Water-absorbing sanitary underwear

Abstract

To provide water-absorbing sanitary underwear capable of improving diffusibility of body fluid and inhibiting liquid return.SOLUTION: Water-absorbing sanitary underwear (1) is reusable underwear having: a surface layer (10); an absorption layer (20) disposed on a non-skin surface side (T2) of the surface layer; and a waterproof layer (30) disposed on the non-skin surface side of the absorption layer. The surface layer and the absorption layer mainly include non-water-absorbing fibers. The water repellency of the skin surface of the surface layer is higher than the water repellency of the non-skin surface of the surface layer. The absorption layer has an intake region (25) in which the density increases from a skin surface side toward the non-skin surface side. The intake region has a diffusion portion (27) including fibers oriented in a planar direction.SELECTED DRAWING: Figure 6

Description

[Technical field] 【0001】 The present invention relates to reusable moisture-absorbing sanitary shorts. [Background technology] 【0002】 Patent Document 1 discloses reusable water-absorbent sanitary shorts. The water-absorbent sanitary shorts of Patent Document 1 have a patch placed in the crotch area. The patch is made of a stretchable fabric containing cotton yarn and polyurethane yarn, and contains 20% or more of cotton yarn. [Prior art documents] [Patent documents] 【0003】 [Patent Document 1] Patent Publication No. 2022-91191 Summary of the Invention [Problem to be solved by the invention] 【0004】 The patch of the absorbent sanitary shorts in Patent Document 1 contains cotton yarn, which makes it easy to ensure moisture absorption, but makes it difficult to ensure the diffusion of body fluids, and fluid backflow can occur due to localized retention of body fluids. 【0005】 The present invention has been made in consideration of such problems, and has an object to provide absorbent sanitary shorts that can improve the diffusibility of bodily fluids and suppress liquid backflow. [Means for solving the problem] 【0006】 The water-absorbent sanitary shorts according to one embodiment are reusable shorts having a surface layer, an absorbent layer disposed on the non-skin-facing side of the surface layer, and a waterproof layer disposed on the non-skin-facing side of the absorbent layer. The surface layer and the absorbent layer mainly contain non-water-absorbent fibers. The water repellency of the skin side of the surface layer is higher than the water repellency of the non-skin side of the surface layer. The absorbent layer has a retraction region whose density increases from the skin side to the non-skin side. The retraction region has a diffusion portion containing fibers oriented in a planar direction. [Brief description of the drawings] 【0007】 [Figure 1] FIG. 1 is a plan view of water-absorbent sanitary shorts according to an embodiment, as viewed from the front. [Diagram 2] FIG. 2 is a plan view of the water-absorbent sanitary shorts according to the embodiment, seen from the rear side. [Diagram 3] FIG. 3 is a plan view of the crotch region of the water-absorbent sanitary shorts according to the embodiment, seen from the skin-facing side. [Figure 4] FIG. 4 is a schematic cross-sectional view showing the crotch region taken along the line AA shown in FIG. [Diagram 5] FIG. 5 is a schematic cross-sectional view showing a cross section taken along line DD shown in FIG. [Figure 6] FIG. 6 is a schematic enlarged view of a part of the water-absorbent sanitary shorts. [Figure 7] FIG. 7 is a diagram showing a schematic diagram of a deformation state when worn, based on the cross section shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 【0008】 (1) Overview of the embodiment At least the following points will become apparent from the description of this specification and the accompanying drawings. The invention according to the first aspect is a reusable water-absorbent sanitary shorts. The water-absorbent sanitary shorts have a surface layer, an absorbent layer arranged on the non-skin side of the surface layer, and a waterproof layer arranged on the non-skin side of the absorbent layer. The surface layer and the absorbent layer mainly contain non-water-absorbent fibers. The water repellency of the skin side of the surface layer is higher than the water repellency of the non-skin side of the surface layer. The absorbent layer has a retraction region whose density increases from the skin side to the non-skin side. The retraction region has a diffusion portion containing fibers oriented in a planar direction. According to this aspect, the surface layer and the absorbent layer mainly contain non-water-absorbent fibers, and the diffusion of body fluids can be improved compared to a configuration mainly containing water-absorbent fibers. In addition, since the water repellency of the non-skin side of the surface layer is relatively low, the body fluid drawn into the surface layer can be easily guided to the absorbent layer. On the other hand, since the water repellency of the skin side of the surface layer is relatively high, the body fluid drawn into the surface layer can be prevented from returning from the skin side of the surface layer. The body fluid guided into the absorbent layer is promoted to move from low density to high density in the drawing-in area, and while being guided to the non-skin facing side, in the diffusion area, it is diffused in the planar direction by the planarly oriented fibers and is retained over a wide area. This makes it possible to suppress the return of the body fluid due to localized retention of the body fluid. 【0009】 According to a preferred embodiment, the invention according to embodiment 2 may have the following features in the invention according to embodiment 1. The nominal moisture regain of the non-absorbent fiber of the surface layer is less than 1%. According to this embodiment, fibers with nominal moisture regain of less than 1% have a low moisture content during normal use, such as when worn. This can reduce stickiness of the surface layer that comes into contact with the skin and improve the wearing comfort. 【0010】 According to a preferred embodiment, the invention according to embodiment 3 may have the following features in the invention according to embodiment 1 or embodiment 2. The standard moisture regain of the non-absorbent fiber that is the main component of the absorbent layer is less than 1%. According to this embodiment, the fiber of the absorbent layer is less likely to absorb moisture, which can further promote the diffusion of bodily fluids. 【0011】 According to a preferred embodiment, the invention according to embodiment 4 may have the following features in the invention according to any one of embodiments 1 to 3. The skin side of the surface layer is provided with a water-repellent region having a higher water repellency than the non-skin side of the surface layer. In a plan view of the shorts, the area of ​​the water-repellent region on the skin side of the surface layer is 50% or more and 90% or less of the entire skin side of the surface layer. According to this embodiment, since the area ratio of the water-repellent region is 50% or more, it is possible to suppress liquid return in about half of the area. In addition, since the area ratio of the water-repellent region is 90% or less, it is possible to draw body fluids to the non-skin side in at least 10% of the area, ensuring liquid drawing ability. 【0012】 According to a preferred embodiment, the invention according to embodiment 5 may have the following features in the invention according to any one of embodiments 1 to 4. The surface layer has a plurality of convex portions protruding toward the skin side and concave portions arranged between the convex portions. The water-repellent regions are provided on the convex portions. The convex portions protrude toward the skin side and are easy to touch the skin. Since the water-repellent regions are provided on the convex portions that come into contact with the skin, liquid is less likely to remain in the portion that comes into contact with the skin, improving the wearing comfort. In addition, since the water-repellent regions are provided on the convex portions that come into contact with the skin, liquid backflow is less likely to occur in the portion that comes into contact with the skin, and backflowing body fluids can be prevented from touching the skin. 【0013】 According to a preferred embodiment, the invention according to embodiment 6 may have the following features in the invention according to any one of embodiments 1 to 5. In a plan view of the shorts, the recesses are spaced apart and surrounded by the protrusions. According to this embodiment, the recesses are provided in areas surrounded by the protrusions, so that bodily fluids can be guided from the surrounding protrusions to the recesses and moved to the non-skin side. The recesses are surrounded by the protrusions. The protrusions protruding to the skin side come into contact with the skin, and the recesses are less likely to come into contact with the skin. Therefore, the bodily fluids guided to the recesses are less likely to come into contact with the skin, improving the wearing comfort. 【0014】 According to a preferred embodiment, the invention according to embodiment 7 may have the following features in the invention according to any one of embodiments 1 to 6. The absorbent layer is a knitted fabric in which fibers woven into a substrate extending in a planar direction protrude in the thickness direction. The fibers of the absorbent layer are modified cross-section fibers having a diameter of less than 10 μm. According to the absorbent layer of this embodiment, the thickness of the absorbent layer can be easily ensured, and the retention performance of bodily fluids can be improved. In addition, since it is a knitted fabric, it is easy to stretch and can improve the ability to follow the body. In the knitted fabric, the woven fibers are continuously arranged, and bodily fluids can easily diffuse through the continuous fibers, thereby improving the diffusion of bodily fluids. In addition, the modified cross-section fiber has a change in the distance between fibers due to the variation in the fiber cross section, compared to the same cross-section fiber, and the diffusion of bodily fluids can be improved. 【0015】 According to a preferred embodiment, the invention according to embodiment 8 may have the following features in the invention according to any one of embodiments 1 to 7. The retraction region has a low density portion and a high density portion located on the non-skin side of the low density portion and having a higher density than the low density portion. The high density portion is provided in a central region among three equal regions obtained by dividing the absorbent layer in the thickness direction. According to this embodiment, the high density portion is provided in the central region in the thickness direction and is spaced from the non-skin side of the absorbent layer. Therefore, even if bodily fluid is guided to the high density portion, leakage of the bodily fluid from the non-skin side of the absorbent layer can be suppressed. 