JP2013255566A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure erectability of three-dimensional gathers without deteriorating flexibility against the deformation, which is originally possessed by a block-like absorbent core.SOLUTION: In an absorbent article 10, three-dimensional gather forming sheets 162 are arranged in both side parts along a longitudinal direction to form three-dimensional gathers elongated in the longitudinal direction. In the three-dimensional gather forming sheets 162, a pair of end area joints 162A and 162B, in which front and back end areas and the sheet positioned a skin abutting surface side are joined together, is formed in the longitudinal front and back end areas thereof. An absorbent core 22 has low-rigidity and high-rigidity areas. At least an end, which is positioned to an inseam part C, of the end area joints 162A and 162B is positioned on the high-rigidity area of the absorbent core 22.

Description

  The present invention relates to an absorbent article such as a disposable diaper.

  An absorbent article using a block-shaped absorbent body (absorbent core) provided with a groove-like space extending in the plane direction is known (see Patent Document 1). This document describes a state in which the absorbent core is divided along a virtual line extending in the front-rear direction and a virtual line extending in the width direction. The cores are separated from each other at the divided portions. Since the liquid-absorbent core has such a configuration, it is described in the document that body fluid is absorbed from the top surface of the core and also from the side surface.

  Regarding an absorbent article using a block-shaped absorbent body (absorbent core), the present applicant also disclosed in Patent Document 2 an absorption having a plurality of small absorbent portions and a base sheet positioned on the non-skin contact surface side. The absorbent article provided with the body (absorbent core) is proposed. The adjacent small absorption parts are divided, and a recess is formed between them. According to this absorbent article, there is an advantage that the amount of absorption and retention is improved due to high liquid diffusion performance, and that a large number of small absorbent portions can be effectively used even in absorption for repeated excretion and the like.

JP-A-11-216161 JP 2011-136034 A

  Due to its structure, the block-like absorbent core is easily deformed flexibly against external forces, so that it conforms to the complex undulating skin surface and conforms to the human body that touches the surface without gaps, and the wearer's body It is excellent in the operation follow-up property that is deformed in accordance with the movement of the skin and maintains the state of contact with the skin surface. By the way, in general, absorbent articles are often formed with three-dimensional gathers for preventing side leakage. In the three-dimensional gather, an elastic member is arranged in an extended state at a free end thereof, and the three-dimensional gather is erected by the contraction force of the elastic member. However, when an absorbent core with low rigidity and easy deformation is used, such as a block-shaped absorbent body, the stretchability of the elastic member of the three-dimensional gather is not stable, so that the standing property is not sufficient. In some cases, the effect of preventing side leakage due to three-dimensional gathering may not be sufficiently exhibited. When the rigidity of the absorbent core is increased in order to ensure the standing property of the three-dimensional gather, the fit of the absorbent article is lowered due to that.

  Therefore, the subject of this invention is providing the absorbent article which can eliminate the fault which the prior art mentioned above has.

The present invention includes a top sheet, a back sheet, and an absorbent body disposed between the top sheet and the back sheet, and three-dimensional gather forming sheets are respectively arranged on both sides along the longitudinal direction. An absorbent article in which a three-dimensional gather extending is formed,
The three-dimensional gather forming sheet is joined to a sheet located on the skin contact surface side so that a fixed end and a free end extending in the longitudinal direction are formed on the three-dimensional gather, and the three-dimensional gather forming sheet The front and rear end regions are formed with end region joints in which the front and rear end regions and the sheet located on the skin contact surface side are joined, and the three-dimensional structure is formed between the end region joints. The gathering sheet is erected to form the three-dimensional gather,
The absorbent body has an absorbent core containing a superabsorbent polymer, and is located in a center region in the width direction of the absorbent core and extending in the longitudinal direction, and on both left and right sides of the low stiffness region. Having a high rigidity region,
The end region joint portion formed on the three-dimensional gather forming sheet has at least an end near the crotch portion of the end region joint portion positioned on the high rigidity region of the absorbent core. An absorbent article is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the standing property of a solid gather can be ensured, without impairing the softness | flexibility with respect to the deformation | transformation which a block-shaped absorptive core has inherently.

Drawing 1 is a top view which looked at the deployment type disposable diaper which is one embodiment of the absorptive article of the present invention from the surface sheet side. FIG. 2 is an exploded perspective view of the diaper shown in FIG. FIG. 3 is a cross-sectional view taken along the line XX of the absorbent core of the diaper shown in FIG. FIG. 4 is a plan view of the absorbent core of the diaper shown in FIG. 1 as viewed from the top sheet side. FIG. 5 is a plan view (corresponding to FIG. 1) of an unfolded disposable diaper, which is another embodiment of the absorbent article of the present invention, as viewed from the top sheet side. FIG. 6 is a schematic diagram illustrating an example of an absorbent body manufacturing apparatus in the diaper illustrated in FIGS. 1 and 4. FIG. 7 is a schematic cross-sectional view along the width direction of a part (concave portion) on the outer peripheral surface side of the rotating drum shown in FIG. FIG. 8 is a schematic cross-sectional view showing a state in which a liquid-absorbing material is deposited in the concave portion of the rotating drum shown in FIG. Fig.9 (a) and (b) are top views which show another embodiment of the absorptive core in the diaper shown in FIG.

  The present invention will be described below based on preferred embodiments with reference to the drawings. FIG. 1 shows a disposable diaper according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the diaper shown in FIG. The diapers shown in these drawings are so-called unfolded disposable diapers. The diaper 10 has a longitudinal direction Y and a width direction X orthogonal thereto.

  In the following description, the “non-skin contact surface side” is the side (surface) that is disposed on the opposite side to the wearer's skin side when worn, among the front and back sides (surfaces) of each member such as the absorbent body 20. It is. The “skin contact surface side” is the side (surface) that is disposed on the skin side of the wearer when wearing, out of the front and back sides (surfaces) of each member. Further, with respect to the longitudinal direction of the diaper 10, the abdominal side A side is also referred to as “front side”, and the back side B side is also referred to as “rear side”.

  The diaper 10 includes a top sheet 21 disposed on the skin contact surface side of the wearer, a back sheet 23 disposed on the non-skin contact surface side, and a longitudinal absorption disposed between the both sheets 21 and 23. And a body 20. The top sheet 21 is made of a liquid-permeable sheet and faces the wearer's skin when the diaper 10 is worn. The back sheet 23 is made of a liquid-impermeable or water-repellent sheet and faces outward when worn.

  The diaper 10 is formed symmetrically with respect to the longitudinal center line CL extending in the longitudinal direction. The diaper 10 includes a crotch portion C located in a central region in the longitudinal direction, and a ventral side portion A and a back side portion B extending from the crotch portion C forward and backward in the longitudinal direction. The ventral portion A is arranged on the wearer's ventral side when the diaper 10 is worn. The back part B is arranged on the wearer's back side when the diaper 10 is worn. The crotch part C is arranged on the wearer's crotch when the diaper 10 is worn.

