CN105246441B

CN105246441B - Disposable pull-on diaper

Info

Publication number: CN105246441B
Application number: CN201480030555.9A
Authority: CN
Inventors: 市川诚; 岛津健; 川上祐介; 多川信弘
Original assignee: Eunija Co Ltd
Current assignee: Eunija Co Ltd
Priority date: 2013-06-14
Filing date: 2014-05-21
Publication date: 2019-12-31
Anticipated expiration: 2034-05-21
Also published as: JP2015000181A; WO2014199789A1; CN105246441A; JP6150628B2

Abstract

The invention provides a disposable pull-on diaper having improved body fluid permeability of a packaging sheet of an absorbent body. The absorbent chassis (2) of the disposable pull-on diaper comprises an absorbent body (40). An absorbent body (40) is formed by covering a core material (41) which is an aggregate of liquid-absorbent materials containing crushed pulp and superabsorbent polymer particles with a packaging sheet (42), and the entire outer surface (41b) of the core material (41) is bonded to the packaging sheet (42) via an adhesive (HA). The inner surface (41a) of the core material (41) has a bonding region bonded to the packaging sheet (42) and a non-bonding region not bonded to the packaging sheet (42). The bonding region is formed in the center of the core material (41) in the lateral direction and on both sides of the non-bonding region.

Description

Disposable pull-on diaper

Technical Field

The present disclosure relates to a disposable pull-on diaper, and more particularly, to a disposable pull-on diaper in which a core material of an absorbent contains ground pulp and superabsorbent polymer particles.

Background

Conventionally, disposable pull-on diapers have been known, and disposable pull-on diapers in which a core material of an absorbent body contains ground pulp and super absorbent polymer particles have also been known.

For example, a disposable diaper described in Japanese patent laid-open No. 2001-120594 (patent document 1) has a problem of preventing the deformation of the absorbent body, and in an example of the diaper, the absorbent body is wrapped in a thin sheet of paper (Japanese, thin-leaved) and the absorbent body and the thin sheet of paper are fixed together with an adhesive. The absorption body is fixed to the paper laminate by means of an adhesive which is applied over the entire extent of the inner surface of the paper laminate which is opposite the skin of the diaper wearer. The outer surface of the absorbent body is not coated with an adhesive and is not bonded to the sheet paper. The absorbent is made of cotton pulp, a highly water-absorbent polymer, or the like.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2001-120594

Disclosure of Invention

Problems to be solved by the invention

In an absorbent body formed by covering an assembly of liquid-absorbent materials such as pulp and super absorbent polymers with a packaging sheet such as a sheet of paper, when the inner surface of the assembly is positioned on the side opposite to the skin of the wearer of the diaper, and the inner surface is bonded to the packaging sheet with an adhesive applied over the entire area thereof, the assembly of liquid-absorbent materials may prevent the body fluid from rapidly penetrating the packaging sheet or prevent the assembly of liquid-absorbent materials from rapidly absorbing the body fluid.

The present invention has an object to provide a disposable pull-on diaper capable of solving such a problem that occurs in an absorbent body formed by covering an aggregate of liquid-absorbent materials with a liquid-permeable packaging sheet.

Means for solving the problems

The present invention for solving the problems is a disposable pull-on diaper having a lateral direction and a longitudinal direction, comprising: a main body cover which is formed with at least the front waist region and the rear waist region of a front waist region, a rear waist region, and a lower crotch region and which can be configured in a ring shape; an absorbent substrate extending between the front waist region and the back waist region and having a front end region joined to the front waist region and a back end region joined to the back waist region, the absorbent substrate comprising an absorbent structure; the waist is opened; and a pair of leg openings.

The present invention also includes the following. That is, the absorbent base sheet includes an absorbent body contained in the absorbent structure, and the absorbent body is formed by covering a core material, which is an aggregate of liquid-absorbent materials containing at least ground pulp and superabsorbent polymer particles, with a liquid-permeable wrapping sheet. An outer surface of the aggregate facing an inner surface of the body cover is entirely bonded to the packaging sheet with an adhesive, and an inner surface of the aggregate, which is a surface opposite to the outer surface, has a bonding region bonded to the packaging sheet and a non-bonding region not bonded to the packaging sheet, the bonding region extending in the longitudinal direction at a central portion of the aggregate in the transverse direction, and the non-bonding region is located on both sides of the bonding region in the transverse direction.

The term "pull-on diaper" in the present specification refers to an article having a waist opening and a pair of leg openings, which is worn by inserting the legs of a wearer into the leg openings and lifting the wearer to the waist of the wearer. The term "disposable" generally refers to intended disposal by a single use.

