Absorbent article

Abstract

The utility model provides an absorptive 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] This utility model relates to an absorbent article. Background Technology

[0002] Absorbent articles such as sanitary napkins are known to absorb excrement. When menstrual blood or other excrement is discharged during wear, it is preferable that the absorbent article quickly absorbs the excrement. For example, Patent Document 1 discloses a sanitary napkin that includes a top sheet that contacts the wearer's skin and an absorbent body located on the non-skin side of the top sheet. In order to promote the absorption of menstrual blood or other excrement that is highly viscous during wear, a blood-lubricating agent is provided on the top sheet, thereby facilitating the transfer of excrement from the top sheet to the absorbent body and reducing the sticky feeling on the skin side of the top sheet.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2013-179982 Utility Model Content

[0006] Problems to be solved by utility models

[0007] However, the sanitary napkin described in Patent Document 1 promotes the absorption of excrement, but on the other hand, excessively promoting the diffusion of excrement in the sanitary napkin may lead to leakage of excrement from the sanitary napkin.

[0008] This invention was made in view of the aforementioned problems, and its purpose is to provide an absorbent article that inhibits the diffusion of excrement on one side of the absorbent article in the length or width direction, and reduces the possibility of excrement leaking outward from one end of the absorbent article in the length or width direction.

[0009] Solution for solving the problem

[0010] The main utility model for achieving the above-mentioned objective is an absorbent article having mutually orthogonal length, width, and thickness directions, and possessing an absorbent core with pulverized fibers. The absorbent article is characterized in that the pulverized fibers include broadleaf tree fibers formed from broadleaf trees, and the absorbent core is provided with an oil that promotes the diffusion of excrement. In either the length or 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 sequence from one side. The weight per unit area of ​​the oil provided in the central portion is higher than that of the oil provided in the side portion.

[0011] Preferably,

[0012] The pulverized fibers also include coniferous fibers formed from coniferous trees.

[0013] The total weight of the broadleaf tree fibers is greater than the total weight of the coniferous tree fibers.

[0014] Preferably,

[0015] This absorbent material has a surface sheet that can come into contact with the wearer's skin.

[0016] The oil is also provided on the surface sheet.

[0017] When viewed along the thickness direction, the weight per unit area of ​​the oil disposed in the portion overlapping the central portion of the surface sheet is higher than the weight per unit area of ​​the oil disposed in the portion overlapping the side portion.

[0018] Preferably,

[0019] The oil is an amphiphilic substance.

[0020] Preferably,

[0021] A core-packing sheet is provided at a position closer to the skin than the absorbent core.

[0022] No adhesive is provided between the skin side of the absorbent core and the non-skin side of the core sheet.

[0023] Preferably,

[0024] A core-packing sheet is provided at a position closer to the non-skin side than the absorbent core.

[0025] No adhesive is provided between the non-skin side of the absorbent core and the skin side of the core sheet.

[0026] Preferably,

[0027] The non-skin-facing side of the absorbent article has a post-treatment tongue or post-treatment strip.

[0028] When viewed along the thickness direction, the oil does not overlap with the post-treatment tongue or post-treatment strip.

[0029] Preferably,

[0030] The absorbent article has a non-skin side sheet at the position closest to the non-skin side.

[0031] An adhesive portion is provided on the non-skin side of the non-skin side sheet.

[0032] The absorbent article has an overlapping area where the portion containing the oil overlaps with the adhesive portion when viewed along the thickness direction, and a non-overlapping area where the portion not containing the oil overlaps with the adhesive portion when viewed along the thickness direction.

[0033] 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.

[0034] Preferably,

[0035] The absorbent core has a core-encapsulated sheet on the skin side of the absorbent core.

[0036] The average fiber length of the fibers in the core sheet is greater than or equal to the average fiber length of the pulverized fibers in the absorbent core.

[0037] Preferably,

[0038] In both the length and width directions, the weight per unit area of ​​the oil located at the central portion is higher than that of the oil located at one side portion.

[0039] Preferably,

[0040] The oil is not provided at the outer end of the side portion.

[0041] Preferably,

[0042] This absorbent material has a surface sheet that can come into contact with the wearer's skin.

[0043] The oil is also provided on the surface sheet.

[0044] The length of the surface sheet in the width direction is longer than the length of the absorbent core in the width direction.

[0045] The absorbent core has a core oiling area where the oil is present and a core oiling area where the oil is not present.

[0046] The surface sheet has a surface area where the oil is present and a surface area where the oil is not present.

[0047] This absorbent article has:

[0048] The first region in which the core oiling agent exists overlaps with the surface oiling agent in the thickness direction;

[0049] The second region where the core oiling agent is absent overlaps with the surface oiling agent region in the thickness direction; and

[0050] The area where the surface oil is absent is the third region, which does not overlap with the absorbent core in the thickness direction.

[0051] The first region, the second region, and the third region are arranged from the inside to the outside in the width direction in the following order: the first region, the second region, and the third region.

[0052] Preferably,

[0053] The core oiling agent is present in a region within the first region where the weight per unit area of ​​the oiling agent is higher than that of the surrounding area, indicating a higher concentration of the core oiling agent.

[0054] The surface oiling region in the first region has a thinner surface oiling region where the weight per unit area of ​​the oiling agent is lower than that of the surrounding area.

[0055] When viewed along the thickness direction, the central portion of the first region in the width direction and the central portion in the length direction has a portion where the core oil-concentrated region overlaps with the surface oil-sparse region.

[0056] Preferably,

[0057] This absorbent material has a surface sheet that can come into contact with the wearer's skin.

[0058] The oil is also provided on the surface sheet.

[0059] The length of the surface sheet in the width direction is longer than the length of the absorbent core in the width direction.

[0060] The oil is not applied at a position on the outer side of the absorbent core in the width direction.

[0061] Preferably,

[0062] The absorbent article has a compression section formed by compressing the absorbent core in the thickness direction.

[0063] The compression section has a rearward compression section located at a position rearward of the center in the longitudinal direction of the absorbent article.

[0064] The rear end of the oil is located in a position further forward than the front end of the rear compression section.

[0065] Preferably,

[0066] The weight per unit volume of the oil disposed at a position closer to the skin than the center in the thickness direction of the absorbent core is greater than the weight per unit volume of the oil disposed at a position closer to the non-skin than the center in the thickness direction of the absorbent core.

[0067] Preferably,

[0068] The absorbent article has a fold along the width direction, and the oil is disposed across the fold in the length direction.

[0069] Other features of this utility model become clear from the description in this specification and the accompanying drawings.

[0070] Effects of the utility model

[0071] According to this invention, the diffusion of excrement on one side of an absorbent article in the length or width direction can be suppressed, reducing the possibility of excrement leaking outward from one end of the absorbent article in the length or width direction. Attached Figure Description

[0072] Figure 1 This is a top view of the sanitary napkin 1 taken from the skin side.

[0073] Figure 2 This is a top view of the sanitary napkin 1 taken from the non-skin side.

[0074] Figure 3 yes Figure 1 A schematic sectional view along line A-A.

[0075] Figure 4A This is a top view of the absorbent core 11. Figure 4B yes Figure 4A A schematic cross-sectional view along the J-J direction.

[0076] Figure 5 yes Figure 4A An enlarged schematic diagram of the K-K direction view section.

[0077] Figure 6 yes Figure 3 Enlarged view of absorber 10 in the image.

[0078] Figure 7 This is a top view of the absorbent 10 as observed from the skin side.

[0079] Figure 8 This is a top view diagram illustrating the area where oil agent Y is located.

[0080] Figure 9 This is a cross-sectional schematic diagram illustrating the region containing oil agent Y.

[0081] Figure 10 This is a top view of the sanitary napkin 100 taken from the non-skin side.

[0082] Explanation of reference numerals in the attached figures

[0083] 1. Sanitary napkin (absorbent); 1W, Wings; 10. Absorbent core; 11. Absorbent core; 11d, Middle and upper section; 12. Core sheet; 12a, Skin side (core sheet); 12b, Non-skin side (core sheet); 14. Central compression section; 15. Absorbent core compression section; 21. Top sheet (surface sheet); 22. Second sheet; 23. Side sheet; 24. Reinforcing sheet; 31. Bottom sheet (non-skin side sheet); 32. Main body adhesive section (adhesive section); 33. Wing adhesive section; CA, Crotch area; ee, Circular compression section; EL, Linear compression section; Ta, front side (one side); Tb, central side; Tc, rear side (the other side); Wa, left side (one side); Wb, central side; Wc, right side (the other side); Y, oil; Y11, region (region where core oil is present); Y11k, region with concentrated core oil; N11, region where core oil is absent; Y21, region (region where surface oil is present); Y21u, region with thin surface oil; N21, region where surface oil is absent; R1, region 1; R2, region 2; R3, region 3. Detailed Implementation

[0084] Based on the description in this specification and the accompanying drawings, at least the following matters become clear.

[0085] (Method 1)

[0086] An absorbent article having mutually orthogonal length, width, and thickness directions, and comprising an absorbent core with pulverized fibers, characterized in that the pulverized fibers include broadleaf tree fibers formed from broadleaf trees, the absorbent core is provided with an oil that promotes the diffusion of excrement, and in either the length or 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 sequence from one side, wherein the weight per unit area of ​​the oil provided in the central portion is higher than the weight per unit area of ​​the oil provided in the side portion.

[0087] According to Method 1, by making the unit area weight of the oil in the central portion higher than that in the side portion in either the length or width direction, it is easier to utilize the oil to promote diffusion in the central portion of the absorbent core. On the other hand, in the side portion of the absorbent core, the absorbent core comprises broadleaf fibers, and the unit area weight of the oil in the side portion is lower than that in the central portion, thereby suppressing the diffusion of excrement in the absorbent core and the side portion of the absorbent article in the length or width direction, reducing the possibility of excrement leaking outward from the side end of the absorbent article in the length or width direction. Furthermore, when worn, the wearer can visually perceive that excrement diffuses easily in the central portion of the absorbent core but not easily in the side portion in the length or width direction, thereby easily alleviating the wearer's concern that excrement may leak from the absorbent article.