  In the diaper 10, the left and right side edges of the abdominal side A and the right and left side edges of the back side part B extend outward in the width direction from the left and right side edges of the crotch C. The left and right side edges of the crotch portion C are convexly curved inward in the width direction, and have a shape in which the central area in the longitudinal direction is constricted inward as a whole. The top sheet 21 and the back sheet 23 respectively extend outward from the left and right side edges and the front and rear end edges of the absorbent body 20. Each of the top sheet 21 and the back sheet 23 is joined to each other directly or through another member at an extending portion extending outward from the periphery of the absorbent body 20, and sandwiches and fixes the absorbent body 20. doing.

  The diaper 10 is provided with a pair of fastening tapes F, F on left and right side edges of the back side B. On the outer surface (non-skin contact surface) of the abdominal side A, that is, on the non-skin contact surface of the back sheet 23, a landing tape L for fastening the fastening tapes F and F is provided as shown in FIG. .

  A solid gather forming sheet 162 is disposed on each of both side portions along the longitudinal direction of the diaper 10. The three-dimensional gather forming sheet 162 is used to form a three-dimensional gather. The three-dimensional gather forming sheet 162 is joined to a sheet located on the skin contact surface side, for example, the top sheet 21 so that a fixed end and a free end extending in the longitudinal direction of the diaper 10 are formed in the three-dimensional gather. Further, the three-dimensional gather forming sheet 162 has a pair of front and rear ends by joining the front and rear end regions and the sheet (for example, the surface sheet 21) located on the skin contact surface side in the front and rear end regions in the longitudinal direction. Area joints 162A and 162B are formed. The end region joint 162A is located on the ventral side A of the diaper 10, and the end region joint 162B is located on the back side B. Further, the end region joint portions 162 </ b> A and 162 </ b> B are formed to extend in the longitudinal direction of the diaper 10. The end region joining portions 162A and 162B are formed by joining two sheets by a known joining means such as heat seal or adhesive.

  A solid gather elastic member 161 extending in the longitudinal direction of the diaper 10 is fixed to the free end of the solid gather in an extended state. By the contraction force of the three-dimensional gather elastic member 161, the three-dimensional gather forming sheet 162 stands up toward the wearer's body side between the end region joints 162A and 162B, thereby forming a three-dimensional gather.

  The solid gather forming sheet 162 and the back sheet 23 are joined to each other at a position outward in the width direction from the fixed end of the solid gather. That is, it joins on the outer side of the width direction of the absorber 20 (surface sheet 21). Thereby, a pair of side flaps 24 is formed. The side flaps 24 extend outward in the width direction from both side edges along the longitudinal direction of the absorbent body 20, and extend in the longitudinal direction of the diaper 10. In the side flap 24, a plurality of side flap elastic members 163 for forming leg gathers are arranged in an elongated state in a longitudinal direction at a portion substantially corresponding to the crotch portion C. The side flap elastic member 163 is sandwiched and fixed between the three-dimensional gather forming sheet 162 and the back sheet 23. Leg gathers are formed in the crotch part C of the diaper 10 by the side flap elastic member 163 contracting.

  An elastic sheet 164 for forming waist gathers is disposed at the longitudinal end of the diaper 10 on the back side B side. The elastic sheet 164 is configured by sandwiching and fixing a plurality of elastic members 165a and 165b extending in the width direction of the diaper 10 between two sheet members 164a and 164b.

  In the elastic sheet 164, of the plurality of elastic members 165a and 165b, the elastic member 165b, which is an elastic member located near the waist opening edge W, is located from a position near one side edge in the width direction of the diaper 10. , And is continuously arranged over a position near the other side edge. On the other hand, the elastic member 165a, which is an elastic member located closer to the absorber than the elastic member 165b, is disposed only on the left and right side portions in the width direction of the diaper 10, and the elastic member 165a is disposed in the center region in the width direction. Not placed. Specifically, the elastic member 165a has one end near the side edge in the width direction of the diaper 10. The other end is terminated before reaching the central region in the width direction of the diaper 10.

  The absorber 20 has a vertically long shape extending in the same direction as the longitudinal direction of the diaper 1 in plan view, and is symmetrical with respect to the longitudinal center line CL. The absorber 20 is arranged from the ventral side A to the back side B of the diaper 10. The left and right side edges of the absorbent body 20 are curved inward in the width direction at a central region in the longitudinal direction, that is, at a portion corresponding to the crotch part C in the diaper 10. The absorbent body 20 is composed of an absorbent core 22 containing a superabsorbent polymer and a covering material that wraps the absorbent core 22.

  FIG. 3 shows a cross-sectional view taken along line XX of the absorbent core 22 including the superabsorbent polymer in the absorbent body 20 shown in FIG. As shown in the figure, the absorbent core 22 has a first surface 233a and a second surface 233b. The 1st surface 233a is a skin contact surface, and has faced the surface sheet 21 or the intermediate sheet (not shown) side used as needed. The second surface 233b is the non-skin contact surface side and faces the back sheet 23 side.

  The absorbent core 22 has a relatively high basis weight and is adjacent to the high basis weight portion 234a and the high basis weight portion 234a having a convex shape protruding toward the non-skin contact surface side, and relatively relatively It has a low basis weight portion 234b that is low in amount and recessed toward the skin contact surface side. The high basis weight part 234a and the low basis weight part 234b are integrally formed. The non-skin contact surface side of the absorbent core 22 has an uneven structure, and the skin contact surface side is flat. When the non-skin contact surface side of the absorbent core 22 has an uneven structure, the absorbent core 22 is easily deformed flexibly by an external force applied to the absorbent core 22. As a result, the fit of the diaper 10 is improved. “Integrally molded” means that these parts are integrated without being separated from each other without using a bonding means such as an adhesive or heat fusion, and are integrally formed from the same material. Means that When these parts are integrally molded, the body fluid has continuity that can move smoothly. A method for manufacturing the absorbent core having such a structure will be described later.

  The absorptive core 22 is comprised from the liquid absorptive material. As the liquid-absorbing material, the same materials as those conventionally used in the technical field of absorbent articles can be used. For example, a highly absorbent polymer made of defibrated pulp or a hydrogel material can be used. The absorbent body 20 includes the absorbent core 22 covered with a liquid-permeable sheet made of tissue paper, nonwoven fabric, or the like, but the absorbent body 20 is composed of only the uncoated absorbent core 22. Also good.

