CN111885987A

CN111885987A - Absorbent body for absorbent article

Info

Publication number: CN111885987A
Application number: CN201880091556.2A
Authority: CN
Inventors: 宇田匡志; 田房弘光
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2018-05-16
Filing date: 2018-05-16
Publication date: 2020-11-03
Anticipated expiration: 2038-05-16
Also published as: WO2019220568A1; JPWO2019220568A1; JP7050909B2; CN111885987B

Abstract

Provided is an absorbent body for an absorbent article, which can exhibit desired air permeability and ease of deformation by maintaining the shape of an opening in a worn state. An absorbent body (13) for an absorbent article (10, 80) has an absorbent core (20) including a plurality of openings (40) that substantially penetrate in the thickness direction. The opening (40) of the absorbent core (20) has a 1 st opening (41) and a 2 nd opening (42) arranged at a distance from the 1 st opening (41) in the 1 st direction (K1), and the long fibers (30) have a 1 st fiber (31) located around the 1 st opening (41) and a 2 nd fiber (32) located around the 2 nd opening (42) on at least one of the 1 st surface and the 2 nd surface. The 1 st long fibers (31) and the 2 nd long fibers (32) are directly crossed with each other or indirectly crossed with each other through other long fibers.

Description

Absorbent body for absorbent article

Technical Field

The present invention relates to an absorbent body for an absorbent article such as a sanitary napkin or a disposable diaper.

Background

Conventionally, an absorbent body for an absorbent article is known. For example, patent document 1 discloses an absorbent body including an absorbent core that is coated with a liquid-permeable sheet and shaped into a desired shape, the absorbent core including (cellulose-based) absorbent fibers such as pulp fibers and superabsorbent polymer particles.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2002-35036 (P2002-35036A)

Disclosure of Invention

Problems to be solved by the invention

The absorbent body disclosed in patent document 1 is relatively thin and has a plurality of openings penetrating the liquid-absorbent core in the thickness direction, and therefore has suitable air permeability and excellent flexibility, and can be deformed and fitted along the shape of the wearer's body in the worn state.

However, if the leg portion is moved in a state where the absorbent body is pressed between the groin portions of the wearer, the shape of the peripheral edge portion of the opening may be deformed to close the opening. When the opening is closed in the worn state, the wearer may feel uncomfortable or the air permeability and the body conformability may be reduced. In the case where the absorbent body is thickened or the opening ratios of the plurality of openings are decreased in order to avoid this, desired air permeability and ease of deformation cannot be exhibited in the same manner.

The present invention is an improvement of an absorbent body for a conventional absorbent article, and an object thereof is to provide an absorbent body for an absorbent article which can maintain the shape of an opening in a worn state and can exhibit desired air permeability and ease of deformation.

Means for solving the problems

In order to solve the above problem, the present invention relates to an absorbent body for an absorbent article.

An absorbent body for an absorbent article according to the present invention is characterized by comprising: an absorbent core having a 1 st face and a 2 nd face opposed to each other in a thickness direction; and a plurality of openings penetrating the absorbent core in the thickness direction, the absorbent core including water-absorbent fibers and long fibers longer than the water-absorbent fibers, the openings having a 1 st opening and a 2 nd opening arranged at a distance from the 1 st opening in the 1 st direction, the long fibers having a 1 st long fiber positioned around the 1 st opening and a 2 nd long fiber positioned around the 2 nd opening on at least one of the 1 st surface and the 2 nd surface, the 1 st long fiber and the 2 nd long fiber directly crossing each other or indirectly crossing each other through another long fiber.

The absorbent body for an absorbent article of the present invention has the following preferred embodiments.

(1) The 1 st long fiber extends to the periphery of the 2 nd opening across a separation portion located between the 1 st opening and the 2 nd opening, and the 2 nd long fiber extends to the periphery of the 1 st opening across the separation portion.

(2) The opening further includes a 2 nd direction orthogonal to the 1 st direction, a 1 st imaginary line overlapping the center of the 1 st opening and extending in the 2 nd direction, and a 2 nd imaginary line overlapping the center of the 2 nd opening and extending in the 2 nd direction, and the 1 st long fibers and the 2 nd long fibers cross the separation portion so as to intersect the 1 st imaginary line and the 2 nd imaginary line.

(3) The long fibers further include a 3 rd long fiber extending in the 1 st direction, and the 3 rd long fiber intersects with the 1 st long fiber and the 2 nd long fiber.

(4) The long fibers partially span the opening.

(5) The long fibers are thermoplastic resin fibers, and have an average fiber length of 6 to 70 mm.

(6) The absorbent core also hasHaving superabsorbent polymer particles having a mass of 5g/m²～400g/m²。

(7) The area of each opening is 12mm on average²～150mm²The ratio of the total area of the plurality of openings to the area of the absorbent core is 1% to 50%.

(8) The opening portion has a rectangular shape.

(9) The opening portion has a rhombic shape.

(10) The long fibers are uniformly arranged throughout the absorbent core.

(11) The long fibers are arranged closer to the opening edge of the opening than to other regions.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the absorbent body for an absorbent article of the present invention, it is possible to suppress complete clogging of the openings in a worn state, and to maintain desired air permeability and ease of deformation.

Drawings

The drawings illustrate specific embodiments of the present invention, including not only the indispensable structures of the invention but also alternative and preferred embodiments.

Fig. 1 is a partially broken perspective view of a sanitary napkin using an absorbent body for an absorbent article of the present invention.

Fig. 2 (a) is a partially broken plan view of the absorbent core. Fig. 2 (b) is an enlarged view of a region surrounded by a one-dot chain line ii (b) of fig. 2.

Fig. 3 is an enlarged view of a region surrounded by a one-dot chain line III in fig. 2 (b).

Fig. 4 is an enlarged view of the 1 st opening after the absorbent core has absorbed bodily fluids.

Fig. 5 (a) is a view similar to fig. 3 showing an example of modification of the absorber. Fig. 5 (b) is a view similar to fig. 3 of another example of the modification. Fig. 5 (c) is a view similar to fig. 3, showing another example of the modification.

Fig. 6 (a) is a plan view similar to fig. 2 showing still another example of modification of the absorber. Fig. 6 (b) is a plan view similar to fig. 2 showing still another example of modification of the absorber. Fig. 6 (c) is a plan view similar to fig. 2 showing still another modification of the absorber. Fig. 6 (d) is a plan view similar to fig. 2 showing still another modification of the absorber. Fig. 6 (e) is a plan view similar to fig. 2 showing still another example of modification of the absorber.