【0016】 According to a preferred embodiment, the invention according to embodiment 9 may have the following features in the invention according to any one of embodiments 1 to 8. The draw-in region has a low-density portion and a high-density portion that is located on the non-skin-facing side of the low-density portion and has a higher density than the low-density portion. The high-density portion constitutes the diffusion portion. According to this embodiment, since the high-density portion constitutes the diffusion portion, the body fluid that has moved from the low-density portion to the high-density portion can be diffused in a planar direction. By guiding the body fluid to the non-skin-facing side where the high-density portion is located and diffusing it in a planar direction in the high-density portion located on the non-skin-facing side, the draw-in property of the absorbent layer can be improved and liquid residue and return on the skin-facing side of the shorts can be suppressed. 【0017】 According to a preferred embodiment, the invention according to embodiment 10 may have the following features in the invention according to any one of embodiments 1 to 9: A joint is provided to join the surface layer and the absorbent layer. The density of the joint is higher than the density of the surrounding area of ​​the joint. According to this embodiment, since the density of the joint is higher than the surrounding area, bodily fluids are easily guided to the joint, which promotes the movement of bodily fluids from the surface layer to the joint side (from the skin-facing side to the non-skin-facing side), thereby improving the transfer of bodily fluids to the absorbent layer. 【0018】 According to a preferred embodiment, the invention according to embodiment 11 may have the following features in the invention according to any one of embodiments 1 to 10. The density of the entire absorbent layer is lower than the density of the entire surface layer. According to this embodiment, since the density of the entire absorbent layer is relatively low, when the shorts are washed for repeated use, the absorbent layer is easily dried, and the shorts can be easily used repeatedly. 【0019】 According to a preferred embodiment, the invention according to embodiment 12 may have the following features in the inventions according to embodiments 1 to 11. The shorts have a front-to-rear direction and a width direction perpendicular to the front-to-rear direction. The liquid diffusibility of the absorbent layer in the front-to-rear direction is higher than the liquid diffusibility of the absorbent layer in the width direction. According to this embodiment, by diffusing body fluid over a wide range in the front-to-rear direction of the absorbent layer, body fluid can be retained over a wide area, and backflow due to localized liquid retention can be suppressed. 【0020】 (2) Water-absorbent sanitary shorts according to the embodiment Hereinafter, the absorbent sanitary shorts (hereinafter, referred to as shorts 1) according to the embodiment will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the ratios of the dimensions are different from those in reality. Therefore, the specific dimensions should be determined with reference to the following description. In addition, the drawings may include parts with different dimensional relationships and ratios. The shorts 1 are shorts worn during menstruation or when incontinence is to be cared for, and are configured to be repeatedly used by washing. In other words, the shorts are not disposable shorts, but reusable shorts. The shorts are configured to absorb body fluids excreted from the wearer. Examples of body fluids to be absorbed include menstrual blood, urine, and vaginal discharge. The shorts do not need to have pulp and SAP, unlike disposable absorbent articles. 【0021】 1 and 2 are plan views of the shorts 1, where FIG. 1 is a plan view seen from the front side, and FIG. 2 is a plan view seen from the back side. FIG. 3 is a plan view of the crotch region CR of the shorts 1 seen from the skin side, showing the crotch region in a state where the inner side of the shorts is turned over to the outer side. FIG. 4 is a cross-sectional view of the crotch region taken along line AA shown in FIG. 3. FIG. 5 is a cross-sectional view of the crotch region taken along line DD shown in FIG. 3. FIG. 6 is a schematic enlarged view of a part of the shorts, where FIG. 6(a) is a schematic enlarged view of part B in FIG. 4. FIG. 6(b) is a schematic enlarged view of part C in FIG. 3, showing the structure of the surface layer. FIG. 7 is a diagram showing a deformation state when worn based on the cross section shown in FIG. 4. For convenience of illustration, the drawings include a portion where each component is shown separated even at the portion where each component is in contact. 【0022】 In the present invention, the outer portion is a portion that occupies a certain range in the width direction W including the outer edge in the width direction W, and the outer edge is the outer edge in the width direction W. The outer edge of a component that occupies a certain range in the front-rear direction is an edge that connects points located on the outside in the width direction of the component over the entire component. The inner portion in the present invention is a portion that occupies a certain range in the width direction W including the inner edge in the width direction W, and the inner edge is the inner edge in the width direction W. The inner edge of a component that occupies a certain range in the front-rear direction is an edge that connects points located on the inside in the width direction of the component over the entire component. In the present invention, the front end and the rear end are portions that occupy a certain range in the front-rear direction L including edges in the front-rear direction L, and the front end edge and the rear end edge are edges in the front-rear direction L. The outer end includes the front end and the rear end, and the outer end edge includes the front end edge and the rear end edge. The outer edge is a concept that includes the outer end edge and the outer side edge, and the outer edge portion is a concept that includes the outer end and the outer portion. The inner side is a side that includes the inner edge and extends along the front-to-rear direction L. The outer side is a side that includes the outer edge and extends along the front-to-rear direction L. In this specification, the term "along the front-to-rear direction L" means a direction having an angle of less than 45° with respect to the front-to-rear direction L, and the term "along the width direction W" means a direction having an angle of less than 45° with respect to the width direction W. 【0023】 The shorts 1 may have a front-rear direction L along the front-rear direction of the body, a width direction W perpendicular to the front-rear direction L, and a thickness direction T. The thickness direction T is a direction extending to a skin-facing side (inner side) T1 facing the wearer and a non-skin-facing side (outer side) T2 facing the opposite side of the wearer. The planar direction of the shorts 1 is a direction extending in the front-rear direction L and the width direction W. The shorts 1 may have an exterior body 51 that covers the waist of the wearer and an interior body 52 that is placed against the excretory opening and absorbs bodily fluids. The exterior body 51 is disposed on the non-skin-facing side T2 of the interior body 52, and has a function of covering the body of the wearer and placing the interior body 52 against the body. The exterior body 51 has a waist part 55 that covers the waist of the wearer and a leg part 56 that covers the legs of the wearer. The exterior body 51 may be made of, for example, cloth, but the material is not particularly limited, and for example, a cloth containing nylon and polyurethane can be exemplified. The outer casing 51 of this embodiment has a first outer casing 511, a second outer casing 512 located on the non-skin side T2 of the first outer casing 511, and a pressing portion 60 located between the first outer casing 511 and the second outer casing 512. 【0024】 The inner body 52 is disposed on the skin-facing side T1 of the outer body 51 and has a function of absorbing bodily fluids. The inner body 52 has at least a surface layer 10 and an absorbent layer 20 disposed on the non-skin-facing side T2 of the surface layer 10. The inner body 52 may have a waterproof layer 30 disposed on the non-skin-facing side T2 of the absorbent layer 20. That is, the inner body 52 may be configured to include the surface layer 10, the absorbent layer 20, and the waterproof layer 30. The inner body 52 may be integrated by a side joint 48 described later. In another embodiment, the waterproof layer 30 may be provided on the outer body 51. The surface layer 10 is located on the skin-facing side T1 of the inner body 52 and abuts against the wearer. The absorbent layer 20 absorbs (holds) bodily fluids introduced from the surface layer 10. The absorbent layer 20 has fibers and is configured to temporarily absorb bodily fluids by holding the bodily fluids in gaps between the fibers. The shorts 1 are configured so that the body fluid between the fibers is removed by washing the shorts 1, and the moisture between the fibers evaporates by drying the shorts, and the absorbent layer 20 returns to the state before absorbing the body fluid. The waterproof layer 30 may be a liquid-impermeable sheet and may be mainly composed of non-absorbent fibers. The non-absorbent fibers will be described in detail later. The waterproof layer 30 is arranged to cover the entire non-skin side of the absorbent layer 20. The waterproof layer 30 of this embodiment is composed of a polyester sheet and a polyurethane sheet laminated on the polyester sheet. The waterproof layer 30 may be arranged so as to directly cover the non-skin side of the absorbent layer 20, or may indirectly cover the non-skin side of the absorbent layer 20 via another member between the absorbent layer 20 and the waterproof layer 30. 