WO2018123304A1

WO2018123304A1 - Absorbent article

Info

Publication number: WO2018123304A1
Application number: PCT/JP2017/040893
Authority: WO
Inventors: 工藤　淳; 健太谷口; 望前谷
Original assignee: ユニ・チャーム株式会社
Priority date: 2016-12-28
Filing date: 2017-11-14
Publication date: 2018-07-05
Also published as: JP2018102828A; TW201832746A; JP6749233B2

Abstract

An absorbent article (1) has an absorption body (10) comprising liquid-absorbent fibers, and has mutually orthogonal longitudinal, width, and thickness directions. The absorption body (10) has a longitudinal-direction recess (15) in a center region that includes a width-direction center position. The fiber density of a skin-side area (H) that is adjacent to the recess (15) on a skin side in the thickness direction is higher than the fiber density of outside areas (L) that are adjacent to the recess (15) on the outsides in the width direction. The fiber density of the skin-side area (H) at a crotch area that is positioned at a crotch during wear is higher than the fiber density of the skin-side area (H) at one longitudinal-direction end part.

Description

Absorbent articles

The present invention relates to an absorbent article.

Sanitary napkins are known as absorbent articles that absorb excreted fluid such as menstrual blood. As an example of such a sanitary napkin, in Patent Document 1, when subjected to the influence of lateral compression, an absorbent core is formed along a forming line 20 having a central vertical line 22 provided in the absorbent core 12. A sanitary napkin 10 is disclosed in which 12 is bent upward (skin side) to improve body fit.

Japanese translation of PCT publication No. 2002-538849

However, the forming line 20 of the sanitary napkin 10 of Patent Document 1 is provided in the central portion (crotch region) in the vertical direction, and the upward bending of the absorbent core 12 is reduced when worn, so that the wearer There is a risk that the fit to the body will be reduced. In order to improve this, for example, if the forming line 20 is formed longer than the central portion in the longitudinal direction, the wearer feels uncomfortable, such as the absorbent body bent upward (skin side) hits the abdomen or buttocks of the wearer. There was a risk of causing.

The present invention has been made in view of the above-described problems, and provides an absorbent article that improves the fit property corresponding to the shape of the wearer's body.

The main invention for achieving the above object is:
An absorbent article having an absorbent body having a longitudinal direction, a width direction, and a thickness direction orthogonal to each other and having liquid absorbent fibers, wherein the absorbent body is in a central region including a central position in the width direction. The fiber density of the skin side part which has a crevice along the longitudinal direction, and adjoins the crevice from the skin side in the thickness direction is more than the fiber density of the outside part adjoining the crevice from the outside in the width direction The absorbent article is characterized in that the fiber density of the skin side part in the crotch part located at the crotch part is higher than the fiber density of the skin side part at one end in the longitudinal direction.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

According to the present invention, the higher the fiber density is, the higher the rigidity is, and the fiber density of the skin side part in the crotch part that is in contact with the user's excretion opening is the fiber of the skin side part at one end in the longitudinal direction. By being higher than the density, in the longitudinal crotch region, it is easy to bend and deform so as to rise to the skin side, while the one end in the longitudinal direction easily conforms to the shape of the abdomen or buttocks of the wearer's body. Thus, the bending deformation can be moderated.

FIG. 1 is a front view of the sanitary napkin 1 as viewed from the skin side in the thickness direction. FIG. 2 is a plan view of the napkin 1 viewed from the non-skin side in the thickness direction. FIG. 3 is a schematic cross section taken along line AA in FIG. FIG. 4 is a plan view of the absorbent body 10 of the napkin 1 as viewed from the non-skin side in the thickness direction. FIG. 5A is a schematic cross-sectional view in which the absorbent body point-like compressed portion ED10 is formed in the absorbent body 10 before processing in the portion indicated by the arrow BB in FIG. FIG. 5B is a schematic cross-sectional view in which a recess 15 is formed in the absorbent body 10 of FIG. 5A. FIG. 5C is a schematic cross-sectional view in which a top sheet 20 is laminated on the absorbent body 10 of FIG. 5B. FIG. 5D is a schematic cross-sectional view in which a main body squeezed portion ED20 is formed on the napkin 1 of FIG. 5C. FIG. 6 is a schematic enlarged view of the pair of roll portions 50. FIG. 7 is a diagram illustrating a usage mode of the napkin 1. FIG. 8A is a schematic cross-sectional view of the recess 15 in FIG. 5D. FIG. 8B is an enlarged view of a portion Z in FIG. 8A. FIG. 9A is a diagram illustrating the recess 15 of the napkin 1 before use. FIG. 9B is a diagram illustrating the recess 15 of the napkin 1 in a worn state. FIG. 10A is a schematic cross-sectional view of the recess 15 in the crotch region. FIG. 10B is a schematic cross-sectional view of the recess 15 at the rear side. FIG. 11 is a modification of the pair of roll portions 50.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
An absorbent article having an absorbent body having a longitudinal direction, a width direction, and a thickness direction orthogonal to each other and having liquid absorbent fibers, wherein the absorbent body is in a central region including a central position in the width direction. The fiber density of the skin side part which has a crevice along the longitudinal direction, and adjoins the crevice from the skin side in the thickness direction is more than the fiber density of the outside part adjoining the crevice from the outside in the width direction The absorbent article is characterized in that the fiber density of the skin side part in the crotch part located at the crotch part is higher than the fiber density of the skin side part at one end in the longitudinal direction.

According to such an absorbent article, the higher the fiber density, the higher the rigidity, and the fiber density of the skin side part in the crotch part that is in contact with the user's excretion opening is the skin at one end in the longitudinal direction. By being higher than the fiber density of the side part, in the crotch part in the longitudinal direction, it is easy to bend and deform so as to rise to the skin side, while one end part in the longitudinal direction is the shape of the abdomen or buttocks of the wearer's body The bending deformation can be made gentle so that it can be easily along.

In such an absorbent article, the center in the thickness direction of the absorbent body at a position overlapping the deepest deepest part of the recess in the crotch part in the width direction is at a position overlapping the outer part in the width direction, It is desirable that the absorber is located on the skin side from the center in the thickness direction.

According to such an absorbent article, when worn, it becomes easy to bend so that the crotch region protrudes to the skin side, and it becomes easy to fit into the excretion opening, and it becomes easier to absorb excretion more quickly.

In such an absorbent article, it is desirable that the recess is provided from one end to the other end of the absorbent body in the longitudinal direction.

According to such an absorbent article, the end part in the longitudinal direction of the absorbent body is looser than the crotch part depending on the shape of the abdomen or the buttocks of the wearer while the crotch part is fitted to the wearer's excretion opening. Deformation makes it easier to fit the body.