  The top view which looked at the absorptive core 22 from the surface sheet 21 side is shown by FIG. As shown in FIG. 1 and FIG. 1, a plurality of low basis weight portions 234 b extend in parallel with the longitudinal direction of the absorbent core 22. A plurality of the low basis weight parts 234 b also extend in the width direction of the absorbent core 22. As a result, the low basis weight portion 234b has an orthogonal lattice shape extending in the longitudinal direction and the width direction of the absorbent core 22. And the high basic weight part 234a is located in the grating | lattice formed of the low basic weight part 234b. Therefore, each high basic weight part 234a is divided by the low basic weight part 234b, and is independent independently. The shapes of the respective high basis weight portions 234a are substantially the same, are rectangular in plan view, and the length in the longitudinal direction is larger than the length in the width direction. On the other hand, regarding the low basic weight part 234b, the low basic weight part 234b extends in the longitudinal direction and the width direction of the absorbent core 22 and is connected to each other to form a continuous body. The width of the low basis weight portion 234b extending in the longitudinal direction of the absorbent core 22 and the width of the low basis weight portion 234b extending in the width direction of the absorbent core 22 may be the same or different.

  As described above, the absorbent core 22 has a block structure including a plurality of high basis weight portions 234a having a relatively high basis weight and low basis weight portions 234b having a relatively low basis weight, and The periphery of each high basic weight part 234a is provided with the block area | region 235 which is surrounded by the low basic weight part 234b over the whole area, and is independently independent. Further, the outermost periphery of the block structure is surrounded by the low basis weight portion 234b. The corners of the low basis weight portion 234b located on the outermost periphery of the block structure are preferably rounded to draw a convex curve toward the outside.

  By having the block region 235 composed of the high basis weight portion 234a and the low basis weight portion 234b, the absorbent core 22 becomes flexible both in the longitudinal direction and in the width direction, resulting in absorbency. The core 22 is easy to follow the shape of the wearer's body. Furthermore, the excreted liquid flows while being guided by the low-thickness portion having a small thickness, whereby the diffusibility in the longitudinal direction and the width direction of the absorbent core 22 can be improved.

As for the basic weight of the low basic weight part 234b with respect to the basic weight of the high basic weight part 234a, the lower limit becomes like this. Preferably it is 20%, More preferably, it is 30%. The upper limit is preferably 80%, more preferably 70%. The lower limit of the basis weight of the high basis weight portion 234a itself is preferably 300 g / m ² , and more preferably 350 g / m ² . The upper limit is preferably 900 g / m ² , more preferably 800 g / m ² . Regarding the low basis weight part 234b, the lower limit value of the basis weight is preferably 100 g / m ² , and more preferably 150 g / m ² . The upper limit is preferably 500 g / m ² , more preferably 400 g / m ² . The basis weight is measured as follows.
Cut along the boundary line between the high basis weight portion 234a and the low basis weight portion 234b in the absorbent core 22 using a single blade razor manufactured by Feather Corporation. Ten pieces of the high basis weight portion 234a obtained by cutting were each measured using an electronic balance (Electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point), and the small piece 1 of the high basis weight portion 234a. Find the average weight of the pieces. The calculated average weight is divided by the average area per piece of the high basis weight portion 234a to calculate the basis weight of the high basis weight portion 234a. The basis weight of the non-block region 236 described later is also calculated in the same manner as the basis weight of the high basis weight portion 234a.
Next, along the boundary line extending in the longitudinal direction (Y direction) of the diaper 10 among the boundary lines between the high basis weight portion 234a and the low basis weight portion 234b, the length is 100 mm and the width is the width of the low basis weight portion 234b. In accordance with the design dimensions, five small pieces in the Y direction of the thin striped low basis weight portion 234b are cut out using a single blade razor manufactured by Feather. Each of the 5 pieces obtained was measured using an electronic balance (Electronic balance GR-300 manufactured by A & D, accuracy: 4 digits after the decimal point), and averaged to obtain the average weight of one piece of the low basis weight portion 234b. . The obtained average weight is divided by the average area per small piece in the Y direction of the low basis weight portion 234b to calculate the basis weight in the Y direction of the low basis weight portion 224b. For the X direction of the low basis weight portion 234b, the basis weight is calculated in the same manner as the Y direction of the low basis weight portion 234b.

The high basis weight part 234a not only has a larger basis weight than the low basis weight part 234b, but also has a larger thickness. The lower limit of the thickness of the low basis weight portion 234b relative to the thickness of the high basis weight portion 234a is preferably 30%, and more preferably 40%. The upper limit is preferably 90%, more preferably 80%. The lower limit of the thickness of the high basis weight portion 234a itself is preferably 2 mm, and more preferably 3 mm. The upper limit is preferably 8 mm, more preferably 7 mm. Regarding the low basis weight part 234b, the lower limit of the thickness is preferably 1.5 mm, and more preferably 2.5 mm. The upper limit is preferably 4.5 mm, and more preferably 4 mm. The method for measuring the thickness is as follows.
A sample is cut into a predetermined size, the measurement site is pressurized at 5 kPa for 10 minutes, and measurement is performed immediately after dewetting. The number of measurement points is 3 points or more including one or more of each of the abdominal side, crotch, and back side per one sheet, and the thickness is obtained by averaging two samples (6 or more measurement points). For example, the diaper 10 is cut in the longitudinal direction or the width direction of the diaper 10 with a sharp razor, and the cross section of the cut sample is measured. When it is difficult to measure with the naked eye, the section of the cut sample may be observed and measured at a magnification of 20 to 100 times using, for example, a microscope (VHX-1000 manufactured by KEYENCE).

  The block region 235 is disposed from the abdominal side A to the back side B of the absorbent core 22. The block region 235 includes an abdominal side high basis weight portion group 237A provided at a position corresponding to the abdominal side portion A and a back side high basis weight portion group 237B provided at a position corresponding to the back side portion B. And a crotch part high basis weight part group 237C provided at a position corresponding to the crotch part C. Each high basic weight part group is connected. In each high basic weight part group, the number of the high basic weight parts 234a arrange | positioned along the width direction differs. Specifically, the number of high basis weight portions 234a in the abdominal portion high basis weight portion group 237A and the back side high basis weight portion group 237B is the number of the high basis weight portions 234a in the crotch high basis weight portion group 237C. More than the number of arrangements. For example, as shown in FIG. 4, in the abdominal side high basis weight part group 237A and the back side high basis weight part group 237B, the number of high basis weight parts 234a arranged along the width direction is five. On the other hand, in the crotch high basis weight part group 237C, the number of the high basis weight parts 234a arranged along the width direction is three. In this embodiment, since the dimension of the high basic weight part 234a is the same in each high basic weight part group, the high basic weight part in the abdominal part high basic weight part group 237A and the back side high basic weight part group 237C. That the number of the arrangement of 234a is larger than the number of the arrangement of the high basis weight parts 234a in the crotch lower high basis weight part group 237B, that is, the ventral side part A and the back are larger than the width of the block region 235 in the crotch part C. This means that the width of the block region 235 in the side portion B is larger.