ADVANTAGEOUS EFFECTS OF INVENTION

In the disposable pull-on diaper according to one or more embodiments of the present invention, the outer surface of the liquid-absorbent core is bonded to the packaging sheet, and the non-bonded region which is not bonded to the packaging sheet is formed on the inner surface of the core, so that the body fluid can be rapidly absorbed by the packaging sheet in the non-bonded region.

Drawings

The drawings show specific embodiments of the present invention, and include not only essential structures of the invention but also alternative embodiments and preferred embodiments.

Fig. 1 is a perspective view of a disposable pull-on type diaper.

Fig. 2 is a partially cut-away perspective view of the diaper in which seams at both side edges of the diaper are released and the diaper is stretched in the longitudinal and transverse directions.

FIG. 3 is a view taken along FIG. 2Line S of₃Cross-sectional view of (a).

FIG. 4 is a view taken along line S of FIG. 2₂Cross-sectional view of (a).

FIG. 5 is a view taken along line S of FIG. 2₁Cross-sectional view of (a).

FIG. 6 is a view taken along line S of FIG. 2₀Cross-sectional view of (a).

Fig. 7 is a view showing a process of manufacturing an absorbent structure.

Fig. 8 is a partially cut plan view showing an absorbent structure according to an example of the embodiment.

Fig. 9 is a view showing a cross section along line IX-IX of fig. 8.

Detailed Description

The details of the disposable pull-on type diaper of the present invention will be described below with reference to the accompanying drawings. The following embodiments relate to diapers shown in fig. 1 to 9, which include not only the essential structures of the invention but also alternative structures and preferable structures.

Referring to fig. 1, there is shown a perspective view of a disposable pull-on diaper 10 for adults, which is shown as an example of an embodiment of the present invention. The diaper 10 is adapted to be worn by male incontinent persons and includes a main body cover (Japanese: トルソカバー)1 and an absorbent substrate 2 (refer to FIG. 2) attached to the main body cover 1. The main body cover 1 includes at least a front waist region and a rear waist region among the front waist region, the rear waist region, and the lower crotch region as indispensable elements, but examples including a front waist region 3, a rear waist region 4, and a crotch region 5 are shown in the drawings. The front waist region 3 and the rear waist region 4 are joined to each other by forming a single seam 9 at their side edges 7, 8 by ultrasonic treatment, thereby forming a waist region 11 which forms a loop when the diaper 10 is worn, and defining a waist opening 12 and a pair of leg openings 13. The main body cover 1 includes a front outer sheet 16 extending along part of the crotch region 5 and the front waist region 3, a rear outer sheet 17 extending along part of the crotch region 5 and the rear waist region 4, and a center outer sheet 18 extending along the crotch region 5. In the figures, the diaper 10 is shown with the lateral direction X and the longitudinal direction Y.

Fig. 2 is a partially cut perspective view showing the inner surface side of the diaper 10 of fig. 1 in a state where the front waist region 3 and the rear waist region 4 are unfastened from the seam 9 and the diaper 10 is stretched in the lateral direction X and the longitudinal direction Y. The main body cover 1 is formed in a substantially hourglass shape, and includes a center outer sheet 18 extending along the front waist region 3, the rear waist region 4, and the crotch region 5, a front outer sheet 16 joined to the center outer sheet 18 from outside the diaper 10, and a rear outer sheet 17 similarly joined to the center outer sheet 18 from outside (see fig. 1). A plurality of front waist elastic members 21 which are contractibly extended in a state of being extended in the lateral direction X are sandwiched between the front outer sheet 16 and the center outer sheet 18. Similarly, a plurality of rear waist elastic members 22 which extend in a contractible manner while being extended in the transverse direction X are sandwiched between the rear outer sheet 17 and the center outer sheet 18. Further, a plurality of leg elastic members 23 extending in the transverse direction X and drawing a curve protruding toward the front waist region 3 are sandwiched between the rear outer sheet 17 and the center outer sheet 18 so as to be contractible in an at least partially extended state. In fig. 1, a part of both the front outer sheet 16 and the rear outer sheet 17 is folded back toward the inner surface of the diaper 10 at the edge 3a of the front waist region 3 and the edge 4a of the rear waist region 4, but in fig. 2, the folded-back parts 16a and 17a are shown by imaginary lines, and the parts 16a and 17a before folding back are shown by solid lines.

