Absorbent article

Abstract

Provided is an absorbent article in which the absorption performance of an absorbent core is easily maintained while suppressing liquid residue in a topsheet. An absorbent article (1) is provided with a liquid-permeable top sheet (10), a liquid-impermeable back sheet (20), and an absorbent core (31) disposed between the top sheet and the back sheet. A low-liquid-permeable part (100) is provided on the non-skin side of the top sheet and on the skin side of the non-skin surface of the absorbent core, the low-liquid-permeable part (100) having a lower transfer rate of body fluid from the skin side to the non-skin side than the surroundings. The low liquid permeable portion is disposed in a center region (RC) located in the center in the width direction of a region obtained by dividing the absorbent core into three equal parts in the width direction.

Description

Technical Field

[0001] The present invention relates to absorbent articles. Background Art

[0002] Patent document 1 discloses an absorbent article having a low liquid permeability portion. The low liquid permeability portion of Patent document 1 is provided on a top sheet. The top sheet is formed by applying a waterproofing agent to a spunlace nonwoven fabric composed of 100% by weight of cotton fibers, and a plurality of openings are formed at least in a portion corresponding to the excretion opening in a longitudinally long shape extending from the front to the back of the absorbent article. In the area where the waterproofing agent is applied, the water absorption of the skin contact surface is reduced, and the absorption performance of body fluid is reduced compared to the surrounding area. In addition, by using the openings to guide the body fluid to the non-skin side, liquid residue in the top sheet can be suppressed.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-99558 Summary of the invention

[0006] However, the above-mentioned absorbent article has the following problems.

[0007] Of the body fluids discharged onto the top sheet, the body fluids that are guided to the non-skin side through the openings do not remain on the top sheet, and liquid residue on the top sheet can be suppressed. However, body fluids on the area coated with the waterproofing agent are difficult to be introduced into the top sheet, and body fluids are likely to remain on the top sheet. Therefore, there is a concern that the body fluids remaining on the top sheet may cause skin troubles.

[0008] In addition, the body fluid introduced through the openings of the top sheet is guided to the absorbent core and retained by the absorbent core. The applicant conducted in-depth research and found that the rigidity and thickness of the absorbent core change due to the absorption of body fluid. The absorbent core after absorbing body fluid cannot maintain the rigidity and thickness compared with the absorbent core before absorption, and sometimes cannot maintain the target state after use.

[0009] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an absorbent article which is easy to maintain the absorption performance of the absorbent core while suppressing liquid residue on the top sheet.

[0010] An absorbent article of one embodiment comprises a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent core disposed between the top sheet and the back sheet. A low liquid-permeable portion having a lower transfer rate of body fluid from the skin side to the non-skin side than the surrounding area is provided at a position closer to the non-skin side than the non-skin surface of the top sheet and closer to the skin side than the non-skin surface of the absorbent core. The low liquid-permeable portion is disposed in a central region located in the center of the width direction in a region obtained by dividing the absorbent core into three equal parts in the width direction.

[0011] An absorbent article of another embodiment comprises a liquid-permeable top sheet, a liquid-impermeable bottom sheet, and an absorbent core disposed between the top sheet and the bottom sheet. A low liquid-permeable portion having a lower transfer rate of body fluid from the skin side to the non-skin side than the surrounding area is provided at a position closer to the non-skin side than the non-skin surface of the top sheet and closer to the skin side than the non-skin surface of the absorbent core. The low liquid-permeable portion is provided in the absorbent core. The absorption amount per unit area of ​​the portion of the absorbent core where the low liquid-permeable portion is provided is lower than the absorption amount per unit area of ​​the portion of the absorbent core around the low liquid-permeable portion. The rigidity of the region where the low liquid-permeable portion is provided is higher than the rigidity of the region around the low liquid-permeable portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a plan view of the absorbent article according to the embodiment as viewed from the skin side.

[0013] Figure 2 This is a plan view of the absorbent article according to the embodiment as viewed from the non-skin side.

[0014] Figure 3 It is along Figure 1 A cross-sectional view along line AA is shown.

[0015] Figure 4 It is along Figure 1 A cross-sectional view along line BB is shown.

[0016] Figure 5 It is a figure which shows the absorbent article of a modification example. DETAILED DESCRIPTION

[0017] (1) Overview of Implementation

[0018] At least the following matters will become clear through the description of this specification and the accompanying drawings.

[0019] The invention of scheme 1 is an absorbent article having a liquid-permeable top sheet, a liquid-impermeable bottom sheet, and an absorbent core disposed between the top sheet and the bottom sheet. A low liquid-permeable portion having a lower transfer speed of body fluid from the skin side to the non-skin side than the surrounding area is provided at a position closer to the non-skin side than the non-skin side of the top sheet and closer to the skin side than the non-skin side of the absorbent core. The low liquid-permeable portion is disposed in a central area located in the center of the width direction in an area obtained by dividing the absorbent core into three equal parts in the width direction. The transfer speed of body fluid to the non-skin side in the low liquid-permeable portion is lower than that of the surrounding area, and body fluid is not easily transferred in the low liquid-permeable portion compared to the surrounding area. The low liquid-permeable portion is located at a position closer to the skin side than the non-skin side of the absorbent core. In the portion of the absorbent core located closer to the non-skin side than the low liquid-permeable portion, body fluid is not easily guided, and the amount of body fluid absorbed is small. In general, the rigidity and thickness of the absorbent core change due to the absorption of body fluid. The absorbent core after absorbing body fluid cannot maintain the rigidity and thickness compared to the absorbent core before absorption, and sometimes cannot maintain the target state until after use. However, by providing a low liquid-permeable portion, a portion that can suppress changes in the absorbent core before and after absorbing body fluid can be provided in the absorbent core. In the central area of ​​the absorbent core, body fluid is easily discharged, and the changes caused by the absorption of body fluid are large. By providing the low liquid-permeable portion in the central area, it is easy to maintain the state before use even after use. In addition, the introduction of body fluid can be ensured in the top sheet or the like arranged at a position closer to the skin side than the low liquid-permeable portion, thereby suppressing liquid residue on the surface of the absorbent article. In this way, skin troubles caused by body fluid residue on the surface of the absorbent article can be suppressed.

[0020] The invention of Scheme 2 may have the following features on the basis of the invention of Scheme 1. The rigidity of the region where the low liquid-permeable portion is provided is higher than the rigidity of the region around the low liquid-permeable portion. Since the rigidity of the region where the low liquid-permeable portion is provided is higher than the surrounding region, the deformation due to the pressure from the body during wearing is reduced, and the state before wearing is more easily maintained. In addition, the low liquid-permeable portion is located at a position closer to the non-skin side than the top sheet, and is not easy to directly contact the skin of the wearer. Since the rigidity of the top sheet is lower than that of the low liquid-permeable portion, even if the rigidity of the low liquid-permeable portion itself increases, the wearer will not easily feel the increased rigidity due to the softness of the top sheet, and discomfort during wearing can be suppressed.

[0021] The invention of scheme 3 is an absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent core disposed between the top sheet and the back sheet. A low liquid-permeable portion having a lower transfer rate of body fluid from the skin side to the non-skin side than the surrounding is provided at a position closer to the non-skin side than the non-skin side of the top sheet and closer to the skin side than the non-skin side of the absorbent core. The low liquid-permeable portion is provided in the absorbent core. The absorption amount per unit area of ​​the portion of the absorbent core provided with the low liquid-permeable portion is lower than the absorption amount per unit area of ​​the portion of the absorbent core located around the low liquid-permeable portion. The rigidity of the region provided with the low liquid-permeable portion is higher than the rigidity of the region around the low liquid-permeable portion. Since the absorption amount per unit area of ​​the region provided with the low liquid-permeable portion is low, by providing the low liquid-permeable portion, a portion capable of suppressing the change of the absorbent core before and after absorbing body fluid can be provided in the absorbent core. In addition, since the rigidity of the region provided with the low liquid-permeable portion is higher than the surrounding, the deformation due to the pressure from the body is reduced when worn, and it is easier to maintain the state before wearing. In addition, the low liquid-permeable portion is located closer to the non-skin side than the top sheet, and is less likely to come into direct contact with the wearer's skin. Therefore, even if the rigidity of the low liquid-permeable portion itself increases, the rigidity of the top sheet is lower than that of the low liquid-permeable portion, and the wearer is less likely to feel the increased rigidity due to the softness of the top sheet, thereby suppressing discomfort during wear.