Fig. 7 is a plan view of a disposable diaper showing another use example of the absorbent body of the present invention.

Detailed Description

The following embodiments relate to the absorbent body for disposable absorbent articles shown in fig. 1 to 7, and include not only the indispensable structure of the invention but also alternative and preferable structures.

Referring to fig. 1 to 3, a sanitary napkin 10 shown as an example of an absorbent article of the present invention has a longitudinal direction Y and a transverse direction X, a skin-facing surface and a non-skin-facing surface on the opposite side, and includes a liquid-permeable top sheet 11, a liquid-impermeable back sheet 12, and an absorbent body 13 interposed between these two sheets.

The back sheet 12 projects further outward in the lateral direction than the front sheet 11, and a pair of side sheets 15 are fixed to the front side of the back sheet 12. The end flaps 16 positioned on the outer side in the longitudinal direction Y than the absorbent body 13 are formed by parts of the front sheet 11, the back sheet 12, and the side sheet 15, and the pair of side flaps 17 positioned on the outer side in the lateral direction X than the absorbent body 13 and having a pair of flap portions that are convexly curved outward in the lateral direction X at the central portion are formed by the back sheet 12 and the side sheet 15. The

sheets

11, 12, and 15 facing each other are bonded to each other by a known adhesive means, for example, a hot melt adhesive, and are welded to each other by a peripheral seal portion 19 extending along the outer periphery of the sanitary napkin 10.

The surface sheet 11 can be made of a material commonly used in the art, for example, a nonwoven fabric formed of thermoplastic resin fibers such as a spunbond nonwoven fabric, a hot-melt bonded nonwoven fabric, a meltblown nonwoven fabric, an SMS nonwoven fabric obtained by laminating a spunbond nonwoven fabric, a meltblown nonwoven fabric and a spunbond nonwoven fabric, an apertured plastic film, or the like. Similarly, as the back sheet 12, materials commonly used in the art, for example, a liquid-impermeable or moisture-permeable liquid-impermeable plastic film, various fiber nonwoven fabrics made of thermoplastic resin fibers, and a laminate sheet obtained by joining a fiber nonwoven fabric to the outer surface of a plastic film can be preferably used.

The absorbent body 13 has an absorbent core 20 shaped into a desired shape and a core wrap sheet 21 for wrapping the absorbent core 20. The core wrap sheet 21 is optional, and the absorbent body 13 may also be formed of only the absorbent core 20 as long as the absorbent core 20 has a desired shape retention property. The absorbent body 13 has a stiffness higher than the stiffness of each sheet, is so-called semi-rigid, and has a 1 st end edge 13a and a 2 nd end edge 13b which are convexly curved outward in the longitudinal direction Y, and both

side edges

13c and 13d which linearly extend in the longitudinal direction Y between the 1 st end edge 13a and the 2 nd end edge 13 b.

Although not shown, a convex portion may be formed in the central portion in the longitudinal direction Y and the lateral direction X of the absorbent body 13, and the absorbent core 20 in the convex portion has a higher mass than other regions and a larger thickness than other regions. As described above, by forming the convex portion in the absorbent body 13, the convex portion can be brought into close contact with the excretory opening of the wearer, and menstrual blood can be absorbed and retained more effectively. In the case where the absorber 13 has a convex portion, the openings 40 may be sparsely arranged in the convex portion or the openings 40 may not be arranged at all in order to absorb the bodily fluid more effectively.

The absorbent core 20 is formed of a mixture including water-absorbent fibers 25, superabsorbent polymer particles (sap) 26, and long fibers 30 longer than the water-absorbent fibers 25. As the water-absorbent fiber 25, cellulose-based materials commonly used in the art can be preferably used, for example, wood pulp made of coniferous trees or broadleaf trees, non-wood pulp made of hemp, cotton, or the like, regenerated cellulose fibers such as rayon fibers, and semi-rigid fibers such as acetate fibers.

SAP particles 26 can be used as known in the art. For example, particles made of polyacrylic acid, polyacrylate, starch acrylonitrile copolymer, polyvinyl alcohol, polyvinyl ether, polyacrylamide, carboxymethyl cellulose, natural polysaccharides, and the like can be used.

The long fibers 30 are natural fibers or synthetic fibers having a fiber length longer than that of the water-absorbent fibers 25, and it is preferable to use thermoplastic resin fibers. The thermoplastic resin fiber is a single fiber obtained by using a single component such as Polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), or nylon, or a composite fiber formed of a plurality of the above components.

The composite fiber preferably contains at least two or more components having mutually different melting points, and examples thereof include sheath-core fibers, side-by-side fibers, sea-island fibers, and shaped fibers such as flat, Y-shaped, and C-shaped fibers. In particular, from the viewpoint of industrial cheapness, it is preferable to use sheath-core fibers such as PET/PE and PP/PE (core/sheath) which have a lower melting point of the sheath component than that of the core component. The mass ratio, cross-sectional area ratio, and diameter ratio of the core component to the sheath component are appropriately adjusted in consideration of a desired crimp ratio, spinnability during production, and the like, that is, since there is a tendency that if the ratio of the sheath component is too small, weldability is lowered, and if the ratio of the sheath component is too large, spinnability is lowered, for example, the ratio thereof is 10/90 to 90/10, preferably 30/70 to 70/30. The "melting point" of the thermoplastic resin fiber means a peak top temperature of an endothermic peak at the time of changing from a solid state to a liquid state when measured at a temperature increase rate of 10 ℃/minute in a differential scanning calorimeter. As the differential scanning calorimeter, for example, a DSC-60 type DSC measurement apparatus manufactured by shimadzu corporation can be used.

The core wrap sheet 21 is used for liquid diffusion and shape retention of the absorbent core 20, and a nonwoven fabric formed of thermoplastic resin fibers and subjected to hydrophilization treatment or the like can be used in addition to the tissue paper. The core wrap sheet 21 may be 1 sheet covering the entire absorbent core 20, or may be formed of a plurality of sheets, i.e., an upper core wrap sheet covering the skin-facing surface side of the absorbent core and a lower core wrap sheet covering the non-skin-facing surface side.

Referring to fig. 2 (a) and (b), the absorbent core 20 is provided with a plurality of openings 40 arranged at intervals in the longitudinal direction Y and the transverse direction X. The absorbent body 13 (absorbent core 20) has a longitudinal center line P bisecting the dimension 2 in the transverse direction X and a transverse center line Q bisecting the dimension 2 in the longitudinal direction Y.

