JP6341719B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article, and more particularly, to an absorbent article such as a light incontinence pad, a panty liner, a sanitary napkin, a cage absorbent pad, and a urine absorbent pad.

DESCRIPTION OF RELATED ART Conventionally, the absorbent article provided with a liquid-permeable surface sheet, a liquid-impermeable back sheet, and the liquid absorption pinched | interposed between a surface sheet and a back sheet is known. For example, Patent Document 1 discloses an absorbent article having a top sheet, a back sheet, and an absorbent body disposed between the two sheets. The absorbent body has a large number of block-shaped absorbent parts separated from each other. Leak-proof grooves that are regularly arranged and compressed by absorbing the absorbent portion from the surface sheet side are formed, the absorbent portion contains pulp fibers and a water-absorbing polymer, and the surface sheet and the absorbent body in the leak-proof groove An absorbent article is disclosed in which the bonding strength (N ₁ ) is lower than the force (N ₂ ) provided by the swelling pressure of the water-absorbing polymer.

JP 2012-120707 A

The invention disclosed in Patent Document 1 has an object to provide a sanitary napkin that can be quickly cleaned in view of the custom of cleaning used sanitary napkins mainly in the ASEAN region. By making the bonding strength (N ₁ ) between the surface sheet and the absorbent body in this case lower than the force (N ₂ ) given by the swelling pressure of the water-absorbing polymer, the leakage-proof groove is lifted during washing, and the washing water As a result of the formation of the outflow path, cleaning is facilitated.

  However, the absorbent article of Patent Document 1 has a problem that the supply rate of the cleaning water to the liquid absorption is slow because the cleaning water is supplied to the absorber only through the top sheet. In order to solve this problem, it is conceivable to provide an opening in the top sheet. However, if the surface sheet is simply provided with openings, the water-absorbing polymer swollen during cleaning may leak from the openings and scatter around. Moreover, when the leakage prevention groove floats in the absorbent article of Patent Document 1, the water-absorbing polymer moves freely in the absorbent article, and unevenly swells in the corners of the absorbent article. The joint with the back sheet may break.

  In view of the above, an object of the present invention is to provide an absorbent article in which leakage from the opening of the swollen water-absorbing polymer during cleaning and breakage due to uneven distribution of the water-absorbing polymer in the corners are suppressed. To do.

  The present invention includes a top sheet, a back sheet, and an absorbent body sandwiched between the front and back sheets, the absorbent core including a water-absorbing polymer, and an integral or separate upper layer covering the absorbent core. The present invention relates to a vertically long absorbent article including a covering sheet and a lower layer covering sheet, wherein the upper layer covering sheet is located on the top sheet side and the lower layer covering sheet is located on the back sheet side.

In the wearing article of the present invention, at least a part of the absorbent core is bonded to at least one of the upper layer and the lower layer covering sheet with an adhesive, and the absorbent article has the surface sheet and the upper layer covering sheet at least in the central region of the surface sheet. through in the thickness direction of the absorbent article has an opening that reaches into the absorbent core, the pore size of the open pores, rather smaller than the particle size at the time of water-saturated swelling of the water-absorbing polymer, the absorber includes a central And a first pressing recess, a second pressing recess, and a third pressing recess arranged so as to surround the central portion, and the first pressing recess, the second pressing recess, and the third pressing recess are lower layers The cover sheet is formed by pressing toward the upper cover sheet. In the thickness direction, the thickness of the second pressing recess is larger than the thickness of the first pressing recess, and the thickness of the third pressing recess is the second pressing recess. Larger than the thickness of the bottom, and in the third pressed recess The absorbent core is interposed between the first cover and the upper cover sheet, the first pressing recesses are interspersed in the lower covering sheet, and the adjacent first pressing recesses are connected by the second pressing recesses, and the third pressing recesses. Is a portion that is deviated from the central portion, and is surrounded by the first and second compressed concave portions, while in a portion that is adjacent to the central portion, is connected to the central portion, and the position, shape, and size of the central portion are Corresponding to the central area, a plurality of outer pressing grooves surrounding the central area are arranged around the central area of the top sheet, the outer pressing grooves are recessed from the top sheet toward the back sheet, and between the adjacent outer pressing grooves The separation region is located in the center region, the separation region and the third pressing recess are adjacent to each other around the center region, and the absorbent core included in the center region, the separation region, and the third pressing recess is continuous .

  In the absorbent article of the present application, the pore diameter of the opening that penetrates the top sheet and reaches the inside of the absorbent core is smaller than the particle diameter at the time of water saturation swelling of the water absorbent polymer, so that the water absorbent polymer swollen at the time of washing is Leakage from the opening is prevented. Furthermore, since at least a part of the absorbent core is bonded to at least one of the upper layer and the lower layer covering sheet with an adhesive, the absorbent polymer is prevented from being unevenly distributed in the corners of the absorbent article during the cleaning. The property article is prevented from breaking.

The drawings illustrate specific embodiments of the invention and include selective and preferred embodiments as well as the essential features of the invention.
The top view which looked at the sanitary napkin of an example of an absorbent article from the surface sheet side. The top view which looked at the absorber from the lower layer coating sheet side. FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 2. The IV-IV line partial expanded sectional schematic diagram of FIG. The schematic diagram which shows the position of an opening, a pressing recessed part, and a pressing groove. The top view which looked at the sanitary napkin which concerns on a modification from the surface sheet side. The partial expanded cross-section schematic diagram of the sanitary napkin which concerns on another modification.

  The following embodiments relate to the absorbent article 10 shown in the accompanying drawings and include not only an indispensable structure of the invention but also a selective and preferable structure. Hereinafter, an embodiment of a sanitary napkin 10 which is an example of an absorbent article 10 according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a plan view of a vertically-long sanitary napkin 10 according to the present invention. The sanitary napkin 10 has a surface facing the wearer's skin (hereinafter simply referred to as “skin facing surface”) and a surface on the opposite side (hereinafter simply referred to as “non-skin facing surface”). In the drawings attached to the present application, X indicates the width direction of the sanitary napkin 10, Y indicates the longitudinal direction of the sanitary napkin 10, and Z indicates the thickness direction perpendicular to the width direction X and the longitudinal direction Y. Indicates.