In such an absorbent article, the mass of the liquid absorbent fiber per unit area of the skin side site in the crotch region is greater than the mass of the liquid absorbent fiber per unit area of the skin side site in the one end. It is desirable.

According to such an absorbent article, since the mass of the liquid absorbent fiber per unit area of the skin side site in the crotch region is larger than the mass of the liquid absorbent fiber per unit area of the skin side site in the one end, More excrement can be absorbed at the site.

In such an absorbent article, it is desirable that a cross-sectional shape of the concave portion along the width direction at the crotch portion is different from a cross-sectional shape of the concave portion along the width direction at the one end portion.

According to such an absorbent article, the change in the shape of the crotch part of the absorbent body during wear and the change in the shape of the one end part are different because the cross-sectional shape of the recess in the crotch part and the recess in the one end part are different. be able to.

In such an absorbent article, it is desirable that the deepest deepest portion of the concave portion in the crotch region is deeper than the deepest deepest portion of the concave portion in the one end portion.

According to such an absorbent article, since the deepest part of the recess in the crotch part is deeper, the crotch part can be easily deformed so that the absorbent body protrudes to the skin side, and the deepest part of the recess in one end part Is shallower, the deformation of the absorber can be more moderate at one end.

In such an absorbent article, in the crotch region, a pair of skin side recesses along the longitudinal direction is provided on the skin surface side of the absorber, and in the width direction, the pair of skin side recesses are It is desirable that it is shallower than the deepest deepest part of the concave part and is provided on both outer sides of the deepest part, and the skin side concave part is not provided at the one end part.

According to such an absorbent article, in the crotch region, when the absorbent body is deformed so as to rise to the skin side by the concave portion formed on the non-skin side surface, the region between the respective skin side concave portions is worn. It becomes easy to hit the person's skin. At this time, since it can be made to contact a wearer's skin in the area | region nearer a plane than the one end part which does not provide a pair of skin side recessed part, skin contact can be improved.

In such an absorbent article, it is desirable that the crotch region is not provided with a pressing part that crosses the recess in the width direction.

In the crotch part, if a pressing part that crosses the concave part in the width direction is provided, there is a possibility that the deformation that causes the absorber to rise to the skin side by the concave part in the crotch part may be hindered. However, in the crotch region, by not providing a pressing part that crosses the concave part in the width direction, the concave part in the crotch region makes it easier to raise the absorbent body to the skin side, and fits the absorbent body to the wearer's excretion opening It becomes easy.

=== First Embodiment ===
<Basic configuration of sanitary napkin 1>
A sanitary napkin 1 (hereinafter referred to as “napkin 1”) will be described as an example of the absorbent article according to the present embodiment. In the following description, a sanitary napkin will be described as an example of the absorbent article, but the absorbent article of the present embodiment also includes a so-called cage sheet (for example, a panty liner) and the like. It is not limited to napkins.

FIG. 1 is a front view of the sanitary napkin 1 as seen from the skin side in the thickness direction. FIG. 2 is a plan view of the napkin 1 viewed from the non-skin side in the thickness direction. FIG. 3 is a schematic cross section taken along line AA in FIG. In the following description, the “longitudinal direction” along the product longitudinal direction of the napkin 1, the “width direction” orthogonal to the longitudinal direction along the product lateral direction of the napkin 1, the longitudinal direction and the width direction, respectively. It is defined as the “thickness direction” orthogonal to each other. The longitudinal direction has a “front side” that is the stomach side of the wearer when the napkin 1 is used, and a “rear side” that is the back side of the wearer. The thickness direction is the “skin side” (also referred to as “upper side”), which is the side that contacts the wearer's skin when the napkin 1 is worn (also referred to as “upper side”), and the opposite side (lower side in FIG. 3). And “non-skin side” (also referred to as “lower side”). Further, the XX line in the figure is a center line in the width direction.

The napkin 1 is a sheet-like member having a vertically long shape in plan view, a liquid-permeable top sheet (skin-side sheet) 20, a liquid-absorbing absorber 10, and a liquid-impermeable back sheet (non-skin-side sheet). 30) are laminated in order from the skin side to the non-skin side in the thickness direction (see FIG. 3). Each of the

members

20, 10, and 30 is joined to a member adjacent in the thickness direction with an adhesive HMA such as a hot melt adhesive. The adhesive HMA is applied in an arbitrary application pattern over the entire skin side and non-skin side of the absorbent body 10, and is selected from application patterns such as an Ω pattern, a spiral pattern, and a stripe pattern. be able to.

The planar shape of the top sheet 20 and the back sheet 30 is the same shape, and the planar size is larger than the planar size of the absorbent body 10. And as shown in FIG.1 and FIG.2, the absorber 10 hold | maintains between both

sheets

20 and 30 by joining the outer-

periphery edge parts

20e and 30e of both

sheets

20 and 30 by adhesion | attachment or welding. Is done. In addition, the wing part, which is a fixing part provided when the napkin 1 is placed and fixed on an undergarment (not shown), has a substantially central portion in the longitudinal direction of the top sheet 20 and the back sheet 30 extending outward in the width direction. 20w and 30w are formed.

The absorbent body 10 has an absorbent core 11, an upper sheet 12, and a lower sheet 13. The absorptive core 11 is a member that absorbs and holds liquid (excretion fluid) such as menstrual blood. The absorbent core 11 has cellulosic absorbent fibers, which are liquid absorbent fibers, and thermoplastic resin fibers, and these fibers are mixed with each other in a plan view as shown by a broken line in FIG. It is formed into a vertically long shape. For example, pulp fibers or the like are used as the liquid absorbent fibers, and composite fibers having a so-called sheath core structure in which the sheath is polyethylene (PE) and the core is polyethylene terephthalate (PET) are used as the thermoplastic resin fibers. In addition, a rayon fiber may be used as this liquid absorptive fiber, and a single fiber of polypropylene (PP) or a single fiber of PE may be used as the thermoplastic resin fiber. Moreover, you may add liquid absorptive granular materials, such as a superabsorbent polymer (what is called SAP), to a liquid absorptive fiber.

The upper sheet 12 is a sheet member having substantially the same shape as the absorbent core 11 and is joined by an adhesive HMA so as to cover the skin side surface of the absorbent core 11 (FIG. 3). As the upper sheet 12, a flexible sheet having excellent liquid permeability such as a nonwoven fabric such as an air-through nonwoven fabric or a tissue paper is used. The lower sheet 13 is a sheet member having substantially the same planar shape as the absorbent core 11 and is joined by an adhesive HMA so as to cover the non-skin side surface of the absorbent core 11 (FIG. 3). The lower sheet 13 is made of a non-woven fabric such as SMS (spunbond / meltblown / spunbond) non-woven fabric or a flexible sheet such as tissue paper.

