Absorbent article

Abstract

The invention provides an absorbent article. The absorbent article (1) has a longitudinal direction, a width direction, and a thickness direction that are orthogonal to each other, and is provided with an absorbent core (11) having pulverized fibers, the absorbent article (1) being characterized in that broad-leaved tree fibers formed from broad-leaved trees are included in the pulverized fibers, and an oil agent (Y) that promotes the diffusion of excreta is provided in the absorbent core (11). In either the longitudinal direction or the width direction, when the absorbent core (11) is divided into three equal parts, one side part, a central part and the other side part are sequentially arranged from one side, and the weight per unit area of the oil agent (Y) arranged in the central part is higher than the weight per unit area of the oil agent arranged in the one side part.

Description

Technical Field

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

[0002] Absorbent articles such as sanitary napkins for absorbing excreta are known. When excreta such as menstrual blood is discharged during wearing, it is preferable that the absorbent article quickly absorbs the excreta. For example, Patent Document 1 discloses a sanitary napkin including a topsheet that comes into contact with the skin of a wearer and an absorber located on the non-skin side relative to the topsheet. In order to promote the absorption of excreta such as menstrual blood having a high viscosity during wearing, a blood lubricity imparting agent is provided on the topsheet, so that the excreted excreta can be easily transferred from the topsheet to the absorber, and the stickiness on the skin side of the topsheet is not easily felt.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2013-179982 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] However, while the sanitary napkin described in Patent Document 1 promotes the absorption of excreta, on the other hand, the excreta is overly promoted to spread in the sanitary napkin, and there is a possibility that the excreta leaks from the sanitary napkin.

[0008] The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide an absorbent article that suppresses the spread of excreta on one side in the length direction or width direction of the absorbent article and reduces the possibility of leakage of excreta to the outside from one end in the length direction or width direction of the absorbent article.

[0009] Means for Solving the Problems

[0010] The main invention for achieving the above object is an absorbent article having a length direction, a width direction, and a thickness direction that are orthogonal to each other, and including an absorbent core having shredded fibers. The absorbent article is characterized in that the shredded fibers contain hardwood fibers formed from hardwood trees, an oil agent for promoting the spread of excreta is provided in the absorbent core, and in any one of the length direction and the width direction, when the absorbent core is divided into three equal parts from one side, it sequentially has a side portion, a central portion, and the other side portion from one side, and the unit area weight of the oil agent provided in the central portion is higher than the unit area weight of the oil agent provided in the side portion.

[0011] Other features of the present invention become apparent from the description of this specification and the accompanying drawings.

[0012] Effects of the Invention

[0013] According to the present invention, it is possible to suppress the spread of excrement on one side in the longitudinal direction or the width direction of the absorbent article, and reduce the possibility of excrement leaking outward from the end on one side in the longitudinal direction or the width direction of the absorbent article. Description of the Drawings

[0014] Figure 1 It is a plan view of the sanitary napkin 1 as viewed from the skin side.

[0015] Figure 2 It is a plan view of the sanitary napkin 1 as viewed from the non-skin side.

[0016] Figure 3 It is Figure 1 A schematic cross-sectional view taken along the line A - A in

[0017] Figure 4A It is a plan view of the absorbent core 11. Figure 4B It is Figure 4A A schematic cross-sectional view taken along the line J - J in

[0018] Figure 5 It is Figure 4A An enlarged schematic view of the cross-section taken along the line K - K in

[0019] Figure 6 It is Figure 3 An enlarged view of the absorbent body 10 in

[0020] Figure 7 It is a plan view of the absorbent body 10 as viewed from the skin side.

[0021] Figure 8 It is a plan view for explaining the region where the oil agent Y is provided.

[0022] Figure 9 It is a cross-sectional view for explaining the region where the oil agent Y is provided.

[0023] Figure 10 It is a plan view of the sanitary napkin 100 as viewed from the non-skin side.

[0024] Explanation of Reference Numerals

[0025] 1. Sanitary napkin (absorbent article); 1W. Wing; 10. Absorbent body; 11. Absorbent core; 11d. Middle high part; 12. Core wrapper sheet; 12a. Skin side part (core wrapper sheet); 12b. Non-skin side part (core wrapper sheet); 14. Central compression part; 15. Absorbent body compression part; 21. Topsheet (surface sheet); 22. Second sheet; 23. Side sheet; 24. Reinforcing sheet; 31. Backsheet (non-skin side sheet); 32. Main body adhesive part (adhesive part); 33. Wing adhesive part; CA. Crotch region; ee. Circular compression part; EL. Linear compression part; 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 (region where core oil agent exists); Y11k. Core oil agent concentrated region; N11. Region where core oil agent does not exist; Y21. Region (region where surface oil agent exists); Y21u. Surface oil agent dilute region; N21. Region where surface oil agent does not exist; R1. First region; R2. Second region; R3. Third region. Detailed implementation mode

[0026] According to the description in this specification and the drawings, at least the following matters become clear.

[0027] (Mode 1)

[0028] An absorbent article having a length direction, a width direction, and a thickness direction that are orthogonal to each other, and having an absorbent core with shredded fibers, wherein the shredded fibers contain hardwood fibers formed from hardwood trees, an oil agent for promoting the diffusion of excrement is provided in the absorbent core, and in either the length direction or the width direction, when the absorbent core is divided into three equal parts from one side, it sequentially has a side part, a central part, and the other side part from one side, and the unit area weight of the oil agent provided in the central part is higher than the unit area weight of the oil agent provided in the side part.

[0029] According to Method 1, by making the weight per unit area of the sizing agent provided in the central part higher than that of the sizing agent provided in one side part in either the length direction or the width direction, it is easy to promote the diffusion of the central part of the absorbent core by the sizing agent. On the other hand, in one side part of the absorbent core, the absorbent core contains hardwood fibers and makes the weight per unit area of the sizing agent provided in one side part of the absorbent core lower than that of the sizing agent provided in the central part, so as to be able to suppress the diffusion of excrement in one side part in the length direction or the width direction of the absorbent core and reduce the possibility of excrement leaking to the outside from one end in the length direction or the width direction of the absorbent article. In addition, when worn, by visually recognizing by the wearer the situation that excrement is easy to diffuse in the central part of the absorbent core but not easy to diffuse in one side part in the length direction or the width direction, it is easy to reduce the wearer's concern that excrement may leak from the absorbent article.

[0030] (Method 2)

[0031] The absorbent article according to Method 1 is characterized in that the comminuted fibers also contain softwood fibers formed by softwood trees, and the total weight of the hardwood fibers is greater than the total weight of the softwood fibers.

[0032] According to Method 2, since the absorbent core contains more hardwood fibers with a relatively short average fiber length, it is easy to promote the absorption in the central part of the absorbent core by the sizing agent and at the same time easy to suppress the diffusion of excrement in one side part in the length direction or the width direction of the absorbent core.

[0033] (Method 3)

[0034] The absorbent article according to Method 1 or 2 is characterized in that the absorbent article has a surface sheet capable of contacting the wearer's skin, and the sizing agent is also provided on the surface sheet. When observed in the thickness direction, in the surface sheet, the weight per unit area of the sizing agent provided in the part overlapping with the central part is higher than the weight per unit area of the sizing agent provided in the part overlapping with the one side part.

[0035] According to Method 3, it is easy to promote the absorption in the central part of the absorbent core by the sizing agent and at the same time easy to suppress the diffusion of excrement in one side part in the length direction or the width direction of the absorbent core.

[0036] (Method 4)

[0037] The absorbent article according to any one of Methods 1 to 3 is characterized in that the sizing agent is an amphiphilic substance.

[0038] According to Method 4, it is easy to change the surface tension of excrement and easy to promote the diffusion of excrement in the absorbent core.

[0039] (Mode 5)

[0040] The absorbent article according to any one of Modes 1 to 4, characterized in that a core wrap sheet is provided at a position closer to the skin side than 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.

[0041] According to Mode 5, it is possible to reduce the possibility that the oil agent and the adhesive are mixed on the skin side surface of the absorbent core and diffuse in the skin side surface of the core wrap sheet, and the excrement is absorbed from the core wrap sheet into the absorbent core and excessively diffuses in the absorbent core, thereby reducing the possibility of leakage of excrement to the outside of the absorbent article.

[0042] (Mode 6)

[0043] The absorbent article according to any one of Modes 1 to 5, characterized in that a core wrap sheet is provided at a position closer to the non-skin side than the absorbent core, and no adhesive is provided between the non-skin side surface of the absorbent core and the skin side surface of the core wrap sheet.

[0044] According to Mode 6, it is possible to reduce the possibility that the oil agent and the adhesive are mixed on the non-skin side surface of the absorbent core and diffuse in the skin side surface of the core wrap sheet, and the excrement is absorbed from the core wrap sheet into the absorbent core and excessively diffuses in the absorbent core, thereby reducing the possibility of leakage of excrement to the outside of the absorbent article.

[0045] (Mode 7)

[0046] The absorbent article according to any one of Modes 1 to 6, characterized in that a post-treatment tongue piece or a post-treatment band is provided on the non-skin side surface of the absorbent article, and when observed in the thickness direction, the oil agent does not overlap with the post-treatment tongue piece or the post-treatment band.

[0047] According to Mode 7, the shape of the absorbent core in which the excrement has been diffused by the oil agent is likely to be deformed. Therefore, by providing the post-treatment tongue piece or the post-treatment band at a position that does not overlap with the oil agent when observed in the thickness direction, the position that does not overlap with the oil agent when observed in the thickness direction is a part where the shape of the absorbent core is not easily deformed. Therefore, when the absorbent article is rolled up and discarded after use, it is easy to roll up the absorbent core in a state where the shape of the absorbent core is prevented from being deformed.