  A non-block region 236 is disposed on the outer side in the longitudinal direction and the outer side in the width direction of the block region 235 in the absorbent core 22. That is, the absorptive core 22 is composed of a block region 235 composed of a high basis weight portion 234a and a low basis weight portion 234b, and a non-block region 236. The non-block region 236 surrounds the outer periphery of the block region 235 over the entire area. The block area 235 and the non-block area 236 are partitioned by a low basis weight portion 234b located on the outermost periphery of the block area 235. In the non-blocking region 236, the thickness and basis weight at any position are constant.

  As shown in FIG. 3, in the present embodiment, the thickness of the non-block region 236 is substantially the same as the thickness of the high basis weight portion 234 a of the block region 235. However, the relationship between the thickness of the non-blocking region 236 and the thickness of the high basis weight portion 234a is not limited to this, and the thickness of the non-blocking region 236 may be larger, and conversely the thickness of the high basis weight portion 234a. May be large. Specifically, the lower limit of the thickness of the non-blocking region 236 is preferably 2 mm, and more preferably 3 mm. The upper limit is preferably 8 mm, more preferably 7 mm. The method for measuring the thickness is as described above.

  The high basis weight portion 234a and the low basis weight portion 234b of the block region 235 are integrally formed as described above. In addition to this, a block region 235 composed of a high basis weight portion 234a and a low basis weight portion 234b and a non-block region 236 located on the outer periphery thereof are also integrally formed. The meaning of integral molding is as described above.

  As described above, the absorbent core 22 is formed with the block region 235 and the non-block region 236. The block region 235 is made of a high basis weight portion 234a and a low basis weight portion 234b and soft, whereas the non-block region 236 has a constant thickness and basis weight and is hard. Is a low-rigidity region having relatively low rigidity relative to the non-blocking region 236. In other words, the non-blocking region 236 is a high-rigidity region that is relatively rigid with respect to the block region 235. Therefore, the low rigidity region in the absorbent core 22 is located in the center region in the width direction of the absorbent core 22 and extends in the longitudinal direction. On the other hand, the high rigidity region is located on both the left and right sides of the low rigidity region. The rigidity referred to here is the degree of difficulty in bending the absorbent core, and high rigidity means that the absorbent core is difficult to bend. The degree of rigidity can be measured by, for example, the value of bending moment (gf · cm) at 15 ° bending measured using a Taber stiffness tester (part number 2048-D) manufactured by Kumagai Riki Kogyo Co., Ltd. . When this value is large, it can be said that the rigidity is high.

  In order to raise the three-dimensional gather, the pair of front and rear end region joints 162A and 162B is formed on the three-dimensional gather forming sheet 162 as described above. And the whole region distribute | arranged on the absorptive core among this edge part area junction part 162A, 162B is located on the non-blocking area | region 236 mentioned above, ie, the highly rigid area | region of the absorptive core 22. FIG. The end region joints 162A and 162B are positions that serve as starting points of contraction force generated in the three-dimensional gather elastic member 161 provided in the three-dimensional gather, and the end region joints 162A and 162B have high rigidity of the absorbent core 22. By being positioned on the region, the contraction force of the three-dimensional gather elastic member 161 surely acts on the three-dimensional gather. As a result, the standing property of the three-dimensional gather is improved.

  In order to prevent the contraction force of the three-dimensional gather elastic member 161 from acting on the low rigidity region of the absorbent core, at least the end portion near the crotch portion C of the end region joint portions 162A and 162B is the absorbent core. It suffices to be located on the high-rigidity region. Furthermore, when it is desired to further ensure the uprightness of the three-dimensional gather, the entire region arranged on the absorbent core among the end region joints 162A and 162B is located on the high rigidity region of the absorbent core. It is advantageous. In addition, one of the pair of front and rear end region joints 162A and 162B, in particular, the end near the crotch C in the end region joint 162B of the back side B is on the highly rigid region of the absorbent core. If the three-dimensional gathers are positioned, the solid gathers are surely raised. However, if the solid gathers are to be raised more reliably, the front and rear end region joints 162A and 162B are close to the crotch C. It is advantageous for the end of this to be located on a highly rigid region of the absorbent core.

  In order to make the contraction force of the three-dimensional gathered elastic member 161 act on the three-dimensional gather more reliably, the fixed length of the three-dimensional gathered elastic member 161 is 80% of the distance between the pair of front and rear end region joints 162A and 162B. Preferably, it is more than 85% or more. The upper limit of this value is preferably 100%, and more preferably 95%. The distance between the end region joints 162A and 162B is the distance between the end portions near the crotch C in the end region joints 162A and 162B. The fixed length of the three-dimensional gathered elastic member 161 is the length of the part where the three-dimensional gathered elastic member 161 is fixed to the free end of the three-dimensional gather forming sheet 162. Therefore, when the solid gather elastic member 161 is fixed to the solid gather forming sheet 162 over its entire length, the full length and the fixed length of the solid gather elastic member 161 coincide. On the other hand, when only a part of the three-dimensional gather elastic member 161 is fixed to the three-dimensional gather forming sheet 162, the fixed length is shorter than the total length of the three-dimensional gather elastic member 161.

  As another means for causing the shrinkage force of the solid gather elastic member 161 to act on the solid gather more reliably, the high rigidity region of the absorbent core 22 is continuously connected between the pair of front and rear end region joints 162A and 162B. It is preferable to adopt an extended configuration. In the present embodiment, as shown in FIG. 1, the non-block region 236 that is a high-rigidity region is positioned so as to surround the entire outer periphery of the block region 235, so that the high-rigidity region is a pair of front and rear end regions. In this state, the joint portions 162A and 162B are continuously extended. By adopting this configuration, when the three-dimensional gathered elastic member 161 contracts, the continuous high-rigidity area resists the contracting force of the three-dimensional gathered elastic member 161, so that the absorbent core 22 is not bent excessively. It becomes difficult to occur and the standing property of the three-dimensional gather becomes more certain. When this configuration is adopted, the high-rigidity region extending between the pair of front and rear end region joints 162A and 162B extends linearly, and the position of the three-dimensional gathered elastic member 161 in the unfolded diaper 10 They may be in the same position (see FIG. 5 described later). Alternatively, as in the present embodiment, the high-rigidity region extends inwardly in the crotch part C and extends in a curved manner, and partly in the three-dimensional gathered elastic member 161 in the unfolded diaper 10 (for example, the ventral side A and the back It may be in the same position (in side B).

  By adjusting the ratio of the area of the high basis weight part 234a and the area of the low basis weight part 234b in the absorbent core 22, the contraction force of the three-dimensional gathered elastic member 161 is made to act on the three-dimensional gather reliably and the diaper 10 The fit can be made compatible. Specifically, the ratio of the area of the high basis weight part 234a and the area of the low basis weight part 234b is preferably 6: 4 to 9: 1, and more preferably 7: 3 to 8: 2. .