FIG. 4 is a plan view of the absorbent body 10 of the napkin 1 as viewed from the non-skin side in the thickness direction. FIG. 4 shows the outline of the napkin 1 with a dotted line for convenience. The absorbent body 10 is provided with a plurality of absorbent body point compression parts ED10 in order to increase the rigidity of the absorbent body 10 and improve the absorbability and diffusibility of the liquid. The planar shape of the absorber squeezed pressing part ED10 is substantially circular and is a staggered arrangement pattern, but is not limited to this. Further, the thickness of the absorbent body 10 is 3 mm or less, desirably 2 mm or less, and the fiber density of the absorbent body 10 is 1.0 × 10 ⁵ to 4.0 × 10 ⁵ (g / m ³ ), which is generally uniform. It is. However, the mass of the fiber per unit area of the absorbent body 10 is different between the front side portion, the center portion, and the rear side portion in the longitudinal direction. In this embodiment, the mass (weight) per unit area (hereinafter also referred to as “the mass of the fiber per unit area”) of the liquid absorbent fiber is 175 (g / m ² ) on the front side, and the center is 250 (g / m ² ), the rear side portion is 175 (g / m ² ), the mass of fibers per unit area in the central portion is the largest, and the thickness (tb10) of the absorber 10 in the front side portion and the rear side portion ), The thickness of the absorber 10 (t10) at the center is larger (t10> tb10).

In addition, by making the mass of the fiber per unit area of the central part including the crotch region (described later) larger than the mass of the fiber per unit area of the rear side part including the rear end part of the napkin 1 The excrement absorbed in the central portion in the longitudinal direction of the absorbent body 10 is more outward than the widthwise end of the absorbent body 10 so that more excrement can be absorbed in the crotch region in contact with the wearer's excretion opening. This reduces the risk of leaks.

Each thickness of the front side part, the center part, and the rear side part of the absorbent body 10, the mass of the fiber per unit area, and the density of the liquid absorbent fiber (also referred to as “fiber density”) can be measured by a known method. it can. For example, each thickness is a dial thickness gauge ID-C1012C manufactured by Mitutoyo Corporation or equivalent, and the contact area is set to 20 cm ² and the contact pressure is set to ³ gf / cm ² to add the target part. It may be measured by pressing, or may be compared visually, or may be compared using an image obtained by photographing a cross section of the napkin 1 cut in the longitudinal direction. The mass of the fiber per unit area is determined by, for example, cutting the target part from the napkin 1 as the target sample, and measuring the mass of the target sample with a direct balance (for example, electronic balance HF-300 manufactured by Kensei Kogyo Co., Ltd.). Alternatively, the area of the target sample may be measured to calculate the mass per unit area. For example, the density of the fiber is obtained by cutting the target part from the napkin 1 as a target sample, measuring the mass (g / m ² ) per unit area of the target sample with the above-described measurement method, and measuring the thickness of the target sample with the above-described measurement method. It can be calculated by measuring (m) and dividing the mass per unit area of the target sample by the thickness of the target sample (g / m ³ ).

Furthermore, the linear recessed part 15 along the longitudinal direction is formed in the center area | region of the width direction in the non-skin side surface of the absorber 10. FIG. The concave portion 15 is provided in a substantially linear shape over the entire length in the longitudinal direction of the absorbent body 10 including at least the crotch portion located at the crotch portion when worn. The “groin region” is a region located in the crotch portion when the wearer uses the napkin 1, and specifically, a region where the wing adhesive portion 40 w is formed in the longitudinal direction of the napkin 1. Say. The concave portion 15 is guided so as to protrude and bend toward the skin side in the thickness direction when worn. Details of the recess 15 will be described later.

The top sheet 20 is a member that comes into contact with the skin of the wearer when the napkin 1 is used, and allows liquid such as menstrual blood to permeate from the skin side in the thickness direction to the non-skin side and move to the absorbent body 10. As the top sheet 20, a liquid-permeable flexible sheet of an appropriate nonwoven fabric such as an air-through nonwoven fabric is used.

As shown in FIG. 1, a plurality of pressing parts (a linear pressing part EL and a main body point pressing part ED20) are formed on the skin side surface of the top sheet 20 from the skin side. And the absorber 10 are squeezed together in the thickness direction and joined and integrated. A plurality of linear compressed portions EL are formed in a row along the outer peripheral edge of the absorbent body 10 and have a substantially annular shape that is long in the longitudinal direction as a whole. The linear compression part EL is provided in the center part of a longitudinal direction, is provided in a front side of a pair of linear compression part ELc of the shape along a longitudinal direction, and the absorber 10, The external shape of the edge part of the front side of the napkin 1 is provided. The linear pressing part ELf having a shape along the line, the linear pressing part ELb having a shape along the outer shape of the rear end part of the napkin 1 provided on the rear side of the absorbent body 10, and the linear pressing part ELc, A pair of linear pressing portions ELm provided between the linear pressing portions ELb and having a shape along the longitudinal direction are provided. On the other hand, the main body point squeezed portion ED20 is substantially circular, and is formed discretely in a substantially closed region where the linear squeezed portion EL is partitioned on the top sheet 20.

The back sheet 30 suppresses the liquid permeated through the top sheet 20 and absorbed by the absorbent body 10 when the napkin 1 is used from exuding to the clothing side (non-skin side) such as underwear. As the back sheet 30, a liquid-impermeable flexible sheet of an appropriate resin film such as polyethylene (PE) is used.

As shown in FIG. 2, on the non-skin surface side of the back sheet 30, there are adhesive portions (a wing adhesive portion 40 w and a main body adhesive portion 40 c) for attaching and fixing the napkin 1 to underwear or the like when the napkin 1 is used. Is provided. The wing bonding portion 40w is a pair of bonding portions formed in a substantially rectangular shape on the non-skin surface side of the wing portion 30w. The main body bonding portion 40c is an appropriate adhesive in a plurality of band-like regions along the longitudinal direction in the portion between the width direction of the pair of wing bonding portions 40w, where the back sheet 30 and the absorbent body 10 overlap. It is formed by applying HMA. When the napkin 1 is used, the absorbent body 10 is positioned with respect to the wearer's body by attaching the napkin 1 together with the underwear while the main body adhesive portion 30c is attached to the inside of the crotch portion (crotch portion) of the underwear. Do not slip. Similarly, the wing bonding part 40w is formed by applying an appropriate adhesive HMA to a substantially rectangular area in the area of the wing part 30w. When using the napkin 1, the napkin 1 is fixed so that the wing 30w (20w) is bent to the non-skin side and the wing adhesive portion 40w is stuck to the outside of the crotch of the underwear. Suppress etc.