As is apparent from fig. 2, the absorbent substrate 2 extends from the crotch region 5 to the front waist region 3 and the rear waist region 4 of the main body cover 1, and has a front end region 26 partially joined to the front waist region 3, a rear end region 27 partially joined to the rear waist region 4, and an intermediate portion 28 partially joined to the crotch region 5. The absorbent substrate 2 further includes an absorbent structure 31 formed in a rectangular planar shape and a pair of seal cuffs (japanese: seal Write めカフス)32 located on both sides of the absorbent structure 31 in the transverse direction X. In fig. 2, one of the sealing beads 32 is shown by a solid line, and the other is shown by an imaginary line. The edge portions of the crotch region 5 on both sides in the transverse direction X define leg openings 3.

The seal cuff 32 has a proximal edge portion 33 fixed to the absorbent structure 31 and a distal edge portion 34 in a separable state without being joined to the absorbent structure 31 in the crotch region 5, and one or more elastic members 36 functioning as spacers are attached to the distal edge portion 34 so as to be contractible in an extended state. The distal edge portion 34 is fixed to the front end region 26 and the rear end region 27 of the absorbent structure 31. When the diaper 10 is in the state shown in fig. 1, the elastic member 36 contracts, whereby the distal edge portion 34 is separated from the absorbent structure 31 toward the wearer in at least the crotch region 5 of the diaper 10, and the respective containment flaps 32 stand up with respect to the absorbent structure 31.

Referring to FIG. 3, FIG. 4, and FIG. 5, which are views showing a cross section of the absorbent substrate 2 of the diaper 10 shown in FIG. 2, FIG. 3 shows the absorbent substrate 2 along the line S₃Fig. 4 shows a section of the absorbent substrate 2 along the line S₂、S₄Fig. 5 shows the absorbent substrate 2 along the line S₁、S₅Cross section of (2).

In FIG. 3, line S₃Coincides with the center line Q bisecting the dimension in the front-back direction of the diaper 10 of fig. 2. The absorbent structure 31 of the absorbent substrate 2 includes: an absorber 40 comprising a core 41 and a liquid-permeable wrapping sheet 42 for covering the core 41, the core 41 being an aggregate of liquid-absorbent materials comprising at least ground pulp and superabsorbent polymer particles; a liquid-permeable body-side liner 43 covering the inner surface side of the core member 41 with the wrapping sheet 42 interposed therebetween; and a liquid-impermeable back sheet 44 covering the outer surface side of the core material 41 with the packaging sheet 42 interposed therebetween. The entire outer surface 41b of the core member 41 facing the central outer sheet 18 as the inner surface 41a of the body cover 1 is a bonding region bonded to the packaging sheet 42 with, for example, a hot melt adhesive HA. The inner surface 41a of the core 41, which is the surface opposite to the outer surface 41b, is also a bonding region where the core 41 is bonded to the packaging sheet 42 on the center line P and both side portions 46 of the core 41 are regions where the packaging sheet 42 is not bonded. The core material 41 is a product for light incontinence and is made of pulp and super absorbent polymerIn the case of particle formation, the mass per unit area is preferably 300g/m²－600g/m²In the range of 60 to 40% by weight, and the superabsorbent polymer particles in the range of 40 to 60% by weight. As a specific example, 300g/m²And 200g/m²The super absorbent polymer particles of (2) can be used in a state in which the super absorbent polymer particles are uniformly mixed and in a state in which layers are formed so as to overlap each other, and can also be used in a state in which the distribution amount of the super absorbent polymer particles is different in the transverse direction X and the front-rear direction Z of the core material 41. As the super absorbent polymer particles, those conventionally used in the art, for example, hydrolysates of starch-acrylonitrile copolymers, etc., can be used. The core material 41 may be formed by mixing a liquid-absorbent material with an air flow and depositing the liquid-absorbent material in a mold having a desired shape, or may be used by spraying water on the deposited material and then compressing the material under pressure.

As the packaging sheet 42, tissue paper, liquid permeable fibrous nonwoven fabric, or the like can be used. In a state where the wrapping sheet 42 is bonded to the outer surface 41b of the core 41 with, for example, the hot melt adhesive HA, a portion extending laterally from the core 41 is wound around the core 41 to cover the inner surface 41a of the core 41, and the side portions 42a, 42b of the wrapping sheet 42 are overlapped with each other on both sides of the center line P bisecting the transverse dimension of the absorbent base sheet 2, and are bonded to each other with, for example, the hot melt adhesive HA and also bonded to the core 41. The portion where the core material 41 is bonded to the packaging sheet 42 via the hot melt adhesive HA is a bonding region where an aggregate of liquid-absorbent materials is bonded to the packaging sheet 42.

