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CN-115867243-B - Absorbent article

CN115867243BCN 115867243 BCN115867243 BCN 115867243BCN-115867243-B

Abstract

The absorbent article (1) has an upper core (31) and a lower core (32), wherein the upper core (31) has grooves (35) recessed in the thickness direction and having a length in a predetermined direction, the upper core (31) has a groove region in which the grooves (35) are provided and a non-groove region in which the grooves (35) are not provided, at least a part of the groove region is provided in a region where the upper core (31) and the lower core (32) overlap when viewed in the thickness direction, and the average density of the superabsorbent polymer (34) on the skin side of the groove region is lower than the average density of the superabsorbent polymer (34) on the skin side of the non-groove region.

Inventors

  • MUKAI HIROTOMO
  • ONISHI KAZUSHO

Assignees

  • 尤妮佳股份有限公司

Dates

Publication Date
20260508
Application Date
20210928
Priority Date
20200929

Claims (20)

  1. 1. An absorbent article having a longitudinal direction, a width direction and a thickness direction, and having an absorbent core, characterized in that, The absorbent core includes an upper core having a superabsorbent polymer and a lower core disposed on the non-skin side in the thickness direction than the upper core, The upper core has a groove in which a part of the upper core is recessed in the thickness direction, The groove has a length in a predetermined direction, The upper core has a groove region provided with the groove and a non-groove region not provided with the groove when viewed in the thickness direction, At least a part of the groove region is provided in a region where the upper core and the lower core overlap when viewed in the thickness direction, When the upper core is divided into two in the thickness direction, the skin-side portion is defined as a skin-side portion and the non-skin-side portion is defined as a non-skin-side portion, and, at this time, The average density of the superabsorbent polymer on the skin side portion of the grooved region is lower than the average density of the superabsorbent polymer on the skin side portion of the non-grooved region, The absorbent core Has a widthwise central portion and a pair of widthwise side portions divided by dividing the maximum width thereof into three in the widthwise direction, Further, the absorbent article has a front side portion located on the front side in the longitudinal direction with respect to a center line dividing the stretched absorbent article into two parts in the longitudinal direction and a rear side portion located on the rear side in the longitudinal direction with respect to the center line, The rear side portion has a rear side 1 st region as a central region in which the maximum length thereof is divided into three in the longitudinal direction, The front side portion has a front side 1 st region as a central region when the maximum length thereof is divided into three in the longitudinal direction, The value obtained by dividing the area of the groove region of the upper core located at the widthwise central portion of the rear side 1 st region by the area of the widthwise central portion of the rear side 1 st region is smaller than the value obtained by dividing the area of the groove region of the upper core located at the widthwise central portion of the front side 1 st region by the area of the widthwise central portion of the front side 1 st region, The average basis weight of the absorbent core in the widthwise central portion of the rear side 1 st region is higher than the average basis weight of the absorbent core in the pair of widthwise side portions of the rear side 1 st region, The upper core located on the pair of widthwise side portions of the rear side 1 st region includes the groove having a length in the longitudinal direction which is the predetermined direction.
  2. 2. The absorbent article of claim 1, wherein the absorbent article comprises, The upper core located at the widthwise central portion of the rear side 1 st region has a region in which only 1 groove having a length in the longitudinal direction, which is the predetermined direction, is provided.
  3. 3. The absorbent article of claim 1, wherein the absorbent article comprises, The rear portion has a rear 2 nd region at a position on the front side in the longitudinal direction from the rear 1 st region, The front side portion has a front side 2 nd region at a position further to the rear side in the longitudinal direction than the front side 1 st region, The upper core has a region where the non-groove region continues from one end to the other end in the width direction between the groove region of the upper core located in the rear side 2 nd region and the groove region of the upper core located in the front side 2 nd region in the longitudinal direction.
  4. 4. The absorbent article of claim 1, wherein the absorbent article comprises, The rear portion has a rear 2 nd region at a position on the front side in the longitudinal direction from the rear 1 st region, The value obtained by dividing the area of the groove region of the upper core located at the widthwise central portion of the rear side 2 region by the area of the widthwise central portion of the rear side 2 region is larger than the value obtained by dividing the area of the groove region of the upper core located at the widthwise central portion of the rear side 1 region by the area of the widthwise central portion of the rear side 1 region.
  5. 5. The absorbent article of claim 1, wherein the absorbent article comprises, The front side portion has a front side 2 nd region at a position further to the rear side in the longitudinal direction than the front side 1 st region, The upper core located at the widthwise central portion of the front side 1 st region includes a greater number of the grooves having a length in the longitudinal direction, which is the predetermined direction, than the upper core located at the widthwise central portion of the front side 2 nd region.