[0048] (Mode 8)

[0049] The absorbent article according to any one of Modes 1 to 7 is characterized in that a non-skin-side sheet is provided at the position of the absorbent article closest to the non-skin side, and an adhesive portion is provided on the non-skin side surface of the non-skin-side sheet. The absorbent article has an overlapping region where the portion provided with the oil agent overlaps with the adhesive portion when viewed in the thickness direction and a non-overlapping region where the portion not provided with the oil agent overlaps with the adhesive portion when viewed in the thickness direction. 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.

[0050] The adhesive portion provided on the non-skin side of the absorbent article is provided for fixing to the wearer's clothing during wearing. According to Mode 8, the possibility that the adhesive strength of the adhesive portion becomes too strong can be reduced. For the overlapping region that contains a large amount of body fluid and is prone to kinking after use, when removing the absorbent article from the clothing, it can be done with a smaller force, so the shape of the absorbent core in the overlapping region is not easily deformed and it can be easily discarded.

[0051] (Mode 9)

[0052] The absorbent article according to any one of Modes 1 to 8 is characterized in that the absorbent core has a core wrapping sheet on the skin side of the absorbent core, and the average fiber length of the fibers of the core wrapping sheet is equal to or greater than the average fiber length of the shredded fibers of the absorbent core.

[0053] According to Mode 9, during wearing, by promoting the absorption and diffusion of excrement in the core wrapping sheet, the penetration of excrement in the absorbent core located on the non-skin side can be easily promoted.

[0054] (Mode 10)

[0055] The absorbent article according to any one of Modes 1 to 9 is characterized in that, in the length direction and the width direction, the unit area weight of the oil agent provided at the central portion is higher than the unit area weight of the oil agent provided at the side portion.

[0056] According to Mode 10, while promoting the diffusion of excrement in the central portions in the length direction and the width direction of the absorbent core, the possibility of excrement leaking from the outside of one side in the length direction and the width direction of the absorbent article can be reduced.

[0057] (Mode 11)

[0058] The absorbent article according to Mode 10 is characterized in that the oil agent is not provided at the outer end portion of the side portion.

[0059] According to Mode 11, it is easy to suppress diffusion at the outer end of one side in the length direction and the width direction of the absorbent core, and the possibility of excrement leaking from the outside of one side in the length direction and the width direction of the absorbent article can be reduced.

[0060] (Mode 12)

[0061] The absorbent article according to any one of Modes 1 to 11 is characterized in that the absorbent article has a topsheet capable of abutting against the wearer's skin, and the oil agent is also provided on the topsheet. The length of the topsheet 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 area where the oil agent is provided and a core oil agent absent area where the oil agent is not provided. The topsheet has a surface oil agent present area where the oil agent is provided and a surface oil agent absent area where the oil agent is not provided. The absorbent article has a first area where the core oil agent present area and the surface oil agent present area overlap in the thickness direction, a second area where the core oil agent absent area and the surface oil agent present area overlap in the thickness direction, and a third area where the surface oil agent absent area and the absorbent core do not overlap in the thickness direction. The first area, the second area, and the third area are arranged in the order of the first area, the second area, and the third area from the inside to the outside in the width direction.

[0062] According to Mode 12, in the absorbent article, while promoting diffusion in the first area, it is easy to suppress diffusion in the second area and the third area, and the possibility of excrement leaking from the absorbent article to the outside can be reduced.

[0063] (Mode 13)

[0064] The absorbent article according to Mode 12 is characterized in that the core oil agent present area has a core oil agent concentrated area where the unit area weight of the oil agent is higher than that of the surrounding area in the first area. The surface oil agent present area has a surface oil agent dilute area where the unit area weight of the oil agent is lower than that of the surrounding area in the first area. When observed in the thickness direction, there is a part where the core oil agent concentrated area and the surface oil agent dilute area overlap at the central part in the width direction and the central part in the length direction of the first area.

[0065] According to Mode 13, when worn, the use of the surface oil agent dilution area can reduce the possibility of the oil agent having an adverse effect on the excretory orifice of the wearer, while facilitating the penetration of excrement in the surface sheet by means of the surface oil agent presence area in the first region. In addition, by having a core oil agent concentration area that overlaps with the surface oil agent dilution area when viewed in the thickness direction, the part where the core oil agent concentration area overlaps with the surface oil agent dilution area when viewed in the thickness direction can easily move excrement from the surface sheet to the absorbent core, and the possibility of excrement spreading and leaking on the skin side surface of the absorbent article can be reduced.

[0066] (Mode 14)

[0067] The absorbent article according to any one of Modes 1 to 13, characterized in that the absorbent article has a surface sheet capable of contacting the skin of the wearer, the oil agent is also provided on the surface sheet, the length of the surface sheet in the width direction is longer than the length of the absorbent core in the width direction, and the oil agent is not provided at a position outside the absorbent core in the width direction.

[0068] According to Mode 14, it is easy to suppress the diffusion at the end portions in the width direction of the absorbent core, and the possibility of excrement leaking from the absorbent article to the outside can be reduced.

[0069] (Mode 15)

[0070] The absorbent article according to any one of Modes 1 to 14, characterized in that the absorbent article has a compression portion formed by compressing the absorbent core in the thickness direction, the compression portion has a rear compression portion at a position behind the center in the length direction of the absorbent article, and the rear end of the oil agent is provided at a position in front of the front end of the rear compression portion.

[0071] According to Mode 15, since the rear compression portion with a higher fiber density can easily promote diffusion by capillary action, by providing the oil agent at a position in front of the front end of the rear compression portion, it is easy to suppress the diffusion behind the absorbent core, and the possibility of excrement leaking from the absorbent article to the outside can be reduced.

[0072] (Mode 16)

[0073] The absorbent article according to any one of Modes 1 to 15, characterized in that the weight per unit volume of the oil agent provided at a position 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 at a position closer to the non-skin side than the center in the thickness direction of the absorbent core.

[0074] According to Mode 16, it is easy to absorb excrement absorbed from the skin side toward the non-skin side.

[0075] (Mode 17)

[0076] The absorbent article according to any one of Modes 1 to 16, characterized in that the absorbent article has a folding portion along the width direction, and in the length direction, the oil agent is provided across the folding portion.

[0077] According to Mode 17, in the folding portion, the density of the absorbent core is liable to increase, which is liable to promote diffusion in the width direction. However, by arranging the oil agent across the folding portion in the length direction, diffusion in the length direction is liable to be promoted, and the possibility of excrement leaking to the outside in the width direction of the absorbent article is liable to be reduced.

[0078] ===This Embodiment===

[0079] Hereinafter, as an example of the absorbent article of this embodiment, a sanitary napkin is cited for illustration. However, the sanitary absorbent article is not limited to a sanitary napkin, and may also be a short-pant type sanitary napkin, a panty-type disposable diaper, a belt-type disposable diaper, etc., an absorbent pad, etc.

[0080] <<<Structure of Sanitary Napkin 1 of this Embodiment>>>

[0081] Figure 1 is a top view obtained by observing Sanitary Napkin 1 from the skin side. Figure 2 is a top view obtained by observing Sanitary Napkin 1 from the non-skin side. Figure 3 is Figure 1 a schematic cross-sectional view taken along the line A - A in. Sanitary Napkin 1 has a length direction, a width direction, and a thickness direction. On the length 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. On 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. Figure 1 The center line C - C shown in etc. represents the center in the width direction of Sanitary Napkin 1, and the center line CL represents the center in the length direction of Sanitary Napkin 1. Figure 3 The cross-sectional views such as etc. schematically show Sanitary Napkin 1, and the dimensions are not necessarily correct.

[0082] Sanitary Napkin 1 has an absorbent body 10, a topsheet 21, a pair of side sheets 23, and a backsheet 31. Optionally, in the region closer to the skin side than the absorbent body 10, a sheet-like second sheet 22 is provided at a position closer to the non-skin side than the topsheet 21. The respective raw materials adjacent to each other in the thickness direction are joined by an adhesive such as hot melt adhesive.

[0083] Sanitary Napkin 1 has a pair of wing portions 1W that project outward in the width direction at the central portion in the length direction. The wing portions 1W are mainly formed by the side sheets 23 and the backsheet 31. Additionally, a structure not necessarily having the wing portions 1W is also possible.

[0084] The topsheet 21 is a liquid-permeable sheet located on the skin side of the absorbent body 10. The topsheet 21 is a surface sheet located on the skin side of the absorbent body 10 and capable of coming into contact with the skin of the wearer. Examples of the topsheet 21 include non-woven fabrics formed of synthetic fibers such as polyethylene (PE) and polypropylene (PP) (e.g., thermal-bonded non-woven fabrics, spunbond non-woven fabrics, etc.), synthetic resin films having through-holes, non-woven fabric sheets formed of cotton, and other soft sheets. The topsheet 21 of the present embodiment is formed of a liquid-permeable sheet of a thermal-bonded non-woven fabric or a hydroentangled non-woven fabric containing polyethylene terephthalate (PET) and polyethylene (PE), or water-retaining fibers such as cotton and rayon.

[0085] A pair of side sheets 23 are provided at a position on the non-skin side of the topsheet 21 and the second sheet 22 and on the skin side of the absorbent body 10, and are sheets extending outward from both side portions in the width direction of the topsheet 21 and the like. Examples of the side sheets 23 include the same soft liquid-permeable non-woven fabrics as the topsheet 21, hydrophobic non-woven fabrics, and the like. In addition, a reinforcing sheet 24 for strengthening the strength of the side sheet 23 is provided at a position outside the topsheet 21, the second sheet 22, and the absorbent body 10 in the width direction and between the side sheet 23 and the bottom sheet 31 in the thickness direction. Examples of the reinforcing sheet 24 include the same sheet members as the bottom sheet 31, paper, SMS, and other sheet members.

