JP2018102825A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which can fit to an excreting part of a wearer.SOLUTION: An absorbent article (1) comprising a longitudinal direction, a width direction and a thickness direction which are orthogonal each other, and comprises: an absorber (10) having liquid absorbent fibers; and a non-skin side sheet (30) arranged closer to a non-skin side than the absorber in the thickness direction. The absorber (10) comprises a recess (15) along a longitudinal direction on a crotch portion provided on at least a crotch part in wearing time, on a center area in a width direction of a non-skin side surface, and a fiber density of a skin side portion (H) adjacent to the recess (15) from a skin side in the thickness direction is higher than a fiber density of an outside portion (L) adjacent to the recess (15) in the width direction from outside. A deepest part (15m) where is deepest on the recess (15) on the crotch part and the non-skin side sheet (30) are separated, a depth (L2) of the deepest part (15m) is larger than a thickness (L1) from the deepest part (15m) to a skin side surface (10t) of the absorber (10).SELECTED DRAWING: Figure 8

Description

  The present invention relates to an absorbent article.

  A sanitary napkin is known as an absorbent article that absorbs excreted fluid such as menstrual blood. As an example of such a sanitary napkin, Patent Document 1 describes a sanitary napkin 1 having a liquid absorbing layer 4 between a liquid-permeable top sheet 3 and a liquid-impermeable back sheet 2. In addition, it is disclosed that when the sanitary napkin 1 is attached, the rear center region 20D is deformed into a convex shape and is easily adhered to the wearer's buttocks.

JP 2004-181085 A

  However, normally, absorbent articles such as sanitary napkins are intended to absorb excretions excreted from the user's vaginal opening (perineal area), and adhere closely to the wearer's buttocks like sanitary napkins 1. Only by letting it pass, the sanitary napkin 1 cannot be fitted to the excretion opening such as the vaginal opening of the user's body, and the excretion liquid spreads on the surface of the absorbent article, which is inconvenient for the user. There was a risk of causing pleasure.

  This invention is made | formed in view of the above problems, Comprising: It is providing the absorbent article which can be made to fit a wearer's excretion opening | mouth.

The main invention for achieving the above object is:
An absorbent body having a longitudinal direction, a width direction, and a thickness direction orthogonal to each other, and having liquid absorbent fibers, and a non-skin side sheet disposed on the non-skin side of the absorbent body in the thickness direction. The absorbent article has a concave portion along the longitudinal direction at a crotch portion located at least in the crotch portion when worn in the central region in the width direction of the non-skin side surface. And the fiber density of the skin side part adjacent to the concave part from the skin side in the thickness direction is higher than the fiber density of the outer part adjacent to the concave part from the outside in the width direction, and the fiber density of the concave part in the crotch part The deepest deepest part is separated from the non-skin side sheet, and the depth of the deepest part is greater than the thickness from the deepest part to the skin side surface of the absorbent body. is there.
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, by providing a concave portion at least in the crotch region, it is possible to make it easier to be deformed so as to protrude to the skin side by the concave portion at the time of wearing than when a guide portion is provided only in the buttock. Can be fitted to the part corresponding to the excretion opening. As a result, it is possible to reduce the spread of excrement and absorb the excretion more quickly. In addition, since the depth of the deepest part is larger than the thickness from the deepest part to the skin side of the absorbent body, and the deepest part and the non-skin side sheet are separated from each other, deformation that rises to the skin side is prevented by the non-skin side sheet. It is easier to deform and bulge to the skin side.

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 an absorbent body point squeezed portion ED10 is formed on the absorbent body 10 before processing in the portion indicated by arrows 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. 8 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. 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 portion. 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 body having a longitudinal direction, a width direction, and a thickness direction orthogonal to each other, and having liquid absorbent fibers, and a non-skin side sheet disposed on the non-skin side of the absorbent body in the thickness direction. The absorbent article has a concave portion along the longitudinal direction at a crotch portion located at least in the crotch portion when worn in the central region in the width direction of the non-skin side surface. And the fiber density of the skin side part adjacent to the concave part from the skin side in the thickness direction is higher than the fiber density of the outer part adjacent to the concave part from the outside in the width direction, and the fiber density of the concave part in the crotch part The deepest deepest part is separated from the non-skin side sheet, and the depth of the deepest part is greater than the thickness from the deepest part to the skin side surface of the absorbent body. is there.