[0022] According to a preferred embodiment, the invention of embodiment 4 may have the following features in addition to any one of the inventions of embodiments 1 to 3. The low liquid-permeable portion is composed of a liquid-impermeable sheet disposed at a position closer to the skin side than the absorbent core. According to this embodiment, the liquid-impermeable sheet can be used to suppress the absorption of body fluids from the skin side, thereby ensuring the rigidity of the region of the absorbent core that overlaps with the sheet.

[0023] According to a preferred embodiment, the invention of embodiment 5 may have the following features in addition to any one of the inventions of embodiments 1 to 3. The low liquid-permeable portion is composed of a hydrophobic coating agent applied to at least one of the absorbent core, the top sheet, and a sheet disposed between the absorbent core and the top sheet. According to this embodiment, the hydrophobic coating agent can be used to suppress the absorption of body fluids from the skin side, thereby ensuring the rigidity of the region of the absorbent core that overlaps with the coating agent.

[0024] According to a preferred embodiment, the invention of embodiment 6 may have the following features in addition to the invention of any one of embodiments 1 to 3. The low liquid-permeable portion is composed of a compressed portion formed by compressing at least the absorbent core in the thickness direction. According to this embodiment, the low liquid-permeable portion composed of the compressed portion has high rigidity, and the rigidity of the absorbent core can be ensured.

[0025] According to a preferred embodiment, the invention of embodiment 7 may have the following features in addition to the invention of any one of embodiments 1 to 3. The low liquid-permeable portion is provided between the top sheet and the absorbent core. According to this embodiment, it is possible to suppress the absorption of body fluid in at least the region of the absorbent core overlapping with the low liquid-permeable portion, and since the low liquid-permeable portion and the absorbent core are provided separately, it is easy to ensure the absorption performance of the absorbent core.

[0026] According to a preferred embodiment, the invention of embodiment 8 may have the following features in addition to the invention of any one of embodiments 1 to 3. The low liquid-permeable portion is provided in the absorbent core. According to this embodiment, due to the presence of the low liquid-permeable portion, it is difficult to be absorbed by the absorbent core, and the rigidity of the absorbent core can be maintained.

[0027] According to a preferred embodiment, the invention of embodiment 9 may have the following features based on any one of the inventions of embodiments 1 to 3. The absorbent article has a second sheet disposed between the top sheet and the absorbent core. The low liquid-permeable portion is disposed between the top sheet and the second sheet. According to this embodiment, the low liquid-permeable portion can be disposed at a position separated from the absorbent core, which can reduce the possibility of the absorbent core absorbing body fluids, thereby further reducing the change in the rigidity of the absorbent core before and after absorbing body fluids.

[0028] According to a preferred embodiment, the invention of embodiment 10 may have the following features on the basis of any one of the inventions of embodiments 1 to 9. The low liquid-permeable portion spans the center of the width direction of the absorbent core. The center of the width direction of the absorbent core is a portion where forces tend to concentrate when the absorbent core is held between legs. In addition, the center of the width direction of the absorbent core is an area where body fluids tend to be discharged. By providing the low liquid-permeable portion across the center of the width direction of the absorbent core, deformation with respect to forces can be suppressed, and changes in rigidity and the like caused by the absorption of body fluids can be suppressed.

[0029] According to a preferred embodiment, the invention of embodiment 11 may have the following features in addition to any one of the inventions of embodiments 1 to 10. The low liquid-permeable portion extends in the front-to-back direction. According to this embodiment, the low liquid-permeable portion can be used to diffuse the body fluid in the front-to-back direction, and the body fluid can be absorbed in a larger area in the front-to-back direction. By expanding the absorption range of the body fluid, it is easy to suppress the formation of a region where a large amount of body fluid is retained locally, and it is easy to maintain the rigidity of the absorbent core.

[0030] According to a preferred embodiment, the invention of embodiment 12 may have the following features in addition to the invention of embodiment 11. A plurality of low liquid-permeable portions are provided at intervals in the width direction. According to this embodiment, the low liquid-permeable portions are arranged at intervals in the width direction, and there is an area where no low liquid-permeable portion is arranged between the low liquid-permeable portions. Even when the low liquid-permeable portion located on the outside in the width direction is deformed due to a force applied to the inside in the width direction by the legs or the like, the low liquid-permeable portion located on the inside in the width direction will not be deformed and can exert its performance, and the performance of the low liquid-permeable portion can be maintained by using one of the low liquid-permeable portions.

[0031] According to a preferred embodiment, the invention of embodiment 13 may have the following features on the basis of any one of the inventions of embodiments 1 to 10. The low liquid permeability portion extends in the width direction and is arranged in a plurality at intervals in the front-to-back direction. According to this embodiment, the low liquid permeability portion is arranged at intervals in the front-to-back direction, and there is an area where the low liquid permeability portion is not arranged between the low liquid permeability portions. Even if the absorbent article is arranged along the roundness of the body from the front to the back of the body, the low liquid permeability portion will not be deformed and can exert its performance, and the performance of the low liquid permeability portion can be maintained by using a certain low liquid permeability portion. In addition, while introducing body fluid to the non-skin side in the area between the low liquid permeability portions, the body fluid can be diffused in the width direction by using the low liquid permeability portion, and the body fluid can be absorbed in a larger area in the width direction. In addition, in a mode in which the rigidity of the low liquid permeability portion is high, the low liquid permeability portion can be used to oppose the force from the legs, thereby suppressing excessive deformation of the absorbent core.

[0032] According to a preferred embodiment, the invention of embodiment 14 may have the following features on the basis of any one of the inventions of embodiments 1 to 13. The length of the low liquid-permeable portion in the width direction is 50% or less relative to the length of the absorbent core in the width direction. According to this embodiment, since the length of the low liquid-permeable portion in the width direction is 50% or less relative to the entire width direction of the absorbent core, the low liquid-permeable portion is not easily in contact with the feet of the wearer, etc., and can avoid direct force, so it is easier to maintain the shape of the low liquid-permeable portion. In addition, if the length of the low liquid-permeable portion in the width direction is too long, there is a concern that the ratio of the low liquid-permeable portion increases, the introduction of body fluid into the absorbent core decreases, and leakage such as flow leakage occurs. However, since the length of the low liquid-permeable portion in the width direction is 50% or less relative to the entire width direction of the absorbent core, the introduction of body fluid in other areas can be ensured, thereby suppressing leakage.

[0033] According to a preferred embodiment, the invention of embodiment 15 may have the following features in addition to any one of the inventions of embodiments 1 to 14. The low liquid-permeable portion is provided in an excretion-opposing region that is arranged opposite to the excretion opening of the wearer. The excretion-opposing region is the portion that is most likely to guide and absorb body fluids. By providing the low liquid-permeable portion in the excretion-opposing region, the rigidity of the portion that is most likely to be deformed by absorbing body fluids can be maintained close to the state before use, and distortion during wear can be effectively suppressed.