[0086] The bottom sheet (non-skin side sheet) 31 is a sheet located on the non-skin side of the absorbent body 10 and provided at the outermost non-skin side position of the sanitary napkin 1. Examples of the bottom sheet 31 include liquid-impermeable sheets such as resin films of polyethylene (PE). The shape of the bottom sheet 31 is substantially the same as the outer shape of the sanitary napkin 1.

[0087] A plurality of main body adhesive portions (adhesive portions) 32 are provided on the non-skin side surface of the bottom sheet 31. The main body adhesive portions 32 of the present embodiment are a plurality of strip-shaped regions coated with a hot melt adhesive along the length direction. When wearing the sanitary napkin 1, by pasting the main body adhesive portions 32 to the inner side of the crotch portion of the underwear (clothing), the sanitary napkin 1 can be prevented from being displaced relative to the body of the wearer.

[0088] The wing portion 1W has a wing adhesive portion 33 on the non-skin side surface of the bottom sheet 31. The wing adhesive portion 33 of the present embodiment is a rectangular region coated with a hot melt adhesive. When wearing the sanitary napkin 1, by folding the wing portion 1W back to the non-skin side surface of the underwear and pasting the wing adhesive portion 33 to the non-skin side surface of the crotch portion of the underwear, the sanitary napkin 1 can be fixed to the underwear.

[0089] At a position overlapping with the wing adhesive portion 33 in the length direction (refer to Figure 1) is the crotch region CA. The crotch region CA is the region that abuts against the wearer's crotch in the longitudinal direction in the worn state, and is the region that abuts against the excretory orifice of the wearer where excrement is discharged.

[0090] The absorbent body 10 has an absorbent core 11 and a core wrapping sheet 12. The absorbent core 11 is formed by shaping liquid-absorbing fibers into a predetermined shape. As the liquid-absorbing fibers, it has shredded fibers. The shredded fibers contain hardwood fibers formed from hardwood trees. The absorbent core 11 of the present embodiment contains shredded fibers (pulp fibers), and as the shredded fibers, it is formed only of hardwood fibers (100% hardwood fibers). In addition, the absorbent core 11 is not limited to shredded fibers formed of hardwood fibers. The shredded fibers may also include pulp fibers such as softwood fibers formed from softwood trees in addition to hardwood fibers, and the absorbent core 11 may also include liquid-absorbing fibers such as cellulose-based absorbent fibers, synthetic fibers formed from polyolefins, polyesters, acrylics, acrylates, etc., and superabsorbent polymers (SAP). Figure 4A is a top view of the absorbent core 11. Figure 4B is Figure 4A a schematic cross-sectional view taken along the line J-J in Figure 5 is Figure 4A an enlarged schematic view of the cross-section taken along the line K-K in Figure 6 is Figure 3 an enlarged view of the absorbent body 10 in Figure 4A , Figure 4B and Figure 5 the concavities and convexities formed by compression parts such as the compression part EL are omitted from the illustration.

[0091] The absorbent core 11 has a middle-high part 11d with a higher unit area weight of liquid-absorbing fibers than the surroundings. The middle-high part 11d is the part where the thickness of the absorbent core 11 is thicker than the surroundings (longer in the thickness direction). In the present embodiment, the middle-high part 11d is the part that protrudes toward the skin side in the thickness direction and is a region that is substantially elliptical in plan view. By providing the middle-high part 11d at the central part in the width direction of the absorbent core 11 and at a position that overlaps with the crotch region CA in plan view, it is easy to abut against the excretory orifice of the wearer in the worn state, it is easy to make the sanitary napkin 1 fit to the wearer's body, and it is easy to quickly absorb excrement. In addition, by having the middle-high part 11d with a higher unit area weight of liquid-absorbing fibers at a position that overlaps with the crotch region CA in plan view, it is easy to hold the excrement discharged from the excretory orifice of the wearer in the absorbent core 11 in the worn state.

[0092] The core wrapping sheet 12 is a liquid-permeable sheet member. The core wrapping sheet 12 of the present embodiment is a thin paper having cellulose fibers. The core wrapping sheet 12 maintains the shape of the absorbent core 11 or promotes the diffusion of liquid to the absorbent core 11 by covering the absorbent core 11.

[0093] As shown in Figure 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 Figure 6 etc., by folding back both end portions of the core wrap sheet 12 toward 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 by the core wrap sheet 12. Specifically, the core wrap sheet 12 wraps the absorbent core 11 in such a manner that the top end 12ea along the length direction of the core wrap sheet 12 is on the outside and the other top end 12eb along the length direction is on the inside 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 two sheet members and they may be respectively arranged on the skin side and the non-skin side of the absorbent core 11. In addition, no adhesive is provided inside the core wrap sheet 12 of the present embodiment. That is, the absorbent core 11 is not fixed by an adhesive between the absorbent core 11 and the core wrap sheet 12, and the absorbent core 11 maintains its shape by being wrapped by the core wrap sheet 12.

[0094] Figure 7 FIG. 10 is a plan view of the absorbent body 10 as viewed from the skin side. In Figure 7 , the mid-height portion 11d of the absorbent core 11 is omitted from the illustration. As shown in Figure 7 , the absorbent body 10 has a central compression portion 14 and a plurality of absorbent body compression portions 15. The central compression portion 14 and the absorbent body compression portions 15 are portions formed by compressing the absorbent core 11 and the core wrap sheet 12 in the thickness direction, respectively.

[0095] The central compression portion 14 and the absorbent body compression portions 15 are formed, for example, by passing the absorbent body 10 during the manufacturing process through the roll gap between a convex roll having a plurality of convex portions and an anvil roll with a flat surface to compress it. The central compression portion 14 and the absorbent body compression portions 15 of the present embodiment are portions formed by pressing the absorbent body 10 from the non-skin side toward the skin side with the convex roll in contact with the non-skin side surface of the absorbent body 10 and the anvil roll in contact with the skin side surface through the roll gap.

[0096] The central compression portion 14 is a linear compression portion that extends along the length direction and is provided at the central portion in the width direction. The central compression portion 14 is a portion that is recessed in the thickness direction from the skin side or the non-skin side within the range from the front end to the rear end of the absorbent body 10. The central compression portion 14 is a guiding portion that guides the absorbent body 10 to bend toward the skin side in the thickness direction starting from the central compression portion 14. In addition, since the central compression portion 14 has a higher fiber density than the uncompressed portion, it is also a guiding portion that guides excrement along the length direction by capillary action.

[0097] The absorber compression part 15 is a compression part arranged in a substantially staggered pattern over the entire area of the absorber 10. The absorber compression part 15 of the present embodiment is provided with a plurality of elliptical compression parts. The absorber compression part 15 is also a part that is recessed in the thickness direction from the skin side or the non-skin side, just like the central compression part 14. By providing the absorber compression part 15, it is easy to maintain the shape of the absorber 10. In addition, the absorber compression part 15 is a part with a higher fiber density than the uncompressed part, so it becomes a part that is easy to absorb excrement in the absorbent core 11 by capillary action. Due to the density difference between the absorber compression part 15 and the uncompressed part, it is easy to suppress the diffusion of the oil agent Y in the absorbent core 11 described later.

[0098] In addition, as Figure 1 shown, etc., the sanitary napkin 1 has a linear compression part EL and a circular compression part ee.

[0099] The linear compression part EL is a part formed by compressing at least a part of the topsheet 21, the second sheet 22, and the absorber 10 in the thickness direction. The linear compression part EL of the sanitary napkin 1 of the present embodiment has a front compression part Ela provided at a position on the front side of the center line CL in the length direction, a rear compression part ELb provided at a position on the rear side of the center line CL, and a central compression part ELc provided between the front compression part Ela and the rear compression part ELb. By providing the linear compression part EL, the bonding in the thickness direction of each member can be made firm, the fiber density can be increased, and the liquid absorbency can be improved. The linear compression part EL is a linear compression part along the length direction in a top view, and a pair is provided at a predetermined interval in the width direction.

[0100] A plurality of circular compression parts ee are provided at the central part in the width direction and at a position in the length direction overlapping with the crotch region CA. The circular compression part ee is a compression part having a circular shape in a top view, and is a part formed by compressing at least a part of the topsheet 21, the second sheet 22, and the absorber 10 in the thickness direction.

[0101] Since the linear compression part EL and the circular compression part ee are parts formed by flattening the members overlapping in the thickness direction, the fiber density of each member at each compression part is higher than that of the part where the compression part is not provided. The linear compression part EL and the circular compression part ee are formed, for example, by passing the sanitary napkin 1 in the manufacturing process through the roll gap between a convex roll having a plurality of convex parts and an anvil roll with a flat surface to compress it.

[0102] <<<Regarding the diffusion of excrement in the sanitary napkin 1>>>

[0103] Preferably, when wearing an absorbent article such as a sanitary napkin 1, the absorbent article quickly absorbs excretions such as menstrual blood excreted from the vaginal orifice of the wearer and spreads it over a larger area in the absorbent article, so that the excretions are not easily left on the skin side of the absorbent article, reducing the adverse effects and discomfort on the skin of the wearer. In particular, in a sanitary napkin for menstruation, in order to absorb excretions such as menstrual blood with a relatively high viscosity, the absorbability and diffusibility of the excretions are sought. Therefore, conventionally, there have been means such as providing a substance that promotes the diffusion of excretions in the absorbent article. However, when using a substance that promotes the diffusion of excretions, etc., excessive promotion of the diffusion of excretions in the absorbent article may cause the excretions to leak from the absorbent article.