  According to such an absorbent article, by providing a recess at least in the crotch region, it is easier to deform so as to protrude to the skin side by the recess when worn than when a guide portion is provided only at the buttocks. The absorber can be fitted to the part corresponding to the excretion opening. As a result, it is possible to reduce the spread of excrement and absorb the excretion more quickly. In addition, since the depth of the deepest part is larger than the thickness from the deepest part to the skin side of the absorbent body, and the deepest part and the non-skin side sheet are separated from each other, deformation that rises to the skin side is prevented by the non-skin side sheet. It is easier to deform and bulge to the skin side.

  In such an absorbent article, it is desirable that the absorbent body and the non-skin side sheet are bonded with an adhesive, and the adhesive is not attached to the deepest portion.

  According to such an absorbent article, since the non-skin side sheet | seat is not adhere | attached in the deepest part, the possibility that it may be prevented from protruding to the skin side surface by a non-skin side sheet | seat can be reduced.

  In such an absorbent article, the end of the recess in the width direction and the non-skin side sheet are bonded, and the non-skin side sheet is positioned on the inner side in the width direction than the end of the recess. It is desirable that the adhesive is attached to the portion.

  According to such an absorbent article, the concave portion before using the absorbent article is not adhered to the non-skin side sheet from the inner side of the end portion in the width direction. Accordingly, the absorbent main body bulges to the skin side and the non-skin side sheet similarly bulges to the skin side, so that the area of the concave portion in contact with the non-skin side sheet increases. With the adhesive applied to the non-skin side sheet, the inner part of the non-skin side sheet from the end of the concave part is newly bonded to the concave part, so it is easy to maintain the shape of the absorbent article raised on the skin side. Become.

  In such an absorbent article, the center in the thickness direction of the absorber at a position overlapping the deepest portion in the width direction is the center in the thickness direction of the absorber at a position overlapping with the outer portion in the width direction. More preferably, it is located on the skin side.

  According to such an absorbent article, when it wears, it becomes easy to bend so that it may protrude to the skin side, it becomes easy to fit in an excretion opening, and it becomes easy to absorb excretion faster.

  In such an absorbent article, it is desirable that the skin side portion protrudes toward the skin side.

  According to such an absorbent article, since a wearer can know that the recessed part is formed before the time of use, he can recognize that it fits at the time of wear. Moreover, since the position of the center area | region in which the recessed part was formed before use can be recognized, it becomes easy to match the center position of an absorbent article with the center of underwear.

  In such an absorbent article, the concave portion is provided at least to a rear portion located at the buttocks when worn, and the distance from the deepest portion in the crotch portion to the non-skin side sheet is the deepest portion in the rear portion. It is desirable that the distance is greater than the distance from the non-skin side sheet.

  According to such an absorbent article, the recess 15 in the crotch region is a deep groove, and by deepening the groove, it can be formed into a mountain shape that protrudes firmly to the skin side when worn, It is easy to fit to the excretion opening by deforming to protrude sideward, and the recess 15 in the rear part is less necessary to have a mountain shape as the crotch part at the time of wearing. Can be gently deformed, and can easily follow the shape of the buttocks.

  In such an absorbent article, the absorbent body and the non-skin side sheet are bonded with an adhesive, the end of the recess in the width direction and the non-skin side sheet are bonded, and the non-skin In the state where the non-skin side surface of the side sheet is exposed, it is preferable that the concave portion is visible through the non-skin side sheet.

  According to such an absorbent article, the non-skin side sheet is bonded to the end portion in the width direction of the recess, so that the shape of the non-skin side sheet positioned at the end portion in the width direction of the recess is a recess. It changes to conform to the shape of the surface, and the appearance is different between the region other than the recess, the end in the width direction of the recess, and the region inside the end in the skin direction of the recess, and the presence of the recess even before use Can be recognized, and it can be recognized that the fit is improved.