  6. 6. The absorbent article of claim 1, wherein the absorbent article comprises, The absorbent article has a pair of leakage preventing wall parts capable of rising toward the skin side on both side parts in the width direction of the absorbent core, When the absorbent article is viewed in the expanded and stretched state in the thickness direction, the upper core has the groove region at least a part of which overlaps the leakage preventing wall portion.
  7. 7. The absorbent article of claim 1, wherein the absorbent article comprises, The underlying core has a superabsorbent polymer, The superabsorbent polymer of the upper core has an average density that is higher than the average density of the superabsorbent polymer of the lower core.
  8. 8. The absorbent article of claim 1, wherein the absorbent article comprises, The average density of the superabsorbent polymer on the non-skin side portion of the non-grooved region is lower than the average density of the superabsorbent polymer on the skin side portion of the non-grooved region.
  9. 9. The absorbent article of claim 1, wherein the absorbent article comprises, The grooves are recessed from the skin side surface of the upper core toward the non-skin side in the thickness direction.
  10. 10. The absorbent article of claim 9, it is characterized in that the method comprises the steps of, The average density of the superabsorbent polymer on the non-skin side portion of the groove region is lower than the average density of the superabsorbent polymer on the skin side portion of the non-groove region.
  11. 11. The absorbent article of claim 10, it is characterized in that the method comprises the steps of, The upper core includes a liquid-absorbent fiber in addition to the superabsorbent polymer, The average density of the liquid-absorbent fibers in the non-skin side portion of the non-groove region is higher than the average density of the liquid-absorbent fibers in the non-skin side portion of the groove region.
  12. 12. The absorbent article of claim 1 or 2, The lower core is provided with a superabsorbent polymer, When the lower core is divided into two in the thickness direction, the skin-side portion is defined as a skin-side portion and the non-skin-side portion is defined as a non-skin-side portion, and, at this time, At least a part of the lower core has an average density of the superabsorbent polymer on the skin side portion of a certain region of the lower core higher than an average density of the superabsorbent polymer on the non-skin side portion of a region of the upper core facing the certain region.
  13. 13. The absorbent article of claim 1, wherein the absorbent article comprises, The grooves include a main groove having a length in the longitudinal direction as the predetermined direction and a sub groove extending from the main groove in the width direction, The plurality of main grooves are arranged at intervals in the width direction, The plurality of slave grooves are spaced apart in the longitudinal direction and extend from the master groove in the width direction.
  14. 14. The absorbent article of claim 1, wherein the absorbent article comprises, The lower core has a super absorbent polymer and has a2 nd groove in which a part of the lower core is recessed in the thickness direction, The 2 nd groove has a length in the longitudinal direction, The lower core has a2 nd groove region where the 2 nd groove is provided and a2 nd non-groove region where the 2 nd groove is not provided when viewed in the thickness direction, At least a part of the 2 nd groove region is provided in a region where the upper core overlaps with the lower core when viewed in the thickness direction, When the lower core is divided into two in the thickness direction, the skin-side portion is defined as a skin-side portion and the non-skin-side portion is defined as a non-skin-side portion, and, at this time, The average density of the superabsorbent polymer on the skin side portion of the 2 nd groove region is lower than the average density of the superabsorbent polymer on the skin side portion of the 2 nd non-groove region.
  15. 15. The absorbent article of claim 14, it is characterized in that the method comprises the steps of, The average density of the superabsorbent polymer on the non-skin side portion of the 2 nd non-grooved region is lower than the average density of the superabsorbent polymer on the skin side portion of the 2 nd non-grooved region.
  16. 16. The absorbent article of claim 14 or 15, The 2 nd groove is a groove recessed from the non-skin side surface of the lower core toward the skin side in the thickness direction.
  17. 17. The absorbent article of claim 14, it is characterized in that the method comprises the steps of, The groove region of the upper core has a portion overlapping with the 2 nd groove region of the lower core when viewed in the thickness direction.
  18. 18. The absorbent article of claim 1, wherein the absorbent article comprises, The lower core has a slit penetrating the lower core in the thickness direction at the center in the width direction of the region where the crotch of the wearer is in contact with, The slit has a length in the longitudinal direction, The slit of the lower core overlaps the upper core when viewed in the thickness direction, and the region of at least a part of the slit of the lower core does not overlap the groove region of the upper core.
  19. 19. The absorbent article of claim 18, it is characterized in that the method comprises the steps of, An elastic member that stretches in the longitudinal direction is disposed in a region where the crotch of the wearer is in contact with the crotch, When viewed in the thickness direction, all regions of the slits of the lower core do not overlap with the groove regions of the upper core, The slit has a portion overlapping the elastic member when viewed in the thickness direction.
  20. 20. The absorbent article of claim 18 or 19, The groove region has a length in a longitudinal direction which is the predetermined direction, The upper core has a region where the non-grooved region continues from one end to the other end in the width direction at a position on the rear side in the longitudinal direction of the slit, The rear end of the lower core is located at the rear side of the rear end of the upper core in the longitudinal direction.