[0104] The sanitary napkin 1 of the present invention is provided with an oil agent Y that promotes the diffusion of excretions in the absorbent core 11. In addition, the absorbent core 11 of the sanitary napkin 1 has comminuted fibers containing hardwood fibers formed from hardwood trees. Moreover, in either the length direction or the width direction, when the absorbent core 11 is divided into three equal parts, it sequentially has a side portion, a central portion, and the other side portion from one side, and the unit area weight of the oil agent Y provided in the central portion is higher than the unit area weight of the oil agent Y provided in the side portion.

[0105] The sanitary napkin 1 of the present embodiment is coated with the oil agent Y in the Figure 1 region Y11 from the skin side of the topsheet 21. Figure 8 It is a plan view showing the region where the oil agent Y is provided. Figure 9 It is a cross-sectional view showing the region where the oil agent Y is provided. In addition, Figure 8 and Figure 9 are schematic views, and for the sake of convenience, the components are shown with some omitted or simplified. In Figure 8 etc., the region where the oil agent Y is provided in the sanitary 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 will also be 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 Y21 will also be referred to as the "surface oil agent existing region Y21"). In addition, in Figure 9 the region where the oil agent Y is provided is indicated by a left downward diagonal line portion, but in Figure 9 the planar arrangement of the oil agent Y is illustrated, and it is not necessarily limited to providing the oil agent Y in the entire region in the thickness direction of each component. For example, the oil agent Y may be provided only in the skin side portion of the absorbent core 11, and not provided in the non-skin side portion of the absorbent core 11.

[0106] As Figure 8As shown, in the length direction of the sanitary napkin 1, the front side portion (one side portion) Ta, the central portion Tb, and the rear side portion (the other side portion) Tc are successively provided from the front side (one side) in the length direction when the absorbent core 11 is divided into three equal parts. Moreover, it has the characteristic that the weight per unit area of the oil agent Y provided in the central portion Tb (the weight of the oil agent Y per unit area) is higher than the weight per unit area of the oil agent provided in the front side portion Ta.

[0107] Alternatively, for the sanitary napkin 1 in which the absorbent core 11 includes broadleaf tree fibers and the oil agent Y, as Figure 8 shown, in the width direction of the sanitary napkin 1, when the absorbent core 11 is divided into three equal parts, the sanitary napkin 1 successively has a left side portion (one side portion) Wa, a central portion Wb, and a right side portion (the other side portion) Wc from one side. Moreover, it has the characteristic that the weight per unit area of the oil agent Y provided in the central portion Wb is higher than the weight per unit area of the oil agent provided in the left side portion Wa. In addition, the left side portion Wa of the sanitary napkin 1 corresponds to the left side of the wearer when worn and is the Figure 8 left side in

[0108] In addition, in Figure 8 the front side portion Ta in the length direction is set as one side portion and the rear side portion Tc is set as the other side portion, but it is not limited to this. The front side portion Ta may be set as the other side portion and the rear side portion Tc may be set as one side portion. Similarly, the left side portion Wa in the width direction is set as one side portion and the right side portion Wc is set as the other side portion, but it is not limited to this. The left side portion Wa may be set as the other side portion and the right side portion Wc may be set as one side portion.

[0109] The region Y11 of the absorbent core 11 of the sanitary napkin 1 of the present embodiment where the oil agent Y is provided is provided in the substantially central portion of the sanitary napkin 1.

[0110] Specifically, in the length direction, most of the region Y11 is provided in the central portion Tb in the length direction, and a part of the oil agent Y is provided in the front side portion Ta in the length direction. The oil agent Y is not provided in the rear side portion Tc in the length direction. In the length direction, the weight per unit area of the oil agent Y provided in the central portion Tb (the weight of the oil agent Y in the central portion Tb / the area of the central portion Tb) is larger than the weight per unit area of the oil agent Y provided in the front side portion Ta (the weight of the oil agent Y in the front side portion Ta / the area of the front side portion Ta). In addition, in the length direction, the weight per unit area of the oil agent Y provided in the central portion Tb (the weight of the oil agent Y in the central portion Tb / the area of the central portion Tb) is larger than the weight per unit area of the oil agent Y provided in the rear side portion Tc (the weight of the oil agent Y in the rear side portion Tc / the area of the rear side portion Tc).

[0111] In the width direction, most of the region Y11 is disposed in the central portion Wb in the width direction, a part of the oil agent Y is disposed in the left side portion Wa in the width direction, and a part of the oil agent Y is disposed in the right side portion Wc in the width direction. In the width direction, the weight per unit area of the oil agent Y disposed in the central portion Wb (the weight of the oil agent Y in the central portion Wb / the area of the central portion Wb) is larger than the weight per unit area of the oil agent Y disposed in the left side portion Wa (the weight of the oil agent Y in the left side portion Wa / the area of the left side portion Wa). Further, in the width direction, the weight per unit area of the oil agent Y disposed in the central portion Wb (the weight of the oil agent Y in the central portion Wb / the area of the central portion Wb) is larger than the weight per unit area of the oil agent Y disposed in the right side portion Wc (the weight of the oil agent Y in the right side portion Wc / the area of the right side portion Wc).

[0112] The sanitary napkin 1 promotes the diffusion of excrement in the central portion more easily than in one side portion in the absorbent core 11 by making the weight per unit area of the oil agent in the central portion in either the length direction or the width direction of the absorbent core 11 higher than the weight per unit area of the oil agent Y in one side portion. Further, the diffusion of excrement in one side portion is more easily suppressed than in the central portion in the absorbent core 11 by making the weight per unit area of the oil agent Y in one side portion in either the length direction or the width direction lower than the weight per unit area of the oil agent Y in the central portion. Further, generally speaking, fibers formed from broad-leaved trees have a shorter fiber length than coniferous tree fibers. Inside the absorbent core 11, the longer the fiber length, the more easily diffusion is promoted. Therefore, by including broad-leaved tree fibers as shredded fibers of the absorbent core 11, the diffusion of excrement in the side portion where the weight per unit area of the oil agent Y is low is more easily suppressed. Moreover, even when the absorbent core 11 includes broad-leaved tree fibers as shredded fibers, by making the weight per unit area of the oil agent in the central portion in either the length direction or the width direction higher than the weight per unit area of the oil agent Y in one side portion, the diffusion of excrement in the central portion of the absorbent core 11 is more easily promoted, and thus the possibility that excrement remains on the surface of the absorbent article during wearing can be reduced.

[0113] Accordingly, by promoting the diffusion of excrement in the central portion of the absorbent core 11 of the sanitary napkin 1, the excrement is less likely to remain on the skin side of the absorbent core 11, and the possibility of adverse effects and discomfort on the skin of the wearer can be reduced while reducing the possibility of excrement leaking to the outside from one end in the length direction or the width direction of the sanitary napkin 1. Further, during wearing, by visually recognizing by the wearer himself / herself the situation where excrement easily diffuses in the central portion of the absorbent core 11 and the situation where excrement does not easily diffuse in one side portion in the length direction or the width direction, the concern that the wearer feels that excrement may leak from the sanitary napkin 1 can be more easily reduced.

[0114] Examples of comminuted fibers include pulp, such as wood pulp obtained from coniferous trees (e.g., southern yellow pine) or broadleaf trees (e.g., eucalyptus), bagasse, kenaf, bamboo, hemp, cotton (e.g., cotton linter), etc.; regenerated cellulose fibers such as rayon fibers; and semi-synthetic fibers such as acetate fibers. Most absorbent articles use coniferous tree fibers (coniferous tree pulp) with relatively long fiber lengths.

[0115] The average fiber length of coniferous tree fibers (coniferous tree pulp) is 2.5 mm, and the average fiber length of broadleaf tree fibers (broadleaf tree pulp) is 0.79 mm. That is to say, the average fiber length of broadleaf tree fibers is shorter than that of coniferous tree fibers. Compared with coniferous tree fibers, broadleaf tree fibers used as comminuted fibers in the absorbent core 11 are less likely to promote the diffusion of excreta (liquids). Therefore, by providing an oil agent Y in the central part in the length direction or width direction of the absorbent core 11 containing broadleaf tree fibers to promote diffusion, and being able to easily suppress the diffusion of excreta on one side part in the length direction or width direction where the unit area weight of the oil agent Y is lower, leakage of excreta can be reduced.

[0116] The comminuted fibers of the absorbent core 11 in the present embodiment are composed only of broadleaf tree fibers (broadleaf tree pulp). That is to say, all the comminuted fibers in the absorbent core 11 are broadleaf tree fibers (100% broadleaf tree fibers). Thus, by using the oil agent Y to promote the diffusion of excreta in the central part in the length direction or width direction of the absorbent core 11, and one side part in the length direction or width direction is a region where the unit area weight of the oil agent Y is lower, and by using broadleaf tree fibers with relatively short average fiber lengths, it is easy to suppress the diffusion of excreta on one side part in the length direction or width direction.

[0117] Alternatively, the comminuted fibers of the absorbent core 11 may also contain coniferous tree fibers (coniferous tree pulp) formed from coniferous trees in addition to broadleaf tree pulp. When the absorbent core 11 contains coniferous tree fibers, it is preferable that the total weight of the broadleaf tree fibers is greater than the total weight of the coniferous tree fibers. By including a relatively large amount of broadleaf tree fibers with relatively short average fiber lengths in the absorbent core 11, it is easy to promote the absorption of excreta in the central part in the length direction or width direction of the absorbent core 11 by the oil agent Y while easily suppressing the diffusion of excreta on one side part in the length direction or width direction of the absorbent core 11.

[0118] The condition of containing broadleaf tree fibers in the comminuted fibers of the absorbent core 11 can be confirmed by well-known methods.

[0119] For example, it can be carried out by the following method.

[0120] First, take out a predetermined weight (0.04 g) of the shredded fibers of the absorbent core 11 of the sanitary napkin 1 as a sample, and hydrolyze the shredded fibers with water (distilled water).