[0088] (Method 2)

[0089] The absorbent article according to method 1 is characterized in that the pulverized fibers also contain coniferous fibers formed from coniferous trees, the total weight of which is greater than the total weight of which is coniferous fibers.

[0090] According to Method 2, by including more broad-leaved tree fibers with shorter average fiber length in the absorbent core, it is easy to promote absorption in the central part of the absorbent core with oil while easily suppressing the diffusion of excrement on one side of the absorbent core in the length or width direction.

[0091] (Method 3)

[0092] An absorbent article according to method 1 or 2 is characterized in that it has a surface sheet capable of contacting the wearer's skin, and the surface sheet is also provided with the oil, wherein, when viewed along the thickness direction, the weight per unit area of ​​the oil provided in the portion overlapping the central portion of the surface sheet is higher than the weight per unit area of ​​the oil provided in the portion overlapping the side portion.

[0093] According to method 3, while it is easy to use oil to promote absorption in the central part of the absorbent core, it is also easy to suppress the diffusion of excrement on one side of the absorbent core in the length or width direction.

[0094] (Method 4)

[0095] An absorbent article according to any one of methods 1 to 3, characterized in that the oil is an amphiphilic substance.

[0096] According to method 4, it is easy to change the surface tension of excrement, which facilitates the diffusion of excrement in the absorbent core.

[0097] (Method 5)

[0098] An absorbent article according to any one of methods 1 to 4 is characterized in that it has a core sheet at a position closer to the skin than the absorbent core, and no adhesive is provided between the skin side of the absorbent core and the non-skin side of the core sheet.

[0099] According to method 5, it is possible to reduce the possibility that the oil and adhesive mix on the skin side of the absorbent core and diffuse in the skin side of the core pack, and that the excrement is absorbed from the core pack into the absorbent core and diffuses excessively in the absorbent core, thereby reducing the possibility of excrement leaking to the outside of the absorbent article.

[0100] (Method 6)

[0101] An absorbent article according to any one of methods 1 to 5 is characterized in that it has a core sheet at a position closer to the non-skin side than the absorbent core, and no adhesive is provided between the non-skin side of the absorbent core and the skin side of the core sheet.

[0102] According to method 6, it is possible to reduce the possibility that the oil and adhesive mix on the non-skin side of the absorbent core and diffuse in the skin side of the core pack, and that the excrement is absorbed from the core pack into the absorbent core and diffuses excessively in the absorbent core, thereby reducing the possibility of excrement leaking to the outside of the absorbent article.

[0103] (Method 7)

[0104] An absorbent article according to any one of methods 1 to 6 is characterized in that it has a post-treatment tongue or post-treatment strip on the non-skin side of the absorbent article, wherein the oil does not overlap with the post-treatment tongue or post-treatment strip when viewed along the thickness direction.

[0105] According to method 7, the shape of the absorbent core, which is easily deformed by using an oil to spread excrement, is easily deformed. Therefore, by setting a post-treatment tongue or post-treatment strip at a position that does not overlap with the oil when viewed along the thickness direction, the position that does not overlap with the oil when viewed along the thickness direction is the part where the shape of the absorbent core is not easily deformed. Therefore, when the absorbent item is rolled up and discarded after use, it is easy to roll up the absorbent core in a state that prevents the shape of the absorbent core from being deformed.

[0106] (Method 8)

[0107] An absorbent article according to any one of methods 1 to 7 is characterized in that it has a non-skin side sheet at the position closest to the non-skin side of the absorbent article, and an adhesive portion is provided on the non-skin side of the non-skin side sheet. The absorbent article has an overlapping region where the portion provided with the oil overlaps with the adhesive portion when viewed along the thickness direction, and a non-overlapping region where the portion not provided with the oil overlaps with the adhesive portion when viewed along 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.

[0108] The adhesive portion provided on the non-skin side of the absorbent article is designed to secure it to the wearer's clothing during wear. According to method 8, the possibility of the adhesive strength of the adhesive portion becoming too strong can be reduced. For overlapping areas that contain a lot of bodily fluids after use and are prone to twisting, the absorbent article can be removed from the clothing with less force, so the shape of the absorbent core in the overlapping area is less likely to be deformed, and it can be easily discarded.

[0109] (Method 9)

[0110] An absorbent article according to any one of methods 1 to 8 is characterized in that the absorbent core has a core sheet on the skin side of the absorbent core, and the average fiber length of the fibers of the core sheet is greater than or equal to the average fiber length of the pulverized fibers of the absorbent core.

[0111] According to method 9, when worn, the absorption and diffusion of excrement in the core pack are promoted, thereby facilitating the penetration of excrement in the absorbent core located on the non-skin side.

[0112] (Method 10)

[0113] An absorbent article according to any one of methods 1 to 9 is characterized in that, in the length direction and the width direction, the weight per unit area of ​​the oil provided at the central portion is higher than the weight per unit area of ​​the oil provided at one side portion.

[0114] According to method 10, it is possible to promote the diffusion of excrement in the central part of the absorbent core in the length and width directions while reducing the possibility of excrement leakage from the outer side of one side of the absorbent article in the length and width directions.

[0115] (Method 11)

[0116] The absorbent article according to method 10 is characterized in that the oil is not provided at the outer end of the side portion.

[0117] According to method 11, diffusion at the outer end of one side of the absorbent core in both the length and width directions is easily suppressed, thereby reducing the possibility of leakage of excrement from the outer side of one side of the absorbent article in both the length and width directions.

[0118] (Method 12)

[0119] An absorbent article according to any one of methods 1 to 11, characterized in that the absorbent article has a surface sheet capable of contacting the wearer's skin, the surface sheet also having the oil, the length of the surface sheet in the width direction being longer than the length of the absorbent core in the width direction, the absorbent core having a core oil presence area having the oil and a core oil absence area not having the oil, the surface sheet having a surface oil presence area having the oil and a surface oil absence area not having the oil, the absorbent article having a first region where the core oil presence area and the surface oil presence area overlap in the thickness direction, a second region where the core oil absence area and the surface oil presence area overlap in the thickness direction, and a third region where the surface oil absence area and the absorbent core do not overlap in the thickness direction, the first region, the second region, and the third region being arranged from the inside to the outside in the width direction in the order of the first region, the second region, and the third region.

[0120] According to method 12, in the absorbent article, while promoting diffusion in the first region, it is easy to suppress diffusion in the second and third regions, thereby reducing the possibility of excrement leaking from the absorbent article to the outside.

[0121] (Method 13)

[0122] According to the absorbent article of method 12, the core oiling region has a concentrated core oiling region in the first region where the weight per unit area of ​​the oiling agent is higher than that of the surrounding area, and the surface oiling region has a sparse surface oiling region in the first region where the weight per unit area of ​​the oiling agent is lower than that of the surrounding area. When viewed along the thickness direction, the central portion in the width direction and the central portion in the length direction of the first region has a portion where the concentrated core oiling region and the sparse surface oiling region overlap.

[0123] According to method 13, while utilizing the thinner surface oil region during wear to reduce the possibility of adverse effects of the oil on the wearer's excretion opening, the presence of surface oil in the first region facilitates the penetration of excrement within the surface sheet. Furthermore, by having a core oil-concentrated region that overlaps with the thinner surface oil region when viewed along the thickness direction, the overlapping portion of the core oil-concentrated region and the thinner surface oil region facilitates the movement of excrement from the surface sheet to the absorbent core, thereby reducing the possibility of leakage due to the diffusion of excrement on the skin-side surface of the absorbent article.

[0124] (Method 14)

[0125] An absorbent article according to any one of methods 1 to 13 is characterized in that the absorbent article has a surface sheet capable of contacting the wearer's skin, the surface sheet also having the oil, the length of the surface sheet in the width direction being longer than the length of the absorbent core in the width direction, and the oil not being provided at a position on the outer side of the absorbent core in the width direction.

[0126] According to method 14, diffusion in the width direction of the absorbent core is easily suppressed, which can reduce the possibility of excrement leaking from the absorbent article to the outside.

[0127] (Method 15)

[0128] An absorbent article according to any one of embodiments 1 to 14 is characterized in that the absorbent article has a compression portion formed by compressing the absorbent core in the thickness direction, the compression portion having a rear compression portion at a position rearward of the center in the length direction of the absorbent article, and the rear end of the oil being located at a position forward of the front end of the rear compression portion.

[0129] According to method 15, since the rear compression section with higher fiber density is more likely to promote diffusion by utilizing capillary phenomenon, by placing the oil at a position further forward than the front end of the rear compression section, it is easier to suppress diffusion behind the absorbent core, thereby reducing the possibility of excrement leaking from the absorbent article to the outside.

[0130] (Method 16)

[0131] An absorbent article according to any one of methods 1 to 15 is characterized in that the weight per unit volume of the oil disposed at a position closer to the skin than the center in the thickness direction of the absorbent core is greater than the weight per unit volume of the oil disposed at a position closer to the non-skin than the center in the thickness direction of the absorbent core.

[0132] According to method 16, excretions absorbed from the skin side are easily absorbed towards the non-skin side.

[0133] (Method 17)

[0134] An absorbent article according to any one of methods 1 to 16 is characterized in that the absorbent article has a fold along the width direction, and the oil is disposed across the fold in the length direction.

[0135] According to method 17, the density of the absorbent core is easily increased in the fold, which easily promotes diffusion in the width direction, but by the oil agent crossing the fold in the length direction, it is easy to promote diffusion in the length direction, which easily reduces the possibility of excrement leaking to the outside of the absorbent article in the width direction.

[0136] ===This implementation method===

[0137] Hereinafter, as an example of an absorbent article according to this embodiment, a sanitary napkin will be used as an example for explanation. However, absorbent articles for menstruation are not limited to sanitary napkins for menstruation, and may also include panty-type sanitary napkins, underwear-type disposable diapers, belt-type disposable diapers, absorbent pads, etc.