<Regarding the formation of the point-like compressed parts ED10, ED20, and the recess 15>
Then, formation of the point-like pressing parts ED10, ED20, and the recessed part 15 is demonstrated. Absorber point squeezing part ED10 and main part point squeezing part ED20 are provided by pressing in the thickness direction from the skin side or non-skin side, and at least the skin side or non-skin side is dented. The concave portion 15 is a linear compressed portion along the longitudinal direction, and is provided in a central region including the center line XX in the width direction of the absorbent body 10 (napkin 1). Has an area. Moreover, the recessed part 15 is a linear recessed part with which the non-skin side surface provided by pressing in the thickness direction from the non-skin surface side of the absorber 10 was dented.

FIG. 5A to FIG. 5D are diagrams illustrating the formation of the point compression parts ED10, ED20, and the recess 15. FIG. 5A is a schematic cross-sectional view in which the absorbent body point-like compressed portion ED10 is formed in the absorbent body 10 before processing in the portion indicated by the arrow BB in FIG. FIG. 5B is a schematic cross-sectional view in which a recess 15 is formed in the absorbent body 10 of FIG. 5A. FIG. 5C is a schematic cross-sectional view in which a top sheet 20 is laminated on the absorbent body 10 of FIG. 5B. FIG. 5D is a schematic cross-sectional view in which a main body squeezed portion ED20 is formed on the napkin 1 of FIG. 5C. The absorbent body 10 in FIG. 5A is the part of the absorbent body 10 as indicated by arrows BB in FIG. 1, and the absorbent body before processing before forming the point-like compressed parts ED10, ED20 and the recess 15 is shown in FIG. FIG. 5B shows a state in the middle of processing in which the recess 15 is formed in the absorbent body 10 of FIG. 5A, and FIG. 5D shows the state of the absorbent body 10. 2 shows the absorbent body 10 after processing in which the point-like compressed parts ED10 and ED20 and the recess 15 are formed, and is shown as the absorbent body 10 for convenience. 5A, FIG. 5B, and FIG. 5C, the yy line is the center line of the absorber 10 in the thickness direction, and YY in FIG. 5D is the center line of the napkin 1 in the thickness direction. . The center line YY is a center line in the thickness direction of the napkin 1, and is also a center line in the thickness direction of an outer region L of the absorber 10 described later.

First, the absorber point pressing part ED10 is formed. The absorbent body 10 before processing has a thickness t10 over the entire region, and the skin side surface of the absorbent body 10 is the skin side surface 10t, and the non-skin side surface is the non-skin side surface 10b. Pressing from the non-skin side of the absorbent body 10 through the absorbent body 10 before processing into a roll gap between a convex roller (not shown) having a plurality of protrusions and an anvil roller (not shown) having a flat surface. Is performed to form the absorber point-like compressed portion ED10.

As shown in FIG. 5A, the portion where the absorbent point squeezed portion ED10 is formed is recessed from each of the skin side and the non-skin side, and is located at a substantially central portion in the thickness direction of the absorbent body 10. Moreover, the thickness of the absorber 10 of the absorber dotted compression part ED10 becomes smaller than the thickness t10 by the pressing process, and the fiber is crushed and the fiber density is higher than the portion having the thickness of t10.

Subsequently, the recess 15 is formed. The recessed part 15 is formed by adding a pressing process to the center area | region in the width direction of the absorber 10 (FIG. 5B). Specifically, it is formed using a pair of roll portions 50 having an upper roll 51u and a lower roll 51d that are driven and rotated along the transport direction.

FIG. 6 is a schematic enlarged view of a pair of roll portions 50. The absorbent body 10 is transported with its longitudinal direction facing the transport direction, and when the direction orthogonal to the transport direction is defined as the “CD direction”, the width direction of the absorbent body 10 is basically directed to the CD direction. Yes.

The upper roll 51u is provided with a rib portion 51r protruding annularly continuously over the entire circumference in the rotation direction, and the cross-sectional shape orthogonal to the rotation direction of the rib portion 51r is the rotation radius of the upper roll 51u. The rib width becomes narrower toward the outside in the direction, and the tip has a substantially isosceles trapezoidal shape with a top surface 51rt parallel to the CD direction. Of the formed recess 15, at least a part of the portion with which the top surface 51 rt comes into contact is the deepest portion 15 m described later. The length of the top surface 51rt in the CD direction (width direction) is preferably 0.5 mm to 3.0 mm, and is 1.0 mm in this embodiment. Further, in the lower roll 51d, a groove 51m into which the rib 51r can be inserted is provided on the outer peripheral surface at a position facing the rib 51r continuously in an annular shape over the entire circumference in the rotational direction. The shape of the cross section orthogonal to the rotation direction of the groove 51m also has a substantially isosceles trapezoidal shape having a bottom surface 51mb parallel to the CD direction, with the groove width becoming narrower toward the inside in the rotation radius direction of the lower roll 51d.

The concave portion 15 is formed by pressing the rib portion 51r into the groove portion 51m and performing a pressing process so that the thickness of the absorber 10 at the portion where the top surface 51rt is in contact is the smallest. Specifically, absorption is performed in a state where the non-skin side surface 10b of the absorber 10 is the upper roll 51u and the skin side surface 10t of the absorber 10 is the lower roll 51d side along the conveyance direction between the upper and

lower rolls

51u and 51d. As shown in FIG. 6, the rib portion 51 r is pushed into the groove portion 51 m to the portion located on the skin side from the skin side surface 10 t of the absorbent body 10 before processing. Also, the portion P ₀ of the absorbent body 10 which abuts on the boundary portion between the outer peripheral surface and the groove 51m of the lower roll 51d, skin side recess P will be described later, it is formed.

At this time, the fiber density of the portion of the recess 15 where the absorber 10 is the thinnest in contact with the top surface 51rt is increased. The concave portion 15 is formed by pushing the rib portion 51r into the groove portion 51m, unlike the point-like compressed portions ED10 and ED20 formed by using an anvil roll, and is thus more compacted than the point-like compressed portions ED10 and ED20. Has been processed.

Subsequently, as shown in FIG. 5C, the top sheet 20 previously coated with the adhesive HMA is laminated and fixed from the skin side of the absorbent body 10.

After laminating the top sheet 20, the main body squeezed portion ED20 is formed. The top sheet 20 and the absorbent body 10 are squeezed together in the thickness direction from above the top sheet 20 to form a main body point-like compressed portion ED. The main body point squeezed portion ED20 is formed in a roll gap between a convex roller (not shown) having a plurality of protrusions and an anvil roller (not shown) having a flat surface, similarly to the absorber point squeezed portion ED10. It forms by performing the pressing process from the skin side through the absorber 10 which mounted the top sheet 20 (FIG. 5D).

