panels 32, 42). For example, the skin side panel 31 (hydrophobic nonwoven fabric) may be folded back towards the non-skin side to partially cover the non-skin side of the non-skin side panel 32. In this case, moisture evaporation can be maintained in the uncovered non-skin side, thus reducing discomfort for the wearer.

[0124] In addition, preferably, such as Figure 2 As shown, the vertical length L40 of the rear waist portion 40 is longer than the vertical length L30 of the front waist portion 30. Since the rear waist portion 40 covers the wearer's buttocks when wearing the diaper 1, it is preferable to maximize its area to reliably cover the buttocks. On the other hand, it is preferable that the area of ​​the front waist portion 30 is not too large so that it does not interfere with leg movement when the wearer moves their leg forward, such as when walking. In addition, generally speaking, wearers tend to sweat more on their back than on their abdomen, and the amount of sweat on the back is more likely to be greater. Therefore, it is preferable to increase the area of ​​the rear waist portion 40 to facilitate sweat evaporation on the back.

[0125] Furthermore, the back waist section 40 of the diaper 1 has a buttock cover 40b located lower than the side joint 50 in the vertical direction, which allows for easy evaporation of sweat and other moisture from the wearer's buttocks. Moreover, a flexible elastic member 47 is provided along the edge of the buttock cover 40b (back leg area 71r). Utilizing the elasticity of this flexible elastic member 47, the buttock cover 40b easily and completely conforms to the wearer's buttocks when the diaper 1 is worn. Additionally, because the elasticity acts along the back leg area 71r, the back leg area 71r is less likely to roll up, reducing discomfort and discomfort for the wearer, and easily facilitating the moisture evaporation function achieved by the back waist section 40.

[0126] <Modified Examples of Installation Methods for Waist Elastic Members 35 and 45>

[0127] In the above embodiment, the waist elastic members 35 and 45 are installed on the waist member 20 using an adhesive method such as a hot melt adhesive. However, the installation method of the waist elastic members 35 and 45 is not limited to this. For example, the waist elastic members 35 and 45 can also be installed on the waist member 20 using a welding method such as ultrasonic welding. Furthermore, since ultrasonic welding is a known technology, a description of ultrasonic welding is omitted in this specification.

[0128] Figure 8A and Figure 8BThis figure illustrates a method for mounting the waist elastic member 35 to the front waist section 30 using welded portions 60. In this modified example, the waist elastic member 35 is mounted to the front waist section 30 using multiple welded portions 60, 60... distributed in the left-right and up-down directions. Each welded portion 60 is formed into a generally rectangular shape by ultrasonic welding, and they join the skin side panel 31 and non-skin side panel 32 of the front waist section 30 in the thickness direction. Furthermore, the waist elastic member 35 is clamped from both sides in the up-down direction using a pair of welded portions 60, 60 formed by two adjacent welded portions 60, 60 in the up-down direction, thereby mounting the waist elastic member 35 to the front waist section 30.

[0129] like Figure 8A As shown, the pair of weld portions 60, 60 constituting the weld portion pair 60s are arranged with a vertical spacing GH60 between them. Furthermore, the size of the spacing GH60 is set to be the same as or slightly larger than the diameter d35t of the waist elastic member 35 in its extended state (GH60 ≥ d35t). That is, the waist elastic member 35 in its extended state is arranged vertically between the weld portions 60s.

[0130] Next, as Figure 8B As shown, if the waist elastic member 35 relaxes from its extended state, it contracts in the left-right direction and expands in the up-down direction, and its diameter d35 in its natural state becomes larger than the vertical distance GH60 between the welded portions 60s (d35 > GH60). Therefore, the waist elastic member 35 is clamped by the welded portions 60s in the up-down direction. As a result, the waist elastic member 35 is installed on the front waist portion 30.

[0131] In addition, Figure 1 In the shorts-type diaper 1, the waist elastic member 35 (45) is in a relaxed, natural state from the extended state described above. Furthermore, in the shorts-type diaper 1, the waist elastic member 35 (45) is joined to the front waist portion 30 (back waist portion 40) via side joints 50, 50 on both sides in the left and right directions. Therefore, when wearing the diaper 1, even if the front waist portion 30 (back waist portion 40) extends in the left and right directions, the waist elastic member 35 (45) will not detach from the waist member 20.