The openings 40 are arranged in a so-called staggered shape in which the openings are arranged at equal intervals in the lateral direction X and the longitudinal direction Y, and form a plurality of rows 50 extending obliquely with respect to the longitudinal center line P and the transverse center line Q. Specifically, a plurality of columns 50 are formed along the 1 st direction K1 obliquely intersecting the longitudinal center line P and the transverse center line Q, and the columns are arranged at intervals from each other in the 2 nd direction K2 orthogonal to the 1 st direction K1. The 1 st direction K1 can intersect the longitudinal center line P at an appropriate angle of inclination, and in the illustrated example, intersects at an angle of inclination of about 45 degrees. The plurality of openings 40 may be arranged at different intervals, not at equal intervals.

As described above, the absorbent core 20 having the plurality of openings 40 has excellent air permeability, and can prevent the interior of the sanitary napkin 10 from becoming stuffy after absorption of body fluids. Further, the absorbent core 20 is excellent in flexibility, and in a state where the absorber 13 is pressed between groin portions of the wearer, the absorbent core 20 can be bent at a plurality of portions with the vicinity of the opening 40 as a starting point, and the absorbent core 20 can be deformed along a curved body shape.

Referring to FIG. 2 (b), the length t1 of 1 side of the opening 40 is 4mm to 15mm, preferably 6mm to 12 mm. When the length t1 of 1 side is less than 4mm, the opening portion 40 is easily crushed in a worn state, and air permeability may be reduced. On the other hand, if the length t1 of 1 side exceeds 15mm, the opening 40 is relatively too large, and this may give a wearer and/or a wearer aid a feeling of uneasiness with respect to absorbency, and it may be difficult for bodily fluids such as menstrual blood and urine to actually migrate to the absorbent body 13, thereby reducing the absorption performance.

The separation dimension R1 between the openings in the 1 st direction K1 is substantially equal to the separation dimension R2 between the openings in the 2 nd direction K2, and is 4mm to 15mm, preferably 6mm to 12 mm. When the separation dimensions R1 and R2 are less than 4mm, the opening 40 is easily crushed in a worn state, and air permeability may be reduced, and the ratio of the opening 40 is large, which may give a wearer and/or a wearer a feeling of uneasiness in terms of absorbency. On the other hand, when the separation dimensions R1 and R2 exceed 15mm, the ratio of the openings 40 is relatively small, and the desired air permeability and ease of deformation may not be exhibited.

Fig. 3 is an enlarged view of a region surrounded by a one-dot chain line III in fig. 2 (b) rotated counterclockwise by about 45 degrees for convenience of explanation, and an arbitrary 1 st row 51 among the rows 50 constituted by the plurality of openings 40 has a 1 st opening 41 and a 2 nd opening 42 separated in the 1 st direction K1. In addition, the 2 nd column 52 adjacent to the 1 st column 51 in the 2 nd direction K2 has the 3 rd opening portion 43 and the 4 th opening portion 44 spaced apart in the 1 st direction K1. The 1 st opening 41 and the 2 nd opening 42, and the 3 rd opening 43 and the 4 th opening 44 are disposed to face each other with the

separation portions

71 and 72 therebetween in the 1 st direction K1, respectively. Fig. 2 (a), (b), and 3 are views of the skin-facing surface side (1 st surface side) of the absorbent core 20 as viewed in plan, but it is preferable that at least one of the skin-facing surface side (1 st surface side) and the non-skin-facing surface side (2 nd surface side) of the absorbent core 20 has the illustrated form. For convenience of explanation, in fig. 3 and 4, the long fibers 30 having a network structure around the 1 st to 4 th openings 41 to 44 are indicated by thick black lines, and the long fibers 30 having a network structure around the other openings 40 are indicated by light black lines.

The structure of the long fibers 30 located around the 1 st to 4 th openings 41 to 44 in the 1 st and 2

nd rows

51 and 52 will be described below, but the structure is similar to that of all the openings 40 in each row 50 except for a part thereof. In the network structure of the long fibers 30 around the openings 40, the other openings 40 of the 1 st row 51 and the 2 nd row 52 arranged side by side with the 1 st to 4 th openings 41 to 44 and the openings 40 of the rows adjacent to the 1 st row 51 and the 2 nd row 52 in the 2 nd direction K2 have the same configuration, but are omitted in the drawings for convenience of explanation. In order to maintain the shape of each opening 40, it is preferable that all the long fibers 30 positioned around each opening 40 directly or indirectly intersect with each other.

The 1 st opening part 41 and the 2 nd opening part 42 have

outer end sides

41a, 42a and

opposite sides

41b, 42b extending in the 2 nd direction K2, and 1 st and 2 nd side edges (both side edges) 41c, 41d, 42c, 42d extending in the 1 st direction K1, respectively. Similarly, the 3 rd opening portion 43 and the 4 th opening portion 44 have

outer end sides

43a, 44a and

opposite sides

43b, 44b extending in the 2 nd direction K2, and 1 st and 2 nd side sides (both side edges) 43c, 43d, 44c, 44d extending in the 1 st direction K1, respectively.

As described above, the absorbent core 20 includes the water-absorbent fibers 25 and the long fibers 30 preferably formed of thermoplastic resin fibers and optionally includes the SAP particles 26. The long fiber 30 has the long fiber for shape retention 31 positioned around the 1 st opening 41 and the long fiber for shape retention 32 positioned around the 2 nd opening 42 in the 1 st row 51. Here, the phrase "the long shape-retaining

fibers

31 and 32 are located around the 1 st opening 41 and the 2 nd opening 42" means that the long shape-retaining

fibers

31 and 32 extend along at least the 1

st sides

41c and 42c of the 1 st opening 41 and the 2 nd opening 42 extending in the 1 st direction K1 and the

opposite sides

41b and 42b of the 2 nd opening K2 so as to surround the entire peripheries of the 1 st opening 41 and the 2 nd opening 42, respectively.

In the illustrated embodiment, the long shape-retaining fiber 31 located around the 1 st opening 41 extends from the outside of the 1 st side edge 41c of the 1 st opening 41 to the periphery of the 2 nd opening 42 (the 2 nd side edge 42d side of the 2 nd opening 42) across the separation portion 71 located between the 1 st opening 41 and the 2 nd opening 42. The long shape-retaining fiber 32 located around the 2 nd opening 42 extends from the outside of the 1 st side 42c of the 2 nd opening 42 across the divided portion 71 to the periphery of the 1 st opening 41 (the 2 nd side 42d of the 1 st opening 41). In this way, the shape retaining

long fibers

31 and 32 extend toward the

openings

41 and 42 facing each other, and directly intersect each other at the separation portion 71.