[0034] According to a preferred embodiment, the invention of embodiment 16 may have the following features in addition to any one of the inventions of embodiments 1 to 14. The low liquid-permeable portion is provided so as not to cross the center in the front-back direction. Since the low liquid-permeable portion is provided so as not to cross the center in the front-back direction of the absorbent article, the body fluid can be absorbed in the center in the front-back direction of the absorbent article where more body fluid is discharged, and discomfort caused by a decrease in the liquid introduction property can be suppressed. In addition, in an embodiment in which the low liquid-permeable portion is located at a position forward of the center in the front-back direction of the absorbent core, the user can easily notice the presence of the low liquid-permeable portion during the installation operation and when wearing the absorbent article.

[0035] According to a preferred embodiment, the invention of embodiment 17 may have the following features based on any one of the inventions of embodiments 1 to 16. An inspection member for inspecting the health status of the wearer is arranged in an area overlapping the low liquid permeable portion on the non-skin side of the low liquid permeable portion. According to this embodiment, by arranging the inspection member in the area overlapping the low liquid permeable portion, it is possible to avoid excessive body fluid from contacting the inspection member, thereby suppressing erroneous reactions. In addition, since the low liquid permeable portion is a structure that is not easily twisted, it is possible to avoid excessive pressure being applied to the inspection member, and it is possible to avoid folds and wrinkles in the inspection member.

[0036] (2) Absorbent article according to the embodiment

[0037] Hereinafter, an absorbent article 1 of an embodiment will be described with reference to the accompanying drawings. In addition, in the description of the following drawings, the same or similar reference numerals are marked for the same or similar parts. However, it should be noted that the drawings are schematic, and the ratios of the various dimensions are different from the actual situation. Therefore, the specific dimensions should be determined by referring to the following description. In addition, the drawings may also contain parts with different relationship and ratio of each other's dimensions. The absorbent article 1 may be an absorbent article such as a sanitary napkin, a panty liner, an incontinence pad, a fecal pad, a disposable diaper, a panty-type sanitary napkin, etc. The absorbent article 1 may be an article used by attaching to a wearing article such as underwear, or an absorbent article used without attaching to a wearing article. The absorbent article 1 of the embodiment is a panty liner. In addition, in the description of the following drawings, the same or similar reference numerals are marked for the same or similar parts. However, it should be noted that the drawings are schematic, and there are cases where the ratios of the various dimensions are different from the actual situation. Therefore, the specific dimensions should be determined by referring to the following description. In addition, the drawings may also contain parts with different relationship and ratio of each other's dimensions. In addition, in the cross-sectional view, each component is shown separately for convenience of explanation, but in an actual product, each component is in contact with each other.

[0038] Figure 1 This is a plan view of the absorbent article 1 as viewed from the skin side T1. Figure 2 This is a plan view of the absorbent article 1 as viewed from the non-skin side T2. Figure 3 It is along Figure 1 A cross-sectional view along line AA is shown. Figure 4 It is along Figure 1 The sectional view along the BB line shown in FIG. Here, the "skin side" corresponds to the side facing the skin of the wearer during use. The "non-skin side" corresponds to the side facing the skin of the wearer during use. The absorbent article 1 has a front-to-back direction L, a width direction W, and a thickness direction T that are orthogonal to each other. The side of the absorbent article 1 in the front-to-back direction L that contacts the lower abdomen of the user is called the "front side", and the side that contacts the buttocks of the user is called the "rear side".

[0039] The absorbent article 1 has a front region S1, a rear region S2, and a crotch region S3. The crotch region S3 includes an excretion opening relative region S5 arranged opposite to the excretion opening of the wearer, such as the vaginal opening. The crotch region S3 is an area arranged in the crotch of the wearing article and arranged between the legs of the wearer when the absorbent article 1 is mounted on the wearing article. The front region S1 is located at a position closer to the front side than the crotch region S3. The front end edge of the front region S1 defines the front end edge of the absorbent article 1. The rear region S2 is located at a position closer to the rear than the crotch region S3. The rear end edge of the rear region S2 defines the rear end edge of the absorbent article 1. The crotch region S3 includes an excretion opening relative region S5 abutting against the excretion opening of the wearer. The crotch region S3 may be an area where a wing is provided in an absorbent article having a wing, and may be an area where a narrowing portion is provided in a mode in which the absorbent core has a narrowing portion narrowed inwardly in the width direction. Alternatively, the crotch region S3 may be a region located in the center of the region obtained by dividing the absorbent article into three equal parts in the front-back direction L. The excretion opening facing region S5 is a region facing the vaginal opening or the urinary opening as the excretion opening, and straddles the center of the width direction W of the absorbent core 31. The excretion opening facing region S5 may not be arranged facing the excretion opening of the wearer who actually wears the article, but may be an area arranged facing the excretion opening of the wearer in design.

[0040] In addition, the outer side portion in the present invention refers to a portion that occupies a certain range in the width direction W, including the outer side edge in the width direction W, and the outer side edge refers to the outer side edge in the width direction W. In addition, the outer side edge of a component that occupies a certain range in the front-to-back direction is an edge obtained by connecting the points located on the outside of the component in the width direction in the entire range of the component. The inner side portion in the present invention refers to a portion that occupies a certain range in the width direction W, including the inner side edge in the width direction W, and the inner side edge refers to the inner side edge in the width direction W. In addition, the inner side edge of a component that occupies a certain range in the front-to-back direction is an edge obtained by connecting the points located on the inside of the component in the width direction in the entire range of the component. In addition, the front end and the rear end in the present invention are portions that occupy a certain range in the front-to-back direction L, including the edges in the front-to-back direction L, and the front end edge and the rear end edge are edges in the front-to-back 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. In addition, the inner side edge is an edge that includes the inner side edge and extends along the front-to-back direction L. The outer side edge is an edge that includes the outer side edge and extends along the front-to-back direction L. In addition, in this specification, the term "along the front-rear direction L" means a direction having an angle smaller than 45° relative to the front-rear direction L, and the term "along the width direction W" means a direction having an angle smaller than 45° relative to the width direction W.

[0041] The absorbent article 1 has at least an absorbent core 31, a top sheet 10 and a back sheet 20. The absorbent article 1 is in a longitudinal shape. The top sheet 10 is a liquid-permeable sheet. The top sheet 10 may be a structure in which the skin surface of the absorbent article 1 is entirely covered with a sheet as in the present embodiment, or may have a central sheet covering the center of the absorbent core 31 in the width direction W and side sheets arranged at a position outside the central sheet in the width direction W. The top sheet 10 is composed of any sheet material having a structure that allows liquid to pass through, such as nonwoven fabric, fabric, perforated plastic sheet, mesh sheet, etc.

[0042] The back sheet 20 is arranged at a position closer to the non-skin side T2 than the absorbent core 31, and is a liquid-impermeable sheet. The back sheet 20 is a liquid-impermeable sheet. The back sheet 20 can be made of a polyethylene sheet, a laminated nonwoven fabric mainly composed of polypropylene, etc., a breathable resin film, a sheet formed by bonding a breathable resin film to a nonwoven fabric such as a spunbond nonwoven fabric or a spunlace nonwoven fabric, etc.

[0043] The absorbent core 31 constitutes the absorber. The absorbent core 31 can be composed of an absorbent material that absorbs liquid. The absorbent material constituting the absorbent core 31 can be formed of, for example, hydrophilic fibers, pulp, and super absorbent polymers (SAP). The absorber may have a core wrap sheet covering the absorbent core 31, or may not have a core wrap sheet as in the present embodiment. The absorbent core 31 has an area obtained by dividing the absorbent core 31 into three equal parts in the width direction W. The area obtained by dividing into three equal parts may include a central area RC located in the center of the width direction W and a side area RS arranged at a position closer to the outside of the width direction W than the central area RC.

[0044] like Figure 2 As shown in the figures, the absorbent article 1 may have an adhesive portion 60 for fixing the absorbent article 1 to a wearing article such as underwear. The adhesive portion 60 is an area provided on the non-skin side T2 of the backsheet 20 and provided with a fixing means for fixing the absorbent article 1 to the wearing article. The adhesive portion 60 may extend in the width direction W and may be provided in plurality at intervals in the front-back direction L. In addition, in a modified example, the adhesive portion 60 may extend in the front-back direction L and may be provided in plurality at intervals in the width direction W.