【0025】 The shorts 1 may have a crotch region CR disposed between the front edge and the rear edge of the absorbent layer 20, a front region located forward of the crotch region CR, and a rear region located rear of the crotch region. The shorts 1 may have a crotch center CRC. The crotch region CR is an area that corresponds to the wearer's urine or menstrual blood excretion opening and is an area that is placed between the wearer's crotch. The range of the crotch region CR in the front-rear direction L may be the range in which the absorbent layer 20 is disposed. That is, the front edge of the crotch region CR coincides with the front edge of the absorbent layer 20, and the rear edge of the crotch region CR coincides with the rear edge of the absorbent layer 20. The crotch region CR may have a crotch center region CR3 located in the center of the areas obtained by dividing the crotch region CR into three equal parts in the front-rear direction L, a front crotch region CR1 located in the front of the three equal parts, and a rear crotch region CR2 located in the rear of the three equal parts. The three equal-divided regions may be regions obtained by dividing the length at the center of the width direction W of the crotch region CR into three equal parts. In Fig. 5, the ranges in the front-to-back direction L of the crotch region CR, the front crotch region CR1, the back crotch region CR2, and the central crotch region CR3 are shown. The crotch center CRC is located at the center of the width direction W of the crotch region CR and at the center of the front-to-back direction L, and is located within the central crotch region CR3. The inner body 52 may be disposed in the crotch region CR of the shorts 1. The inner body 52 and the outer body 51 may be disposed in the crotch region CR, and only the outer body 51 may be disposed in front of and behind the crotch region CR, without the inner body 52. 【0026】 The inner body 52 does not have to be joined to the outer body 51 over its entire surface. As shown in Fig. 5, an outer joint portion 58 where the inner body 52 and the outer body 51 are joined, and an outer non-joined portion 59 where the inner body 52 and the outer body 51 overlap without being joined may be provided. The outer joint portion 58 in this embodiment is provided at a crotch front edge portion including a front end edge of the crotch region CR and extending in the width direction, and at a crotch rear edge portion including a rear end edge of the crotch region CR and extending in the width direction W. The outer non-joined portion 59 is provided between the outer joint portion 58 at the crotch front end and the outer joint portion 58 at the crotch rear end. 【0027】 The shorts 1 have a pressing part 60 that is disposed on the non-skin facing side T2 of the absorbent layer 20 and presses the absorbent layer 20 to the skin facing side T1. The pressing part 60 may be disposed along the front-rear direction L or the width direction W. The pressing part 60 is disposed on the non-skin facing side T2 of the absorbent layer 20 and presses the absorbent layer 20 from the non-skin facing side T2 toward the skin facing side T1. The pressing part 60 may be made of a member having elasticity such as rubber thread, flat rubber having a predetermined width, or an elastic sheet, or may be made of a combination of a non-elastic member that does not have elasticity (e.g., a non-elastic string) and an elastic sheet that is disposed on the non-skin facing side of the non-elastic member, or may be made of a portion of the exterior body 51 coated with an elastic material (e.g., urethane). The pressing part 60 may be attached to the interior body 52 (e.g., the waterproof layer 30) or to the exterior body 51. The pressing portion 60 may be a rubber containing nylon and polyurethane. 【0028】 The pressing portion 60 may be made of an elastic member arranged on the non-skin facing side T2 of the absorbent layer 20. The absorbent layer can be pressed against the skin facing side by the elastic member stretching, and the convex portion can fit to the body. In another embodiment, the pressing portion may be made of a non-elastic member arranged on the non-skin facing side of the absorbent layer. When the pressing portion is made of a non-elastic member, the pressing portion is provided on the exterior body, and the strength of the exterior body in the crotch region at 10% elongation may be lower than the strength of the interior body in the crotch region at 10% elongation. In this configuration, the pressing portion is made of a non-elastic member, and since the exterior body in which the pressing portion is provided is easily stretchable, the region in which the non-elastic member is present can press the absorbent layer against the skin by the elasticity of the exterior body, and can fit in a convex shape. In a configuration in which the pressing portion is constituted by a non-elastic member, preferably, a stretchable region of the sheet is disposed so as to cover the non-skin side of the non-elastic member, and the non-elastic member is pressed by the stretchable region. In another configuration, the non-skin side of the non-elastic member is covered by a non-elastic region of the sheet, and the non-elastic member is pressed by a stretchable region continuous with the non-elastic region. 【0029】 Next, the configuration for improving the diffusion of bodily fluids and suppressing the return of fluid in the shorts 1 thus constructed will be described in detail. The surface layer 10 and the absorbent layer 20 mainly contain non-absorbent fibers. Here, the non-absorbent fibers are fibers that are difficult to absorb moisture and include fibers that absorb a small amount of moisture. Specifically, the non-absorbent fibers are fibers with a nominal moisture regain of 5% or less. The nominal moisture regain is a value indicating the moisture regain in the fiber in an environment of a temperature of 20°C and a humidity of 65%. Examples of fibers with a nominal moisture regain of 5% or less include promix, vinylon, nylon, triacetate, polychlor, acrylic, polyurethane, polylactic acid, polyester, polyethylene, polypropylene, vinylidene, and polyvinyl chloride. On the other hand, examples of fibers with a nominal moisture regain of more than 5% include wool, hemp, silk, rayon, polynosic, cupra, cotton, and acetate. In the present invention, "mainly containing" means containing 50% by mass or more. Therefore, when the total mass of the surface layer 10 is taken as 100%, 50% by mass or more of the surface layer 10 is non-absorbent fiber, and when the total mass of the absorbent layer 20 is taken as 100%, 50% by mass or more of the surface layer 10 is non-absorbent fiber. According to this embodiment, the surface layer 10 and the absorbent layer 20 mainly contain non-absorbent fiber, and compared with a configuration mainly containing absorbent fiber, the fiber itself is less likely to retain body fluid, and the diffusion of body fluid can be improved. The surface layer 10 may preferably contain 75% by mass or more of non-absorbent fiber, more preferably 90% by mass of non-absorbent fiber, or may be composed only of non-absorbent fiber (without absorbent fiber). Similarly, the absorbent layer 20 may preferably contain 75% by mass or more of non-absorbent fiber, more preferably 90% by mass of non-absorbent fiber, or may be composed only of non-absorbent fiber (without absorbent fiber). 【0030】 The water repellency of the skin surface of the surface layer 10 is higher than that of the non-skin surface of the surface layer 10. According to this embodiment, since the water repellency of the non-skin surface of the surface layer 10 is relatively low, the body fluid drawn into the surface layer 10 is easily guided to the absorbent layer 20. In addition, since the water repellency of the skin surface of the surface layer 10 is relatively high, the body fluid drawn into the surface layer 10 can be prevented from returning. The water repellency can be compared by the magnitude of the contact angle. The contact angle can be measured, for example, by the following method. (1) The test piece is left to stand for 24 hours in a constant temperature and humidity chamber at a temperature of 20±5°C and a humidity of 65±5%RH. (2) The water contact angle of the test piece is measured in accordance with 6. Sessile drop method of JIS R 3257:1999 "Test method for wettability of substrate glass surface". An example of a contact angle measuring device is an automatic contact angle meter CA-V type manufactured by Kyowa Interface Science Co., Ltd. (3) The measurement is performed 10 times at different locations on the test piece, and the average value is adopted as the contact angle. The amount of water droplets and the measurement time after the water droplets are left on the test piece may be changed depending on the water repellency of the test piece. The configuration for making the water repellency of the skin surface of the surface layer 10 different from the water repellency of the non-skin surface of the surface layer 10 is not particularly limited. For example, the skin surface of the surface layer 10 may be subjected to a water repellent treatment such as application of a water repellent agent, the non-skin surface of the surface layer 10 may be subjected to a hydrophilic treatment, or both the skin surface of the surface layer 10 and the non-skin surface of the surface layer 10 may be subjected to a hydrophilic treatment. The area of ​​the skin surface of the surface layer 10 that has a higher water repellency than the non-skin surface of the surface layer 10 constitutes the water repellent area R10 shown in FIG. 6(a). The water repellent area R10 may be an area that has been subjected to a water repellent treatment. More preferably, the water repellency may be measured and compared by the following method. Stack five sheets of filter paper on a horizontal table and place the sample on top of them. Drop 5μl of ion-exchanged water with a microsyringe. Leave for 5 seconds after dropping, then check to see if the sample has been absorbed or passed through. Do this in 20 places and count the number of places where the sample has been absorbed or passed through. The lower the number, the higher the water repellency, and the higher the number, the lower the water repellency. 【0031】 The absorbent layer 20 has a retraction region 25 in which the density increases from the skin-facing side T1 toward the non-skin-facing side T2. The retraction region 25 is a region of a certain range extending in the thickness direction T, and is configured to include a low-density portion 21 having a relatively low density, and a high-density portion 22 located on the non-skin-facing side T2 from the low-density portion 21 and having a higher density than the low-density portion 21. The retraction region 25 has a diffusion portion 27 containing fibers oriented in the planar direction. The diffusion portion 27 contains fibers oriented in the planar direction, and is easy to diffuse body fluids in the planar direction. In the retraction region 25, the movement of the body fluid introduced into the absorbent layer 20 from the low-density portion 21 to the high-density portion 22 is promoted, and while being introduced to the non-skin-facing side, the body fluid is diffused in the planar direction by the fibers oriented in the planar direction of the diffusion portion, and is retained over a wide range. It is possible to suppress the return of the liquid due to the local retention of the body fluid. The diffusion portion 27 may contain some fibers oriented in the thickness direction T, etc., or may be mainly composed of fibers oriented in the planar direction. Moreover, the diffusing portion 27 may be a part of the lead-in region 25, or may be the entirety of the lead-in region 25. Preferably, the diffusing portion 27 may mainly contain fibers oriented in a planar direction. 