In row 2, the long shape-retaining fiber 33 is positioned around the 3 rd opening 43 and the long shape-retaining fiber 34 is positioned around the 4 th opening 44, as in row 1 51. The shape retaining long fiber 33 extends from the outside of the 1 st side 43c of the 3 rd opening 43 to the periphery of the 4 th opening 44 (the 2 nd side 44d of the 4 th opening 44) across the separation portion 72 between the 3 rd opening 43 and the 4 th opening 44. The long shape-retaining fiber 34 extends from the outside of the 1 st side 44c of the 4 th opening 44 across the dividing portion 72 to the periphery of the 3 rd opening 43 (the 2 nd side 43d of the 3 rd opening 43), and the long shape-retaining fiber 33 and the long shape-retaining fiber 34 directly intersect with each other at the dividing portion 72.

The long fibers 30 have long connecting fibers 35 to 37 extending in the 1 st direction K1 so as to intersect the long shape-retaining

fibers

33 and 34 located around the openings 41 to 44. The long connecting fibers 35 to 37 include the long connecting fiber 35 positioned outside the 2 nd row 52, the long connecting fiber 36 positioned between the 1 st row 51 and the 2 nd row 52, and the long connecting fiber 37 positioned outside the 1 st row 51 in the 2 nd direction K2. Specifically, the long connecting fiber 35 extending substantially straight in the 2 nd direction K2 intersects the long

shape retaining fibers

33 and 34, the long connecting fiber 36 extending while being bent in the 2 nd direction K2 intersects the long shape retaining fibers 31 to 34, and the long connecting fiber 37 extending substantially straight in the 2 nd direction K2 intersects the long

shape retaining fibers

31 and 32. In this manner, the shape retaining long fibers 31 to 34 are directly crossed with each other or indirectly crossed with each other via the connecting long fibers 35 to 37, and a network structure formed of the long fibers 30 is formed around the openings 41 to 44.

Here, the long fibers 30 crossing each other means that they simply overlap each other in the thickness direction of the absorbent core 20, and also includes a case where the fibers are interlaced with each other. The interlacing of the fibers with each other includes not only the physical entanglement of the fibers but also the formation of interlacing points where the thermoplastic resin fibers are thermally fused with each other by heat treatment at the time of production. The long fibers 30 of the present embodiment include all of simple intersections, physical intersections, and intersections formed by fusion, and in order to form a stable network structure realized by the long fibers 30, it is preferable that the long fibers include a larger number of physically-intersected portions than the simple intersections, and more preferable that the long fibers include a larger number of thermally-fused intersections than the physically-intersected portions.

Referring to fig. 4, in a worn state of the sanitary napkin 10, the excreted body fluid is absorbed and held by the absorbent core 20 and the absorbent fibers 25. Specifically, the body fluid is absorbed by the absorbent fibers 25 and the SAP particles 26 and temporarily stored in the fiber gaps, but since the absorbent body 13 is pressed between the groin portions of the wearer, pressing forces directed inward act on both side edge portions of the absorbent body 13, and there is a possibility that the plurality of openings 40 formed in the entire region of the absorbent core 20 are deformed and clogged. In addition, the SAP particles 26 that absorb and hold body fluid swell and gel, and a plurality of SAP particles 26 are aggregated into a block. Since the SAP particles 26 are gelled and become block-like, the block-like portion tries to enter the 1 st opening 41 to deform the shape of the peripheral edge portion of the 1 st opening 41, and it is difficult to maintain the opening shape before excretion. As described above, since the opening area of the 1 st opening 41 is reduced or the 1 st opening 41 is completely closed, the absorbent core 20 may not exhibit desired air permeability and deformation easiness.

In the present embodiment, the shape-retaining long fibers 31 to 34 are positioned around the respective openings 41 to 44, and they directly cross each other and/or indirectly cross each other via one or a plurality of other long fibers to form a network structure in a plan view, thereby suppressing the shape deformation of the openings 41 to 44. Thus, even if the absorbent body 13 is pressed between the groin of the wearer and the SAP particles 26 are in a block shape and want to block the openings 41-44, the openings 41-44 are not completely blocked. That is, the shape is kept to such an extent that the opening area thereof can be maintained to some extent, and thus desired air permeability and ease of deformation can be exhibited, and reduction in stuffiness and following ability with respect to body movement in a worn state can be suppressed. Referring to fig. 4, the SAP particles 26 swell and gel after absorbing body fluid, forming a plurality of block portions. Since the block portions of the SAP particles 26 are formed, the 1 st opening 41 is deformed so that the rectangular shape before wearing cannot be maintained and changed to the irregular shape, but the

long fibers

31, 32, 36, and 37 located at the periphery of the 1 st opening 41 are formed into a network structure so that the desired opening area can be maintained without being completely closed.

The shape-retaining long fibers 31 to 34 are preferably extended so as to surround the entire periphery of the openings 41 to 44 in order to retain the shapes of the 1 st to 4 th openings 41 to 44, and are preferably at least positioned around the openings 41 to 44 so that the openings 41 to 44 are not completely closed in the worn state but are retained to a degree that can maintain the opening area to a certain extent. Specifically, the long shape-retaining fibers 31 to 34 located around the openings 41 to 44 preferably cross the divided

portions

71 and 72, and the long shape-retaining fibers 31 to 34 intersect virtual lines N1 and N2 which overlap the center points O1 to O4 of the one opening 41 to 44 located around and extend along the 2 nd direction K2, that is, which extend parallel to the transverse center line Q, and virtual lines N1 and N2 which overlap the center points O1 to O4 of the other opening 41 to 44 facing the one opening 41 to 44 and extend along the 2 nd direction K2.

More specifically, for example, the following positions are located: one end of the long shape-retaining fiber 31 located around the 1 st opening 41 intersects the imaginary line N1 of the 1 st opening 41 outside the 1 st side 41c of the 1 st opening 41 in the 2 nd direction K2, the central portion thereof intersects the central portion of the long shape-retaining fiber 32 located around the 2 nd opening 42 at the dividing portion 71, and the other end thereof intersects the imaginary line N2 overlapping the center point O2 of the 2 nd opening 42 and extending in the 2 nd direction K2 outside the 2 nd side 42d of the 2 nd opening 42 in the 2 nd direction K2. The shape-retaining long fibers 32 to 34 located around the 2 nd to 4 th openings 42 to 44 also have the same shape. In the present embodiment, since the openings 40 have the same shape and the same size, the virtual lines N1 and N2 overlapping the center points O1-O4 of the openings 40 arranged in the 2 nd direction K2, that is, the 1 st opening 41 and the 3 rd opening 43, and the 2 nd opening 42 and the 4 th opening 44, coincide with each other, but when the openings have different sizes and shapes, the virtual lines N1 and N2 are different from each other.

