Absorbent article

Abstract

To provide an absorbent article which suppresses diffusion of excrement in one side part in a longitudinal direction or in the width direction of the absorbent article, and reduces a possibility for the excrement to leak outside from the end on one side in the longitudinal direction or width direction of the absorbent article.SOLUTION: An absorbent article (1) includes an absorbent core (11) which has a longitudinal direction, a width direction and a thickness direction orthogonal to one another and has pulverized fiber. The pulverized fiber includes broadleaf tree fiber composed of broadleaf trees, the absorbent core (11) is provided with oil solution (Y) promoting diffusion of excrement, has a one side part, a central part, and the other side part in order from the one side when the absorbent core (11) is divided into three in the longitudinal or the width direction. Basis weight of the oil solution (Y) provided in the central part is larger than basis weight of the oil solution provided for the one side part.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to absorbent articles.

Background Art

[0002] Absorbent articles such as sanitary napkins that absorb excrement are known. When worn, it is preferable that the absorbent article quickly absorbs excrement when excrement such as menstrual blood is discharged. For example, Patent Document 1 discloses a sanitary napkin having a topsheet that contacts the skin of the wearer and an absorber on the non-skin side of the topsheet. In order to promote the absorption of excrement such as menstrual blood with high viscosity during wearing, a blood lubricity-imparting agent is provided on the topsheet, so that the discharged excrement can be easily transferred from the topsheet to the absorber, and the sticky feeling on the skin side surface of the topsheet can be made less likely to be felt. A sanitary napkin is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the sanitary napkin described in Patent Document 1 promotes the absorption of excrement while excessively promoting the diffusion of excrement in the sanitary napkin, and there is a possibility that excrement may leak from the sanitary napkin.

[0005] The present invention has been made in view of the above conventional problems, and an object thereof is to suppress the diffusion of excrement in one side portion in the longitudinal direction or the width direction of the absorbent article, and to reduce the risk of excrement leaking outside the end on one side in the longitudinal direction or the width direction of the absorbent article. It is to provide an absorbent article.

Means for Solving the Problems

[0006] The main invention for achieving the above object is an absorbent article having a longitudinal direction, a width direction, and a thickness direction that are orthogonal 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. The absorbent article is characterized by this. Other features of the present invention will be clarified by the description in this specification and the attached drawings.

Effect of the Invention

[0007] According to the present invention, it is possible to suppress the diffusion of excrement in one-side portion in the longitudinal direction or the width direction of the absorbent article, and reduce the risk of excrement leaking outside from one end on one side in the longitudinal direction or the width direction of the absorbent article.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0009] From the description in this specification and the accompanying drawings, at least the following matters become clear. (Aspect 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. 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. The absorbent article is characterized by this.

[0010] According to Aspect 1, by making the basis weight of the oil agent provided in the central portion higher than the basis weight of the oil agent provided in the one-side portion in either the longitudinal direction or the width direction, it becomes easier to promote the diffusion in the central portion of the absorbent core by the oil agent. On the other hand, in the one-side portion of the absorbent core, while the absorbent core contains hardwood fibers, by making the basis weight of the oil agent provided in the one-side portion of the absorbent core lower than the basis weight of the oil agent provided in the central portion, the diffusion of excrement in the one-side portion in the longitudinal direction or the width direction of the absorbent core and the absorbent article is suppressed, and the risk of excrement leaking outside from one end on one side in the longitudinal direction or the width direction of the absorbent article can be reduced. Also, during wearing, by visually recognizing that excrement diffuses easily in the central portion of the absorbent core and is difficult to diffuse in the one-side portion in the longitudinal direction or the width direction, it becomes easier to reduce the wearer's concern that excrement may leak from the absorbent article.

[0011] (Aspect 2) The pulverized fibers include coniferous fibers made of coniferous trees, and in the absorbent article of Aspect 1, the total weight of the broad-leaved tree fibers is greater than the total weight of the coniferous tree fibers.

[0012] According to Aspect 2, the absorbent core contains a large amount of broad-leaved tree fibers with a short average fiber length, facilitating absorption in the central part of the absorbent core by an oil agent while making it easier to suppress the diffusion of excrement on one side in the longitudinal or width direction of the absorbent core.

[0013] (Aspect 3) It has a surface sheet that can contact the wearer's skin, and the oil agent is also provided on the surface sheet. In the thickness direction, the basis weight of the oil agent provided in the part overlapping the central part of the surface sheet is higher than the basis weight of the oil agent provided in the part overlapping the one side part, which is the absorbent article of Aspect 1 or 2.

[0014] According to Aspect 3, it is easier to promote absorption in the central part of the absorbent core by an oil agent while making it easier to suppress the diffusion of excrement on one side in the longitudinal or width direction of the absorbent core.

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

[0016] According to Aspect 4, it is easier to change the surface tension of excrement and easier to promote the diffusion of excrement in the absorbent core.

[0017] (Aspect 5) It has 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, which is the absorbent article of any one of Aspects 1 to 4.

[0018] According to Aspect 5, on the skin side of the absorbent core, the oil agent and the adhesive blend with each other and diffuse on the skin side of the core wrap sheet. The excrement is absorbed from the core wrap sheet into the absorbent core, reducing the risk of excessive diffusion in the absorbent core, and thus reducing the risk of excrement leaking outside the absorbent article.

[0019] (Aspect 6) The 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, on the non-skin side of the absorbent core, the oil agent and the adhesive blend with each other and diffuse on the skin side of the core wrap sheet. The excrement is absorbed from the core wrap sheet into the absorbent core, reducing the risk of excessive diffusion in the absorbent core, and thus reducing the risk of excrement leaking outside the absorbent article.

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

[0022] According to Aspect 7, since the shape of the absorbent core where the excrement has diffused due to the oil agent is likely to collapse, by providing a post-treatment tab or a post-treatment tape at a position that does not overlap with the oil agent in the thickness direction, the position that does not overlap with the oil agent in the thickness direction is a part where the shape of the absorbent core is less likely to collapse. Therefore, when the absorbent article is rolled up and discarded after use, it becomes easier to roll up the absorbent core while preventing the shape of the absorbent core from collapsing.

[0023] (Aspect 8) On the non-skin side of the absorbent article, there is a non-skin side sheet, and an adhesive portion is provided on the non-skin side surface of the non-skin side sheet. In the thickness direction, there is an overlapping region where the portion provided with the sizing agent overlaps with the adhesive portion, and a non-overlapping region where the portion not provided with the sizing agent overlaps with the adhesive portion. 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. The absorbent article is any one of Aspects 1 to 7, characterized by this.

[0024] The adhesive portion provided on the non-skin side of the absorbent article is provided to fix to the wearer's clothing during wearing. According to Aspect 8, it reduces the risk that the adhesive strength of the adhesive portion becomes excessively strong, and when removing the absorbent article from the clothing in the overlapping region that has become easy to wring out with a large amount of body fluid after use, it can be done with a small force. Therefore, the shape of the absorbent core in the overlapping region is less likely to collapse, and it can be easily discarded.

[0025] (Aspect 9) 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 ground fibers of the absorbent core. The absorbent article is any one of Aspects 1 to 8, characterized by this.

[0026] According to Aspect 9, during wearing, by promoting the absorption and diffusion of excrement in the core wrap sheet, it becomes easier to promote the penetration of excrement in the absorbent core located on the non-skin side.

[0027] (Aspect 10) In the longitudinal direction and the width direction, the basis weight of the sizing agent provided in the central portion is higher than the basis weight of the sizing agent provided in the one side portion. The absorbent article is any one of Aspects 1 to 9, characterized by this.

[0028] According to Aspect 10, while promoting the diffusion of excrement in the central portion in the longitudinal direction and the width direction of the absorbent core, it is possible to reduce the risk that excrement leaks from the outside of one side in the longitudinal direction and the width direction of the absorbent article.

[0029] (Aspect 11) The absorbent article according to aspect 10, wherein an outer end portion of the one side portion is not provided with the oil agent.

[0030] According to aspect 11, it becomes easier to suppress diffusion at an outer end portion of one side portion in the longitudinal direction and the width direction of the absorbent core, and it is possible to reduce the risk of excrement leaking from the outside of one side in the longitudinal direction and the width direction of the absorbent article.