[0138] <<<Structure of Sanitary Napkin 1 in this Embodiment>>>

[0139] Figure 1 This is a top view of the sanitary napkin 1 taken from the skin side. Figure 2 This is a top view of the sanitary napkin 1 taken from the non-skin side. Figure 3 yes Figure 1 A schematic cross-sectional view along line A-A. The sanitary napkin 1 has a length direction, a width direction, and a thickness direction. The side in the length direction that abuts against the wearer's lower abdomen is designated as the front side, and the side that abuts against the wearer's buttocks is designated as the back side. The side in the thickness direction that abuts against the wearer's skin is the skin side, and the opposite side is the non-skin side. Figure 1 The center line C-C shown 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 sectional view schematically represents sanitary napkin 1, and the dimensions may not be accurate.

[0140] The sanitary napkin 1 has an absorbent core 10, a top sheet 21, a pair of side sheets 23, and a bottom sheet 31. Alternatively, in a region closer to the skin than the absorbent core 10, a sheet-like second sheet 22 is provided at a position closer to the non-skin than the top sheet 21. The materials adjacent to each other in the thickness direction are joined using an adhesive such as hot melt adhesive.

[0141] The sanitary napkin 1 has a pair of wings 1W extending outwards in the width direction from the center of its length. The wings 1W are mainly formed by side pieces 23 and a backing piece 31. Alternatively, the structure may not necessarily have wings 1W.

[0142] The top sheet 21 is a liquid-permeable sheet located on the skin side of the absorbent 10. The top sheet 21 is a surface sheet located on the skin side of the absorbent 10 that can contact the wearer's skin. Examples of the top sheet 21 include soft sheets such as nonwoven fabrics (e.g., hot-air nonwoven fabrics, spunbond nonwoven fabrics, etc.) made of synthetic fibers such as polyethylene (PE) and polypropylene (PP), synthetic resin films with through-pores, and nonwoven sheets made of cotton. In this embodiment, the top sheet 21 is formed from a liquid-permeable sheet containing polyethylene terephthalate (PET) and polyethylene (PE), or water-retaining fibers such as cotton and rayon, such as hot-air nonwoven fabrics or spunlace nonwoven fabrics.

[0143] A pair of side sheets 23 are positioned closer to the skin than the top sheet 21 and the second sheet 22, and closer to the skin than the absorbent 10. These are sheets extending outwards from both sides in the width direction of the top sheet 21, etc. Examples of side sheets 23 include soft, liquid-permeable nonwoven fabrics and hydrophobic nonwoven fabrics, similar to the top sheet 21. Furthermore, a reinforcing sheet 24 is provided at a position further outwards in the width direction than the top sheet 21, the second sheet 22, and the absorbent 10, and between the side sheets 23 and the base sheet 31 in the thickness direction, to strengthen the side sheets 23. The reinforcing sheet 24 can be, for example, a sheet member similar to the base sheet 31, paper, SMS, or other sheet members.

[0144] The backing sheet (non-skin side sheet) 31 is a sheet material located on the non-skin side of the absorbent body 10 and situated at the non-skin side of the sanitary napkin 1. Examples of the backing sheet 31 include liquid-impermeable sheets such as polyethylene (PE) resin films. The shape of the backing sheet 31 is approximately the same as the shape of the sanitary napkin 1.

[0145] Multiple main adhesive portions (adhesive portions) 32 are provided on the non-skin side of the film 31. In this embodiment, the main adhesive portions 32 are multiple strip-shaped areas coated with hot melt adhesive along the length direction. When wearing the sanitary napkin 1, by attaching the main adhesive portions 32 to the inside of the crotch area of ​​the underwear (clothing), the sanitary napkin 1 can be prevented from shifting relative to the wearer's body.

[0146] The wing 1W has a wing adhesive portion 33 on the non-skin side of the base 31. In this embodiment, the wing adhesive portion 33 is a rectangular area coated with hot melt adhesive. When wearing the sanitary napkin 1, by folding the wing 1W back towards the non-skin side of the underwear, the wing adhesive portion 33 is adhered to the non-skin side of the crotch area of ​​the underwear, thereby securing the sanitary napkin 1 to the underwear.

[0147] At the position overlapping with the wing adhesive portion 33 in the longitudinal direction (refer to) Figure 1The lower crotch area (CA) is the area along the length of the crotch that comes into contact with the wearer's crotch when the garment is in use. It is the area that comes into contact with the opening for excretion.

[0148] The absorbent body 10 has an absorbent core 11 and a core sheet 12. The absorbent core 11 is formed by shaping absorbent fibers into a predetermined shape, and the absorbent fibers are pulverized fibers. The pulverized fibers include broadleaf tree fibers formed from broadleaf trees. In this embodiment, the absorbent core 11 includes pulverized fibers (pulp fibers), and the pulverized fibers are formed only from broadleaf tree fibers (100% broadleaf tree fibers). In addition, the absorbent core 11 is not limited to pulverized fibers formed from broadleaf tree fibers. The pulverized fibers may also include pulp fibers such as coniferous tree fibers formed from coniferous trees, in addition to broadleaf tree fibers. The absorbent core 11 may also include absorbent fibers such as cellulose-based absorbent fibers, synthetic fibers such as polyolefins, polyesters, acrylic acid, and acrylates, and superabsorbent polymers (SAP). Figure 4A This is a top view of the absorbent core 11. Figure 4B yes Figure 4A A schematic cross-sectional view along the J-J direction. Figure 5 yes Figure 4A An enlarged schematic diagram of the K-K direction view section. Figure 6 yes Figure 3 An enlarged view of absorber 10 in [the image]. Additionally, in [the image]... Figure 4A , Figure 4B and Figure 5 The uneven terrain formed by the compression section EL and other compression sections is omitted in the illustration.

[0149] The absorbent core 11 has a high portion 11d where the weight per unit area of ​​absorbent fibers is higher than the surrounding area. The high portion 11d is the portion of the absorbent core 11 that is thicker than the surrounding area (longer in the thickness direction). In this embodiment, the high portion 11d is a portion that protrudes towards the skin in the thickness direction and is a region that is approximately elliptical in plan view. By providing the high portion 11d at the center of the absorbent core 11 in the width direction and at a position that overlaps with the crotch area CA in plan view, it is easy to abut against the wearer's excretory opening when worn, making it easy for the sanitary napkin 1 to conform to the wearer's body and to quickly absorb excrement. Furthermore, by having a high portion 11d with a higher weight per unit area of ​​absorbent fibers at the position that overlaps with the crotch area CA in plan view, excrement discharged from the wearer's excretory opening is easily retained within the absorbent core 11 when worn.

[0150] The core sheet 12 is a liquid-permeable sheet component. In this embodiment, the core sheet 12 is a thin paper containing cellulose fibers. The core sheet 12 maintains the shape of the absorbent core 11 or promotes the diffusion of liquid into the absorbent core 11 by covering it.

[0151] like Figure 6 As shown, the core-covered sheet 12 has a skin-side portion 12a located closer to the skin than the absorbent core 11 and a non-skin-side portion 12b located closer to the non-skin than the absorbent core 11. In this embodiment, as... Figure 6 As shown, by folding the two ends of the core sheet 12 back towards the skin side of the absorbent core 11, the core sheet 12 covers the skin side and non-skin side of the absorbent core 11. Specifically, the absorbent core 11 is wrapped by the core sheet 12 in such a way that the top end 12ea along the length direction of the core sheet 12 is set as the outer side and the top end 12eb along the length direction of the other side is set as the inner side, thus covering the side end in the width direction of the absorbent core 11. However, the shape and form of the core sheet 12 are not limited to this. For example, the core sheet 12 may be configured as two sheet members and respectively disposed on the skin side and non-skin side of the absorbent core 11. In addition, no adhesive is provided on the inner side of the core sheet 12 in this embodiment. That is, no adhesive is used to fix the absorbent core 11 and the core sheet 12, and the absorbent core 11 maintains its shape by being wrapped by the core sheet 12.

[0152] Figure 7 This is a top view of the absorbent 10 viewed from the skin side. Figure 7 The upper part 11d of the absorbent core 11 is omitted from the illustration. (See figure) Figure 7 As shown, the absorber 10 has a central compression section 14 and a plurality of absorber compression sections 15. The central compression section 14 and the absorber compression sections 15 are respectively formed by compressing the absorbent core 11 and the core sheet 12 in the thickness direction.

[0153] The central compression section 14 and the absorbent compression section 15 are formed, for example, by compressing the absorbent 10 during the manufacturing process through the gap between a convex roller with multiple protrusions and a flat anvil roller. In this embodiment, the central compression section 14 and the absorbent compression section 15 are respectively formed by pressing the absorbent 10 from the non-skin side of the absorbent 10 toward the skin side through the gap with the convex roller abutting against the non-skin side of the absorbent 10 and the anvil roller abutting against the skin side.

[0154] The central compression section 14 is a straight compression section located in the center of the width direction along the length direction. The central compression section 14 is a portion that is recessed in the thickness direction from the front end to the rear end of the absorbent body 10, either on the skin side or the non-skin side. The central compression section 14 is a guide section that guides the absorbent body 10 to bend towards the skin side in the thickness direction, starting from the central compression section 14. Furthermore, the central compression section 14 is a portion with a higher fiber density than the uncompressed portion, and therefore also serves as a guide section that guides excrement along the length direction via capillary action.

[0155] The absorbent compression section 15 is a compression section arranged in a generally staggered pattern throughout the entire area of ​​the absorbent 10. In this embodiment, the absorbent compression section 15 has multiple elliptical-shaped compression sections. Like the central compression section 14, the absorbent compression section 15 is also a portion recessed along the thickness direction from the skin side or non-skin side. By providing the absorbent compression section 15, the shape of the absorbent 10 is easily maintained. Furthermore, the absorbent compression section 15 is a portion with a higher fiber density than the uncompressed portion, thus becoming a portion that easily absorbs excretions in the absorbent core 11 through capillary action. Due to the density difference between the absorbent compression section 15 and the uncompressed portion, the diffusion of the oil agent Y in the absorbent core 11, described later, is easily suppressed.

[0156] In addition, such as Figure 1 As shown, the sanitary napkin 1 has a linear compression section EL and a circular compression section ee.