The shape of each of the openings 41 to 44 can be maintained by forming the shape-retaining long fibers 31 to 34 into a network structure by directly crossing each other, but in the present embodiment, the shape-retaining long fibers 31 to 34 are also indirectly crossed by the connecting long fiber 35 extending in the 1 st direction K1, so that a more stable network structure can be formed and higher shape retention can be exhibited. In the absorbent core 20, the body fluid temporarily accumulates in the plurality of openings 40, and is rapidly absorbed and diffused by the water-absorbent fibers 25 and the SAP particles 26 located on the inner circumferential surfaces of the openings 40.

The plurality of openings 40 are essentially through holes penetrating the absorbent core in the thickness direction, but it is difficult to remove all the long fibers from the openings 40 in the production process, and some of the long fibers may be located in the openings 40. Referring to fig. 3, a part 30a of the long fibers 30 extends across the 3 rd opening 43. By thus causing the part 30a of the long fibers to extend over the opening 40, the part can function together with the network structure located around the opening 40, and the opening 40 can be prevented from being crushed and closed in a wearing state. In addition, water-absorbent fibers made of pulp fibers may be partially entangled with the long fibers. In this case, the network structure formed of the long fibers 30 is further reinforced.

The long fibers 30 are thermoplastic resin fibers, and have an average fiber length of 6mm to 70mm, preferably 15mm to 40 mm. If the average fiber length of the long fibers 30 is less than 6mm, it tends to be difficult for any thermoplastic resin fiber to entangle with another thermoplastic resin fiber and/or the water-absorbent fiber 25. When the average fiber length exceeds 70mm, the thermoplastic resin fibers are significantly reduced in the fiber opening property, and the absorbent body 13 partially contains the non-opened thermoplastic resin fibers, which may reduce the uniformity of the absorbent body 13.

The water-absorbent fibers 25 are mainly pulp fibers having an average fiber length of 2mm to 5mm, which are mixed in the absorbent core 20 and located in the

separation portions

71 and 72, and contribute to the shape retention of the openings 40 although the effect is small, but since the openings 40 used in the present embodiment are formed relatively large, the pulp fibers do not extend from the periphery of the openings 40 across the

separation portions

71 and 72 to the periphery of the other openings 40 opposed to the openings 40 in the 1 st direction K1. The long fibers 30 are longer than the pulp fibers and longer than at least the lengths of the separated portions 71 and 72 (separated dimensions R1 and R2), and therefore can contribute more to the shape retention of the openings 40 than the pulp fibers.

< method for measuring average fiber Length >

The thermoplastic resin fibers of the long fibers 30 and the fibers other than the pulp fibers, such as regenerated cellulose fibers and semisynthetic fibers, of the water-absorbent fibers 25 have an average fiber length in accordance with JIS L1015: "determination of fiber length" in appendix a of 2010 "A7.1.1A method (standard method) for" determination of fiber length a7.1 "and" method for determining the length of each fiber on a graduated glass plate ". The above method is a test method corresponding to ISO 6989 issued in 1981. The average fiber length of pulp fibers is a weight-weighted average fiber length, and is an l (w) value measured by using the fiber characteristics (off-line) of a kanani fiber analyzer manufactured by metso automation (offline).

The mass of the SAP particles 26 is 5g/m²～400g/m²Preferably 10g/m²～300g/m². The SAP particles 26 swell to several tens to several hundreds times their own weight by absorbing body fluid and thus function to block the openings 40, and the mass thereof is preferably as low as possible, but the mass of the SAP particles 26 is less than 5g/m²In this case, the absorbent core 20 has a low absorption capacity, and thus cannot absorb and hold all the discharged body fluid, which may cause side leakage. On the other hand, the mass of the SAP particles 26 exceeds 400g/m²In the case of (2), the SAP particles 26 are gelled and have a relatively large number of portions in a block shape, and even if the opening 40 is surrounded by the network structure formed by the long fibers 30, the block portion may enter the opening 40 to crush the entire peripheral edge portion of the opening 40, and may be clogged.

The area of each opening 40 was 12mm on average²～150mm². The area of each opening 40 is less than 12mm²In the case of (3), the opening 40 is relatively small and may be blocked in a wearing state, thereby reducing air permeability. On the other hand, the area of each opening 40 exceeds 150mm on average²In this case, the opening 40 appears relatively large, and may give the wearer and/or the auxiliary wearer a feeling of fitThe feeling of uneasiness in the absorbency of the absorbent body 13.

The ratio of the total area of the plurality of openings to the area of the absorbent core is 1% to 50%. The openings 40 are formed to have a larger area than the openings defined in the absorber (absorbent core) of the conventional absorbent article, so that the air inside can reliably pass through each opening 40, and the openings can function as the folding points of the absorbent core 20 in a worn state. The opening portion 40 has a relatively large area, so that the opening portion 40 is not completely blocked even if the opening area is slightly reduced by being pressed by the crotch of the wearer or being crushed by the block-like portions of the SAP particles while being shape-preserved by the network structure of the long fibers 30.

In order to effectively maintain the shape of the opening 40, the long fibers 30 are preferably arranged substantially uniformly throughout the entire absorbent core 30. The long fibers 30 are arranged substantially uniformly throughout the entire absorbent core 30, and therefore have relatively high rigidity even if the absorbent core 30 is thin, and even if a force to close the opening 40 acts in the longitudinal direction Y and/or the lateral direction X in a worn state, for example, the force can be received by the entire absorbent core 30, and the closing of the opening 40 can be suppressed.

In order to effectively maintain the shape of the opening 40, the long fibers 30 may be arranged closer to the opening edge of the opening 40 than to other regions. For example, the shape-retaining long fibers 31 to 34 and the connecting long fibers 35 to 37, which are mixed in the long fibers 30 of the absorbent core 20 and are positioned around the openings 41 to 44, contribute to the shape retention of the openings 41 to 44, but the long fibers 30 which are not positioned around the openings 41 to 44 may not contribute much to the shape retention of the openings 41 to 44, and therefore may be arranged relatively sparsely.