[0031] (Aspect 12) It has a surface sheet capable of contacting the skin of the wearer, and the surface sheet is also provided with the oil agent. The length of the surface sheet in the width direction is longer than the length of the absorbent core in the width direction. The absorbent core has a core oil agent present region provided with the oil agent and a core oil agent non - present region not provided with the oil agent. The surface sheet has a surface oil agent present region provided with the oil agent and a surface oil agent non - present region not provided with the oil agent. In the thickness direction, there are 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 non - present region and the surface oil agent present region overlap, and a third region where the surface oil agent non - present region and the absorbent core do not overlap. The first region, the second region, and the third region are provided in the order of the first region, the second region, and the third region from the inner side to the outer side in the width direction, and it is an absorbent article according to any one of aspects 1 to 11.

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

[0033] (Aspect 13) The core oil agent existing region has a core oil agent concentrated region in the first region where the basis weight of the oil agent is higher than that of the surroundings, and the surface oil agent existing region has a surface oil agent thin region in the first region where the basis weight of the oil agent is lower than that of the surroundings. In the thickness direction, 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 according to Aspect 12 is characterized by this.

[0034] According to Aspect 13, during wearing, while reducing the risk that the oil agent will have an adverse effect on the wearer's excretory opening due to the surface oil agent thin region, it becomes easier to promote the penetration of excrement in the surface sheet in the surface oil agent existing region in the first region. Also, by having a core oil agent concentrated region that overlaps with the surface oil agent thin region in the thickness direction, in the thickness direction, the portion where the core oil agent concentrated region and the surface oil agent thin region overlap makes it easier to move excrement from the surface sheet to the absorbent core, and it is possible to reduce the risk that excrement will spread and leak on the skin-side surface of the absorbent article.

[0035] (Aspect 14) It has a surface sheet that can come into contact with the wearer's skin, and 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 according to any one of Aspects 1 to 13 is characterized by this.

[0036] According to Aspect 14, it is easy to suppress the diffusion at the end portion in the width direction of the absorbent core, and it is possible to reduce the risk that excrement will leak outside the absorbent article.

[0037] (Aspect 15) It has a squeezed portion obtained by squeezing the absorbent core in the thickness direction. The squeezed portion includes a rear-side squeezed portion behind the center in the longitudinal direction of the absorbent article, and the rear end of the oil agent is provided in front of the front end of the rear-side squeezed portion. The absorbent article according to any one of Aspects 1 to 14 is characterized by this.

[0038] According to Aspect 15, since the rear squeezing part with a high fiber density promotes diffusion easily by capillary action, by providing an oil agent on the front side of the front end of the rear squeezing part, it becomes easier to suppress the diffusion behind the absorbent core, and the risk of excrement leaking outside the absorbent article can be reduced.

[0039] (Aspect 16) The absorbent article according to any one of Aspects 1 to 15, wherein the weight per unit volume of the oil agent provided closer to the skin side than the center in the thickness direction of the absorbent core is heavier than the weight per unit volume of the oil agent provided closer to the non-skin side than the center in the thickness direction of the absorbent core.

[0040] According to Aspect 16, it becomes easier to absorb excrement absorbed from the skin side toward the non-skin side.

[0041] (Aspect 17) The absorbent article according to any one of Aspects 1 to 16, having a folded part along the width direction, wherein the oil agent is provided across the folded part in the longitudinal direction.

[0042] According to Aspect 17, the folded part is likely to have a high density of the absorbent core and is likely to promote diffusion in the width direction. However, since the oil agent straddles the folded part in the longitudinal direction, it becomes easier to promote diffusion in the longitudinal direction, and it becomes easier to reduce the risk of excrement leaking outside the width direction of the absorbent article.

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

[0044] <<<Configuration of Sanitary 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 line 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 abuts against the lower abdomen of the wearer is defined as the front side, and the side that abuts against the buttocks of the wearer is defined as the rear side. In the thickness direction, the side that abuts against the skin of the wearer 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 such as FIG. 3 schematically show the napkin 1, and the dimensions are not necessarily accurate.

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

[0046] The napkin 1 has a pair of wing portions 1W extending outward in the width direction at the central portion in the longitudinal direction. The wing portions 1W are mainly formed by the side sheets 23 and the backsheet 31. Note that a configuration not necessarily provided with the wing portions 1W may also be possible.

[0047] The topsheet 21 is a liquid-permeable sheet located on the skin side of the absorber 10. The topsheet 21 is a surface sheet that is located on the skin side of the absorber 10 and can abut against the skin of the wearer. Examples of the topsheet 21 include non-woven fabrics made of synthetic fibers such as polyethylene (PE) and polypropylene (PP) (for example, air-through non-woven fabrics and spunbond non-woven fabrics), synthetic resin films having through-holes, and flexible sheets such as non-woven fabric sheets made of cotton. The topsheet 21 of the present embodiment is formed of a liquid-permeable sheet of air-through non-woven fabric or spanlace non-woven fabric containing polyethylene terephthalate (PET) and polyethylene (PE), or water-retaining fibers such as cotton and rayon.

[0048] A 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 absorber 10, and are sheets that extend outward from both side portions in the width direction of the top sheet 21 and the like. Examples of the side sheet 23 include the same flexible liquid-permeable non-woven fabric as the top sheet 21, and a hydrophobic non-woven fabric. Further, on the outer side in the width direction of the top sheet 21, the second sheet 22, and the absorber 10, a reinforcing sheet 24 for reinforcing the strength of the side sheet 23 is provided between the side sheet 23 and the back sheet 31 in the thickness direction. As the reinforcing sheet 24, for example, a sheet member similar to the back sheet 31, or a sheet member such as paper or SMS can be used.

[0049] The back sheet (non-skin side sheet) 31 is located on the non-skin side of the absorber 10 and is the sheet provided on the outermost non-skin side of the napkin 1. Examples of the back sheet 31 include a liquid-impermeable sheet such as a resin film of polyethylene (PE). The shape of the back sheet 31 is substantially the same as the outer shape of the napkin 1.

[0050] A plurality of main body adhesion parts (adhesion parts) 32 are provided on the non-skin side surface of the back sheet 31. The main body adhesion part 32 of the present embodiment is an area where a plurality of strip-shaped hot melt adhesives are applied along the longitudinal direction. When the napkin 1 is worn, by attaching the main body adhesion part 32 to the inside of the crotch part of the underwear (clothing), the position of the napkin 1 can be prevented from shifting with respect to the wearer's body.

[0051] The wing part 1W is provided with a wing adhesion part 33 on the non-skin side surface of the back sheet 31. The wing adhesion part 33 of the present embodiment is an area where a rectangular hot melt adhesive is applied. When the napkin 1 is worn, the wing part 1W can be folded back to the non-skin side surface of the underwear, and the napkin 1 can be fixed to the underwear by attaching the wing adhesion part 33 to the non-skin side surface in the crotch part of the underwear.

[0052] The position that overlaps with the wing adhesive part 33 in the longitudinal direction (see Fig. 1) is the crotch region CA. The crotch region CA is a region that contacts the wearer's crotch in the longitudinal direction in the worn state, and is a region that contacts the blood drainage opening through which the wearer's excrement is discharged.

[0053] The absorber 10 has an absorbent core 11 and a core wrap sheet 12. The absorbent core 11 is formed by shaping liquid-absorbent fibers into a predetermined shape, and as the liquid-absorbent fibers, it has crushed fibers. The crushed fibers include hardwood fibers made of hardwood. The absorbent core 11 of the present embodiment contains crushed fibers (pulp fibers), and the crushed fibers are formed only of hardwood fibers (100% hardwood fibers). Note that the absorbent core 11 is not limited to only crushed fibers made of hardwood fibers, and the crushed fibers may include pulp fibers such as softwood fibers made of softwood in addition to hardwood fibers. The absorbent core 11 may also include liquid-absorbent fibers such as cellulose-based absorbent fibers, synthetic fibers made of polyolefin, polyester, acrylic, acrylate, etc., or a superabsorbent polymer (SAP). Fig. 4A is a plan view of the absorbent core 11. Fig. 4B is a schematic cross-sectional view taken along the line J-J in Fig. 4A. Fig. 5 is an enlarged schematic cross-sectional view taken along the line K-K in Fig. 4A. Fig. 6 is an enlarged view of the absorber 10 in Fig. 3. In addition, in Fig. 4A, Fig. 4B, and Fig. 5, the unevenness due to the squeezing part such as the squeezing part EL is omitted and shown.