  The sanitary napkin 10 includes a liquid-permeable top sheet 11 positioned on the skin facing surface side, a liquid-impermeable back sheet 12 positioned on the non-skin facing surface side, and between the top sheet 11 and the back sheet 12. And the absorber 20 sandwiched between the two. The absorbent body 20 includes an upper layer covering sheet 22 located on the top sheet 11 side, a lower layer covering sheet 23 located on the back sheet 12 side, and an absorbent core 21 sandwiched between the upper layer and the lower layer covering sheets 22 and 23. . The upper layer and lower layer covering sheets 22 and 23 of this embodiment are rectangular liquid-permeable sheet members having substantially the same shape and size. Instead of this, the upper layer and lower layer covering sheets 22 and 23 may be constituted by a single sheet member, and the absorbent core 21 may be wrapped by the single sheet member to form the absorbent body 20.

  In the plan view of the sanitary napkin 10 viewed from the top sheet 11 side, a plurality of apertures 13 are arranged in the central region 14 of the top sheet 11. The central area 14 is an area facing the wearer's excretion opening when the sanitary napkin 10 is used, and the opening 13 is arranged only in the central area 14 of the topsheet 11. In addition, a plurality of outer compressed grooves 15 are disposed around the plurality of openings 13, and an outer compressed groove 17 is disposed outside the outer compressed grooves 15. In the thickness direction Z of the sanitary napkin 10, the opening 13, the outer pressing groove 15, and the surrounding pressing groove 17 all enter the absorbent core 21.

  The front and back sheets 11, 12 and the upper layer and lower layer covering sheets 22, 23 have a width direction X and a longitudinal direction Y dimension larger than those of the absorbent core 21, and in plan view, the front and back sheets 11, 12, and the upper layer and The lower layer covering sheets 22 and 23 extend to the outside of the absorbent core 21. The top sheet 11 is a sheet member whose both side edges extending in the longitudinal direction Y are straight, and both end edges extending in the width direction X are arc-shaped, and the width direction X dimension is the same as or larger than that of the upper layer and lower layer covering sheets 22, 23. The direction Y dimension is larger than the upper and lower covering sheets 22 and 23. The back sheet 12 is a sheet member having the same shape as the outline shape of the sanitary napkin 10.

  The sanitary napkin 10 of the present embodiment further includes a pair of side sheets 35 joined to both side portions 11a of the surface sheet 11 extending in the longitudinal direction Y. The side sheet 35 is included in the wing portion 36 that extends to both sides in the width direction X of the sanitary napkin 10. The wing part 36 is comprised by the side sheet 35 and the back surface sheet 12 (refer FIG. 4). An adhesive 37 for temporarily fixing the sanitary napkin 10 to the wearer's underwear is applied to the non-skin facing surface of the back sheet 12. In addition, the wing part 36 is not essential, and the present invention can be carried out by omitting the wing part 36.

  The top sheet 11, the upper and lower layer covering sheets 22, 23, the back sheet 12, and the side sheets 35 that extend outward in the width direction X of the absorbent core 21 are arranged along both side portions 11a of the top sheet 11 extending in the longitudinal direction Y. The pair of joined portions 38 are overlapped and joined to each other. The back sheet 12 and the side sheet 35 that extend further outward in the width direction X from the joint portion 38, and the top sheet 11 and the back sheet 12 that extend outward in the longitudinal direction Y of the absorbent core 21 follow the outer peripheral edge of the sanitary napkin 10. Are joined to each other at the outer peripheral seal portion 39.

  The shape of the sanitary napkin 10 is not particularly limited as long as it matches the shape of the female body and the underwear, and can be, for example, rectangular, elliptical, or saddle-shaped.

  For the liquid-permeable surface sheet 11, a sheet material that can permeate liquid components contained in body fluid, such as an open plastic film, a woven fabric, and a non-woven fabric, can be used. Either natural fibers or chemical fibers can be used as the material for the woven and non-woven fabrics. Nonwoven fabrics produced using thermoplastic hydrophobic chemical fibers can be suitably used in the present invention because the strength does not decrease even when washed with water.

  The fineness of the fibers constituting the nonwoven fabric is preferably in the range of 1.1 to 8.8 dtex, considering the ease of penetration of body fluids and the touch. Also, considering the ease of penetration of body fluids and rewetting back (the body fluid absorbed by the absorbent body 20 oozes out to the surface side), a hydrophilic agent or a water repellent is kneaded into the above-mentioned hydrophobic synthetic fiber. It can also be coated or coated on the surface of a hydrophobic synthetic fiber.

  The topsheet 11 can be made of a nonwoven fabric with irregularities on the skin surface side. For example, the upper layer side is concavo-convexly formed by shrinking the lower layer side using heat-shrinkable fibers, or air is applied during web formation. Thus, an uneven nonwoven fabric having a difference in basis weight can be used. By forming such unevenness on the surface of the nonwoven fabric, the contact area with the skin can be reduced.

The liquid-impermeable back sheet 12 includes a thermoplastic resin film mainly composed of a thermoplastic resin such as polyethylene or polypropylene, a thermoplastic resin film imparted with air permeability, a nonwoven fabric such as spunbond or spunlace, and air permeability. A composite sheet joined with a thermoplastic resin film, a multi-layer nonwoven fabric such as SMS, and the like can be suitably used. Considering the flexibility that does not impair the feeling of wearing, it is preferable to use a film having a mass per unit area of 15 to 30 g / m ² mainly composed of a low density polyethylene resin, for example.

  A sheet material similar to that of the top sheet 11 can be used for the side sheet 35. However, in order to make it difficult for the body fluid to flow to the outside of the sanitary napkin 10, it is preferable to use a sheet material having hydrophobicity or water repellency. Specifically, a spunbond nonwoven fabric, an SMS nonwoven fabric, etc. are mentioned.

  The joining of each sheet member in the joining part 38 and the outer peripheral seal part 39 is performed by joining with a known welding means such as joining with an adhesive, ultrasonic welding, thermal welding, laser welding, high-frequency welding, and joining by embossing. Or it can carry out in combination. Moreover, it is preferable that the surface sheets 11, the upper layer covering sheet 22, the lower layer covering sheet 23, and the back surface sheet 12 are joined to each other between the facing surfaces of the respective sheets. The joining between the opposing surfaces of these sheets can also be performed by the same means as described above. When the front and back sheets 11 and 12 and the upper and lower coating sheets 22 and 23 are nonwoven fabrics made of thermoplastic hydrophobic chemical fibers, each sheet member is obtained by melting the thermoplastic chemical fibers by ultrasonic welding or thermal welding. If the sanitary napkin 10 is washed with water, the joining strength between the sheet members does not decrease.