The opening 40 has a rectangular shape, i.e., a substantially square shape, having the same shape and size and the same length on each side, and has a sharp corner. Since the corners have sharp tips, the long fibers 30 are present in a bent state around the corners, as compared with the case where the corners are curved, and therefore the long fibers 30 are entangled with each other more, and a network structure is easily formed.

Further, since the opening 40 is square, even if a force directed inward in the lateral direction X acts on the absorber 13 by the groin portion when the wearer wears the clothes, the force can be received in a wide range by the two side edges extending linearly so as to intersect with the force, and the opening 40 can be prevented from being closed. Further, the opposite sides of the plurality of square-shaped opening portions 40 extending in the transverse direction X are opposed to each other across the separating

portions

71, 72, so as to be able to be bent in the longitudinal direction Y along the body shape at the separating

portions

71, 72.

Unlike the illustrated example, the opening 40 may be arranged such that the 1 st direction K1 is parallel to the longitudinal center line P and/or the transverse center line Q. However, as shown in the drawing, the 1 st direction K1 extends obliquely with respect to the longitudinal center line P and/or the transverse center line Q, so that the force acting obliquely on the absorbent body 13 to close the opening, which is generated when the wearer moves his or her thighs, can be received by the obliquely extending sides in the worn state, and therefore the opening 40 can be said to be less likely to be closed.

The opening 40 may have a rectangular shape, i.e., a rectangular shape, which is long in the 1 st direction K1 or the 2 nd direction K2. By providing the openings 40 with a rectangular shape, the length of the side extending in the 1 st direction K1 and the length of the side extending in the 2 nd direction K2 are different from each other, so that the long fibers 30 can be arranged in a more irregularly bent state than in the case of a square shape, and it can be said that the long fibers 30 are more entangled with each other. The opening 40 may be circular, elliptical, rhombic, or polygonal, instead of rectangular, as long as the desired technical effects are achieved.

In particular, when the openings 40 have a diamond shape and the size of the openings 40 in the transverse direction X is larger than the size in the longitudinal direction Y, the fibers are easily oriented in the transverse direction X by a manufacturing method described later, and therefore, it is difficult to close the openings 40 by a force applied in the transverse direction X. On the other hand, when the openings 40 have a diamond shape and the size of the openings 40 in the longitudinal direction Y is larger than the size in the lateral direction X, fibers are easily oriented in the longitudinal direction Y by a manufacturing method described later, so that the rigidity of the openings 40 with respect to the longitudinal direction Y is improved, and for example, the fit near the vaginal opening of the wearer can be improved. The openings 40 may not have the same shape and the same size but have different sizes and shapes, and for example, each row 50 may be formed by combining openings 40 having a rectangular shape and a circular shape which have different sizes.

As described above, the long fibers 30 can be formed of a composite fiber, for example, a sheath-core fiber including a core portion and a sheath portion having a melting point lower than that of the core portion. In the case where the long fibers 30 are formed of sheath-core fibers, the long fibers 30 formed of thermoplastic resin fibers can be fused to each other at the interlacing points by a relatively low set temperature in the heat treatment process of the manufacturing process, and the long fibers 30 can be crimped. By crimping the long fibers 30 so that they are easily interlaced with each other, a more stable network structure can be formed. The long fibers 30 may have a plurality of types of composite fibers having different crimp rates. In this case, the long fibers 30 have different degrees of crimp from each other, and are irregularly interlaced to form a more stable network structure. The heat treatment process in the manufacturing process includes, for example, a press and heat treatment process for shaping the absorbent core 20, a hot embossing process for applying heat to the surface of the sanitary napkin 10, and the like. By performing these heat treatment processes, at least a part of the long fibers 30 located on the heat-treated surface of the absorbent core 20 is melted.

The method for producing the absorbent core 20 can be any production method conventionally used in the art, and can be produced, for example, by the following method.

The manufacturing apparatus of the absorbent core 20 includes a duct and a molding drum having a concave mold frame on the peripheral surface facing the duct, and supplies the SAP particles 26, the long fibers (thermoplastic resin fibers) 30, and the absorbent fibers 25 into the duct through respective supply paths located upstream of the duct. Air is sucked in the interior of the duct from the inflow opening of the duct towards the outflow opening thereof by means of a suction mechanism of the forming drum. The SAP particles 26, the long fibers 30, and the water-absorbent fibers 25 fly and mix inside the duct along with the air flow, become core materials, and move toward the outflow port.

When the rotating forming drum is opposite the outflow opening of the duct, air is sucked from the mold frame towards the interior of the drum by means of a suction mechanism, so that the mixed core material accumulates on the mold frame. A plurality of protrusions are arranged on the bottom surface of the mold frame, and the core absorbent material is not accumulated on the protrusions. Thereafter, the core material accumulated in the mold frame is held in the mold frame by the suction force of the suction mechanism and is brought close to the conveyor by the rotation of the forming drum, and the core material is sucked from the mold frame to the conveyor by the suction force of the suction mechanism located below the conveyor while opposing the conveyor. Then, the core material is compressed by a conveyor in operation in a pressure/heat compression step to form the absorbent core 20.

With this production method, when the core material is deposited on the mold frame of the molding drum, the core material is not deposited on the plurality of projections arranged on the bottom surface of the mold frame, and thus the plurality of openings 40 can be formed in the absorbent core 20. The long fibers 30 that have passed from the duct to the protrusion portion collide with the protrusion portion and scatter around the protrusion portion, and therefore, the long fibers are located around the protrusion portion in a plan view. Similarly, the long fibers 30 are scattered in the plurality of protrusions, and the long fibers 30 located in the periphery of each protrusion are directly or indirectly crossed with each other in a plan view. In this production method, for example, the long fibers 30 may be scattered from the periphery of the projection portion by making the projection portion have a sharp shape at the tip, so that the long fibers 30 intersect with each other to form a network structure. The long fibers 30, and the long fibers 30 and the water-absorbent fibers 25 may be well mixed and entangled with each other by making the shape of the projection sharp at the tip or/and in a state where the long fibers 30 and the water-absorbent fibers 25 are mixed for a relatively long time in the conveyance path before the SAP particles 26 are mixed in the duct, and the entangled state may be maintained when the SAP particles are accumulated in the mold frame of the forming drum.

