Absorbent article

Abstract

An absorbent (1) comprising an absorbent core (11) having a longitudinal direction, width direction, and thickness direction orthogonal to each other and including pulverized fibers is characterized in that the pulverized fibers include hardwood fibers composed of hardwood, the absorbent core (11) is provided with an oil agent (Y) that promotes diffusion of excretion, when divided into three equal parts in either the longitudinal direction or the width direction, the absorbent core (11) includes one side portion, a central portion, and another side portion in order from one side, and the basis weight of the oil agent (Y) provided in the central portion is higher than the basis weight of the oil agent provided in the one side portion.

Description

absorbent articles

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

[0002] Absorbent articles such as sanitary napkins that absorb body exudates are known. When body exudates such as menstrual blood are excreted while the sanitary napkin is being worn, it is preferable that the absorbent article quickly absorb the exudates. For example, Patent Document 1 discloses a sanitary napkin that includes a top sheet that contacts the wearer's skin and an absorbent body on the side away from the skin of the top sheet. In order to promote absorption of highly viscous body exudates such as menstrual blood while the sanitary napkin is worn, a blood slipping agent is provided in the top sheet, which facilitates the transfer of exuded body exudates from the top sheet to the absorbent body, thereby reducing the stickiness of the skin side of the top sheet.

[0003] JP 2013-179982 A

[0004] However, while the sanitary napkin described in Patent Document 1 promotes the absorption of bodily exudates, it also promotes excessive diffusion of the bodily exudates in the sanitary napkin, which may result in leakage of the bodily exudates from the sanitary napkin.

[0005] The present invention has been made in consideration of the above-mentioned conventional problems, and its purpose is to provide an absorbent article that suppresses the diffusion of excrement on one side of the absorbent article in the longitudinal or width direction, thereby reducing the risk of excrement leaking outside the end of one side of the absorbent article in the longitudinal or width direction.

[0006] The main invention for achieving the above object is an absorbent article having an absorbent core with longitudinal, width, and thickness directions that are perpendicular to each other and containing pulverized fibers, wherein the pulverized fibers include hardwood fibers made from hardwood, the absorbent core is provided with an oil agent that promotes the diffusion of excrement, and when the absorbent core is divided into thirds in either the longitudinal or width direction, the absorbent article has, in order from one side, one side, a central portion, and another side portion, and the basis weight of the oil agent provided in the central portion is higher than the basis weight of the oil agent provided in the one side. Other features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[0007] According to the present invention, the diffusion of excrement on one side of the absorbent article in the longitudinal or width direction can be suppressed, and the risk of excrement leaking outside the end on one side of the absorbent article in the longitudinal or width direction can be reduced.

[0008] FIG. 3 is a plan view of the napkin 1 as viewed from the skin side. FIG. 4 is a plan view of the napkin 1 as viewed from the non-skin side. FIG. 5 is a schematic cross-sectional view taken along the arrows A-A in FIG. 1. FIG. 4A is a plan view of the absorbent core 11. FIG. 4B is a schematic cross-sectional view taken along the arrows J-J in FIG. 4A. FIG. 5 is an enlarged schematic cross-sectional view taken along the arrows K-K in FIG. 4A. FIG. 6 is an enlarged schematic view of the absorbent body 10 in FIG. 3. FIG. 6 is a plan view of the absorbent body 10 as viewed from the skin side. FIG. 7 is a schematic plan view illustrating a region where oil agent Y is provided. FIG. 8 is a schematic cross-sectional view illustrating a region where oil agent Y is provided. FIG. 9 is a plan view of the napkin 100 as viewed from the non-skin side.

[0009] The present specification and the accompanying drawings make at least the following clear: (Aspect 1) An absorbent article comprising an absorbent core having longitudinal, width, and thickness directions that are orthogonal to one another, and having pulverized fibers, wherein the pulverized fibers include hardwood fibers made from hardwood, the absorbent core is provided with an oil agent that promotes the diffusion of bodily waste, and when the absorbent core is divided into thirds in either the longitudinal or width direction, the absorbent article has, in order from one side, one side, a central portion, and another side portion, and the basis weight of the oil agent provided in the central portion is higher than the basis weight of the oil agent provided in the one side portion.

[0010] According to Aspect 1, by making the basis weight of the oil agent applied to the center portion higher than the basis weight of the oil agent applied to one side portion in either the longitudinal direction or the width direction, the oil agent is more likely to promote diffusion in the center portion of the absorbent core. On the other hand, at one side portion of the absorbent core, while the absorbent core contains hardwood fibers, by making the basis weight of the oil agent applied to one side portion of the absorbent core lower than the basis weight of the oil agent applied to the center portion, diffusion of body exudates at one side portion in the longitudinal direction or width direction of the absorbent core and the absorbent article can be suppressed, and the risk of body exudates leaking outside one end of the absorbent article in the longitudinal direction or width direction can be reduced. Furthermore, when wearing the absorbent article, the wearer can visually confirm that body exudates are more likely to diffuse in the center portion of the absorbent core and less likely to diffuse at one side portion in the longitudinal direction or width direction, which can more easily alleviate the wearer's concerns about the possibility of body exudates leaking from the absorbent article.

[0011] (Aspect 2) The absorbent article of Aspect 1, wherein the pulverized fibers also contain coniferous fibers made of coniferous trees, and the total weight of the hardwood fibers is greater than the total weight of the coniferous fibers.

[0012] According to aspect 2, the absorbent core contains a large amount of hardwood fibers with a short average fiber length, which makes it easier for the oil agent to promote absorption in the center of the absorbent core while making it easier to suppress the diffusion of excrement on one side of the absorbent core in the longitudinal or width direction.

[0013] (Aspect 3) The absorbent article of Aspect 1 or 2 has a top sheet that can come into contact with the wearer's skin, the top sheet also has the oil agent applied thereto, and the basis weight of the oil agent applied to the portion of the top sheet that overlaps with the central portion is higher than the basis weight of the oil agent applied to the portion that overlaps with the one side portion when viewed in the thickness direction.

[0014] According to the third aspect, the oil agent facilitates the promotion of absorption in the central portion of the absorbent core, while also making it easier to suppress the diffusion of excrement at one side portion in the longitudinal or width direction of the absorbent core.

[0015] (Aspect 4) The absorbent article according to any one of Aspects 1 to 3, wherein the oil is an amphipathic substance.

[0016] According to the fourth aspect, the surface tension of the excrement can be easily changed, and the diffusion of the excrement in the absorbent core can be easily promoted.

[0017] (Aspect 5) An absorbent article according to any one of aspects 1 to 4, characterized in that it has a core wrap sheet on the skin side of the absorbent core, and no adhesive is provided between the skin side of the absorbent core and the non-skin side of the core wrap sheet.

[0018] According to aspect 5, the oil and adhesive blend together on the skin side of the absorbent core, causing the excrement to diffuse on the skin side of the core wrap sheet, and the excrement is absorbed from the core wrap sheet into the absorbent core, reducing the risk of excessive diffusion in the absorbent core and thereby reducing the risk of excrement leaking outside the absorbent article.

[0019] (Aspect 6) An absorbent article according to any one of aspects 1 to 5, characterized in that it has a core wrap sheet on the non-skin side of the absorbent core, and no adhesive is provided between the non-skin side of the absorbent core and the skin side of the core wrap sheet.

[0020] According to aspect 6, the oil and adhesive blend together on the non-skin side of the absorbent core, causing the excrement to diffuse on the skin side of the core wrap sheet, and the excrement is absorbed from the core wrap sheet into the absorbent core, reducing the risk of excessive diffusion in the absorbent core and thereby reducing the risk of excrement leaking outside the absorbent article.

[0021] (Aspect 7) The absorbent article of any one of Aspects 1 to 6, characterized in that the absorbent article has a post-treatment tab or a post-treatment tape on the non-skin side thereof, and the oil does not overlap the post-treatment tab or the post-treatment tape when viewed in the thickness direction.

[0022] According to aspect 7, an absorbent core that has had excrement spread by the oil agent is prone to losing its shape. Therefore, by providing a post-treatment tab or post-treatment tape in a position that does not overlap with the oil agent when viewed in the thickness direction, the position that does not overlap with the oil agent when viewed in the thickness direction is a part of the absorbent core that is less likely to lose its shape, so when the absorbent article is rolled up and disposed of after use, the absorbent core can be easily rolled up without losing its shape.

[0023] (Aspect 8) An absorbent article according to any one of aspects 1 to 7, characterized in that the absorbent article has a non-skin-side sheet on the side closest to the skin, the non-skin-side sheet has an adhesive portion on the non-skin-side surface, and when viewed in the thickness direction, has an overlapping region where the adhesive portion overlaps with the portion where the oil agent is provided, and a non-overlapping region where the adhesive portion overlaps with the portion where the oil agent is not provided, and the adhesive strength of the adhesive portion in the overlapping region is lower than the adhesive strength of the adhesive portion in the non-overlapping region.

[0024] The adhesive portion provided on the non-skin side of the absorbent article is provided to secure the absorbent article to the wearer's clothing when worn. According to Aspect 8, the risk of the adhesive strength of the adhesive portion becoming excessively strong is reduced, and the overlapping region, which has absorbed a lot of body fluid and is prone to wrinkling after use, can be removed from the absorbent article with little force, making it less likely for the absorbent core in the overlapping region to lose its shape and making it easier to discard.

[0025] (Aspect 9) The absorbent article of any one of Aspects 1 to 8, wherein the absorbent core has a core wrap sheet on the skin side of the absorbent core, and the average fiber length of the fibers of the core wrap sheet is equal to or greater than the average fiber length of the crushed fibers of the absorbent core.