  As an example of joining the respective sheet members by embossing, a surface sheet 11, a side sheet 35, an upper layer and a lower layer covering sheet constituting the sanitary napkin 10 between an embossing roll having a plurality of protrusions and an anvil roll 22, 23, and the back surface sheet 12 are passed through, and the outer peripheral seal part 39 of the sanitary napkin 10 is embossed. By heating the embossing roll and the anvil roll and controlling them at an appropriate temperature, each sheet member can be softened to obtain a clear embossing pattern. Examples of the emboss pattern include a lattice shape, a staggered shape, and a wave shape.

  As the adhesive used in the present invention, a hot melt adhesive can be suitably used. Even if the hot melt adhesive oozes out to the outer surface of the sanitary napkin 10, it is preferable that the hot melt adhesive does not exhibit tackiness at that time. As a specific example, hot-melt adhesion obtained by melt mixing a composition containing 5 to 25% SEBS, 40 to 60% alicyclic saturated hydrocarbon, 1 to 10% aromatic modified terpene, and 15 to 35% additive. Agents. Examples of the method for applying the hot melt adhesive include coating methods such as spiral coating, coater coating, curtain coater coating, and spray coating. It is preferable that the sheet members coated with the hot-melt adhesive are stacked and then pressed by embossing, and preferably bonded by heating and pressing.

  With reference to FIG. 2 and FIG. 3, the absorber 20 of this embodiment is demonstrated. 2 is a plan view of the absorbent body 20 as viewed from the lower layer covering sheet 23 side, and FIG. 3 is a schematic cross-sectional view taken along the line III-III of FIG. In order to facilitate understanding, in FIGS. 2 and 3, the shape of the absorbent body 20 before being sandwiched between the top sheet 11 and the back sheet 12 is shown. The opening 13, the outer pressing groove 15, and the surrounding pressing groove 17 entering the inside are not shown.

  The absorbent body 20 includes an absorbent core 21 including a water-absorbing polymer 31, an upper layer coating sheet 22 disposed on the top sheet 11 side, and a lower layer coating sheet 23 disposed on the back sheet 12 side. The absorbent core 21 is sandwiched between an upper layer coating sheet 22 coated with a hot melt adhesive (not shown) on the non-skin facing surface and a lower layer coating sheet 23 coated with a hot melt adhesive on the skin facing surface, The upper and lower coating sheets 22 and 23 are joined with a hot melt adhesive. Thereby, during use of the sanitary napkin 10 and during washing, it is possible to prevent the absorbent core 21 from moving between the upper layer covering sheet 22 and the lower layer covering sheet 23, and the water absorbent polymer 31 can be removed from the opening 13. Leakage can be prevented. Further, the water-absorbing polymer 31 may be distributed substantially uniformly in the absorbent core 21 or may be unevenly distributed on the side closer to either the upper layer or the lower layer covering sheets 22, 23. If the water-absorbing polymer 31 is unevenly distributed on the lower layer covering sheet 23 side, it is possible to more effectively prevent the water-absorbing polymer 31 from leaking from the opening 13 during cleaning.

  When the hot melt adhesive is applied to the upper and lower coating sheets 22 and 23, the hot melt adhesive is spaced from the upper and lower coating sheets 22 and 23 in order to prevent the penetration of body fluids by the hot melt adhesive. It is preferable to apply with a gap. Specifically, it is preferable to apply the hot melt adhesive in a dot shape, a stripe shape, a wave shape or a spiral shape. The hot melt adhesive is applied only to the portions of the upper layer and lower layer coating sheets 22 and 23 facing the absorbent core 21, and the upper layer and lower layer coating sheets 22 and 23 extend to the outside in the width direction X of the absorbent core 21. It is preferable not to apply to. The portions where the upper layer and lower layer covering sheets 22, 23 extend outward in the width direction X of the absorbent core 21 are portions included in the joint portion 38. Therefore, by not applying the hot melt adhesive to this portion, when the sanitary napkin 10 is used, the adhesive is prevented from oozing out from the joint portion 38 and coming into contact with the wearer's skin, which makes the wearer uncomfortable. There is no reminding.

  As the liquid-permeable upper layer and lower layer covering sheets 22 and 23, the same non-woven fabric as the above surface sheet 11 can be used. The kind of nonwoven fabric used for each of the upper layer and the lower layer covering sheets 22 and 23 may be the same or different. Preferably, the upper layer covering sheet 22 is composed of a nonwoven fabric made only of thermoplastic fibers, particularly a nonwoven fabric manufactured by an air-through method. When the absorbent core 21 has a sufficient amount of liquid holding performance, the lower layer covering sheet 23 can be composed of a nonwoven fabric composed only of hydrophobic thermoplastic fibers. When the absorbent core 21 does not have a sufficient amount of liquid holding performance, it is preferable that the lower layer covering sheet 23 is made of a material that complements the absorption performance and is difficult to twist. For example, it is manufactured by the airlaid method or the like. It is preferable to form the lower layer covering sheet 23 with a non-woven fabric. Nonwoven fabrics produced using thermoplastic hydrophobic chemical fibers can be suitably used in the present invention because their strength does not decrease and are not easily torn even when washed with water. As described above, the upper layer and lower layer covering sheets 22 and 23 can be composed of a single sheet member, or can be composed of different sheet members. If the upper layer covering sheet 22 and the lower layer covering sheet 23 are made to be different sheet members, different functions can be imparted to the upper layer covering sheet 22 and the lower layer covering sheet 23, respectively. For example, the upper-layer coating sheet 22 is required to transfer body fluid to the absorbent core 21 quickly or to allow the washing water to pass through easily during washing. Since the lower layer covering sheet 23 is on the non-skin contact surface side of the absorbent core 21, diffusibility, body fluid retention, or recoverability to prevent the absorbent core 21 from becoming difficult to wash due to kinking during washing. Is required. By imparting different functions to each other, it is more absorbable and easier to clean.

The absorbent core 21 includes absorbent fibers 32 made of a hydrophilic material and a water absorbent polymer 31. Examples of absorbent fibers 32 made of hydrophilic material include ground pulp and cotton made of cellulose, rayon and fibril rayon made of regenerated cellulose, acetate, triacetate made of semi-synthetic cellulose, and polyvinyl alcohol fiber made of hydrophilic polymer. These can be used alone or in combination. From the viewpoint of cost and ease of molding, pulverized pulp is preferred. The mass per unit area (hereinafter referred to as basis weight) of the absorbent fiber 32 can be about 100 to 650 g / m ² . The basis weight of the absorbent fibers 32 included in the absorbent core 21 may be uniform, or the basis weight may be different depending on the location. For example, the basis weight of the portion corresponding to the central region 14 of the sanitary napkin 10 can be 300 g / m ² , and the basis weight of the peripheral portion can be 200 g / m ² or less. Thereby, when the sanitary napkin 10 is used, the excreted body fluid can be absorbed mainly in the central region 14.