【0032】 The body fluid discharged onto the skin surface of the surface layer 10 is guided from the surface layer 10 to the absorbent layer 20. At this time, the water repellency of the non-skin surface (the surface on the absorbent layer 20 side) of the surface layer 10 is relatively low, and the water is easily guided from the surface layer 10 to the absorbent layer 20 quickly and smoothly. In addition, since the surface layer 10 and the absorbent layer 20 are mainly made of non-absorbent fibers, the body fluid can be prevented from accumulating and the diffusion of the body fluid can be promoted, and the return of the body fluid caused by the local accumulation of the body fluid can be prevented, compared with the shorts 1 in which the surface layer 10 and the absorbent layer 20 are mainly made of absorbent fibers. Since the surface layer 10 is mainly made of non-absorbent fibers, the liquid is unlikely to remain. Therefore, the body fluid can be quickly guided from the surface layer 10 to the absorbent layer 20 side, thereby improving the texture and the wearing comfort. The body fluid that reaches the inside of the absorbent layer 20 is guided to the non-skin side T2 by the drawing-in region 25. Therefore, bodily fluids are less likely to accumulate in the absorbent layer 20 in the area close to the surface layer 10, and the return of the bodily fluids to the surface layer 10 can be suppressed. Furthermore, since the drawing-in region 25 is provided with the diffusion portion 27, the bodily fluids can be diffused over a wide range in the planar direction during the process of guiding the bodily fluids to the non-skin facing side T2 or after being guided to the non-skin facing side T2. By retaining the bodily fluids over a wide range in the planar direction of the absorbent layer 20, the return of the bodily fluids due to localized retention of the bodily fluids can be suppressed. 【0033】 The nominal moisture regain of the non-absorbent fiber of the surface layer 10 may be less than 1%. Fibers with a nominal moisture regain of less than 1% have a small amount of moisture during normal use such as wearing, suppressing stickiness of the surface layer 10 that touches the skin and improving the wearing comfort. Fibers with a nominal moisture regain of less than 1% are less likely to retain bodily fluids, and can further promote the diffusion of bodily fluids and improve the drawing ability. The surface layer 10 is mainly composed of non-absorbent fibers, and the non-absorbent fibers may include fibers with a nominal moisture regain of less than 1%. Therefore, the surface layer 10 may include fibers with a nominal moisture regain of 1% or more. Preferably, when the entire non-absorbent fiber of the surface layer 10 is taken as 100% by mass, fibers with a nominal moisture regain of less than 1% may account for 50% by mass. Preferably, the non-absorbent fiber of the surface layer 10 may be 75% by mass or more of fibers with a nominal moisture regain of less than 1%, more preferably 90% by mass or more of fibers with a nominal moisture regain of less than 1%, and may be composed only of non-absorbent fibers with a nominal moisture regain of less than 1% (without fibers with a nominal moisture regain of 1% or more). Examples of fibers with a nominal moisture regain of less than 1% include polyurethane, polylactic acid, polyester, polyethylene, polypropylene, vinylidene, and polyvinyl chloride. The fiber of the surface layer 10 may be 100% by mass of polyester (nominal moisture regain of 0.4%). Alternatively, the fiber of the surface layer 10 may be 100% by mass of nylon (nominal moisture regain of 4.5%) and polyurethane (nominal moisture regain of 1%). That is, the fiber of the surface layer 10 may be 100% by mass of non-absorbent fibers. 【0034】 The nominal moisture regain of the non-absorbent fiber of the absorbent layer 20 may be less than 1%. Fibers with a nominal moisture regain of less than 1% are less likely to retain bodily fluids, and can further promote the diffusion of bodily fluids, improving the drawability. The absorbent layer 20 is mainly composed of non-absorbent fibers, and the non-absorbent fibers may contain fibers with a nominal moisture regain of less than 1%. Therefore, the absorbent layer 20 may contain fibers with a nominal moisture regain of 1% or more. Preferably, when the total non-absorbent fibers of the absorbent layer 20 are taken as 100% by mass, the fibers with a nominal moisture regain of less than 1% may account for 50% by mass. Preferably, the non-absorbent fibers of the absorbent layer 20 may be 75% by mass or more of fibers with a nominal moisture regain of less than 1%, more preferably 90% by mass or more of fibers with a nominal moisture regain of less than 1%, and may be composed only of non-absorbent fibers with a nominal moisture regain of less than 1% (without fibers with a nominal moisture regain of 1% or more). The fibers of the absorbent layer 20 may be 80% by mass of polyester (official moisture regain 0.4%) and 20% by mass of nylon (official moisture regain 4.5%), and the total of both fibers may be 100% by mass. In addition, in the surface layer 10 of this embodiment, the fibers of the low density portion 21 described later may be 100% by mass of polyester (official moisture regain 0.4%), and the fibers of the high density portion 22 described later may be 80% by mass of polyester (official moisture regain 0.4%) and 20% by mass of nylon (official moisture regain 4.5%). In other words, the fibers of the absorbent layer 20 may be 100% by mass of non-water-absorbent fibers. 【0035】 In a plan view of the shorts, the area of ​​the water-repellent region R10 on the skin surface of the surface layer 10 may be 50% or more and 90% or less of the entire skin surface of the surface layer 10. According to this embodiment, since the area ratio of the water-repellent region R10 is 50% or more, it is possible to suppress liquid return in about half of the area. Also, since the area ratio of the water-repellent region R10 is 90% or less, it is possible to draw body fluids to the non-skin facing side T2 in at least 10% of the area, thereby ensuring the ability to draw in body fluids. 【0036】 As shown in FIG. 6(a), the surface layer 10 may have a plurality of convex portions 11 protruding toward the skin side T1 and concave portions 12 arranged between the convex portions 11. The water-repellent regions R10 may be provided on the convex portions 11. More specifically, the water-repellent regions R10 may be provided on the tops of the convex portions 11 (portions protruding toward the skin side). Preferably, the water-repellent regions R10 are provided only on the convex portions 11, and are not required to be provided on the concave portions 12. The convex portions 11 protrude toward the skin side T1 and are easy to touch the skin. Since the water-repellent regions R10 are provided on the convex portions 11 that come into contact with the skin, liquid is unlikely to remain in the portions that come into contact with the skin, improving the wearing comfort. In addition, since liquid return is unlikely to occur in the portions that come into contact with the skin, it is possible to prevent the returned body fluid from touching the skin. 【0037】 As shown in FIG. 6(b), the convex portions 11 and the concave portions 12 may be alternately arranged with a gap in a plan view. For example, the convex portions 11 and the concave portions 12 may be arranged in a row and alternately arranged in rows. However, preferably, the concave portions 12 may be arranged with a gap and surrounded by the convex portions 11. The convex portions 11 surrounding the concave portions 12 may be connected, and the concave portions may be arranged with a gap in between within the convex portions 11. Since the concave portions 12 are provided in the area surrounded by the convex portions 11, bodily fluids can be guided from the surrounding convex portions 11 to the concave portions 12 and moved to the non-skin side T2. The concave portions 12 are surrounded by the convex portions 11. The convex portions 11 protruding to the skin side T1 touch the skin, and the concave portions 12 are unlikely to touch the skin. Therefore, the bodily fluids guided to the concave portions 12, which are non-water-repellent areas, are unlikely to touch the skin, improving the wearing comfort. 【0038】 As shown in FIG. 6(a), the absorbent layer 20 may be a knitted fabric in which fibers woven into a base material extending in a planar direction protrude in the thickness direction. The fibers protruding in the thickness direction T are continuous and arranged in a loop. According to the absorbent layer 20 being a knitted fabric in which fibers protrude in the thickness direction T, it is easy to ensure the thickness of the absorbent layer 20, and the bodily fluid retention performance can be improved. In addition, since it is a knitted fabric, it is easy to stretch, and the ability to conform to the body can be improved. In the knitted fabric, the woven fibers are arranged continuously, and the diffusion of bodily fluids can be improved. 【0039】 The fibers constituting the knitted fabric may be modified cross-section fibers having a diameter of less than 10 μm. Modified cross-section fibers are fibers whose cross sections are not substantially circular, but are divided or chipped, and whose cross sections differ from fiber to fiber. More specifically, modified cross-section fibers have V-shaped grooves extending in the axial direction in the fiber cross-section, and the grooves become shorter as they approach the tip of the fiber, so that the distance between fibers becomes closer. Therefore, compared to fibers with the same cross-section, there is a change in the distance between fibers, which can improve the diffusion of body fluids. 