[0121] Next, transfer the sample to a beaker, use a fiber length distribution measuring device (“Valmet FS5” manufactured by Valmet Corporation) to take an image and measure the fiber length. In addition, in this device, the concentration of the sample is automatically adjusted to 15 mmg / L to 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.

[0122] Preferably, it is configured such that the length-weighted average of the shredded fibers in the absorbent core 11 is 50% or more and the fiber length is 1 mm or less. By the absorbent core 11 containing more fibers with shorter fiber lengths, it is possible to less likely cause the diffusion of excrement along the plane of the fibers in the absorbent core 11. Thereby, it is easy to promote the vertical transfer of excrement from the skin side to the non-skin side of the absorbent core 11, and thus it is easy to reduce the possibility of excrement leaking to the outside of the sanitary napkin 1.

[0123] 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 the oil agent Y comes into contact with excrement during wearing, the surface tension of the excrement changes, and it is easy to promote the diffusion of excrement (liquid) in the area coated with the oil agent Y.

[0124] As the oil agent Y, for example, the following materials can be used.

[0125] [Ester of chain hydrocarbon tetrol and at least one fatty acid]

[0126] · UNISTAR H-408BRS, manufactured by NOF Corporation

[0127] Pentaerythritol tetra(2-ethylhexanoate), weight average molecular weight: about 640

[0128] · UNISTAR H-2408BRS-22, manufactured by NOF Corporation

[0129] Mixture of pentaerythritol tetra(2-ethylhexanoate) and neopentyl glycol di(2-ethylhexanoate) (58:42, weight ratio), weight average molecular weight: about 520

[0130] [Ester of chain hydrocarbon triol and at least one fatty acid]

[0131] · Glycerol tricaprylate, manufactured by NOF Corporation

[0132] A triester of glycerol and fatty acids containing fatty acids of C8:C10:C12 in a weight ratio of approximately 37:7:56, weight average molecular weight: approximately 570

[0133] · Tri-CL oil fatty acid glyceride, manufactured by NOF Corporation

[0134] A triester of glycerol and fatty acids containing fatty acids of C8:C12 in a weight ratio of approximately 44:56, weight average molecular weight: approximately 570

[0135] · PANACET 810s, manufactured by NOF Corporation

[0136] A triester of glycerol and fatty acids containing fatty acids of C8:C10 in a weight ratio of approximately 85:15, weight average molecular weight: approximately 480

[0137] · PANACET 800, manufactured by NOF Corporation

[0138] A triester of glycerol and fatty acids where all fatty acids are octanoic acid (C8), weight average molecular weight: approximately 470

[0139] · PANACET 800B, manufactured by NOF Corporation

[0140] A triester of glycerol and fatty acids where all fatty acids are 2-ethylhexanoic acid (C8), weight average molecular weight: approximately 470

[0141] · NA36, manufactured by NOF Corporation

[0142] A triester of glycerol 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: approximately 880

[0143] · Tri-coconut oil fatty acid glyceride, manufactured by NOF Corporation

[0144] A triester of glycerol 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

[0145] · Dioctanoin, manufactured by NOF Corporation

[0146] A diester of glycerol and fatty acids where the fatty acid is octanoic acid, weight average molecular weight: 340

[0147] [Ester of a chain hydrocarbon diol and at least one fatty acid]

[0148] ·UNISTAR H-208BRS, manufactured by NOF Corporation

[0149] Neopentyl glycol di(2-ethylhexanoate), weight average molecular weight: about 360

[0150] ·COMPOL BL, manufactured by NOF Corporation

[0151] Dodecanoic acid (C12) monoesters of butanediol, weight average molecular weight: about 270

[0152] ·COMPOL BS, manufactured by NOF Corporation

[0153] Octadecanoic acid (C18) monoesters of butanediol, weight average molecular weight: about 350

[0154] [Compound having 2 to 4 hydroxyl groups of hydrogen atoms of a chain hydrocarbon moiety and a substituted chain hydrocarbon moiety]

[0155] [Ether of a compound having 1 hydroxyl group of hydrogen atoms of a chain hydrocarbon moiety and a substituted chain hydrocarbon moiety]

[0156] [Carboxylic acid, hydroxy acid, alkoxy acid or oxo acid having 2 to 4 carboxyl groups of hydrogen atoms of a chain hydrocarbon moiety and a substituted chain hydrocarbon moiety]

[0157] [Ester of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having 3 carboxyl groups and at least 1 aliphatic monohydric alcohol]

[0158] ·Tributyl O-acetylcitrate, manufactured by Tokyo Chemical Industry Co., Ltd.

[0159] Weight average molecular weight: about 400

[0160] ·Tributyl citrate, manufactured by Tokyo Chemical Industry Co., Ltd.

[0161] Weight average molecular weight: about 360

[0162] [Ester of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid or oxo acid having 2 carboxyl groups and at least 1 aliphatic monohydric alcohol]

[0163] ·Dioctyl adipate, manufactured by Wako Pure Chemical Industries, Ltd.

[0164] Weight average molecular weight: about 380

[0165] [Compound having a chain hydrocarbon moiety and a 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]

[0166] [Ester of a fatty acid and an aliphatic monohydric alcohol]

[0167] · ELECTOL WE20, manufactured by NOF Corporation

[0168] Ester of dodecanoic acid (C12) and dodecanol (C12), weight-average molecular weight: about 360

[0169] · ELECTOL WE40, manufactured by NOF Corporation

[0170] Ester of tetradecanoic acid (C14) and dodecanol (C12), weight-average molecular weight: about 390

[0171] [Polyoxy C3-C6 alkylene glycol, or its alkyl ester or alkyl ether]

[0172] [Polyoxy C3-C6 alkylene glycol]

[0173] · UNIOL PB500, manufactured by NOF Corporation

[0174] Polybutylene glycol, weight-average molecular weight: about 500

[0175] · UNIOL PB700, manufactured by NOF Corporation

[0176] Polyoxybutylene polyoxypropylene glycol, weight-average molecular weight: about 700

[0177] [Linear hydrocarbon]

[0178] · PARLEAM 6, manufactured by NOF Corporation

[0179] Branched hydrocarbon formed by copolymerizing liquid isoparaffin, isobutene and 1-butene and then adding hydrogen, degree of polymerization: about 5 - about 10, weight-average molecular weight: about 330

[0180] [Others]

[0181] · NA50, manufactured by NOF Corporation

[0182] Triglyceride of glycerol and fatty acid obtained by adding hydrogen to NA36 to reduce the ratio of double bonds derived from unsaturated fatty acids as raw materials, weight-average molecular weight: about 880

[0183] · Monoglyceride of (caprylic acid / capric acid), manufactured by NOF Corporation

[0184] Monoglyceride of glycerol and fatty acid containing caprylic acid (C8) and capric acid (C10) in a weight ratio of approximately 85:15, weight-average molecular weight: about 220

[0185] · Monomuls 90-L2 monolaurin, manufactured by Cognis Japan

[0186] · Isopropyl citrate, manufactured by Tokyo Chemical Industry Co., Ltd.

[0187] Weight-average molecular weight: about 230

[0188] · Diisostearyl malate

[0189] Weight-average molecular weight: about 640

[0190] · UNIOL PB1000R, manufactured by NOF Corporation

[0191] Polybutylene glycol, weight-average molecular weight: about 1000

[0192] · UNIOL D-250, manufactured by NOF Corporation

[0193] Polypropylene glycol, weight-average molecular weight: about 250

[0194] · UNIOL D-400, manufactured by NOF Corporation

[0195] Polypropylene glycol, weight-average molecular weight: about 400

[0196] · UNIOL D-700, manufactured by NOF Corporation

[0197] Polypropylene glycol, weight-average molecular weight: about 700

[0198] · UNIOL D-1000, manufactured by NOF Corporation

[0199] Polypropylene glycol, weight-average molecular weight: about 1000

[0200] · UNIOL D-1200, manufactured by NOF Corporation

[0201] Polypropylene glycol, weight-average molecular weight: about 1160

[0202] · UNIOL D-2000, manufactured by NOF Corporation

[0203] Polypropylene glycol, weight-average molecular weight: about 2030

[0204] · UNIOL D-3000, manufactured by NOF Corporation

[0205] Polypropylene glycol, weight-average molecular weight: about 3000

[0206] · UNIOL D-4000, manufactured by NOF Corporation

[0207] Polypropylene glycol, weight-average molecular weight: about 4000

[0208] · PEG1500, manufactured by NOF Corporation

[0209] Polyethylene glycol, weight-average molecular weight: about 1500 to about 1600

[0210] · WILBRITE cp9, manufactured by NOF Corporation

[0211] A compound in which the OH groups at both ends of polybutylene glycol are esterified with hexadecanoic acid (C16), weight-average molecular weight: about 1150

[0212] · UNILUBE MS-70K, manufactured by NOF Corporation

[0213] Stearyl ether of polypropylene glycol, about 15 repeating units, weight-average molecular weight: about 1140

[0214] · NONION S-6, manufactured by NOF Corporation

[0215] Polyoxyethylene monostearate, about 7 repeating units, weight-average molecular weight: about 880

[0216] · UNILUBE 5TP-300KB

[0217] Polyoxyethylene polyoxypropylene pentaerythritol ether formed by adding 5 moles of ethylene oxide and 65 moles of propylene oxide to 1 mole of pentaerythritol, weight-average molecular weight: 4130

[0218] · WILBRITE s753, manufactured by NOF Corporation

[0219] Polyoxyethylene polyoxypropylene polyoxybutylene glycerol, weight-average molecular weight: about 960

[0220] · UNIOL TG-330, manufactured by NOF Corporation

[0221] Glycerol ether of polypropylene glycol, about 6 repeating units, weight-average molecular weight: about 330

[0222] · UNIOL TG-1000, manufactured by NOF Corporation

[0223] Glycerol ether of polypropylene glycol, about 16 repeating units, weight-average molecular weight: about 1000

[0224] · UNIOL TG-3000, manufactured by NOF Corporation

[0225] Glycerol ether of polypropylene glycol, about 16 repeating units, weight-average molecular weight: about 3000

[0226] · UNIOL TG-4000, manufactured by NOF Corporation

[0227] Glycerol ether of polypropylene glycol, about 16 repeating units, weight-average molecular weight: about 4000

[0228] ·UNILUBE DGP-700, manufactured by Nippon Oil Corporation

[0229] Diglycerol ether of polypropylene glycol, about 9 repeating units, weight-average molecular weight: about 700

[0230] ·UNIOX HC60, manufactured by Nippon Oil Corporation

[0231] Polyoxyethylene hydrogenated castor oil, weight-average molecular weight: about 3570

[0232] ·Vaseline, manufactured by Cognis Japan

[0233] Hydrocarbon derived from petroleum, semi-solid

[0234] Comparison of the unit area weight of Oil Agent Y can be carried out by well-known methods. For example, a reagent corresponding to the Oil Agent Y used can be applied, and comparison can be made based on color change and shade.