=== 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 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. 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”). Moreover, the XX line in a figure is a centerline 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 top sheet 20 and the back sheet 30 have the same planar 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 includes 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 planar 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. Moreover, the thickness of the absorber 10 is 3 mm or less, desirably 2 mm or less, and the fiber density of the absorber 10 is 1.0 × 10 ^{5 to} 4.0 × 10 ⁵ (g / m ³ ) and is substantially 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 of the liquid absorbent fiber is 175 (g / m ² ) at the front side, 250 (g / m ² ) at the center, and 175 (g / m) at the rear. m ² ), the amount of liquid absorbent fibers in the center is the largest, and the thickness of the absorber 10 (t10) in the center is greater than the thickness (tb10) of the absorber 10 in the front and rear sides. Large (t10> tb10).

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, for each thickness, dial thickness gauge ID-C1012C manufactured by Mitutoyo Corporation or equivalent is used, 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. Moreover, the mass of the fiber per unit area is cut out from the napkin 1 as a target sample, for example, and the mass of the target sample is measured 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. 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 backsheet 30 suppresses the liquid that has passed through the topsheet 20 and is 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 recessed part 15 is a linear pressing part 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.

  5A to 5D are diagrams illustrating the formation of the point-like compressed parts ED10, ED20, and the recessed part 15. FIG. FIG. 5A is a schematic cross-sectional view in which an absorbent body point squeezed portion ED10 is formed on the absorbent body 10 before processing in the portion indicated by arrows 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. In addition, the absorber 10 in FIG. 5A is the absorber 10 of the part shown by the BB arrow in FIG. 1, Comprising: The absorber before a process before forming the point-like pressing parts ED10, ED20, and the recessed part 15 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 are center lines of the absorber 10 in the thickness direction, and YY in FIG. 5D is a 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 to FIG. 5A, the part in which the absorber dotted | punctate pressing part ED10 was formed is dented from each of the skin side and the non-skin side, and is located in the approximate center part in the thickness direction of the absorber 10. FIG. 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 the 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 the present 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. 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. Processing has been applied.

  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 the formation of the main body point pressing part ED20, the linear pressing part 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, an operation of pulling up the underwear toward the wearer's crotch 201K is performed. 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. 8 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>
FIG. 8 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. FIG. 9B is a partially enlarged view of the recess 15 in the state C in FIG. The length and depth of each part in the following description can be measured by a known method. For example, it can be measured using an image obtained by photographing a cross section of the napkin 1 cut in the width direction.

  In the state of the napkin 1 before use, the recess 15 is a portion of the non-skin side surface 10b of the absorbent body 10 that has started to bend toward the skin side on the other side from the portion that began to bend toward the skin side on the one side in the width direction. Until. 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. Therefore, the width 15w of the recess 15 is set to 2.0 mm to 3 mm in consideration of easiness of bending so as to protrude to the skin side and securing of the liquid absorption region of the absorbent body 10 that absorbs excrement. 0.0 mm is preferable.

  A portion of the absorbent body 10 that is adjacent to the concave portion 15 from the skin side in the thickness direction is referred to as a skin side portion H, and is a portion that overlaps the concave portion 15 in the width direction (a dark sandy pattern region in FIG. 8). 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. 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. Moreover, a pair of skin side recessed part P is provided in the both outer sides of the width direction of the high-density area | region DH. Each skin side recessed part P is provided in the skin side surface of the absorber 10 along the longitudinal direction.

  Since the deepest portion 15m of the napkin 1 has a predetermined length (for example, about 0.8 mm) in the width direction (W in FIG. 8), the high-density region DH is not only in the longitudinal direction but also in the width direction. It has a planar area. When the deepest part 15m has almost no length in the width direction and the deepest part 15m has a mountain shape with the apex being the apex, the pointed absorbent body 10 abuts on the excretion opening of the wearer. May cause discomfort to the person. In this respect, the deepest portion 15m has a predetermined width direction length like the napkin 1, and the high-density region DH has a planar region along the width direction, so that the wearer's excretion port is planarly applied. Since it contacts, a wearer's usability can be improved.

  Further, 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 the 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. By this, even when a force is applied in the width direction by the wearer's crotch (leg) at the time of wearing, it is possible to further induce bending so as to protrude toward the skin side than deformation that protrudes toward the non-skin side. The excrement can be absorbed at a position closer to the excretion opening of the wearer.