[0132] ===Second Implementation Method===

[0133] In the second embodiment, a shorts-type diaper 2 (hereinafter also referred to as "diaper 2") with a structure that differs from that in the first embodiment will be described. Figure 9 This is a top view of diaper 2 in its unfolded and extended state. Figure 10 yes Figure 9A rough cross-sectional view at line BB. Furthermore, Figure 9 and Figure 10 The directions (e.g., longitudinal, transverse, etc.) are the same as those defined in the first embodiment.

[0134] The diaper 2 of the second embodiment has an absorbent body 10 and a waist member 20 attached to the non-skin side of the absorbent body 10. However, in the diaper 2, the front waist portion 30 and the rear waist portion 40 are positioned such that... Figure 9 and Figure 10 It is constructed as a single unit in a continuous manner along the longitudinal (front and back) direction. That is, the diaper 2 is a so-called two-piece disposable diaper consisting of an absorbent body 10 as the inner body and a waist member 20 as the outer body.

[0135] In Figure 9 When the diaper 2 in its unfolded state is formed into a shorts shape, the absorbent body 10 and the waistband 20 are folded in half at the longitudinal center position CL. The side portions 30sw and 40sw of the front waistband 30 and the rear waistband 40, which are opposite each other in this folded state, are joined and connected to each other in the left-right direction, thereby forming a pair of side joint portions 50, 50. Thus, with... Figure 1 Similarly, the diaper 2 becomes a shorts-shaped diaper with a waist opening BH and a pair of leg openings LH, LH.

[0136] In diaper 2, since the basic structure and function of the absorbent body 10 are substantially the same as those of diaper 1 in the first embodiment, description is omitted. However, in diaper 2, the crotch area, including the central position CL in the longitudinal direction (length direction of the absorbent body 10), has a portion where the width of the absorbent body 10 in the left-right direction is wider than the width of the waist member 20 in the left-right direction. In other words, in the left-right direction, the minimum value of the length (width) of the waist member 20 is smaller than the minimum value of the length (width) of the absorbent body 10. Therefore, when wearing diaper 2, the two side edges of the absorbent body 10 in the left-right direction in the area near the wearer's crotch area come into contact with the wearer's legs.

[0137] That is, in diaper 2, in Figure 9In the region along the leg opening LH, indicated by the diagonal lines, the area formed by the side edge of the absorbent body 10 becomes the lower leg opening region 72 (second region 72). On the other hand, the area formed by the lower edge of the front waist portion 30 becomes the front leg opening region 71f (first region 71), and the area formed by the lower edge of the rear waist portion 40 becomes the rear leg opening region 71r (first region 71). Furthermore, an elastic member that extends longitudinally may be provided on the side edge of the absorbent body 10, forming a leg pleat that is wider laterally. In this case, the two ends of the leg pleat become the side edges of the absorbent body 10.

[0138] Furthermore, in diaper 2, the portion of the waist member 20 that is forward of the central position CL in the longitudinal direction (the length direction of the absorbent body 10) becomes the front waist part 30, and the portion that is backward of the central position CL becomes the rear waist part 40. The waist member 20 has a skin side sheet 21, a non-skin side sheet 22 that is stacked adjacent to the skin side sheet 21 on the non-skin side of the skin side sheet 21, and waist elastic members 35 and 45 (see reference) disposed in the thickness direction between the skin side sheet 21 and the non-skin side sheet 22. Figure 10 ).

[0139] The skin-friendly side panel 21 is made of the same hydrophobic nonwoven fabric as the skin-friendly side panels 31 and 41 of diaper 1. The non-skin-friendly side panel 22 is made of the same hydrophilic nonwoven fabric as the non-skin-friendly side panels 32 and 42 of diaper 1. That is, in diaper 2, the non-skin-friendly side panel 22 is a nonwoven fabric with higher hydrophilicity than the skin-friendly side panel 21. Moreover, similar to diaper 1, the waist elastic members 35 and 45 are made of elastic bands or the like, and they are installed between the skin-friendly side panel 21 and the non-skin-friendly side panel 22 in a state of elongation in the left and right directions.

[0140] The diaper 2 of the second embodiment is similar to diaper 1 in that, in the area of ​​the waist member 20 that overlaps with a pair of side joints 50 at least in the vertical direction, a hydrophobic region formed of hydrophobic nonwoven fabric (skin side sheet 21) is provided on the surface closest to the skin, and a hydrophilic region formed of hydrophilic nonwoven fabric (non-skin side sheet 22) is provided on the surface closest to the non-skin side. Thus, similar to the structure described in diaper 1, it has a structure that easily absorbs moisture from the wearer's skin side and allows the moisture to evaporate into the atmosphere on the non-skin side.

