JP7562627B2 - Sanitary absorbent articles - Google Patents

Description

The present invention relates to a sanitary absorbent article.

Sanitary napkins and the like are known as absorbent articles that absorb excrement such as menstrual blood. For example, Patent Document 1 discloses that in order to provide an absorbent article that has appropriate flexibility and fit while absorbing excrement, high and low basis weight sections are provided in the absorbent body, and grooves are provided that straddle the high and low basis weight sections. The absorbent article in Patent Document 1 has low basis weight sections that are linearly arranged in the longitudinal and width directions, and the low basis weight sections are provided across the entire area of the absorbent body.

JP 2012-245130 A

However, the absorbent article described in Patent Document 1 has a low basis weight region that is provided over the entire absorbent body, which makes the absorbent body too easily deformed, and there is a risk that the absorbent article may become twisted or excreted liquid may leak out from the outside of the absorbent article in the width direction when worn.

The present invention was made in consideration of the above-mentioned problems of the conventional art, and its purpose is to provide a sanitary absorbent article that is easy to promote the diffusion of excrement in the longitudinal direction while reducing twisting of the sanitary absorbent article.

The main invention for achieving the above object is a sanitary absorbent article having a longitudinal direction, a width direction and a thickness direction, the sanitary absorbent article comprising an absorbent core having liquid absorbent fibers, a skin-side sheet portion located on the skin side of the absorbent core, a non-skin-side sheet portion located on the non-skin side of the absorbent core, and a pair of wing portions extending outward on both sides in the width direction, and a wing adhesive portion having an adhesive applied thereto is provided on each of the non-skin sides in the thickness direction of the pair of wing portions, the absorbent core having a pair of openings penetrating the thickness direction and along the longitudinal direction, and at least one of the openings being arranged to be in contact with the skin. a sanitary absorbent article in which a portion of the high basis weight portion is provided at a position overlapping with the wing adhesive portion in the longitudinal direction, has an adjacent portion adjacent to the outline of the opening from the outside, has a high basis weight portion adjacent to the adjacent portion from the outside and having a higher basis weight of the liquid absorbent fiber than the adjacent portion, and has a joint portion where the skin side sheet portion and the non-skin side sheet portion are joined at a position overlapping with the opening when viewed in the thickness direction, and the density of the liquid absorbent fiber throughout the high basis weight portion in the absorbent core is higher than the density of the liquid absorbent fiber in the adjacent portion.
Other features of the present invention will become apparent from the following detailed description of the present invention and the accompanying drawings.

The present invention makes it easier to promote the diffusion of excrement in the longitudinal direction while also reducing twisting of the sanitary absorbent article.

FIG. 2 is a plan view of the napkin 1 seen from the skin side. FIG. 2 is a plan view of the napkin 1 as seen from the non-skin side. 2 is a schematic cross-sectional view taken along the line A-A in FIG. 1 . Fig. 4A is a plan view of the absorbent core 11. Fig. 4B is a schematic cross-sectional view taken along the line J-J in Fig. 4A. 4B is a schematic cross-sectional view taken along the line K-K in FIG. 4A. FIG. 4 is an enlarged view of the absorbent body 10 in FIG. 3. FIG. 2 is a diagram illustrating the diffusion of excrement in the napkin 1. FIG. 4B is an enlarged view of a portion X in FIG. 4A. 11A to 11C are diagrams illustrating modified examples of the absorbent core 11.

At least the following matters will become apparent from the description of this specification and the accompanying drawings.
Aspect 1 is a sanitary absorbent article having a longitudinal direction, a width direction, and a thickness direction, and comprising an absorbent core having liquid-absorbent fibers, a skin-side sheet portion located on the skin side of the absorbent core, a non-skin-side sheet portion located on the non-skin side of the absorbent core, and a pair of wing portions extending outward on both sides in the width direction, and a wing adhesive portion applied with an adhesive is provided on each of the non-skin sides in the thickness direction of the pair of wing portions, wherein the absorbent core has a pair of openings that penetrate the absorbent core in the thickness direction and extend along the longitudinal direction, at least a portion of the openings is provided at a position overlapping with the wing adhesive portions in the longitudinal direction, the absorbent core has an adjacent portion adjacent to the outline of the openings from the outside, and a high basis weight portion adjacent to the adjacent portion from the outside and having a higher basis weight of the liquid absorbent fibers than the adjacent portion, and a joint where the skin-side sheet portion and the non-skin-side sheet portion are joined at a position overlapping with the opening when viewed in the thickness direction.

According to aspect 1, by having an adjacent portion between the opening and the high basis weight portion, in which the basis weight of the liquid absorbent fiber is lower than that of the high basis weight portion, it becomes easier to promote the diffusion of excrement in the longitudinal direction along the shape of the opening, while the joint portion provided at the opening makes it easier to integrally deform the skin side sheet portion, non-skin side sheet portion, and absorbent body, which makes it easier to reduce twisting of the sanitary absorbent article.

Aspect 2 is a sanitary absorbent article according to aspect 1, in which the density of the liquid absorbent fibers in the high basis weight portion of the absorbent core is higher than the density of the liquid absorbent fibers in the adjacent portion.

According to aspect 2, the excrement absorbed by the absorbent core is more likely to diffuse in the adjacent areas than in the opening due to capillary action, and is more likely to diffuse in the high basis weight areas than in the adjacent areas. This makes it easier to promote diffusion of excrement along the opening shaped along the longitudinal direction, thereby reducing the risk of excrement leaking out from the outside in the width direction of the sanitary absorbent article.

Aspect 3 is a sanitary absorbent article according to Aspect 1 or 2, which has a back sheet located on the non-skin side of the non-skin side sheet portion, a main adhesive portion coated with adhesive is provided on the non-skin side of the back sheet, and the openings each have a portion that overlaps with the main adhesive portion when viewed in the thickness direction.

According to aspect 3, when the sanitary absorbent article is put on or worn, it becomes easier to fix the sanitary absorbent article to clothing while maintaining the shape of the opening, which reduces the risk of the opening shape being crushed in the width direction, and it becomes easier to promote the diffusion of excrement in the longitudinal direction while also reducing wrinkling of the sanitary absorbent article.

Aspect 4 is a sanitary absorbent article according to any one of aspects 1 to 3, in which the pair of openings are spaced apart in the width direction.