[0235] The sanitary napkin 1 of the present embodiment uses PANACET 810S (triglyceride, manufactured by Nippon Oil Corporation) as Oil Agent Y. This Oil Agent Y is an oil agent containing unsaturated fatty acids, which can promote excrement, or impart unsaturated fatty acids to the skin of the wearer to improve skin touch, or protect the skin of the wearer.

[0236] For this Oil Agent Y, the leakage color-developing inspection agent "Moraymille OiL (manufactured by Taseto Co., Ltd.)" can be used to compare the presence and unit area weight of Oil Agent Y.

[0237] Specifically, the absorbent core 11 is taken out from the sanitary napkin 1, and the above-mentioned leakage color-developing inspection agent is sprayed over the entire area of the absorbent core 11. If this leakage color-developing inspection agent is applied, the part where oil (Oil Agent Y) exists appears red. The area that does not appear red is not coated with Oil Agent Y, and the unit area weight of Oil Agent Y is 0 (zero). On the other hand, in the area that appears red, by comparing the shade of red, the unit area weight of Oil Agent Y in each part can be compared.

[0238] In the length direction and width direction of the sanitary napkin 1 of the present embodiment, the weight per unit area of the oil agent Y provided at the central portion is higher than that of the oil agent Y provided at one side portion. That is to say, the weight per unit area of the oil agent Y provided at the central portion Tb is higher than that of the oil agent provided at the front side portion Ta, and the weight per unit area of the oil agent Y provided at the central portion Wb is higher than that of the oil agent provided at the left side portion Wa. Thus, the central portions in the length direction and width direction of the absorbent core 11 (the portion that is the central portion Tb and the central portion Wb) are the portions that are likely to come into contact with the excretion ports such as the vaginal orifice of the wearer during wearing. Therefore, due to the relatively high weight per unit area of the oil agent Y at the central portions in the length direction and width direction of the absorbent core 11, it is easy to promote the rapid absorption of the excretions excreted during wearing and the diffusion of the excretions. On the other hand, since it is easy to suppress the diffusion at the one side portions Ta and Wa in the length direction and width direction of the absorbent core 11 respectively, the possibility of leakage of excretions from the outer sides of the front side (one side) in the length direction and the left side (one side) in the width direction of the sanitary napkin 1 can be reduced.

[0239] It is also preferable that the oil agent Y is not provided at the outer end portions of the front side portion (one side portion) Ta in the length direction and the left side portion (one side portion) Wa in the width direction of the absorbent core 11. Thus, it is easy to suppress the diffusion of excretions at the outer end portions of the front side portion (one side portion) Ta in the length direction and the left side portion (one side portion) Wa in the width direction of the absorbent core 11, and the possibility of leakage of excretions from the outer sides of the front side (one side) in the length direction and the left side (one side) in the width direction of the sanitary napkin 1 can be reduced. In addition, the outer end portion of the front side portion (one side portion) Ta in the length direction of the absorbent core 11 is a portion having a length of 10 mm from the front end in the length 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.

[0240] It is also preferable that the sanitary napkin 1 has a linear compression portion (compression portion) EL formed by compressing the absorbent core 11 in the thickness direction. As described above, the linear compression portion EL of the sanitary napkin 1 has a rear compression portion ELb at a position behind the central line CL in the length direction Figure 1)。In such a case, preferably, the rear end of the region (region Y11) provided with the oil agent Y is provided at a position closer to the front side than the front end of the rear compression portion ELb. The linear compression portion EL and the rear compression portion ELb are portions where the fiber density is higher than that of the surroundings, and are portions where it is easy to promote the diffusion of excrement through capillary action. Therefore, by providing the oil agent Y at a position closer to the front side than the front end of the rear compression portion ELb, it is easy to suppress the diffusion at the rear of the absorbent core 11, and the possibility of leakage of excrement to the outside of the rear side of the sanitary napkin 1 can be reduced.

[0241] As described above, there is a core wrapping sheet 12 that covers the absorbent core 11. The average fiber length of the fibers in the skin-side portion 12a (core wrapping sheet) of the core wrapping sheet 12, which is located on the skin side with respect to the absorbent core 11, is preferably equal to or greater than the average fiber length of the crushed fibers of the absorbent core 11. Thus, compared with the case where the average fiber length of the fibers in the skin-side portion 12a is shorter than the average fiber length of the crushed fibers of the absorbent core 11, it is easier to promote the absorption and diffusion of excrement in the skin-side portion 12a during wearing. Therefore, by allowing the excrement to spread flatly in the skin-side portion 12a and then vertically transferring the excrement to the absorbent core 11 located on the non-skin side with respect to the skin-side portion 12a, it is easier to promote the penetration of excrement into the absorbent core 11. In addition, the average fiber length of the crushed fibers of the absorbent core 11 and the average fiber length of the fibers in the skin-side portion 12a can be measured by well-known methods. For example, by using the above-described fiber length distribution measuring device (“Valmet FS5” manufactured by Valmet Corporation) to take an image and measure the fiber length.

[0242] The fibers in the skin-side portion 12a (core wrapping sheet) can be taken out, for example, by the following method.

[0243] First, decompose the sanitary napkin 1 using toluene and take out the core wrapping sheet 12.

[0244] Dry the taken-out core wrapping sheet.

[0245] Then, put 15 g of the core wrapping 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 wrapping sheet) into a plastic container (inner diameter: 120 mm, height: 220 mm), and stir with a stirrer (EYELA MAZELA Z manufactured by Tokyo Rika Kikai Co., Ltd.) at room temperature for about 24 hours. At this time, stir slowly so that the fibers do not break.

[0246] After that, suck up the fibers dispersed in the water together with the water using a straw (aperture: 2 mm to 3 mm).

[0247] Collect the taken-out fibers by suction filtration and dry them.

[0248] The fiber length of the extracted fibers is measured using an electron microscope, and the average fiber length is calculated based on the measured fiber length.

[0249] The skin-side part (core wrapping sheet) 12a of the core wrapping sheet 12 located on the skin side of the absorbent core 11 ( Figure 6 ) Preferably, no adhesive is provided between the skin side of the absorbent core 11 and the non-skin side of the skin-side part 12a. That is, preferably, the skin side of the absorbent core 11 and the skin-side part 12a are not bonded with an adhesive. The oil agent Y for promoting excrement not only mixes with excrement but also has a high possibility of mixing with the adhesive. If an adhesive is provided between the skin side of the absorbent core 11 and the non-skin side of the skin-side part 12a, then in the state before wearing the sanitary napkin 1 (before absorbing excrement), the oil agent Y mixes with the adhesive at the skin-side part 12a, causing the oil agent Y to spread to an unexpected range of the skin-side part 12a. In this case, when wearing the sanitary napkin 1 and absorbing excrement, the excrement that spreads flatly at the skin-side part 12a moves toward the non-skin side to the absorbent core 11 and spreads excessively within a large range in the absorbent core 11, and there is a possibility that the excrement leaks from the sanitary napkin 1. In contrast, by not providing an adhesive between the skin side of the absorbent core 11 and the non-skin side of the skin-side part 12a, it is possible to prevent the diffusion of the oil agent Y caused by the mixing of the oil agent Y and the adhesive at the skin-side part 12a, reduce the possibility of excessive diffusion of excrement at the absorbent core 11 during wearing, and reduce the possibility of excrement leaking to the outside of the sanitary napkin 1.

[0250] Preferably, no adhesive is provided between the non-skin side of the absorbent core 11 and the non-skin-side part (core wrapping sheet) 12b located on the non-skin side of the absorbent core 11. That is, preferably, the non-skin side of the absorbent core 11 and the non-skin-side part 12b are not bonded with an adhesive. Similar to the skin side of the absorbent core 11 (skin-side part 12a), by preventing the mixing of the oil agent Y and the adhesive and reducing the possibility of excessive diffusion of the oil agent Y at the non-skin-side part 12b, it is possible to reduce the possibility that the excrement that spreads flatly at the non-skin-side part 12b moves to the absorbent core 11 and spreads excessively within a large range in the absorbent core 11. Thereby, the possibility of excrement leaking to the outside of the sanitary napkin 1 can be reduced.