[0141] Furthermore, in diaper 2, the outer sheet 13b of the absorbent body 10 is made of hydrophobic nonwoven fabric. That is, in the leg opening LH, the hydrophobic nonwoven fabric is positioned at the non-skin side of the second region 72. Therefore, at least the non-skin side of the portion of the leg opening LH that abuts against the wearer's crotch becomes a hydrophobic area, creating a structure that does not easily retain moisture. As a result, when wearing diaper 2, the crotch area of ​​the wearer's leg opening is less likely to become wet.

[0142] That is, in a shorts-type diaper with a so-called two-piece structure, such as diaper 2, a hydrophobic nonwoven fabric is used as the outermost sheet component (outer sheet 13b) of the absorbent body 10 that comes into contact with the wearer's crotch, thereby making it less likely for the wearer to experience discomfort around the legs.

[0143] Furthermore, in the leg openings LH of the two-piece diaper 2, the non-skin side of the first region 71, formed by the waistband 20, is designed as a hydrophilic area, while the non-skin side of the second region 72, formed by the absorbent body 10, is designed as a hydrophobic area. This design allows moisture to easily evaporate in the first region 71 of the leg openings LH, while reducing moisture retention in the second region 72, which contacts the wearer's crotch area, thus preventing the wearer's crotch from becoming damp. Consequently, discomfort is less likely to occur to the wearer over a larger area of ​​the crotch area.

[0144] In addition, preferably, such as Figure 9 As shown, in the longitudinal direction (the length direction of the absorbent body 10), the length L72a (the length along the reference numeral 72) of the portion of the second region 72 forward of the central position CL is longer than the length L72b (the length along the reference numeral 72) of the portion of the second region 72 backward of the central position CL. When wearing the diaper 2, the wearer frequently moves their legs forward, such as while walking. Therefore, by pre-estimating the length L72a of the portion of the second region 72 forward of the central position CL, a larger hydrophobic area is created in front of the leg opening LH, making the legs less prone to wetting even when the wearer moves their legs forward. This reduces discomfort for the wearer.

[0145] Furthermore, preferably, in the first region 71 forming the leg opening LH, the length of the rear leg opening region 71r (the length along the portion marked 71r) located longitudinally behind the central position CL is longer than the length of the front leg opening region 71f (the length along the portion marked 71f) located longitudinally forward of the central position CL (L71r > L71f). The rear leg opening region 71r easily comes into contact with a larger area of ​​the wearer's buttocks. In addition, this rear leg opening region 71r is an area that is easily pressed against the body by body pressure when the wearer sits down while wearing a diaper 1. Therefore, by making the length L71r of the rear leg opening region 71r longer in advance, a larger hydrophobic area is created on the rear side (buttock side) of the leg opening LH, so that the buttocks are less likely to become wet even when the wearer is in a seated position. Therefore, it is less likely to cause discomfort to the wearer.

[0146] Additionally, in the left-right direction of the diaper 2, the distance between the outermost end and the innermost end of the waist member 20 is set as W71, and the distance between the outermost end of the absorbent body 10 and the innermost end of the waist member 20 is set as W72 (refer to...). Figure 9 W72 represents the length (width) of the portion of the absorbent body 10 extending outward in the left-right direction from the narrowest part of the waist member 20. Furthermore, it is preferable that the width W72 is smaller than half the width W71 (W71 × 1 / 2 > W72).

[0147] Assuming that the side edge of the absorbent body 10 extends outward by a length greater than half the length of W71, the opening area of ​​the leg opening LH becomes smaller. This could make it difficult for the wearer to move their legs when wearing the diaper 2, or cause discomfort due to the leg opening area 72 pressing against the wearer's groin. In contrast, if the relationship is as described above (W71 × 1 / 2 > W72), then the excessive outward extension of the side edge of the absorbent body 10 (leg opening area 72) in the lateral direction is prevented. Therefore, when wearing the diaper 2, the wearer can move their legs more easily, and discomfort around the leg opening is less likely to occur.