According to aspect 4, it becomes easier to reduce the spread of waste in the width direction.

Aspect 5 is a sanitary absorbent article according to any one of aspects 1 to 4, in which the adjacent portion has a protrusion that protrudes toward the adjacent opening.

According to aspect 5, it becomes easier to encourage the excrement absorbed by the sanitary absorbent article to diffuse along the adjacent parts before diffusing at the opening, so that it is possible to reduce the risk of excrement leaking laterally outside the sanitary absorbent article while reducing diffusion toward the opening.

Aspect 6 is a sanitary absorbent article according to aspect 5, in which the basis weight of the liquid absorbent fibers at the tip side of the convex portion in the width direction is lower than the basis weight of the liquid absorbent fibers at the base side of the convex portion in the width direction.

According to aspect 6, the capillary phenomenon can easily promote the diffusion of excrement at the base side of the protrusion, reducing diffusion toward the opening and reducing the risk of excrement leaking laterally outward from the sanitary absorbent article.

Aspect 7 is a sanitary absorbent article according to any one of aspects 1 to 6, in which the center of the joint in the thickness direction is located on the non-skin side of the center of the sanitary absorbent article in the thickness direction.

According to aspect 7, the waste material absorbed by the sanitary absorbent article is more easily dispersed in the non-skin side in the thickness direction than when the joint is provided closer to the skin than the center in the thickness direction of the sanitary absorbent article, thereby reducing the risk of the absorbed waste material continuing to come into contact with the wearer's skin and reducing discomfort.

Aspect 8 is a sanitary absorbent article according to any one of aspects 1 to 7, which has a back sheet located on the non-skin side of the non-skin side sheet portion, a main body adhesive portion coated with adhesive is provided on the non-skin side of the back sheet, and the joint portion and the back sheet are spaced apart in the thickness direction.

According to aspect 8, the sanitary absorbent article is fixed to clothing by the main adhesive portion provided on the back sheet, while the provision of a joint portion spaced from the back sheet makes it easier to move the absorbent core in response to the wearer's body shape and movement, improving the fit when worn. In addition, the application of both the force transmitted from the clothing and the force due to the wearer's body shape and movement to the joint portion and opening can be reduced, making it easier to maintain the open shape of the opening.

Aspect 9 is a sanitary absorbent article according to any one of aspects 1 to 8, in which the amount of the liquid absorbent fibers in the adjacent portion located closer to the skin than the center in the thickness direction of the absorbent core is greater than the amount of the liquid absorbent fibers in the adjacent portion located closer to the skin than the center in the thickness direction of the absorbent core.

According to aspect 9, excrement absorbed from the skin side of the absorbent core is more likely to diffuse in the adjacent portion adjacent to the opening than when the amount of liquid absorbent fibers in the adjacent portion located closer to the skin than the center in the thickness direction of the absorbent core is reduced, making it easier to diffuse along the contour of the opening, reducing diffusion to the inside of the opening and promoting longitudinal diffusion of excrement.

Aspect 10 is a sanitary absorbent article according to any one of aspects 1 to 8, in which the amount of the liquid absorbent fibers in the adjacent portion located on the non-skin side of the center in the thickness direction of the absorbent core is greater than the amount of the liquid absorbent fibers in the adjacent portion located on the skin side of the center in the thickness direction of the absorbent core.

According to aspect 10, the amount of liquid absorbent fibers in the adjacent portion located away from the skin side of the center in the thickness direction of the absorbent core is less than the amount of liquid absorbent fibers in the adjacent portion located closer to the skin side of the center in the thickness direction of the absorbent core, making it easier for the absorbent core to disperse excrement absorbed in the worn state at a position away from the wearer's skin, thereby reducing the risk of excrement once absorbed coming into contact with the wearer's skin again.

Aspect 11 is a sanitary absorbent article according to any one of aspects 1 to 10, which has a top sheet located closer to the skin than the skin-side sheet portion, and at least includes a compressed portion in which the top sheet, the skin-side sheet portion, and the non-skin-side sheet portion are compressed in the thickness direction, and the compressed portion is aligned in the longitudinal direction and has a portion where the opening and the compressed portion overlap when viewed in the thickness direction.

According to aspect 11, the compression portion provided at a position overlapping the opening in the thickness direction reduces the risk of the sanitary absorbent article becoming excessively hard, promotes the diffusion of excrement in the longitudinal direction, and makes it easier to make the joint at the opening stronger.

Aspect 12 is a sanitary absorbent article according to aspect 11, in which the opening located on one side in the width direction has an outwardly curved opening that curves outward in the width direction, and the compressed portion has an outwardly curved compressed portion that curves outward in the width direction at a position that overlaps with the wing adhesive portion in the longitudinal direction.

According to aspect 12, by forming the compressed portion to conform to the shape of the opening at the position where it overlaps with the wing adhesive portion in the longitudinal direction, it becomes easier to strengthen the bonding of the bonding portion at the opening over a wider area while reducing the risk of the sanitary absorbent article becoming excessively hard.

Aspect 13 is a sanitary absorbent article according to any one of aspects 1 to 12, in which the opening comprises a first opening and a second opening spaced apart in the longitudinal direction.

According to aspect 13, it is possible to reduce the risk that the entire opening will be crushed in the width direction due to an external force when the garment is being worn.

Aspect 14 is a sanitary absorbent article according to any one of aspects 1 to 13, which has a front opening in front of the opening and a rear opening behind the opening, and the front opening, the opening, and the rear opening are spaced apart from each other.

According to aspect 14, longitudinal diffusion is promoted in front of and behind the openings of the sanitary absorbent article, and the openings are spaced apart from one another, reducing the risk of all openings being crushed by external forces when the article is worn.

Aspect 15 is a sanitary absorbent article according to aspect 14, which has a top sheet located closer to the skin than the skin-side sheet portion, and at least includes a compressed portion in which the top sheet, the skin-side sheet portion, and the non-skin-side sheet portion are compressed in the thickness direction, the compressed portion is aligned in the longitudinal direction, and when viewed in the thickness direction, the compressed portion has portions that overlap the opening, the front opening, and the rear opening, respectively.

According to aspect 15, the risk of the sanitary absorbent article becoming excessively hard is reduced, while facilitating the diffusion of excrement in the longitudinal direction and making it easier to strengthen the bonding of the joints at each opening.