  Furthermore, as shown in FIG. 8 etc., the skin side site | part H protrudes to the skin side, and the skin side surface 10t of the high-density area | region DH is located in the skin side rather than the skin side surface 10t of the outer side site | part L. Accordingly, on the skin surface side of the napkin 1, a portion corresponding to the skin side portion H protrudes to the skin side. Thus, since the wearer can recognize the presence of the recess 15 in both appearance and touch before wearing, the wearer can only know that the napkin protrudes toward the skin and easily fits the excretion opening. Instead, the recess 15 provided in the central region in the width direction of the napkin 1 (absorber 10) makes it easier for the wearer to match the center position of the underwear and the center position of the napkin when trying to wear the napkin 1. .

  At this time, the depth L2 of the deepest portion 15m, 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 to the deepest portion 15m is the deepest portion 15m to the skin side portion H. It is longer than the distance L1 in the thickness direction to the skin side surface 10t of (high density region DH) (L2> L1). In the present embodiment, the depth L2 of the deepest portion 15m is 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 0.5 mm. The fiber density in the region DH is increased.

  Moreover, as shown in FIG. 8, the deepest part 15m and the back sheet 30 are separated, and the deepest part 15m and the back sheet 30 are not bonded by the adhesive HMA. Thereby, when the absorbent body 10 is deformed so that the deepest portion 15m of the recess 15 is the starting point and protrudes toward the skin side, the possibility of the deformation being hindered by the rigidity of the back sheet 30 can be reduced.

  Conventionally, it is known that a part located in the buttocks of an absorbent article such as a napkin is deformed into a convex shape to fit the buttocks, but in the case of an absorbent article such as a sanitary napkin, the excretion of the wearer It is desired to fit the mouth of the vagina and the like to absorb the excrement quickly. Moreover, since an absorbent article (absorber) is a soft material, there is a problem that it is difficult to maintain a shape that fits the body.

  In that respect, in the napkin 1, the recess 15 formed in the crotch region causes the absorbent body 10 in the crotch region to bend in the wearing state shown in the state C of FIG. Has improved.

  In order to make the absorbent body 10 bend easily, the napkin 1 firstly has a depth (L2) of the deepest portion 15m from a thickness (L1) from the deepest portion 15m to the skin side surface 10t of the high-density region DH. It is increased (L2> L1). That is, by deeply forming the groove in the deepest portion 15m, the depth (L2) of the deepest portion 15m is smaller than the thickness (L1) from the deepest portion 15m to the skin side surface 10t of the high-density region DH (L2). <L1) When the force from the wearer's crotch (leg) to the inner side in the width direction is applied at the time of wearing as shown in the state C of FIG. It becomes easy.

  Secondly, the deepest part 15m and the back sheet 30 are spaced apart. Usually, since the back sheet 30 has high rigidity and is not processed so as to protrude toward the skin side, the back sheet 30 may interfere with deformation of the absorbent body 10 when worn, but the deepest part By separating 15 m from the back sheet 30, the possibility that the back sheet 30 interferes with the bending deformation of the absorbent body 10 can be reduced.

  Due to the first and second reasons, in the wearing state (state C in FIG. 7), it becomes easy to bend and the fit of the wearer's body is improved.

  The deepest portion 15m and the backsheet 30 are separated from each other, and the adhesive HMA applied to the entire area of the backsheet 30 exists between the deepest portion 15m and the backsheet 30, but the deepest portion 15m The adhesive HMA is not attached. Therefore, the possibility that the backsheet 30 may prevent the absorber 10 from being deformed so as to rise to the skin side can be reduced.