  The water-absorbing polymer 31 is preferably polymer particles capable of absorbing and retaining 20 times or more of its own weight, and examples of the water-absorbing polymer 31 include celluloses such as starch and carboxymethylated cellulose, polyacrylates, Mention may be made, for example, of water-absorbing polymers 31 of polysulphonate, maleic anhydride, polyacrylamide, polyvinyl alcohol and polyethylene oxide.

  Moreover, a cellulose foam, a cellulose acetate foam, etc. can be used as the absorption core 21, and after shape | molding these foams, it can also shape | mold and use for the shape of the desired absorption core 21. Furthermore, in order to give the absorbent body 20 an additional function, a granular deodorant selected from silica, activated carbon, aluminosilicate compound, zeolite, or the like, a granular antibacterial agent, or a granular coolant having a cooling effect due to an endothermic effect, etc. Can also be used together.

  As shown in FIGS. 2 and 3, the absorbent body 20 includes a plurality of first pressing recesses 24 and second pressing recesses 25 formed by pressing the lower layer covering sheet 23 toward the upper layer covering sheet 22. Further, a plurality of third pressing recesses 26 are provided, at least part of which is surrounded by the first and second pressing recesses 24 and 25. In the thickness direction Z of the absorbent body 20, the thickness of the second pressing recess 25 is larger than the first pressing recess 24. In other words, in the thickness direction Z of the absorbent body 20, the separation distance between the lower layer covering sheet 23 and the upper layer covering sheet 22 at the bottom of the second pressing recess 25 is the same as that of the lower layer covering sheet 23 at the bottom of the first pressing recess 24. It is larger than the separation distance of the upper layer covering sheet 22. In a plan view of the absorbent body 20 as viewed from the lower layer covering sheet 23 side, the first pressing recesses 24 are scattered in the lower layer covering sheet 23, the adjacent first pressing recesses 24 are connected by the second pressing recesses 25, A mesh-shaped pattern is formed by the aggregate of the first and second pressing recesses 24 and 25. In addition, at the bottom of the first pressing recess 24, at least a part of the lower layer covering sheet 23 is joined to the upper layer covering sheet 22. In the second pressing recess 25, the absorbent core 21 is interposed between the lower layer covering sheet 23 and the upper layer covering sheet 22. The third pressing recess 26 is thicker than the second pressing recess 25, and the absorbent core 21 is interposed between the lower layer covering sheet 23 and the upper layer covering sheet 22.

  The 1st-3rd pressing recessed parts 24, 25, and 26 are located in the outer side of the center area 14 in the planar view which looked at the sanitary napkin 10 from the surface sheet 11 side. In this embodiment, the 1st pressing recessed part 24 and the 2nd pressing recessed part 25 which connects the 1st pressing recessed part 24 mutually form the mesh shape formed in a some regular hexagon, and the 1st pressing recessed part 24 is a regular hexagon. Located at each vertex. The 2nd pressing recessed part 25 is arrange | positioned at each edge | side of a regular hexagon. Moreover, the 3rd pressing recessed part 26 is located inside the regular hexagon formed by the 1st and 2nd pressing recessed parts 24 and 25. As shown in FIG. The shape formed by the first and second pressing recesses 24 and 25 is not limited to the mesh shape formed by a plurality of regular hexagons, but may be a mesh shape formed by combining one or more types of polygons. For example, it can also be corrugated. From the viewpoint of easy adjustment of the thickness of the first and second pressing recesses 24, 25, a mesh shape is preferable.

  The 1st-3rd pressing recessed parts 24, 25, and 26 can be formed by embossing. During embossing, it is preferable to raise the temperature of the embossing roll and the anvil roll to a predetermined temperature. In the embossing process, the portion with the largest pressing depth by embossing spin becomes the first pressing recess 24, and the portion with the pressing depth smaller than the first pressing recess 24 becomes the second pressing recess 25. The third pressing recess 26 is a portion having a pressing depth smaller than that of the second pressing recess 25. In this embodiment, the 3rd pressing recessed part 26 is the part which was contacting the embossing roll surface in the case of embossing, and is a flat part which is not substantially squeezed.

  The collecting core 21 is interposed between the lower layer covering sheet 23 and the upper layer covering sheet 22 at the bottom of the first pressing recess 24 having the largest pressing depth. However, a portion between the lower layer covering sheet 23 and the upper layer covering sheet 22 includes a portion where the collecting core 21 is not interposed between the lower layer covering sheet 23 and the upper layer covering sheet 22. A part of the covering sheet 23 is joined to the upper covering sheet 22. In the second and third pressing recesses 25 and 26 whose pressing depth is smaller than the first pressing recess 24, the lower layer coating sheet 23 is separated from the upper layer coating sheet 22, and between the lower layer coating sheet 23 and the upper layer coating sheet 22. The absorbent core 21 is interposed between the two. In the 2nd pressing recessed part 25, the density of the water absorbing fiber contained in the absorption core 21 is high by pressing. In addition, the relative comparison of the thickness of the 1st-3rd pressing recessed parts 24, 25, 26 can be performed by cut | disconnecting the absorber 20 with a sharp cutter and observing a cut surface visually or with a magnifier. .

  As shown in FIG. 2, the first to third pressing recesses 24, 25, and 26 are disposed in almost the entire area except for the central portion 27 of the absorbent body 20 in a plan view when the absorbent body 20 is viewed from the lower layer covering sheet 23 side. Has been. The position, shape, and size of the central portion 27 of the absorbent body 20 correspond to the central region 14 of the sanitary napkin 10. In the peripheral region of the center portion 27, the second pressing recess 25 is not disposed between the adjacent first pressing recesses 24, and a part of the third pressing recess 26 is connected to the center portion 27. In the central portion 27 of the absorbent core 21, the absorbent core 21 is interposed between the upper layer covering sheet 22 and the lower layer covering sheet 23, and even the third pressing recess 26 absorbs between the upper layer covering sheet 22 and the lower layer covering sheet 23. A core 21 is interposed. Therefore, the absorption core 21 is continuous between the third pressing recess 26 and the central portion 27 at the portion where the third pressing recess 26 is connected to the central portion 27. Moreover, even between the 3rd pressing recessed parts 26 adjacent, the absorption core 21 is continuing by the 2nd pressing recessed part 25 interposing.