Description

Absorbent article Technical Field The present invention relates to an absorbent article. Background Patent document 1 discloses an absorbent article having an absorber composed of two layers of an upper layer absorber and a lower layer absorber. A slit penetrating the upper layer absorber in at least the thickness direction is provided at the widthwise center of the upper layer absorber. In addition, the weight ratio of superabsorbent polymer to pulp fibers is higher in the upper layer absorber than in the lower layer absorber. In this way, the excretory fluid is also supplied to the upper layer absorber, but is supplied to the lower layer absorber preferentially through the slit. The liquid component absorbed by the lower layer absorber is absorbed by the upper layer absorber after the absorption saturation of the lower layer absorber, and is held by the super absorbent polymer of the upper layer absorber. Therefore, the composition is excellent in rewet (backflow) prevention. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2017-63923 Disclosure of Invention Problems to be solved by the invention However, if a relatively large slit is provided in the upper layer absorber (upper layer core) as in patent document 1, the excreta liquid is locally absorbed in a punctiform manner in the portion of the lower layer absorber (lower layer core) facing the slit. There is a limit to the range in which the excreta liquid spreads from the point-like absorbed portion, and the excreta liquid cannot be absorbed in a wide range of the lower layer absorber. The upper layer absorber also absorbs the excreta liquid only in the range where the excreta liquid is diffused by the lower layer absorber, and cannot be effectively used. In addition, the portion of the upper layer absorber where the large slit is provided, the excretory fluid absorbed by the lower layer absorber is not sucked up by the upper layer absorber but flows back, is easily brought into contact with the skin, and is insufficient in terms of rewet prevention. The present invention has been made in view of the above-described problems, and an object of the present invention is to improve the diffusivity of the excreta liquid at the upper core and the lower core and to suppress rewet in an absorbent article in which the upper core and the lower core are laminated. Means for solving the problems The main invention for achieving the above object is an absorbent article having a longitudinal direction, a width direction, and a thickness direction, and having an absorbent core, characterized in that the absorbent core comprises an upper core having a high absorbent polymer and a lower core disposed on the non-skin side of the upper core in the thickness direction, the upper core has grooves in which a part of the upper core is recessed in the thickness direction, the grooves have a length in a predetermined direction, the upper core has a groove region in which the grooves are provided and a non-groove region in which the grooves are not provided, when viewed in the thickness direction, a region in which the upper core and the lower core overlap is provided, at least a part of the groove region is provided, when the upper core is divided into two parts in the thickness direction, a part on the skin side is set as a skin side, a part on the non-skin side is set as a non-skin side, and at this time, the high absorbent polymer on the side of the groove region has a higher average density than the non-absorbent polymer on the skin side of the non-skin side. Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings. ADVANTAGEOUS EFFECTS OF INVENTION According to the present invention, in an absorbent article in which an upper core and a lower core are laminated, it is possible to improve the diffusivity of excreta liquid at the upper core and the lower core and suppress rewet. Drawings Fig. 1 is a schematic perspective view of a pants-type diaper 1 (hereinafter also referred to as "diaper"). Fig. 2 is a schematic plan view of the diaper 1 in an extended and stretched state as seen from the skin side. Fig. 3 is a schematic cross-sectional view taken along line a-a of fig. 2. Fig. 4 is a plan view of the upper core 31 as viewed from the skin side in the thickness direction. Fig. 5 is a plan view of the lower core 32 viewed from the skin side in the thickness direction. Fig. 6 is a plan view of the laminated upper core 31 and lower core 32 as viewed from the skin side in the thickness direction. Fig. 7 is a schematic cross-sectional view of a part of the upper core 31 and the lower core 32. Fig. 8A is a schematic cross-sectional view taken along line I-I of fig. 6, and fig. 8B is a schematic cross-sectional view taken along line II-II of fig. 6. Fig. 9A is a schematic perspective view of the core-spun sheet 39, and fig. 9B is an explanatory vi