[0026] According to the ninth aspect, when worn, the core wrap sheet promotes the absorption and diffusion of excrement, which facilitates the penetration of excrement into the absorbent core located on the non-skin side.

[0027] (Aspect 10) The absorbent article of any one of Aspects 1 to 9, wherein the basis weight of the oil agent applied to the central portion is higher than the basis weight of the oil agent applied to the one side portion in the longitudinal direction and the width direction.

[0028] According to aspect 10, it is possible to promote the diffusion of excrement in the central portion of the absorbent core in the longitudinal and width directions, while reducing the risk of excrement leaking from the outside of one side of the absorbent article in the longitudinal and width directions.

[0029] (Aspect 11) The absorbent article of aspect 10, wherein the oil agent is not provided on the outer edge of the one side portion.

[0030] According to aspect 11, it is easier to suppress diffusion at the outer end of one side of the absorbent core in the longitudinal and width directions, thereby reducing the risk of excrement leaking from the outside of one side of the absorbent article in the longitudinal and width directions.

[0031] (Aspect 12) The absorbent article of any of Aspects 1 to 11, further comprising a topsheet capable of contacting the skin of a wearer, the topsheet also being provided with the oil, the width of the topsheet being longer than the width of the absorbent core, the absorbent core having a core oil-agent-present region where the oil is provided and a core oil-absent region where the oil is not provided, the topsheet having a surface oil-agent-present region where the oil is provided and a surface oil-absent region where the oil is not provided, and having, in the thickness direction, a first region where the core oil-agent-present region and the surface oil-agent-present region overlap, a second region where the core oil-agent-absent region and the surface oil-agent-present region overlap, and a third region where the surface oil-agent-absent region does not overlap with the absorbent core, the first region, the second region, and the third region being provided from the inside to the outside in the width direction in this order: first region, second region, third region.

[0032] According to aspect 12, it is possible to promote diffusion in the first region of the absorbent article while making it easier to suppress diffusion in the second and third regions, thereby reducing the risk of excrement leaking outside the absorbent article.

[0033] (Aspect 13) The absorbent article of Aspect 12 is characterized in that the core oil-agent-present region has a core oil-rich region in the first region where the basis weight of the oil is higher than that of the surrounding area, and the surface oil-agent-present region has a surface oil-thin region in the first region where the basis weight of the oil is lower than that of the surrounding area, and the core oil-rich region and the surface oil-thin region overlap at a center in the width direction and a center in the length direction of the first region when viewed in the thickness direction.

[0034] According to Aspect 13, when worn, the thin surface oil area reduces the risk of the oil having a negative effect on the wearer's excretory opening, while the surface oil area in the first region facilitates penetration of excrement into the topsheet. Furthermore, by having a core oil-rich area that overlaps the thin surface oil area in the thickness direction, the overlapping portion of the core oil-rich area and the thin surface oil area in the thickness direction facilitates transfer of excrement from the topsheet to the absorbent core, thereby reducing the risk of excrement spreading and leaking on the skin-facing surface of the absorbent article.

[0035] (Aspect 14) An absorbent article according to any one of aspects 1 to 13, characterized in that it has a top sheet that can come into contact with the wearer's skin, the top sheet is also provided with the oil agent, the length of the top sheet in the width direction is longer than the length of the absorbent core in the width direction, and the oil agent is not provided outside the absorbent core in the width direction.

[0036] According to aspect 14, diffusion at the widthwise ends of the absorbent core can be easily suppressed, thereby reducing the risk of excrement leaking outside the absorbent article.

[0037] (Aspect 15) The absorbent article of any one of Aspects 1 to 14, further comprising a compression section that compresses the absorbent core in the thickness direction, the compression section comprising a rear compression section located rearward of the center of the absorbent article in the longitudinal direction, and the rear end of the oil agent being located forward of the front end of the rear compression section.

[0038] According to aspect 15, since the rear compressed portion, which has a high fiber density, is likely to promote diffusion due to capillary action, by providing an oil agent forward of the front end of the rear compressed portion, it is easier to suppress diffusion behind the absorbent core, thereby reducing the risk of excrement leaking outside the absorbent article.

[0039] (Aspect 16) An absorbent article according to any one of aspects 1 to 15, characterized in that the weight per unit volume of the oil agent applied closer to the skin than the center in the thickness direction of the absorbent core is heavier than the weight per unit volume of the oil agent applied closer to the skin than the center in the thickness direction of the absorbent core.

[0040] According to the sixteenth aspect, excrement absorbed from the skin side is more easily absorbed toward the non-skin side.

[0041] (Aspect 17) The absorbent article according to any one of aspects 1 to 16, further comprising a folded portion along the width direction, and the oil agent being provided across the folded portion in the longitudinal direction.

[0042] According to aspect 17, the folded portion tends to increase the density of the absorbent core and promotes diffusion in the width direction, but by having the oil agent cross the folded portion in the longitudinal direction, it is more likely to promote diffusion in the longitudinal direction, and the risk of excrement leaking outside the width direction of the absorbent article is more likely to be reduced.

[0043] This Embodiment Hereinafter, a sanitary napkin will be described as an example of an absorbent article according to this embodiment. However, the sanitary absorbent article is not limited to a sanitary napkin, and may be a shorts-type napkin, a pants-type disposable diaper, a tape-type disposable diaper, an absorbent pad, or the like.

[0044] <<<Configuration of the napkin 1 of this embodiment>>> Fig. 1 is a plan view of the napkin 1 as seen from the skin side. Fig. 2 is a plan view of the napkin 1 as seen from the non-skin side. Fig. 3 is a schematic cross-sectional view taken along the arrows A-A in Fig. 1. The napkin 1 has a longitudinal direction, a width direction, and a thickness direction. In the longitudinal direction, the side that contacts the wearer's lower abdomen is the front side, and the side that contacts the wearer's buttocks is the rear side. In the thickness direction, the side that contacts the wearer's skin is the skin side, and the opposite side is the non-skin side. The center line C-C shown in Fig. 1 etc. indicates the center of the napkin 1 in the width direction, and the center line CL indicates the center of the napkin 1 in the longitudinal direction. The cross-sectional views in Fig. 3 etc. show the napkin 1 schematically, and the dimensions are not necessarily accurate.

[0045] The napkin 1 has an absorbent body 10, a top sheet 21, a pair of side sheets 23, and a back sheet 31. A sheet-like second sheet 22 may be provided on the skin side of the absorbent body 10 and on the non-skin side of the top sheet 21. Each of the materials adjacent to each other in the thickness direction is joined with an adhesive such as hot melt.

[0046] The napkin 1 has a pair of wing portions 1W extending outward in the width direction from the center in the longitudinal direction. The wing portions 1W are mainly formed by the side sheets 23 and the back sheet 31. However, the napkin 1 does not necessarily have to have the wing portions 1W.

[0047] The top sheet 21 is a liquid-permeable sheet located closer to the skin than the absorbent body 10. The top sheet 21 is a surface sheet located closer to the skin than the absorbent body 10 and capable of contacting the wearer's skin. Examples of the top sheet 21 include flexible sheets such as nonwoven fabrics made of synthetic fibers such as polyethylene (PE) and polypropylene (PP) (e.g., air-through nonwoven fabrics and spunbond nonwoven fabrics), synthetic resin films with through holes, and cotton nonwoven fabric sheets. The top sheet 21 of this embodiment is formed from a liquid-permeable sheet of polyethylene terephthalate (PET) and polyethylene (PE), or air-through nonwoven fabrics or spunlace nonwoven fabrics containing water-retentive fibers such as cotton or rayon.

[0048] The pair of side sheets 23 are provided on the non-skin side of the top sheet 21 and the second sheet 22 and on the skin side of the absorbent body 10, and are sheets that extend outward from both widthwise side edges of the top sheet 21, etc. Examples of the side sheets 23 include the same soft, liquid-permeable nonwoven fabric as the top sheet 21, and a hydrophobic nonwoven fabric. Furthermore, a reinforcing sheet 24 is provided on the widthwise outer side of the top sheet 21, the second sheet 22, and the absorbent body 10, between the side sheets 23 and the back sheet 31 in the thickness direction, to reinforce the strength of the side sheets 23. The reinforcing sheet 24 can be, for example, the same sheet material as the back sheet 31, such as paper or SMS.

[0049] The back sheet (non-skin side sheet) 31 is located closer to the skin than the absorbent body 10 and is the sheet provided closest to the skin side of the napkin 1. An example of the back sheet 31 is a liquid-impermeable sheet such as a polyethylene (PE) resin film. The shape of the back sheet 31 is substantially the same as the outer shape of the napkin 1.

[0050] The back sheet 31 has a plurality of main adhesive portions (adhesive portions) 32 on the non-skin side. In this embodiment, the main adhesive portions 32 are regions to which a plurality of strips of hot melt adhesive are applied along the longitudinal direction. When the napkin 1 is worn, the main adhesive portions 32 are attached to the inside of the crotch area of ​​the underwear (garment), thereby preventing the napkin 1 from shifting position relative to the wearer's body.

[0051] The wing portion 1W has a wing adhesive portion 33 on the non-skin-facing side of the back sheet 31. In this embodiment, the wing adhesive portion 33 is a rectangular area to which hot melt adhesive is applied. When wearing the napkin 1, the wing portion 1W is folded back to the non-skin-facing side of the underwear, and the wing adhesive portion 33 is attached to the non-skin-facing side of the underwear in the crotch area, thereby securing the napkin 1 to the underwear.

[0052] The position where the adhesive wing portions 33 overlap in the longitudinal direction (see FIG. 1 ) is the crotch region CA. The crotch region CA is the region that comes into contact with the wearer's crotch in the longitudinal direction when the garment is worn, and is the region that comes into contact with the blood drainage port through which the wearer's body waste is discharged.