====Present Embodiment====
Hereinafter, a sanitary napkin will be described as an example of the sanitary absorbent article according to the present embodiment. However, the sanitary absorbent article is not limited to a sanitary napkin, and may be a shorts-type napkin or the like.

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

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

The napkin 1 has a pair of wing portions 1W extending outward in the width direction from the center in the longitudinal direction. The wing portions 1W are mainly formed by the side sheets 23 and the back sheet 31.

The top sheet 21 is a liquid-permeable sheet located closer to the skin than the absorbent body 10. The top sheet 21 is a surface sheet located closer to the skin than the skin-side sheet portion 12a (core wrap sheet 12) described below. Examples of the top sheet 21 include flexible sheets such as nonwoven fabrics (e.g., air-through nonwoven fabrics and spunbond nonwoven fabrics) made of synthetic fibers such as polyethylene (PE) and polypropylene (PP), synthetic resin films with through holes, and nonwoven fabric sheets made of cotton. The top sheet 21 of this embodiment is formed of a liquid-permeable sheet of polyethylene terephthalate (PET) and polyethylene (PE), or air-through nonwoven fabrics or spunlace nonwoven fabrics containing water-retentive fibers such as cotton and rayon.

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

The back sheet 31 is a sheet located on the non-skin side of the absorbent body 10. An example of the back sheet 31 is a liquid-impermeable sheet such as a polyethylene (PE) resin film. The shape of the back sheet 31 is almost the same as the outer shape of the napkin 1.

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

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

The position where it overlaps with the wing adhesive portion 33 in the longitudinal direction (see FIG. 1) is the crotch area CA. The crotch area CA is the area that contacts the wearer's crotch in the longitudinal direction when worn, and is the area that contacts the blood drainage port through which the wearer's waste is discharged.

The absorbent body 10 has an absorbent core 11 and a core wrap sheet 12. Examples of the absorbent core 11 include liquid-absorbent fibers such as pulp fibers, cellulosic absorbent fibers, and synthetic fibers made of polyolefin, polyester, acrylic, acrylate, etc., molded into a predetermined shape to which a superabsorbent polymer (SAP) is added. Fig. 4A is a plan view of the absorbent core 11. Fig. 4B is a schematic cross-sectional view taken along the arrows J-J in Fig. 4A. Fig. 5 is a schematic cross-sectional view taken along the arrows K-K in Fig. 4A. Note that in Figs. 4A, 4B, and 5, the unevenness caused by compressed parts such as compressed part EL is omitted.

The absorbent core 11 has regions with different basis weights of the liquid absorbent fibers. The absorbent core 11 has a pair of openings 11h. The openings 11h are portions where the absorbent core 11 penetrates in the thickness direction, and where the basis weight of the liquid absorbent fibers is zero (0). The absorbent core 11 has an adjacent portion 11n adjacent to the contour of the opening 11h from the outside. Also, the absorbent core 11 has a high basis weight portion 11f adjacent to the adjacent portion 11n from the outside, in which the basis weight of the liquid absorbent fibers is higher than that of the adjacent portion 11n. In other words, the adjacent portion 11n has a lower basis weight of the liquid absorbent fibers than the high basis weight portion 11f. The high basis weight portion 11f has a middle height portion 11d that is thicker (longer in the thickness direction) than the surrounding area at a position where it overlaps with the wing adhesive portion 33 in the longitudinal direction and between the pair of openings 11h in the width direction. In the high basis weight portion 11f, the middle height portion 11d is a portion where the basis weight of the liquid absorbent fibers is even higher than that of the surrounding area. The middle height portion 11d of this embodiment is a portion that protrudes away from the skin in the thickness direction, and is a region that is approximately elliptical in plan view. By providing the middle height portion 11d at the center in the width direction of the absorbent core 11 and at a position that overlaps with the crotch area CA in plan view, it becomes easier to hold the excrement discharged from the wearer's excretory opening within the absorbent core 11 when worn. The middle height portion 11d of the absorbent core 11 may also protrude toward the skin in the thickness direction. By having the middle height portion 11d protrude toward the skin, it becomes easier to abut against the wearer's excretory opening when worn, making it easier to fit the napkin 1 to the wearer's body and facilitating quick absorption of excrement.

The pair of openings 11h are spaced apart in the width direction and are shaped along the longitudinal direction. In this embodiment, the pair of openings 11h are provided in multiple locations in the longitudinal direction, and are provided on both outer sides of the absorbent core 11 divided into three equal parts in the width direction. Note that the liquid-absorbent fibers and superabsorbent polymers (SAP) that make up the absorbent core 11 are soft materials and fluid, so the openings 11h are not only parts that completely penetrate the absorbent core 11 and have no liquid-absorbent fibers at all, but also may contain some liquid-absorbent fibers and superabsorbent polymers (SAP), etc.

As a pair of openings 11h in this embodiment, a first opening 11ha, a second opening 11hb, and a third opening 11hc are provided in order from the front side in the longitudinal direction. Specifically, a pair of first openings 11ha are provided in front of the wing adhesive portion 33 in the longitudinal direction, a pair of second openings 11hb are provided at a position where at least a portion of the openings overlaps with the wing adhesive portion 33 in the longitudinal direction, and a pair of third openings 11hc are provided behind the wing adhesive portion 33 in the longitudinal direction. The first opening 11ha, the second opening 11hb, and the third opening 11hc are each openings whose longitudinal length is longer than their width length along the longitudinal direction.

Adjacent portions 11n are provided on the outside of each opening 11h. Specifically, the first opening 11ha, the second opening 11hb, and the third opening 11hc are provided with first adjacent portions 11na, second adjacent portions 11nb, and third adjacent portions 11nc that are adjacent to the contours of the openings 11ha, 11hb, and 11hc from the outside. The first adjacent portions 11na, second adjacent portions 11nb, and third adjacent portions 11nc are provided so as to surround the entire contours of the first opening 11ha, second opening 11hb, and third opening 11hc, respectively. Since the first opening 11ha, the second opening 11hb, and the third opening 11hc are each shaped along the longitudinal direction, the first adjacent portion 11na, the second adjacent portion 11nb, and the third adjacent portion 11nc, which are adjacent to the first opening 11ha, the second opening 11hb, and the third opening 11hc from the outside, are also each shaped along the longitudinal direction.