  As mentioned above, since the 2nd pressing recessed part 25 in which the absorptive fiber became high density is continuing through the 1st pressing recessed part 24, the rigidity of the absorber 20 improves. In addition, the upper cover sheet 22 and the lower cover sheet 23 are bonded to each other in the first pressing recess 24, the absorbent core 21 is bonded to the upper layer and the lower cover sheets 22, 23, and the third press. Since the recess 26 is surrounded by the first and second pressing recesses 24 and 25, the absorption core 21 is suppressed from moving in the width direction X and the longitudinal direction Y in the absorber 20. Thereby, during use of the sanitary napkin 10, it is possible to prevent the absorber 20 from being deformed or twisted. Moreover, since the 1st-3rd pressing recessed parts 24, 25, and 26 are arrange | positioned at the lower layer coating sheet 23 side of the absorption core 21, a wearer passes 1st-1st through the surface sheet 11 during use of the sanitary napkin 10. There is no feeling of discomfort due to the unevenness of the third pressing recesses 24, 25, 26.

  Referring to FIG. 4, in sanitary napkin 10, absorbent body 20 is sandwiched between top sheet 11 and back sheet 12 coated with a hot melt adhesive. The hot melt adhesive is preferably applied in the form of dots, stripes, waves, or spirals. A plurality of apertures 13 are arranged in the central region 14 of the topsheet. Around the plurality of openings 13, a plurality of outer compressed grooves 15 are arranged so as to surround the central region 14. As shown in FIG. 4, the opening 13 penetrates the top sheet 11 and the upper cover sheet 22 in the thickness direction Z and reaches the absorbent core 21. The outer compressed groove 15 is recessed from the top sheet 11 toward the back sheet 12 and enters the absorbent core 21. An absorbent core 21 is interposed between the bottom of the outer compressed groove 15 and the back sheet 12.

  The opening 13 is formed by embossing, and a part of the top sheet 11 that is broken by being pushed by embossing spins into a truncated cone shape that gradually decreases in diameter, and enters the opening 13. In addition, a part of the upper covering sheet 22 that is pushed by the embossed spin and breaks also becomes a truncated cone shape that gradually decreases in diameter, and enters the opening 13, and at least the absorption core 21 in the side wall 13 a of the opening 13. Cover part. A part of the absorbent core 21 is exposed at a portion of the side wall 13a of the opening 13 that is not covered with the upper layer covering sheet 22. Note that the truncated cone shape referred to in the present application means a truncated cone having no bottom surface and no top surface, or a three-dimensional shape similar to the truncated cone shape.

  Since the top sheet 11 and the upper covering sheet 22 are gradually truncated in a conical shape and enter the opening 13, the transition of the body fluid to the absorption core 21 is promoted during use of the sanitary napkin 10. Is done. On the other hand, during the cleaning of the sanitary napkin 10, the water absorbent polymer 31 is prevented from leaking through the opening 13. Moreover, the upper layer covering sheet 22 covers at least a part of the absorbent core 21 on the side wall 13 a of the opening 13, thereby further suppressing the water absorbent polymer 31 from leaking from the opening 13. Further, when the sanitary napkin 10 is being washed, the opening 13 can also function as a drain for washing water, so that menstrual blood can be easily washed away. The fact that the top sheet 11 and the upper layer covering sheet 22 have a truncated cone shape with a gradually decreasing diameter is a cross section obtained by cutting the portion where the opening 13 is disposed in the sanitary napkin 10 in the thickness direction Z with a sharp cutter. This can be confirmed by observing with a magnifier or a microscope.

  The hole diameter R of the opening 13 is smaller than the particle diameter of the water-absorbing polymer 31 at the time of water saturation swelling. Thereby, when the sanitary napkin 10 is being washed, the water-absorbing polymer 31 is prevented from leaking from the opening 13. In the present invention, the hole diameter R of the opening 13 is defined as the diameter of a circle circumscribing the opening edge of the opening 13 formed in the top sheet 11 in plan view. The hole diameter R of the opening 13 can be measured by photographing the opening 13 from above and measuring the diameter of a circle circumscribing the opening edge of the opening 13 formed in the top sheet 11 from the obtained image. . The hole diameter R of the opening 13 is typically 3 mm or less, preferably 2 mm or less.

In the present invention, the particle size of the water-absorbing polymer 31 at the time of water saturation swelling is the particle size distribution of the water-absorbing polymer 31 measured according to JIS Z 8815, and the mass on the sieve is 90% or more of the mass of the sample. It is defined as the smallest value among the values obtained by saturating a plurality of water-absorbing polymers 31 in the water and measuring the diameter of the circumscribed circle of the water-absorbing polymer 31 that has been saturated and swelled. Specifically, the particle diameter at the time of water saturation swelling of the water-absorbing polymer 31 is measured by the following procedure.
First, a standard sieve defined in JIS Z8801-1 and a scale capable of weighing up to 0.001 g are prepared. The range of the sieve openings used for the measurement varies depending on the particle size of the water-absorbing polymer 31 to be measured. Since the particle size of the water-absorbing polymer 31 for a normal absorbent article is in the range of 100 to 800 μm, a plurality of sieves having an opening of 90 to 850 μm can be selected and used. For example, a sieve having openings of 850, 600, 500, 425, 355, 300, 250, and 150 μm can be used in combination.
The prepared sieves are stacked on a tray so that the openings are in order from small to large. Next, about 50 g of a sample of the water-absorbing polymer 31 is collected and placed on the uppermost sieve, and the sieve is covered with a lid. The mass of the sample is preferably adjusted as appropriate according to the maximum bulk volume of the water-absorbing polymer 31. After sieving the sample for a predetermined time in accordance with JIS Z 8815, the mass of the water-absorbing polymer 31 on each sieve is measured to determine the particle size distribution. The sieving time is the time until the mass of the particle group passing through the sieving for 1 minute from the start of sieving becomes 0.1% or less of the mass of the sample used for measurement. The particle size distribution is measured in a room where the temperature and humidity are adjusted to be constant (for example, temperature 25 ° C., humidity 65%). For the sieving test, a vibration sieving device such as model TSKB8-1 manufactured by Tokyo Screen Co., Ltd. or model VSS-200 manufactured by Tsutsui Riken Kikai Co., Ltd. can be used.
Next, 30 particles of water-absorbing polymer 31 on the sieve whose mass on the sieve is 90% or more of the mass of the sample are arbitrarily collected. For example, a sieving test is performed using the sieve of the above combination, and when the sieve opening has a mesh size of 90% or more of the sample mass of 250 μm, it passes through a 300 μm sieve and is placed on a 250 μm sieve. 30 particles are arbitrarily collected from the plurality of remaining water-absorbing polymer 31 particles. Next, the collected water-absorbing polymer 31 is poured into distilled water and saturated and swelled. The time until the water-absorbing polymer 31 saturates and swells can be obtained by testing in advance. The time until the water-absorbing polymer 31 is saturated and swelled is usually 5 to 60 minutes. For each of the 30 water-absorbing polymers 31 that have been saturated and swollen, the diameter of the circumscribed circle of the swollen particles is determined by microscopic observation or an image analyzer. The smallest value among the diameters of the circumscribed circles obtained in this manner is set as the particle size at the time of water saturation swelling of the water-absorbing polymer 31. In the present invention, it is preferable to use the water-absorbing polymer 31 having a particle size at the time of saturation swelling of 1.5 mm or more, preferably 2.0 mm or more. Moreover, the hole diameter R of the opening 13 can be 70% or less, preferably 60% or less, more preferably 50% or less, of the particle diameter of the water-absorbing polymer 31 at the time of water saturation swelling.