  Further, as described above, when the back sheet 30 is laminated on the absorbent body 10, a pressure force is applied in the thickness direction. Therefore, as shown in FIGS. 8 and 9A, the recess 15 of the napkin 1 before use is used. The end portion 15 e in the width direction is bonded to the back sheet 30. That is, a part of the back sheet 30 is drawn toward the recess 15, the end 15 e of the recess 15 is bonded to the back sheet 30, and the adhesive HMA is present inside the end 15 e in the width direction. However, the deepest portion 15m and the back sheet 30 are not bonded. If this napkin 1 is used, it will bend so that the recessed part 15 may protrude to the skin side, as shown to FIG. 9B (refer the state C of FIG. 7). In this way, when the napkin 1 is bent, not only the absorbent body 10 but also a part of the back sheet 30 is bent together so as to rise to the skin side. Therefore, the area where the back sheet 30 and the absorbent body 10 are in contact with each other increases, and the inner portion 15i inside the end portion 15e that is not bonded to the back sheet 30 is newly bonded to maintain the bent shape during use. Easy to do.

  In the state where the non-skin side surface of the back sheet 30 when using the napkin 1 is exposed, the wearer can visually recognize the recess 15 formed in the absorbent body 10 through the back sheet 30. The back sheet 30 is bonded to the outer portion L and the end portion 15e of the concave portion 15, and the inner side in the width direction is not bonded to the end portion 15e of the concave portion 15. Further, the end 15e is an inclined portion and is different in shape from the outer portion L. Therefore, when the wearer looks at the napkin 1 through the back sheet 30 from the non-skin surface side, the outer portion L, the end 15e of the recess 15 and the inner side in the width direction from the end 15e are different in appearance, and the absorbent body 10 Can be recognized. Thereby, even before the wearer wears the napkin 1, the wearer can recognize that the napkin has the recess 15 formed therein, and can know that the product has improved fit. Note that the recess 15 is not necessarily visible through the back sheet 30. For example, you may use the raw material which cannot visually recognize the shape of the absorber 10, like the colored backsheet 30. FIG.

  Furthermore, since the recessed part 15 of the napkin 1 is formed over not only the crotch part of the absorbent body 10 but also the entire length in the longitudinal direction, the recessed part 15 is also provided in the rear part located on the wearer's buttocks when worn. ing. 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 portion. In addition, the recessed part 15 in FIG. 10A is an expanded sectional view of the part shown by the AA arrow in FIG. 1, and the recessed part 15 in FIG. 10B is an enlarged sectional view of the part shown by the DD arrow in FIG. FIG. 10A and 10B, the high-density region DH is omitted for convenience. Moreover, the thickness t10 of the absorber 10 in FIG. 10A is larger than the thickness tb10 of the absorber 10 in FIG. 10B.

  At this time, as shown in FIG. 10B, the deepest portion 15m of the recess 15 and the back sheet 30 are also separated from each other at the rear portion, and the adhesive HMA is not attached to the deepest portion 15m. Further, the depth (L2) of the deepest portion 15m in the crotch region is larger than the depth (L5) of the deepest portion 15m in the rear portion (L2> L5), and the back seat extends from the deepest portion 15m in the crotch region shown in FIG. 10A. The distance to 30 is longer than the distance from the deepest portion 15m in the rear region shown in FIG. This is because the mass (weight) per unit area of the liquid absorbent fiber of the absorbent body 10 is larger in the central part M including the crotch part than in the rear side part B including the rear part, as described above. The concave portion 15 is derived from the one formed by the roll 51u and the lower roll 51d provided with the rib portion 51r protruding annularly continuously over the entire circumference in the rotation direction.

  The recess 15 in the crotch region is a deep groove, and by making the groove deep, it can be formed into a mountain shape that protrudes firmly to the skin side when worn. On the other hand, the recess 15 in the rear part is a groove shallower than the recess 15 in the crotch part. This is because the recessed portion 15 in the rear portion is less required to have a mountain shape at the crotch portion when worn, and thus the depth of the groove is shallower. From this, in the crotch part, it becomes easy to fit the wearer's excretion opening by the mountain shape protruding to the skin side, and in the rear part, the change in the shape of the absorbent body 10 is made more gradual. It makes it easy to follow the shape of the buttocks, and can reduce the uncomfortable feeling when worn.

  In addition, the distance from the deepest part 15m in the crotch part to the back seat 30 may not necessarily be longer than the distance from the deepest part 15m in the rear region to the back seat 30. For example, when the mass of the fiber per unit area of the absorbent body 10 is substantially constant, the distance from the deepest portion 15m to the back seat 30 may be substantially the same between the crotch region and the rear region.