[0045] The absorbent article 1 of the present embodiment is configured to be easy to maintain the absorption performance of the absorbent core 31 while suppressing the liquid residue of the top sheet 10. The structure for maintaining the absorption performance of the absorbent core 31 while suppressing the liquid residue of the top sheet 10 can be roughly cited as the first mode and the second mode. The absorbent article 1 of the first mode and the second mode all have a low liquid-permeable portion 100. The low liquid-permeable portion 100 is a portion where the transfer speed of body fluid from the skin side T1 to the non-skin side T2 is lower than the surrounding area at a position closer to the non-skin side T2 than the non-skin surface of the top sheet 10 and closer to the skin side T1 than the non-skin surface of the absorbent core 31. The low liquid-permeable portion 100 is a portion where the transfer speed of body fluid from the skin side T1 to the non-skin side T2 is lower than the surrounding area (the area adjacent in the width direction W and the area adjacent in the front-back direction L) when viewed from above.

[0046] Here, the low liquid permeable part 100 can be roughly divided into a structure that reduces the absorption rate of body fluid by lowering the inlet property of body fluid, and a structure that reduces the absorption rate of body fluid by making the introduced body fluid less likely to transfer to the non-skin side T2. Therefore, the determination of the low liquid permeable part 100 can be exemplified by the following first determination method and second determination method, for example. The first determination method is a method for determining the low liquid permeable part 100 with lower inlet property of body fluid. The low liquid permeable part 100 is arranged between the non-skin surface of the top sheet 10 and the non-skin surface of the absorbent core 31. Therefore, when determining the low liquid permeable part 100, first, the top sheet 10 is removed from the absorbent article 1, and the component (in this embodiment, the back sheet 20) at a position closer to the non-skin side T2 than the non-skin surface of the absorbent core 31 is removed. The component between the non-skin surface of the top sheet 10 and the non-skin surface of the absorbent core 31 (hereinafter referred to as the object component) is taken out, and the object component is decomposed into each component as much as possible. For example, as a component, an absorbent core 31, a core wrap sheet, a second sheet, a sheet material other than these (such as a resin film), an adhesive, and a waterproofing agent can be exemplified. When the components are joined, they are decomposed by cooling or heating to release the joining state of the adhesive, etc. In addition, the material coated with an adhesive, a waterproofing agent, etc. cannot be taken out separately, so it is set to be a state of any component. The components taken out from the object member are placed on a flat surface respectively, and a drop of simulated body fluid is dripped on the surface of the skin side T1 of each component. When the simulated body fluid remains on the component in the form of beads for more than 60 seconds, the component is not easy to introduce the body fluid, so it is judged that the component is a low liquid permeability portion 100. On the other hand, when the simulated body fluid is introduced into the component in a time shorter than 60 seconds, and when the simulated body fluid remains on the component for more than 60 seconds but the bead shape is distorted in a time shorter than 60 seconds, it is judged that the component is not a low liquid permeability portion 100.

[0047] The second determination method determines the low liquid permeability portion 100 that makes it difficult for the introduced body fluid to transfer to the non-skin side T2. First, the object member is taken out in the same manner as the first determination method. The second determination method is different from the first determination method in that the object member is not decomposed into each component, but is determined based on the state of the object member. Whether it is difficult to transfer to the non-skin side T2 is whether the speed is lower than the surrounding, so the object member is divided into areas. Use ink (such as oily ink) that is not permeable to body fluids to draw lines on the non-skin surface of the object member, dividing it into 50mm×50mm areas. Next, the object member is configured in a floating state in a manner that the non-skin surface of the object member can be visually recognized. Specifically, a plurality of rope-like members (such as a plurality of resin-made wires) that do not introduce body fluids are arranged at intervals, and the object member is placed on the rope-like member. While the object member is placed on the rope-like member, 5ml of simulated body fluid is dripped onto the surface of the skin side T1 of the member. Observe from the non-skin side T2 of the object member. When the arrival time of the body fluid in any partition is slower than that of the surrounding partitions, it is determined that the low liquid permeable portion 100 is provided in the partition because the arrival speed is slower than that of the surrounding partitions. Although it can be determined that the low liquid permeable portion 100 is provided in the partition with a longer time as long as there is a difference in the arrival time when comparing the partitions, it is preferably determined that the low liquid permeable portion 100 is provided in the partition with a longer time when the arrival time of the first partition and the arrival time of the second partition are compared. When the difference between the longer time and the shorter time is 5 seconds or more when the arrival time of the first partition and the arrival time of the second partition are compared, it is determined that the low liquid permeable portion 100 is provided in the partition with a longer time. In addition, when it is difficult to confirm whether the simulated body fluid has reached the non-skin side T2 using 5 ml of simulated body fluid, 5 ml of simulated body fluid is additionally dropped 60 seconds after dropping. In addition, when it is difficult to visually recognize the permeation state of the body fluid in the state of the object member, it can be observed in a state where the bottom film is removed.

[0048] Here, artificial menstrual blood can be used as the simulated body fluid. Artificial menstrual blood can be obtained by mixing appropriate amounts of ionized water, glycerol, sodium carboxymethylcellulose, sodium chloride, sodium bicarbonate, pigment red 102, pigment red 2, and pigment yellow 5 (each pigment is manufactured by Marubeni Shokai Co., Ltd.). In addition, the viscosity of the simulated body fluid can be about 22mPa·s to 26mPa·s. The viscosity can be measured using a viscosity meter (Vismetron model VGA-4 manufactured by Shibaura Systems Co., Ltd.).

[0049] like Figure 3 and Figure 4As shown, in the absorbent article 1 of the present embodiment, a top sheet 10, an HMA (hot melt) adhesive 71, a resin film 50, an HMA adhesive 71, an absorbent core 31, an HMA adhesive 71, a back sheet 20, and an adhesive portion 60 are arranged from the skin side T1 toward the non-skin side T2. Thus, although it depends on the arrangement state of the HMA adhesive that abuts against the top sheet 10 and the back sheet 20 when disassembled, the object member has at least the resin film 50, the HMA adhesive 71, and the absorbent core 31. By implementing the second determination method in the state of the object member, the arrival speed of the partition where the resin film 50 is arranged is slow, and it can be determined that the low liquid permeability portion 100 is provided in the area where the resin film 50 is arranged. Alternatively, by implementing the first determination method, the body fluid introduction property of the resin film 50 is low, and it can be determined that the resin film 50 constitutes the low liquid permeability portion 100.

[0050] The first mode is characterized in that the low liquid permeability portion 100 is arranged in the central area RC. The transfer speed of the body fluid of the low liquid permeability portion 100 to the non-skin side T2 is lower than that of the surrounding area, and the body fluid is not easily transferred in the low liquid permeability portion 100 compared with the surrounding area. The low liquid permeability portion 100 is located at a position closer to the skin side T1 than the non-skin surface of the absorbent core 31. In the portion of the absorbent core 31 that is located closer to the non-skin side T2 than the low liquid permeability portion 100, the body fluid is not easily guided, and the amount of body fluid absorbed is small. In addition, when the low liquid permeability portion 100 is arranged on the non-skin surface of the absorbent core, the absorption of body fluid can be suppressed within a certain range from the non-skin surface of the absorbent core 31 toward the skin side T1. Under normal circumstances, the rigidity and thickness of the absorbent core 31 will change due to the absorption of body fluid. The absorbent core 31 after absorbing body fluid cannot maintain rigidity and thickness compared with the absorbent core 31 before absorption, and sometimes it is impossible to maintain the target state after use. However, by providing the low liquid permeable portion 100, a portion that can suppress the change of the absorbent core 31 before and after absorbing body fluid can be provided in the absorbent core 31. The body fluid is easily discharged from the central region RC of the absorbent core 31 compared with the side region RS, and the change caused by the absorption of body fluid is large. By providing the low liquid permeable portion 100 in the central region RC, it is easy to maintain the state before use even after use. In addition, the introduction of body fluid can be ensured in the top sheet 10 and the like arranged at a position closer to the skin side T1 than the low liquid permeable portion 100, and liquid residue on the surface of the absorbent article 1 can be suppressed. Thus, skin troubles caused by body fluid remaining on the surface of the absorbent article 1 can be suppressed. The absorbent article 1 of this embodiment has the structure of the first mode, and the resin film 50 constituting the low liquid permeable portion 100 is provided in the central region RC. In addition, in the first mode, the low liquid permeable portion 100 only needs to be provided in at least a part of the central region RC, and can be provided in a part of the width direction W of the central region RC, or can be provided in the entire area of ​​the width direction W of the central region RC. In addition, the low liquid-permeable portion 100 may be provided in both the central region RC and the side regions RS.