[0148] Furthermore, preferably, the waistband 20 (30, 40) of the diaper 2 is a two-layer structure consisting of a skin-side sheet 21 made of hydrophobic nonwoven fabric and a non-skin-side sheet 22 made of hydrophilic nonwoven fabric, stacked along the thickness direction. By eliminating redundant sheet components in the waistband 20, it is less likely to hinder moisture absorption and evaporation, allowing for more efficient moisture release. Moreover, the hydrophilic area on the non-skin-side of the waistband 20 is composed of a single piece of hydrophilic nonwoven fabric, thereby creating a larger hydrophilic area over the waistband 20 and further improving evaporation.

[0149] Additionally, the back waist section 40 of the diaper 2 has a buttock cover 40b located below the side joint 50 in the vertical direction (see reference). Figure 9 The buttock cover 40b allows for easy evaporation of sweat and other moisture from the wearer's buttocks. Furthermore, a flexible elastic member 47 is provided along the edge of the buttock cover 40b (rear leg area 71r). Utilizing the elasticity of this flexible elastic member 47, the buttock cover 40b easily and completely conforms to the wearer's buttocks when the diaper 2 is worn. Moreover, the elasticity operates along the rear leg area 71r, preventing the rear leg area 71r from rolling up, thus minimizing discomfort and discomfort for the wearer, and facilitating the moisture evaporation function achieved by the rear waist area 40.

[0150] ===Third Implementation Method===

[0151] In the third embodiment, a shorts-type diaper 3 (hereinafter also referred to as "diaper 3") with a structure that differs from that in the first and second embodiments will be described. Figure 11 This is a top view of diaper 3 in its unfolded and extended state. Figure 12 yes Figure 11 A rough cross-sectional view at the CC line. Furthermore, Figure 11 and Figure 12 The directions (e.g., longitudinal, transverse, etc.) are the same as those defined in the first embodiment.

[0152] The diaper 3 of the third embodiment has an absorbent body 10 with absorbent properties and a waist member 20 attached to the non-skin side of the absorbent body 10. However, as Figure 12 As shown, in diaper 3, the skin side piece 21 (front skin side piece) constituting the front waist portion 30 and the skin side piece 21 (rear skin side piece) constituting the rear waist portion 40 are constructed as a continuous, integral sheet member in the longitudinal direction. On the other hand, the non-skin side piece 32 (front non-skin side piece) constituting the front waist portion 30 and the non-skin side piece 42 (rear non-skin side piece) constituting the rear waist portion 40 are constructed as discontinuous, independent sheet members in the longitudinal direction. Hereinafter, this type of diaper will also be referred to as a simple 3-piece disposable diaper.

[0153] In Figure 12 When the diaper 3 in its unfolded state is formed into a shorts shape, the absorbent body 10 and the waistband member 20 are folded in half at the longitudinal center position CL. The side portions 30sw and 40sw of the front waistband 30 and the rear waistband 40, which are opposite each other in this folded state, are joined and connected to each other in the left-right direction, thereby forming a pair of side joint portions 50, 50. Thus, with... Figure 1 Similarly, the diaper 3 becomes a shorts-shaped diaper with a waist opening BH and a pair of leg openings LH, LH.

[0154] In diaper 3, since the basic structure and function of the absorbent body 10 are substantially the same as those of diaper 1 in the first embodiment, the description is omitted.

[0155] Furthermore, in the diaper 3, the portion of the waist member 20 that is forward of the central position CL in the longitudinal direction (the length direction of the absorbent body 10) becomes the front waist part 30, and the portion that is backward of the central position CL becomes the rear waist part 40. The front waist part 30 has: a skin side sheet 21, the skin side of which extends from one end (ventral side) to the other end (dorsal side) in the longitudinal direction in the thickness direction; a non-skin side sheet 32, which is stacked adjacent to the non-skin side sheet 21 in the longitudinal direction on the front (ventral side) side of the skin side sheet 21; and a waist elastic member 35, which is disposed between the skin side sheet 21 and the non-skin side sheet 32 ​​in the thickness direction. The rear waist section 40 has a skin side plate 21 shared with the front waist section 30, a non-skin side plate 42 that is stacked adjacent to the skin side plate 21 on the non-skin side of the skin side plate 21 in the longitudinal direction (back side), and a waist elastic member 45 disposed between the skin side plate 21 and the non-skin side plate 42 in the thickness direction.