The core wrap sheet 12 is a liquid-permeable sheet member, such as tissue. In this embodiment, both side ends of the core wrap sheet 12 are folded back to the non-skin side of the absorbent core 11, thereby covering the skin side and non-skin side of the absorbent core 11 with the core wrap sheet 12, but this is not limited to this. For example, the core wrap sheet 12 may be configured as two sheet members, arranged on the skin side and non-skin side of the absorbent core 11, respectively.

As shown in FIG. 6, the core wrap sheet 12 has a skin-side sheet portion 12a located closer to the skin than the absorbent core 11, and a non-skin-side sheet portion 12b located closer to the skin than the absorbent core 11. FIG. 6 is an enlarged view of the absorbent body 10 in FIG. 3.

The core wrap sheet 12 is fixed to the absorbent core 11 by applying an adhesive such as a hot melt adhesive to the non-skin side of the skin side sheet portion 12a in a predetermined application pattern, and applying an adhesive to the skin side of the non-skin side sheet portion 12b in a predetermined application pattern. Region S in FIG. 7 is a region where adhesive is applied to the non-skin side of the skin side sheet portion 12a and the skin side of the non-skin side sheet portion 12b. The adhesive applied to region S bonds the skin side sheet portion 12a and the non-skin side sheet portion 12b at positions that overlap with each opening 11h in the thickness direction, forming bonded portions 12s. The adhesive application pattern in region S can be a spiral pattern, an omega (Ω) pattern, a wavy pattern, a linear (striped) pattern, etc.

As shown in FIG. 1 etc., the napkin 1 has linear compression portions EL. The linear compression portions EL are portions in which at least a portion of the top sheet 21, the second sheet 22, and the absorbent body 10 are compressed in the thickness direction. By providing the linear compression portions EL, the bonding of each component in the thickness direction can be strengthened, the fiber density can be increased, and the liquid absorption can be improved. The linear compression portions EL are linear compression portions that run along the longitudinal direction in a plan view, and a pair are provided with a predetermined gap in the width direction.

The absorbent body 10 also has multiple circular compressed portions ee at the center in the width direction and at a position overlapping with the crotch area CA in the longitudinal direction. The circular compressed portions ee are compressed portions that are circular in plan view, and are portions where at least a portion of the top sheet 21, the second sheet 22, and the absorbent body 10 are compressed in the thickness direction.

The linear compression section EL and the circular compression section ee are formed by squeezing members stacked in the thickness direction, so the fiber density of each member in each compression section is higher than the fiber density of the portion where no compression section is provided. The linear compression section EL and the circular compression section ee are formed, for example, by passing the napkin 1 in the manufacturing process through the roll gap between a convex roller having multiple convex sections and an anvil roller with a flat surface, and squeezing it.

<<<Regarding the opening 11h and the adjacent portion 11n>>>
Conventionally, it is desirable to improve comfort during wearing of sanitary absorbent articles such as sanitary napkins by promoting longitudinal diffusion rather than lateral diffusion to reduce leakage of excrement while making the sanitary absorbent article flexible. However, if compressed parts are provided along the longitudinal direction of an absorbent core molded from liquid absorbent fibers in a substantially rectangular shape to promote longitudinal diffusion, the rigidity of the absorbent core increases, which may cause discomfort to the wearer. On the other hand, the more flexibility the sanitary absorbent article has in order to improve comfort to the wearer, the more likely it is that the sanitary absorbent article will twist, and the deformation of the sanitary absorbent article may cause discomfort to the wearer.

In response to this, the napkin 1 has a pair of openings 11h (second openings hb), which reduces the rigidity of the absorbent core 11 and improves the flexibility of the napkin 1. At least a portion of the second opening 11hb is provided at a position (crotch area CA) that overlaps with the wing adhesive portion 33 in the longitudinal direction, and the napkin 1 has a second adjacent portion 11nb that is adjacent to the contour of the second opening 11hb from the outside, and a high basis weight portion 11f that is adjacent to the second adjacent portion 11nb from the outside and has a basis weight of liquid absorbent fibers higher than that of the second adjacent portion 11nb.

7 is a diagram for explaining the diffusion of excrement in the napkin 1. In FIG. 7, for convenience, the circular compression portion ee and the middle height portion 11d are omitted. As shown in FIG. 7, in the worn state, excrement such as menstrual blood is first absorbed in the crotch area CA, which is a position overlapping with the wing adhesive portion 33 in the longitudinal direction, and in the center in the width direction. This crotch area CA and the center in the width direction are the high basis weight portion 11f of the absorbent core 11, and in the napkin 1 of this embodiment, they are also the middle height portion 11d. Then, the absorbed excrement begins to diffuse toward the outside in the longitudinal direction and the width direction, respectively. When the excrement diffused toward the outside in the width direction reaches the second adjacent portion 11nb, it is more likely to diffuse toward the front or rear in the longitudinal direction along the second adjacent portion 11nb than the second opening 11hb located on the outside in the width direction due to the difference in capillary phenomenon and hydrophilicity. The second adjacent portion 11nb has a higher density of liquid absorbent fibers and is more hydrophilic than the second opening 11hb. This makes it easier to spread the excrement in the longitudinal direction than in the width direction, reducing the risk of excrement leaking out from the outside of the napkin 1 in the width direction.

In addition, at a position overlapping with the second opening 11hb in the thickness direction, the napkin 1 has a joint 12s where the skin side sheet portion 12a and the non-skin side sheet portion 12b are joined. As described above, in the napkin 1, the skin side sheet portion 12a and the non-skin side sheet portion 12b are joined to each other by adhesive (area S in FIG. 4A) applied to the non-skin side of the skin side sheet portion 12a and the skin side of the non-skin side sheet portion 12b of the core wrap sheet 12, as shown in FIG. 6, to form the joint 12s. By providing the second opening 11hb, there is a risk that the shape of the absorbent core 11 may be distorted or the napkin 1 may become easily twisted, but by having the joint 12s, the skin side sheet portion 12a and the non-skin side sheet portion 12b can reduce the risk of the absorbent core 11 losing its shape. In addition, when the absorbent core 11 absorbs bodily waste, there is a risk that the absorbent core 11 will become separated from the skin-side sheet portion 12a and the non-skin-side sheet portion 12b and deform; however, by having the joint portion 12s, the absorbent core 11 can be easily deformed integrally with the skin-side sheet portion 12a and the non-skin-side sheet portion 12b, thereby reducing the discomfort felt by the wearer.