【0040】 In the absorbent layer 20 of the present embodiment, loop-shaped fibers are arranged on both the skin side T1 and the non-skin side T2 of the sheet-like substrate. The portion where the loop-shaped fibers are arranged has a lower density than the substrate, and constitutes a low-density portion 21. The substrate has a higher density than the portion where the loop-shaped fibers are arranged, and constitutes a high-density portion 22. The region consisting of the high-density portion 22 made of the substrate and the low-density portion 21 located on the skin side T1 of the substrate has a higher density from the skin side T1 to the non-skin side, and constitutes a pull-in region 25. 【0041】 The high density portion 22 of the retraction region 25 may be provided in a central region among the regions obtained by dividing the absorbent layer 20 into three equal parts in the thickness direction. Since the high density portion 22 is provided in the central region in the thickness direction T of the absorbent layer 20, even if bodily fluid is guided to the high density portion 22, it is distant from the non-skin surface of the absorbent layer 20, and leakage from the non-skin surface of the absorbent layer 20 can be suppressed. Preferably, the high density portion 22 may be provided only in the central region. In addition, low density portions may be provided on both the skin surface side T1 and the non-skin surface side T2 of the high density portion 22. According to these configurations, leakage of bodily fluid from the non-skin surface of the absorbent layer 20 can be further suppressed. 【0042】 The high density portion 22 may constitute the diffusion portion 27. That is, the high density portion 22 mainly contains fibers oriented in the planar direction. Since the high density portion 22 constitutes the diffusion portion 27, the body fluid that has moved from the low density portion 21 to the high density portion can be diffused in the planar direction. By guiding the body fluid to the non-skin facing side T2 and diffusing it in the planar direction in the high density portion 22 located on the non-skin facing side T2, the drawing ability of the absorbent layer 20 in the thickness direction T can be improved, and the liquid remaining on the skin side of the shorts 1 and the liquid returning can be suppressed. 【0043】 The shorts 1 may have a crotch joint 40 that joins the surface layer 10 and the absorbent layer 20. The crotch joint 40 is a part where the surface layer 10 and the absorbent layer 20 are joined, and may be, for example, a part that is sewn or welded (thermal welding or ultrasonic welding). The crotch joint 40 may at least join the non-skin side of the surface layer 10 and the skin side of the absorbent layer 20, or may join the entire area of ​​the surface layer 10 in the thickness direction T and the entire area of ​​the absorbent layer 20 in the thickness direction T. The crotch joint 40 of this embodiment is composed of a part where the surface layer 10 and the absorbent layer 20 are sewn together over the entire thickness direction T. The crotch joint 40 joins the surface layer 10 and the absorbent layer 20, but does not join the waterproof layer 30. The density of the crotch joint 40 may be higher than that of the surrounding area of ​​the crotch joint 40. Since the density of the crotch joint 40 is higher than the surrounding density, bodily fluids are easily guided to the crotch joint 40, promoting the movement of bodily fluids from the surface layer 10 to the crotch joint 40 side, and improving the transfer of bodily fluids to the absorbent layer 20. 【0044】 The density of the entire absorbent layer 20 may be lower than the density of the entire surface layer 10. According to this embodiment, since the density of the entire absorbent layer 20 is relatively low, when the absorbent layer 20 is washed for repeated use, it is easy to dry the absorbent layer 20 and easy to use repeatedly. As a modified example, the density of the entire surface layer 10 may be lower than the density of the entire absorbent layer 20. According to this modified example, liquid is easily transferred from the surface layer 10 side, which has a relatively low density, to the absorbent layer 20 side, which has a relatively high density, and the ability to draw body fluids to the non-skin side can be improved. The average fiber diameter of the absorbent layer may be smaller than the average fiber diameter of the surface layer. The fiber diameter of the absorbent layer is relatively small, and the density of the absorbent layer is configured to be low. 【0045】 The liquid diffusibility in the front-rear direction L of the absorbent layer 20 may be higher than the liquid diffusibility in the width direction W of the absorbent layer 20. By diffusing the body fluid over a wide range in the front-rear direction L of the absorbent layer 20, the body fluid can be retained over a wide area, and liquid backflow caused by localized liquid retention can be suppressed. The liquid diffusibility can be compared by dropping colored water and comparing the area (diffusion area) over which the colored water is diffused. 【0046】 Next, a configuration for suppressing leakage of bodily fluids while improving the fit of the shorts 1 in the crotch region CR thus configured will be described in detail. The crotch region CR is provided with a crotch joint 40 and a crotch non-joined portion 45 in which the surface layer 10, the absorbent layer 20, and the waterproof layer 30 are not joined to each other. The crotch joint 40 joins only the surface layer 10 and the absorbent layer 20 among the surface layer 10, the absorbent layer 20, and the waterproof layer 30. The crotch joint 40 and the crotch non-joined portion 45 are provided on the inner body 52. ​​The crotch joint 40 only needs to join at least the surface layer 10 and the absorbent layer 20. In a configuration in which other components than the surface layer 10 and the absorbent layer 20 are provided on the skin-facing side T1 of the waterproof layer 30, the crotch joint 40 may also join the other components. The crotch non-joined portion 45 is a region where the surface layer 10, the absorbent layer 20, and the waterproof layer 30 are not joined to one another, and may be provided adjacent to the crotch joint portion 40. The crotch joint portion 40 is arranged on both sides of the crotch center CRC in the first direction. The first direction is one of the front-rear direction L and the width direction W. The crotch non-joined portion 45 is arranged between the crotch joint portions 40 in the first direction, overlapping the pressing portion 60. It is sufficient that the pressing portion 60 overlaps at least a portion of the crotch non-joined portion 45. 【0047】 The provision of the crotch joint 40 suppresses the displacement of the surface layer 10 that contacts the body in the crotch region CR, improving the fit of the surface layer 10. The crotch joint 40 is disposed on both sides of the crotch center CRC, and the surface layer 10 does not shift relative to the absorbent layer 20 on both sides of the crotch center CRC, so that the displacement of the surface layer 10 at the crotch center CRC can be suppressed. In addition, the crotch joint 40 has a higher rigidity than the crotch non-joined portion 45. Therefore, by providing the crotch joint 40, the twisting of the crotch region CR can be suppressed, and the crotch region CR can be kept in contact with the body, thereby suppressing the leakage of bodily fluids. In addition, as shown in FIG. 7, when worn, the crotch non-joined portion 45 disposed between the crotch joints 40 is likely to rise toward the wearer from the crotch joint 40 as a base point, and the absorbent layer 20 and the surface layer 10 are further pushed up toward the body by the pressing portion 60, improving the fit to the body. Of the surface layer 10, the absorbent layer 20, and the waterproof layer 30, the crotch joint 40 only joins the surface layer 10 and the absorbent layer 20, but does not join the waterproof layer 30. This prevents bodily fluids absorbed in the surface layer 10 and the absorbent layer 20 from reaching the waterproof layer 30 via the crotch joint 40, thereby preventing leakage of bodily fluids. 【0048】 The outer edge of the crotch region CR may be provided with an outer edge joining portion where the surface layer 10, the absorbent layer 20 and the waterproof layer 30 are joined. The outer edge joining portion may have a side joining portion 48 where the surface layer 10, the absorbent layer 20 and the waterproof layer 30 are joined at the outer portion of the inner body 52, and an end joining portion 49 where the surface layer 10, the absorbent layer 20 and the waterproof layer 30 are joined at the outer end of the inner body 52. ​​The side joining portion 48 and the end joining portion 49 are located on the non-skin side of the skin side of the shorts and on the skin side of the non-skin side of the shorts, and are configured so as not to be visible when viewed from the skin side of the shorts or when viewed from the non-skin side of the shorts. Since the side joining portion 48 and the end joining portion 49 are not exposed to the skin side or non-skin side of the shorts, discomfort caused by the outer edge joining portion touching the skin can be suppressed. In the cross-sectional views shown in FIG. 4 and FIG. 5, the side joints 48 and the end joints 49 are illustrated. The side joints 48 extend in the front-rear direction L along the outer side of the inner body 52. ​​The end joints 49 extend in the width direction W at the front end and the rear end of the inner body 52. ​​The side joints 48 and the end joints 49 are continuous. Therefore, the side joints 48 and the end joints 49 are arranged to surround the entire outer periphery of the inner body 52, and join the surface layer 10, the absorbent layer 20, and the waterproof layer 30 over the entire outer periphery of the inner body 52. ​​The crotch joints 40 and the crotch non-joined portion 45 are provided within the area surrounded by the side joints 48 and the end joints 49. The waterproof layer 30 is not joined to the surface layer 10 and the absorbent layer 20 in areas other than the side joints 48 and the end joints 49. The configurations of the side joints 48 and the end joints 49 will be described in detail later. The crotch joints 40 of this embodiment are arranged in a pair with a gap in the width direction W. The crotch non-joined parts 45 of this embodiment are provided in the region between the side joints 48 and the crotch joints 40 and in the region between the pair of crotch joints 40 in the width direction W, and are provided continuously between the end joints 49 located at the front end of the inner body 52 and the end joints 49 located at the rear end of the inner body 52 in the front-rear direction L. 