[0054] The absorbent core 11 has a middle and higher portion 11d where the basis weight of the liquid-absorbent fibers is higher than that of the surroundings. The middle and higher portion 11d is a portion where the thickness of the absorbent core 11 is thicker (the length in the thickness direction is longer) than that of the surroundings. In the present embodiment, the middle and higher portion 11d is a portion protruding toward the skin side in the thickness direction and is a region having a substantially elliptical shape in plan view. By providing the middle and higher portion 11d at the central portion in the width direction of the absorbent core 11 and at a position overlapping the crotch region CA in plan view, in the worn state, it becomes easier to bring it into contact with the wearer's excretory opening, makes it easier to fit the napkin 1 to the wearer's body, and makes it easier to quickly absorb excreta. Further, by providing the middle and higher portion 11d having a high basis weight of the liquid-absorbent fibers at a position overlapping the crotch region CA in plan view, it becomes easier to hold the excreta discharged from the wearer's excretory opening in the absorbent core 11 in the worn state.

[0055] The core wrap sheet 12 is a liquid-permeable sheet member. The core wrap sheet 12 in the present embodiment is a tissue having cellulose fibers. The core wrap sheet 12 covers the absorbent core 11 to maintain the shape of the absorbent core 11 and promote the diffusion of liquid to the absorbent core 11.

[0056] As shown in FIG. 6, the core wrap sheet 12 has a skin-side portion 12a located on the skin side of the absorbent core 11 and a non-skin-side portion 12b located on the non-skin side of the absorbent core 11. In the present embodiment, as shown in FIG. 6 and the like, by folding both side ends of the core wrap sheet 12 back to the skin side of the absorbent core 11, the skin-side surface and the non-skin-side surface of the absorbent core 11 are covered with the core wrap sheet 12. Specifically, with the tip 12ea along the longitudinal direction of the core wrap sheet 12 on the outside and the tip 12eb along the other longitudinal direction on the inside, the absorbent core 11 is wrapped with the core wrap sheet 12 so as to cover the side ends in the width direction of the absorbent core 11. However, the shape and form of the core wrap sheet 12 are not limited to this. For example, the core wrap sheet 12 may be configured as two sheet members and disposed on the skin side and the non-skin side of the absorbent core 11, respectively. Note that no adhesive is provided inside the core wrap sheet 12 of the present embodiment. That is, the absorbent core 11 and the core wrap sheet 12 are not fixed with an adhesive, and the shape of the absorbent core 11 is maintained by being wrapped with the core wrap sheet 12.

[0057] FIG. 7 is a plan view of the absorber 10 as viewed from the skin side. In FIG. 7, the middle-high portion 11d in the absorbent core 11 is shown omitted. As shown in FIG. 7, the absorber 10 has a central squeezing portion 14 and a plurality of absorber squeezing portions 15. The central squeezing portion 14 and the absorber squeezing portions 15 are portions where the absorbent core 11 and the core wrap sheet 12 are squeezed in the thickness direction, respectively.

[0058] The central squeezing portion 14 and the absorber squeezing portions 15 are formed, for example, by squeezing the absorber 10 in the manufacturing process through the roll gap between a convex roller having a plurality of convex portions and an anvil roller with a flat surface. The central squeezing portion 14 and the absorber squeezing portions 15 of the present embodiment are portions where the absorber 10 is pressed from the non-skin side to the skin side by passing the absorber 10 through the roll gap with the convex roller in contact with the non-skin side surface of the absorber 10 and the anvil roller in contact with the skin side surface of the absorber 10.

[0059] The central squeezing portion 14 is a linear squeezing portion provided along the longitudinal direction and at the central portion in the width direction. The central squeezing portion 14 is a portion recessed in the thickness direction from the skin side or the non-skin side from the front end to the rear end of the absorber 10. The central squeezing portion 14 is a guiding portion that guides the absorber 10 to bend toward the skin side in the thickness direction starting from the central squeezing portion 14. Also, since the central squeezing portion 14 has a higher fiber density than the non-squeezed portion, it is also a guiding portion that guides excrement in the longitudinal direction by capillary action.

[0060] The absorber squeezing portion 15 is a squeezing portion arranged in a substantially staggered pattern over the entire area of the absorber 10. In the absorber squeezing portion 15 of the present embodiment, a plurality of elliptical squeezing portions are provided. The absorber squeezing portion 15 is also a portion recessed in the thickness direction from the skin side or the non-skin side, similar to the central squeezing portion 14. By providing the absorber squeezing portion 15, it becomes easier to maintain the shape of the absorber 10. Also, since the absorber squeezing portion 15 has a higher fiber density than the non-squeezed portion, it becomes a portion that easily absorbs excrement in the absorbent core 11 due to capillary action. The difference in density between the absorber squeezing portion 15 and the non-squeezed portion makes it easier to suppress the diffusion of the oil agent Y in the absorbent core 11 described later.

[0061] Also, as shown in FIG. 1 and the like, the napkin 1 has a linear squeezing portion EL and a circular squeezing portion ee. The linear squeezing portion EL is a portion that squeezes at least a part of the topsheet 21, the second sheet 22, and the absorber 10 in the thickness direction. The linear squeezing portion EL of the napkin 1 in the present embodiment has a front squeezing portion ELa provided on the front side of the central line CL in the longitudinal direction, a rear squeezing portion ELb provided on the rear side of the central line CL, and a central squeezing portion ELc provided between the front squeezing portion ELa and the rear squeezing portion ELb. By providing the linear squeezing portion EL, the joining in the thickness direction of each member can be strengthened, the fiber density can be increased, and the liquid absorbency can be improved. The linear squeezing portion EL is a linear squeezing portion along the longitudinal direction in plan view, and a pair of them are provided at a predetermined interval in the width direction. A plurality of circular squeezing portions ee are provided at a central portion in the width direction and at a position overlapping with the calf region CA in the longitudinal direction. The circular squeezing portion ee is a squeezing portion having a circular shape in plan view, and is a portion obtained by squeezing at least a part of the topsheet 21, the second sheet 22, and the absorber 10 in the thickness direction.

[0062] Since the linear squeezing portion EL and the circular squeezing portion ee are portions where the members stacked in the thickness direction are crushed, the fiber density of each member in each squeezing portion is higher than the fiber density of the portion where the squeezing portion is not provided. The linear squeezing portion EL and the circular squeezing portion ee are formed, for example, by squeezing the napkin 1 in the manufacturing process through the roll gap between a convex roller having a plurality of convex portions and an anvil roller having a flat surface.

[0063] <<<Regarding the 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 vaginal orifice of the wearer and diffuses it over a wide range in the absorbent article, so that the excrement hardly stays on the skin side surface of the absorbent article and reduces the adverse effects and discomfort on the skin of the wearer. In particular, for sanitary napkins, since they absorb excrement such as highly viscous menstrual blood, absorbability and diffusibility of excrement are required. Therefore, conventionally, means for providing a substance or the like that promotes the diffusion of excrement in the absorbent article has been known. However, by using a substance or the like that promotes the diffusion of excrement, there has been a risk that the excrement is excessively diffused in the absorbent article and leaks from the absorbent article.

[0064] The napkin 1 of the present invention is provided with an oil agent Y that promotes the diffusion of excrement in the absorbent core 11. Further, the absorbent core 11 of the napkin 1 has crushed fibers containing hardwood fibers made of hardwood. And when the absorbent core 11 is divided into three equal parts in either the longitudinal direction or the width direction, 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 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, an oil agent Y is applied to the skin side surface of the topsheet 21 in the region Y11 of FIG. 1. FIG. 8 is a schematic plan view for explaining the region where the oil agent Y is provided. FIG. 9 is a schematic cross-sectional view for explaining the region where the oil agent Y is provided. Note that FIGS. 8 and 9 are schematic views, and for the sake of convenience, members are omitted or simplified. In FIGS. 8 and the like, the region where the oil agent Y is provided in the napkin 1 is shown. The region Y11 is the region where the oil agent Y is provided in the absorbent core 11 (hereinafter, the region Y11 is also referred to as the "core oil agent existing region Y11"). The region Y21 is the region where the oil agent Y is provided in the topsheet 21 (hereinafter, the region 21 is also referred to as the "surface oil agent existing region Y21"). Further, in FIG. 9, the region where the oil agent Y is provided is shown by the hatched portion slanting downward to the left. However, FIG. 9 is for explaining the planar arrangement of the oil agent Y, and the oil agent Y is not necessarily provided over the entire thickness direction of each member. For example, the oil agent Y may be provided only on the skin side portion of the absorbent core 11 and not on the non-skin side portion of the absorbent core 11.