[0051] The second aspect is characterized in that: the low liquid-permeable portion 100 is provided in the absorbent core 31; the absorption amount per unit area of ​​the region provided with the low liquid-permeable portion 100 is lower than the absorption amount per unit area of ​​the region around the low liquid-permeable portion 100; and the rigidity of the region provided with the low liquid-permeable portion 100 is higher than the rigidity of the region around the low liquid-permeable portion 100. Since the absorption amount per unit area of ​​the region provided with the low liquid-permeable portion 100 is low, by providing the low liquid-permeable portion 100, a portion that can suppress the change of the absorbent core 31 before and after absorbing body fluid can be provided in the absorbent core 31. In addition, since the region provided with the low liquid-permeable portion 100 is higher than the surrounding area, the deformation due to the pressure from the body is reduced when worn, and the state before wearing is more easily maintained. In addition, the low liquid-permeable portion 100 is located at a position closer to the non-skin side T2 than the top sheet 10, and is not easy to directly contact the wearer's skin. Since the rigidity of the top sheet 10 is lower than that of the low liquid-permeable portion 100, even if the rigidity of the low liquid-permeable portion 100 itself increases, the wearer will not easily feel the increased rigidity due to the softness of the top sheet 10, thereby suppressing discomfort and skin trouble during wear.

[0052] Here, the absorption capacity per unit area can be measured using the following method. First, take out the absorbent core 31, divide it into 10mm×10mm areas, cut it according to each partition, and make a test piece. Measure the weight of each test piece and the size when viewed from above. Immerse each test piece in a simulated body fluid as a whole. The simulated body fluid can use the same substance as mentioned above. After 60 seconds, take out each test piece and let it stand on a metal mesh for 1 minute. Then measure the weight of the test piece. This method is used to determine the absorption per unit area. In addition, in the case where the unit area weight of the absorbent fiber of the test piece is uneven, the absorption ratio that can be calculated by (weight after absorption-weight before absorption) / (weight before absorption) can also be used as the absorption amount for comparison.

[0053] In addition, the stiffness may be the Gurley stiffness, which can be measured, for example, by the following method. The instrument used is a Gurley type softness tester manufactured by Yasuda Seiki Co., Ltd. The procedure is to cut the object to be measured into 25 mm × 38 mm and sample according to N = 5. In addition, the sample is cut using a portion without wrinkles using scissors. Next, the sample is placed on the instrument in such a way that the upper end of the sample is located at the upper end of the chuck. In this case, a pendulum is hung at the lower end of the sample. An auxiliary weight is installed in such a way that the scale becomes between 3 and 6. Press the switch to read the scale at the moment when the rotating rod of the pendulum leaves the sample. Measure the left and right sides of the device. Measure three specimens. As a calculation method, the average values ​​of the left and right are obtained for the longitudinal and lateral directions respectively. In this embodiment, the following formula is used for calculation. In addition. For the position of the part where the weight is added, the 1st inch is i, the 2nd inch is ii, and the 4th inch is iii.

[0054] [Formula 1]

[0055]

[0056] As a specific structure of the second embodiment, the following structure can be exemplified: a low-weight portion (including slits) is formed in the absorbent core 31, and other components (resin films) are arranged in the region overlapping with the low-weight portion, or a high-rigidity portion based on embossing or the like is formed in the component in the region overlapping with the low-weight portion. The low-weight portion and other components, or the low-weight portion and the high-rigidity portion constitute the low-liquid-permeable portion 100. Thus, the low-liquid-permeable portion 100 of the absorbent article of the second embodiment only needs to be at least partially provided in the absorbent core 31, and may also have a portion that is not provided in the absorbent core 31. Alternatively, a structure in which a waterproof agent (such as silicon) is impregnated in the absorbent core 31 can be exemplified. According to this structure, the rigidity of the impregnated region can be increased and the water absorption amount can be reduced.

[0057] Next, the structure that can be preferably adopted in the first embodiment and the second embodiment will be described. In addition, unless otherwise specified, the structure described below can also be applied to the first embodiment and the second embodiment. In addition, the structure and position of the low liquid-permeable portion 100 can be appropriately changed. Figure 5 ] An absorbent article according to a modified example is shown in . In addition, the absorbent article according to the modified example may be a modified example applicable to both the first embodiment and the second embodiment.

[0058] In the absorbent article of the first embodiment, similarly to the absorbent article of the second embodiment, the rigidity of the region where the low liquid-permeable portion 100 is provided may be higher than the rigidity of the region around the low liquid-permeable portion 100. According to this embodiment, deformation due to pressure from the body during wearing is reduced, and the state before wearing is easier to maintain. In addition, the wearer is less likely to feel the portion with increased rigidity due to the softness of the top sheet 10, and discomfort during wearing can be suppressed. In addition, in the absorbent article of the second embodiment, similarly to the absorbent article of the first embodiment, the low liquid-permeable portion 100 may be arranged in the central region RC. By providing the low liquid-permeable portion 100 in the central region RC, it is easier to maintain the state before use even after use.

[0059] like Figure 1 As shown, the low liquid-permeable portion 100 may span the center 1CW in the width direction W of the absorbent core 31. The center in the width direction W of the absorbent core 31 is a portion where force is easily concentrated when the absorbent core 31 is clamped by the legs. In addition, the center in the width direction W of the absorbent core 31 is an area where body fluids are easily discharged. By providing the low liquid-permeable portion 100 across the center in the width direction W of the absorbent core 31, deformation with respect to force can be suppressed, and changes in rigidity and the like caused by the absorption of body fluids can be suppressed. In addition, in a method in which a plurality of low liquid-permeable portions 100 are provided, only one of the low liquid-permeable portions 100 needs to span the center 1CW in the width direction W of the absorbent core 31. In addition, as Figure 5 As shown in (A), in a modified example, the low liquid-permeable portion 100 may not be provided across the center 1CW in the width direction W of the absorbent core 31. The body fluid can be absorbed at the center in the width direction W where the body fluid of the absorbent article 1 is discharged more, and discomfort caused by a decrease in the liquid introduction property can be suppressed.