In the preferred core material 41, the overlapped side portions 42a, 42b are covered with a liquid-permeable cover sheet 45, thereby preventing the liquid-absorbent material from leaking out from between the side portions 42a, 42 b. The cover sheet 45 is joined to the wrapping sheet 42 by, for example, a hot-melt adhesive HA.

The core 41 and the wrapping sheet 42 are in close contact with each other at both side portions 46 of the core 41, but are not joined to each other. The packaging sheets 42 that are positioned outside the core material 41 in the lateral direction X and are stacked are bonded to each other with, for example, a hot melt adhesive HA. Therefore, the outer surface 41b of the core 41 is entirely fixed to the wrapping sheet 42, and only both side portions of the center line P of the inner surface 41a are fixed to the wrapping sheet 42, but the inner surfaces 41a at both side portions 46 are not covered with the hot melt adhesive. Therefore, the absorption of the body fluid through the packaging sheet 42 is not hindered by the hot melt adhesive at the inner surfaces 41a of the both side portions 46, and the movement of the ground pulp and the super absorbent polymer particles for forming the inner surfaces 41a, for example, the movement of the super absorbent polymer particles to swell, is not hindered by the presence of the hot melt adhesive. In this way, the superabsorbent polymer particles can freely swell without being hindered by their surroundings, and the absorbent body 40 can realize: the absorption speed of the body fluid is high, and the absorption amount per unit time is large.

In the bodyside liner 43 and the back sheet 44, the bodyside liner 43 is formed of a nonwoven fabric or an apertured plastic film formed using thermoplastic synthetic fibers. The back sheet 44 is formed of a plastic film, more preferably a breathable liquid-permeable plastic film. The bodyside liner 43 and the back sheet 44 are joined at the overlapping portion by, for example, a hot melt adhesive (not shown). The body-side liner 43 can be joined to the packaging sheet 42 by, for example, a hot melt adhesive (not shown) in a suitable application state such as a spiral, dot, or stripe.

The proximal edge portion 33 of the seal cuff 32 is joined to the body-side liner 43 and the back sheet 44 of the absorbent structure 31 by, for example, a hot melt adhesive (not shown). The distal edge portion 34 to which the elastic member 36 is attached is shown in a state of overlapping with the bodyside liner 43 in fig. 2, but is shown in a state of being separated from the bodyside liner 43 in fig. 3 for the purpose of clearly showing the distal edge portion 34. When the diaper 10 is in the state of fig. 1, the elastic member 36 contracts between the front end region 26 and the rear end region 27 of the absorbent structure 31, and the distal edge portion 34 protrudes above the absorbent structure 31 as shown by the imaginary line, thereby functioning as a hem (japanese patent No. カフ) for preventing side leakage of excrement.

Fig. 4 shows a line S extending along the front end region 26 overlapping with the front waist region 3 of the main body cover 1 in the absorbent structure 31₂And a rear end overlapping with the rear waist region 4 of the main body cover 1Line S of region 27₄But along the line S₂Cross section and along line S₄Are substantially identical in cross-section. In addition, although the dimension in the lateral direction X, that is, the width of the substantially rectangular absorbent structure 31 is the same when comparing the cross section of fig. 4 with the cross section of fig. 3, the core material 41 extends over the entire width of the absorbent structure 31 in fig. 4, and there is no portion where the wrapping sheets 42 overlap each other outside the core material 41. That is, the width of the core material 41 of fig. 4 is larger than the width of the core material 41 of fig. 3, and accordingly, the dimension in the lateral direction X of the both side portions 46 of the core material 41 in the state of not being joined to the wrapping sheet 42 is larger than the dimension in the lateral direction X of the both side portions 46 of fig. 3. The state in which the seal cuff 32 is attached to the absorbent structure 31 is the same as the state in fig. 3. The front outer sheet 16 or the rear outer sheet 17 is joined to the center outer sheet 18 joined to the back sheet 44 from the outside of the diaper 10 with, for example, a hot melt adhesive (not shown).

Fig. 5 shows a line S extending along a portion of the front end region 26 of the absorbent structure 31 not including the core material 41₁S that spans a portion of the rear end region 27 of the absorbent structure 31 that does not include the core material 41₅Cross section of (2). However, along these lines S respectively₁、S₅The state of the cross section of (a) is substantially the same. In fig. 5, the packaging sheet 42 extending from the core material 41 in the longitudinal direction Y is bonded to each other with, for example, a hot melt adhesive HA, and the body-side liner 43 and the back sheet 44 are bonded to the packaging sheet 42 overlapping with the body-side liner 43 and the back sheet 44 with, for example, a hot melt adhesive (not shown). The back sheet 44, the center outer sheet 18, and the front outer sheet 16 or the rear outer sheet 17 are superposed on each other and joined to each other with, for example, a hot melt adhesive (not shown). The distal edge portion 34 of the seal cuff 32 and the bodyside liner 43 are superposed on each other and joined to the bodyside liner 43 with, for example, a hot melt adhesive (not shown).