  A plurality of outer compressed grooves 15 disposed in the central region 14 of the sanitary napkin 10 so as to surround the opening 13 are provided with a pair of first groove portions 15a extending in parallel with the longitudinal direction Y and in parallel with the width direction. A pair of second groove portions 15b extending is included. The 1st groove part 15a and the 2nd groove part 15b are not connected, but the isolation | separation area | region 16 is located between the adjacent 1st groove part 15a and the 2nd groove part 15b. The outer squeezing groove 15 is formed by squeezing the top sheet 11 together with the upper cover sheet 22 toward the back sheet 12 by embossing. The separation region 16 is a non-squeezed region that is not squeezed during the embossing. The bottom of the outer compressed groove 15 is separated from the lower layer covering sheet 23, and the absorbent core 21 is interposed between the upper layer covering sheet 22 and the lower layer covering sheet 23. The outer squeezing groove 15 prevents body fluid excreted in the central region 14 of the topsheet 11 from flowing in the width direction X during use of the sanitary napkin 10. Moreover, it is suppressed that the surface sheet 11 peels from the absorber 20. FIG. The separation region 16 is a region that is not squeezed during embossing, and the absorbent core 21 is interposed between the upper layer coating sheet 22 and the lower layer coating sheet 23. Therefore, when the water-absorbing polymer 31 swells in the central portion 27 of the absorbent body 20 when the sanitary napkin 10 is washed, it adheres to the upper layer and lower layer covering sheets 22 and 23 among the absorbent fibers 32 included in the central portion 27. The part which is not done is pushed out of the central part 27 through the separation region 16.

  The separation region 16 is adjacent to the central region 14. Moreover, the isolation | separation area | region 16 is adjacent to the 3rd pressing recessed part 26 arrange | positioned at the absorption core 21 in the planar view seen from the surface sheet 11 side (refer FIG. 5). Therefore, the absorption core 21 included in each of the central region 14, the separation region 16, and the third pressing recess 26 is continuous. In the present embodiment, an annular surrounding pressing groove 17 surrounding the outer pressing groove 15 is further arranged on the top sheet 11. The surrounding pressing groove 17 is also formed by embossing in the same manner as the outer pressing groove 15, and its bottom is separated from the lower layer covering sheet 23.

  Since the opening 13 is disposed in the central region 14 of the topsheet 11, bodily fluid excreted during use of the sanitary napkin 10 is mainly absorbed by the central portion 27 of the absorbent body 20 through the opening 13 and absorbs water. As the conductive polymer 31 swells, the internal pressure of the absorbent body 20 increases. Since the absorbent core 21 is bonded to the upper layer and lower layer covering sheets 22 and 23, the absorbent core 21 does not move in the absorbent body 20 even if the internal pressure of the absorbent body 20 increases during use. When washing the sanitary napkin 10, the washing water mainly flows into the opening 13. Furthermore, since the opening 13 reaches the absorption core 21, a large amount of washing water is circulated through the central portion 27 of the absorbent body 20 that absorbs a large amount of body fluid, so that the sanitary napkin 10 can be washed quickly. it can. On the other hand, when washing water is circulated through the central portion 27 of the absorbent body 20, the water-absorbing polymer 31 contained in the central portion 27 swells and the internal pressure of the absorbent body 20 increases. Also in this case, since the absorbent core 21 is bonded to the upper layer and lower layer covering sheets 22, 23, the movement of the absorbent core 21 in the absorbent body 20 is suppressed, and the water absorbent polymer 31 becomes the sanitary napkin 10. It is suppressed that it is unevenly distributed in the corner. However, when a large amount of washing water circulates, the internal pressure of the absorber 20 may further increase.

  In this invention, the absorption core 21 contained in the center area 14, the isolation | separation area | region 16, and the 3rd pressing recessed part 26 is continuing. For this reason, when a high internal pressure is applied to the central portion 27 of the absorbent body 20, the portion of the absorbent fiber 32 included in the central portion 27 that is not bonded to the upper layer and the lower layer covering sheets 22 and 23 is the third compressed concave portion. 26 is pushed out. Thereby, the internal pressure of the central portion 27 is prevented from excessively rising, and the sanitary napkin 10 is prevented from being broken by the swelling of the water-absorbing polymer 31. In addition, since the pore diameter R of the opening 13 is smaller than the particle diameter of the water-absorbing polymer 31 at the time of water saturation swelling, even if the internal pressure of the central portion 27 increases excessively, the water-absorbing polymer leaks from the opening. It does not scatter around. Further, when the sanitary napkin 10 is being scrubbed, since the washing water is supplied from the separation region 16 to the periphery of the central portion 27 through the third pressing recess 26, the body fluid absorbed in the periphery of the central portion 27 is promptly removed. Can be washed.