  FIG. 5 shows an unfolded disposable diaper as another embodiment of the absorbent article of the present invention. The diaper 10 shown in the figure is different from the diaper of the embodiment described above in the shape of the absorbent core 22. Also in the diaper 10 shown in the figure, the absorbent core 22 includes a low-rigidity region made up of a block region 235 and a high-rigidity region made up of a non-blocking region 236. The non-block region 236 surrounds the entire outer periphery of the block region 235 as in the above-described embodiment. However, the shape of the block region 235 is different from the embodiment described above. In the present embodiment, abdominal side high basis weight portion group 237A provided at a position corresponding to ventral side portion A and a back side high basis weight portion group 237B provided at a position corresponding to back side portion B. The number of high basis weight portions 234a arranged along the width direction is the same in the crotch lower high basis weight portion group 237C provided at a position corresponding to the crotch portion C. Therefore, the block region 235 extends from the ventral side A to the back side B with the same width. In the block region 235 in the absorbent core of the above-described embodiment, the width of the crotch portion C is narrower than the width of the ventral portion A and the back portion B as shown in FIG.

  In the diaper 10 of the present embodiment, the high-rigid region extending between the pair of front and rear end region joints 162A and 162B, that is, the non-blocking region 236 extends linearly and is in the unfolded state of the diaper 10. The three-dimensional gather elastic member 161 is located at the same position as the three-dimensional gather elastic member 161 over the entire length thereof. By adopting this configuration, the standing property of the three-dimensional gather is further ensured.

  In addition, regarding the present embodiment, the description regarding the embodiment shown in FIGS.

  Next, the suitable manufacturing method of the absorptive core 22 of the diaper 10 of each embodiment mentioned above is demonstrated. FIG. 6 shows an embodiment of a method for manufacturing the absorbent core 22 and a manufacturing apparatus used therefor. In the following description, the absorbent core is denoted by reference numeral 41. The manufacturing apparatus for the absorbent core 41 supplies the rotating drum 50 that is rotationally driven in the direction of the arrow R1 and the liquid-absorbing material 45 that includes the superabsorbent polymer that is the raw material of the absorbent core 41 on the outer peripheral surface of the rotating drum 50 And a transfer roll 70 that is disposed obliquely below and downstream of the rotary drum 50 and is driven to rotate in the direction of the arrow R2, and is disposed between the duct 60 and the transfer roll 70 in the circumferential direction of the rotary drum 50. A vacuum box 65, a mesh belt 75, which is a sheet-like air-permeable member, disposed between the vacuum box 65 and the rotary drum 50 and between the transfer roll 70 and the rotary drum 50, and a transfer roll And a vacuum conveyor 80 disposed below the 70.

  As shown in FIG. 6, the rotating drum 50 has a cylindrical shape, and receives power from a prime mover such as a motor, so that members forming the outer peripheral surface rotate around a horizontal axis. A space 56 capable of depressurizing the inside is formed in a non-rotating portion inside the rotating drum 50 (on the rotating shaft side). A known exhaust device (not shown) such as an intake fan is connected to the space 56, and the interior of the space 56 can be maintained at a negative pressure by operating the exhaust device. On the other hand, piping (not shown) capable of taking in air outside the apparatus is connected to the spaces 57 and 58 on the inner side (rotating shaft side) of the rotating drum 50.

  As shown in FIG. 6, a plurality of drum recesses 51 having a shape corresponding to the shape of the absorbent core 41 to be manufactured are formed on the outer peripheral surface of the rotating drum 50 at equal intervals in the R1 direction. As shown in FIG. 7, a mesh plate 52 having a large number of pores and a metal or resin impermeable member 53 are disposed on the bottom surface of each drum recess 51. Here, the air-impermeable member 53 is provided so as to protrude on the mesh plate 52, and is disposed so as to correspond to the shape and position of the low basis weight portion 234b described above. As shown in FIG. 7, the region 54 composed only of the mesh plate 52 partitioned by the air-impermeable member 53 arranged in this way becomes a portion corresponding to the high basis weight portion 234 a and is partitioned by the air-impermeable member 53. A region 55 consisting only of the mesh plate 52 in the entire outer periphery of the portion becomes a portion corresponding to the non-block portion 236. Moreover, the part of the outer peripheral surface of the rotating drum 50 in which the drum recessed part 51 is not formed consists of the frame body of the rotating drum 50 which consists of metal rigid bodies, and is non-breathable.

  As shown in FIG. 6, one end side of the duct 60 covers the outer peripheral surface of the rotary drum 50 positioned on the space 56 maintained at a negative pressure, and a fiber material introducing device is provided on the other end side (not shown). Have. The fiber material introducing device includes, for example, a pulverizer that pulverizes sheet-like wood pulp into defibrated pulp, and sends the defibrated pulp (fiber material) into the duct. A superabsorbent polymer introduction part to be introduced is provided.

  The transfer roll 70 has a cylindrical outer peripheral portion having air permeability, and the outer peripheral portion rotates in the R2 direction upon receiving power from a prime mover such as a motor. In the non-rotating portion on the inner side (rotating shaft side) of the transfer roll 70, a space 71 that can be depressurized is formed. A known exhaust device (not shown) such as an intake fan is connected to the space 71, and the interior of the space 71 can be maintained at a negative pressure by operating the exhaust device.

  The vacuum box 65 is disposed between the downstream end 61 of the duct 60 and the transfer roll 70 in the rotation direction R1 of the rotary drum 50. The vacuum box 65 has a box-like shape and has an opening that opens in the direction of the rotating drum 50 at a portion facing the rotating drum 50. The vacuum box 65 is connected to a known exhaust device (not shown) such as an intake fan via an exhaust pipe 67, and the inside of the vacuum box 65 can be maintained at a negative pressure by the operation of the exhaust device. .

  The mesh belt 75 is a belt-shaped breathable belt having a mesh connected endlessly, and is continuously guided along a plurality of free rolls and transfer rolls 70 to move along a predetermined path. The mesh belt 75 is driven by the rotation of the transfer roll 70. While the mesh belt 75 passes in front of the opening of the vacuum box 65, the mesh belt 75 is in contact with the outer peripheral surface of the rotary drum 50, and the transfer roll 70 and the rotary drum 50 are closest to each other. In the vicinity of the portion, the transfer drum 70 moves away from the outer peripheral surface of the rotating drum 50.

  The vacuum conveyor 80 includes an endless breathable belt 83 that is stretched between the drive roll 81 and the driven roll 82, and a vacuum box 84 that is disposed at a position facing the transfer roll 70 with the breathable belt 83 interposed therebetween. ing.