[0053] The absorbent body 10 includes an absorbent core 11 and a core wrap sheet 12. The absorbent core 11 is formed by molding liquid-absorbent fibers into a predetermined shape and contains crushed fibers as the liquid-absorbent fibers. The crushed fibers include hardwood fibers made from hardwood. The absorbent core 11 of this embodiment contains crushed fibers (pulp fibers), and is formed solely from hardwood fibers (100% hardwood fibers). Note that the absorbent core 11 is not limited to crushed hardwood fibers; the crushed fibers may include pulp fibers such as softwood fibers made from softwood trees in addition to hardwood fibers. The absorbent core 11 may also include liquid-absorbent fibers such as cellulosic absorbent fibers, synthetic fibers made from polyolefins, polyesters, acrylics, acrylates, etc., or superabsorbent polymers (SAPs). FIG. 4A is a plan view of the absorbent core 11. FIG. 4B is a schematic cross-sectional view taken along the arrows J-J in FIG. 4A. Fig. 5 is an enlarged schematic view of a cross section taken along the line K-K in Fig. 4A. Fig. 6 is an enlarged view of the absorbent body 10 in Fig. 3. Note that in Figs. 4A, 4B and 5, irregularities caused by compressed portions such as compressed portion EL are omitted.

[0054] The absorbent core 11 has a central portion 11d, which has a higher basis weight of liquid-absorbent fibers than the surrounding area. The central portion 11d is a portion of the absorbent core 11 where the thickness (length in the thickness direction) is greater than the surrounding area. In this embodiment, the central portion 11d is a portion that protrudes toward the skin in the thickness direction and is a generally elliptical region in a planar view. By locating the central portion 11d in the center of the absorbent core 11 in the width direction and in a position that overlaps with the crotch region CA in a planar view, the central portion 11d is more likely to contact the wearer's excretory opening when worn, making it easier for the napkin 1 to fit the wearer's body and quickly absorb excrement. Furthermore, by locating the central portion 11d, which has a higher basis weight of liquid-absorbent fibers, in a position that overlaps with the crotch region CA in a planar view, excrement discharged from the wearer's excretory opening is more likely to be retained within the absorbent core 11 when worn.

[0055] The core wrap sheet 12 is a liquid-permeable sheet member. In this embodiment, the core wrap sheet 12 is a tissue containing cellulose fibers. By covering the absorbent core 11, the core wrap sheet 12 maintains the shape of the absorbent core 11 and promotes the diffusion of liquid into the absorbent core 11.

[0056] As shown in FIG. 6 , the core wrap sheet 12 has a skin-side portion 12a located closer to the skin than the absorbent core 11 and a non-skin-side portion 12b located closer to the skin than the absorbent core 11. In this embodiment, as shown in FIG. 6 and other figures, both side edges of the core wrap sheet 12 are folded back toward the skin side of the absorbent core 11, thereby covering the skin side and non-skin side of the absorbent core 11 with the core wrap sheet 12. Specifically, the core wrap sheet 12 wraps the absorbent core 11 so as to cover the widthwise side edges of the absorbent core 11, with the leading end 12ea of ​​the core wrap sheet 12 on the outside and the leading end 12eb on the other side on the inside. However, the shape and configuration of the core wrap sheet 12 are not limited thereto. For example, the core wrap sheet 12 may be configured as two sheet members, one on the skin side and one on the non-skin side of the absorbent core 11. Note that no adhesive is provided on the inside of the core wrap sheet 12 in this embodiment. In other words, the absorbent core 11 and the core wrap sheet 12 are not fixed together with an adhesive, and the absorbent core 11 is maintained in shape by being wrapped in the core wrap sheet 12 .

[0057] Figure 7 is a plan view of the absorbent body 10 as seen from the skin side. In Figure 7, the central high portion 11d of the absorbent core 11 is omitted. As shown in Figure 7, the absorbent body 10 has a central compressed portion 14 and multiple absorbent body compressed portions 15. The central compressed portion 14 and the absorbent body compressed portions 15 are portions where the absorbent core 11 and the core wrap sheet 12 are compressed in the thickness direction, respectively.

[0058] The central compression section 14 and the absorbent body compression section 15 are formed, for example, by passing the absorbent body 10 in the manufacturing process through a roll nip between a convex roller having multiple convex sections and an anvil roller with a flat surface to compress it. In this embodiment, the central compression section 14 and the absorbent body compression section 15 are portions of the absorbent body 10 that are pressed from the non-skin side to the skin side by passing the absorbent body 10 through the roll nip with the convex roller in contact with the non-skin side of the absorbent body 10 and the anvil roller in contact with the skin side, respectively.

[0059] The central compressed section 14 is a linear compressed section provided along the longitudinal direction and at the center in the width direction. The central compressed section 14 is a section that is recessed in the thickness direction from the skin side or non-skin side from the front end to the rear end of the absorbent body 10. The central compressed section 14 is a guide section that guides the absorbent body 10 to bend toward the skin side in the thickness direction, starting from the central compressed section 14. Furthermore, because the central compressed section 14 has a higher fiber density than the uncompressed section, it also serves as a guide section that guides excrement in the longitudinal direction by capillary action.

[0060] The absorbent body compressed sections 15 are compressed sections arranged in a generally staggered pattern across the entire absorbent body 10. In this embodiment, the absorbent body compressed sections 15 are provided with a plurality of oval-shaped compressed sections. Like the central compressed section 14, the absorbent body compressed sections 15 are also sections that are recessed in the thickness direction from the skin side or non-skin side. Providing the absorbent body compressed sections 15 makes it easier to maintain the shape of the absorbent body 10. Furthermore, since the absorbent body compressed sections 15 have a higher fiber density than the uncompressed sections, they are sections of the absorbent core 11 that are more likely to absorb excrement due to capillary action. The difference in density between the absorbent body compressed sections 15 and the uncompressed sections makes it easier to suppress the diffusion of oil agent Y in the absorbent core 11, which will be described later.

[0061] As shown in Figure 1 and other figures, the napkin 1 has linear compressed portions EL and circular compressed portions ee. The linear compressed portions EL are formed by compressing at least a portion of the top sheet 21, second sheet 22, and absorbent body 10 in the thickness direction. The linear compressed portions EL of the napkin 1 of this embodiment include a front compressed portion ELa located forward of the longitudinal centerline CL, a rear compressed portion ELb located rearward of the centerline CL, and a central compressed portion ELc located between the front compressed portion ELa and the rear compressed portion ELb. The inclusion of the linear compressed portions EL strengthens the bonding of the various components in the thickness direction, increases fiber density, and improves liquid absorption. The linear compressed portions EL are linear compressed portions that extend along the longitudinal direction in a plan view, and are provided in pairs at a predetermined interval in the width direction. The absorbent body 10 has a plurality of circular compressed portions ee at a central portion in the width direction and at a position overlapping with the crotch region CA in the longitudinal direction. The circular compressed portions ee are compressed portions that are circular in plan view and are formed by compressing at least a portion of the top sheet 21, the second sheet 22, and the absorbent body 10 in the thickness direction.

[0062] Because the linear compressed portions EL and circular compressed portions ee are formed by compressing members stacked in the thickness direction, the fiber density of each member in each compressed portion is higher than the fiber density of portions where no compressed portions are provided. The linear compressed portions EL and circular compressed portions ee are formed, for example, by passing the napkin 1 in the manufacturing process through a roll nip between a convex roller having multiple convex portions and an anvil roller with a flat surface, thereby squeezing the napkin.

[0063] <<<<Diffusion of Excrement in the Napkin 1 >>>> When an absorbent article such as the napkin 1 is worn, it is preferable that the absorbent article quickly absorbs excrement, such as menstrual blood, excreted from the wearer's vaginal opening and diffuses it over a wide area within the absorbent article, thereby preventing the excrement from remaining on the skin-facing side of the absorbent article and reducing adverse effects on the wearer's skin and discomfort. In particular, sanitary napkins are required to absorb highly viscous excrement, such as menstrual blood, and therefore are required to be able to absorb and diffuse excrement. For this reason, methods have been known in the past to provide absorbent articles with substances that promote the diffusion of excrement. However, the use of substances that promote the diffusion of excrement has been known to excessively promote the diffusion of excrement within the absorbent article, resulting in the risk of excrement leaking from the absorbent article.

[0064] The napkin 1 of the present invention is provided with an oil agent Y that promotes the diffusion of bodily waste in the absorbent core 11. The absorbent core 11 of the napkin 1 contains pulverized fibers including broadleaf fiber made from broadleaf trees. When the absorbent core 11 is divided into thirds in either the longitudinal or transverse direction, it has, in order from one side, one side, a central portion, and another side portion, and the basis weight of the oil agent Y provided in the central portion is higher than the basis weight of the oil agent Y provided in the one side portion.

[0065] In the napkin 1 of this embodiment, oil Y is applied to region Y11 in Fig. 1 from the skin side of the top sheet 21. Fig. 8 is a schematic plan view illustrating the region where oil Y is provided. Fig. 9 is a schematic cross-sectional view illustrating the region where oil Y is provided. Note that Figs. 8 and 9 are schematic views, and for convenience, some components are omitted or simplified. In Fig. 8 and other figures, the region where oil Y is provided on the napkin 1 is shown, with region Y11 being the region in the absorbent core 11 where oil Y is provided (hereinafter, region Y11 will also be referred to as the "core oil-agent-present region Y11") and region Y21 being the region in the top sheet 21 where oil Y is provided (hereinafter, region Y21 will also be referred to as the "surface oil-agent-present region Y21"). In addition, in Figure 9, the area where oil agent Y is applied is shown by the diagonally downward-slanting left-hand area, but Figure 9 illustrates the planar arrangement of oil agent Y, and oil agent Y is not necessarily applied over the entire thickness direction of each component. For example, oil agent Y may be applied only to the skin-facing portion of the absorbent core 11, and oil agent Y may not be applied to the non-skin-facing portion of the absorbent core 11.