For the absorbent core 11, it is preferable that the density of the liquid absorbent fibers in the high basis weight portion 11f is higher than that in the second adjacent portion 11nb. As shown in FIG. 7, the excrement absorbed by the absorbent core 11 and reaching the second adjacent portion 11nb is more likely to diffuse to the second adjacent portion 11nb than to the second opening 11hb due to capillary action, and is more likely to diffuse to the high basis weight portion 11f than to the second adjacent portion 11nb. This makes it easier to diffuse the excrement along the second opening 11hb, which has a shape along the longitudinal direction, and therefore in the napkin 1, it is easier to promote diffusion toward the longitudinal outward direction than toward the width outward direction, thereby reducing the risk of excrement leaking from the widthwise outside of the napkin 1.

As described above, the napkin 1 has a back sheet 31 located on the non-skin side of the non-skin side sheet portion 12b, and the main adhesive portion 32 is provided on the non-skin side of the back sheet 31. As shown in FIG. 2, it is preferable that the second openings 11hb each have a portion overlapping with the main adhesive portion 32 when viewed in the thickness direction. In particular, it is preferable that at least a part of the outline of the second openings 11hb each has a portion overlapping with the main adhesive portion 32 when viewed in the thickness direction. This makes it easier to maintain the shape of the second openings 11hb when putting on the napkin 1 or when wearing it, so that the napkin 1 can be easily fixed to clothing such as underwear or clothes while maintaining the shape of the second openings 11hb. By maintaining the shape of the second openings 11hb while wearing it, it is easier to maintain the joint portion 12s on the inside of the second openings 11hb while promoting the diffusion of excrement in the longitudinal direction rather than the width direction of the napkin 1, and it is easier to reduce the twisting of the napkin 1.

As shown in FIG. 1 etc., it is preferable that the pair of second openings 11hb are spaced apart in the width direction. By providing the second openings 11hb spaced apart from each other in the width direction, it becomes easier to reduce the outward diffusion of excrement in the width direction than if the second openings 11hb were continuous with each other.

It is preferable that the second adjacent portion 11nb has a convex portion t that protrudes toward the adjacent second opening 11hb. FIG. 8 is an enlarged view of part X in FIG. 4A. As shown in FIG. 8, the absorbent core 11 of this embodiment has an uneven shape over the entire boundary between the second adjacent portion 11nb and the second opening 11hb, and due to this uneven shape, the second adjacent portion 11nb has a plurality of convex portions t that protrude toward the second opening 11hb. By having the convex portion t in the second adjacent portion 11nb, it becomes easier to encourage the excrement absorbed by the napkin 1 to diffuse along the second adjacent portion 11nb before diffusing into the second opening hb. In addition, since the boundary between the second adjacent portion 11nb and the second opening hb has an uneven shape, it becomes easier to slowly diffuse along the second adjacent portion 11nb. This makes it easier to reduce diffusion to the second opening hb, and reduces the risk of excrement leaking outward in the lateral direction of the napkin 1.

In this convex portion t, it is preferable that the basis weight of the liquid absorbent fiber at the tip side of the convex portion t in the width direction is lower than the basis weight of the liquid absorbent fiber at the base side of the convex portion in the width direction. The tip side of the convex portion t is the second opening 11hb side of the absorbent core 11, and the base side of the convex portion t is the opposite side to the second opening 11hb and is the high basis weight section 11f side. By making the basis weight of the liquid absorbent fiber at the tip side in the width direction of the convex portion t lower than the basis weight of the liquid absorbent fiber at the base side in the width direction, it is easier to promote the diffusion of excrement at the base side of the convex portion t by capillary action than at the tip side of the convex portion t. This reduces the diffusion to the inside of the second opening 11hb and reduces the risk of excrement leaking outward in the lateral direction of the napkin 1.

8, in the second adjacent portion 11nb provided on one side in the width direction, a convex portion t1 is provided on one side (outside in the width direction) of the center ch in the width direction of the thickness of the second opening 11hb, and a convex portion t2 is provided on the other side (inside in the width direction) of the center ch in the width direction of the thickness of the second opening 11hb. At this time, it is preferable that the width direction length dp2 from the apex of the convex portion t2 at the position of the apex p2 of the width direction of the convex portion t2 in the longitudinal direction to the high basis weight portion 11f located on the outside (one side) in the width direction of the convex portion t1 is longer than the width direction length dp1 from the apex of the convex portion t1 at the position of the apex p1 in the width direction of the convex portion t1 in the longitudinal direction to the high basis weight portion 11f located on the outside (one side) in the width direction of the convex portion t1. By making the length dp2 longer than the length dp1, it becomes easier to promote diffusion in the second adjacent portion 11nb on the inside in the width direction of the center ch of the second opening 11hb than when the length dp2 is longer than the length dp1, so that it becomes easier to diffuse excrement in the longitudinal direction on the inside in the width direction of the center ch of the second opening 11hb. On the other hand, since the second adjacent portion 11nb is a portion softer than the high basis weight portion 11f, by making the length dp1 shorter than the length dp2, it is possible to reduce the risk of deformation of the shape of one side (outside in the width direction) of the center ch in the width direction of the thickness of the second opening 11hb in comparison with when the length dp1 is longer than the length dp2, even if a force is applied to the napkin 1 from the outside in the width direction.

As shown in FIG. 3, it is preferable that the center SC in the thickness direction of the joint 12s is provided on the non-skin side of the center in the thickness direction of the napkin 1. When the napkin 1 absorbs excrement while being worn, the excrement absorbed in the crotch area CA of the absorbent core 11 and in the center in the width direction can be dispersed by the skin side sheet portion 12a and the non-skin side sheet portion 12b provided at a position overlapping with the second opening 11hb in the thickness direction when it reaches the edge of the second opening 11hb. At this time, by providing the center SC in the thickness direction of the joint 12s on the non-skin side of the center in the thickness direction of the napkin 1, it is easier to disperse excrement in the non-skin side part in the thickness direction than when the center SC in the thickness direction of the joint 12s is provided on the skin side of the center in the thickness direction of the napkin 1. Therefore, it is possible to reduce the risk that the excrement absorbed by the napkin 1 will continue to contact the wearer's skin, which makes it easier to reduce discomfort to the wearer.