After forming the main body squeezed portion ED20, the linear squeezed portion EL is formed. The linear squeezing portion EL is formed in a roll gap between a convex roller (not shown) having a plurality of protrusions having an arrangement pattern corresponding to the linear squeezing portion EL and an anvil roller (not shown) having a flat surface. The linear pressing part EL is formed by performing the pressing process from the skin side through the absorbent body 10.

Thereafter, the back sheet 30 is laminated and fixed from the non-skin side of the absorbent body 10. At this time, adhesive HMA is applied in a predetermined application pattern on substantially the entire surface of the backsheet 30 in advance, and the backsheet 30 is laminated by applying a certain pressure from the non-skin surface side of the absorbent body 10.

In addition, in this embodiment, it formed in order of formation of absorber point squeezing part ED10, formation of crevice 15, lamination of top sheet 20, formation of main part point squeezing part ED20, formation of linear pressing part EL. However, it is not limited to this. First, the recessed part 15 may be formed and the absorber dotted | punctate pressing part ED10 may be formed. Alternatively, the recess 15 may be formed after the top sheet 20 is laminated on the absorbent body 10.

<When using the napkin 1>
Hereinafter, the aspect at the time of use of the napkin 1 is demonstrated. FIG. 7 is a diagram illustrating a usage mode of the napkin 1. When the wearer wears the napkin 1, first, the napkin 1 in a flat state is fixed to the crotch part (crotch portion) of the underwear as represented by the state A in FIG. At this time, when the length of the absorbent body 10 in the width direction is 70 mm, the wing portion 30w (20w) is bent to the non-skin side, and the wing adhesive portion 40w is affixed to the outside of the crotch portion of the underwear to fix the napkin 1 The length in the width direction of the napkin 1 is approximately the same as the length in the width direction of the absorbent body 10. Generally, since the wearer's crotch width is about 30 mm, the length in the width direction of the napkin 1 (absorber 10) in this state A is longer. Usually, as the length in the width direction of the absorbent body 10 is longer, more excrement can be absorbed. However, if the length in the width direction of the absorbent body 10 is too long, the width of the inseam of the wearer Since it becomes large, the wearer may feel uncomfortable or may be bent at an unexpected part, and excrement may leak. Therefore, as described later, it is appropriate that the length of the absorbent body 10 is about 70 mm in consideration of deformation according to the wearer's body.

Subsequently, the underwear is moved up to the wearer's crotch 201K. At this time, as shown in the state B of FIG. 7, the napkin 1 is bent so as to protrude toward the skin side along the concave portion 15 of the absorbent body 10. In the state where the napkin 1 is worn in the wearer's crotch 201K, as shown in the state C of FIG. 7, the portion that is guided to the concave portion 15 and protrudes to the skin side (skin side portion H in FIG. 8A and the like) It becomes easy to come into contact with the gap where the excretion opening 201He such as the vaginal opening is present. Thereby, while making it easy to make a wearer feel good fitting property, excretion fluids, such as menstrual blood, can be made easy to absorb into absorber 10 without leaking. Moreover, since it deform | transforms according to a wearer's body shape, the absorber 10 (napkin 1) which has a width | variety longer than a wearer's crotch width becomes a size suitable for a wearer's body, and absorbs excretion. While securing, the napkin 1 can be fitted to the wearer's body.

<About the structure and effect | action of the recessed part 15>
First, the recess 15 in the crotch region will be described. FIG. 8A is a schematic cross-sectional view of the recess 15 in FIG. 5D. FIG. 9A is a diagram illustrating the recess 15 of the napkin 1 before use, and FIG. 9B is a diagram illustrating the recess 15 of the napkin 1 in a worn state. The length and depth of each part in the following description can be measured by a known method. For example, it can measure using the image which image | photographed the cross section which cut the napkin 1 in the width direction.

The concave portion 15 is a groove formed by pressing, and in the state of the napkin 1 before use, the other side of the non-skin side surface 10b of the absorbent body 10 starts to bend toward the skin side on one side in the width direction. To the part that has been curved toward the skin side. The length 15w in the width direction of the recess 15 is preferably 1.5 mm to 3.5 mm. In the present embodiment, the length 15w is about 2.4 mm. The longer this 15w is, the easier it is for the absorber 10 to bend, but since the recess 15 is formed by pressing, the fibers may be crushed and hardened. As the length 15w is increased, excrement etc. The capacity to hold the liquid is reduced. For this reason, the length 15w in the width direction of the recess 15 is set to 2.0 mm to 3 mm in consideration of the ease of bending so as to protrude toward the skin and the securing of the liquid absorption region of the absorbent body 10 that absorbs excreta. 0.0 mm is preferable.

The part of the absorbent body 10 that is adjacent to the concave part 15 from the skin side in the thickness direction is referred to as a skin side part H, and is a part that overlaps the concave part 15 in the width direction (a dark sandy pattern region in FIG. 8A). Moreover, the site | part which adjoins the skin side site | part H from the outer side in the width direction is called the outer site | part L, and is a part which has the thickness t10 of the absorber 10 in which each point-like pressing part ED10, 20 and the recessed part 15 are not formed, The skin side surface 10t and the non-skin side surface 10b of the outer part L are substantially the same positions as the skin side surface 10t and the non-skin side surface 10b of the absorbent body 10 before processing. In the present embodiment, the thickness t10 is about 1.3 mm.

At this time, the fiber density of the skin part H is higher than the fiber density of the outer part L. Generally, it is known that the higher the fiber density, the faster the liquid is absorbed by capillary action. Therefore, in the wearing state (state C in FIG. 7), when bent so as to protrude to the skin side, the excrement can be absorbed more quickly due to the high fiber density of the skin side portion H that contacts the excretion opening. . Of the skin side portion H, a region adjacent to the deepest portion 15m that is the deepest portion of the recess 15 from the skin side and overlapping the deepest portion 15m in the width direction is referred to as a high density region DH. Since the deepest portion 15m has a predetermined length (for example, about 0.8 mm) in the width direction (W in FIG. 8A), the high-density region DH includes not only the longitudinal direction but also a planar region along the width direction. Have.

The center Hc in the thickness direction of the high-density region DH is located on the skin side with respect to the center Lc in the thickness direction of the absorbent body 10 at a position overlapping the outer portion L in the width direction. In the present embodiment, the center Lc is substantially the same position as the center yy in the thickness direction of the absorbent body 10 before processing. Thereby, even when force is applied in the width direction by the wearer's crotch (leg) at the time of wearing, it can be induced to bend so as to protrude to the skin side rather than the deformation protruding to the non-skin side. The excrement can be absorbed at a position closer to the excretion opening of the wearer.