In another manufacturing method, for example, in the above-described manufacturing process, a plurality of projections are not arranged on the bottom surface of the mold frame of the molding drum, and after the core material is sucked from the molding drum to the conveyor and before or after the compression process, the core material is inserted and pulled out so as to be separated without cutting the core material by a plurality of sharp-pointed pins, thereby forming a plurality of openings 40. In this case, the long fibers 30 pulled out by the sharp-pointed pins are located around the openings 40 in a plan view, and the long fibers 30 located around the openings 40 are connected to each other in a grounded manner or directly intersect each other. In this production method, in order to form a plurality of openings 40 by inserting sharp-pointed pins into the absorbent core 20 without substantially cutting the long fibers 30, it is necessary to appropriately adjust all of the conditions such as the mass, distribution range, distribution area, size of the openings 40, opening ratio, conveying speed of the absorbent core 20 on the conveyor, and pin insertion speed of the long fibers 30.

< method for measuring thickness dimension of absorbent >

As for the thickness (mm) of the absorbent body 13, FS-60DS (measuring surface 44mm (diameter)) manufactured by Daorhiki Seisakusho K.K. was prepared, and the measurement pressure was 3g/cm²]The thickness of each part after 10 seconds of pressurization was measured by pressurizing 5 different parts of the absorbent body 13 in a standard state (temperature 23 ± 2 ℃, relative humidity 50 ± 5%), and the average of the 5 measured values was set as the thickness dimension of the absorbent body 13.

Fig. 5 (a) is a view similar to fig. 3 showing an example of a modification of the absorbent body 13 for an absorbent article of the present invention. In the present modification, each of the openings 41 to 44 has a circular shape instead of a rectangular shape. The long shape-retaining fibers 31 to 34 located in the circular shape around the openings 41 to 44 cross the divided

portions

71 and 72, and the long shape-retaining fibers 31 to 34 intersect with an imaginary line (not shown) that overlaps the center points O1 to O4 of the openings 41 to 44 located around and extends in the 2 nd direction K2, that is, extends parallel to the transverse center line Q, and an imaginary line (not shown) that overlaps the center point O1-O4 of the opening 41 to 44 facing the openings 41 to 44 located around and extends in the 2 nd direction K2. Therefore, the openings 41 to 44 can be kept in shape to such an extent that they are not completely blocked by the network structure formed by the long fibers 30.

Fig. 5 (b) is a view showing another example of a modification of the absorbent body 13 for an absorbent article of the present invention. In this modification, the long shape-retaining fiber 31 located around the 1 st opening 41 extends in a curved shape so as to surround the half circumference of the 1 st opening 41, and the long shape-retaining fiber 32 located around the 2 nd opening 42 extends in a curved shape so as to surround the half circumference of the 2 nd opening 41. The shape-retaining

long fibers

31 and 32 directly intersect each other at the separation section 71, and do not indirectly intersect each other via the long connecting fibers 35 to 37. Even in this case, the shape-retaining

long fibers

33 and 34 can be formed into a network structure capable of maintaining the shapes of the openings 41 to 44 only by directly crossing each other. The long shape-retaining

fibers

33 and 34 located around the 3 rd opening 43 and the 4 th opening 44 also have the same configuration as the long shape-retaining

fibers

31 and 32.

Fig. 5 (c) is a diagram showing another example of a modification of the absorbent body 13 for an absorbent article of the present invention. In this modification, the long shape-retaining fiber 31 located around the 1 st opening 41 extends in a curved shape so as to surround the half circumference of the 1 st opening 41, and the long shape-retaining fiber 32 located around the 2 nd opening 42 extends in a curved shape so as to surround the half circumference of the 2 nd opening 42. The shape retaining

long fibers

31 and 32 are arranged to face each other so as to be separated at the separation portion 71 in the 1 st direction K1, and are not directly crossed with each other but are only indirectly crossed with each other by the long connecting fiber 36 extending in the 1 st direction K1. Even in this case, the shape-retaining

long fibers

31 and 32 can be formed into a network structure capable of maintaining the shapes of the openings 41 to 44 only by indirectly intersecting each other. The long shape-retaining

fibers

31 and 32.

Fig. 6 (a) to (e) are plan views showing another example of a modification of the absorbent body 13 of the present invention. In the embodiment shown in fig. 6 (a), a plurality of openings 40 are not arranged at the central portion 74 in the longitudinal direction Y and the lateral direction X of the absorber 13. In this embodiment, for example, in the case where the absorbent article is a sanitary napkin 10, menstrual blood can be absorbed sufficiently and quickly without arranging a plurality of openings 40 in the central portion 74 facing the vicinity of the vaginal opening of the wearer. Further, by arranging a plurality of openings 40 in the region other than the central portion 74, it is possible to exhibit desired air permeability and to have appropriate conformability to the body of the wearer.

In the embodiment shown in fig. 6 (b), a plurality of openings 40 are arranged only in the central portion 74 in the longitudinal direction Y and the lateral direction X of the absorbent body 13. In this embodiment, for example, in the case where the absorbent article is a disposable diaper, body fluid is absorbed by drawing in through the plurality of openings 40 disposed in the central portion 74, and body fluid can be effectively absorbed in situ.

In the embodiment shown in fig. 6 (c), a plurality of openings 40 are arranged in the entire absorber 13, and

openings

40A and 40B having different sizes are alternately arranged in each row 50 arranged in the 1 st direction K1. In this embodiment, as compared with the case where the opening 40 is formed only by a plurality of openings having the same shape and the same size, the appearance of the absorbent body 13 is improved, and by arranging the relatively small openings 40B, the feeling of uneasiness in the absorption of the absorbent body 13 can be suppressed for the wearer and/or the wear assistant.

In the embodiment shown in fig. 6 (d), the plurality of openings 40 are not arranged over the entire region of the central portion in the lateral direction X of the absorbent body 13, that is, the dimension in the longitudinal direction Y of the intermediate portion 75. In this embodiment, the appearance is improved as compared with the case where the openings 40 are disposed over the entire absorbent body 13, and the plurality of openings 40 are not disposed over the entire region of the dimension in the longitudinal direction Y of the intermediate portion 75, whereby the wearer and/or the wear assistant can be prevented from feeling uneasy about the absorption of the absorbent body 13.

In the embodiment shown in fig. 6 (e), the open regions 76 in which the plurality of openings 40 are arranged and the non-open regions 77 in which the plurality of openings 40 are not arranged are alternately arranged in the absorber 13 in the longitudinal direction Y. In this embodiment, the opening regions 76 are arranged alternately with the non-opening regions 77 in the longitudinal direction Y, so that the aesthetic appearance is improved as compared with the case where the plurality of openings 40 are arranged at equal intervals throughout the absorbent body 13, and the plurality of opening regions 76 maintain the necessary air permeability and the conformability to the body of the absorbent body 13, and the non-opening regions 77 are positioned between them in the longitudinal direction Y, so that the absorbent body 13 has the necessary rigidity with respect to the lateral direction X, and twisting during wearing can be suppressed.