[0066] As shown in Fig. 8, when the absorbent core 11 is divided into thirds in the longitudinal direction of the napkin 1, from the front side (one side) in the longitudinal direction, there are a front side portion (one side portion) Ta, a central portion Tb, and a rear side portion (other side portion) Tc. The napkin 1 is characterized in that the basis weight (weight of oil agent Y per unit area) of the oil agent Y applied to the central portion Tb is higher than the basis weight of the oil agent applied to the front side portion Ta. Alternatively, a napkin 1 having an absorbent core 11 comprising hardwood fibers and oil agent Y, as shown in Fig. 8, when the absorbent core 11 is divided into thirds in the width direction of the napkin 1, there are, from one side, a left side portion (one side portion) Wa, a central portion Wb, and a right side portion (other side portion) Wec. The napkin 1 is characterized in that the basis weight of the oil agent Y applied to the central portion Wb is higher than the basis weight of the oil agent applied to the left side portion Wa. The left side Wa of the napkin 1 corresponds to the left side of the wearer when worn, and is the left side in FIG.

[0067] In Fig. 8, the front side portion Ta in the longitudinal direction is one side portion and the rear side portion Tc is the other side portion, but this is not limited to this. The front side portion Ta and the other side portion may be defined as one side portion, and the rear side portion Tc may be defined as one side portion. Similarly, the left side portion Wa in the width direction is defined as one side portion and the right side portion Wc is defined as the other side portion, but this is not limited to this. The left side portion Wa may be defined as the other side portion and the right side portion Wc may be defined as one side portion.

[0068] The region Y11 of the absorbent core 11 of the napkin 1 of this embodiment, where the oil agent Y is provided, is located approximately in the center of the napkin 1. Specifically, in the longitudinal direction, most of the region Y11 is located in the longitudinal center portion Tb, and part of the oil agent Y is located in the longitudinal front portion Ta. No oil agent Y is provided in the longitudinal rear portion Tc. In the longitudinal direction, the basis weight of the oil agent Y provided in the longitudinal center portion Tb (weight of oil agent Y in the longitudinal center portion Tb / area of ​​the longitudinal center portion Tb) is greater than the basis weight of the oil agent Y provided in the longitudinal front portion Ta (weight of oil agent Y in the longitudinal front portion Ta / area of ​​the longitudinal front portion Ta). Furthermore, in the longitudinal direction, the basis weight of the oil agent Y provided in the central portion Tb (weight of oil agent Y in the central portion Tb / area of ​​the central portion Tb) is greater than the basis weight of the oil agent Y provided in the rear portion Tc (weight of oil agent Y in the rear portion Tc / area of ​​the rear portion Tc). In the width direction, most of the region Y11 is provided in the central portion Wb in the width direction, with a portion of the oil agent Y provided in the left portion Wa in the width direction and a portion of the oil agent Y provided in the right portion Wc in the width direction. In the width direction, the basis weight of the oil agent Y provided in the central portion Wb (weight of oil agent Y in the central portion Wb / area of ​​the central portion Wb) is greater than the basis weight of the oil agent Y provided in the left portion Wa (weight of oil agent Y in the left portion Wa / area of ​​the left portion Wa). In addition, in the width direction, the basis weight of the oil agent Y provided in the central portion Wb (weight of oil agent Y in the central portion Wb / area of ​​the central portion Wb) is larger than the basis weight of the oil agent Y provided in the right side portion Wc (weight of oil agent Y in the right side portion Wc / area of ​​the right side portion Wc).

[0069] In the napkin 1, by making the basis weight of the oil agent Y in the center in either the longitudinal or width direction of the absorbent core 11 higher than the basis weight of the oil agent Y in one side, the diffusion of body waste is more easily promoted in the center of the absorbent core 11 than in the one side. Also, by making the basis weight of the oil agent Y in one side in either the longitudinal or width direction lower than the basis weight of the oil agent Y in the center, the diffusion of body waste is more easily suppressed in the one side of the absorbent core 11 than in the center. Also, fibers made from hardwoods are generally characterized by having shorter fiber lengths than softwood fibers. Within the absorbent core 11, the longer the fiber length, the more easily diffusion is promoted. Therefore, by including hardwood fibers as the pulverized fibers of the absorbent core 11, the diffusion of body waste in the one side, where the basis weight of the oil agent Y is lower, is more easily suppressed. Furthermore, even when the absorbent core 11 contains hardwood fibers as the pulverized fibers, by making the basis weight of the oil agent in the center in either the longitudinal or width direction higher than the basis weight of the oil agent Y in one side portion, it becomes easier to promote the diffusion of body waste in the center of the absorbent core 11, thereby reducing the risk of body waste remaining on the surface of the absorbent article when worn. This promotes the diffusion of body waste in the center of the absorbent core 11 of the napkin 1, making it less likely for body waste to remain on the skin-side surface of the absorbent core 11, thereby reducing adverse effects on the wearer's skin and discomfort, and reducing the risk of body waste folding outward from one end in the longitudinal or width direction of the napkin 1. Furthermore, when wearing the napkin 1, the wearer can visually confirm that body waste is easily diffused in the center of the absorbent core 11 and that body waste is difficult to diffuse at one side in the longitudinal or width direction, which makes it easier to alleviate the wearer's concerns about the possibility of body waste leaking from the napkin 1.

[0070] Examples of comminuted fibers include pulp, for example, wood pulp obtained from softwood (e.g., southern yellow pine) or hardwood (e.g., eucalyptus) as raw materials, non-wood pulp such as bagasse, kenaf, bamboo, hemp, and cotton (e.g., cotton linter), regenerated cellulose fibers such as rayon fibers, and semi-synthetic fibers such as acetate fibers. Softwood fibers (softwood pulp), which have relatively long fiber lengths, are often used in absorbent articles.

[0071] The average fiber length of softwood fibers (softwood pulp) is 2.5 mm, while the average fiber length of hardwood fibers (hardwood pulp) is 0.79 mm. In other words, the average fiber length of hardwood fibers is shorter than the average fiber length of softwood fibers. Hardwood fibers used as pulverized fibers in the absorbent core 11 are less likely to promote the diffusion of excrement (liquid) than softwood fibers. Therefore, by providing oil agent Y in the center in the longitudinal or width direction of the absorbent core 11 containing hardwood fibers to promote diffusion, the diffusion of excrement can be more easily suppressed in one side in the longitudinal or width direction where the basis weight of oil agent Y is low, thereby reducing leakage of excrement.

[0072] The pulverized fibers of the absorbent core 11 of this embodiment are composed solely of hardwood fibers (hardwood pulp). In other words, all of the pulverized fibers in the absorbent core 11 are hardwood fibers (100% hardwood fibers). As a result, the oil agent Y promotes the diffusion of excrement in the longitudinal center or width center of the absorbent core 11, while one longitudinal side or one width side is an area of ​​oil agent Y with a low basis weight and is made of hardwood fibers with a short average fiber length, which makes it easier to suppress the diffusion of excrement in that longitudinal side or one width side.

[0073] The pulverized fibers of the absorbent core 11 may contain softwood fibers (softwood pulp) made from softwood trees in addition to hardwood pulp. When the absorbent core 11 contains softwood fibers, it is preferable that the total weight of the hardwood fibers is greater than the total weight of the softwood fibers. By including a large amount of hardwood fibers with a short average fiber length in the absorbent core 11, it becomes easier to promote the absorption of bodily waste by the oil agent Y in the central portion of the absorbent core 11 in the longitudinal or width direction, while also making it easier to suppress the diffusion of bodily waste at one side portion of the absorbent core 11 in the longitudinal or width direction.

[0074] The presence of hardwood fibers in the pulverized fibers of the absorbent core 11 can be confirmed by well-known methods. For example, this can be done by the following method. First, a predetermined weight (0.04 g) of pulverized fibers from the absorbent core 11 of the napkin 1 is taken as a sample, and the pulverized fibers are hydrolyzed with water (distilled water). Next, the sample is transferred to a beaker, and an image is taken using a fiber length distribution measuring device ("Valmet FS5" manufactured by Valmet Co., Ltd.) to measure the fiber length. The concentration of the sample is automatically adjusted to 15 to 23 mmg / L in this device. The presence of hardwood fibers in the sample can be confirmed by comparing the obtained fiber length with the average fiber length of hardwood fibers.

[0075] It is preferable that 50% or more of the pulverized fibers in the absorbent core 11 have a fiber length of 1 mm or less on a length-weighted average basis. The absorbent core 11 contains a large amount of short fibers, which makes it difficult for planar diffusion of excrement along the fibers in the absorbent core 11 to occur. This facilitates vertical migration of excrement from the skin side to the non-skin side of the absorbent core 11, thereby reducing the risk of excrement leaking outside the napkin 1.

[0076] The oil agent Y is a substance that promotes the diffusion of excrement (liquid), and is preferably an amphipathic substance. When the oil agent Y is an amphipathic substance that has both hydrophilic and hydrophobic groups, the oil agent Y changes the surface tension of the excrement when it comes into contact with the excrement during wear, making it easier to promote the diffusion of the excrement (liquid) in the area where the oil agent Y is applied.