【0049】 Preferably, the first direction may be the width direction W. That is, the crotch joints 40 may be disposed on both sides of the crotch center CRC in the width direction W, and the crotch non-joined parts 45 may be disposed between the crotch joints 40 in the width direction W. According to this embodiment, a convex shape that protrudes toward the skin side T1 can be formed in the center of the width direction W of the crotch region CR, starting from the crotch joints 40 located on both sides of the width direction W of the crotch center CRC. The convex shape is easily formed by the surface layer and the absorbent layer joined by the crotch joints 40. The convex shape can improve the fit to the vaginal opening, improve the attraction of bodily fluids, and suppress leakage. In a modified example, the first direction may be the front-rear direction L. That is, the crotch joints 40 may be disposed on both sides of the crotch center CRC in the front-rear direction L, and the crotch non-joined parts 45 may be disposed between the crotch joints 40 in the front-rear direction L. 【0050】 The crotch joint 40 and the crotch non-joined portion 45 may extend in the front-rear direction L. Since the crotch joint 40 and the crotch non-joined portion 45 extend in the front-rear direction, the fit to the body can be improved over a continuous range in the front-rear direction L. In addition, the crotch joint 40 extending in the front-rear direction L serves as a continuous base point, making it easy to raise the area sandwiched between the crotch joints in the width direction W toward the skin side and form a convex shape continuously in the front-rear direction. In addition, the convex shape propagates backward, improving the fit to the gluteal cleft and suppressing rear leakage. 【0051】 The pair of crotch joints 40 may extend parallel to each other. That is, the length in the width direction W of the crotch non-joined portion 45 between the crotch joints 40 may be constant. As shown in FIG. 3, the width direction length of the crotch region CR varies in the front-rear direction L, and the width direction length of the crotch central region CR3 is short, and it is longer from the crotch central region CR3 toward the outside in the front-rear direction L. Therefore, the length in the width direction W of the crotch non-joined portion 45 between the crotch joint 40 and the side joint 48 may vary, and the length in the width direction W of the crotch central region CR3 is short, and it is longer from the crotch central region CR3 toward the outside in the front-rear direction L. In addition, in order to more easily function as a base point for forming a convex shape, the interval in the width direction W of the pair of crotch joints 40 may be 5 mm or more. In addition, the crotch joints 40 may be provided on both sides in the width direction sandwiching the crotch center CRC, and may be provided at multiple points on both sides in the width direction sandwiching the crotch center CRC, not just one point on each side. 【0052】 The crotch joint 40 may be continuous from the front edge of the crotch region CR to the rear edge of the crotch region CR. The crotch joint 40 joins the surface layer 10 and the absorbent layer 20 over the entire area of ​​the crotch region CR in the front-to-rear direction L, and can suppress twisting of the surface layer 10 and the absorbent layer 20. By suppressing twisting of the surface layer 10, the surface layer 10 can be brought into contact with the crotch of the wearer to ensure the absorption of bodily fluids. Furthermore, by suppressing twisting of the absorbent layer 20, the absorption area of ​​bodily fluids can be ensured. The crotch joint 40 of this embodiment reaches the end joint 49 located at the front end of the inner body 52, and also reaches the end joint 49 located at the rear end of the inner body 52. 【0053】 The pressing portion 60 may extend in the front-rear direction L. According to this embodiment, the pressing portion 60, the crotch joint 40, and the crotch non-joint 45 extend in the same front-rear direction L, so that a convex shape is formed over a continuous range in the front-rear direction L, and the fit to the body can be further improved. The pressing portion 60 may be disposed at the center of the width of the crotch region. The center of the width direction W of the crotch region CR can be pushed up to the skin side T1 by the pressing portion 60. This can further improve the fit to the vaginal opening and the fit to the intergluteal cleft. The pressing portion 60 may be disposed at a distance from the crotch joint 40 in the width direction. The region to be pushed up in a convex shape (the region where the pressing portion 60 is disposed) and the region that is the base point for pushing up in a convex shape (the region where the crotch joint 40 is disposed) are separated in the width direction W, so that each function can be easily performed. The interval between the pressing portion 60 and the crotch joint portion 40 may be, for example, 10 mm or more and 40 mm or less, and preferably 10 mm or more and 25 mm or less. In a form in which the pressing portion 60 has a constant width direction, the pressing portion 60 may be arranged across the center of the width direction W of the crotch region CR. In a form in which the pressing portions 60 are arranged at intervals in the width direction within a predetermined interval, an assembly of the pressing portions arranged at intervals may be arranged across the center of the width direction W of the crotch region CR. The predetermined interval of the pressing portions 60 constituting the assembly may be 10 mm or less. The pressing portions may be joined to the first exterior body and the second exterior body 512 so that their length is 85% to 95% of the length before joining. In addition, the length of the pressing portion 60 in the width direction W may be 5 mm to 20 mm in the crotch region CR. The length of the pressing portion 60 in the width direction W may be longer from the crotch region CR toward the rear side. The maximum length in the width direction of the pressing portion 60 in the rear region may be 55 mm or less. The pressing portion 60 in this embodiment is a flat rubber member having a width of 10 mm, and is joined to the first exterior body 511 and the second exterior body 512 so that the length is 90% of the length before joining. The material of the pressing portion 60 is not particularly limited, and examples thereof include rubber containing nylon and polyurethane. 【0054】 As shown in FIG. 5, the front edge of the pressing portion 60 may be located behind the front edge of the crotch region CR. That is, the pressing portion 60 may not be located at the front edge of the crotch region CR. The front edge of the pressing portion 60 may be located behind the front edge of the crotch joint 40. Since the front edge of the pressing portion 60 is located behind the front edge of the crotch region CR, an area that does not overlap with the pressing portion 60 is provided in the front part of the absorbent layer 20. The front part of the absorbent layer 20 is unlikely to be disposed opposite the excretory opening, and there is little need to press it against the body. The front part of the absorbent layer 20 can be made relatively flat to cover the body, and the absorbent layer 20 can cover the body in a surface area. In the area where the absorbent layer 20 and the pressing portion 60 overlap, the pressing portion 60 is pressed against the body side by the expansion and contraction of the pressing portion 60, thereby reducing the gap between the body and the shorts. In addition, wrinkles due to the stretching of the pressing portion 60 are unlikely to form in the front portion of the crotch region CR, improving the aesthetic appearance of the shorts. The distance between the front edge of the pressing portion 60 and the front edge of the crotch region CR may be 10 mm or more and 130 mm or less. Since the distance between the front edge of the pressing portion 60 and the front edge of the crotch region CR is 10 mm or more, an area that forms a flat shape in the front portion of the absorbent layer 20 can be ensured. Furthermore, since the distance between the front edge of the pressing portion 60 and the front edge of the crotch region CR is 130 mm or less, the fit of the front portion of the absorbent layer 20 can be ensured and front leakage can be suppressed. 【0055】 The rear edge of the pressing portion 60 may be located rearward of the rear edge of the crotch region CR. The pressing portion 60 may be provided continuously in the front-to-rear direction L across the rear edge of the crotch region CR. Since the pressing portion 60 extends rearward of the rear edge of the absorbent layer 20, the rear edge of the absorbent layer 20 can be fitted to the body and rear leakage can be suppressed. The rear edge of the pressing portion 60 may extend to the waist portion 55. In a modified example, the pressing portion 60 may be continuous from the front edge of the crotch region CR to the rear edge of the crotch region CR. The pressing portion 60 forms a convex shape over the entire area of ​​the crotch region CR in the front-to-rear direction L, thereby further improving the fit to the body. 【0056】 The surface layer 10, the absorbent layer 20, and the waterproof layer 30 are stretched and pressed in accordance with the movement of the body when worn, and are repeatedly deformed when worn. As a result of intensive research by the applicant, it was found that when the wearer is standing or sitting, the surface layer 10, the absorbent layer 20, and the waterproof layer 30 tend to stretch in the front-to-back direction L by 1.1 times, assuming that the natural state is 1.0 times. It was also found that when the wearer is walking, exercising, or crossing his / her legs, the surface layer 10, the absorbent layer 20, and the waterproof layer 30 tend to stretch in the front-to-back direction L by 1.5 times, assuming that the natural state is 1.0 times. 