[0066] As shown in FIG. 8, when the absorbent core 11 is divided into three equal parts in the longitudinal direction of the napkin 1, it has a front side portion (one side portion) Ta, a central portion Tb, and a rear side portion (the other side portion) Tc in order from the front side (one side) in the longitudinal direction. And it has the feature that the basis weight (weight of the oil agent Y per unit area) of the oil agent Y provided in the central portion Tb is higher than the basis weight of the oil agent provided in the front side portion Ta. Alternatively, the napkin 1 in which the absorbent core 11 includes hardwood fibers and the oil agent Y has, as shown in FIG. 8, a left side portion (one side portion) Wa, a central portion Wb, and a right side portion (the other side portion) Wc in order from one side when the absorbent core 11 is divided into three equal parts in the width direction of the napkin 1. And it has the feature that the basis weight of the oil agent Y provided in the central portion Wb is higher than the basis weight of the oil agent provided in the left side portion Wa. Note that the left side portion Wa of the napkin 1 corresponds to the left side of the wearer when worn and is the left side in FIG. 8.

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

[0068] The region Y11 where the oil agent Y of the absorbent core 11 of the napkin 1 of the present embodiment is provided is provided at substantially the central portion of the napkin 1. Specifically, in the longitudinal direction, most of the region Y11 is provided at the central portion Tb in the longitudinal direction, and a part of the oil agent Y is provided at the front side portion Ta in the longitudinal direction. The rear side portion Tc in the longitudinal direction is not provided with the oil agent Y. In the longitudinal direction, the basis weight of the oil agent Y provided at the central portion Tb (weight of the oil agent Y at the central portion Tb / area of the central portion Tb) is larger than the basis weight of the oil agent Y provided at the front side portion Ta (weight of the oil agent Y at the front side portion Ta / area of the front side portion Ta). Also, in the longitudinal direction, the basis weight of the oil agent Y provided at the central portion Tb (weight of the oil agent Y at the central portion Tb / area of the central portion Tb) is larger than the basis weight of the oil agent Y provided at the rear side portion Tc (weight of the oil agent Y at the rear side portion Tc / area of the rear side portion Tc). In the width direction, most of the region Y11 is provided at the central portion Wb in the width direction, a part of the oil agent Y is provided at the left side portion Wa in the width direction, and a part of the oil agent Y is provided at the right side portion Wc in the width direction. In the width direction, the basis weight of the oil agent Y provided at the central portion Wb (weight of the oil agent Y at the central portion Wb / area of the central portion Wb) is larger than the basis weight of the oil agent Y provided at the left side portion Wa (weight of the oil agent Y at the left side portion Wa / area of the left side portion Wa). Also, in the width direction, the basis weight of the oil agent Y provided at the central portion Wb (weight of the oil agent Y at the central portion Wb / area of the central portion Wb) is larger than the basis weight of the oil agent Y provided at the right side portion Wc (weight of the oil agent Y at the right side portion Wc / area of the right side portion Wc).

[0069] By making the basis weight of the oil agent in the central part of the absorbent core 11 of the napkin 1 higher than that of the oil agent Y on one side part in either the longitudinal direction or the width direction of the absorbent core 11, it becomes easier to promote the diffusion of excrement in the central part than on one side part in the absorbent core 11. Also, by making the basis weight of the oil agent Y on one side part in either the longitudinal direction or the width direction lower than that of the oil agent Y in the central part, it becomes easier to suppress the diffusion of excrement on one side part than in the central part in the absorbent core 11. Generally, fibers made of hardwoods have the characteristic that their fiber length is shorter than that of softwood fibers. In the absorbent core 11, the longer the fiber length, the easier it is to promote diffusion. Therefore, by including hardwood fibers as the ground fibers of the absorbent core 11, it becomes easier to suppress the diffusion of excrement on the side part where the basis weight of the oil agent Y is low. And even when the absorbent core 11 contains hardwood fibers as the ground fibers, by making the basis weight of the oil agent in the central part in either the longitudinal direction or the width direction higher than that of the oil agent Y on one side part, it becomes easier to promote the diffusion of excrement in the central part of the absorbent core 11, so that the risk of excrement remaining on the surface of the absorbent article during wearing can be reduced. Thereby, by promoting the diffusion of excrement in the central part of the absorbent core 11 of the napkin 1, it becomes difficult for excrement to remain on the skin side surface of the absorbent core 11, reducing the adverse effects and discomfort on the wearer's skin, while reducing the risk of excrement folding outward from one end on either the longitudinal or width direction of the napkin 1. Also, during wearing, the wearer himself / herself can visually confirm that excrement is likely to diffuse in the central part of the absorbent core 11 and that it is difficult for excrement to diffuse in one side part in the longitudinal or width direction, which can easily reduce the concerns of the wearer who feels that excrement may leak from the napkin 1.

[0070] Examples of the ground fibers include pulp, such as wood pulp obtained from softwoods (e.g., southern yellow pine) or hardwoods (e.g., eucalyptus), bagasse, kenaf, bamboo, hemp, cotton (e.g., cotton linter), etc. of non-wood pulp; regenerated cellulose fibers such as rayon fibers; semi-synthetic fibers such as acetate fibers, etc. In absorbent articles, softwood fibers (softwood pulp) with a relatively long fiber length are often used.

[0071] The average fiber length of softwood fibers (softwood pulp) is 2.5 mm, and the average fiber length of hardwood fibers (hardwood pulp) is 0.79 mm. That is, the average fiber length of hardwood fibers is shorter than that of softwood fibers. Hardwood fibers used as the pulverized fibers in the absorbent core 11 are less likely to promote the diffusion of excrement (liquid) than softwood fibers. Therefore, while providing the oil agent Y at the central part in the longitudinal direction or the width direction of the absorbent core 11 containing hardwood fibers to promote diffusion, on one side part in the longitudinal direction or the width direction where the basis weight of the oil agent Y is low, it becomes easier to suppress the diffusion of excrement, and the leakage of excrement can be reduced.

[0072] The pulverized fibers of the absorbent core 11 in this embodiment are composed only of hardwood fibers (hardwood pulp). That is, all the pulverized fibers in the absorbent core 11 are hardwood fibers (100% hardwood fibers). Thereby, while promoting the diffusion of excrement by the oil agent Y at the central part in the longitudinal direction or the width direction of the absorbent core 11, one side part in the longitudinal direction or the width direction is a region of the oil agent Y with a low basis weight, and due to the hardwood fibers with a short average fiber length, it becomes easier to suppress the diffusion of excrement on one side part in the longitudinal direction or the width direction.

[0073] In addition, the pulverized fibers of the absorbent core 11 may contain softwood fibers (softwood pulp) made of softwood in addition to the hardwood pulp. When the absorbent core 11 contains softwood fibers, it is preferable that the total weight of the hardwood fibers is more 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 excrement at the central part in the longitudinal direction or the width direction of the absorbent core 11 by the oil agent Y, and at the same time, it becomes easier to suppress the diffusion of excrement on one side part in the longitudinal direction or the width direction of the absorbent core 11.

[0074] Whether the pulverized fibers of the absorbent core 11 contain hardwood fibers can be confirmed by a well-known method. For example, it can be carried out by the following method. First, take out a predetermined weight (0.04 g) of the pulverized fibers of the absorbent core 11 of the napkin 1 as a sample, and hydrolyze the pulverized fibers with water (distilled water). Next, transfer the sample to a beaker, take an image using a fiber length distribution measuring device (manufactured by Valmet Corporation, "Valmet FS5"), and measure the fiber length. In this device, the concentration of the sample is automatically adjusted to 15 - 23 mmg / L. By comparing the obtained fiber length with the average fiber length of hardwood fibers, the presence of hardwood fibers in the sample can be confirmed.