[0157] The linear compression section EL is formed by compressing at least a portion of the top sheet 21, the second sheet 22, and the absorbent body 10 in the thickness direction. The linear compression section EL of the sanitary napkin 1 in this embodiment has a front compression section Ela located forward of the center line CL in the length direction, a rear compression section ELb located backward of the center line CL, and a central compression section ELc located between the front compression section Ela and the rear compression section ELb. By providing the linear compression section EL, the bonding of each component in the thickness direction can be strengthened, the fiber density can be increased, and the absorbency of liquid can be improved. The linear compression section EL is a linear compression section that appears as a line along the length direction when viewed from above, and a pair of sections are provided in the width direction at predetermined intervals.

[0158] Multiple circular compression sections ee are provided at the central part in the width direction and at the position overlapping the crotch region CA in the length direction. The circular compression section ee is a compression section that is circular in shape when viewed from above, and is formed by compressing at least a portion of the top sheet 21, the second sheet 22, and the absorber 10 in the thickness direction.

[0159] Since the linear compression section EL and the circular compression section ee are formed by flattening overlapping components in the thickness direction, the fiber density of each component at each compression section is higher than that of the section without compression sections. The linear compression section EL and the circular compression section ee are formed, for example, by compressing a sanitary napkin 1 during the manufacturing process through the gap between a convex roller with multiple protrusions and a flat anvil roller.

[0160] <<<Regarding the spread of excrement from sanitary napkin 1>>>

[0161] Preferably, when wearing absorbent items such as sanitary napkins, the absorbent item rapidly absorbs menstrual blood and other excretions discharged from the wearer's vaginal opening and diffuses them over a large area within the absorbent item. This prevents excretions from remaining on the skin-friendly side of the absorbent item, reducing adverse effects and discomfort on the wearer's skin. In particular, in sanitary napkins, absorbency and diffusion of excretions are sought to absorb highly viscous menstrual blood and other excretions. Therefore, methods such as incorporating substances that promote the diffusion of excretions into absorbent items are known in the past. However, when using substances that promote the diffusion of excretions, excessive promotion of the diffusion of excretions within the absorbent item may lead to leakage of excretions from the absorbent item.

[0162] The sanitary napkin 1 of this invention has an oil agent Y in its absorbent core 11 that promotes the diffusion of excrement. Furthermore, the absorbent core 11 of the sanitary napkin 1 contains pulverized fibers made from broadleaf tree fibers. Moreover, in either the length or width direction, when the absorbent core 11 is divided into three equal parts, it has a side portion, a central portion, and another side portion sequentially from one side. The weight per unit area of ​​the oil agent Y in the central portion is higher than that of the oil agent Y in the side portion.

[0163] In this embodiment, the sanitary napkin 1 extends from the skin side of the top piece 21. Figure 1 Area Y11 is coated with oil agent Y. Figure 8 This is a top view diagram illustrating the area where oil agent Y is located. Figure 9 This is a cross-sectional schematic diagram illustrating the region where oil agent Y is located. Additionally, Figure 8 and Figure 9 This is a schematic diagram; for simplicity, components have been omitted or simplified in the illustration. Figure 8 The diagram shows areas where the absorbent core 1 is provided with oil Y. Area Y11 is the area of ​​the absorbent core 11 where oil Y is provided (hereinafter, area Y11 is also referred to as "core oil presence area Y11"). Area Y21 is the area of ​​the top sheet 21 where oil Y is provided (hereinafter, area Y21 is also referred to as "surface oil presence area Y21"). Furthermore, in... Figure 9 The area containing oil agent Y is indicated by a downward-sloping line to the left, but... Figure 9 The document describes the planar configuration of the oil agent Y, which is not necessarily limited to the entire area of ​​the thickness direction of each component. For example, the oil agent Y may be provided only on the skin side of the absorbent core 11, and not on the non-skin side of the absorbent core 11.

[0164] like Figure 8As shown, in the length direction of the sanitary napkin 1, when the absorbent core 11 is divided into three equal parts, starting from the front side (one side) in the length direction, it has a front side portion (one side portion) Ta, a central portion Tb, and a rear side portion (the other side portion) Tc. Moreover, the oil-based agent Y provided in the central portion Tb has a higher unit area weight (weight of oil-based agent Y per unit area) than the oil-based agent provided in the front side portion Ta.

[0165] Alternatively, for sanitary napkins 1 with absorbent core 11 containing broadleaf tree fibers and oil agent Y, such as Figure 8 As 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 has a left side portion (one side portion) Wa, a central portion Wb, and a right side portion (the other side portion) Wc sequentially from one side. Furthermore, the oil-based agent Y located in the central portion Wb has a higher weight per unit area than the oil-based agent located in the left side portion Wa. Additionally, the left side portion Wa of the sanitary napkin 1 corresponds to the left side of the wearer during wear. Figure 8 On the left side of the middle.

[0166] In addition, Figure 8 In this case, the front side Ta in the length direction is designated as one side, and the rear side Tc as the other side, but this is not a limitation. Alternatively, the front side Ta can be designated as the other side, and the rear side Tc as one side. Similarly, the left side Wa in the width direction is designated as one side, and the right side Wc as the other side, but this is not a limitation. Alternatively, the left side Wa can be designated as the other side, and the right side Wc as one side.

[0167] In this embodiment, the absorbent core 11 of the sanitary napkin 1 has an area Y11 containing the oil agent Y located approximately in the center of the sanitary napkin 1.

[0168] Specifically, in the length direction, most of region Y11 is located in the central portion Tb, and a portion of the oil Y is located in the front portion Ta. No oil Y is located in the rear portion Tc. In the length direction, the weight per unit area of ​​the oil Y located in the central portion Tb (weight of oil Y in the central portion Tb / area of ​​the central portion Tb) is greater than the weight per unit area of ​​the oil Y located in the front portion Ta (weight of oil Y in the front portion Ta / area of ​​the front portion Ta). Furthermore, in the length direction, the weight per unit area of ​​the oil Y located in the central portion Tb (weight of oil Y in the central portion Tb / area of ​​the central portion Tb) is greater than the weight per unit area of ​​the oil Y located in the rear portion Tc (weight of oil Y in the rear portion Tc / area of ​​the rear portion Tc).

[0169] In the width direction, most of region Y11 is located in the central portion Wb, a portion of oil Y is located in the left side portion Wa, and a portion of oil Y is located in the right side portion Wc. In the width direction, the weight per unit area of ​​oil Y located in the central portion Wb (weight of oil Y in the central portion Wb / area of ​​the central portion Wb) is greater than the weight per unit area of ​​oil Y located in the left side portion Wa (weight of oil Y in the left side portion Wa / area of ​​the left side portion Wa). Furthermore, in the width direction, the weight per unit area of ​​oil Y located in the central portion Wb (weight of oil Y in the central portion Wb / area of ​​the central portion Wb) is greater than the weight per unit area of ​​oil Y located in the right side portion Wc (weight of oil Y in the right side portion Wc / area of ​​the right side portion Wc).

[0170] The sanitary napkin 1 promotes the diffusion of excrement in the central portion of the absorbent core 11 more readily than in the lateral portion by making the unit area weight of the oil agent in the central portion higher than that in the lateral portion. Furthermore, by making the unit area weight of the oil agent Y in the lateral portion lower than that in the central portion of the absorbent core 11, the diffusion of excrement in the lateral portion is more easily suppressed compared to the central portion. Additionally, generally speaking, fibers formed from broadleaf trees are shorter than those from coniferous trees. Within the absorbent core 11, the longer the fiber length, the easier it is to promote diffusion. Therefore, by including broadleaf tree fibers in the pulverized fibers of the absorbent core 11, the diffusion of excrement in the lateral portion where the unit area weight of the oil agent Y is lower is easily suppressed. Moreover, even when the absorbent core 11 contains broadleaf tree fibers as pulverized fibers, by making the unit area weight of the oil in the central part of either the length direction or the width direction higher than the unit area weight of the oil in the side part Y, it is easy to promote the diffusion of excrement in the central part of the absorbent core 11, thereby reducing the possibility that excrement will remain on the surface of the absorbent article during wear.

[0171] Therefore, by promoting the diffusion of excrement in the central part of the absorbent core 11 of the sanitary napkin 1, excrement is less likely to remain on the skin side of the absorbent core 11. This reduces the adverse effects and discomfort on the wearer's skin while decreasing the possibility of excrement leaking from one end of the sanitary napkin 1 in the length or width direction. Furthermore, when wearing the sanitary napkin, the wearer can visually recognize whether excrement diffuses easily in the central part of the absorbent core 11 or does not diffuse easily on one side in the length or width direction, thereby reducing the wearer's concern about possible leakage from the sanitary napkin 1.

[0172] Examples of pulverized 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), and other non-wood pulps; regenerated cellulose fibers such as rayon fibers; and semi-synthetic fibers such as cellulose acetate. Absorbent materials mostly use coniferous fibers (coniferous pulp) with relatively long fiber lengths.

[0173] The average fiber length of coniferous fiber (coniferous pulp) is 2.5 mm, while the average fiber length of broadleaf fiber (broadleaf pulp) is 0.79 mm. That is, the average fiber length of broadleaf fiber is shorter than that of coniferous fiber. Compared to coniferous fiber, the broadleaf fiber used as the pulverized fiber in the absorbent core 11 does not readily promote the diffusion of excrement (liquid). Therefore, by placing the oil agent Y in the central portion of the absorbent core 11 containing broadleaf fiber in the length or width direction to promote diffusion, and by suppressing the diffusion of excrement on the side in the length or width direction where the unit area weight of the oil agent Y is lower, leakage of excrement can be reduced.

[0174] In this embodiment, the pulverized fibers of the absorbent core 11 are composed solely of broadleaf tree fibers (broadleaf tree pulp). That is, all the pulverized fibers in the absorbent core 11 are broadleaf tree fibers (100% broadleaf tree fibers). Therefore, the oil agent Y promotes the diffusion of excrement at the central portion in the length or width direction of the absorbent core 11, and the side portion in the length or width direction is an area with a lower unit area weight of the oil agent Y. Furthermore, by utilizing broadleaf tree fibers with shorter average fiber lengths, the diffusion of excrement at the side portion in the length or width direction is easily suppressed.