The depth of the deepest portion 15m in the crotch region, that is, the distance L2 in the thickness direction from the non-skin side surface 10b (absorbent body 10 before processing) of the outer portion L of the crotch region to the deepest portion 15m is from the deepest portion 15m to the skin. It is longer than the distance L1 in the thickness direction to the skin side surface 10t of the side portion H (high density region DH) (L2> L1). In the present embodiment, the depth L2 of the deepest portion 15m is about 0.8 mm, and the distance L1 in the thickness direction from the deepest portion 15m to the skin side surface 10t of the skin side portion H is about 0.5 mm. The fiber density of the high density region DH is increased.

The recess 15 of the napkin 1 is formed over the entire length in the longitudinal direction. FIG. 10A is a schematic cross-sectional view of the recess 15 in the crotch region. FIG. 10B is a schematic cross-sectional view of the recess 15 at the rear side. 10A is an enlarged cross-sectional view of the portion indicated by the arrow AA in FIG. 1, and the concave portion 15 in FIG. 10B is an enlarged cross-section of the portion indicated by the arrow DD in FIG. FIG. The portion indicated by the arrow DD in FIG. 1 shows the recess 15 at the rear end in the longitudinal direction of the napkin 1. Although the recessed part 15 has the high-density area | region DH over the full length of a longitudinal direction, the high-density area | region DH is abbreviate | omitted for convenience in FIG. 10A and FIG. 10B. Hereinafter, the concave portion 15 at the rear end portion will be described as the concave portion 15 at the one end portion in the longitudinal direction of the napkin 1, but the same applies to the concave portion 15 at the front end portion as the other end portion in the longitudinal direction. . Further, the recess 15 at the rear end of the napkin 1 is the recess 15 at the rear end of the absorbent body 10.

The concave portion 15 includes an upper roll 51u having a rib portion 51r continuously protruding over the entire circumference in the rotation direction, and a lower roll 51d having a groove portion 51m provided in an annular shape continuously over the entire circumference in the rotation direction. In between, it forms by pressing through the absorber 10 before a process. At this time, the center part in the longitudinal direction including the crotch part of the absorbent body 10 has a larger thickness of the absorbent body 10 than the rear side part including the rear end part (t10> tb10). Is squeezed more strongly than the skin side portion H at the rear end portion, and the fiber density of the skin side portion H at the crotch portion is higher than the fiber density at the rear end portion. Similarly, the fiber density of the high-density region DH at the crotch region is higher than the fiber density of the high-density region DH at the rear end.

The fiber density of the skin side part H in the crotch part and the skin side part H at the end on the back side is not necessarily constant. The napkin 1 has the highest fiber density in the high density region DH in each skin side portion H, and the fiber density in the portion adjacent to the outer portion L is low. Moreover, even if it respond | corresponds to the contact degree with each

roll

51u and 51d at the time of formation of the recessed part 15, the fiber density in the skin side site | part H may differ partially. Therefore, when the fiber density of the skin side part H is not constant, the “fiber density of the skin side part H” means the average fiber density in the entire skin side part H. And the average fiber density in the whole skin side site | part H of a crotch part is compared with the average fiber density in the whole skin side site | part H of the edge part of a rear side. Specifically, it can measure and compare by a well-known method similarly to the above-mentioned method. For example, each skin side part H (range of 15 w in the width direction) of the crotch part and the rear end is cut out from the napkin 1 as a sample having a predetermined length (10 mm) in the longitudinal direction. The mass was measured with a direct balance (for example, an electronic balance HF-300 manufactured by Kensei Kogyo Co., Ltd.), and the area of each skin side portion H was calculated using an image of a cross-section obtained by cutting the napkin 1 in the width direction. By dividing the mass of each sample by the product of the area of each skin side site H and the predetermined length (10 mm) cut out as a sample, the fiber density of each skin side site H can be calculated and compared. it can.

In addition, about the comparison of the fiber density of each skin side site | part H, it is only necessary to specify a magnitude relationship, and it is not necessary to calculate each mass, each area, etc. For example, in the napkin 1, the density of the absorbent body 10 before forming the recess 15 (before processing) is substantially uniform, and the mass of the fiber per unit area of the crotch is the fiber per unit area of the rear side part. Is about 1.4 times the mass of Therefore, when each sample at the crotch region and the rear end is cut out from the napkin 1 in the same manner as described above, the mass of the sample at the crotch region is about 1.4 times the mass of the sample at the rear end. . In this case, in the image of the cross section of each sample, the area of the sample at the crotch region and the area of the sample at the rear end are visually compared. If it is clearly smaller than 1.4 times the area of the part sample, it can be obtained that the fiber density of the sample at the crotch region is higher than the fiber density of the sample at the rear end.

The higher the fiber density of the skin side part H of the absorbent body 10, the higher the rigidity of the skin side part H, and the easier it is to deform the absorbent body 10 with the recess 15 as a starting point. In the napkin 1, when the fiber density of the skin side part H in the crotch part located in the crotch part of the wearer is increased, force is applied in the width direction by the wearer's crotch (leg) at the time of wearing. Furthermore, it becomes easy to bend the absorbent body 10 so as to protrude from the concave portion 15 in the crotch region to the skin side. On the other hand, since the rear side portion is less required to be deformed to be raised toward the skin side as the crotch portion is worn, the fiber density of the skin side portion H at the rear end portion is set to the skin side portion H of the crotch portion. By making it lower than the fiber density, the rear side portion can gently deform the absorbent body 10 along the shape of the wearer's buttocks when worn. In this manner, the napkin 1 can be deformed according to the shape of the wearer's body when worn, and the wearer can be absorbed faster by fitting the absorber 10 to the wearer's excretion opening. However, it is possible to further reduce the uncomfortable feeling when wearing the napkin 1.

Further, the fiber density of the skin side part H in the crotch part is higher than the fiber density of the skin side part H at the front and rear end portions, so that the absorbed excrement is absorbed by the capillary action. It becomes easier to stay at the skin side part H in the crotch part than the skin side part H at the end. In the napkin 1, the excrement tends to stay at the skin side portion H in the central portion in the longitudinal direction. For this reason, excrement is difficult to be diffused to the skin side portion H of the front side part and the rear side part in the longitudinal direction, and it is easy to provide a region where no excrement adheres to the front side part and the rear side part of the napkin 1. Therefore, when a wearer disposes the napkin 1 after use, a possibility that a wearer may soil his hand with excrement can be reduced.