[0060] like Figure 1 As shown in FIG. 1 , the low liquid-permeable portion 100 may extend in the front-to-back direction L. That is, the low liquid-permeable portion 100 may be longitudinally long. The low liquid-permeable portion 100 can be used to spread the body fluid in the front-to-back direction L, and the body fluid can be absorbed in a larger area in the front-to-back direction L. By expanding the absorption range of the body fluid, it is easy to suppress the situation where a large area of ​​body fluid is retained locally, and it is easier to maintain the rigidity of the absorbent core 31 even after absorbing the body fluid. In addition, as Figure 5As shown in (A) of the absorbent article 1A, a plurality of low liquid permeable portions 100 may extend in the front-to-back direction L and be provided at intervals in the width direction W. According to this structure, the low liquid permeable portions 100 are arranged at intervals in the width direction W, and there are areas where the low liquid permeable portions 100 are not arranged between the low liquid permeable portions 100. Even when the low liquid permeable portions 100 located on the outside of the width direction W are deformed due to a force directed inward in the width direction W by the legs or the like, the low liquid permeable portions 100 located on the inside of the width direction W will not be deformed and can exert their performance, and the performance of the low liquid permeable portions 100 can be maintained by using one of the low liquid permeable portions 100. In addition, body fluid can be introduced to the non-skin side T2 in the area between the low liquid permeable portions 100, and the body fluid can be diffused in the front-to-back direction L by using the low liquid permeable portions 100 and absorbed in a larger area in the front-to-back direction L. As shown Figure 5 As shown in (B), the low liquid-permeable portion 100 of the absorbent article 1B may be continuously provided over the entire region in the front-to-back direction L of the absorbent core 31. According to this structure, the region capable of maintaining the state of the absorbent core 31 before use can be continuously provided over the entire region in the front-to-back direction L of the absorbent core 31.

[0061] The low liquid-permeable portion 100 of this embodiment is not provided in the entire region of the absorbent core 31, but is provided in a certain range from the center 1CL in the front-back direction L of the absorbent article 1. Figure 4 As shown, the front edge 100F of the low liquid-permeable portion 100 is located at the rear side of the front edge 31F of the absorbent core 31, and the rear edge 100R of the low liquid-permeable portion 100 is located at the front side of the rear edge 31R of the absorbent core 31. According to this structure, the body fluid can be introduced and absorbed in the area outside the low liquid-permeable portion 100 in the front-back direction L. In addition, by providing the low liquid-permeable portion 100 in the area where the body fluid is discharged more and not providing the low liquid-permeable portion 100 outside the front-back direction L, the body fluid can be diffused to the outside in the front-back direction L through the low liquid-permeable portion 100, and the body fluid can be retained in a large range of the absorbent core 31. As a result, the absorbent core 31 does not absorb the body fluid locally, but can absorb the body fluid in the entire range of the absorbent core 31, and the entire range of the absorbent core 31 after absorbing the body fluid can be suppressed from deformation and distortion. In addition, the low liquid-permeable portion 100 can be arranged across a plurality of adhesive portions 60. That is, there may be a region where the low liquid-permeable portion 100 and the adhesive portion 60 overlap in the thickness direction T, a region where the low liquid-permeable portion 100 is arranged without the adhesive portion 60, and a region where the adhesive portion 60 is arranged without the low liquid-permeable portion 100.

[0062] Preferably, the adhesive portion 60 may be arranged so as to straddle the outer edge of the low-liquid-permeable portion 100. In the case where the rigidity of the low-liquid-permeable portion 100 is high, there is a concern that the outer edge (boundary) of the low-liquid-permeable portion 100 may touch the skin and cause discomfort. However, by arranging the adhesive portion so as to straddle the outer edge (boundary) of the low-liquid-permeable portion 100, the outer edge of the low-liquid-permeable portion 100 is fixed to the wearing article by the adhesive portion, so that the wearing article and the outer edge of the low-liquid-permeable portion 100 are closely attached to each other, thereby suppressing discomfort to the skin. More preferably, the adhesive portion 60 may straddle the outer edge of the low-liquid-permeable portion 100 in the width direction, or may straddle the outer edge of the low-liquid-permeable portion 100 in the front-to-back direction. Discomfort can be suppressed at the entire outer edge of the low-liquid-permeable portion 100. In addition, the structure that straddles the outer edge of the low-liquid-permeable portion 100 does not have to straddle the entire outer edge, but only needs to straddle at least a portion of it.

[0063] like Figure 5 As shown in (C), in a modified example, the low liquid permeable portion 100 of the absorbent article 1C can extend along the width direction W. That is, the low liquid permeable portion 100 can be horizontally long. According to this structure, the low liquid permeable portion 100 can be used to spread the body fluid along the width direction W, and the body fluid can be absorbed in a larger area in the width direction W. By expanding the absorption range of the body fluid, it is easy to suppress the situation where a large area of ​​body fluid is retained locally, and it is easy to maintain the rigidity of the absorbent core 31 after absorbing the body fluid. Figure 5 As shown in (C), in a modified example, the low liquid-permeable portion 100 of the absorbent article 1C may also extend in the width direction W and be continuously provided over the entire region of the absorbent core 31 in the width direction W. According to this structure, the region capable of maintaining the state of the absorbent core 31 before use can be continuously provided over the entire region of the absorbent core 31 in the width direction W. Figure 5 As shown in (D), in a modified example, the low liquid-permeable portion 100 of the absorbent article 1D may extend in the width direction W and be arranged in a local area of ​​the absorbent core 31 in the width direction W. By providing the low liquid-permeable portion 100 in an area where a large amount of body fluid is discharged and not providing the low liquid-permeable portion 100 outside the area in the width direction W, the body fluid can be diffused to the outside in the width direction W through the low liquid-permeable portion 100, and the body fluid can be retained in a larger area of ​​the absorbent core 31.

[0064] like Figure 5As shown in (D), the low liquid-permeable part 100 of the absorbent article 1D may extend in the width direction W and may be provided in plurality at intervals in the front-back direction L. According to this structure, the low liquid-permeable parts 100 are arranged at intervals in the front-back direction L, and there is an area where the low liquid-permeable part 100 is not arranged between the low liquid-permeable parts 100. When the absorbent article 1 is arranged along the roundness of the body from the front side to the back side of the body, the low liquid-permeable parts 100 can exert their performance without being deformed, and the performance of the low liquid-permeable parts 100 can be maintained by a certain low liquid-permeable part 100. In addition, while the body fluid is introduced to the non-skin side T2 in the area between the low liquid-permeable parts 100, the body fluid can be diffused in the width direction W by the low liquid-permeable parts 100, thereby absorbing the body fluid in a larger area in the width direction W. In addition, in an embodiment in which the rigidity of the low liquid-permeable part 100 is high, the deformation of the low liquid-permeable part 100 when being sandwiched by the legs can be suppressed, and the shape of the absorbent core 31 can be further maintained in the state before use. The pitch of the low liquid-permeable portion 100 in the front-to-back direction L may be different from the pitch of the adhesive portion 60 in the front-to-back direction L. That is, there may be a region where the low liquid-permeable portion 100 and the adhesive portion 60 overlap in the thickness direction T, a region where the low liquid-permeable portion 100 is arranged without the adhesive portion 60, and a region where the adhesive portion 60 is arranged without the low liquid-permeable portion 100.

[0065] like Figure 5 As shown in (E), in a modified example, the low liquid-permeable parts 100 of the absorbent article 1E may be arranged in a lattice shape. According to this structure, the area provided with the low liquid-permeable parts 100 and the area not provided with the low liquid-permeable parts 100 extend in the front-to-back direction L and the width direction W, respectively, so that the body fluid can be diffused over a wide range in the front-to-back direction L and the width direction W, and the introduction of the body fluid can be ensured in the area not provided with the low liquid-permeable parts 100.

[0066] In addition, the low liquid-permeable portion 100 may be provided in the excretion-orifice-opposing region S5 disposed opposite to the excretion orifice of the wearer. In the manner in which the absorbent article is symmetrical with respect to a linear axis passing through the center in the front-back direction L and extending in the width direction W as in the present embodiment, the excretion-orifice-opposing region S5 is disposed at the center in the front-back direction L of the absorbent article 1. That is, the low liquid-permeable portion 100 may straddle the center 1CL in the front-back direction L of the absorbent article 1. The excretion-orifice-opposing region S5 is the portion that is most likely to guide and absorb body fluids. By providing the low liquid-permeable portion 100 in the excretion-orifice-opposing region S5, the rigidity of the portion that is most likely to be deformed by absorbing body fluids can be maintained close to the state before use, and twisting during wearing can be effectively suppressed.