[0175] Alternatively, the pulverized fibers of the absorbent core 11 may include coniferous fibers (coniferous pulp) formed from coniferous trees in addition to broadleaf pulp. When the absorbent core 11 contains coniferous fibers, it is preferable that the total weight of the broadleaf fibers is greater than the total weight of the coniferous fibers. By including more broadleaf fibers with a shorter average fiber length in the absorbent core 11, it is easier to promote the absorption of excrement in the central portion of the absorbent core 11 in the length or width direction using the oil agent Y, while simultaneously suppressing the diffusion of excrement on one side of the absorbent core 11 in the length or width direction.

[0176] The presence of broadleaf tree fibers in the pulverized fibers of the absorbent core 11 can be confirmed by well-known methods.

[0177] For example, it can be done through the following methods.

[0178] First, a predetermined weight (0.04g) of the pulverized fibers from the absorbent core 11 of the sanitary napkin 1 is taken as a sample, and the pulverized fibers are hydrolyzed with water (distilled water).

[0179] Next, the sample was transferred to a beaker, and images were taken and fiber lengths measured using a fiber length distribution measuring device ("Valmet FS5", manufactured by Valmet Corporation). Additionally, the sample concentration was automatically adjusted to 15 mmol / L to 23 mmol / L using this device. The presence of broadleaf fibers in the sample was confirmed by comparing the obtained fiber lengths with the average fiber length of broadleaf tree fibers.

[0180] The preferred configuration is that the length-weighted average of the pulverized fibers in the absorbent core 11 is 50% or more, and the fiber length is 1 mm or less. By including a large number of short fibers in the absorbent core 11, it is less likely that excrement will diffuse along the plane of the fibers within the absorbent core 11. As a result, it is easier to promote the vertical transfer of excrement from the skin side of the absorbent core 11 to the non-skin side, thus reducing the possibility of excrement leaking to the outside of the sanitary napkin 1.

[0181] Oil Y is a substance that promotes the diffusion of excrement (liquid), and oil Y is preferably an amphiphilic substance. Because oil Y is an amphiphilic substance, possessing both hydrophilic and hydrophobic groups, when oil Y comes into contact with excrement during wear, the surface tension of the excrement changes, making it easier to promote the diffusion of excrement (liquid) in the area coated with oil Y.

[0182] As oil agent Y, for example, the following materials can be used.

[0183] [Esters of chain-linked alkyltetraols and at least one fatty acid]

[0184] ·UNISTAR H-408BRS, manufactured by NOF Co., Ltd.

[0185] Pentaerythritol tetra(2-ethylhexanoate), weight average molecular weight: approximately 640

[0186] ·UNISTAR H-2408BRS-22, manufactured by NOF Co., Ltd.

[0187] A mixture of pentaerythritol tetra(2-ethylhexanoate) and neopentyl glycol di(2-ethylhexanoate) (58:42, weight ratio), weight average molecular weight: approximately 520.

[0188] [Esters of chain triols and at least one fatty acid]

[0189] ·Tri-C2L oil fatty acid glyceride, manufactured by NOF Co., Ltd.

[0190] It generally contains C8 fatty acids, C10 fatty acids, and C12 fatty acids in a weight ratio of 37:7:56, along with glycerol and triglycerides of fatty acids, with a weight average molecular weight of approximately 570.

[0191] ·TriCL oil fatty acid glyceride, manufactured by NOF Co., Ltd.

[0192] It generally contains C8 fatty acids, C12 fatty acids, glycerol, and fatty acid triesters in a weight ratio of approximately 44:56, with a weight average molecular weight of approximately 570.

[0193] ·PANACET 810s, manufactured by NOF Co., Ltd.

[0194] It generally contains C8 fatty acids, C10 fatty acids, glycerol, and triglycerides of fatty acids in a weight ratio of approximately 85:15, with a weight average molecular weight of approximately 480.

[0195] ·PANACET 800, manufactured by NOF Co., Ltd.

[0196] The fatty acids are all caprylic acid (C8), glycerol, and fatty acid triesters, with a weight-average molecular weight of approximately 470.

[0197] ·PANACET 800B, manufactured by NOF Co., Ltd.

[0198] The fatty acids are all 2-ethylhexanoic acid (C8), glycerol, and fatty acid triesters, with a weight-average molecular weight of approximately 470.

[0199] ·NA36, manufactured by NOF Co., Ltd.

[0200] It generally contains C16 fatty acids : C18 fatty acids : C20 fatty acids (including both saturated and unsaturated fatty acids) in a weight ratio of 5:92:3, along with glycerol and fatty acid triesters, with a weight average molecular weight of approximately 880.

[0201] ·Three coconut oil fatty acid glycerides, manufactured by NOF Co., Ltd.

[0202] The composition is roughly in the weight ratio of 4:8:60:25:3, containing C8 fatty acids: C10 fatty acids: C12 fatty acids: C14 fatty acids: C16 fatty acids (including both saturated and unsaturated fatty acids), glycerol, and triesters of fatty acids, with a weight average molecular weight of 670.

[0203] ·Caprylic acid diglyceride, manufactured by NOF Co., Ltd.

[0204] The fatty acids are caprylic acid, glycerol, and fatty acid diesters, with a weight-average molecular weight of 340.

[0205] [An ester of a chain-like hydrocarbon diol and at least one fatty acid]

[0206] ·UNISTAR H-208BRS, manufactured by NOF Co., Ltd.

[0207] Di(2-ethylhexanoic acid) neopentyl glycol ester, weight average molecular weight: approximately 360

[0208] ·COMPOL BL, manufactured by NOF Co., Ltd.

[0209] Butanediol dodecanoic acid (C12) monoester, weight average molecular weight: approximately 270

[0210] ·COMPOL BS, manufactured by NOF Corporation

[0211] Butanediol octadecanoic acid (C18) monoester, weight average molecular weight: approximately 350

[0212] [Compounds having a chain hydrocarbon moiety and two to four hydroxyl groups that substitute for hydrogen atoms in the chain hydrocarbon moiety]

[0213] [Ethers of compounds having a chain hydrocarbon moiety and a hydroxyl group that substitutes for a hydrogen atom in the chain hydrocarbon moiety]

[0214] [Carboxylic acids, hydroxy acids, alkoxy acids, or oxo acids containing 2 to 4 carboxyl groups of hydrogen atoms in the chain hydrocarbon moiety and the substituted chain hydrocarbon moiety]

[0215] [An ester of a chain hydrocarbon tricarboxylic acid, hydroxy acid, alkoxy acid, or oxoacid with at least one aliphatic monohydric alcohol having three carboxyl groups]

[0216] O-acetyl tributyl citrate, manufactured by Tokyo Chemical Industry Co., Ltd.

[0217] Weight average molecular weight: approximately 400

[0218] Tributyl citrate, manufactured by Tokyo Chemical Industry Co., Ltd.

[0219] Weight-average molecular weight: approximately 360

[0220] [An ester of a chain hydrocarbon dicarboxylic acid, hydroxy acid, alkoxy acid, or oxoacid with two carboxyl groups and at least one aliphatic monohydric alcohol]

[0221] Dioctyl adipic acid, manufactured by Wako Pure Chemical Industries.

[0222] Weight-average molecular weight: approximately 380

[0223] [A compound having a chain hydrocarbon moiety and a single C-C bond inserted into the chain hydrocarbon moiety, selected from the group consisting of ether bond (-O-), carbonyl bond (-CO-), ester bond (-COO-), and carbonate bond (-OCOO-).]

[0224] [Esters of fatty acids and aliphatic monohydric alcohols]

[0225] ·ELECTOL WE20, manufactured by NOF Co., Ltd.

[0226] Ester of dodecanoic acid (C12) and dodecanool (C12), weight average molecular weight: approximately 360

[0227] ·ELECTOL WE40, manufactured by NOF Co., Ltd.

[0228] Ester of tetradecanoic acid (C14) and dodecanoic acid (C12), weight average molecular weight: approximately 390

[0229] [Polyoxylated C3-C6 alkylene glycols, or their alkyl esters or alkyl ethers]

[0230] [Polyoxyl C3-C6 alkylene glycols]

[0231] ·UNIOL PB500, manufactured by NOF Co., Ltd.

[0232] Polybutanediol, weight average molecular weight: approximately 500

[0233] ·UNIOL PB700, manufactured by NOF Co., Ltd.

[0234] Polyoxybutylenepolyoxypropylene glycol, weight average molecular weight: approximately 700

[0235] [Chain hydrocarbons]

[0236] ·PARLEAM 6, manufactured by NOF Co., Ltd.

[0237] Branched hydrocarbons are produced by copolymerizing liquid isoalkanes, isobutylene, and n-butene, followed by hydrogenation. Degree of polymerization: approximately 5 to approximately 10; Weight average molecular weight: approximately 330.

[0238] [other]

[0239] ·NA50, manufactured by NOF Co., Ltd.

[0240] The triglyceride of glycerol and fatty acids, obtained by hydrogenation of NA36, which reduces the ratio of double bonds derived from the unsaturated fatty acids used as raw materials, has a weight-average molecular weight of approximately 880.

[0241] ·(Caprylic acid / capric acid) monoglyceride, manufactured by NOF Co., Ltd.

[0242] It is a monoester of glycerol and fatty acids, generally containing caprylic acid (C8) and capric acid (C10) in a weight ratio of approximately 85:15, with a weight-average molecular weight of approximately 220.

[0243] Monomuls 90-L2 glyceryl monolaurate, manufactured by Cognis Japan.

[0244] Isopropyl citrate, manufactured by Tokyo Chemical Industry Co., Ltd.

[0245] Weight-average molecular weight: approximately 230

[0246] Diisostearic acid malate

[0247] Weight-average molecular weight: approximately 640

[0248] ·UNIOL PB1000R, manufactured by NOF Co., Ltd.