【0057】 The strength of the surface layer 10 in the crotch central region CR3 at 10% elongation is lower than the strength of the absorbent layer 20 in the crotch central region CR3 at 10% elongation and is lower than the strength of the waterproof layer 30 in the crotch central region CR3 at 10% elongation. The strength of the crotch central region CR3 at 10% elongation is the strength when the crotch central region CR3 is elongated 1.0 to 1.1 times in the front-to-back direction L by the following measurement method. The crotch central region CR3 is particularly required to fit the excretory opening, and it is important that it fits into the gaps of the body. The surface layer 10 is more stretchable than the absorbent layer 20 in the crotch central region CR3 and is more likely to follow the movement of the body. The surface layer 10 is easily deformed into a convex shape by the expansion and contraction of the pressing part 60 and is easily kept fitting to the vaginal opening. The absorbent layer 20 is less stretchable than the surface layer 10 in the crotch central region CR3, and supports the surface layer 10 from the non-skin-facing side T2 of the surface layer 10, thereby maintaining the shape of the surface layer 10 and suppressing leakage. The strength of the waterproof layer 30 in the crotch central region CR3 at 10% elongation is lower than the strength of the absorbent layer 20 in the crotch central region CR3 at 10% elongation, and the waterproof layer 30 is less stretchable than the surface layer 10. Since the surface layer 10 is relatively easy to elongate, it conforms to the body, and since the other members (the absorbent layer 20 and the waterproof layer 30) are less stretchable, leakage can be suppressed while maintaining the absorption capacity. The strength of the absorbent layer 20 in the crotch central region CR3 at 10% elongation is higher than the strength of the surface layer 10 in the crotch central region CR3 at 10% elongation, and higher than the strength of the waterproof layer 30 in the crotch central region CR3 at 10% elongation. In a low elongation state, the absorbent layer 20 is less likely to stretch than the surface layer 10 and the waterproof layer 30, so that leakage can be suppressed while maintaining the absorption capacity. 【0058】 The strength of the waterproof layer 30 in the crotch region CR at 50% elongation may be lower than the strength of the surface layer 10 in the crotch region CR at 50% elongation and may be lower than the strength of the absorbent layer 20 in the crotch region CR at 50% elongation. The strength at 50% elongation is the strength at elongation when the crotch region CR is elongated 1.0 to 1.5 times in the front-rear direction L by the following measurement method. In a highly elongated state (a state where it is stretched to 1.5 times), the waterproof layer 30 is more stretchable than the surface layer 10 and the absorbent layer 20, so that even when the shorts are greatly elongated during exercise, the waterproof layer 30 can continue to follow the movement of the body and keep fitting to the body, thereby suppressing leakage of bodily fluids. In addition, in a highly elongated state, the surface layer 10 and the absorbent layer 20 are less stretchable than the waterproof layer 30, so that the body can be covered while maintaining the fitting shape formed in a low elongated state (a state where it is stretched to 1.1 times), and the absorption capacity can be maintained and leakage can be suppressed. Furthermore, the strength of the surface layer 10 in the crotch region CR at 50% elongation may be lower than the strength of the absorbent layer 20 in the crotch region CR at 50% elongation. When the shorts are significantly elongated during exercise, etc., it is more important to achieve both good fit and stable absorption capacity. The surface layer 10 is relatively easy to stretch, so that the surface layer 10 can flexibly fit the movement of the body. Furthermore, the absorbent layer 20 is relatively difficult to stretch, so that the absorption capacity can be stably maintained. 【0059】 The strength of the surface layer 10 in the back crotch region CR2 at 10% elongation may be lower than the strength of the waterproof layer 30 in the back crotch region CR2 at 10% elongation and may be lower than the strength of the absorbent layer 20 in the back crotch region CR2 at 10% elongation. The back crotch region CR2 is an area that is easily deformed by the movement of the buttocks. Since the surface layer 10 is more stretchable than the waterproof layer 30 and the absorbent layer 20, it can follow the movement of the body and maintain a good fit to the buttocks. The absorbent layer 20 and the waterproof layer 30 are relatively difficult to stretch, so they can maintain their shape, continue to cover the body, and suppress leakage. 【0060】 The strength of the exterior body 51 in the crotch region CR at 10% elongation is lower than the strength of the interior body 52 in the crotch region CR at 10% elongation. With this configuration, the exterior body 51 is easy to elongate, and in a low-elongation state at the beginning of wearing, the pressing portion 60 provided on the exterior body 51 presses the absorbent layer 20, fitting the convex portions to concave parts of the body such as the vaginal opening and buttocks, thereby maintaining a leak-resistant structure. 【0061】 Here, the strength at extension can be measured by the following method. A constant-speed extension tensile tester is used to measure the strength at extension. Prepare the sample to be measured. Specifically, cut out five samples of 25 mm wide x 160 mm long in the MD and CD directions. The measurement conditions are tensile speed: 100 mm / min, grip interval: 100 mm, data: maximum strength, maximum elongation strength, and sample, and set the desired strength at each extension as necessary. The sample is clamped correctly in the grip of the tensile tester so that no load is applied to the sample. At this time, the grip interval is 100 mm, and the direction along the grip interval (100 mm direction) is aligned along the 160 mm length of the sample. The sample is also placed so that it is taut. The strength when stretched 10% (1.1 if the initial state is 1.0) is defined as the strength at 10% stretch, and the strength when stretched 50% (1.5 if the initial state is 1.0) is defined as the strength at 50% stretch. The unit is N / 25mm. When measuring the strength at stretch in the crotch region, the gripping interval is adjusted so that positions adjacent to each outer edge in the front and rear direction of the crotch region are gripped, when measuring the strength at stretch in the central crotch region, the gripping interval is adjusted so that positions adjacent to each outer edge in the front and rear direction of the crotch central region are gripped, and when measuring the strength at stretch in the rear crotch region, the gripping interval is adjusted so that positions adjacent to each outer edge in the front and rear direction of the crotch rear region are gripped. 【0062】 The crotch joint 40 may be a sewn part where the surface layer 10 and the absorbent layer 20 are sewn together. The sewn part is a part sewn together by thread or the like. The surface layer 10 and the absorbent layer 20 are in close contact with each other at the sewn part by thread or the like, and the periphery of the sewn part rises in the thickness direction relative to the sewn part. Therefore, the crotch joint 40 made of the sewn part is more likely to become a base point, and the crotch non-joined part 45 between the crotch joints 40 is more likely to form a shape that is raised toward the wearer. In addition, the sewn part has a hole through which the thread passes, which increases the ability to draw bodily fluids from the surface layer 10 to the absorbent layer 20, improving the wearing comfort. The crotch joint 40 of this embodiment is made of a sewn part. 【0063】 In a modified example, the joining portion may be an adhesive portion that joins the non-skin surface of the surface layer 10 and the skin surface of the absorbent layer 20. The adhesive portion includes welding by heat or the like and adhesion by adhesive. The adhesive portion joins the non-skin surface of the surface layer 10 and the skin surface of the absorbent layer 20, and since there is no restriction from the skin surface of the surface layer 10 to the non-skin surface of the absorbent layer 20, the degree of freedom of the skin surface of the surface layer 10 and the non-skin surface of the absorbent layer 20 is high. Therefore, it is easy to follow the movement of the body, and it is easy to obtain the effect of fitting to the body and continuing to cover the body. In addition, the adhesive portion made of adhesive tends to have a large area compared to the sewn portion. Therefore, the area of ​​the joining portion can be secured, the surface layer 10 and the absorbent layer 20 can be joined over a wide range, and twisting and displacement can be suppressed. 【0064】 Next, the configuration of the end joint 49 and the side joint 48 will be described in detail with reference to Fig. 4 and Fig. 5. A surface waterproof layer covering the skin-facing side T1 of the surface layer 10 may be provided in the crotch region CR. The surface waterproof layer may be a part of the member constituting the waterproof layer 30 located on the non-skin-facing side T2 of the absorbent layer 20, or may be a separate member from the member constituting the waterproof layer 30 located on the non-skin-facing side T2 of the absorbent layer 20. In the region where the surface waterproof layer is arranged, the surface layer 10 and the absorbent layer 20 are sandwiched by the waterproof layer 30 in the thickness direction T. The surface waterproof layer can cover the skin-facing side of the surface layer, and the waterproof layer can cover the non-skin-facing side of the surface layer, thereby suppressing leakage of body fluids from the surface layer to the skin-facing side and leakage of body fluids from the surface layer to the non-skin-facing side. 【0065】 The surface waterproof layer may have side surface waterproof layers 31 arranged on both outer sides of the inner body 52, and end surface waterproof layers 32 arranged on the front end and the rear end of the inner body 52. ​​In the present embodiment, the outer parts of the waterproof layer 30 are folded back inward in the width direction W from the first fold FL1 located at the outer edge of the crotch region CR, and cover the skin side T1 of the surface layer 10 and the skin side of the side joint 48. In a modified example, the side surface waterproof layer 31 may be made of a material different from the waterproof layer 30. In the present embodiment, the end surface waterproof layer 32 is made of a material different from the waterproof layer 30, and covers the skin side T1 of the surface layer 10 and the skin side T1 of the end joint 49. In a modified example, the end surface waterproof layer 32 may be a portion where the outer end of the waterproof layer 30 is folded back inward in the front-to-rear direction L from the fold located at the outer edge of the crotch region CR. The side surface waterproof layer 31 wraps around the outer edges of the surface layer 10 and the absorbent layer 20, and the waterproof layer 30 covers the skin side of the surface layer 10 and the non-skin side of the absorbent layer 20, thereby suppressing leakage from the outer edges of the crotch region CR. The side surface waterproof layer 31 and the end surface waterproof layer 32 may be continuous. Thus, the side surface waterproof layer 31 and the end surface waterproof layer 32 are arranged so as to surround the entire outer periphery of the surface layer 10 and the entire outer periphery of the absorbent layer 20, thereby suppressing leakage of bodily fluids from the outer edges of the surface layer 10 and the absorbent layer 20. 