[0077] As the oil agent Y, for example, the following can be used: [Ester of chain hydrocarbon tetraol and at least one fatty acid] Unistar H-408BRS, manufactured by NOF Corporation, pentaerythritol tetra-2-ethylhexanoate, weight average molecular weight: about 640 Unistar H-2408BRS-22, manufactured by NOF Corporation, mixture of pentaerythritol tetra-2-ethylhexanoate and neopentyl glycol di-2-ethylhexanoate (58:42, weight ratio), weight average molecular weight: about 520

[0078] [Esters of linear hydrocarbon triol and at least one fatty acid] Tri-C2L oil fatty acid glyceride, manufactured by NOF Corporation, a triester of glycerin and fatty acids containing C8 fatty acids, C10 fatty acids, and C12 fatty acids in a weight ratio of approximately 37:7:56, weight average molecular weight: approximately 570 Tri-CL oil fatty acid glyceride, manufactured by NOF Corporation, a triester of glycerin and fatty acids containing C8 fatty acids, C12 fatty acids in a weight ratio of approximately 44:56, weight average molecular weight: approximately 570 Panasate 810s, manufactured by NOF Corporation, a triester of glycerin and fatty acids containing C8 fatty acids, C10 fatty acids in a weight ratio of approximately 85:15, weight average molecular weight: approximately 480 Panasate 800, manufactured by NOF Corporation, a triester of glycerin and fatty acids in which all the fatty acids are octanoic acid (C8), weight average molecular weight: approximately 470 PANACET 800B, manufactured by NOF Corporation: A triester of glycerin and fatty acids, all of which are 2-ethylhexanoic acid (C8), with a weight-average molecular weight of approximately 470. NA36, manufactured by NOF Corporation: A triester of glycerin and fatty acids, containing C16 fatty acids, C18 fatty acids, and C20 fatty acids (including both saturated and unsaturated fatty acids) in a weight ratio of approximately 5:92:3, with a weight-average molecular weight of approximately 880. Tri-coconut fatty acid glyceride, manufactured by NOF Corporation: A triester of glycerin and fatty acids, containing C8 fatty acids, C10 fatty acids, C12 fatty acids, C14 fatty acids, and C16 fatty acids (including both saturated and unsaturated fatty acids) in a weight ratio of approximately 4:8:60:25:3, with a weight-average molecular weight of 670. Caprylic acid diglyceride, manufactured by NOF Corporation. Diester of glycerin and fatty acid, where the fatty acid is octanoic acid, Weight average molecular weight: 340

[0079] [Esters of linear hydrocarbon diol and at least one fatty acid] Unistar H-208BRS, manufactured by NOF Corporation, neopentyl glycol di-2-ethylhexanoate, weight average molecular weight: about 360 Compol BL, manufactured by NOF Corporation, dodecanoic acid (C12) monoester of butylene glycol, weight average molecular weight: about 270 Compol BS, manufactured by NOF Corporation, octadecanoic acid (C18) monoester of butylene glycol, weight average molecular weight: about 350

[0080] [Compounds having a chain hydrocarbon moiety and 2 to 4 hydroxyl groups substituting hydrogen atoms of the chain hydrocarbon moiety]

[0081] [Ethers of a compound having a chain hydrocarbon moiety and one hydroxyl group substituting a hydrogen atom of the chain hydrocarbon moiety]

[0082] [Carboxylic acid, hydroxy acid, alkoxy acid or oxo acid containing a chain hydrocarbon moiety and 2 to 4 carboxyl groups substituting hydrogen atoms of the chain hydrocarbon moiety]

[0083] [Esters of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having three carboxyl groups and at least one aliphatic monohydric alcohol] O-acetyl tributyl citrate, manufactured by Tokyo Chemical Industry Co., Ltd. Weight average molecular weight: about 400 Tributyl citrate, manufactured by Tokyo Chemical Industry Co., Ltd. Weight average molecular weight: about 360

[0084] [Ester of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid, or oxo acid having two carboxyl groups and at least one aliphatic monohydric alcohol] Dioctyl adipate, manufactured by Wako Pure Chemical Industries, Ltd. Weight average molecular weight: about 380

[0085] [A compound having a chain hydrocarbon portion and any one bond selected from the group consisting of an ether bond (—O—), a carbonyl bond (—CO—), an ester bond (—COO—), and a carbonate bond (—OCOO—) inserted between the C-C single bonds of the chain hydrocarbon portion]

[0086] [Esters of fatty acids and aliphatic monohydric alcohols] Electol WE20, manufactured by NOF Corporation, ester of dodecanoic acid (C12) and dodecyl alcohol (C12), weight average molecular weight: about 360 Electol WE40, manufactured by NOF Corporation, ester of tetradecanoic acid (C14) and dodecyl alcohol (C12), weight average molecular weight: about 390

[0087] [Polyoxy C3-C6 alkylene glycol, or its alkyl ester or alkyl ether]

[0088] [Polyoxy C3-C6 alkylene glycol] Uniol PB500, manufactured by NOF Corporation, polybutylene glycol, weight average molecular weight: about 500 Uniol PB700, manufactured by NOF Corporation, polyoxybutylene polyoxypropylene glycol, weight average molecular weight: about 700

[0089] [Chain hydrocarbons] Parleam 6, manufactured by NOF Corporation: A branched hydrocarbon produced by copolymerizing liquid isoparaffin, isobutene, and n-butene, followed by addition of hydrogen, degree of polymerization: about 5 to about 10, weight average molecular weight: about 330

[0090] [Others] NA50, manufactured by NOF Corporation: A triester of glycerin and fatty acids, obtained by adding hydrogen to NA36 to reduce the ratio of double bonds derived from the raw unsaturated fatty acids; weight-average molecular weight: approximately 880. Caprylic / capric monoglyceride, manufactured by NOF Corporation: A monoester of glycerin and fatty acids, containing octanoic acid (C8) and decanoic acid (C10) in a weight ratio of approximately 85:15; weight-average molecular weight: approximately 220. Monomuls 90-L2 lauric acid monoglyceride, manufactured by Cognis Japan Co., Ltd. Isopropyl citrate, manufactured by Tokyo Chemical Industry Co., Ltd. Weight-average molecular weight: approximately 230. Diisostearyl malate Weight-average molecular weight: approximately 640. Uniol PB1000R, manufactured by NOF Corporation: Polybutylene glycol; weight-average molecular weight: approximately 1,000. Uniol D-250, manufactured by NOF Corporation. Polypropylene glycol, weight average molecular weight: about 250; Uniol D-400, manufactured by NOF Corporation; Polypropylene glycol, weight average molecular weight: about 400; Uniol D-700, manufactured by NOF Corporation; Polypropylene glycol, weight average molecular weight: about 700; Uniol D-1000, manufactured by NOF Corporation; Polypropylene glycol, weight average molecular weight: about 1,000; Uniol D-1200, manufactured by NOF Corporation; Polypropylene glycol, weight average molecular weight: about 1,160; Uniol D-2000, manufactured by NOF Corporation; Polypropylene glycol, weight average molecular weight: about 2,030; Uniol D-3000, manufactured by NOF Corporation; Polypropylene glycol, weight average molecular weight: about 3,000; Uniol D-4000, manufactured by NOF Corporation; Polypropylene glycol, weight average molecular weight: about 4,000; PEG1500, manufactured by NOF Corporation; Polyethylene glycol, weight average molecular weight: about 1,500 to about 1,600 Wilbrite CP9, manufactured by NOF Corporation. A compound in which the OH groups at both ends of polybutylene glycol are esterified with hexadecanoic acid (C16). Weight average molecular weight: about 1,150. Unilube MS-70K, manufactured by NOF Corporation. Stearyl ether of polypropylene glycol. Approximately 15 repeating units. Weight average molecular weight: about 1,140. Nonion S-6.Polyoxyethylene monostearate, manufactured by NOF Corporation, approximately 7 repeating units, weight average molecular weight: approximately 880. Unilube 5TP-300KB: Polyoxyethylene polyoxypropylene pentaerythritol ether produced by adding 5 moles of ethylene oxide and 65 moles of propylene oxide to 1 mole of pentaerythritol, weight average molecular weight: 4,130. Wilbrite s753, manufactured by NOF Corporation: Polyoxyethylene polyoxypropylene polyoxybutylene glycerin, weight average molecular weight: approximately 960. Uniol TG-330, manufactured by NOF Corporation: Glyceryl ether of polypropylene glycol, approximately 6 repeating units, weight average molecular weight: approximately 330. Uniol TG-1000, manufactured by NOF Corporation: Glyceryl ether of polypropylene glycol, approximately 16 repeating units, weight average molecular weight: approximately 1,000. Uniol TG-3000, manufactured by NOF Corporation. Glyceryl ether of polypropylene glycol, about 16 repeating units, weight average molecular weight: about 3,000; Uniol TG-4000, manufactured by NOF Corporation; Glyceryl ether of polypropylene glycol, about 16 repeating units, weight average molecular weight: about 4,000; Unilube DGP-700, manufactured by NOF Corporation; Diglyceryl ether of polypropylene glycol, about 9 repeating units, weight average molecular weight: about 700; Uniox HC60, manufactured by NOF Corporation; Polyoxyethylene hydrogenated castor oil, weight average molecular weight: about 3,570; Vaseline, manufactured by Cognis Japan Co., Ltd.; Petroleum-derived hydrocarbon, semi-solid,

[0091] Comparison of the basis weights of the oil agent Y can be performed using known methods. For example, a reagent corresponding to the oil agent Y used can be applied and compared based on color change or shade. The napkin 1 of this embodiment uses Panasate 810S (triglyceride, manufactured by NOF Corporation) as the oil agent Y. This oil agent Y is an oil agent containing unsaturated fatty acids, and can promote excretion, provide unsaturated fatty acids to the wearer's skin to improve feel, and protect the wearer's skin. The presence and basis weight of this oil agent Y can be compared using the oil leak coloring test agent "Moremir OiL (manufactured by Taseto Co., Ltd.)." Specifically, the absorbent core 11 is removed from the napkin 1, and the above-mentioned oil leak coloring test agent is sprayed over the entire absorbent core 11. When the oil leak coloring test agent is applied, the areas where oil (oil agent Y) is present turn red. In the areas that are not colored red, no oil agent Y has been applied, and the basis weight of the oil agent Y is 0 (zero). On the other hand, by comparing the shade of red in the areas that are colored red, it is possible to compare the basis weight of the oil agent Y in each part.