[0251] As Figure 2As shown in the figure, the sanitary napkin 1 has a main body adhesive portion 32 on the non-skin side of the bottom sheet 31 located at the position closest to the non-skin side. The main body adhesive portion 32 is provided to fix the sanitary napkin 1 to the wearer's clothing during wearing. When observing the sanitary napkin 1 in the thickness direction, there are an overlapping area 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 area n32 where the portion of the absorbent core 11 not provided with the oil agent Y overlaps with the main body adhesive portion 32. The sanitary napkin 1 of the present embodiment is as Figure 2 shown. The rectangular area Y11 is the area of the absorbent core 11 provided with the oil agent Y, and the main body adhesive portion 32 provided inside the area Y11 is the overlapping area y32. Moreover, the main body adhesive portion 32 provided outside the area Y11 is the non-overlapping area n32. In such a case, it is preferable that the adhesive strength of the main body adhesive portion 32 at the overlapping area y32 is lower than the adhesive strength of the main body adhesive portion 32 at the non-overlapping area n32. In addition, the adhesive strength is the strength of the force for fixing the sanitary napkin 1 and the clothing, and is also the strength of the force for peeling off the sanitary napkin 1 fixed to the sanitary napkin 1. In addition, the main body adhesive portion 32 of the sanitary napkin 1 is intermittently arranged in the width direction at both sides in the left-right direction, and there are 5 linear adhesive coating areas ( Figure 2 the right downward diagonal line portion in the figure), but substantially, the adhesive coating areas function as an adhesive portion due to the infiltration of the adhesive, etc. Therefore, the main body adhesive portion 32 of the sanitary napkin 1 is a rectangular area provided at both sides in the left-right direction and surrounded by the outer ends of the adhesive coating areas.

[0252] The overlapping area y32 in the sanitary napkin 1 is a portion where the adhesive of the main body adhesive portion 32 is likely to be mixed with the oil agent Y. Since the adhesive is mixed with the oil agent Y, the adhesive strength is likely to decrease. In particular, when using a breathable film that does not allow liquid to pass through but allows gas to pass through as the bottom sheet 31, the oil agent Y provided in the absorbent core 11 is likely to be mixed with the main body adhesive portion 32 through the bottom sheet 31. Therefore, by including a portion with a locally higher adhesive strength and a portion with a locally lower adhesive strength in the main body adhesive portion 32 of the sanitary napkin 1, it is possible to ensure the fixing strength to the clothing while reducing the possibility of the adhesive strength becoming excessively strong. In the absorbent core 11 of the used sanitary napkin 1, especially the portion provided with the oil agent Y contains a large amount of body fluid and is likely to kink and deform. When removing the sanitary napkin 1 having the absorbent core 11 from the clothing, since there is the overlapping area y32 with a lower adhesive strength, the sanitary napkin 1 can be removed from the clothing with a smaller force. Therefore, the shape of the absorbent core 11 at the overlapping area y32 is not likely to be deformed, and it is easy to perform operations such as rolling up the removed sanitary napkin 1, and it is easy to discard.

[0253] The adhesive strength of the main body adhesive part 32 in each region (the overlapping region y32 and the non-overlapping region n32) can be measured by well-known methods.

[0254] For example, by measuring the force required to peel the main body adhesive part 32 through a peel test (JIS Z0237), the adhesive strength can be compared. Specifically, first, the overlapping region y32 and the non-overlapping region n32 of the sanitary napkin 1 are cut into sample pieces of a predetermined size (10 mm × 10 mm) respectively.

[0255] Then, each sample piece is pasted on the test plate, and the end of the sample piece is grasped and peeled. A load cell is used to measure the peeling load at this time. This measurement is performed multiple times for each sample.

[0256] 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 part 32 can be calculated.

[0257] Adhesive strength [N / 10 mm] = (Load [N] × 10) / (Width of the sample piece)

[0258] Based on the calculated adhesive strength [N / 10 mm] of each sample piece, the adhesive strength can be compared.

[0259] In addition, the test plate can be a SUS304 steel plate specified in JIS Z0237, or a plate formed by fixing a 100% cotton sheet member or a 100% polyester sheet member to a horizontal plate when other uses are envisaged.

[0260] The sanitary napkin 1 is circulated, sold, stored, etc. in a state of being folded at one or more folding parts F. The folding part F is a folding line along the width direction. In the sanitary napkin 1, a front folding part F1 is provided at a position on the front side of the center line CL in the length direction, and a rear folding part F2 is provided at a position on the rear side of the center line CL. The sanitary napkin 1 is folded with the skin side as the inner side at the folding parts F1 and F2 respectively. Figure 1 The sanitary napkin 1 shown in etc. shows an unfolded state in which all the folding parts F are unfolded. In the sanitary napkin 1 in this unfolded state, preferably, the oil agent Y is provided across the folding part F in the length direction. Specifically, as Figure 1As shown, the region Y11 where the oil agent Y is provided in the absorbent core 11 is provided across the front-side folding portion F1. That is, in a plan view, the front-side folding portion F1 is provided at a position overlapping with the region Y11. In the front-side folding portion F1 (folding portion F), the density of the fibers of the absorbent core 11 tends to increase. Since the front-side folding portion F1 extends along the width direction, excrement reaching the front-side folding portion F1 during wearing is likely to spread outward in the width direction along the front-side folding portion F1. Therefore, by arranging the region Y11 where the oil agent Y is provided in the absorbent core 11 to cross the front-side folding portion F1, when excrement reaches the front-side folding portion F1 during wearing, it is easy to promote the spread of excrement in the length direction by using the oil agent Y in the region Y11. Thereby, the possibility of leakage of excrement to the outside in the width direction of the sanitary napkin 1 can be reduced.

[0261] It is also 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, during wearing, it is easy to move excrement absorbed from the skin side surface of the sanitary napkin 1 from the skin side to the non-skin side of the absorbent core 11.

[0262] As described above, the topsheet 21 of the sanitary napkin 1 is a sheet material that can come into contact with the skin of the wearer. Preferably, an oil agent Y is also provided on the topsheet 21, and there is a region Y21 where the oil agent Y is provided on the topsheet 21. Moreover, preferably, when viewed in the thickness direction, in the topsheet 21, the unit area weight of the oil agent Y provided in the portion overlapping with the central portion Tb, Wb in the length direction or the width direction is higher than the unit area weight provided in the portion overlapping with the side portion Ta, Wa in the length direction or the width direction. In the manufacturing process of the sanitary napkin 1 of the present embodiment, the oil agent Y is applied from the skin side of the topsheet 21 in a state where the topsheet 21 and the absorber 10 are overlapped. Then, the oil agent Y infiltrated from the topsheet 21 remains in and is held by the absorbent core 11. In addition to the absorbent core 11, the oil agent Y is also provided on the topsheet 21. By making the unit area weight of the oil agent Y provided in the portion overlapping with the central portion Tb, Wb in the length direction or the width direction in the topsheet 21 higher than the unit area weight provided in the portion overlapping with the side portion Ta, Wa in the length direction or the width direction, it is easy to promote the diffusion of excrement in the portion of the topsheet 21 overlapping with the central portion Tb, Wb in the length direction or the width direction. As a result, when viewed in the thickness direction, after the excrement diffuses to a certain extent in the portion of the topsheet 21 overlapping with the central portion Tb, Wb in the length direction or the width direction, the excrement moves to the non-skin side, and it is easy to absorb the excrement in a larger range of the central portion Tb, Wb in the length direction or the width direction of the absorbent core 11. Therefore, it is easy to accelerate the absorption of excrement by the sanitary napkin 1. Thus, it is easy to promote the absorption of excrement in the central portion Tb, Wb of the absorbent core 11 by the oil agent Y while suppressing the diffusion of excrement in the side portion Ta, Wa in the length direction or the width direction of the absorbent core 11.

[0263] In addition, when the oil agent Y is provided on the topsheet 21 of the sanitary napkin 1, preferably, as Figure 9 shown, 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 at a position outside the absorbent core 11 in the width direction. Thereby, it is easy to suppress the diffusion of excrement at the end in the width direction of the absorbent core 11, and the possibility of excrement leaking from the outside in the width direction of the sanitary napkin 1 can be reduced.

[0264] When the oil agent Y is provided on the topsheet 21 of the sanitary napkin 1, preferably, as Figure 9As shown, the length W21 of the topsheet 21 in the width direction is longer than the length W11 of the absorbent core 11 in the width direction (W21 > W11). Moreover, the absorbent core 11 has a core oil agent presence area Y11 provided with the oil agent Y and a core oil agent absence area N11 not provided with the oil agent Y. The topsheet 21 has a surface oil agent presence area Y21 provided with the oil agent Y and a surface oil agent absence area N21 not provided with the oil agent Y. Preferably, there is a first region R1 where the core oil agent presence area Y11 and the surface oil agent presence area Y21 overlap in the thickness direction of the sanitary napkin 1, a second region R2 where the core oil agent absence area N11 and the surface oil agent presence area Y21 overlap in the thickness direction of the sanitary napkin 1, and a third region R3 where the surface oil agent absence area and the absorbent core do not overlap in the thickness direction of the sanitary napkin 1. Moreover, preferably, as Figure 9 shown, the first region R1, the second region R2, and the third region R3 are arranged in the order of the first region R1, the second region R2, and the third region R3 from the inside to the outside in the width direction. Thereby, during wearing, first, the diffusion of excrement is promoted in the first region R1 of the sanitary napkin 1 while the diffusion of excrement is easily suppressed in the second region R2 and the third region R3. Therefore, the possibility of excrement leaking to the outside in the width direction of the sanitary napkin 1 can be reduced.

[0265] It is also preferable that the core oil agent presence area Y11 has a core oil agent concentrated area Y11k where the unit area weight of the oil agent Y is higher than that of the surroundings in the first region R1, and the surface oil agent presence area Y21 has a surface oil agent diluted area Y21u where the unit area weight of the oil agent Y is lower than that of the surroundings in the first region R1. In such a case, more preferably, when observing the sanitary napkin 1 in the thickness direction, there is a part where the core oil agent concentrated area Y11k and the surface oil agent diluted area Y21u overlap at the central part in the width direction and the central part in the length direction of the first region R1.