  Next, a method for continuously manufacturing the absorbent core using the above-described absorbent core manufacturing apparatus will be described. First, the exhaust device connected to each of the space 56 in the rotary drum 50 and the vacuum box 65 is operated to make negative pressure. This is because such a negative pressure in the space 56 causes an air flow in the duct 60 to convey the liquid absorbent material 45 to the outer peripheral surface of the rotary drum 50. Next, the rotating drum 50 and the transfer roll 70 are rotated, and the vacuum conveyor 80 is operated. When the fiber material introducing device is operated to supply the fiber material and the superabsorbent polymer into the duct 60, the liquid absorbent material 45 rides on the air flow flowing through the duct 60 and is in a scattered state. It is supplied toward the outer peripheral surface of the rotating drum 50.

  While the portion covered with the duct 60 is being conveyed, the liquid absorbent material (mixture of fiber material and superabsorbent polymer) 45 is sucked into the drum recess 51 of the rotary drum 50. As shown in FIG. 8, the liquid absorbing material 45 is gradually deposited on the mesh plate 52 in each region 54 and region 55 of the drum recess 51. In the deposit 46 obtained in this way, a portion (a portion corresponding to the non-breathable member 53) 46a where the liquid-absorbing material 45 is deposited on the non-breathable member 53 is relatively deposited. The other part (corresponding to the region 54) 46b and the part (corresponding to the region 55) 46c have a relatively large deposition amount of the liquid-absorbing material 45, and the deposit 46 as a whole has an uneven structure. become.

  Then, when the rotary drum 50 rotates and the drum concave portion 51 comes to the position opposite to the vacuum box 65, the deposit 46 in the drum concave portion 51 is sucked to the mesh belt 75 by the suction from the vacuum box 65. It becomes. In this state, the deposit 46 in the drum recess 51 is conveyed to a position immediately before the closest portion between the transfer roll 70 and the rotary drum 50, and is sucked from the transfer roll 70 side in the vicinity of the closest portion to the mesh belt. The mold is released from the drum recess 51 while being sucked by 75 and moved onto the transfer roll 70.

  In this way, the deposit 46 having the concavo-convex structure transferred onto the transfer roll 70 together with the mesh belt 75 is adsorbed to the mesh belt 75 on the transfer roll 70 and is transferred to the vacuum conveyor 80 (the lowermost end of the transfer roll 70). And is transferred to the vacuum conveyor 80 by suction by the vacuum box 84 at the delivery section.

  The long deposit 46 thus obtained is cut at a predetermined interval to continuously produce the absorbent core precursor 49 cut into the size of one absorbent core. Subsequently, the absorptive core precursor 49 is compressed by the pressurization means 90, and the thickness of the deposit 46 which comprises the absorptive core precursor 49 is positively reduced, and the target absorptive core 41 is obtained. As shown in FIG. 6, the pressurizing means 90 includes rolls 91 and 92 having at least one smooth surface, and the object to be pressed introduced between the rolls 91 and 92 can be pressed from above and below to be compressed in the thickness direction. It is configured.

  When the absorbent core precursor 49 is compressed by the pressurizing means 90, the portion (region 54 corresponding portion) 46b and the portion (region 55 corresponding portion) 46c having a relatively large liquid absorbing material and a large thickness are formed in the liquid absorbing material. It is compressed more strongly than a portion (a portion corresponding to the non-breathable member 53) 46a having a relatively small 45 and a small thickness. As a result, in the absorbent core manufactured using the manufacturing apparatus described above, the portion (region 54 corresponding portion) 46b (convex portion) and the portion (region 55 corresponding portion) 46c of the deposit 46 are the absorbent core 41. In the absorbent core 41, the portion (the portion corresponding to the breathable member 53) 46a (concave portion) in the deposit 46 has a relatively low density. It becomes the low basis weight part 234b.

  9A and 9B show another embodiment of the absorbent core 22 used in the diaper 10 of the present embodiment. Absorbent cores 22A and 22B shown in FIGS. 9 (a) and 9 (b) have a relatively high basis weight and protrude toward the non-skin contact surface side, similarly to absorbent core 22 shown in FIG. A block structure comprising a high basis weight portion 234a having a shape of a low basis weight portion 234b adjacent to the high basis weight portion 234a and having a relatively low basis weight and recessed toward the skin contact surface side. doing. The high basis weight part 234a and the low basis weight part 234b are integrally formed. The non-skin contact surface side of the absorbent core 22 has an uneven structure, and the skin contact surface side is flat.

  A non-block region 236 is disposed on the outer side in the longitudinal direction and the outer side in the width direction of the block region in the absorbent cores 22A and 22B. That is, the absorbent cores 22 </ b> A and 22 </ b> B are configured by a block region including the high basis weight portion 234 a and the low basis weight portion 234 b and the non-block region 236. The non-block region 236 surrounds the entire periphery of the block region.

  The block regions in the absorbent cores 22A and 22B are arranged from the abdominal side A to the back side B. The block area includes abdominal side high basis weight portion group 237A provided at a position corresponding to the ventral side portion A, and a back side high basis weight portion group 237B provided at a position corresponding to the back side portion B. And crotch part high basis weight part group 237C provided in a position corresponding to crotch part C. Each high basic weight part group is connected. The number of high basis weight parts 234a in the ventral side high basis weight part group 237A and the back side high basis weight part group 237B is more than the number of high basis weight parts 234a in the crotch high basis weight part group 237C. Has also increased. In the embodiment shown in FIG. 9A, in the abdominal side high basis weight part group 237A and the back side high basis weight part group 237B, the number of high basis weight parts 234a arranged along the width direction is five. In contrast, in the crotch high basis weight portion group 237C, the number of high basis weight portions 234a arranged along the width direction is three. In the embodiment shown in FIG. 9B, in the abdominal side high basis weight part group 237A and the back side high basis weight part group 237B, the number of high basis weight parts 234a arranged along the width direction is 6. In contrast, in the crotch high basis weight portion group 237C, the number of high basis weight portions 234a arranged along the width direction is two. Thus, as for the absorptive core 22A, 22B of each embodiment, the width of the block area in the abdominal part A and the back part B is larger than the width of the block area in the crotch part C. . Even when these absorbent cores 22A and 22B are used, the same advantageous effects as those obtained when the absorbent core 22 shown in FIG. 1 is used are produced.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, the range of this invention is not restrict | limited to the said embodiment. For example, in each of the embodiments described above, the block portion 235 formed in the absorbent core 22 is used as the low-rigidity region and the non-blocking region 236 is used as the high-rigidity region. In addition, a high rigidity region can be realized. For example, as a low-rigidity area, a part having a certain thickness, a basis weight lower than that of the high-rigidity area, and a lower bulk density is used. A portion having a thickness of 2 mm, a basis weight higher than that of the low-rigidity region, and a higher bulk density may be used.

  Moreover, although each said embodiment is an example which applied the absorbent article of this invention to the deployment type disposable diaper, this invention is absorbent articles other than a deployment type disposable diaper, for example, an underpants type absorbent article etc. It can be similarly applied to.