As shown in FIG. 3, it is preferable that the joint 12s and the back sheet 31 are spaced apart in the thickness direction. The napkin 1 is fixed to clothing by the main body adhesive portion 32 provided on the non-skin side of the back sheet 31 located on the non-skin side of the non-skin side sheet portion 12b, and the absorbent core 11 is easily moved according to the shape and movement of the wearer's body by providing the joint 12s spaced apart from the back sheet 31. In other words, when the napkin 1 is worn, the joint 12s spaced apart from the back sheet 31 and the portion corresponding to the second opening 11hb of the absorbent core 11 are less susceptible to the influence of the fixation to clothing, and are easily deformed and moved according to the shape and movement of the wearer's body. This improves the fit when worn and improves comfort when worn. In addition, the force transmitted from the clothing when worn and the force due to the shape and movement of the wearer's body can be reduced from being applied to the joint 12s and the second opening 11hb, reducing the risk of the second opening 11hb being crushed by these forces. By maintaining the through shape of the second opening 11hb, it becomes easier to promote diffusion toward the outside in the longitudinal direction in the napkin 1 rather than toward the outside in the width direction, reducing the risk of excrement leaking from the outside in the width direction of the napkin 1.

As shown in Figure 5, etc., the length (thickness) in the thickness direction of the absorbent core 11 is 11T, and it is preferable that the amount of liquid absorbent fiber in the second adjacent portion 11nb located on the skin side of the center 11tc (1/2 of 11T) in the thickness direction of the absorbent core 11 is greater than the amount of liquid absorbent fiber in the second adjacent portion 11nb located on the non-skin side of the center 11tc in the thickness direction of the absorbent core. As a result, even when excrement absorbed from the skin side of the absorbent core 11 in the crotch region CA and at the center in the width direction spreads horizontally when the napkin 1 is worn, the liquid absorbent fibers of the second adjacent portion 11nb adjacent to the second opening 11hb are more likely to be located on the skin side than the center 11tc in the thickness direction of the absorbent core 11, and the risk of excrement spreading inside the second opening 11hb is reduced, compared to when the amount of liquid absorbent fibers in the second adjacent portion 11nb located closer to the skin than the center 11tc in the thickness direction of the absorbent core 11 is less than the amount of liquid absorbent fibers in the second adjacent portion 11nb located away from the skin side of the absorbent core 11 As a result, in the napkin 1, diffusion toward the outside in the longitudinal direction is more likely to be promoted than diffusion toward the outside in the width direction, reducing the risk of excrement leaking out from the outside in the width direction of the napkin 1.

The napkin 1 also has a linear compression portion EL, which compresses at least the top sheet 21, the skin-side sheet portion 12a, and the non-skin-side sheet portion 12b in the thickness direction. This linear compression portion EL is preferably along the longitudinal direction, and preferably has a portion where the second opening 11hb and the linear compression portion EL overlap in the thickness direction. Specifically, in the napkin 1 of this embodiment, as shown in FIG. 7, etc., in the portion where the high basis weight portion 11f and the adjacent portion 11n overlap in the thickness direction, the linear compression portion EL compresses the top sheet 21, the second sheet 22, the skin-side sheet portion 12a, the absorbent core 11, and the non-skin-side sheet portion 12b in the thickness direction, and in the portion where the opening 11h overlaps in the thickness direction, the linear compression portion EL compresses the top sheet 21, the second sheet 22, the skin-side sheet portion 12a, and the non-skin-side sheet portion 12b in the thickness direction. By providing the linear compression portion EL at a position overlapping with the second opening 11hb in the thickness direction, the risk of the absorbent core 11 and the napkin 1 becoming excessively hard can be reduced compared to when the linear compression portion EL is provided only at a position not overlapping with the second opening 11hb. In addition, since the linear compression portion EL compressed in the thickness direction increases the fiber density of each member, even if the excrement reaches the inside of the second opening 11hb, the capillary phenomenon makes it easier to promote the diffusion of the excrement in the longitudinal direction along the linear compression portion EL along the longitudinal direction. Furthermore, the linear compression portion EL provided at a position overlapping with the second opening 11hb makes it easier to make the joint 12s (the joint between the skin side sheet portion 12a and the non-skin side sheet portion 12b) stronger, making it easier to deform the absorbent core 11 integrally with the skin side sheet portion 12a and the non-skin side sheet portion 12b, thereby reducing the discomfort felt by the wearer.

7, the second opening 11hb located on one side in the width direction has an outer curved opening 11hbs that curves outward in the width direction, and preferably has an outer curved compressed portion ELs that curves outward in the width direction at a position (crotch area CA) where it overlaps with the wing adhesive portion 33 in the longitudinal direction. By having a portion where the linear compressed portion EL overlaps with the second opening 11hb in the thickness direction, the risk of the napkin 1 becoming excessively hard is reduced, while by making the linear compressed portion EL a shape that follows the shape of the second opening 11hb at a position where it overlaps with the wing adhesive portion 33 in the longitudinal direction, it becomes easier to provide a wider range in which the linear compressed portion EL compresses the joint portion 12s inside the second opening 11hb in the thickness direction. This makes it easier to make the joints 12s stronger, and makes it easier to deform the absorbent core 11 together with the skin-side sheet portion 12a and the non-skin-side sheet portion 12b, reducing the discomfort felt by the wearer.

Furthermore, like the napkin 1, it is preferable to have a first opening (front opening) 11ha in front of the second opening 11hb and a third opening (rear opening) 11hc behind the second opening 11hb, and it is preferable that the first opening 11ha, the second opening 11hb, and the third opening 11hc are provided at a distance from each other (Fig. 1, etc.). By providing not only the second opening 11hb but also the first opening 11ha and the third opening 11hc, it becomes easier to promote the diffusion of excrement in the longitudinal direction even in front and behind the part overlapping with the wing adhesive part 33 in the longitudinal direction of the napkin 1. In addition, by having each opening 11ha, 11hb, and 11hc spaced apart from each other, it is possible to reduce the risk that all the openings 11ha, 11hb, and 11hc will be crushed together due to external forces such as the shape and movement of the wearer's body when worn.