[0249] Polybutanediol, weight average molecular weight: approximately 1000

[0250] ·UNIOL D-250, manufactured by NOF Co., Ltd.

[0251] Polypropylene glycol, weight average molecular weight: approximately 250

[0252] ·UNIOL D-400, manufactured by NOF Co., Ltd.

[0253] Polypropylene glycol, weight average molecular weight: approximately 400

[0254] ·UNIOL D-700, manufactured by NOF Co., Ltd.

[0255] Polypropylene glycol, weight average molecular weight: approximately 700

[0256] ·UNIOL D-1000, manufactured by NOF Co., Ltd.

[0257] Polypropylene glycol, weight average molecular weight: approximately 1000

[0258] ·UNIOL D-1200, manufactured by NOF Co., Ltd.

[0259] Polypropylene glycol, weight average molecular weight: approximately 1160

[0260] ·UNIOL D-2000, manufactured by NOF Co., Ltd.

[0261] Polypropylene glycol, weight average molecular weight: approximately 2030

[0262] ·UNIOL D-3000, manufactured by NOF Co., Ltd.

[0263] Polypropylene glycol, weight average molecular weight: approximately 3000

[0264] ·UNIOL D-4000, manufactured by NOF Co., Ltd.

[0265] Polypropylene glycol, weight average molecular weight: approximately 4000

[0266] ·PEG1500, manufactured by NOF Co., Ltd.

[0267] Polyethylene glycol, weight average molecular weight: approximately 1500 to approximately 1600

[0268] ·WILBRITE cp9, manufactured by NOF Co., Ltd.

[0269] A compound formed by esterification of polybutanediol with its terminal OH groups by hexadecanoic acid (C16), with a weight-average molecular weight of approximately 1150.

[0270] ·UNILUBE MS-70K, manufactured by NOF Co., Ltd.

[0271] Stearyl ether of polypropylene glycol, approximately 15 repeating units, weight average molecular weight: approximately 1140

[0272] ·NONION S-6, manufactured by NOF Co., Ltd.

[0273] Polyoxyethylene monostearate, approximately 7 repeating units, weight-average molecular weight: approximately 880

[0274] UNILUBE 5TP - 300KB

[0275] Polyoxyethylene polyoxypropylene pentaerythritol ether, produced by adding 1 mol of pentaerythritol to 5 mol of ethylene oxide and 65 mol of propylene oxide, has a weight-average molecular weight of 4130.

[0276] ·WILBRITE s753, manufactured by NOF Co., Ltd.

[0277] Polyoxyethylene polyoxypropylene polyoxybutylene glycerol, weight average molecular weight: approximately 960

[0278] ·UNIOL TG-330, manufactured by NOF Co., Ltd.

[0279] Glyceryl ether of polypropylene glycol, approximately 6 repeating units, weight average molecular weight: approximately 330

[0280] ·UNIOL TG-1000, manufactured by NOF Co., Ltd.

[0281] Glyceryl ether of polypropylene glycol, approximately 16 repeating units, weight average molecular weight: approximately 1000

[0282] ·UNIOL TG-3000, manufactured by NOF Co., Ltd.

[0283] Glyceryl ether of polypropylene glycol, approximately 16 repeating units, weight average molecular weight: approximately 3000

[0284] ·UNIOL TG-4000, manufactured by NOF Co., Ltd.

[0285] Glyceryl ether of polypropylene glycol, approximately 16 repeating units, weight average molecular weight: approximately 4000

[0286] ·UNILUBE DGP-700, manufactured by NOF Co., Ltd.

[0287] Polypropylene glycol diglyceride, approximately 9 repeating units, weight average molecular weight: approximately 700

[0288] ·UNIOX HC60, manufactured by NOF Co., Ltd.

[0289] Polyoxyethylene hydrogenated castor oil, weight average molecular weight: approximately 3570

[0290] Vaseline, manufactured by Cognis Japan

[0291] Hydrocarbons derived from petroleum, semi-solid

[0292] The comparison of the unit area weight of oil Y can be performed using well-known methods. For example, a reagent corresponding to the oil Y can be applied, and the changes in color and concentration can be compared.

[0293] The sanitary napkin 1 of this embodiment uses PANACET 810S (triglycerides, manufactured by Nichiyu Co., Ltd.) as oil agent Y. This oil agent Y is an oil agent containing unsaturated fatty acids, which can promote excretion, or impart unsaturated fatty acids to the wearer's skin to improve skin feel, or protect the wearer's skin.

[0294] For this oil agent Y, the presence and weight per unit area of ​​oil agent Y can be compared using the oil leakage colorimetric test reagent "Moraymille OiL (manufactured by Taseto Co., Ltd.)".

[0295] Specifically, the absorbent core 11 is removed from the sanitary napkin 1, and the aforementioned oil leakage color-developing test agent is sprayed onto the entire area of ​​the absorbent core 11. If the oil leakage color-developing test agent is applied, the portion containing oil (oil agent Y) will appear red. Areas that do not appear red are not coated with oil agent Y, and the unit area weight of oil agent Y is 0 (zero). On the other hand, in the areas that appear red, by comparing the intensity of the red color, the unit area weight of oil agent Y in each area can be compared.

[0296] In this embodiment, the sanitary napkin 1 has a higher unit area weight of the oil-based agent Y located in the central portion than that located in one side portion in both the length and width directions. Specifically, the unit area weight of the oil-based agent Y located in the central portion Tb is higher than that located in the front side portion Ta, and the unit area weight of the oil-based agent Y located in the central portion Wb is higher than that located in the left side portion Wa. Therefore, the central portion (the portion of central portion Tb and central portion Wb) of the absorbent core 11 in both the length and width directions is the portion that easily comes into contact with the wearer's vaginal opening or other excretory opening during wear. Thus, the higher unit area weight of the oil-based agent Y in the central portion of the absorbent core 11 in both the length and width directions facilitates rapid absorption of excrement excreted during wear and promotes the diffusion of excrement. On the other hand, since it is easy to suppress the diffusion at one side Ta and Wa in the length direction and width direction of the absorbent core 11, the possibility of excrement leaking from the outside of the front side (one side) in the length direction and the outside of the left side (one side) in the width direction of the sanitary napkin 1 can be reduced.

[0297] Preferably, the oil agent Y is not provided at the outer end of the front (one side) portion Ta in the length direction and the outer end of the left (one side) portion Wa in the width direction of the absorbent core 11. This facilitates the suppression of the diffusion of excrement at the outer end of the front (one side) portion Ta in the length direction and the outer end of the left (one side) portion Wa in the width direction of the absorbent core 11, reducing the possibility of leakage of excrement from the outer side of the front (one side) in the length direction and from the outer side of the left (one side) in the width direction of the sanitary napkin 1. Furthermore, the outer end of the front (one side) portion Ta in the length direction of the absorbent core 11 is a portion 10 mm long from the front end of the absorbent core 11 in the length direction, more preferably a portion 5 mm long from the front end. The outer end of the left (one side) portion Wa in the width direction of the absorbent core 11 is a portion 10 mm long from the left end in the width direction of the absorbent core 11, more preferably a portion 5 mm long from the left end.

[0298] Preferably, 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 located behind the center line CL in the length direction. Figure 1In this case, it is preferable that the rear end of the region where the oil agent Y is provided (region Y11) is located forward of the front end of the rear compression section ELb. The linear compression section EL and the rear compression section ELb are parts with a higher fiber density than the surrounding area, and are parts where the diffusion of excrement is easily promoted by capillary action. Therefore, by providing the oil agent Y at a position forward of the front end of the rear compression section ELb, the diffusion at the rear of the absorbent core 11 is easily suppressed, and the possibility of excrement leaking to the rear outer side of the sanitary napkin 1 can be reduced.

[0299] As described above, a core sheet 12 covers the absorbent core 11. The average fiber length of the fibers in the skin-side portion 12a (core sheet) of the core sheet 12, located closer to the skin than the absorbent core 11, is preferably greater than or equal to the average fiber length of the pulverized fibers of the absorbent core 11. Therefore, compared to 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 pulverized fibers of the absorbent core 11, absorption and diffusion of excrement from the skin-side portion 12a are more easily promoted during wear. Thus, by vertically transferring the excrement to the absorbent core 11, located further away from the skin side than the skin side 12a, while the excrement is diffused planarly at the skin-side portion 12a, penetration of excrement within the absorbent core 11 is more easily promoted. Furthermore, the average fiber length of the pulverized fibers of the absorbent core 11 and the average fiber length of the fibers on the skin side 12a can be measured by well-known methods, such as by taking images and measuring the fiber length using the aforementioned fiber length distribution measuring device ("Valmet FS5", manufactured by Valmet Co., Ltd.).

[0300] The fibers of the skin side 12a (core sheet) can be removed, for example, by the method described below.

[0301] First, use toluene to break down sanitary napkin 1 and remove the core pack 12.

[0302] Dry the removed core package.

[0303] Next, place 15g of core sheet and approximately 1.5L of water (adjusted to a concentration of 1% relative to the weight of the core sheet) into a plastic container (inner diameter: 120mm, height: 220mm), and stir at room temperature for approximately 24 hours using a mixer (manufactured by EYELA MAZELAZ Tokyo Rikka Equipment Co., Ltd.). During this time, stir slowly to prevent the fibers from breaking.

[0304] Then, use a straw (aperture: 2mm~3mm) to suck up the fibers dispersed in the water along with the water.

[0305] The extracted fibers are collected through suction filtration and then dried.

[0306] The length of the extracted fibers was measured using an electron microscope, and the average fiber length was calculated based on the measured fiber length.

[0307] The skin-side portion (core piece) 12a of the core piece 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 12a. That is, it is preferable that the skin-side of the absorbent core 11 and the skin-side 12a are not bonded together using an adhesive. The oily agent Y, which promotes excretion, is highly likely to mix not only with the excrement but also 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 12a, then before wearing the sanitary napkin 1 (before absorbing excrement), the oily agent Y mixes with the adhesive at the skin-side 12a, causing the oily agent Y to spread to an unexpected area of ​​the skin-side 12a. In this case, when wearing the sanitary napkin 1, if excrement is absorbed, the excrement that has spread planarly at the skin-side 12a moves towards the non-skin-side towards the absorbent core 11, excessively spreading over a large area within the absorbent core 11, potentially causing leakage of excrement 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 12a, it is possible to prevent the spread of oil Y caused by the mixing of oil Y and adhesive at the skin side 12a, thereby reducing the possibility of excessive spread of excrement at the absorbent core 11 during wear and reducing the possibility of excrement leaking to the outside of the sanitary napkin 1.