[0075] Preferably, 50% or more of the length-weighted average of the pulverized fibers in the absorbent core 11 is composed of fibers with a fiber length of 1 mm or less. Since the absorbent core 11 contains many fibers with a short fiber length, it is possible to make it difficult to cause planar diffusion of excrement along the fibers in the absorbent core 11. As a result, it becomes easier to promote the vertical transfer of excrement from the skin side to the non-skin side of the absorbent core 11, and it becomes easier to reduce 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 the oil agent Y is preferably an amphiphilic substance. Since the oil agent Y is an amphiphilic substance and has both a hydrophilic group and a hydrophobic group, when worn, the contact between the oil agent Y and excrement changes the surface tension of the excrement, and in the region where the oil agent Y is applied, it becomes easier to promote the diffusion of excrement (liquid).

[0077] As the oil agent Y, for example, the following can be used. [Ester of chain hydrocarbon tetrol and at least 1 fatty acid] · Unister H-408BRS, manufactured by NOF Corporation Pentaerythritol tetra-2-ethylhexanoate, weight average molecular weight: about 640 · Unister 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 branched-chain hydrocarbons 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 fatty acids of C8:C10:C12 in a weight ratio of approximately 37:7:56, weight average molecular weight: about 570 · Tri-CL oil fatty acid glyceride, manufactured by NOF Corporation A triester of glycerin and fatty acids containing fatty acids of C8:C12 in a weight ratio of approximately 44:56, weight average molecular weight: about 570 · Panasate 810s, manufactured by NOF Corporation A triester of glycerin and fatty acids containing fatty acids of C8:C10 in a weight ratio of approximately 85:15, weight average molecular weight: about 480 · Panasate 800, manufactured by NOF Corporation A triester of glycerin and fatty acids where all fatty acids are octanoic acid (C8), weight average molecular weight: about 470 · Panasate 800B, manufactured by NOF Corporation A triester of glycerin and fatty acids where all fatty acids are 2-ethylhexanoic acid (C8), weight average molecular weight: about 470 · NA36, manufactured by NOF Corporation A triester of glycerin and fatty acids containing fatty acids of C16:C18:C20 (including both saturated and unsaturated fatty acids) in a weight ratio of approximately 5:92:3, weight average molecular weight: about 880 · Tri-castor oil fatty acid glyceride, manufactured by NOF Corporation A triester of glycerin and fatty acids containing fatty acids of C8:C10:C12:C14:C16 (including both saturated and unsaturated fatty acids) in a weight ratio of approximately 4:8:60:25:3, weight average molecular weight: 670 · Caprylic acid diglyceride, manufactured by NOF Corporation A diester of glycerin and fatty acids where the fatty acid is octanoic acid, weight average molecular weight: 340

[0079] [Ester of a chain hydrocarbon diol and at least one fatty acid] · Unister H-208BRS, manufactured by NOF Corporation Neopentyl glycol di(2-ethylhexanoate), weight average molecular weight: about 360 · Compol BL, manufactured by NOF Corporation Monoester of butylene glycol and dodecanoic acid (C12), weight average molecular weight: about 270 · Compol BS, manufactured by NOF Corporation Monoester of butylene glycol and octadecanoic acid (C18), weight average molecular weight: about 350

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

[0081] [Ether of a compound having a chain hydrocarbon part and 1 hydroxyl group substituting a hydrogen atom of the chain hydrocarbon part]

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

[0083] [Ester of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having 3 carboxyl groups and at least one aliphatic monohydric alcohol] · Tributyl O-acetylcitrate, 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 2 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 moiety 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 C-C single bonds of the chain hydrocarbon moiety]

[0086] [Ester of fatty acid and aliphatic monohydric alcohol] ·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] ·Unionol PB500, manufactured by NOF Corporation Polybutylene glycol, weight average molecular weight: about 500 ·Unionol PB700, manufactured by NOF Corporation Polyoxybutylene polyoxypropylene glycol, weight average molecular weight: about 700

[0089] [Chain hydrocarbon] ·Pearl Rim 6, manufactured by NOF Corporation Branched-chain hydrocarbon produced by copolymerizing fluid isoparaffin, isobutene and n-butene and then adding 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 acid with hydrogen added to NA36 to reduce the ratio of double bonds derived from the unsaturated fatty acid as the raw material, weight average molecular weight: about 880 ·(Caprylic acid / capric acid) monoglyceride, manufactured by NOF Corporation A monoesters of glycerin and fatty acid containing octanoic acid (C8) and decanoic acid (C10) in a weight ratio of approximately 85:15, weight average molecular weight: about 220 ·Monomuls 90-L2 lauric acid monoglyceride, manufactured by Cognis Japan K.K. ·Isopropyl citrate, manufactured by Tokyo Chemical Industry Co., Ltd. Weight average molecular weight: about 230 ·Distearyl malate Weight average molecular weight: about 640 ·Unionol PB1000R, manufactured by NOF Corporation Polybutylene glycol, weight average molecular weight: about 1,000 ·Unionol D-250, manufactured by NOF Corporation Polypropylene glycol, weight average molecular weight: about 250 ·Unionol D-400, manufactured by NOF Corporation Polypropylene glycol, weight average molecular weight: about 400 ·Unionol D-700, manufactured by NOF Corporation Polypropylene glycol, weight average molecular weight: about 700 ·Unionol D-1000, manufactured by NOF Corporation Polypropylene glycol, weight average molecular weight: about 1,000 ·Unionol D-1200, manufactured by NOF Corporation Polypropylene glycol, weight average molecular weight: about 1,160 ·Unionol D-2000, manufactured by NOF Corporation Polypropylene glycol, weight average molecular weight: about 2,030 ·Unionol D-3000, manufactured by NOF Corporation Polypropylene glycol, weight average molecular weight: about 3,000 ·Unionol 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 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, about 15 repeating units, weight average molecular weight: about 1,140 · Nonion S-6, manufactured by NOF Corporation Polyoxyethylene monostearate, about 7 repeating units, weight average molecular weight: about 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: about 960 · Unionol TG-330, manufactured by NOF Corporation Glyceryl ether of polypropylene glycol, about 6 repeating units, weight average molecular weight: about 330 · Unionol TG-1000, manufactured by NOF Corporation Glyceryl ether of polypropylene glycol, about 16 repeating units, weight average molecular weight: about 1,000 · Unionol TG-3000, manufactured by NOF Corporation Glyceryl ether of polypropylene glycol, about 16 repeating units, weight average molecular weight: about 3,000 · Unionol TG-4000, manufactured by NOF Corporation Glyceryl ether of polypropylene glycol, about 16 repeating units, weight average molecular weight: about 4,000 · Uniloop DGP-700, manufactured by NOF Corporation Diglyceryl ether of polypropylene glycol, about 9 repeating units, weight average molecular weight: about 700 · Unionox HC60, manufactured by NOF Corporation Polyoxyethylene hydrogenated castor oil, weight average molecular weight: about 3,570 · Vaseline, manufactured by Cognis Japan K.K. Hydrocarbon derived from petroleum, semi-solid

[0091] The comparison of the basis weight of Oil Agent Y can be carried out by a well-known method. For example, a reagent corresponding to the Oil Agent Y used may be applied and compared by color change or shade. In the napkin 1 of the present embodiment, as the Oil Agent Y, Panasate 810S (triglyceride, manufactured by NOF Corporation) is used. This Oil Agent Y is an oil agent containing unsaturated fatty acids, and this oil agent can promote excrement, impart unsaturated fatty acids to the skin of the wearer to improve the texture, and protect the skin of the wearer. For this Oil Agent Y, the presence and the comparison of the basis weight of the Oil Agent Y can be carried out using the oil leakage color developing agent "Molemi Oil (manufactured by Tacet Co., Ltd.)". Specifically, the absorbent core 11 is taken out from the napkin 1, and the above-mentioned oil leakage color developing agent is sprayed over the entire area of the absorbent core 11. When the oil leakage color developing agent is applied, the part where oil (Oil Agent Y) exists will show a red color. The area that does not show a red color has no Oil Agent Y applied, and the basis weight of the Oil Agent Y is 0 (zero). On the other hand, in the area that shows a red color, by comparing the shades of red, the comparison of the basis weight of the Oil Agent Y in each part can be carried out.