[0092] In the napkin 1 of this embodiment, the basis weight of the oil agent Y applied to the central portion in the longitudinal and width directions is higher than the basis weight of the oil agent Y applied to one side portion. That is, the basis weight of the oil agent Y applied to the central portion Tb is higher than the basis weight of the oil agent applied to the front portion Ta, and the basis weight of the oil agent Y applied to the central portion Wb is higher than the basis weight of the oil agent applied to the left portion Wa. As a result, the central portion of the absorbent core 11 in the longitudinal and width directions (the portion that is both the central portion Tb and the central portion Wb) is the portion that is likely to come into contact with the wearer's excretory opening, such as the vaginal opening, when worn. Therefore, the higher basis weight of the oil agent Y in this central portion in the longitudinal and width directions of the absorbent core 11 facilitates the rapid absorption and diffusion of excrement excreted when worn. On the other hand, by making it easier to suppress diffusion of one side portion Ta, Wa of the absorbent core 11 in the longitudinal and width directions, the risk of excrement leaking from the outside of the front side (one side) of the napkin 1 in the longitudinal direction and the outside of the left side (one side) of the width direction can be reduced.

[0093] Furthermore, it is preferable that the outer end of the longitudinal front portion (one side portion) Ta of the absorbent core 11 and the outer end of the widthwise left portion (one side portion) Wa of the absorbent core 11 are free of oil agent Y. This makes it easier to suppress the diffusion of excrement at the outer end of the longitudinal front portion (one side portion) Ta of the absorbent core 11 and the outer end of the widthwise left portion (one side portion) Wa of the absorbent core 11, thereby reducing the risk of excrement leaking from the outside of the longitudinal front side (one side) and the outside of the widthwise left side (one side) of the napkin 1. The outer end of the longitudinal front portion (one side portion) Ta of the absorbent core 11 is a portion 10 mm long from the longitudinal front end of the absorbent core 11, more preferably a portion 5 mm long from the front end. The outer end of the widthwise left portion (one side portion) Wa of the absorbent core 11 is a portion 10 mm long from the left end of the absorbent core 11, more preferably a portion 5 mm long from the left end.

[0094] Furthermore, it is preferable that the napkin 1 has compressed lines (compressed sections) EL formed by compressing the absorbent core 11 in the thickness direction. As described above, the compressed lines EL of the napkin 1 include a rear compressed section ELb located rearward of the longitudinal centerline CL (FIG. 1). In such a case, it is preferable that the rear end of the region (region Y11) where the oil agent Y is provided is located forward of the front end of the rear compressed section ELb. The compressed lines EL and the rear compressed section ELb have a higher fiber density than the surrounding areas, and are areas that are likely to promote the diffusion of bodily exudates due to capillary action. Therefore, by providing the oil agent Y forward of the front end of the rear compressed section ELb, it is possible to more easily suppress diffusion behind the absorbent core 11 and reduce the risk of bodily exudates leaking outside the rear side of the napkin 1.

[0095] As described above, the absorbent core 11 is covered with a core wrap sheet 12. The average fiber length of the fibers in the skin-side portion 12a (core wrap sheet) of the core wrap sheet 12, which is located closer to the skin than the absorbent core 11, is preferably equal to or greater than the average fiber length of the pulverized fibers in the absorbent core 11. This facilitates the absorption and diffusion of excrement in the skin-side portion 12a during wear, compared to when the average fiber length of the fibers in the skin-side portion 12a is shorter than the average fiber length of the pulverized fibers in the absorbent core 11. Therefore, by spreading the excrement planarly in the skin-side portion 12a and then vertically transferring the excrement to the absorbent core 11, which is located closer to the skin than the skin-side portion 12a, the excrement can be more easily penetrated into the absorbent core 11. The average fiber length of the pulverized fibers in the absorbent core 11 and the average fiber length of the fibers in the skin side portion 12a can be measured by a known method, for example, by taking an image using the above-mentioned fiber length distribution measuring device ("Valmet FS5" manufactured by Valmet Co., Ltd.) and measuring the fiber length.

[0096] The fibers of the skin-side portion 12a (core wrap sheet) can be extracted, for example, by the following method. First, the napkin 1 is decomposed using toluene to extract the core wrap sheet 12. The extracted core wrap sheet is dried. Next, 15 g of the core wrap sheet and approximately 1.5 L of water (adjusted to a concentration of 1% relative to the weight of the core wrap sheet) are placed in a plastic container (inner diameter: 120 mm, height: 220 mm) and stirred at room temperature for approximately 24 hours using a stirrer (EYELA MAZELA Z, manufactured by Tokyo Rikakikai Co., Ltd.). Stirring is performed slowly so as not to break the fibers. The fibers dispersed in the water are then sucked up together with the water using a dropper (hole diameter: 2-3 mm). The extracted fibers are collected by suction filtration and dried. The fiber lengths of the extracted fibers are measured using an electron microscope, and the average fiber length is calculated from the measured fiber lengths.

[0097] With respect to the skin-side portion (core wrap sheet) 12a of the core wrap sheet 12 located closer to the skin than the absorbent core 11 (FIG. 6), it is preferable that no adhesive be provided between the skin-side surface of the absorbent core 11 and the non-skin-side surface of the skin-side portion 12a. In other words, it is preferable that the skin-side surface of the absorbent core 11 and the skin-side portion 12a are not bonded with an adhesive. The oil agent Y, which promotes excretion, is likely to blend not only with the excreta but also with the adhesive. If adhesive were provided between the skin-side surface of the absorbent core 11 and the non-skin-side surface of the skin-side portion 12a, the oil agent Y would blend with the adhesive in the skin-side portion 12a before the napkin 1 is worn (before excreta is absorbed), causing the oil agent Y to spread to unintended areas in the skin-side portion 12a. As a result, when the napkin 1 is worn, if excrement is absorbed, the excrement that has spread in a plane in the skin-side portion 12a moves toward the non-skin side toward the absorbent core 11, causing excessive spreading over a wide area within the absorbent core 11, which may result in leakage of the excrement from the napkin 1. In contrast, by not providing an adhesive between the skin-side portion of the absorbent core 11 and the non-skin side of the skin-side portion 12a, the oil agent Y is prevented from blending with the adhesive in the skin-side portion 12a, thereby reducing the risk of excessive spreading of the excrement in the absorbent core 11 when worn and reducing the risk of excrement leaking outside the napkin 1.

[0098] With respect to the absorbent core 11 and the core wrap sheet 12, it is preferable that no adhesive be provided between the non-skin side of the absorbent core 11 and the non-skin side portion (core wrap sheet) 12b located on the non-skin side of the absorbent core 11. In other words, it is preferable that the non-skin side of the absorbent core 11 and the non-skin side portion 12b are not bonded with an adhesive. As with the skin side (skin side portion 12a), the oil agent Y and the adhesive blend well on the non-skin side of the absorbent core 11, preventing the oil agent Y from spreading excessively in the non-skin side portion 12b. This reduces the risk of excrement spreading in a plane in the non-skin side portion 12b moving to the absorbent core 11 and spreading excessively over a wide area within the absorbent core 11. This reduces the risk of excrement leaking outside the napkin 1.

[0099] As shown in Figure 2 and other figures, the napkin 1 has a main adhesive portion 32 on the non-skin side of the back sheet 31, which is provided closest to the skin. The main adhesive portion 32 is provided to secure the napkin 1 to the wearer's clothing when worn. When viewed in the thickness direction, this napkin 1 has an overlapping region y32 where the main adhesive portion 32 overlaps with a portion of the absorbent core 11 where the oil agent Y is provided, and a non-overlapping region n32 where the main adhesive portion 32 overlaps with a portion of the absorbent core 11 where the oil agent Y is not provided. In the napkin 1 of this embodiment, as shown in Figure 2, a rectangular region Y11 is the region where the oil agent Y is provided on the absorbent core 11, and the main adhesive portion 32 provided inside region Y11 is the overlapping region y32. The main adhesive portion 32 provided outside region Y11 is the non-overlapping region n32. In such a case, it is preferable that the adhesive strength of the main body adhesive portion 32 in the overlapping region y32 be lower than the adhesive strength of the main body adhesive portion 32 in the non-overlapping region n32. Note that adhesive strength refers to the strength of the force required to secure the napkin 1 to clothing, and also the strength of the force required to peel off the napkin 1 secured to the napkin 1. Note that the main body adhesive portion 32 of the napkin 1 has five linear adhesive-applied regions (diagonally shaded areas slanting downward to the right in FIG. 2 ) arranged intermittently in the width direction on both left and right sides, but the spaces between the adhesive-applied regions essentially function as adhesive portions due to adhesive impregnation or the like. Therefore, the main body adhesive portion 32 of the napkin 1 is a rectangular region surrounded by the outer edges of the adhesive-applied regions provided on both left and right sides.