In addition, the formation method of the recessed part 15 is the rib part 51r which protruded continuously over the perimeter of a rotation direction to the absorber 10 before a process which has the area | region where the mass of the fiber per unit area differs as mentioned above. It is not restricted to the method of squeezing with the upper roll 51u which has this, and the lower roll 51d which has the groove part 51m provided cyclically | annularly over the perimeter of the rotation direction. For example, on the absorbent body 10 before processing, in which the mass of fibers per unit area is substantially constant, an upper roll provided with rib portions having different projecting heights in the rotation direction, and a groove portion continuous over the entire circumference in the rotation direction. It can change suitably, such as giving a pressing process using a pair of roll part which has.

Further, the recess 15 of the napkin 1 is formed not only between the crotch part of the absorbent body 10 but also over the entire length in the longitudinal direction, and the front side part located on the wearer's abdomen and the rear side part located on the buttocks when worn. Since the recess 15 is also provided in the crotch region, the front end and the rear end of the recess 15 are adapted to follow the wearer's body while being deformed to project to the skin side by the recess 15. The shape can be changed gently.

Further, the cross-sectional shape of the recess 15 along the width direction in the crotch region (FIG. 10A) is different from the cross-sectional shape of the recess 15 along the width direction at the rear end (FIG. 10B). Specifically, the length 15w in the width direction of the concave portion 15 in the crotch region and the concave portion 15 in the rear end portion are substantially the same, and the length W in the width direction of any deepest portion 15m is also substantially the same length. It is. However, the depth (L2) of the deepest portion 15m of the concave portion 15 at the crotch region is deeper than the depth (L5) of the deepest portion 15m of the concave portion 15 at the rear end portion (L2> L5). The depth of the deepest portion 15m of the concave portion 15 at the rear end is a distance L5 in the thickness direction from the non-skin side surface 10b of the outer portion L of the rear end to the deepest portion 15m. This is because the mass of the fibers per unit area of the absorbent body 10 is different from the method of forming the recesses 15 as in the fiber density described above.

As described above, the cross-sectional shape of the recess 15 along the width direction at the crotch region and the cross-sectional shape of the recess 15 along the width direction at the rear end portion are different, so that the absorbent body 10 at the crotch region can be worn. And the change in the shape of the absorbent body 10 at the rear end can be made different. In particular, as in the case of the napkin 1, the depth (L2) of the deepest portion 15m of the concave portion 15 at the crotch region is deeper than the depth (L5) of the deepest portion 15m of the concave portion 15 at the rear end. The concave portion 15 of the part becomes a deeper groove, and can be formed in a mountain shape that protrudes firmly to the skin side when worn. On the other hand, since the recess 15 at the rear end is not required to have a mountain shape as much as the crotch region, a recess 15 having a shallower groove than the crotch region is formed so that it can be easily along the wearer's buttocks. ing.

Furthermore, although the pair of skin side recessed part P is provided in the center part of the longitudinal direction of the absorber 10 on the both outer sides of the width direction of the high-density area | region DH (FIG. 10A etc.), it is in a front side part and a rear side part. Does not have a pair of skin-side recesses P (FIG. 10B). Each skin side recessed part P is provided in the skin side surface of the absorber 10 along the longitudinal direction.

FIG. 8B is an enlarged view of a portion Z in FIG. 8A. FIG. 8B shows a state where the virtual straight line V is brought close to the cross section of the napkin 1 (absorber 10) along the width direction so that the virtual straight line V and the absorber 10 are in contact with each other at two points. The skin-side concave portion P is a groove formed by pressing, and in the state of the napkin 1 before use, one of the two points on the skin side surface 10t of the absorbent body 10 where the virtual straight line and the absorbent body 10 are in contact with each other. Is the indentation start point, and the other is the indentation end point. The length in the width direction of each skin-side concave portion P is shorter than the length 15 w in the width direction of the concave portion 15. Specifically, the length Wp is preferably 0.3 mm to 1.2 mm. In the present embodiment, the length Wp is about 0.8 mm. Accordingly, the absorbent body 10 is guided to bend toward the skin side by the concave portion 15 having a longer length in the width direction, and is guided to be bent toward the non-skin side by the skin side concave portion P having a shorter length in the width direction. can do.

The depth of the skin side recessed part P says the distance L3 of the virtual straight line V and the skin side deepest part Pm (FIG. 8B). At this time, the depth (L3) of the skin-side concave portion P is the deepest portion from the depth of the deepest portion 15m of the concave portion 15, that is, the non-skin side surface 10b (absorbent body 10 before processing) of the skin side surface 10b of the outer portion L. It is smaller than the distance L2 in the thickness direction up to 15 m (L3 <L2). Specifically, in the present embodiment, the depth (L3) of the skin-side deepest portion Pm is about 0.2 mm, and the depth (L2) of the deepest portion 15m is about 0.8 mm. In addition, although the depth of the skin side recessed part P is the distance L3 of the skin side deepest part Pm and the virtual straight line V, as shown to FIG. 8B etc., the top sheet 20 and the skin side deepest part Pm have adhere | attached. When there is not, the depth of the skin side deepest part Pm is substantially equal to the distance of the top sheet 20 and the skin side deepest part Pm.

Since the crotch region has a pair of skin-side recesses P, when the absorbent body 10 is bent so that the skin-side region H protrudes to the skin side in the wearing state (state C in FIG. 7), the skin-side region H The region between the skin-side recesses P of each becomes a portion that comes into contact with the wearer's skin (FIG. 9B), and wears the high-density region DH that is closer to a flat surface than when the skin-side recess P is not provided. Can be brought into contact with the skin of the person and the skin contact can be improved. In addition, in a front side part and a rear side part, since there is little need to make the flat part of the recessed part 15 raised on the wearer's skin contact | abut to a wearer's skin, a pair of skin side recessed part P is made into the back side (front side). It is not necessary to provide at one end part of.

Furthermore, as shown in FIG. 1, since the linear pressing part EL which crosses the recessed part 15 in the width direction is not provided in the crotch part, the recessed part 15 along a longitudinal direction raises the absorber 10 to the skin side. The risk of hindering the bending deformation by the linear squeezing portion EL that traverses in the width direction is reduced, and the skin is easily raised at the crotch region. In the napkin 1, the linear pressing part EL is a part that has been pressed more strongly than the concave part 15. When the linear pressing part EL is provided so as to cross the concave part 15 in the width direction, the absorbent body by the concave part 15. There is a possibility that the deformation of the absorbent body 10 (napkin 1) by the linear squeezing part EL will appear stronger than the deformation of 10. That is, when the linear pressing part EL is provided so as to cross the recess 15 in the width direction, there is a possibility that the mountain fold shape along the width direction is formed along the recess 15 instead of the mountain fold shape. Therefore, in the crotch region, in order to make the absorbent body 10 easily protrude to the skin side by the concave portion, the linear pressing portion EL that crosses the concave portion 15 in the width direction is not provided and is absorbed by the wearer's excretion opening. The body 10 was made easy to fit.