[0092] In the napkin 1 of the present embodiment, in the longitudinal direction and the width direction, the basis weight of the oil agent Y provided at the central portion is higher than the basis weight of the oil agent Y provided at one side portion. That is, the basis weight of the oil agent Y provided at the central portion Tb is higher than the basis weight of the oil agent provided at the front side portion Ta, and the basis weight of the oil agent Y provided at the central portion Wb is higher than the basis weight of the oil agent provided at the left side portion Wa. Thereby, the central portion (the portion that is the central portion Tb and also the central portion Wb) in the longitudinal direction and the width direction of the absorbent core 11 is a portion that is likely to come into contact with the excretion port such as the vaginal orifice of the wearer during wearing. Therefore, due to the high basis weight of the oil agent Y in the central portion in the longitudinal direction and the width direction of this absorbent core 11, it is possible to quickly absorb the excrement excreted during wearing and to easily promote the diffusion of the excrement. On the other hand, by making it easier to suppress the diffusion of each one side portion Ta, Wa in the longitudinal direction and the width direction of the absorbent core 11, it is possible to reduce the risk of excrement leaking from the outside of the front side (one side) in the longitudinal direction of the napkin 1 and from the outside of the left side (one side) in the width direction.

[0093] Furthermore, it is preferable that no oil agent Y is provided at the outer end portion of the front side portion (one side portion) Ta in the longitudinal direction of the absorbent core 11 and at the outer end portion of the left side portion (one side portion) Wa in the width direction. Thereby, it becomes easier to suppress the diffusion of excrement at the outer end portion of the front side portion (one side portion) Ta in the longitudinal direction of the absorbent core 11 and at the outer end portion of the left side portion (one side portion) Wa in the width direction, and it is possible to reduce the risk of excrement leaking from the outside of the front side (one side) in the longitudinal direction of the napkin 1 and from the outside of the left side (one side) in the width direction. Note that the outer end portion of the front side portion (one side portion) Ta in the longitudinal direction of the absorbent core 11 is a portion having a length of 10 mm from the front end in the longitudinal direction of the absorbent core 11, and more preferably a portion having a length of 5 mm from the front end. The outer end portion of the left side portion (one side portion) Wa in the width direction of the absorbent core 11 is a portion having a length of 10 mm from the left end in the width direction of the absorbent core 11, and more preferably a portion having a length of 5 mm from the left end.

[0094] Further, it is preferable that the napkin 1 has a linear squeezing portion (squeezing portion) EL obtained by squeezing the absorbent core 11 in the thickness direction. As described above, the linear squeezing portion EL of the napkin 1 includes a rear squeezing portion ELb on the rear side of the center line CL in the longitudinal direction (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 provided on the front side of the front end of the rear squeezing portion ELb. The linear squeezing portion EL and the rear squeezing portion ELb are portions having a higher fiber density than the surroundings and are portions where the diffusion of excrement is likely to be promoted by capillary action. Therefore, by providing the oil agent Y on the front side of the front end of the rear squeezing portion ELb, it is easier to suppress the diffusion behind the absorbent core 11, and the risk of excrement leaking outside the rear side of the napkin 1 can be reduced.

[0095] As described above, it has a core wrap sheet 12 that covers the absorbent core 11. Among the core wrap sheet 12, it is preferable that the average fiber length of the fibers of the skin-side portion 12a (core wrap sheet) located on the skin side of the absorbent core 11 is equal to or longer than the average fiber length of the crushed fibers of the absorbent core 11. By this, compared to the case where the average fiber length of the fibers of the skin-side portion 12a is shorter than the average fiber length of the crushed fibers of the absorbent core 11, during wearing, it becomes easier to promote the absorption and diffusion of excrement in the skin-side portion 12a. Therefore, by vertically transferring the excrement from the skin-side portion 12a, where the excrement is diffusely spread in a planar manner, to the absorbent core 11 located on the non-skin side of the skin-side portion 12a, it becomes easier to promote the penetration of excrement into the absorbent core 11. The average fiber length of the crushed fibers of the absorbent core 11 and the average fiber length of the fibers of the skin-side portion 12a can be measured by a well-known method. For example, an image is taken using the above-described fiber length distribution measuring device (manufactured by Valmet Corporation, "Valmet FS5"), and the fiber length is measured to obtain the values.

[0096] The fibers of the skin-side portion 12a (core wrap sheet) can be taken out, for example, by the following method. First, the napkin 1 is decomposed using toluene to take out the core wrap sheet 12. The taken-out core wrap sheet is dried. Then, put 15 g of the core wrap sheet and about 1.5 L of water (adjust the water so that the concentration is 1% with respect to the weight of the core wrap sheet) into a plastic container (inner diameter: 120 mm, height: 220 mm), and stir at room temperature for about 24 hours using a stirrer (EYELA MAZELA Z, manufactured by Tokyo Rika Kikai Co., Ltd.). At this time, stir slowly so that the fibers do not break. After that, suck up the fibers dispersed in the water together with the water using a dropper (hole diameter: 2 - 3 mm). Collect the taken-out fibers by suction filtration and dry them. Regarding the taken-out fibers, measure the fiber length using an electron microscope, and calculate the average fiber length from the measured fiber lengths.

[0097] For the skin-side part (core wrap sheet) 12a of the core wrap sheet 12 that is located on the skin side of the absorbent core 11 (Figure 6), it is preferable that no adhesive is provided between the skin-side surface of the absorbent core 11 and the non-skin-side surface of the skin-side part 12a. That is, it is preferable that the skin-side surface of the absorbent core 11 and the skin-side part 12a are not adhered with an adhesive. The oil agent Y that promotes excrement is likely to be compatible not only with excrement but also with the adhesive. If an adhesive is provided between the skin-side surface of the absorbent core 11 and the non-skin-side surface of the skin-side part 12a, in the state before wearing the napkin 1 (before absorbing excrement), the oil agent Y will be compatible with the adhesive on the skin-side part 12a, and the oil agent Y will diffuse into an unintended range on the skin-side part 12a. Then, when wearing the napkin 1, when absorbing excrement, the excrement that has diffused planarly on the skin-side part 12a will move toward the absorbent core 11 on the non-skin side, and excessive diffusion will proceed in a wide range within the absorbent core 11, and there is a risk that excrement will leak from the napkin 1. On the contrary, by not providing an adhesive between the skin-side surface of the absorbent core 11 and the non-skin-side surface of the skin-side part 12a, it is possible to prevent the diffusion of the oil agent Y due to the compatibility of the oil agent Y with the adhesive on the skin-side part 12a, reduce the risk of excessive diffusion of excrement in the absorbent core 11 during wearing, and reduce the risk of excrement leaking outside the napkin 1.

[0098] Regarding the absorbent core 11 and the core wrap sheet 12, it is preferable that no adhesive is provided between the non-skin side surface 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. That is, it is preferable that the non-skin side surface of the absorbent core 11 and the non-skin side portion 12b are not adhered with an adhesive. Similar to the skin side surface (skin side portion 12a), on the non-skin side surface of the absorbent core 11, the oil agent Y and the adhesive are compatible, preventing the excessive diffusion of the oil agent Y in the non-skin side portion 12b. This can reduce the risk that the excrement diffused planar in the non-skin side portion 12b moves to the absorbent core 11 and causes excessive diffusion in a wide range within the absorbent core 11. As a result, the risk of excrement leaking outside the napkin 1 can be reduced.

[0099] As shown in Fig. 2 and the like, the napkin 1 has a main body adhesive portion 32 on the non-skin side surface of the back sheet 31 provided on the outermost non-skin side. The main body adhesive portion 32 is provided to fix the napkin 1 to the wearer's clothing during wearing. When the napkin 1 is viewed in the thickness direction, there are provided an overlapping region y32 where the portion of the absorbent core 11 provided with the oil agent Y overlaps with the main body adhesive portion 32, and a non-overlapping region n32 where the portion of the absorbent core 11 not provided with the oil agent Y overlaps with the main body adhesive portion 32. As shown in Fig. 2, the napkin 1 of the present embodiment has a rectangular region Y11 which is the region of the absorbent core 11 provided with the oil agent Y, and the main body adhesive portion 32 provided inside the region Y11 is the overlapping region y32. And the main body adhesive portion 32 provided outside the 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 is lower than the adhesive strength of the main body adhesive portion 32 in the non-overlapping region n32. Note that the adhesive strength is the strength of the force for fixing the napkin 1 and the clothing, and is also the strength of the force for peeling the napkin 1 fixed to the napkin 1. Note that the main body adhesive portion 32 of the napkin 1 has five linear adhesive application regions (the diagonally downward slanted hatched portions in Fig. 2) intermittently arranged in the width direction on both sides in the left-right direction, but substantially the spaces between the adhesive application regions function as an adhesive portion due to impregnation with an adhesive or the like. Therefore, the main body adhesive portion 32 of the napkin 1 is a rectangular region provided on both sides in the left-right direction and surrounded by the outer ends of the respective adhesive application regions.