[0266] The first region R1 of the topsheet 21 that can come into contact with the skin of the wearer is a part that is likely to come into contact with the excretion opening such as the vaginal orifice during wearing. The excretion opening such as the vaginal orifice is a particularly sensitive part and may be irritated or adversely affected when directly contacting the oil agent Y. In particular, the absorbent core 11 of the present embodiment has a middle-high part 11d protruding toward the skin side at the central part in the length direction and the width direction, so it is more likely to come into contact with the excretion opening such as the vaginal orifice of the wearer.

[0267] On the other hand, the topsheet 21 preferably contains the oil agent Y. Particularly preferably, it promotes the penetration and diffusion of excrement in the topsheet 21 in the first region R1 that overlaps with the core oil agent presence region Y11 when observed in the thickness direction, and prevents the situation where excrement flows on the surface of the topsheet 21 (on the skin side) and the excrement leaks from the sanitary napkin 1. Therefore, by having the surface oil agent dilute region Y21u in the first region R1 in the topsheet 21, the amount of the oil agent Y provided in the part where there is a possibility of direct contact with the wearer's excretory opening is reduced, thereby promoting the penetration and diffusion of excrement in the topsheet 21 and reducing the possibility that the oil agent Y causes irritation and adverse effects on the wearer's excretory opening.

[0268] In addition, by having the core oil agent concentrated region Y11k and the surface oil agent dilute region Y21u in the first region R1 when observed in the thickness direction, and having a part where the core oil agent concentrated region Y11k overlaps with the surface oil agent dilute region Y21u when observed in the thickness direction, it is easier to transfer from the topsheet 21 to the non-skin side than the diffusion in the topsheet 21, and it is easier to promote the absorption and diffusion of excrement in the absorbent core 11 of the core oil agent concentrated region Y11k where the unit area weight of the oil agent Y is higher than the surrounding area. Therefore, it is easy to inhale excrement into the absorbent core 11, and the possibility of excrement spreading and leaking on the surface of the sanitary napkin 1 can be reduced.

[0269] Absorbent articles such as sanitary napkins may also have a structure with a post-treatment tongue piece or a post-treatment band. For example, as Figure 10 shown, the sanitary napkin 100 is a night-use sanitary napkin, and the sanitary napkin 100 is provided with a post-treatment tongue piece 50. Figure 10 This is a top view obtained by observing the sanitary napkin 100 from the non-skin side. The same reference numerals are given to the components of the sanitary napkin 100 that are the same as those of the above-mentioned sanitary napkin 1, and the description thereof is omitted.

[0270] The sanitary napkin 100 has a post-treatment tongue piece 50 on the non-skin side of the sanitary napkin 100, that is, on the non-skin side of the bottom sheet 31. The post-treatment tongue piece 50 is a member used after using the sanitary napkin 100. The post-treatment tongue piece 50 is a strip-shaped film member including a fixing portion fixed to the bottom sheet 31 by an adhesive or the like and a free portion not fixed to the bottom sheet 31. After using the sanitary napkin 100, the post-treatment tongue piece 50 in the state of being elongated in the length direction wraps around the sanitary napkin 100 in the state of being rolled up in the length direction, and the post-treatment tongue piece 50 is attached to the main body bonding portion 32 of the sanitary napkin 100, thereby easily maintaining the rolled-up state of the sanitary napkin 100.

[0271] Preferably, when observing the sanitary napkin 100 in the thickness direction, the after-treatment tongue piece 50 does not overlap with the oil agent Y (region Y11). The absorbent core 11 of the used sanitary napkin 100 uses the oil agent Y to spread excrement, so that the shape of the absorbent core 11 is liable to deform. On the other hand, the part of the absorbent core 11 that does not overlap with the oil agent Y (region Y11) when observed in the thickness direction has less spread of excrement by the oil agent Y compared to the part that overlaps with the oil agent Y (region Y11). Therefore, the shape of the absorbent core 11 is not liable to deform. Thus, by providing the after-treatment tongue piece 50 at the part that does not overlap with the oil agent Y (region Y11) when observed in the thickness direction, when rolling up the used sanitary napkin 100 for disposal, it is easy to roll up the absorbent core 11 in a state where the shape of the absorbent core 11 is prevented from deforming.

[0272] In addition, the sanitary napkin 100 is provided with the after-treatment tongue piece 50, but is not limited thereto. For example, in the case where the absorbent article is a disposable diaper or a panty liner, a post-treatment belt for maintaining the rolled-up state of the used absorbent article may also be provided. The post-treatment belt is a film member in which one end in the length direction of the belt is fixed to the absorbent article and an adhesive portion is provided at the other end in the length direction. By winding the absorbent article in the rolled-up state after use with the post-treatment belt and fixing it with the adhesive portion at the other end of the post-treatment belt, it is easy to maintain the rolled-up state of the absorbent article. The absorbent article provided with such a post-treatment belt is also the same as the after-treatment tongue piece 50. Preferably, the post-treatment belt is provided at a position that does not overlap with the oil agent Y provided in the absorbent core 11 when observed in the thickness direction.

[0273] ===Other Embodiments===

[0274] The embodiments of the present invention have been described above. However, the above embodiments are for facilitating the understanding of the present invention, rather than for limiting the interpretation of the present invention. In addition, it goes without saying that the present invention can be changed and improved without departing from its gist, and equivalents thereof are included in the present invention.

Claims

1. An absorbent article having a length direction, a width direction and a thickness direction which are orthogonal to each other, The absorbent article is provided with an absorbent core having pulverized fibers, wherein: The pulverized fibers include hardwood fibers formed from hardwood trees, The absorbent core is provided with an oil agent for promoting 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 side portion, a central portion, and another side portion in order from one side, The weight per unit area of ​​the oil agent provided in the central portion is higher than the weight per unit area of ​​the oil agent provided in the one side portion.

2. The absorbent article according to claim 1, wherein The pulverized fibers also include conifer fibers formed from coniferous trees. 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, characterized in that: The absorbent article has a surface sheet that can come into contact with the skin of a wearer. The surface sheet is also provided with the oil agent. When viewed in the thickness direction, in the top sheet, the oil agent provided at a portion overlapping the central portion has a higher basis weight than the oil agent provided at a portion overlapping the one side portion.

4. The absorbent article according to claim 1 or 2, characterized in that: The oil agent is an amphiphilic substance.

5. The absorbent article according to claim 1 or 2, characterized in that: A core wrap sheet is provided at a position closer to the skin than the absorbent core, No adhesive is provided between the skin side of the absorbent core and the non-skin side of the core wrap sheet.

6. The absorbent article according to claim 1 or 2, characterized in that: A core wrap sheet is provided at a position closer to the non-skin side than the absorbent core, No adhesive is provided between the non-skin side of the absorbent core and the skin side of the core wrap sheet.

7. The absorbent article according to claim 1 or 2, characterized in that: The non-skin side of the absorbent article is provided with a post-processing tongue or a post-processing belt, The oil agent does not overlap with the post-treatment tongue or the post-treatment tape when viewed in the thickness direction.

8. The absorbent article according to claim 1 or 2, characterized in that: The absorbent article has a non-skin side sheet at a position closest to the non-skin side. The non-skin side of the non-skin side sheet is provided with an adhesive portion, The absorbent article has an overlapping region where the portion provided with the oil agent overlaps with the adhesive portion when viewed in the thickness direction, and a non-overlapping region where the portion not provided with the oil agent overlaps with the adhesive portion when viewed in the thickness direction. 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, characterized in that: The absorbent core has a core wrap sheet on the skin side of the absorbent core. The average fiber length of the fibers of the core wrap sheet is equal to or longer than the average fiber length of the pulverized fibers of the absorbent core.

10. The absorbent article according to claim 1 or 2, characterized in that: 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.

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

12. The absorbent article according to claim 1 or 2, characterized in that: The absorbent article has a surface sheet that can come into contact with the skin of a wearer. 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 existing region where the oil agent is provided and a core oil agent non-existent region where the oil agent is not provided. The surface sheet has a surface oil agent-existing region provided with the oil agent and a surface oil agent-non-existing region not provided with the oil agent. The absorbent article has: a first region in which the core oil agent existing region and the surface oil agent existing region overlap in the thickness direction; a second region in which the core oil agent non-existing region and the surface oil agent existing region overlap in the thickness direction; as well as The surface oil agent-free region and the third region of the absorbent core that do not overlap in the thickness direction, 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.

13. The absorbent article according to claim 12, wherein: The core oil agent existing region has a core oil agent concentrated region in the first region where the weight per unit area of ​​the oil agent is higher than that of the surrounding area, The surface oil agent existing region has a surface oil agent thin region in the first region where the weight per unit area of ​​the oil agent is lower than that of the surrounding area, When viewed in the thickness direction, the first region has a portion where the core oil agent-rich region and the surface oil agent-diluted region overlap in the center of the width direction and in the center of the length direction.

14. The absorbent article according to claim 1 or 2, characterized in that: The absorbent article has a surface sheet that can come into contact with the skin of a wearer. 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 oil agent is not provided at a position outside the absorbent core in the width direction.

15. The absorbent article according to claim 1 or 2, characterized in that: The absorbent article has a compressed portion formed by compressing the absorbent core in the thickness direction. The compression portion includes a rear compression portion at a rear side relative to a center in the longitudinal direction of the absorbent article. The rear end of the oil agent is provided at a front side relative to the front end of the rear side compression portion.

16. The absorbent article according to claim 1 or 2, characterized in that: The weight per unit volume of the oily agent disposed on the skin side relative to the center in the thickness direction of the absorbent core is greater than the weight per unit volume of the oily agent disposed on the non-skin side relative to the center in the thickness direction of the absorbent core.

17. The absorbent article according to claim 1 or 2, characterized in that: The absorbent article has a folded portion along the width direction. The oil agent is provided across the folded portion in the longitudinal direction.

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