Fig. 7 shows an example of use of the absorbent body 13 for an absorbent article of the present invention, and in this use example, the absorbent body 13 is used in a disposable diaper (absorbent article) 80. A state is shown in which the side seams for joining both side edge portions of the front waist sheet 84 and the rear waist sheet 85 are peeled off in the disposable diaper 80 and the disposable diaper 80 is stretched in the transverse and longitudinal directions.

The disposable diaper 80 has a front waist region 81, a rear waist region 82, and a crotch region 83 located between the front waist region 81 and the rear waist region 82. In addition, the diaper 80 includes: a front waist sheet 84 that divides the parts forming the front waist region 81 and the crotch region 83; a rear waist panel 85 that divides the rear waist region 82 and the crotch region 83; and a liquid-absorbing structure 86 extending in the longitudinal direction on the skin-facing surfaces of the front and

rear waist sheets

84, 85, wherein both side edges of the front and

rear waist sheets

84, 85 are joined to each other by a plurality of seam parts 88 arranged at intervals in the longitudinal direction in a state where both side edges of the front and

rear waist sheets

84, 85 are overlapped with each other, thereby defining a waist opening and a pair of leg openings. The absorbent body 13 extends from the crotch region 83 to the front waist region 81 and the rear waist region 82 in the liquid absorbent structure 86.

The diaper 80 is a so-called pants type in which both side edge portions of the front waist region 81 and the rear waist region 82 are joined in advance, and in the same manner as the sanitary napkin 10, in a worn state, the absorbent body 13 located in the crotch region 83 is pressed between the groin portions of the wearer, and the SAP particles 26 having absorbed body fluid swell and gel to form a block portion, and the shape of the opening 40 may be deformed, but the long fibers 30 are made to have a network structure, so that the shape of the opening 40 can be maintained and desired air permeability and ease of deformation can be exhibited. The absorbent article of the present invention may be not only a pants-type diaper but also an open-type diaper.

As the members constituting the

absorbent articles

10 and 80, known materials generally used in the art other than the materials described in the present specification can be used without limitation as long as they are not specifically described. In addition, the terms "1 st", "2 nd", "3 rd" and "4 th" and the like used in the present specification are used only for distinguishing the same elements, positions and the like.

Description of the reference numerals

10. Sanitary napkins (absorbent articles); 20. an absorbent core; 25. a water-absorbent fiber; 26. superabsorbent polymer particles (SAP particles); 30. a long fiber; 30a, part of the long fibers; 31. a long fiber for shape retention (the 1 st long fiber, the 2 nd long fiber); 32. a long fiber for shape retention (the 1 st long fiber, the 2 nd long fiber); 33. a long fiber for shape retention (the 1 st long fiber, the 2 nd long fiber); 34. a long fiber for shape retention (the 1 st long fiber, the 2 nd long fiber); 35. a long fiber for connection (3 rd long fiber); 36. a long fiber for connection (3 rd long fiber); 37. a long fiber for connection (3 rd long fiber); 40. an opening part; 41. 1 st opening part; 42. a 2 nd opening part; 43. a 3 rd opening part; 44. a 4 th opening part; 71. a separation section; 72. a separation section; 80. disposable diapers (absorbent articles); k1, direction 1; k2, direction 2; n1, phantom line (1 st phantom line); n2, phantom line (2 nd phantom line); O1-O4, the center point of the opening; x, transverse direction; y, longitudinal direction.

Claims

1. An absorbent body for an absorbent article, characterized in that,

the absorbent body for an absorbent article comprises: an absorbent core having a 1 st face and a 2 nd face opposed to each other in a thickness direction; and a plurality of openings penetrating the absorbent core in the thickness direction,

the absorbent core includes water-absorbent fibers and long fibers longer than the water-absorbent fibers,

the opening has a 1 st opening and a 2 nd opening arranged in the 1 st direction at a distance from the 1 st opening,

the long fibers have a 1 st long fiber positioned around the 1 st opening and a 2 nd long fiber positioned around the 2 nd opening on at least one of the 1 st surface and the 2 nd surface,

the 1 st long fiber and the 2 nd long fiber are directly crossed with each other or indirectly crossed with each other by means of other long fibers.

2. The absorbent body according to claim 1, wherein,

the 1 st long fiber extends to the periphery of the 2 nd opening across a separation portion located between the 1 st opening and the 2 nd opening, and the 2 nd long fiber extends to the periphery of the 1 st opening across the separation portion.

3. The absorbent body according to claim 2, wherein,

the opening further includes a 2 nd direction orthogonal to the 1 st direction, a 1 st imaginary line overlapping the center of the 1 st opening and extending in the 2 nd direction, and a 2 nd imaginary line overlapping the center of the 2 nd opening and extending in the 2 nd direction, and the 1 st long fibers and the 2 nd long fibers cross the separation portion so as to intersect the 1 st imaginary line and the 2 nd imaginary line.

4. The absorbent body according to any one of claims 1 to 3, wherein,

the long fibers further include a 3 rd long fiber extending in the 1 st direction, and the 3 rd long fiber intersects with the 1 st long fiber and the 2 nd long fiber.

5. The absorbent body according to any one of claims 1 to 4,

the long fibers partially span the opening.

6. The absorbent body according to any one of claims 1 to 5, wherein,

the long fibers are thermoplastic resin fibers, and have an average fiber length of 6 to 70 mm.

7. The absorbent body according to any one of claims 1 to 6, wherein,

the absorbent core also has superabsorbent polymer particles having a mass of 5g/m²～400g/m²。

8. The absorbent according to any one of claims 1 to 7, wherein,

the area of each opening is 12mm on average²～150mm²The ratio of the total area of the plurality of openings to the area of the absorbent core is 1% to 50%.

9. The absorbent according to any one of claims 1 to 8, wherein,

the opening portion has a rectangular shape.

10. The absorbent according to any one of claims 1 to 8, wherein,

the opening portion has a rhombic shape.

11. The absorbent according to any one of claims 1 to 10, wherein,

the long fibers are uniformly arranged throughout the absorbent core.

12. The absorbent according to any one of claims 1 to 10, wherein,

the long fibers are arranged closer to the opening edge of the opening than to other regions.