[0100] In the napkin 1, the overlapping region y32 of the main body adhesive part 32 is a part where the adhesive of the main body adhesive part 32 is easily compatible with the oil agent Y. When the adhesive and the oil agent Y are mixed, the adhesive strength is likely to decrease. In particular, when a ventilation film that is impermeable to liquids but allows gas ventilation is used as the backsheet 31, the oil agent Y provided in the absorbent core 11 easily passes through the backsheet 31 and mixes with the main body adhesive part 32. Therefore, by providing the main body adhesive part 32 of the napkin 1 with a part having a relatively high adhesive strength and a part having a relatively low adhesive strength, it is possible to reduce the risk of the adhesive strength becoming excessively strong while ensuring the fixing strength to the clothing. Among the absorbent cores 11 of the napkin 1 after use, particularly the part where the oil agent Y is provided contains a large amount of body fluid and is likely to become wet and break easily. When removing the napkin 1 provided with this absorbent core 11 from the clothing, by providing the overlapping region y32 with a low adhesive strength, the napkin 1 can be removed from the clothing with a small force. Therefore, it becomes easier to prevent the shape of the absorbent core 11 in the overlapping region y32 from collapsing and to perform operations such as rolling up the removed napkin 1, making it easier to discard.

[0101] The adhesive strength of the main body adhesive part 32 in each region (overlapping region y32, non - overlapping region n32) can be measured by a well - known method. For example, by the peel test (JIS Z0237), the adhesive strength can be compared by measuring the force required when peeling off the main body adhesive part 32. Specifically, first, the overlapping region y32 and the non - overlapping region n32 of the napkin 1 are each cut into a predetermined size (10 mm×10 mm) to obtain sample pieces. Then, each sample piece is attached to a test plate, and the end of the sample piece is grasped and peeled off. The load for peeling at that time is measured with a load cell. This measurement is performed multiple times for each sample. By dividing the average value of the obtained peeling load [N] by the width (10 mm) of the sample piece and multiplying by 10, the adhesive strength [N / 10 mm] of the main body adhesive force 32 can be calculated. Adhesive strength [N / 10 mm]=(Load [N]×10) / (Width of sample piece) The adhesive strength can be compared based on the calculated adhesive strength [N / 10 mm] of each sample piece. The test plate may be a SUS304 steel plate specified in JIS Z0237, or a sheet member made of 100% cotton or a sheet member made of 100% polyester fixed to a horizontal plate assuming other usage scenarios.

[0102] The napkin 1 is distributed, sold, stored, etc. in a folded state with one or more folding parts F. The folding part F is a folding line along the width direction. In the napkin 1, a front folding part F1 is provided on the front side of the longitudinal center line CL, and a rear folding part F2 is provided on the rear side of the center line CL. The napkin 1 is folded with the skin side facing inward at the folding parts F1 and F2 respectively. The napkin 1 shown in Fig. 1 etc. shows an unfolded state with all the folding parts F unfolded. In this unfolded state of the napkin 1, it is preferable that the oil agent Y is provided across the folding part F in the longitudinal direction. Specifically, as shown in Fig. 1, the region Y11 where the oil agent Y is provided in the absorbent core 11 is provided across the front folding part F1. That is, in a plan view, the front folding part F1 is provided at a position overlapping the region Y11. The front folding part F1 (folding part F) is likely to have a high fiber density in the absorbent core 11. Since the front folding part F1 is along the width direction, excrement reaching the front folding part F1 during wearing is likely to diffuse outward in the width direction along the front folding part F1. Therefore, by providing the region Y11, which is the region where the oil agent Y is provided in the absorbent core 11, to straddle the front folding part F1, when wearing, even if excrement reaches the front folding part F1, the oil agent Y in the region Y11 can easily promote the diffusion of excrement in the longitudinal direction. Thereby, the risk of excrement leaking to the outside in the width direction of the napkin 1 can be reduced.

[0103] Also, it is preferable that the weight per unit volume of the oil agent Y provided in the portion tu closer to the skin side 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 non-skin side than the center 11c in the thickness direction of the absorbent core 11. That is, in the thickness direction of the absorbent core 11, more oil agent Y is provided on the skin side than on the non-skin side. Thereby, at the time of wearing, the excrement absorbed from the skin side surface of the napkin 1 is absorbed from the skin side to the non-skin side of the absorbent core 11, making it easier to move.

[0104] As described above, the topsheet 21 of the napkin 1 is a sheet that can contact the skin of the wearer. It is preferable that the oil agent Y is also provided on the topsheet 21 and the topsheet 21 has a region Y21 where the oil agent Y is provided. And, when viewed in the thickness direction, it is preferable that the basis weight of the oil agent Y provided in the portion overlapping the central portion Tb, Wb in the longitudinal direction or the width direction of the topsheet 21 is higher than the basis weight provided in the portion overlapping one side portion Ta, Wa in the longitudinal direction or the width direction. In the manufacturing process of the napkin 1 of the present embodiment, the oil agent Y is applied from the skin side surface of the topsheet 21 in a state where the topsheet 21 and the absorber 10 are overlapped. And, the oil agent Y impregnated from the topsheet 21 stays in the absorbent core 11 and is in a retained state. In addition to the absorbent core 11, the oil agent Y is also provided on the topsheet 21, and the basis weight of the oil agent Y provided in the portion overlapping the central portion Tb, Wb in the longitudinal direction or the width direction of the topsheet 21 is higher than the basis weight provided in the portion overlapping one side portion Ta, Wa in the longitudinal direction or the width direction, which facilitates the diffusion of excrement in the portion overlapping the central portion Tb, Wb in the longitudinal direction or the width direction of the topsheet 21. As a result, when viewed in the thickness direction, after diffusing the excrement to some extent in the portion overlapping the central portion Tb, Wb in the longitudinal direction or the width direction of the topsheet 21, the excrement is moved to the non-skin side, and it becomes easier to absorb the excrement in a wide range of the central portion Tb, Wb in the longitudinal direction or the width direction of the absorbent core 11, so it becomes easier to speed up the absorption of excrement as the napkin 1. And, while facilitating the absorption of excrement in the central portion Tb, Wb of the absorbent core 11 by the oil agent Y, it becomes easier to suppress the diffusion of excrement in one side portion Ta, Wa in the longitudinal direction or the width direction of the absorbent core 11.

[0105] Also, when the oil agent Y is provided on the topsheet 21 of the napkin 1, as shown in FIG. 9, it is preferable that the length W21 in the width direction of the topsheet 21 is longer than the length W11 in the width direction of the absorbent core 11 (W21>W11) and the oil agent Y is not provided outside the absorbent core 11 in the width direction. Thereby, it becomes easier to suppress the diffusion of excrement at the end in the width direction of the absorbent core 11, and the risk of excrement leaking from the outside in the width direction of the napkin 1 can be reduced.

[0106] When the oil agent Y is provided on the topsheet 21 of the napkin 1, as shown in FIG. 9, it is preferable that the length W21 in the width direction of the topsheet 21 is longer than the length W11 in the width direction of the absorbent core 11 (W21>W11). And the absorbent core 11 has a core oil agent present region Y11 where the oil agent Y is provided and a core oil agent absent region N11 where the oil agent Y is not provided. The topsheet 21 has a surface oil agent present region Y21 where the oil agent Y is provided and a surface oil agent absent region N21 where the oil agent Y is not provided. In the thickness direction of this napkin 1, there are preferably 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 absent region N11 and the surface oil agent present region Y21 overlap, and a third region R3 where the surface oil agent absent region and the absorbent core do not overlap. And as shown in FIG. 9, it is preferable that the first region R1, the second region R2, and the third region R3 are provided in the order of the first region R1, the second region R2, and the third region R3 from the inner side to the outer side in the width direction. Thereby, when worn, first, the diffusion of excrement is promoted in the first region R1 of the napkin 1, and it is easy to suppress the diffusion of excrement in the second region R2 and the third region R3. Therefore, the risk of excrement leaking to the outside in the width direction of the napkin 1 can be reduced.