[0156] Skin side panel 21 is made of the same hydrophobic nonwoven fabric as skin side panels 31 and 41 of diaper 1. Non-skin side panels 32 and 42 are made of the same hydrophilic nonwoven fabric as non-skin side panels 32 and 42 of diaper 1. That is, in diaper 3, non-skin side panels 32 and 42 are made of nonwoven fabric with higher hydrophilicity than skin side panel 21. Moreover, similar to diaper 1, waist elastic members 35 and 45 are made of elastic bands or the like, and they are installed between skin side panel 21 and non-skin side panels 32 and 42 in a state of elongation in the left and right directions.

[0157] In the diaper 3 of the third embodiment, the leg opening LH is formed by the waist member 20. Additionally, in Figure 11In the region along the leg opening LH indicated by the diagonal line, the area formed only by the skin side piece 21 of the waist member 20 is designated as the lower leg area 72 (second area 72), and the area formed by the overlapping portion of the skin side piece 21 and the non-skin side pieces 32, 42 is designated as the front leg area 71f and the rear leg area 71r (first area 71).

[0158] like Figure 11 and Figure 12 As shown, in the diaper 3, in the area of ​​the waist member 20 that overlaps with a pair of side joints 50 at least in the vertical direction, a hydrophobic region formed of hydrophobic nonwoven fabric (skin side piece 21) is provided on the surface closest to the skin, and a hydrophilic region formed of hydrophilic nonwoven fabric (non-skin side pieces 32, 42) is provided on the surface closest to the non-skin side. Therefore, it has a structure that easily absorbs moisture from the wearer's skin side and allows the moisture to evaporate into the atmosphere on the non-skin side.

[0159] Furthermore, in diaper 3, the crotch leg area 72 (second area 72) is composed of a piece of hydrophobic nonwoven fabric (skin side panel 21). That is, the hydrophobic nonwoven fabric is positioned on the non-skin side of the second area 72 in the leg opening LH. Therefore, at least the non-skin side of the portion of the leg opening LH that abuts against the wearer's crotch becomes a hydrophobic area, creating a structure that does not easily retain moisture. As a result, when wearing diaper 3, the crotch area of ​​the wearer's leg area is less likely to become wet.

[0160] That is, in shorts-type diapers such as Diaper 3, which have a so-called simple 3-piece structure, hydrophobic nonwoven fabric is used in the part that comes into contact with the wearer's crotch, thereby making it less likely for the wearer to experience discomfort around the legs.

[0161] Furthermore, in the leg opening LH of the simple 3-piece diaper 3, the non-skin side of the first region 71, which is equipped with non-skin side panels 32 and 42, becomes a hydrophilic area, while the non-skin side of the second region 72, which is composed of skin side panels 21, becomes a hydrophobic area. This means that in the leg opening LH, moisture easily evaporates in the first region 71, while moisture is not easily retained in the second region 72, which comes into contact with the wearer's crotch, preventing the wearer's crotch from becoming damp. Therefore, discomfort is less likely to occur to the wearer over a larger area of ​​the crotch.

[0162] Furthermore, in the leg opening LH of the diaper 3, the sheet member disposed on the non-skin side of the absorbent body 10's liquid-impermeable sheet 13a is only the skin-side sheet 21. That is, only one piece of hydrophobic nonwoven fabric is disposed in the second region 72 of the diaper 3 on the non-skin side of the absorbent body 10. By minimizing the number of sheet members disposed in the second region 72, the stiffness of this region is reduced, thereby making the skin-peripheral part of the crotch area of ​​the leg opening LH softer when wearing the diaper 3, allowing the wearer to experience a comfortable wearing experience.

[0163] In addition, preferably, such as Figure 11 As shown, in the longitudinal direction (the length direction of the absorbent body 10), the length L72a (the length along the reference numeral 72) of the portion of the second region 72 forward of the central position CL is longer than the length L72b (the length along the reference numeral 72) of the portion of the second region 72 backward of the central position CL. When wearing the diaper 2, the wearer frequently moves their legs forward, such as while walking. Therefore, by pre-estimating the length L72a of the portion of the second region 72 forward of the central position CL, a larger hydrophobic area is created in front of the leg opening LH, making the legs less prone to getting wet even when the wearer moves their legs forward. This reduces discomfort for the wearer.