As shown in FIG. 1, in a napkin 1 having a first opening 11ha, a second opening 11hb, and a third opening 11hc, it is preferable that the linear compression portion EL along the longitudinal direction has a portion overlapping the first opening 11ha, the second opening 11hb, and the third opening 11hc when viewed in the thickness direction. As described above, the linear compression portion EL compresses at least the top sheet 21, the skin side sheet portion 12a, and the non-skin side sheet portion 12b in the thickness direction, and in the napkin 1 of this embodiment, in the portion overlapping each opening 11ha, 11hb, and 11hc in the thickness direction, the linear compression portion EL compresses the top sheet 21, the second sheet 22, the skin side sheet portion 12a, and the non-skin side sheet portion 12b in the thickness direction. By providing the linear compressed portions EL at positions that overlap with the openings 11ha, 11hb, and 11hc when viewed in the thickness direction, it is possible to reduce the risk of the absorbent core 11 and the napkin 1 becoming excessively hard, compared to when the linear compressed portions EL are provided only at positions that do not overlap with the openings 11ha, 11hb, and 11hc. Furthermore, because the linear compressed portions EL compressed in the thickness direction increase the fiber density of each member, even if the excrement reaches the inside of each opening 11ha, 11hb, and 11hc, capillary action tends to encourage the excrement to diffuse in the longitudinal direction along the linear compressed portions EL that run in the longitudinal direction. Furthermore, the linear compression parts EL provided at positions overlapping with the openings 11ha, 11hb, and 11hc make it easier to strengthen the bond at the bonded parts 12s on the inside of the openings 11ha, 11hb, and 11hc (the bond between the skin side sheet part 12a and the non-skin side sheet part 12b), making it easier to deform the absorbent core 11 integrally with the skin side sheet part 12a and the non-skin side sheet part 12b, and reducing the discomfort felt by the wearer.

===Other embodiments===
Although the embodiment of the present invention has been described above, the above embodiment is intended to facilitate understanding of the present invention and is not intended to limit the present invention. Furthermore, the present invention may be modified or improved without departing from the spirit of the present invention, and it goes without saying that the present invention includes equivalents thereof.

9 is a diagram illustrating a modified example of the absorbent core 11. As shown in FIG. 9, the length (thickness) in the thickness direction of the absorbent core 11 is 11T, and the amount of liquid absorbent fiber in the second adjacent portion 11nb located on the non-skin side of the center 11tc (1/2 of 11T) in the thickness direction of the absorbent core 11 may be greater than the amount of liquid absorbent fiber in the second adjacent portion 11nb located on the skin side of the center 11tc in the thickness direction of the absorbent core. This makes it easier to diffuse excrement absorbed by the absorbent core 11 at a position away from the wearer's skin when the napkin 1 is worn, compared to when the amount of liquid absorbent fiber in the second adjacent portion 11nb located on the non-skin side of the center 11tc in the thickness direction of the absorbent core 11 is less than the amount of liquid absorbent fiber in the second adjacent portion 11nb located on the skin side of the center 11tc in the thickness direction of the absorbent core 11. Specifically, when the excrement absorbed in the widthwise center of the crotch region CA of the absorbent core 11 reaches the second adjacent portion 11nb, it is more likely to be dispersed on the non-skin side in the second adjacent portion 11nb than the center 11tc in the thickness direction of the absorbent core 11. This reduces the risk that the excrement once absorbed by the wearer's skin will come into contact with the wearer's skin again, making it easier to reduce discomfort when wearing the garment.

In the above embodiment, the openings 11h are arranged in the longitudinal direction as a pair of second openings 11hb at positions overlapping the wing adhesive portion 33 in the longitudinal direction, but this is not limited to this. The pair of second openings 11hb provided at positions overlapping the wing adhesive portion 33 may have a first opening (not shown) and a second opening (not shown) spaced apart in the longitudinal direction. Specifically, the second opening 11hb on one side (or the other side) in the width direction shown in FIG. 1 etc. may be divided into two or more in the longitudinal direction, and a configuration may be provided with multiple openings 11h (multiple second openings 11hb) at positions overlapping the wing adhesive portion 33. This reduces the risk that all of the second openings 11hb will be crushed in the width direction as a whole due to external forces such as the shape and movement of the wearer's body when worn. In addition, during the manufacturing process of the napkin 1, when the absorbent core 11 is molded, the risk of liquid-absorbent fibers leaking into the second opening 11hb from the area adjacent to the second opening 11hb and losing the shape of the entire second opening 11hb being integrally penetrated can be reduced.

In the napkin 1 of the above-mentioned embodiment, the skin-side sheet portion and non-skin-side sheet forming the joint 12s are the core wrap sheet 12 (skin-side sheet portion 12a, non-skin-side sheet portion 12b), but this is not limited to this. For example, the absorbent body 10 (napkin 1) may be configured not to include the core wrap sheet 12. If the absorbent body 10 does not include the core wrap sheet 12, the second sheet 22 or the top sheet 21 located closer to the skin than the absorbent core 11 can be the skin-side sheet portion, and the back sheet 31 can be the non-skin-side sheet portion.

In the above embodiment, the absorbent core 11 has adjacent portions 11na, 11nb, 11nc that are adjacent from the outside to the contours of all the openings 11ha, 11hb, 11hc, but this is not limited to this. It is sufficient that the absorbent core 11 has a second adjacent portion 11nb that is adjacent from the outside to the contour of the second opening 11hb provided at a position that overlaps with the wing adhesive portion 33 at least in the longitudinal direction, and it does not necessarily have to have the first adjacent portion 11na and the third adjacent portion 11nc. However, by having the first adjacent portion 11na and the third adjacent portion 11nc located in front and behind the second adjacent portion 1nb, the absorbent core 11 is more likely to promote the diffusion of excrement in the longitudinal direction.

In the above embodiment, the first adjacent portion 11na, the second adjacent portion 11nb, and the third adjacent portion 11nc are provided so as to surround the entire contours of the first opening 11ha, the second opening 11hb, and the third opening 11hc, respectively, but this is not limited to this. The first adjacent portion 11na, the second adjacent portion 11nb, and the third adjacent portion 11nc may be adjacent to at least a part of the contours of the first opening 11ha, the second opening 11hb, and the third opening 11hc.

In the above embodiment, the pair of openings 11h and the linear compression portion EL are each symmetrically shaped and positioned with respect to the center C-C in the width direction, but this is not limited to the above. The pair of openings 11h and the linear compression portion EL may each be asymmetrically shaped and positioned with respect to the center C-C in the width direction.