[0100] The overlap region y32 of the napkin 1 is a portion where the adhesive of the main adhesive portion 32 easily mixes with the oil agent Y, and mixing of the adhesive and oil agent Y easily reduces the adhesive strength. In particular, when a breathable film that is impermeable to liquids but allows gas to pass through is used as the backsheet 31, the oil agent Y provided on the absorbent core 11 easily passes through the backsheet 31 and mixes with the main adhesive portion 32. Therefore, by having the main adhesive portion 32 of the napkin 1 have parts with high adhesive strength and parts with low adhesive strength, it is possible to ensure the strength of attachment to clothing while reducing the risk of the adhesive strength becoming excessively strong. After use, the absorbent core 11 of the napkin 1, especially the part where the oil agent Y is provided, absorbs a lot of body fluid and is prone to wrinkling and crumbling. When removing the napkin 1 equipped with this absorbent core 11 from clothing, the napkin 1 can be removed from clothing with little force due to the provision of the overlapping region y32 with low adhesive strength, making it difficult for the absorbent core 11 to lose its shape in the overlapping region y32, making it easier to roll up the removed napkin 1 and dispose of it.

[0101] The adhesive strength of the main adhesive portion 32 in each region (overlapping region y32, non-overlapping region n32) can be measured by a known method. For example, the adhesive strength can be compared by measuring the force required to peel the main adhesive portion 32 using a peel test (JIS Z0237). Specifically, the overlapping region y32 and the non-overlapping region n32 of the napkin 1 are first cut into sample pieces of a predetermined size (10 mm x 10 mm). Each sample piece is then attached to a test plate, and the edges of the sample piece are grasped and peeled. The peel load is measured using a load cell. This measurement is performed multiple times for each sample. The adhesive strength of the main adhesive portion 32 [N / 10 mm] can be calculated by dividing the average peel load [N] obtained by the width of the sample piece (10 mm) and multiplying the result by 10. Adhesive strength [N / 10 mm] = (load [N] × 10) / (width of sample piece) The adhesive strengths of the sample pieces can be compared based on the calculated adhesive strength [N / 10 mm]. The test plate may be a SUS304 steel plate as specified in JIS Z0237, or a 100% cotton or 100% polyester sheet member fixed to a horizontal plate to simulate actual use.

[0102] The napkin 1 is distributed, sold, stored, etc., in a state where it is folded at one or more folds F. The folds F are fold lines along the width direction, and the napkin 1 has a front fold F1 in front of a center line CL in the longitudinal direction and a back fold F2 behind the center line CL. The napkin 1 is folded at the folds F1 and F2 with the skin-facing side facing inward. The napkin 1 shown in Figure 1 and other figures shows an unfolded state in which all folds F are unfolded. In the napkin 1 in this unfolded state, it is preferable that the oil agent Y is provided across the folds F in the longitudinal direction. Specifically, as shown in Figure 1, the region Y11 in which the oil agent Y is provided in the absorbent core 11 is provided across the front fold F1. In other words, the front fold F1 is provided at a position that overlaps the region Y11 in a plan view. The front folded portion F1 (folded portion F) tends to have a high fiber density in the absorbent core 11, and since the front folded portion F1 is aligned in the width direction, excrement that reaches the front folded portion F1 during wear tends to spread outward in the width direction along the front folded portion F1. Therefore, by providing region Y11, where oil agent Y is provided in the absorbent core 11, so that it straddles the front folded portion F1, even if excrement reaches the front folded portion F1 during wear, the oil agent Y in region Y11 tends to promote the diffusion of the excrement in the longitudinal direction. This reduces the risk of excrement leaking outward in the width direction of the napkin 1.

[0103] Furthermore, it is preferable that the weight per unit volume of the oil agent Y provided in the portion tu closer to the skin than the center 11c in the thickness direction of the absorbent core 11 is heavier than the weight per unit volume of the oil agent Y provided in the portion tb closer to the skin than the center 11c in the thickness direction of the absorbent core 11. In other words, more oil agent Y is provided on the skin side than on the non-skin side in the thickness direction of the absorbent core 11. This makes it easier to absorb and transfer excrement absorbed from the skin side of the napkin 1 to the non-skin side of the absorbent core 11 when worn.

[0104] As described above, the top sheet 21 of the napkin 1 is a sheet that can come into contact with the wearer's skin. Preferably, this top sheet 21 is also provided with oil agent Y, and the top sheet 21 has a region Y21 where oil agent Y is provided. Preferably, when viewed in the thickness direction, the basis weight of the oil agent Y provided in the portion of the top sheet 21 that overlaps with the longitudinal or widthwise central regions Tb, Wb is higher than the basis weight of the oil agent Y provided in the portion that overlaps with one longitudinal or widthwise side region Ta, Wa. In the napkin 1 of this embodiment, during the manufacturing process of the napkin 1, the oil agent Y is applied to the skin-facing side of the top sheet 21 while the top sheet 21 and absorbent body 10 are overlapped. The oil agent Y impregnated from the top sheet 21 is then retained in the absorbent core 11. In addition to the absorbent core 11, the top sheet 21 also contains an oil agent Y, and the basis weight of the oil agent Y provided in the portions of the top sheet 21 overlapping with the longitudinal or widthwise central regions Tb, Wb is higher than the basis weight of the oil agent Y provided in the portions overlapping with one of the longitudinal or widthwise side regions Ta, Wa, which facilitates the diffusion of excrement in the portions overlapping with the longitudinal or widthwise central regions Tb, Wb of the top sheet 21. As a result, after the excrement is diffused to a certain extent in the portions of the top sheet 21 overlapping with the longitudinal or widthwise central regions Tb, Wb in the thickness direction, the excrement is moved to the non-skin side, making it easier to absorb the excrement over a wide range of the longitudinal or widthwise central regions Tb, Wb of the absorbent core 11, and therefore the napkin 1 is more likely to accelerate the absorption of excrement. The oil agent Y facilitates the absorption of excrement in the central portions Tb, Wb of the absorbent core 11, while also making it easier to suppress the diffusion of excrement in one side portion Ta, Wa of the absorbent core 11 in the longitudinal or widthwise direction.

[0105] Furthermore, when an oil agent Y is provided on the top sheet 21 of the napkin 1, as shown in Figure 9, it is preferable that the widthwise length W21 of the top sheet 21 is longer than the widthwise length W11 of the absorbent core 11 (W21 > W11), and that the oil agent Y is not provided on the widthwise outer side of the absorbent core 11. This makes it easier to suppress the diffusion of excrement at the widthwise ends of the absorbent core 11, and reduces the risk of excrement leaking from the widthwise outer side of the napkin 1.

[0106] When oil agent Y is applied to the top sheet 21 of the napkin 1, it is preferable that the widthwise length W21 of the top sheet 21 is longer than the widthwise length W11 of the absorbent core 11 (W21 > W11), as shown in Figure 9. The absorbent core 11 has a core oil-agent-present region Y11 where oil agent Y is applied, and a core oil-agent-free region N11 where oil agent Y is not applied. The topsheet 21 has a surface oil-agent-present region Y21 where oil agent Y is applied, and a surface oil-agent-free region N21 where oil agent Y is not applied. In the thickness direction of the napkin 1, it is preferable that the napkin 1 has a first region R1 where the core oil-agent-present region Y11 and the surface oil-agent-present region Y21 overlap, a second region R2 where the core oil-agent-free region N11 and the surface oil-agent-present region Y21 overlap, and a third region R3 where the surface oil-agent-free region does not overlap with the absorbent core. 9, it is preferable that the first region R1, the second region R2, and the third region R3 are provided in this order from inside to outside in the width direction. This allows the first region R1 of the napkin 1 to promote the diffusion of excrement while the second and third regions R2 and R3 to suppress the diffusion of excrement when worn. This reduces the risk of excrement leaking outward in the width direction of the napkin 1.

[0107] Furthermore, it is preferable that the core oil-present region Y11 has a core oil-rich region Y11k in the first region R1 where the basis weight of the oil Y is higher than that of the surrounding area, and that the surface oil-present region Y21 has a surface oil-thin region Y21u in the first region R1 where the basis weight of the oil Y is lower than that of the surrounding area. In such a case, it is more preferable that the core oil-thick region Y11k and the surface oil-thin region Y21u have overlapping portions in the widthwise center and longitudinal center of the first region R1 when viewing the napkin 1 in the thickness direction.

[0108] The first region R1 of the top sheet 21, which can contact the wearer's skin, is a portion that is likely to come into contact with an excretory opening such as the vaginal opening when worn. Excretory openings such as the vaginal opening are particularly sensitive areas, and direct contact with the oil Y could irritate or have adverse effects. In particular, the absorbent core 11 of this embodiment has a high center portion 11d that protrudes toward the wearer's skin in the center in the longitudinal and width directions, making it more likely to come into contact with the wearer's excretory opening such as the vaginal opening. On the other hand, it is preferable that the top sheet 21 contains the oil Y, which promotes the penetration and diffusion of excrement within the top sheet 21, particularly in the first region R1 that overlaps with the core oil presence region Y11 in the thickness direction, and prevents excrement from flowing on the surface (skin-facing side) of the top sheet 21 and leaking from the napkin 1. Therefore, by having the top sheet 21 have the thin surface oil-agent region Y21u in the first region R1, the amount of oil Y provided in areas that may come into direct contact with the wearer's excretory opening is reduced, promoting penetration and diffusion of excrement within the top sheet 21 and reducing the risk of the oil Y irritating or having a negative effect on the wearer's excretory opening. Furthermore, by having the core-concentrated oil-agent region Y11k and the thin surface oil-agent region Y21u in the first region R1 in the thickness direction and having an overlapping portion between the core-concentrated oil-agent region Y11k and the thin surface oil-agent region Y21u in the thickness direction, excrement is more likely to migrate from the top sheet 21 to the non-skin side rather than diffusing within the top sheet 21, which promotes absorption and diffusion of excrement in the absorbent core 11 having the core-concentrated oil-agent region Y11k, which has a higher basis weight of oil Y than the surrounding area. This makes it easier to draw excrement into the absorbent core 11, reducing the risk of excrement diffusing and leaking on the surface of the napkin 1.