[0308] Preferably, no adhesive is provided between the non-skin side of the absorbent core 11 and the non-skin side (core sheet) 12b located closer to the non-skin side of the absorbent core 11. That is, it is preferable that the non-skin side of the absorbent core 11 and the non-skin side 12b are not bonded together with adhesive. Similar to the skin side (skin side 12a), the possibility of excessive diffusion of the oil Y in the non-skin side 12b due to mixing of the oil and adhesive is prevented. This reduces the possibility of excrement that spreads planarly in the non-skin side 12b moving to the absorbent core 11 and excessively spreading over a larger area within the absorbent core 11. Therefore, the possibility of excrement leaking to the outside of the sanitary napkin 1 is reduced.

[0309] like Figure 2As shown, the sanitary napkin 1 has a main adhesive portion 32 on the non-skin side of the backing sheet 31 located at the position closest to the skin. The main adhesive portion 32 is provided to secure the sanitary napkin 1 to the wearer's clothing during wear. When the sanitary napkin 1 is viewed along the thickness direction, there is an overlapping area y32 where the portion of the absorbent core 11 where the oil Y is provided overlaps with the main adhesive portion 32, and a non-overlapping area n32 where the portion of the absorbent core 11 where the oil Y is not provided overlaps with the main adhesive portion 32. The sanitary napkin 1 of this embodiment is as follows Figure 2 As shown, the rectangular region Y11 is the area where the absorbent core 11 is provided with the oil Y, and the main adhesive portion 32 located inside region Y11 is the overlapping region y32. Furthermore, the main adhesive portion 32 located outside region Y11 is the non-overlapping region n32. In this case, it is preferable that the adhesive strength of the main adhesive portion 32 at the overlapping region y32 is lower than the adhesive strength of the main adhesive portion 32 at the non-overlapping region n32. Additionally, adhesive strength is the strength of the force used to fix the sanitary napkin 1 to clothing, and also the strength of the force used to peel the sanitary napkin 1 from the sanitary napkin 1. Furthermore, the main adhesive portion 32 of the sanitary napkin 1 has five linear adhesive application areas discontinuously arranged in the width direction on both sides in the left-right direction. Figure 2 The right-sloping downward section (in the text) actually functions as an adhesive part due to the penetration of adhesive between the adhesive application areas. Therefore, the main adhesive part 32 of the sanitary napkin 1 is a rectangular area located on both sides in the left-right direction, each surrounded by the outer end of the adhesive application area.

[0310] The overlapping area y32 of the sanitary napkin 1 is where the adhesive of the main adhesive portion 32 easily mixes with the oil agent Y. Because the adhesive mixes with the oil agent Y, the adhesive strength easily decreases. In particular, when using a breathable membrane 31 that allows gas to pass through but not liquid, the oil agent Y in the absorbent core 11 easily mixes with the main adhesive portion 32 through the backing sheet 31. Therefore, the main adhesive portion 32 of the sanitary napkin 1 includes portions with locally higher adhesive strength and portions with locally lower adhesive strength, thereby ensuring the fixation strength to clothing while reducing the possibility of excessively strong adhesive strength. After use, the absorbent core 11 of the sanitary napkin 1, especially the portion containing the oil agent Y, contains more bodily fluid and is prone to twisting and deformation. When removing the sanitary napkin 1 with this absorbent core 11 from clothing, because of the overlapping area y32 with lower adhesive strength, the sanitary napkin 1 can be removed from clothing with less force, thus preventing deformation of the absorbent core 11 at the overlapping area y32, facilitating the rolling up of the removed sanitary napkin 1, and making it easy to discard.

[0311] The adhesive strength of the main adhesive portion 32 at each region (overlapping region y32, non-overlapping region n32) can be measured by well-known methods.

[0312] For example, the force required to peel off the adhesive portion 32 of the main body can be measured by a peel test (JIS Z0237), thereby enabling a comparison of adhesive strength. Specifically, firstly, the overlapping area y32 and the non-overlapping area n32 of the sanitary napkin 1 are cut into predetermined sizes (10mm × 10mm) to serve as sample pieces.

[0313] Then, each sample piece is attached to the test plate, and the ends of the sample pieces are grasped and peeled off. The peeling load is measured using a load sensor. This measurement is performed multiple times for each sample.

[0314] The adhesive strength of the main adhesive portion 32 [N / 10mm] can be calculated by dividing the average value of the obtained peel load [N] by the width of the sample piece (10mm) and multiplying by 10.

[0315] Adhesive strength [N / 10mm] = (Load [N] × 10) / (Width of sample)

[0316] The adhesive strength can be compared based on the calculated adhesive strength [N / 10mm] of each sample piece.

[0317] Alternatively, the test board can be a SUS304 steel plate as specified in JIS Z0237, or other boards made by fixing 100% cotton sheet components or 100% polyester sheet components to a horizontal board for use.

[0318] Sanitary napkin 1 is distributed, sold, and stored in a folded state with one or more folds F. The folds F are fold lines along the width direction. In sanitary napkin 1, a front fold F1 is provided in the length direction, located forward of the center line CL, and a rear fold F2 is provided in the length direction, located backward of the center line CL. The sanitary napkin 1 is folded with the skin side as the inside in both folds F1 and F2. Figure 1 The sanitary napkin 1 shown is in its unfolded state with all folds F extended. In this unfolded state, it is preferable that the oil Y is disposed across the folds 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 fold F1. That is, when viewed from above, the front fold F1 is provided at a position overlapping with the region Y11. In the front fold F1 (fold F), the density of the fibers of the absorbent core 11 is easily increased. Since the front fold F1 is along the width direction, excrement reaching the front fold F1 during wear is easily diffused outward along the width direction of the front fold F1. Therefore, by providing the region Y11 where the oil agent Y is provided in the absorbent core 11 is provided across the front fold F1, even when excrement reaches the front fold F1 during wear, the oil agent Y in the region Y11 can easily promote the diffusion of excrement in the length direction. As a result, the possibility of excrement leaking outward in the width direction of the sanitary napkin 1 can be reduced.

[0319] Preferably, the weight per unit volume of the oil Y disposed in the portion tu closer to the skin than the center 11c in the thickness direction of the absorbent core 11 is greater than the weight per unit volume of the oil Y disposed in the portion tb closer to the non-skin than the center 11c in the thickness direction of the absorbent core 11. In other words, more oil Y is disposed on the skin side than on the non-skin side in the thickness direction of the absorbent core 11. Therefore, when worn, excrement absorbed from the skin side of the sanitary napkin 1 is easily moved from the skin side of the absorbent core 11 towards the non-skin side.

[0320] As described above, the top sheet 21 of the sanitary napkin 1 is a sheet material that can come into contact with the wearer's skin. Preferably, the top sheet 21 is also provided with an oil agent Y, having a region Y21 in which the oil agent Y is provided. Moreover, it is preferable that, when viewed along the thickness direction, the weight per unit area of ​​the oil agent Y provided in the portion overlapping the central portions Tb and Wb in the length or width direction of the top sheet 21 is higher than the weight per unit area of ​​the portion overlapping the side portions Ta and Wa in the length or width direction. In the manufacturing process of the sanitary napkin 1 of this embodiment, the oil agent Y is applied from the skin side of the top sheet 21 in a state where the top sheet 21 and the absorbent core 10 are overlapped. Thus, the oil agent Y that has permeated from the top sheet 21 remains in the absorbent core 11 and is retained there. In addition to the absorbent core 11, an oil agent Y is also provided in the top sheet 21. The weight per unit area of ​​the oil agent Y provided in the portion of the top sheet 21 overlapping with the central portions Tb and Wb in the length or width direction is higher than the weight per unit area of ​​the oil agent Y provided in the portion overlapping with the side portions Ta and Wa in the length or width direction. This facilitates the diffusion of excrement in the portion of the top sheet 21 overlapping with the central portions Tb and Wb in the length or width direction. Therefore, when viewed along the thickness direction, after the excrement has diffused to a certain extent in the portion of the top sheet 21 overlapping with the central portions Tb and Wb in the length or width direction, the excrement moves towards the non-skin side, making it easier to absorb excrement over a larger area of ​​the central portions Tb and Wb in the length or width direction of the absorbent core 11. This accelerates the absorption of excrement by the sanitary napkin 1. Therefore, while it is easy to use oil agent Y to promote the absorption of excrement in the central part Tb and Wb of the absorbent core 11, it is easy to suppress the diffusion of excrement in the side part Ta and Wa in the length or width direction of the absorbent core 11.

[0321] Furthermore, if the top sheet 21 of the sanitary napkin 1 is provided with an oil agent Y, it is preferable that, as Figure 9 As shown, the length W21 of the top sheet 21 in the width direction is longer than the length W11 of the absorbent core 11 in the width direction (W21 > W11), and no oil agent Y is provided at a position on the outer side of the absorbent core 11 in the width direction. Therefore, it is easy to suppress the diffusion of excrement at the end of the absorbent core 11 in the width direction, and the possibility of excrement leaking from the outer side of the sanitary napkin 1 in the width direction can be reduced.