[0067] like Figure 5As shown in (F), in a modified example, the low liquid permeability portion 100 of the absorbent article 1F can be arranged in a manner not to span the center in the front-to-back direction L. According to this structure, the body fluid can be absorbed at the center 1CL in the front-to-back direction L where the body fluid of the absorbent article 1 is discharged more, and the discomfort caused by the decrease in the liquid introduction property can be suppressed. Figure 5 As shown in (F), in the absorbent article 1F, when the low liquid-permeable portion 100 is located forward of the center of the absorbent core 31 in the front-rear direction, the user can easily notice the existence of the low liquid-permeable portion 100 during installation and wearing.

[0068] The length of the low liquid-permeable portion 100 in the front-to-back direction L may be 50% or less relative to the length of the absorbent article 1 in the front-to-back direction L. The length of the low liquid-permeable portion 100 in the front-to-back direction L is 50% or less relative to the length of the absorbent article 1 in the front-to-back direction L, and the proportion of the low liquid-permeable portion 100 in the entire front-to-back direction of the absorbent core 31 is low. When worn, the cross-sectional shape of the absorbent article 1 along the front-to-back direction L is a curved shape that follows the shape of the body. By making the length of the low liquid-permeable portion 100 in the front-to-back direction L relatively short, it is easy to make the entire absorbent core 31 follow the curve of the body while suppressing the deformation of the low liquid-permeable portion 100. In addition, preferably, the length of the low liquid-permeable portion 100 in the front-to-back direction L may be 40% or less relative to the length of the absorbent article 1 in the front-to-back direction L, and more preferably, it may be 30% or less.

[0069] In order to facilitate the arrangement along the curve of the body, the length of the front-to-back direction L of the low liquid-permeable part 100 may be 90 mm or less, preferably 80 mm or less. In addition, in order to suppress the front and rear leakage of body fluids, the distance between the outer edge of the low liquid-permeable part 100 and the outer edge of the absorbent core 31 may be 20 mm or more, preferably 30 mm or more, and more preferably 40 mm or more. In addition, in order to ensure the performance of the low liquid-permeable part 100 in maintaining the shape of the absorbent core 31, the length of the front-to-back direction L of the low liquid-permeable part 100 may be 30 mm or more, preferably 40 mm or more, and more preferably 50 mm or more.

[0070] The length of the low liquid-permeable portion 100 in the width direction W may be 50% or less relative to the length of the absorbent core 31 in the width direction W. Since the length of the low liquid-permeable portion 100 in the width direction W is 50% or less relative to the entire region of the absorbent core 31 in the width direction W, the low liquid-permeable portion 100 is less likely to come into contact with the wearer's feet, etc., and can avoid being directly subjected to force, so that the low liquid-permeable portion 100 can be maintained, and the distortion of the absorbent core 31 can be reduced. In addition, if the length of the low liquid-permeable portion 100 in the width direction W is too long, there is a concern that the ratio of the low liquid-permeable portion 100 increases, the introduction of body fluid into the absorbent core 31 decreases, and leakage such as flow leakage occurs. However, since the length of the low liquid-permeable portion 100 in the width direction W is 50% or less relative to the entire region of the absorbent core 31 in the width direction W, the introduction of body fluid can be ensured in other regions, thereby suppressing leakage. In addition, preferably, the length of the low liquid-permeable part 100 in the width direction W is 40% or less relative to the length of the absorbent core 31 in the width direction W, and more preferably, is 30% or less relative to the length of the absorbent core 31 in the width direction W.

[0071] In order to suppress the discomfort with respect to the excretion opening, the length of the width direction W of the low liquid-permeable part 100 may be 40 mm or less, preferably 30 mm or less, and more preferably 20 mm or less. In order to suppress the discomfort with respect to the legs, the length of the width direction W of the low liquid-permeable part 100 may be 60 mm or less, preferably 40 mm or less, and more preferably 30 mm or less. Furthermore, in order to suppress the discomfort with respect to the legs, the distance between the outer edge of the low liquid-permeable part 100 and the outer edge of the absorbent article may be 20 mm or more, preferably 30 mm or more, and more preferably 40 mm or more. In addition, in order to suppress the side leakage of body fluid, the distance between the outer edge of the low liquid-permeable part 100 and the outer edge of the absorbent core 31 may be 20 mm or more, preferably 30 mm or more, and more preferably 40 mm or more. In addition, in order to ensure the performance of the low liquid-permeable part 100 in maintaining the shape of the absorbent core 31, the length of the width direction W of the low liquid-permeable part 100 may be 5 mm or more, preferably 10 mm or more, and more preferably 15 mm or more.

[0072] The low liquid-permeable portion 100 may be composed of at least any one of the components arranged on the target member. The low liquid-permeable portion 100 may be provided in one component or in multiple components. The low liquid-permeable portion 100 only needs to be provided between the non-skin surface of the top sheet 10 and the non-skin surface of the absorbent core 31, and the position in the thickness direction T within this range is not limited. The low liquid-permeable portion 100 may be provided continuously in the thickness direction T between the non-skin surface of the top sheet 10 and the non-skin surface of the absorbent core 31, or may be provided in a part of the thickness direction T.

[0073] like Figure 3and Figure 4 As shown, the low liquid permeable part 100 can be provided between the top sheet 10 and the absorbent core 31. According to this structure, it is possible to suppress the absorption of body fluid in the area of ​​the absorbent core 31 that overlaps with the low liquid permeable part 100, and since the low liquid permeable part 100 and the absorbent core 31 are provided separately, it is easy to ensure the absorption performance of the absorbent core 31. As the low liquid permeable part 100 provided between the top sheet 10 and the absorbent core 31, specifically, for example, a second sheet, a core wrap sheet, a resin film of this embodiment, an adhesive, and a waterproofing agent can be exemplified. In addition, a member obtained by applying a waterproofing agent to a non-woven fabric having hydrophilic fibers, and a member obtained by filming a part of the non-woven fabric having hydrophilic fibers by a welding process or the like can also be used as the low liquid permeable part 100.

[0074] In a modified example, Figure 5 As shown in (G), the low liquid-permeable portion 100 of the absorbent article 1G can be provided in the absorbent core 31. According to this embodiment, when a part of the absorbent core 31 is the low liquid-permeable portion 100, it is not easy to absorb body fluids by the absorbent core 31, so the rigidity of the absorbent core 31 can be maintained. In addition, the introduction of body fluids can be ensured in the top sheet 10 and the like arranged at a position closer to the skin side T1 than the low liquid-permeable portion 100, thereby suppressing liquid residue on the surface of the absorbent article 1. As a result, skin troubles caused by body fluids remaining on the surface of the absorbent article 1 can be suppressed.

[0075] In a modified example, Figure 5 As shown in (H), the absorbent article 1H may include a second sheet 40 disposed between the top sheet 10 and the absorbent core 31, and the low liquid-permeable portion 100 is disposed between the top sheet 10 and the second sheet. According to this embodiment, the low liquid-permeable portion 100 can be disposed at a position separated from the absorbent core 31, which can reduce the possibility of the absorbent core 31 absorbing body fluids, thereby further reducing the change in the stiffness of the absorbent core 31 before and after absorbing body fluids.

[0076] The low liquid-permeable portion 100 may be composed of a liquid-impermeable sheet disposed at a position closer to the skin side T1 than the absorbent core 31 as in the present embodiment. The liquid-impermeable sheet can be exemplified by the resin film 50 of the present embodiment, and cellophane can be exemplified as another structure. According to this structure, the absorption of body fluid from the skin side can be suppressed by the liquid-impermeable sheet, thereby ensuring the rigidity of the region of the absorbent core 31 overlapping with the sheet.