  Here, the absorbent fibers 32 and the water-absorbing polymer 31 in the third compressed recesses 26 are directed to the corners of the absorbent body 20 by the absorbent fibers 32 being extruded from the central portion 27 to the third compressed recesses 26. Adds force to move in the direction. In the present invention, the third pressing recess 26 is surrounded by the second pressing recess 25 having a thickness smaller than that of the third pressing recess 26, so that the absorbent fibers 32 and the water absorbent polymer 31 are formed in the third pressing recess 26. Although it is movable outward, the movable volume is limited. As a result, the absorbent fibers 32 and the water-absorbing polymer 31 are restrained from moving toward the corners of the absorbent body 20, and as a result, the water-absorbent polymers 31 are unevenly distributed at the corners of the absorbent body 20 at the time of cleaning. Is prevented from breaking. Moreover, the 2nd pressing recessed part 25 can restrict | limit the volume which can move in the absorber 20 of the absorptive fiber 32 and the water absorbing polymer 31 also when the sanitary napkin 10 is strongly scrubbed. This also prevents the water-absorbing polymer 31 from being unevenly distributed in the corners of the absorbent body 20 at the time of washing and leading to the breakage of the sanitary napkin 10.

  When the movement of the absorbent fiber 32 and the water absorbent polymer 31 to the outside of the third pressing recess 26 is restricted as described above, the water absorbent polymer 31 swells between the central portion 27 and the corner of the absorbent body 20. The sanitary napkin 10 may break. In this invention, the 1st pressing recessed part 24 which joins the upper layer coating sheet 22 and the lower layer coating sheet 23 is dotted, and when the internal pressure of the absorber 20 rises too much on the outer side of the center area 14, it is relative. In particular, stress concentrates on the first pressing recess 24 having a small area, and the bonding between the upper layer covering sheet 22 and the lower layer covering sheet 23 is released. As a result, the internal volume of the absorbent body 20 is increased and the internal pressure of the absorbent body 20 is reduced, so that the sanitary napkin 10 is prevented from being broken.

  In FIG. 6, the top view which looked at the sanitary napkin 10 which concerns on the modification of this invention from the surface sheet 11 side is shown. The only difference from the above embodiment is the shape of the outer compressed groove 15 and the surrounding compressed groove 17. Since other configurations are the same as those of the above-described embodiment, detailed description is omitted. Also in this modified example, the outer compressed groove 15 includes a pair of first groove portions 15a extending in parallel with the longitudinal direction Y and a pair of second groove portions 15b extending in parallel with the width direction, and the first groove portion 15a and the second groove portion 15a. The separation region 16 is located between the adjacent first groove portion 15a and the second groove portion 15b without being connected to the groove portion 15b. In addition, a discontinuous annular surrounding pressing groove 17 surrounding the outer pressing groove 15 is arranged on the top sheet 11. Also in this modified example, the separation region 16 is adjacent to the third pressing recess 26 disposed in the absorbent core 21 in a plan view viewed from the topsheet 11 side. Therefore, the sanitary napkin 10 is prevented from being broken during cleaning in the same manner as described above.

  However, in this modified example, a part of the third pressing recess 26 adjacent to the separation region 16 is traversed by the surrounding pressing groove 17 arranged at a position close to the separation region 16. Thereby, when the internal pressure is added to the center part 27 of the absorber 20, the volume of the absorbent fiber 32 which can move to the 3rd pressing recessed part 26 from the center part 27 is restrict | limited. That is, by adjusting the position of the surrounding pressing groove 17 disposed in the third pressing recess 26 adjacent to the separation region 16, the absorbent fiber 32 that can move from the central portion 27 of the absorbent body 20 to the third pressing recess 26. The volume can be controlled.

  FIG. 7 shows another modification of the present invention. FIG. 7 is a partially enlarged schematic cross-sectional view similar to FIG. In this modification, the opening 13 extends in the thickness direction Z of the sanitary napkin 10, penetrates the top sheet 11 and the upper layer covering sheet 22, further penetrates the absorbent core 21 and reaches the lower layer covering sheet 23. In this case, the area where the absorbent core 21 is exposed in the opening 13 is larger than that in the above embodiment. Thereby, the bodily fluid which has penetrated into the opening 13 when the sanitary napkin 10 is used can be absorbed more quickly. In addition, a part of the top sheet 11 and the upper layer covering sheet 22 enters the opening 13 in a truncated cone shape with a gradually decreasing diameter. For this reason, when the water-absorbing polymer 31 is likely to pass through the opening 13 during the cleaning of the sanitary napkin 10, the top sheet 11 and the upper covering sheet 22 entering the opening 13 become the water-absorbing polymer 31. It is pushed and deformed so as to close the opening 13. Thereby, the water-absorbing polymer 31 is prevented from leaking from the opening 13 when the sanitary napkin 10 is washed.

  As mentioned above, although this invention was demonstrated based on embodiment and its modification, this invention is not limited to these, Various changes can be implemented. For example, in the illustrated example, the first and second pressing recesses 24 and 25 and the outer pressing groove 15 partially overlap each other, but the first and second pressing recesses 24 and 25 are formed in a portion where the outer pressing groove 15 extends. Can not be provided. Moreover, although the bottom part of the outer pressing groove 15 and the surrounding pressing groove 17 gave the example separated from the lower layer coating sheet 23, joining at least one of the outer pressing groove 15 and the surrounding pressing groove 17 to the lower layer coating sheet 23 is mentioned. You can also. The shape of the outer pressing groove 15 and the surrounding pressing groove 17 is not limited to the illustrated example. Moreover, although the example which forms the opening 13, the outer pressing groove 15, and the surrounding pressing groove 17 by embossing was given, forming the opening 13, the outer pressing groove 15, and the surrounding pressing groove 17 by press molding or vacuum forming. You can also. In the specification and claims of this application, the terms “first”, “second”, and “third” are used to distinguish similar elements, positions, and the like.

The disclosure relating to the present invention described above can be organized into at least the following matters.
An absorbent core comprising a top sheet, a back sheet, and an absorbent body sandwiched between the front and back sheets, wherein the absorbent body contains a water-absorbing polymer, and a single or separate upper layer covering sheet and lower layer covering the absorbent core A longitudinally absorbent article in which the upper layer covering sheet is located on the top sheet side and the lower layer covering sheet is located on the back sheet side, and at least a part of the absorbent core is composed of the upper layer and the lower layer covering sheet. The absorbent article is bonded to at least one of the adhesives, and the absorbent article has an opening that penetrates the top sheet and the upper layer covering sheet in the thickness direction of the absorbent article and reaches the absorbent core at least in the central region of the top sheet. and pore size of the open pores, rather smaller than the particle size at the time of water-saturated swelling of the water-absorbing polymer, the absorber includes a central portion, first pressing recess arranged to surround the central portion, the second squeeze Recess and third The first pressing recess, the second pressing recess, and the third pressing recess are formed by pressing the lower layer covering sheet toward the upper layer covering sheet, and the thickness of the second pressing recess is in the thickness direction. The thickness is larger than the thickness of the first pressing recess, and the thickness of the third pressing recess is larger than the thickness of the second pressing recess. In the third pressing recess, an absorption core is interposed between the lower layer covering sheet and the upper layer covering sheet. The first pressing recesses are interspersed in the lower layer covering sheet, the adjacent first pressing recesses are connected by the second pressing recesses, and the third pressing recess is a portion where the first pressing recess and the third pressing recess are separated from the central portion. While being surrounded by the second compressed recess, in the part adjacent to the central part, the central part is connected to the central part, and the position, shape, and size of the central part correspond to the central area and around the central area of the topsheet. Multiple outer shells surrounding the central area Is disposed, the outer compressed groove is recessed from the top sheet toward the back sheet, the separation region is located between the adjacent outer compressed grooves, and around the central region, the separation region and the third compressed recess are adjacent, An absorbent article, characterized in that the absorbent core contained in the central region, the separation region, and the third pressing recess is continuous .