[0107] Furthermore, it is preferable that the core oil agent present region Y11 has a core oil agent concentrated region Y11k in the first region R1 where the basis weight of the oil agent Y is higher than that of the surroundings, and the surface oil agent present region Y21 has a surface oil agent thin region Y21u in the first region R1 where the basis weight of the oil agent Y is lower than that of the surroundings. In such a case, when looking at the napkin 1 in the thickness direction, it is more preferable that there is a portion where the core oil agent concentrated region Y11k and the surface oil agent thin region Y21u overlap at the center in the width direction and the center in the longitudinal direction of the first region R1.

[0108] Of the top sheet 21 that can contact the wearer's skin, the first region R1 is a portion that is likely to contact the excretion opening such as the vaginal opening during wearing. The excretion opening such as the vaginal opening is a particularly sensitive part, and if the oil agent Y directly touches it, it may cause irritation or adverse effects. In particular, since the absorbent core 11 of the present embodiment has a raised portion 11d protruding toward the skin side at the central portions in the longitudinal direction and the width direction, it is more likely to contact the excretion opening such as the vaginal opening of the wearer. On the other hand, the top sheet 21 preferably includes the oil agent Y. In particular, in the first region R1 that overlaps with the core oil agent existing region Y11 when viewed in the thickness direction, it is preferable to promote the penetration and diffusion of excrement in the top sheet 21, and prevent the excrement from flowing on the surface (skin side surface) of the top sheet 21 and leaking from the napkin 1. Therefore, by having the surface oil agent thin region Y21u in the first region R1 of the top sheet 21, the amount of the oil agent Y provided in the portion that may directly contact the excretion opening of the wearer is reduced, thereby promoting the penetration and diffusion of excrement in the top sheet 21, and reducing the risk that the oil agent Y may cause irritation or adverse effects to the wearer's excretion opening. Also, when viewed in the thickness direction, the first region R1 has a core oil agent concentrated region Y11k and a surface oil agent thin region Y21u, and by having a portion where the core oil agent concentrated region Y11k and the surface oil agent thin region Y21u overlap when viewed in the thickness direction, it is easier to transfer from the top sheet 21 to the non-skin side rather than diffusing in the top sheet 21, and it is easy to promote the absorption of excrement and the diffusion of excrement in the absorbent core 11 having the core oil agent concentrated region Y11k with a higher basis weight of the oil agent Y than the surroundings. Therefore, it becomes easier to draw excrement into the absorbent core 11, and the risk of excrement diffusing and leaking on the surface of the napkin 1 can be reduced.

[0109] An absorbent article such as a napkin may have a post-treatment tab or a post-treatment tape. For example, as shown in FIG. 10, the napkin 100 is a night-time sanitary napkin, and the napkin 100 may be provided with a post-treatment tab 50. FIG. 10 is a plan view of the napkin 100 viewed from the non-skin side. For the napkin 100 having the same configuration as the above-described napkin 1, the same reference numerals are given and the description is omitted.

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

[0111] Regarding this post - treatment tab 50, when looking at the napkin 100 in the thickness direction, it is preferable that the oil agent Y (region Y11) does not overlap with the post - treatment tab 50. The excrement diffuses through the oil agent Y in the absorbent core 11 of the used napkin 100, making the shape of the absorbent core 11 liable to collapse. On the other hand, in the absorbent core 11, in the portion that does not overlap with the oil agent Y (region Y11) when looking in the thickness direction, since the diffusion of excrement by the oil agent Y is relatively less than the portion that overlaps with the oil agent Y (region Y11), the shape of the absorbent core 11 is less likely to collapse. Therefore, by providing the post - treatment tab 50 in the portion that does not overlap with the oil agent Y (region Y11) when looking in the thickness direction, when rolling up and discarding the napkin 100 after use, it becomes easier to roll up the absorbent core 11 while preventing the collapse of the shape of the absorbent core 11.

[0112] Note that although the napkin 100 is provided with the post - treatment tab 50, it is not limited thereto. For example, in the case of disposable diapers or short - type napkins as absorbent articles, a post - treatment tape for maintaining the absorbent article in a rolled state after use may be provided. The post - treatment tape is a film member in which one end in the longitudinal direction of the tape is fixed to the absorbent article and the other end in the longitudinal direction is provided with an adhesive portion. After use, by winding the rolled - up absorbent article with the post - treatment tape and fixing it with the adhesive portion at the other end of the post - treatment tape, it becomes easier to maintain the rolled state of the absorbent article. For such an absorbent article provided with a post - treatment tape, similar to the post - treatment tab 50, it is preferable to provide the post - treatment tape at a position that does not overlap with the oil agent Y provided in the absorbent core 11 when viewed in the thickness direction.

[0113] ===Other Embodiments=== As described above, the embodiments of the present invention have been explained. However, the above - mentioned embodiments are for facilitating the understanding of the present invention and are not for limiting the interpretation of the present invention. Further, the present invention can be changed and improved without departing from its gist, and it goes without saying that equivalents of the present invention are included therein.

Explanation of Reference Numerals

[0114] 1 Napkin (Absorbent Article), 1W Wing Portion, 10 Absorbent Body, 11 Absorbent Core, 11d Middle - High Portion, 12 Core Wrap Sheet, 12a Skin - Side Portion (Core Wrap Sheet), 12b Non - Skin - Side Portion (Core Wrap Sheet), 14 Central Compression Portion, 15 Absorbent Body Compression 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 Knee - Length Region, ee Circular Compression Portion, EL Linear Compression Portion, Ta front side part (one side part), Tb central part, Tc rear side part (the other side part), Wa left side part (one side part), Wb central part, Wc right side part (the other side part), Y oil agent, Y11 region (core oil agent existing region), Y11k core oil agent concentrated region, N11 core oil agent non-existing region, Y21 region (surface oil agent existing region), Y21u surface oil agent thin region, N21 surface oil agent non-existing 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 comprising an absorbent core having pulverized fibers, wherein the pulverized fibers include hardwood fibers made of hardwood, 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, 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 the above.

2. The absorbent article according to claim 1, wherein the pulverized fibers also include softwood fibers made of softwood, An absorbent article characterized in that the total weight of the hardwood fibers is greater than the total weight of the softwood fibers.

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

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

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

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

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, An absorbent article characterized in that, when viewed in the thickness direction, the oil agent does not overlap with the post-treatment tab or the post-treatment tape.

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, the non-skin side surface of the non-skin side sheet is provided with an adhesive portion, When viewed in the thickness direction, there is an overlapping region where the portion provided with the oil agent overlaps with the adhesive portion, and a non-overlapping region where the portion not provided with the oil agent overlaps with the adhesive portion. The absorbent article is characterized in that 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.

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 average fiber length of the fibers of the core wrap sheet is equal to or greater than the average fiber length of the pulverized fibers of the absorbent core. The absorbent article is characterized by this.

10. The absorbent article according to claim 1 or 2, wherein in the longitudinal direction and the width direction, 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. The absorbent article is characterized by this.

11. The absorbent article according to claim 10, wherein the outer end portion of the one side portion is not provided with the oil agent. The absorbent article is characterized by this.

12. The absorbent article according to claim 1 or 2, which has a surface sheet capable of contacting the skin of the wearer, and the surface sheet is also provided with the oil agent, the length of the surface sheet in the width direction is longer than the length of the absorbent core in the width direction, the absorbent core has a core oil agent present region where the oil agent is provided and a core oil agent non-present region where the oil agent is not provided, the surface sheet has a surface oil agent present region where the oil agent is provided and a surface oil agent non-present region where the oil agent is not provided, 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 non-present region and the surface oil agent present region overlap, and a third region where the surface oil agent non-present region and the absorbent core do not overlap. The absorbent article has these. The first region, the second region, and the third region are provided in the order of the first region, the second region, and the third region from the inner side to the outer side in the width direction. The absorbent article is characterized by this.

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

14. The absorbent article according to claim 1 or 2, having a surface sheet that can contact the skin of the wearer, wherein 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.

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

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

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

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