  Further, in each of the above embodiments, the block region 235 in the absorbent core 22 has a flat skin contact surface side, and the non-skin contact surface side is uneven. The non-skin contact surface side may be flat and the skin contact surface side may be uneven.

This invention discloses the following absorbent articles further regarding embodiment mentioned above.
<1>
A three-dimensional gather that includes a top sheet, a back sheet, and an absorbent body disposed between the top sheet and the back sheet, and a three-dimensional gather forming sheet that is disposed on both sides along the longitudinal direction, and extends in the longitudinal direction. An absorbent article being formed,
The three-dimensional gather forming sheet is joined to a sheet located on the skin contact surface side so that a fixed end and a free end extending in the longitudinal direction are formed on the three-dimensional gather, and the three-dimensional gather forming sheet The front and rear end regions are formed with end region joints in which the front and rear end regions and the sheet located on the skin contact surface side are joined, and the three-dimensional structure is formed between the end region joints. The gathering sheet is erected to form the three-dimensional gather,
The absorbent body has an absorbent core containing a superabsorbent polymer, and is located in a center region in the width direction of the absorbent core and extending in the longitudinal direction, and on both left and right sides of the low stiffness region. Having a high rigidity region,
The end region joint portion formed on the three-dimensional gather forming sheet has at least an end near the crotch portion of the end region joint portion positioned on the high rigidity region of the absorbent core. Absorbent article.

<2>
An elastic member is fixed to the free end of the three-dimensional gather in an extended state, and the fixed length of the elastic member is 80 of the distance between the end region joint portions formed on the three-dimensional gather forming sheet. The absorbent article according to <1>, which is ˜100%.
<3>
The absorbent article as described in <1> or <2> in which the highly rigid area | region of the said absorptive core is extended between the said edge part area junction parts formed in the said sheet | seat for solid gathers formation.
<4>
The absorbent article according to any one of <1> to <3>, wherein the outer periphery of the low-rigidity region of the absorbent core is surrounded by the high-rigidity region.

<5>
The low rigidity region of the absorbent core consists of a block region, the high rigidity region of the absorbent core consists of a non-block region,
The block region has a block structure composed of a plurality of high basis weight parts having a relatively high basis weight and a low basis weight part having a relatively low basis weight, and the periphery of each high basis weight part is the entire area. Individually surrounded by the low basis weight part,
The absorbent article according to any one of <1> to <4>, wherein the non-block region has a constant thickness and basis weight.
<6>
The absorbent article as described in <5> whose ratio of the area of the said high basic weight part of the said block area | region and the said low basic weight part is 6: 4-9: 1.

<7>
The article comprises a crotch part located in a central region in the longitudinal direction, and a ventral part and a dorsal part extending from the crotch part in the longitudinal direction forward and backward, respectively,
In the article, the left and right side edges of the abdominal side and the left and right side edges of the back side respectively extend outward in the width direction from the left and right side edges of the crotch part,
The left and right side edges of the crotch are convexly curved inward in the width direction, and have a shape in which the central area in the longitudinal direction is constricted inward as a whole.
The absorbent article according to any one of <1> to <6>, wherein the top sheet and the back sheet respectively extend outward from left and right side edges and front and rear side edges of the absorbent core.
<8>
In the position outside the width direction from the fixed end of the three-dimensional gather, the three-dimensional gather forming sheet and the back sheet are joined together, thereby forming a pair of side flaps,
The absorption according to any one of <1> to <7>, wherein the side flaps extend outward in the width direction from both side edges along the longitudinal direction of the absorbent core and extend in the longitudinal direction of the article. Sex goods.

<9>
The article comprises a crotch part located in a central region in the longitudinal direction, and a ventral part and a dorsal part extending from the crotch part in the longitudinal direction forward and backward, respectively,
In the side flap, a plurality of side flap elastic members for forming leg gathers are arranged in a longitudinally extending state in a portion substantially corresponding to the crotch part,
The side flap elastic member is sandwiched and fixed between the sheet for forming a three-dimensional gather and the back sheet, and leg gathers are formed on the article by contracting the side flap elastic member <1. The absorbent article according to any one of> to <8>.
<10>
An elastic sheet for forming waist gathers is disposed at the longitudinal direction end of the article on the back side,
<1> to <9>, wherein the elastic sheet is configured by sandwiching and fixing a plurality of elastic members extending in the width direction of the article between two sheet members in an expanded state. The absorbent article as described.

<11>
In the elastic sheet, among the plurality of elastic members, the elastic member located near the waist opening edge is near the other side edge portion from the position near one side edge portion in the width direction of the article. It is arranged continuously over the positions.
The elastic members positioned closer to the absorbent core than the elastic members positioned closer to the waist opening edge are disposed only on the left and right sides in the width direction of the article, and the elastic region is located in the center area in the width direction. The absorbent article according to any one of <1> to <10>, wherein no member is disposed.
<12>
The article comprises a crotch part located in a central region in the longitudinal direction, and a ventral part and a dorsal part extending from the crotch part in the longitudinal direction forward and backward, respectively,
The absorbent core has a vertically long shape extending in the same direction as the longitudinal direction of the article in plan view, and is symmetrical with respect to the longitudinal center line;
The absorbent core is disposed from the ventral side to the back side of the article,
The absorbent article according to any one of <1> to <11>, wherein the left and right side edges of the absorbent core are curved inward in the width direction in a central region in the longitudinal direction.

<13>
The low rigidity region of the absorbent core consists of a block region, the high rigidity region of the absorbent core consists of a non-block region,
The block region has a block structure composed of a plurality of high basis weight parts having a relatively high basis weight and a low basis weight part having a relatively low basis weight.
The absorbent article according to any one of <1> to <12>, wherein the high basis weight part and the low basis weight part are integrally formed.
<14>
The low rigidity region of the absorbent core consists of a block region, the high rigidity region of the absorbent core consists of a non-block region,
The block region has a block structure composed of a plurality of high basis weight parts having a relatively high basis weight and a low basis weight part having a relatively low basis weight.
Any one of <1> to <13> in which the shapes of the respective high basis weight portions are substantially the same, are rectangular in plan view, and the length in the longitudinal direction is larger than the length in the width direction 2. The absorbent article according to 1.

<15>
The low rigidity region of the absorbent core consists of a block region, the high rigidity region of the absorbent core consists of a non-block region,
The block region has a block structure composed of a plurality of high basis weight parts having a relatively high basis weight and a low basis weight part having a relatively low basis weight.
The absorbent article according to any one of <1> to <14>, wherein the low basis weight portions are connected to each other by extending in the longitudinal direction and the width direction of the absorbent core.
<16>
The absorbent article according to <15>, wherein corners of the low basis weight portion located on the outermost periphery of the block structure are rounded to draw a convex curve toward the outside.