【0066】 The surface waterproof layer may have a first waterproof layer 35 constituting the skin side of the shorts, and a second waterproof layer 36 that is continuous with the first waterproof layer 35 through a fold and is located on the non-skin side T2 of the first waterproof layer 35. The second waterproof layer 36 is disposed between the first waterproof layer 35 and the surface layer 10. As shown in FIG. 4, the first waterproof layer 35 of the side surface waterproof layer 31 is a region between the first fold FL1 and the third fold FL3 in the width direction W. The third fold FL3 constitutes the inner edge of the first waterproof layer 35 of the side surface waterproof layer 31 and the inner edge of the second waterproof layer 36 of the side surface waterproof layer 31. The outer edge of the second waterproof layer 36 of the side surface waterproof layer 31 is located inside the first fold FL1 in the width direction W. As shown in FIG. 5, the first waterproof layer 35 of the end surface waterproof layer 32 is a region between the outer end edge of the surface waterproof layer and the fourth fold FL4. The fourth fold FL4 constitutes the inner edge of the first waterproof layer 35 of the end surface waterproof layer 32 and the inner edge of the second waterproof layer 36 of the end surface waterproof layer 32. The outer edge of the second waterproof layer 36 of the end surface waterproof layer 32 is located more inward in the width direction W than the outer edge of the surface waterproof layer. 【0067】 The outer edge joint may have a first outer edge joint 46 that joins both the first waterproof layer 35 and the second waterproof layer 36, and a second outer edge joint that joins only the second waterproof layer 36 of the first waterproof layer 35 and the second waterproof layer 36. The first outer edge joint 46 and the second outer edge joint are seams that sew the surface layer 10, the absorbent layer 20, the first waterproof layer 35, and the second waterproof layer 36. As shown in FIG. 3 and FIG. 5, the first outer edge joint 46 joins the surface layer 10, the absorbent layer 20, the first waterproof layer 35, and the second waterproof layer 36. The first outer edge joint 46 does not join the waterproof layer 30 located on the non-skin-facing side T2 of the absorbent layer 20. The first outer edge joint 46 of this embodiment is provided in the area between the outer edge of the end surface waterproof layer 32 and the fourth fold FL4. The second outer edge joint corresponds to the side joint 48 and the end joint 49. 4, the side joints 48 join the surface layer 10, the absorbent layer 20 and the second waterproof layer 36, but do not join the waterproof layer 30 and the first waterproof layer 35 which are located on the non-skin facing side T2 of the absorbent layer 20. The end joints 49 join the surface layer 10, the absorbent layer 20 and the second waterproof layer 36, but do not join the waterproof layer 30 and the first waterproof layer 35 which are located on the non-skin facing side T2 of the absorbent layer 20. 【0068】 By providing the second outer edge joining portion, holes for threading or the like are not formed, and body fluids once drawn into the absorbent layer 20 are less likely to return to the surface waterproof layer side, thereby suppressing the return of the fluid. On the other hand, the first outer edge joining portion 46 has holes formed therein, which improves the drawability from the surface waterproof layer side to the absorbent layer side and the breathability. By providing both the first outer edge joining portion and the second outer edge joining portion, the drawability of body fluids, the effect of suppressing the return of body fluids, and the breathability can be improved. In addition, since the outer edge joining portion is a sewn portion, the periphery of the outer edge joining portion is likely to rise in the thickness direction relative to the outer edge joining portion. Therefore, the thickness around the outer edge joining portion is increased, and leakage from the outer edge portion of the crotch region can be further suppressed. In addition, in a modified example, the outer edge joining portion may have only the first outer edge joining portion 46 or only the second outer edge joining portion. 【0069】 The first outer edge joining portion 46 may be disposed across the center of the width direction W of the crotch region CR at the front end of the crotch region CR. The first outer edge joining portion 46 is sewn to the first waterproof layer 35 and can be seen from the skin side T1 of the shorts. The front end of the crotch region CR is easily visible when the wearer aligns the shorts when wearing them, and the first outer edge joining portion 46 can be used as a mark for alignment. In particular, when using a pad such as a napkin in combination with the absorbent sanitary shorts, the pad can also be aligned. The first outer edge joining portion of this embodiment is provided on the end surface waterproof layer 32 located at the front end of the crotch region CR, but is not provided on the end surface waterproof layer 32 located at the rear end of the crotch region CR. Moreover, the first outer edge joining portion of this embodiment is not provided on the side surface waterproof layer 31. The side surface waterproof layer 31 is an area that easily adheres to the legs when worn, and can suppress discomfort caused by the stitching portion touching the legs. 【0070】 Although the present invention has been described in detail using the above-mentioned embodiment, it is clear to those skilled in the art that the present invention is not limited to the embodiment described in this specification. The present invention can be implemented in modified and altered forms without departing from the spirit and scope of the present invention defined by the description of the claims. Therefore, the description in this specification is intended to be illustrative and does not have any limiting meaning on the present invention. [Explanation of symbols] 【0071】 1: Water-absorbing sanitary shorts 10: Surface layer 11: Convex part 12: Recess 20: Absorption layer 21 :Low density part 22: High density part 25: Area of ​​attraction 27: Diffusion part 30: Waterproof layer 31: Side surface waterproof layer (surface waterproof layer) 32: Edge surface waterproof layer (surface waterproof layer) 35: 1st waterproof layer 36: 2nd waterproof layer 40: Inseam joint 45: Inseam non-joint area 46: First outer edge joint 48: Side joint (second outer edge joint) 49: End joint (second outer edge joint) 60: Pressing part R10: Water-repellent area CR: Inseam area CR1: Front inseam area CR2: Back inseam area CR3: Center crotch area CRC: Inseam center L: Anteroposterior direction T: Thickness direction T1: Skin side T2: Non-skin side W: Width direction

Claims

[Claim 1] Reusable absorbent sanitary shorts having a surface layer, an absorbent layer positioned on the non-skin side of the surface layer, and a waterproof layer positioned on the non-skin side of the absorbent layer, The surface layer and the absorbent layer mainly consist of non-absorbent fibers. The water repellency of the skin side of the surface layer is higher than that of the non-skin side of the surface layer. The absorbent layer has a pull-in region where the density increases from the skin side to the non-skin side. The aforementioned pull-in region has a diffusion portion containing fibers oriented in a planar direction, in these absorbent sanitary shorts. [Claim 2] The absorbent sanitary shorts according to claim 1, wherein the official moisture content of the non-absorbent fibers of the surface layer is less than 1%. [Claim 3] The absorbent sanitary shorts according to claim 1, wherein the official moisture content of the non-absorbent fibers that make up the main body of the absorbent layer is less than 1%. [Claim 4] The surface of the aforementioned surface layer is provided with a water-repellent region that has a higher degree of water repellency than the non-surface surface of the aforementioned surface layer. The absorbent sanitary shorts according to any one of claims 1 to 3, wherein, in a plan view of the absorbent sanitary shorts, the area of ​​the water-repellent region on the skin surface of the surface layer is 50% or more and 90% or less of the entire skin surface of the surface layer. [Claim 5] The surface layer has a plurality of protrusions that project toward the skin side and recesses arranged between the protrusions, The absorbent sanitary shorts according to claim 4, wherein the water-repellent region is provided on the protruding portion. [Claim 6] The absorbent sanitary shorts according to claim 5, wherein, in a plan view of the shorts, the recesses are spaced apart and surrounded by the protrusions. [Claim 7] The absorbent layer is a knitted fabric in which fibers woven into a substrate extending in the planar direction protrude in the thickness direction. The absorbent sanitary shorts according to any one of claims 1 to 3, wherein the fibers of the absorbent layer are irregularly shaped cross-sectional fibers having a diameter of less than 10 μm. [Claim 8] The aforementioned retraction region has a low-density portion and a high-density portion located on the non-skin side of the low-density portion and having a higher density than the low-density portion. The absorbent sanitary shorts according to any one of claims 1 to 3, wherein the high-density portion is provided in the central region of the region obtained by dividing the absorbent layer into three equal parts in the thickness direction. [Claim 9] The aforementioned retraction region has a low-density portion and a high-density portion located on the non-skin side of the low-density portion and having a higher density than the low-density portion. The absorbent sanitary shorts according to any one of claims 1 to 3, wherein the high-density portion constitutes the diffusion portion. [Claim 10] It has a joint portion that joins the surface layer and the absorption layer, The absorbent sanitary shorts according to any one of claims 1 to 3, wherein the density of the joint is higher than the density of the area surrounding the joint. [Claim 11] The absorbent sanitary shorts according to any one of claims 1 to 3, wherein the density of the entire absorbent layer is lower than the density of the entire surface layer. [Claim 12] The absorbent sanitary shorts have a front-to-back direction and a width direction perpendicular to the front-to-back direction. The absorbent sanitary shorts according to any one of claims 1 to 3, wherein the liquid diffusion properties of the absorbent layer in the front-to-back direction are higher than the liquid diffusion properties of the absorbent layer in the width direction.

Images