[0109] An absorbent article such as a napkin may be configured to have a post-disposal tab or a post-disposal tape. For example, as shown in Fig. 10, a napkin 100 may be a nighttime sanitary napkin and be equipped with a post-disposal tab 50. Fig. 10 is a plan view of the napkin 100 as seen from the non-skin side. With regard to the napkin 100, parts having the same configuration as the napkin 1 described above are assigned the same reference numerals and their description will be omitted.

[0110] The napkin 100 has a post-disposal tab 50 on the non-skin side of the napkin 100, i.e., the non-skin side of the backsheet 31. The post-disposal tab 50 is a member to be used after use of the napkin 100. The post-disposal tab 50 is a strip-shaped film member that has a fixed portion that is fixed to the backsheet 31 with an adhesive or the like, and a free portion that is not fixed to the backsheet 31. After use of the napkin 100, the napkin 100 in a rolled-up state is wrapped around the post-disposal tab 50 that is stretched in the longitudinal direction, and the post-disposal tab 50 is attached to the adhesive portion 32 of the main body of the napkin 100, making it easier to maintain the napkin 100 in a rolled-up state.

[0111] With regard to this post-disposal tab 50, it is preferable that the oil agent Y (region Y11) does not overlap the post-disposal tab 50 when viewed in the thickness direction of the napkin 100. After use, the absorbent core 11 of the napkin 100 is prone to losing its shape due to the diffusion of excrement by the oil agent Y. On the other hand, the portion of the absorbent core 11 that does not overlap with the oil agent Y (region Y11) when viewed in the thickness direction is less susceptible to diffusion of excrement by the oil agent Y than the portion that overlaps with the oil agent Y (region Y11), and therefore the shape of the absorbent core 11 is less likely to be distorted. Therefore, by providing the post-disposal tab 50 in the portion that does not overlap with the oil agent Y (region Y11) when viewed in the thickness direction, when the napkin 100 is rolled up and discarded after use, the absorbent core 11 can be easily rolled up without losing its shape.

[0112] Although the napkin 100 is provided with the post-treatment tab 50, this is not limiting. For example, if the absorbent article is a disposable diaper or a shorts-type napkin, a post-treatment tape may be provided to maintain the absorbent article in a rolled state after use. The post-treatment tape is a film member that is fixed to the absorbent article at one longitudinal end and has an adhesive portion at the other longitudinal end. By wrapping the absorbent article in a rolled state after use with the post-treatment tape and securing it with the adhesive portion at the other end of the post-treatment tape, it becomes easier to maintain the absorbent article in a rolled state. As with the post-treatment tab 50, it is preferable that the post-treatment tape be provided in an absorbent article in a position that does not overlap with the oil agent Y provided on the absorbent core 11 when viewed in the thickness direction.

[0113] ===Other Embodiments= ...

[0114] 1 napkin (absorbent article), 1W wing portion, 10 absorbent body, 11 absorbent core, 11d central height portion, 12 core wrap sheet, 12a skin side portion (core wrap sheet), 12b non-skin side portion (core wrap sheet), 14 central compressed portion, 15 absorbent body compressed portion, 21 top sheet (surface sheet), 22 second sheet, 23 side sheet, 24 reinforcing sheet, 31 back sheet (non-skin side sheet), 32 main body adhesive portion (adhesive portion), 33 wing adhesive portion, CA crotch region, ee circular compressed portion, EL linear compressed portion, Ta front side portion (one side portion), Tb central portion, Tc back side portion (other side portion), Wa left side portion (one side portion), Wb central portion, Wc right side portion (other side portion), Y oil agent, Y11 region (core oil present region), Y11k core oil thick region, N11 core oil absent region, Y21 region (surface oil present region), Y21u surface oil thin region, N21 surface oil absent region, R1 first region, R2 second region, R3 third region

Claims

1. An absorbent article having a longitudinal direction, a width direction, and a thickness direction that are perpendicular to each other, and an absorbent core having crushed fibers, wherein the crushed fibers include hardwood fibers made of hardwood, and the absorbent core is provided with an oil agent that promotes the diffusion of excrement. In either the longitudinal direction or the width direction, when the absorbent core is divided into three equal parts, it has a one-side portion, a central portion, and the other-side portion in order from one side, and the basis weight of the oil agent provided in the central portion is higher than the basis weight of the oil agent provided in the one-side portion. An absorbent article characterized by this.

2. The absorbent article according to claim 1, wherein the crushed fibers also include softwood fibers made of softwood, and the total weight of the hardwood fibers is greater than the total weight of the softwood fibers. An absorbent article characterized by this.

3. The absorbent article according to claim 1 or 2, having a surface sheet that can contact the wearer's skin, and the surface sheet is also provided with the oil agent. When viewed in the thickness direction, the basis weight of the oil agent provided in the portion of the surface sheet that overlaps the central portion is higher than the basis weight of the oil agent provided in the portion that overlaps the one-side portion. An absorbent article characterized by this.

4. The absorbent article according to claim 1 or 2, wherein the oil agent is an amphiphilic substance. An absorbent article characterized by this.

5. The absorbent article according to claim 1 or 2, having a core wrap sheet on the skin side of the absorbent core, and no adhesive is provided between the skin side surface of the absorbent core and the non-skin side surface of the core wrap sheet. An absorbent article characterized by this.

6. The absorbent article according to claim 1 or 2, having a core wrap sheet on the non-skin side of the absorbent core, and no adhesive is provided between the non-skin side surface of the absorbent core and the skin side surface of the core wrap sheet. An absorbent article characterized by this.

7. The absorbent article according to claim 1 or 2, having a post-treatment tab or a post-treatment tape on the non-skin side surface of the absorbent article, and when viewed in the thickness direction, the oil agent does not overlap with the post-treatment tab or the post-treatment tape. An absorbent article characterized by this.

8. The absorbent article according to claim 1 or 2, having a non-skin side sheet on the outermost non-skin side of the absorbent article, wherein an adhesive portion is provided on the non-skin side surface of the non-skin side sheet, and in a thickness direction view, there are an overlapping region where a portion provided with the sizing agent overlaps with the adhesive portion and a non-overlapping region where a portion not provided with the sizing agent overlaps with the adhesive portion, and the absorbent article is characterized in that an adhesive strength of the adhesive portion in the overlapping region is lower than an adhesive strength of the adhesive portion in the non-overlapping region.

9. The absorbent article according to claim 1 or 2, wherein the absorbent core has a core wrap sheet on the skin side of the absorbent core, and the absorbent article is characterized in that an average fiber length of fibers of the core wrap sheet is equal to or greater than an average fiber length of the crushed fibers of the absorbent core.

10. The absorbent article according to claim 1 or 2, wherein in a longitudinal direction and a width direction, a basis weight of the sizing agent provided in the central portion is higher than a basis weight of the sizing agent provided in the one side portion.

11. The absorbent article according to claim 10, wherein the sizing agent is not provided at an outer end portion of the one side portion.

12. The absorbent article according to claim 1 or 2, having a surface sheet capable of contacting the skin of a wearer, wherein the sizing agent is also provided on the surface sheet, a length of the surface sheet in the width direction is longer than a length of the absorbent core in the width direction, the absorbent core has a core sizing agent present region where the sizing agent is provided and a core sizing agent non-present region where the sizing agent is not provided, the surface sheet has a surface sizing agent present region where the sizing agent is provided and a surface sizing agent non-present region where the sizing agent is not provided, and in a thickness direction, there are a first region where the core sizing agent present region overlaps with the surface sizing agent present region, a second region where the core sizing agent non-present region overlaps with the surface sizing agent present region, and a third region where the surface sizing agent non-present region does not overlap with the absorbent core, and the absorbent article is characterized in that the first region, the second region, and the third region are provided in an order of the first region, the second region, and the third region from an inner side to an outer side in the width direction.

13. The absorbent article according to claim 12, wherein the core oil agent existing region has, in the first region, a core oil agent concentrated region where the basis weight of the oil agent is higher than that of the surroundings, the surface oil agent existing region has, in the first region, a surface oil agent thin region where the basis weight of the oil agent is lower than that of the surroundings, and in the thickness direction view, there is a portion where the core oil agent concentrated region and the surface oil agent thin region overlap at the central portion in the width direction and the central portion in the longitudinal direction of the first region. The absorbent article is characterized by this.

14. The absorbent article according to claim 1 or 2, having a surface sheet capable of contacting the skin of the wearer, the oil agent is also provided on the surface sheet, the length of the surface sheet in the width direction is longer than the length of the absorbent core in the width direction, and the oil agent is not provided outside the absorbent core in the width direction. The absorbent article is characterized by this.

15. The absorbent article according to claim 1 or 2, having a squeezing portion obtained by squeezing the absorbent core in the thickness direction, the squeezing portion includes a rear squeezing portion on the rear side of the center in the longitudinal direction of the absorbent article, and the rear end of the oil agent is provided on the front side of the front end of the rear squeezing portion. The absorbent article is characterized by this.

16. The absorbent article according to claim 1 or 2, wherein the weight per unit volume of the oil agent provided on the skin side from the center in the thickness direction of the absorbent core is heavier than the weight per unit volume of the oil agent provided on the non-skin side from the center in the thickness direction of the absorbent core. The absorbent article is characterized by this.

17. The absorbent article according to claim 1 or 2, having a folding portion along the width direction, and in the longitudinal direction, the oil agent is provided across the folding portion. The absorbent article is characterized by this.

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