<17>
The low rigidity region of the absorbent core consists of a block region, the high rigidity region of the absorbent core consists of a non-block region,
The block region has a block structure composed of a plurality of high basis weight parts having a relatively high basis weight and a low basis weight part having a relatively low basis weight.
The basis weight of the low basis weight part relative to the basis weight of the high basis weight part is the absorbent article according to any one of <1> to <16>, whose lower limit is 20%.
<18>
The basis weight of the low basis weight part relative to the basis weight of the high basis weight part is the absorbent article according to <17>, whose lower limit is 30%.

<19>
The low rigidity region of the absorbent core consists of a block region, the high rigidity region of the absorbent core consists of a non-block region,
The block region has a block structure composed of a plurality of high basis weight parts having a relatively high basis weight and a low basis weight part having a relatively low basis weight.
The basis weight of the low basis weight part relative to the basis weight of the high basis weight part is the absorbent article according to any one of <1> to <18>, wherein an upper limit value is 80%.
<20>
As for the basic weight of the said low basic weight part with respect to the basic weight of the said high basic weight part, the upper limit is the absorbent article as described in <19> which is 70%.

<21>
The low rigidity region of the absorbent core consists of a block region, the high rigidity region of the absorbent core consists of a non-block region,
The block region has a block structure composed of a plurality of high basis weight parts having a relatively high basis weight and a low basis weight part having a relatively low basis weight.
The absorbent article according to any one of <1> to <20>, wherein the high basis weight part has a thickness larger than that of the low basis weight part.
<22>
The thickness of the low basic weight part with respect to the thickness of the said high basic weight part is an absorbent article as described in <21> whose lower limit is 30%.
<23>
The thickness of the low basic weight part with respect to the thickness of the said high basic weight part is an absorbent article as described in <22> whose lower limit is 40%.
<24>
The thickness of the low basic weight part with respect to the thickness of the high basic weight part is the absorbent article according to any one of <21> to <23>, whose upper limit is 90%.
<25>
The thickness of the low basic weight part with respect to the thickness of the said high basic weight part is an absorbent article as described in <24> whose upper limit is 80%.

<26>
An elastic member is fixed in an extended state to the free end of the three-dimensional gather,
The absorbent article according to any one of <1> to <25>, wherein a fixed length of the elastic member is 80% or more of a distance between the pair of front and rear end region joints.
<27>
The absorbent article according to <26>, wherein a fixed length of the elastic member is 85% or more of a distance between the pair of front and rear end region joints.
<28>
The absorbent article according to <26> or <27>, wherein the fixed length of the elastic member is 100% of the distance between the pair of front and rear end region joints.
<29>
The absorbent article according to <28>, wherein a fixed length of the elastic member is 95% or less of a distance between the pair of front and rear end region joints.

<30>
The absorbent article according to any one of <1> to <29>, wherein the high-rigidity region of the absorbent core continuously extends between the pair of front and rear end region joints.
<31>
An elastic member is fixed in an extended state to the free end of the three-dimensional gather,
Any one of <1> to <30>, wherein the high-rigidity region extends in an inwardly curving manner in the crotch part and is partially in the same position as the elastic member of the article in the expanded state The absorbent article as described.

<32>
The low rigidity region of the absorbent core consists of a block region, the high rigidity region of the absorbent core consists of a non-block region,
The block region has a block structure composed of a plurality of high basis weight parts having a relatively high basis weight and a low basis weight part having a relatively low basis weight.
In the absorbent core, an abdominal side high basis weight part group provided at a position corresponding to the abdominal side part, and a back side high basis weight part group provided at a position corresponding to the back side part, In the crotch high basis weight part group provided at a position corresponding to the crotch part, the number of the high basis weight parts arranged along the width direction is the same,
The absorbent article according to any one of <1> to <31>, wherein the block region extends with the same width from the abdominal side to the back side.

<33>
An elastic member is fixed in an extended state to the free end of the three-dimensional gather,
The high-rigidity region extending between the pair of front and rear end region joints extends linearly and is in the same position as the position of the elastic member over the entire length of the elastic member in the unfolded article < The absorbent article according to any one of 1> to <32>.
<34>
The absorbent article according to any one of <1> to <33>, which is a deployable disposable diaper.
<35>
The absorbent article according to any one of <1> to <33>, which is a pants-type disposable diaper.

DESCRIPTION OF SYMBOLS 10 Disposable diaper 20 Absorber 21 Top sheet 22 Absorbent core 23 Back sheet 234a High basis weight part 234b Low basis weight part 235 Block area 236 Non-block area 237A Abdominal side high basis weight part group 237B Dorsal side high basis weight part Group 237C Inseam high basis weight part group 24 Side flap 161 Three-dimensional gather elastic member 162 Three-dimensional gather forming sheet 162A, 162B End region joint part 163 Side flap elastic member

Claims (6)

A three-dimensional gather that includes a top sheet, a back sheet, and an absorbent body disposed between the top sheet and the back sheet, and a three-dimensional gather forming sheet that is disposed on both sides along the longitudinal direction, and extends in the longitudinal direction. An absorbent article being formed,
The three-dimensional gather forming sheet is joined to a sheet located on the skin contact surface side so that a fixed end and a free end extending in the longitudinal direction are formed on the three-dimensional gather, and the three-dimensional gather forming sheet The front and rear end regions are formed with end region joints in which the front and rear end regions and the sheet located on the skin contact surface side are joined, and the three-dimensional structure is formed between the end region joints. The gathering sheet is erected to form the three-dimensional gather,
The absorbent body has an absorbent core containing a superabsorbent polymer, and is located in a center region in the width direction of the absorbent core and extending in the longitudinal direction, and on both left and right sides of the low stiffness region. Having a high rigidity region,
The end region joint portion formed on the three-dimensional gather forming sheet has at least an end near the crotch portion of the end region joint portion positioned on the high rigidity region of the absorbent core. Absorbent article.   An elastic member is fixed to the free end of the three-dimensional gather in an extended state, and the fixed length of the elastic member is 80 of the distance between the end region joint portions formed on the three-dimensional gather forming sheet. The absorbent article according to claim 1, which is -100%.   The absorptive article according to claim 1 or 2 in which the high rigidity field of said absorptive core extends between said edge part joined parts formed in said sheet for solid gathers formation.   The absorbent article according to any one of claims 1 to 3, wherein the low-rigidity region of the absorbent core is surrounded by the high-rigidity region over the entire outer periphery. The low rigidity region of the absorbent core consists of a block region, the high rigidity region of the absorbent core consists of a non-block region,
The block region has a block structure composed of a plurality of high basis weight parts having a relatively high basis weight and a low basis weight part having a relatively low basis weight, and the periphery of each high basis weight part is the entire area. Individually surrounded by the low basis weight part,
The absorbent article according to any one of claims 1 to 4, wherein the non-block region has a constant thickness and basis weight.   The absorptive article according to claim 5 whose ratio of the area of said high basic weight part of said block field and said low basic weight part is 6: 4-9: 1.

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