[0164] Furthermore, preferably, in the first region 71 forming the leg opening LH, the length L71r of the rear leg opening region 71r (the length along the portion marked 71r) located longitudinally behind the central position CL is longer than the length L71f of the front leg opening region 71f (the length along the portion marked 71f) located longitudinally in front of the central position CL (L71r > L71f). The rear leg opening region 71r easily comes into contact with a larger area of ​​the wearer's buttocks. In addition, this rear leg opening region 71r is an area that is easily pressed against the body when the wearer sits down while wearing a diaper 1. Therefore, by making the length L71r of the rear leg opening region 71r longer in advance, a larger hydrophobic area is created on the rear side (buttock side) of the leg opening LH, so that the buttocks are less likely to become wet even when the wearer is in a seated position. Therefore, it is less likely to cause discomfort to the wearer.

[0165] Furthermore, preferably, the waistband 20 (30, 40) of the diaper 3 is a two-layer structure consisting of a skin-side sheet 21 made of hydrophobic nonwoven fabric and a non-skin-side sheet 32 ​​(42) made of hydrophilic nonwoven fabric, stacked along the thickness direction. By eliminating redundant sheet components in the waistband 20, it is less likely to hinder moisture absorption and evaporation, allowing for more efficient moisture release. Moreover, the hydrophilic area on the non-skin-side of the waistband 20 is composed of a single piece of hydrophilic nonwoven fabric, thereby creating a larger hydrophilic area within the waistband 20 and further improving evaporation.

[0166] Additionally, the back waist section 40 of the diaper 3 has a buttock cover 40b located below the side joint 50 in the vertical direction (see reference). Figure 11 The buttock cover 40b allows for easy evaporation of sweat and other moisture from the wearer's buttocks. Furthermore, a flexible elastic member 47 is provided along the edge of the buttock cover 40b (rear leg area 71r). Utilizing the elasticity of this flexible elastic member 47, the buttock cover 40b easily and completely conforms to the wearer's buttocks when the diaper 3 is worn. Moreover, the elasticity operates along the rear leg area 71r, preventing the rear leg area 71r from rolling up, thus minimizing discomfort and discomfort for the wearer, and facilitating the effective evaporation of moisture achieved by the rear waist area 40.

[0167] (Modified Example)

[0168] In diaper 3, the shape of absorbent body 10 can be deformed in the same way as in diaper 2 of the second embodiment, so that the length (width) of absorbent body 10 in the left-right direction is greater than the minimum length (width) of waist member 20 in the left-right direction. Figure 13 This is a top view of a modified example of diaper 3 in its unfolded and elongated state. Figure 14 yes Figure 13 A rough cross-sectional view at line D-D.

[0169] In a variation of diaper 3, in Figure 13 The area along the leg opening LH, indicated by the diagonal lines, is the lower leg opening region 72 (second region 72) formed by the side edge of the absorbent body 10. On the other hand, the area formed by the lower edge of the front waist portion 30 is the front leg opening region 71f (first region 71), and the area formed by the lower edge of the rear waist portion 40 is the rear leg opening region 71r (first region 71). Other structures are similar to those in… Figure 11 The structure of diaper 3 described in the text is roughly the same.

[0170] In the modified diaper 3, the outer sheet 13b of the absorbent body 10 is made of hydrophobic nonwoven fabric. Specifically, the hydrophobic nonwoven fabric is positioned on the non-skin side of the second region 72 in the leg opening LH. Therefore, at least the non-skin side of the portion of the leg opening LH that abuts against the wearer's crotch becomes a hydrophobic area, creating a structure that does not easily retain moisture. Consequently, the wearer's skin is less likely to become damp in the crotch area.

[0171] That is, in diaper 3 has Figure 13 In such a structure (the case of the modified example), hydrophobic nonwoven fabric is used as the outermost sheet component (outer sheet 13b) of the absorbent body 10 that contacts the wearer's crotch area, so that the wearer is less likely to experience discomfort in the leg circumference.

[0172] Furthermore, similar to the description of diaper 2 above, it is preferable that, in the left-right direction of the modified diaper 3, the distance W72 between the outermost end of the absorbent body 10 and the innermost end of the waist member 20 is less than half the distance W71 between the outermost end of the waist member 20 and the innermost end of the waist member 20. This prevents the side edge of the absorbent body 10 (crotch leg area 72) from excessively extending outward in the left-right direction, making it easier for the wearer to move their legs when wearing the diaper 3, and also reducing discomfort around the legs.

[0173] ===Other Implementation Methods===

[0174] The embodiments of the present invention have been described above, but these embodiments are intended to facilitate understanding of the present invention and are not intended to limit the interpretation of the present invention. Furthermore, it is self-evident that the present invention can be modified and improved without departing from its spirit, and that equivalents are included in the present invention.