[0322] When the top sheet 21 of the sanitary napkin 1 is provided with an oil agent Y, it is preferable that, as Figure 9As shown, the length W21 of the top sheet 21 in the width direction is longer than the length W11 of the absorbent core 11 in the width direction (W21 > W11). Furthermore, the absorbent core 11 has a core oil-containing region Y11 with oil Y and a core oil-free region N11 without oil Y. The surface sheet 21 has a surface oil-containing region Y21 with oil Y and a surface oil-free region N21 without oil Y. Preferably, it has a first region R1 where the core oil-containing region Y11 and the surface oil-containing region Y21 overlap in the thickness direction of the sanitary napkin 1, a second region R2 where the core oil-free region N11 and the surface oil-containing region Y21 overlap in the thickness direction of the sanitary napkin 1, and a third region R3 where the surface oil-free region and the absorbent core do not overlap in the thickness direction of the sanitary napkin 1. Moreover, it is preferable that, as... Figure 9 As shown, regions R1, R2, and R3 are arranged in the order of R1, R2, and R3 from the inside to the outside in the width direction. Therefore, when worn, the diffusion of excrement is first promoted in region R1 of the sanitary napkin 1, while the diffusion of excrement is easily suppressed in regions R2 and R3. Thus, the possibility of excrement leaking outwards in the width direction of the sanitary napkin 1 can be reduced.

[0323] Preferably, the core oil-containing region Y11 has a concentrated core oil region Y11k in the first region R1 where the weight per unit area of ​​oil Y is higher than the surrounding area, and the surface oil-containing region Y21 has a thinner surface oil region Y21u in the first region R1 where the weight per unit area of ​​oil Y is lower than the surrounding area. In this case, more preferably, when the sanitary napkin 1 is viewed along the thickness direction, the central portion in the width direction and the central portion in the length direction of the first region R1 has a portion where the concentrated core oil region Y11k and the thinner surface oil region Y21u overlap.

[0324] The first region R1 of the top sheet 21, which can come into contact with the wearer's skin, is the part that easily comes into contact with the vaginal opening or other excretory openings when worn. The vaginal opening or other excretory openings are particularly sensitive areas and may be irritated or adversely affected when in direct contact with the oil Y. In particular, the absorbent core 11 of this embodiment has a raised portion 11d protruding towards the skin in the center of both the length and width directions, thus making it even easier to come into contact with the wearer's vaginal opening or other excretory openings.

[0325] On the other hand, the top sheet 21 preferably contains an oil agent Y, and particularly preferably, it promotes the penetration and diffusion of excrement within the top sheet 21 in a first region R1 that overlaps with the core oil agent region Y11 when viewed along the thickness direction, preventing excrement from flowing on the surface (skin side) of the top sheet 21 and leaking from the sanitary napkin 1. Therefore, by having a surface oil-sparse region Y21u in the first region R1 of the top sheet 21, the amount of oil agent Y provided in the part that may come into direct contact with the wearer's excretory opening is reduced, thereby promoting the penetration and diffusion of excrement within the top sheet 21 and reducing the possibility of the oil agent Y causing irritation or adverse effects on the wearer's excretory opening.

[0326] Furthermore, by having a concentrated core oil region Y11k and a thin surface oil region Y21u in the first region R1 when viewed along the thickness direction, and by having an overlap between the concentrated core oil region Y11k and the thin surface oil region Y21u when viewed along the thickness direction, it is easier to transfer from the top sheet 21 to the non-skin side compared to diffusion within the top sheet 21. This facilitates the absorption and diffusion of excrement in the absorbent core 11, which has a higher unit area weight of oil Y in the concentrated core oil region Y11k than the surrounding area. Therefore, it is easier to absorb excrement into the absorbent core 11, reducing the possibility of leakage due to the diffusion of excrement on the surface of the sanitary napkin 1.

[0327] Absorbent products such as sanitary napkins can also have a structure with a post-treatment tongue or post-treatment strip. For example, they can also be like... Figure 10 As shown, sanitary napkin 100 is a nighttime menstrual pad, and sanitary napkin 100 has a post-treatment tongue 50. Figure 10 This is a top view of the sanitary napkin 100 taken from the non-skin side. Components of the sanitary napkin 100 that have the same structure as the sanitary napkin 1 described above are labeled with the same reference numerals and their descriptions are omitted.

[0328] The sanitary napkin 100 has a post-treatment tongue 50 on its non-skin side, that is, on the non-skin side of the backing sheet 31. The post-treatment tongue 50 is a component used after using the sanitary napkin 100. The post-treatment tongue 50 is a strip-shaped film component comprising a fixed part fixed to the backing sheet 31 by an adhesive or the like and a free part not fixed to the backing sheet 31. After using the sanitary napkin 100, the post-treatment tongue 50, which is in a rolled-up state in the length direction, wraps around the sanitary napkin 100 and attaches it to the main adhesive part 32 of the sanitary napkin 100, thereby easily maintaining the rolled-up state of the sanitary napkin 100.

[0329] Preferably, the post-treatment tongue 50 does not overlap with the oil agent Y (region Y11) when the sanitary napkin 100 is viewed along its thickness direction. After use, the absorbent core 11 of the sanitary napkin 100 uses the oil agent Y to diffuse excrement, making it easy for the shape of the absorbent core 11 to become deformed. On the other hand, the portion of the absorbent core 11 that does not overlap with the oil agent Y (region Y11) when viewed along its thickness direction diffuses less excrement using the oil agent Y compared to the portion that overlaps with the oil agent Y (region Y11), thus the shape of the absorbent core 11 is less likely to become deformed. Therefore, by providing the post-treatment tongue 50 in the portion that does not overlap with the oil agent Y (region Y11) when viewed along its thickness direction, it is easier to roll up the absorbent core 11 in a state that prevents it from becoming deformed when the sanitary napkin 100 is rolled up for disposal after use.

[0330] Additionally, the sanitary napkin 100 includes a post-treatment tongue 50, but is not limited to it. For example, when the absorbent is a disposable diaper or a panty-type sanitary napkin, a post-treatment strip for maintaining the rolled-up state of the used absorbent may also be included. The post-treatment strip is a membrane member with one end fixed to the absorbent in the longitudinal direction and an adhesive portion at the other end in the longitudinal direction. By wrapping the rolled-up absorbent with the post-use strip and securing it with the adhesive portion at the other end of the post-treatment strip, it is easy to maintain the rolled-up state of the absorbent. Like the post-treatment tongue 50, it is preferable that the post-treatment strip is positioned so that it does not overlap with the oil Y provided on the absorbent core 11 when viewed along the thickness direction.

[0331] ===Other Implementation Methods===

[0332] The embodiments of this utility model have been described above, but these embodiments are intended to facilitate understanding of this utility model and are not intended to limit its interpretation. Furthermore, it is self-evident that this utility model can be modified and improved without departing from its spirit, and that its equivalents are included.

Claims

1. An absorbent article having mutually orthogonal length, width, and thickness directions. The absorbent article is characterized by having an absorbent core containing pulverized fibers. The pulverized fibers contain broadleaf tree fibers formed from broadleaf trees. The absorbent core is provided with an oil that promotes the diffusion of excrement. In either the length direction or the width direction, when the absorbent core is divided into three equal parts, it sequentially has a side portion, a central portion, and a other side portion starting from one side. The weight per unit area of ​​the oil located in the central part is higher than that of the oil located on one side.

2. The absorbent article according to claim 1, characterized in that, The pulverized fibers also include coniferous fibers formed from coniferous trees. The total weight of the broadleaf tree fibers is greater than the total weight of the coniferous tree fibers.

3. The absorbent article according to claim 1 or 2, characterized in that, This absorbent material has a surface sheet that can come into contact with the wearer's skin. The oil is also provided on the surface sheet. When viewed along the thickness direction, the weight per unit area of ​​the oil disposed in the portion overlapping the central portion of the surface sheet is higher than the weight per unit area of ​​the oil disposed in the portion overlapping the side portion.

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

5. The absorbent article according to claim 1 or 2, characterized in that, A core-packing 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 sheet.

6. The absorbent article according to claim 1 or 2, characterized in that, A core-packing 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 sheet.

7. The absorbent article according to claim 1 or 2, characterized in that, The non-skin-facing side of the absorbent article has a post-treatment tongue or post-treatment strip. When viewed along the thickness direction, the oil does not overlap with the post-treatment tongue or post-treatment strip.

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

10. The absorbent article according to claim 1 or 2, characterized in that, In both the length and width directions, the weight per unit area of ​​the oil located at the central portion is higher than that of the oil located at one side portion.

11. The absorbent article according to claim 10, characterized in that, The oil is not provided at the outer end of the side portion.

12. The absorbent article according to claim 1 or 2, characterized in that, This absorbent material has a surface sheet that can come into contact with the wearer's skin. The oil 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. The absorbent core has a core oiling area where the oil is present and a core oiling area where the oil is not present. The surface sheet has a surface area where the oil is present and a surface area where the oil is not present. This absorbent article has: The first region in which the core oiling agent exists overlaps with the surface oiling agent in the thickness direction; The second region where the core oiling agent is absent overlaps with the surface oiling agent region in the thickness direction; as well as The area where the surface oil is absent is the third region, which does not overlap with the absorbent core in the thickness direction. The first region, the second region, and the third region are arranged from the inside to the outside in the width direction in the following order: the first region, the second region, and the third region.

13. The absorbent article according to claim 12, characterized in that, The core oiling agent is present in a region within the first region where the weight per unit area of ​​the oiling agent is higher than that of the surrounding area, indicating a higher concentration of the core oiling agent. The surface oiling region in the first region has a thinner surface oiling region where the weight per unit area of ​​the oiling agent is lower than that of the surrounding area. When viewed along the thickness direction, the central portion of the first region in the width direction and the central portion in the length direction has a portion where the core oil-concentrated region overlaps with the surface oil-sparse region.

14. The absorbent article according to claim 1 or 2, characterized in that, This absorbent material has a surface sheet that can come into contact with the wearer's skin. The oil 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. The oil is not applied at a position on the outer side of 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 compression section formed by compressing the absorbent core in the thickness direction. The compression section has a rearward compression section located at a position rearward of the center in the longitudinal direction of the absorbent article. The rear end of the oil is located in a position further forward than the front end of the rear compression section.

16. The absorbent article according to claim 1 or 2, characterized in that, The weight per unit volume of the oil disposed at a position closer to the skin than the center in the thickness direction of the absorbent core is greater than the weight per unit volume of the oil disposed at a position closer to the non-skin than 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 fold along the width direction. In the length direction, the oil is disposed across the fold.

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