On the other hand, on the front side of the napkin 1, a linear squeezed portion ELf that crosses the front side of the recess 15 in the width direction is provided, and on the rear side of the napkin 1, a linear squeezed portion ELb that crosses the recess 15 in the width direction. Is provided. About the front side and the rear side of the napkin 1, it is not necessary to make it rise to the skin side as the crotch part, and it may be preferable to set it as the shape along the shape of a wearer's abdomen and buttocks rather than projecting to the skin side. Therefore, on the front side and the rear side of the napkin 1, by providing the linear pressing portions ELf and ELb that cross the concave portion 15 in the width direction, it is possible to easily conform to the shape of the body.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof. For example, the following modifications are possible.

In the above-described embodiment, the recess 15 is formed over the entire length of the absorbent body 10 in the longitudinal direction, but the present invention is not limited to this. At least the crotch region corresponding to the wearer's crotch at the time of wearing and the concave portion 15 at one end (for example, the rear end) or the other end (for example, the front end) of the napkin 1 in the longitudinal direction. May be provided. By providing the crotch region and the recess 15 in either one of the one end or the other end, the crotch in the central region in the width direction of the napkin 1 can be easily protruded to the skin side, and the wearer's buttocks or abdomen The absorber 10 can be deformed so as to follow the shape. However, like the napkin 1, the recess 15 is formed in the crotch part and both ends in the longitudinal direction, and the absorbent body 10 is formed over the entire length of the absorbent body 10, so that the absorbent body 10 is worn from the stomach side to the buttocks. Since it can be made to follow the shape of the body, it can be made to fit with a wearer's body.

In the above-described embodiment, as shown in FIG. 6, the rib portion 51r of the upper roll 51u is pushed into the groove portion 51m of the lower roll 51d so that the top surface 51rt contacts and the absorber 10 has the smallest thickness. However, it is not limited to this. FIG. 11 is a modification of the pair of roll portions 50. As shown in FIG. 11, the clearance between the rib portion 51r of the upper roll 51u and the groove portion 51m of the lower roll 51d is changed so that the slope of the rib portion 51r and the slope of the groove portion 51m are not the part where the top surface 51rt abuts. You may make the thickness of the absorber 10 of the pinched | interposed area | region thinnest. Thereby, since the possibility that the part which contact | abuts a wearer's skin at the time of wear may be strongly squeezed and hardened can be reduced, the touch can be improved.

In the above-described embodiment, the skin side portion H protrudes toward the skin side, but is not limited thereto. In the state before wearing, the skin side surface 10t of the skin side portion H may be recessed toward the non-skin side than the skin side surface 10t of the outer side portion L. Even in this case, the absorbent body 10 can be protruded to the skin side in the recess 15 to fit the excretion opening of the wearer.

Moreover, in the above-mentioned embodiment, although the pair of skin side recessed part P was provided in the center part of the longitudinal direction of the absorber 10 in the both outer sides of the width direction of the high-density area | region DH, it is not necessarily restricted to this. Absent. Even if it does not have a pair of skin side recessed part P, if the fiber density of the skin side part H in a crotch part is higher than the fiber density of the skin side part H in the one end part of a longitudinal direction, the absorber 10 in a crotch part While ensuring the fit, deformation according to the shape of the wearer's abdomen or buttocks is possible.

1 sanitary napkin (napkin), 10 absorbent body, 10t skin side surface, 10b non-skin side surface, 11 absorbent core, 12 upper sheet, 13 lower sheet, 15 recess, 15m deepest part, 20 top sheet (skin side sheet) 20e outer peripheral edge, 20w wing, 30 back sheet (non-skin side sheet), 30e outer peripheral edge, 30w wing, 40c main body adhesive, 40w wing adhesive, 50 pair of rolls, 51u upper roll, 51d Lower roll, 51r rib part, 51m groove part, 51rt top face, 51mb bottom face, 201K crotch, 201He excretion opening, DH high density area, ED10 absorber point squeeze part, ED20 body point squeeze part, EL linear squeeze part ( Pressing part), H skin side part, L outer part, HMA adhesive, P skin side recess, P Skin side the deepest part

Claims

It has a longitudinal direction, a width direction, and a thickness direction orthogonal to each other,
An absorbent article having an absorbent body with liquid absorbent fibers,
The absorber has a concave portion along the longitudinal direction in a central region including a central position in the width direction,
The fiber density of the skin side portion adjacent to the concave portion from the skin side in the thickness direction is higher than the fiber density of the outer portion adjacent to the concave portion from the outside in the width direction,
The absorbent article characterized in that the fiber density of the skin side part in the crotch part located in the crotch part when worn is higher than the fiber density of the skin side part in the one end part in the longitudinal direction.
The absorbent article according to claim 1,
The center of the absorber in the thickness direction at the position overlapping the deepest deepest part of the recess in the crotch region in the width direction,
The absorbent article, which is located on the skin side from the center in the thickness direction of the absorbent body at a position overlapping the outer portion in the width direction.
In the absorptive article according to claim 1 or 2,
The said recessed part is provided from the one end of the said longitudinal direction of the said absorber to the other end, The absorbent article characterized by the above-mentioned.
In the absorptive article according to any one of claims 1 to 3,
The mass of the liquid absorbent fiber per unit area of the skin side part in the crotch part,
The absorbent article characterized by being larger than the mass of the liquid absorbent fiber per unit area of the skin side part in the one end.
In the absorptive article according to any one of claims 1 to 4,
An absorbent article, wherein a cross-sectional shape of the concave portion along the width direction in the crotch region is different from a cross-sectional shape of the concave portion along the width direction at the one end portion.
In the absorptive article according to any one of claims 1 to 5,
The deepest deepest part of the said crevice in the said crotch part is deeper than the deepest deepest part of the said crevice in the said one end part, The absorbent article characterized by the above-mentioned.
In the absorptive article according to any one of claims 1 to 6,
In the crotch region,
On the skin surface side of the absorber, a pair of skin side recesses along the longitudinal direction are provided,
In the width direction, the pair of skin-side recesses are shallower than the deepest deepest part of the recesses and are provided on both outer sides of the deepest part,
The absorbent article, wherein the skin-side recess is not provided at the one end.
In the absorptive article according to any one of claims 1 to 7,
In the crotch part, the pressing part which crosses the said recessed part in the said width direction is not provided, The absorbent article characterized by the above-mentioned.