Claims

1. A pant-type absorbent article having an up-down direction, a left-right direction, and a front-rear direction intersecting each other, the pant-type absorbent article having a waist member and a liquid-absorbing absorbent main body, the waist member being formed by joining a front waist portion and a rear waist portion in a ring shape with a pair of side joints provided at both ends in the left-right direction, the pant-type absorbent article having a pair of leg opening for passing both legs of a wearer, the pant-type absorbent article being characterized in that, a hydrophilic region is provided at least partially at a position on a non-skin side in a region of the waist member overlapping with the pair of side joints in the up-down direction, a hydrophobic region having a lower hydrophilicity than the hydrophilic region is provided at least at a position on a non-skin side of a lowermost portion in a region along the leg opening, the front waist portion is joined on one side in a longitudinal direction in a spread state of the absorbent main body, and the rear waist portion is joined on the other side in the longitudinal direction, a hydrophilic nonwoven fabric is provided at a position on a non-skin side of at least one of the front waist portion and the rear waist portion, a hydrophobic nonwoven fabric having a lower hydrophilicity than the hydrophilic nonwoven fabric is provided at a position on a non-skin side of the absorbent main body, the leg opening has a first region constituted by the waist member and a second region constituted by the absorbent main body at a lower end of the side joint and a position lower than the lower end in the left-right direction, a portion on a non-skin side of the first region is a hydrophilic region, and a portion on a non-skin side of the second region is a hydrophobic region.

2. A pant-type absorbent article having an up-down direction, a left-right direction, and a front-rear direction intersecting each other, the pant-type absorbent article having a waist member and a liquid-absorbing absorbent main body, the waist member being formed by joining a front waist portion and a rear waist portion in a ring shape with a pair of side joints provided at both ends in the left-right direction, the pant-type absorbent article having a pair of leg opening for passing both legs of a wearer, the pant-type absorbent article being characterized in that, a hydrophilic region is provided at least partially at a position on a non-skin side in a region of the waist member overlapping with the pair of side joints in the up-down direction, a hydrophobic region having a lower hydrophilicity than the hydrophilic region is provided at least at a position on a non-skin side of a lowermost portion in a region along the leg opening, the waist member is integrally formed in a manner that the front waist portion and the rear waist portion are continuous in a longitudinal direction in a spread state, the waist member is joined on a non-skin side of the absorbent main body, a hydrophilic nonwoven fabric is provided at a position on a non-skin side of the waist member, a hydrophobic nonwoven fabric having a lower hydrophilicity than the hydrophilic nonwoven fabric is provided at a position on a non-skin side of the absorbent main body, in the left-right direction, a minimum value of a width of the waist member is smaller than a minimum value of a width of the absorbent main body, in the left-right direction, a minimum value of a width of the waist member is smaller than a minimum value of a width of the absorbent main body, The leg opening has a first region constituted by the waist member and a second region constituted by the absorbent main body at a lower end of the side joint portion and a position lower than the lower end, A portion of the first region closest to the non-skin side is a hydrophilic region, and a portion of the second region closest to the non-skin side is a hydrophobic region.

3. The pant-type absorbent article according to claim 2, wherein In the left-right direction, a distance between an outermost end of the absorbent main body and an innermost end of the waist member is smaller than 1 / 2 of a distance between an outermost end of the waist member and an innermost end of the waist member.

4. The pant-type absorbent article according to claim 1 or 2, wherein A length of a portion along the second region on an anterior side of a central position in the longitudinal direction of the pant-type absorbent article in the unfolded state is greater than a length of a portion along the second region on a posterior side of the central position.

5. The pant-type absorbent article according to claim 1 or 2, wherein A length of a portion along the first region on a posterior side of a central position in the longitudinal direction of the pant-type absorbent article in the unfolded state is greater than a length of a portion along the first region on an anterior side of the central position.