The present invention disclosed in the above paragraph 0055 can include at least the following embodiments. The embodiments can be adopted separately or in combination with each other.
(1) The absorption core is joined to the upper layer and the lower layer covering sheet with an adhesive.
(2) At least one of the upper layer covering sheet and the lower layer covering sheet is made of a nonwoven fabric.
(3) A plurality of apertures are arranged only in the central region of the top sheet.
(4) In the thickness direction, the thickness of the separation region is larger than the thickness of the outer compressed groove, and the absorption core is interposed between the lower layer coating sheet and the upper layer coating sheet in the separation region.
( 5 ) A part of the lower layer covering sheet is joined to the upper layer covering sheet in the first pressing recess, and an absorbing core is interposed between the lower layer covering sheet and the upper layer covering sheet in the second pressing recess.
( 6 ) A part of the top sheet becomes a truncated cone shape with a gradually decreasing diameter, and enters the aperture.
( 7 ) A part of the upper layer covering sheet is formed into a truncated cone shape with a gradually decreasing diameter and enters the opening, and at least a part of the absorbent core is covered on the side wall of the opening.
( 8 ) The water-absorbing polymer contained in the absorbent core is unevenly distributed on the lower layer covering sheet side.

10 Sanitary napkins (absorbent articles)
DESCRIPTION OF SYMBOLS 11 Top sheet 11a Both sides 12 of a surface sheet Back sheet 13 Opening hole 13a Opening side wall 14 Central area 15 Outer pressing groove 15a First groove part 15b Second groove part 16 Separation area 17 Surrounding pressing groove 20 Absorber 21 Absorption core 22 Upper layer Cover sheet 23 Lower layer cover sheet 24 1st pressing recessed part 25 2nd pressing recessed part 26 3rd pressing recessed part 27 Center part 31 of absorbent body Absorbent polymer 32 Absorbent fiber 35 Side sheet 36 Wing part 37 Adhesive 38 Joint part 39 Outer periphery seal Part R Hole diameter X Width direction Y Longitudinal direction Z Thickness direction

Claims (9)

A top sheet, a back sheet, and an absorbent body sandwiched between the front and back sheets, the absorbent core containing a water-absorbing polymer, and an integral or separate upper layer coating that covers the absorbent core A sheet and a lower layer covering sheet, wherein the upper layer covering sheet is located on the top sheet side, and the lower layer covering sheet is a vertically long absorbent article located on the back sheet side,
At least a part of the absorbent core is bonded to at least one of the upper layer and the lower layer covering sheet with an adhesive,
The absorbent article has an opening reaching the inside of the absorbent core through the topsheet and the upper layer covering sheet in the thickness direction of the absorbent article, at least in a central region of the topsheet.
Pore size of the open pores, rather smaller than the particle size at the time of water-saturated swollen of the water-absorbing polymer,
The absorbent body includes a central portion, and a first pressing concave portion, a second pressing concave portion, and a third pressing concave portion arranged so as to surround the central portion,
The first pressing recess, the second pressing recess, and the third pressing recess are formed by pressing the lower layer covering sheet toward the upper layer covering sheet,
In the thickness direction, the thickness of the second pressing recess is larger than the thickness of the first pressing recess, and the thickness of the third pressing recess is larger than the thickness of the second pressing recess,
In the third pressing recess, the absorbent core is interposed between the lower layer covering sheet and the upper layer covering sheet,
The first pressing recesses are scattered in the lower layer coating sheet, and the adjacent first pressing recesses are connected by the second pressing recesses,
The third pressing recess is surrounded by the first pressing recess and the second pressing recess in the portion removed from the center portion, and connected to the center portion in the portion adjacent to the center portion,
The position, shape, and size of the central portion correspond to the central area,
A plurality of outer compressed grooves surrounding the central area are arranged around the central area of the top sheet, the outer compressed grooves are recessed from the top sheet toward the back sheet, and between the adjacent outer compressed grooves The separation area is located at
In the periphery of the central region, the separation region and the third pressing recess are adjacent,
The absorbent article, wherein the absorbent core contained in the central region, the separation region, and the third compressed recess is continuous . The absorptive article according to claim 1 in which said absorption core is joined to said upper layer and lower layer covering sheets with said adhesive.   The absorptive article according to claim 1 or 2 with which at least one of said upper layer covering sheet and said lower layer covering sheet consists of nonwoven fabrics.   The absorptive article according to any one of claims 1 to 3 by which a plurality of said opening are arranged only in said central field of said surface sheet. Prior KiAtsu direction, the thickness of the isolation region is greater than the thickness of the outer compression grooves,
The absorbent article according to any one of claims 1 to 4, wherein the absorbent core is interposed between the lower layer covering sheet and the upper layer covering sheet in the separation region. A part of the lower layer covering sheet is joined to the upper layer covering sheet in the first pressing recess,
The absorptive article according to any one of claims 1 to 5 in which said absorption core interposes between said lower layer covering sheet and said upper layer covering sheet in said 2nd pressing crevice. The absorbent article according to any one of claims 1 to 6 , wherein a part of the surface sheet is formed into a truncated cone shape having a gradually reduced diameter and enters the opening. With a portion enters into said becomes frustoconical aperture whose diameter decreases gradually in the upper covering sheet covers at least a portion of said absorbent core in the side wall of the opening, of claims 1 to 7 The absorbent article in any one. The absorptive article according to any one of claims 1 to 8 in which said water absorption polymer contained in said absorption core is unevenly distributed in said lower layer covering sheet side.