Furthermore, in the above embodiment, one first opening 11ha and one first adjacent portion 11na, one second opening 11hb and one second adjacent portion 11nb, and one third opening 11hc and one third opening 11nc are provided on one side (or the other side) of the pair of openings 11h of the absorbent core 11, but this is not limited to this. For example, a configuration may be provided in which two first openings 11ha and one first adjacent portion 11na, two second openings 11hb and one second adjacent portion 11nb, and two third openings 11hc and one third adjacent portion 11nc are provided side by side in the width direction on one side (or the other side).

1. Napkins (sanitary absorbent articles),
1W wing section,
10 absorbent body,
11 absorbent core,
11h opening,
11ha first opening (front opening),
11hb second opening (opening),
11hc third opening (rear opening),
11d Middle and high school,
11f high basis weight part,
11n adjacent part,
11na first adjacent portion,
11nb second adjacent portion,
11nc third adjacent part,
12 core wrap sheet,
12a skin side sheet portion,
12b non-skin side sheet portion,
12s joint,
21 Top sheet (surface sheet),
22 Second seat,
23 Side seat,
24 Reinforcing sheet,
31 back sheet,
32 Main body adhesive part,
33 Wing adhesive part,
CA crotch area,
ee circular compression part,
EL linear compression portion,
t Convex part

Claims (14)

A longitudinal direction, a width direction, and a thickness direction,
an absorbent core having liquid-absorbent fibers;
a skin-side sheet portion located on the skin side of the absorbent core;
a non-skin-side sheet portion located on the non-skin-side side of the absorbent core;
A pair of wing portions extending outwardly in the width direction;
having
a pair of wing portions each having a wing adhesive portion coated with an adhesive on a non-skin side in the thickness direction,
The absorbent core has a pair of openings extending through the thickness direction and along the longitudinal direction,
At least a portion of the opening is provided at a position overlapping with the wing adhesive portion in the longitudinal direction,
a contiguous portion that is contiguous with the contour of the opening from the outside;
a high basis weight portion adjacent to the adjacent portion from the outside and having a basis weight of the liquid absorbent fiber higher than that of the adjacent portion;
a joint portion at which the skin side sheet portion and the non-skin side sheet portion are joined together at a position overlapping the opening when viewed in the thickness direction,
In the absorbent core,
A sanitary absorbent article, characterized in that the density of the liquid absorbent fibers in the entire high basis weight portion is higher than the density of the liquid absorbent fibers in the adjacent portion. 2. The sanitary absorbent article according to claim 1,
a back sheet located on the non-skin side of the non-skin side sheet portion,
The back sheet has a main adhesive portion on a non-skin side to which an adhesive is applied,
A sanitary absorbent article, characterized in that, when viewed in the thickness direction, each of the openings has a portion overlapping with the main adhesive portion. The sanitary absorbent article according to claim 1 or 2,
A sanitary absorbent article, characterized in that the pair of openings are spaced apart in the width direction. The sanitary absorbent article according to claim 1 or 2,
A sanitary absorbent article, characterized in that the adjacent portion has a convex portion protruding toward the adjacent opening. The sanitary absorbent article according to claim 4,
In the convex portion,
The basis weight of the liquid absorbent fiber on the tip side of the protrusion in the width direction is
A sanitary absorbent article, characterized in that the basis weight of the liquid absorbent fibers on the base side of each of the protrusions in the width direction is lower than that of the liquid absorbent fibers on the base side of each of the protrusions in the width direction. The sanitary absorbent article according to claim 1 or 2,
A sanitary absorbent article, characterized in that the center of the joint in the thickness direction is located on the non-skin side of the center of the sanitary absorbent article in the thickness direction. The sanitary absorbent article according to claim 1 or 2,
a back sheet located on the non-skin side of the non-skin side sheet portion,
The back sheet has a main adhesive portion on a non-skin side to which an adhesive is applied,
A sanitary absorbent article, characterized in that the joint portion and the back sheet are spaced apart in the thickness direction. The sanitary absorbent article according to claim 1 or 2,
The amount of the liquid absorbent fibers in the adjacent portion located closer to the skin than the center in the thickness direction of the absorbent core is
A sanitary absorbent article characterized in that the amount of liquid absorbent fibers is greater than the amount of liquid absorbent fibers in the adjacent portion located on the non-skin side of the center in the thickness direction of the absorbent core. The sanitary absorbent article according to claim 1 or 2,
The amount of the liquid absorbent fibers in the adjacent portion located on the non-skin side from the center in the thickness direction of the absorbent core is
A sanitary absorbent article characterized in that the amount of liquid absorbent fibers is greater than that of the adjacent portion located closer to the skin than the center in the thickness direction of the absorbent core. The sanitary absorbent article according to claim 1 or 2,
a top sheet located closer to the skin than the skin side sheet portion;
a compression section that compresses at least the top sheet, the skin side sheet portion, and the non-skin side sheet portion in the thickness direction;
The compression portion is along the longitudinal direction,
A sanitary absorbent article characterized in that, when viewed in the thickness direction, there is a portion where the opening and the compressed portion overlap. 11. The sanitary absorbent article according to claim 10,
The opening located on one side in the width direction includes an outer curved opening curved outward in the width direction,
A sanitary absorbent article, characterized in that the compressed portions have outer curved compressed portions that curve outward in the width direction at positions that overlap with the wing adhesive portions in the longitudinal direction. The sanitary absorbent article according to claim 1 or 2,
The sanitary absorbent article according to claim 1, wherein the opening comprises a first opening and a second opening spaced apart in the longitudinal direction. The sanitary absorbent article according to claim 1 or 2,
a front opening on the front side of the opening and a rear opening on the rear side of the opening,
A sanitary absorbent article, characterized in that the front opening, the opening and the rear opening are provided spaced apart from each other. 14. The sanitary absorbent article according to claim 13,
a top sheet located closer to the skin than the skin side sheet portion;
a compression section that compresses at least the top sheet, the skin side sheet portion, and the non-skin side sheet portion in the thickness direction;
The compression portion is along the longitudinal direction,
A sanitary absorbent article characterized in that, when viewed in the thickness direction, each of the compressed portions has a portion overlapping the opening, the front opening, and the rear opening.

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