6. A pant-type absorbent article having an up-down direction, a left-right direction, and a front-rear direction intersecting with each other, The pant-type absorbent article has a waist member and an absorbent main body, the waist member being formed by annularly joining a front waist portion and a rear waist portion by a pair of side joint portions provided at both ends in the left-right direction, The pant-type absorbent article has a pair of leg opening through which both legs of a wearer pass, and is characterized in that A hydrophilic region is provided at a position closest to the non-skin side of at least a portion of a region of the waist member overlapping with the pair of side joint portions in the up-down direction, A hydrophobic region having a lower hydrophilicity than the hydrophilic region is provided at a position closest to the non-skin side of at least a portion of a region along the leg opening at a lowermost end, The front waist portion has a front skin side sheet and a front non-skin side sheet, The rear waist portion has a rear skin side sheet and a rear non-skin side sheet, The front skin side sheet and the rear skin side sheet are a single sheet member continuous in the longitudinal direction in the unfolded state, The front non-skin side sheet and the rear non-skin side sheet are separate sheet members discontinuous in the longitudinal direction in the unfolded state, The waist member is joined to the non-skin side of the absorbent main body, The separate sheet members constituting the front non-skin side sheet and the rear non-skin side sheet are hydrophilic nonwoven fabrics, The single sheet member constituting the front skin side sheet and the rear skin side sheet is a hydrophobic nonwoven fabric having a lower hydrophilicity than the hydrophilic nonwoven fabrics, In the left-right direction, a minimum value of the width of the waist member is greater than a minimum value of the width of the absorbent main body, The leg opening has a first region and a second region at a position lower than a lower end of the side joint portion, the first region being composed of the waist member and configured to include the front non-skin side panel and the back non-skin side panel, the second region not including the front non-skin side panel and the back non-skin side panel and being composed of the front skin side panel and the back skin side panel, A portion of the first region closest to the non-skin side is a hydrophilic region, and a portion of the second region closest to the non-skin side is a hydrophobic region.

7. The pant-type absorbent article according to claim 6, wherein The sheet member disposed at a position closer to the non-skin side than the absorbent body in the second region is only one piece of the hydrophobic nonwoven fabric.

8. A pant-type absorbent article having a vertical direction, a lateral direction, and a front-rear direction intersecting with each other, The pant-type absorbent article has a waist member and an absorbent body, the waist member being formed by annularly joining a front waist portion and a back waist portion with a pair of side joint portions provided at both ends in the lateral direction, The pant-type absorbent article has a pair of leg openings through which both legs of a wearer pass, and is characterized in that A portion of at least a part of the waist member in a region overlapping the pair of side joint portions in the vertical direction is provided with a hydrophilic region at a position closest to the non-skin side, A portion of at least a part of a region along the leg opening is provided with a hydrophobic region having a lower hydrophilicity than the hydrophilic region at a position closest to the non-skin side, The front waist portion has a front skin side panel and a front non-skin side panel, The back waist portion has a back skin side panel and a back non-skin side panel, The front skin side panel and the back skin side panel are one integral sheet member continuous in the longitudinal direction in the unfolded state, The front non-skin side panel and the back non-skin side panel are two independent sheet members discontinuous in the longitudinal direction in the unfolded state, The waist member is joined to the non-skin side of the absorbent body, The two independent sheet members constituting the front non-skin side panel and the back non-skin side panel are hydrophilic nonwoven fabrics, The one integral sheet member constituting the front skin side panel and the back skin side panel is a hydrophobic nonwoven fabric having a lower hydrophilicity than the hydrophilic nonwoven fabric, In the lateral direction, a minimum value of the width of the waist member is smaller than a minimum value of the width of the absorbent body, The leg opening has a first region composed of the waist member and a second region composed of the absorbent body at a lower end of the side joint portion and a position lower than the lower end, A portion of the first region closest to the non-skin side is a hydrophilic region, and a portion of the second region closest to the non-skin side is a hydrophobic region.

9. The pant-type absorbent article according to claim 6 or 8, wherein A length of a portion along the second region on a front side of a central position in the longitudinal direction of the pant-type absorbent article in the unfolded state is greater than a length of a portion on a rear side of the central position.

10. The pant-type absorbent article according to claim 6 or 8, characterized in that the length of the portion of the first region along the longitudinal direction of the pant-type absorbent article in the unfolded state on the rear side of the central position is greater than the length of the portion of the first region on the front side of the central position.

11. The pant-type absorbent article according to any one of claims 1, 2, 6, and 8, characterized in that the layer on the most non-skin side of the front waist portion and the rear waist portion is respectively composed of a piece of hydrophilic nonwoven fabric.

12. The pant-type absorbent article according to any one of claims 1, 2, 6, and 8, characterized in that the rear waist portion has a hip cover at a position on the lower side than the lower end of the side joint portion, the width of the hip cover in the left-right direction narrows as it goes from the upper side to the lower side in the up-down direction, an elastic member is provided which stretches along the end edge portion of the hip cover.

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