[0077] In addition, the low liquid-permeable part 100 may be formed by a hydrophobic coating agent applied to at least one of the absorbent core 31, the top sheet 10, and the sheet disposed between the absorbent core 31 and the top sheet 10. According to this structure, the absorption of body fluid from the skin side can be suppressed by the hydrophobic coating agent, thereby ensuring the rigidity of the region of the absorbent core 31 overlapping with the adhesive. Examples of the hydrophobic coating agent include an adhesive (HMA type adhesive) and a waterproof agent (silicone). As a method of forming the low liquid-permeable part 100 with a coating agent, there can be exemplified a structure in which the coating area of ​​the low liquid-permeable part 100 is thicker than the surrounding area (permeated to the inside of the component); a structure in which the area ratio of the coating agent per unit area of ​​the low liquid-permeable part 100 is higher than the surrounding area (the surrounding area is intermittently coated in a spiral or the like, and the area corresponding to the low liquid-permeable part 100 is non-intermittently coated); and a structure in which the coating agent is not applied to the surrounding area but is applied only to the area constituting the low liquid-permeable part 100.

[0078] like Figure 5 As shown in (G), in a modified example, the low liquid permeability portion 100 of the absorbent article 1G can be composed of a compression portion 35 formed by compressing at least the absorbent core 31 in the thickness direction. The compression portion 35 can be formed by compressing only the absorbent core 31, or by compressing the absorbent core 31 together with other sheets (such as a core wrap sheet, a second sheet, etc.). The low liquid permeability portion 100 composed of the compression portion 35 has a high rigidity, which can further ensure the rigidity of the absorbent core 31. More preferably, when forming the compression portion 35, silicon can be applied to the portion where the compression portion 35 is set, and the silicon can be transferred to the compression portion. According to this structure, the transfer speed of body fluid at the low liquid permeability portion 100 can be further reduced. In addition, as another preferred embodiment, when the component (absorbent core 31, etc.) forming the compression portion 35 contains a thermoplastic resin, the thermoplastic resin can be melted when the compression portion 35 is formed. According to this structure, the transfer speed of body fluid at the low liquid permeability portion 100 can be further reduced.

[0079] like Figure 5 As shown in (I), the inspection member 200 for inspecting the health status of the wearer may be arranged in the region overlapping the low liquid-permeable portion 100 and closer to the non-skin side T2 than the low liquid-permeable portion 100. Figure 5In the mode shown in (I), a resin film 50 constituting the low liquid permeability portion 100 is arranged on the skin side T1 of the inspection member 200. By arranging the inspection member 200 in the area overlapping with the low liquid permeability portion 100, it is possible to avoid excessive body fluid from contacting the inspection member 200, thereby suppressing erroneous reactions. In addition, in a structure in which the low liquid permeability portion 100 is not easily twisted, it is possible to avoid excessive pressure being applied to the inspection member 200, thereby avoiding the generation of folds and wrinkles in the inspection member 200. The inspection member can be, for example, a member that uses an indicator to display the health status of the wearer (a color indicating the health status), for example, the inspection member described in Japanese Patent Gazette No. 2020-022585 can be applied. In addition, as long as the low liquid permeability portion 100 covers at least a portion of the inspection member 200, preferably, the low liquid permeability portion 100 can also cover the entire inspection member 200.

[0080] The present invention has been described in detail using the above-mentioned embodiments, but it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as a modification and variation without departing from the gist and scope of the present invention as determined by the description of the claims. Therefore, the description of this specification is for the purpose of illustration and does not have any restrictive meaning on the present invention.

[0081] In addition, the entire contents of Japanese Patent Application No. 2022-120400 filed on July 28, 2022 are incorporated into this specification by reference.

[0082] Industrial Applicability

[0083] According to the present invention, it is possible to provide an absorbent article that is easy to maintain the absorption performance of the absorbent core while suppressing liquid residue on the top sheet.

[0084] Description of Reference Numerals

[0085] 1. Absorbent article; 10. Top sheet; 20. Back sheet; 31. Absorbent core; 35. Compression portion; 50. Resin film (liquid-impermeable sheet); 60. Adhesive portion; 100. Low liquid-permeable portion; 200. Inspection member; L, front-to-back direction; RC, central area; S5, area opposite to the excretion port; T, thickness direction; T1, skin side; T2, non-skin side; W, width direction.

Claims

1. An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent core disposed between the top sheet and the back sheet, wherein: A low liquid permeable portion having a lower transfer speed of body fluid from the skin side to the non-skin side than the surrounding area is provided at a position closer to the non-skin side than the non-skin side of the top sheet and closer to the skin side than the non-skin side of the absorbent core. The low liquid-permeable portion is disposed in a central region located in the center in the width direction of a region obtained by dividing the absorbent core into three equal parts in the width direction.

2. The absorbent article according to claim 1, wherein The rigidity of the region where the low liquid-permeable portion is provided is higher than the rigidity of the region around the low liquid-permeable portion.

3. An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent core disposed between the top sheet and the back sheet, wherein: A low liquid permeable portion having a lower transfer speed of body fluid from the skin side to the non-skin side than the surrounding area is provided at a position closer to the non-skin side than the non-skin side of the top sheet and closer to the skin side than the non-skin side of the absorbent core. The low liquid permeability portion is arranged on the absorbent core, The absorption amount per unit area of ​​the portion of the absorbent core where the low liquid-permeable portion is provided is lower than the absorption amount per unit area of ​​the portion of the absorbent core around the low liquid-permeable portion. The rigidity of the region where the low liquid-permeable portion is provided is higher than the rigidity of the region around the low liquid-permeable portion.

4. The absorbent article according to any one of claims 1 to 3, wherein The low liquid-permeable portion is composed of a liquid-impermeable sheet disposed on the skin side of the absorbent core.

5. The absorbent article according to any one of claims 1 to 3, wherein The low liquid-permeable portion is formed of a hydrophobic coating agent applied to at least any one of the absorbent core, the top sheet, and a sheet disposed between the absorbent core and the top sheet.

6. The absorbent article according to any one of claims 1 to 3, wherein The low liquid-permeable portion is composed of a compressed portion formed by compressing at least the absorbent core in the thickness direction.

7. The absorbent article according to any one of claims 1 to 3, wherein The low liquid-permeable portion is disposed between the top sheet and the absorbent core.

8. The absorbent article according to claim 1 or 2, wherein: The low liquid-permeable portion is provided in the absorbent core.

9. The absorbent article according to any one of claims 1 to 3, wherein The absorbent article has a second sheet disposed between the top sheet and the absorbent core. The low liquid-permeable portion is disposed between the top sheet and the second sheet.

10. The absorbent article according to any one of claims 1 to 3, wherein The low liquid-permeable portion extends across the center of the absorbent core in the width direction.

11. The absorbent article according to any one of claims 1 to 3, wherein The low liquid-permeable portion extends in the front-rear direction.

12. The absorbent article according to claim 11, wherein A plurality of the low liquid-permeable portions are provided at intervals in the width direction.

13. The absorbent article according to any one of claims 1 to 3, wherein The low liquid-permeable portion extends in the width direction, and a plurality of the low liquid-permeable portions are arranged at intervals in the front-rear direction.

14. The absorbent article according to claim 13, wherein The length of the low liquid-permeable portion in the width direction is 50% or less of the length of the absorbent core in the width direction.

15. The absorbent article according to any one of claims 1 to 3, wherein The low liquid-permeable portion is provided in an excretion-opposing region that is arranged to oppose an excretion opening of a wearer.

16. The absorbent article according to any one of claims 1 to 3, wherein The low liquid-permeable portion is provided so as not to extend across the center in the front-rear direction.

17. The absorbent article according to any one of claims 1 to 3, wherein An inspection member for inspecting the health condition of the wearer is arranged in a region overlapping the low liquid-permeable portion on the non-skin side of the low liquid-permeable portion.

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