=== 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-mentioned embodiment, although the recessed part 15 was formed over the full length of the longitudinal direction of the absorber 10, it is not restricted to this. At least during wearing, the crotch part in the crotch region corresponding to the crotch of the wearer is provided with a recess 15 so that the crotch part in the central region in the width direction of the napkin 1 can easily protrude toward the skin side. The absorbent body 10 (napkin 1) can be fitted to the mouth. However, like the napkin 1, the absorbent body 10 can be more easily protruded to the skin side by being formed over the entire length of the absorbent body 10.

  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 deepest portion 15m has been described as a portion having a predetermined length along the width direction, but is not limited thereto. When the concave portion 15 has a mountain shape, the peak of the mountain is the deepest portion 15m. However, since the deepest part 15m has a predetermined length along the width direction, it comes into contact with the skin of the wearer on the surface, so that the skin contact can be improved.

  Furthermore, although the adhesive HMA is not attached to the deepest portion 15m of the recess 15 of the napkin 1 and the deepest portion 15m and the back sheet 30 are not bonded, this is not restrictive. The adhesive HMA may be adhered to the deepest part 15m, or the deepest part 15m and the back sheet 30 may be adhered. Thereby, the possibility of excessively projecting to the skin side can be reduced, and the touch that comes into contact with the excretion opening of the wearer can be adjusted.

  In the above-mentioned embodiment, although the skin side site | part H protruded to the skin side, it is not restricted to this. 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.

DESCRIPTION OF SYMBOLS 1 Sanitary napkin (napkin), 10 absorber, 10t skin side surface, 10b non-skin side surface, 11 absorptive core, 12 upper sheet | seat, 13 lower sheet | seat, 15 recessed part, 15m deepest part, 15e edge part, 15i inner part, 20 top sheet (skin side sheet), 20e outer peripheral edge, 20w wing part, 30 back sheet (non-skin side sheet), 30e outer peripheral edge, 30w wing part, 40c main body adhesive part, 40w wing adhesive part, 50 pair Roll part, 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 region, ED10 absorber point squeeze part, ED20 main body point squeeze Part, EL linear compression part, H skin side part, L outer side part, HMA adhesive

Claims (7)

It has a longitudinal direction, a width direction, and a thickness direction orthogonal to each other,
An absorber having liquid absorbent fibers;
In the thickness direction, a non-skin side sheet disposed on the non-skin side from the absorber, and
An absorbent article having
The absorbent body has a concave portion along the longitudinal direction at a crotch portion located at least in the crotch portion at the time of wearing in the central region in the width direction of the non-skin side surface,
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 deepest deepest part of the recess in the crotch region is spaced from the non-skin side sheet,
The depth of the deepest part is larger than the thickness from the deepest part to the skin side surface of the absorbent body. The absorbent article according to claim 1,
The absorbent body and the non-skin side sheet are bonded with an adhesive,
The absorbent article, wherein the adhesive is not attached to the deepest portion. The absorbent article according to claim 2,
The end in the width direction of the concave portion and the non-skin side sheet are bonded,
The absorbent article, wherein the adhesive is attached to a portion of the non-skin side sheet that is located on the inner side in the width direction from the end of the recess. In the absorptive article according to any one of claims 1 to 3,
The center of the absorber in the thickness direction at the position overlapping the deepest portion in the width direction is
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 with the outer portion in the width direction. In the absorptive article according to any one of claims 1 to 4,
The absorbent article, wherein the skin side portion protrudes toward the skin side. In the absorptive article according to any one of claims 1 to 5,
The concave portion is provided to at least a rear portion located at the buttocks when worn,
The distance from the deepest part in the crotch region to the non-skin side sheet is:
An absorptive article characterized by being larger than the distance from the deepest part in the back part to the non-skin side sheet. In the absorptive article according to any one of claims 1 to 6,
The absorbent body and the non-skin side sheet are bonded with an adhesive,
The end in the width direction of the concave portion and the non-skin side sheet are bonded,
In a state where the non-skin side surface of the non-skin side sheet is exposed,
The said recessed part is visible through the said non-skin side sheet | seat, The absorbent article characterized by the above-mentioned.

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