Referring to fig. 6, the absorbent structure 31 is shown along the line S in fig. 2₀Cross-sectional view of (1), line S₀Coinciding with the centre line P of fig. 2. In the absorbent structure 31, the wrapping sheet 42, the cover sheet 45 and the body-side liner 43 extend from the core member 41, and they are mutually extendedThe overlapping is joined, for example, by means of a hot-melt adhesive HA. The body-side liner 43 and the back sheet 44 are overlapped with each other at a portion extending from the packaging sheet 42, and joined to each other by means of, for example, hot melt adhesive (not shown). The center outer sheet 18 and the front outer sheet 16 joined to each other, and the center outer sheet 18 and the rear outer sheet 17 joined to each other extend from the back sheet 44. The portion 16a of the front outer sheet 16 extending from the center outer sheet 18 and the portion 17a of the rear outer sheet 17 extending from the center outer sheet 18 are folded back along the edge of the center outer sheet 18 to overlap the center outer sheet 18 and the absorbent structure 31, and are joined together with a hot melt adhesive (not shown), for example. The front outer sheet 16 and the rear outer sheet 17 are folded back in this manner to form the edge portions 3a and 4a of the waist opening 12 of the diaper 10 (see fig. 1). Waist elastic members 21, 22 are sandwiched between the center outer sheet 18 and the front outer sheet 16, which are superposed on each other, and between the center outer sheet 18 and the rear outer sheet 17, which are superposed on each other.

Fig. 7 is a view showing a process of forming the absorbent structure 31 from the core material 41 and the packaging sheet 42. Fig. 7 (a) shows a core material 41 having a substantially hourglass shape and a rectangular packaging sheet 42. The core 41 has wing portions 51 formed so that the width of a portion 41d located in the crotch region 5 of the main body cover 1 is narrower and the width of portions located in the front waist region 6 and the rear waist region 7 is wider. The packaging sheet 42 is shown by a phantom line 52 at a portion contacting the lower surface 41b (see fig. 3) of the core 41. Further, the site where the hot melt adhesive HA is applied is shown by a number of dots 53. The packaging sheet 42 is also formed with a non-coated portion 54 where the hot melt adhesive HA is not coated. The core 41 is symmetrical about the center line P, and the wrapping sheet 42 is symmetrical about the center line P.

Fig. 7 (b) shows the absorbent structure 31 formed by covering the core material 41 with the wrapping sheet 42, and the absorbent structure 31 shows the position of the covering sheet 45 overlapping the wrapping sheet 42 on the center line P with a phantom line. In fig. 7 (a), the core 41 is placed on the packaging sheet 42, and both side portions of the packaging sheet and the inner surface 41a of the core 41 are overlapped with each other, thereby forming the absorbent structure 31 of fig. 7 (b). As shown in fig. 3 and 4, in the core material 41 of the absorbent structure 31, the portions overlapping the non-application regions 54 of the packaging sheet 42 form both side portions 46 (see fig. 3) which are not joined to the packaging sheet 42. The side portions 46 include wing portions 51 and side portions located at the portion 41d of the crotch region 5. In the absorbent structure 31, the outer surface 41b of the core 41 is fixed to the wrapping sheet 42 by the hot melt adhesive HA, and the wrapping sheet 42 joined to each other by the hot melt adhesive HA are closely attached to the periphery of the core 41, so that the core 41 does not move in the lateral direction X and the front-back direction Z inside the absorbent structure 31.

Further, the outer surface 41b of the core 41 is joined to the wrapping sheet 42 as a whole, and the central portion in the transverse direction X of the inner surface 41a is further joined to the wrapping sheet 42 via, for example, a hot melt adhesive HA, so that the core 41 does not move in the transverse direction X and the longitudinal direction Y, and the core 41 is less likely to be deformed. In addition, in the diaper 10, the absorbent substrate 2 and the diaper 10 are not difficult to fit to the skin of the wearer due to the shape of the core member 41. On the other hand, the inner surface 41a of the side portion 46 of the core member 41 is not bonded to the package sheet 42, and rapid absorption of body fluid through the package sheet 42 is not hindered by the hot melt adhesive. Further, the movement of the super absorbent polymer particles in the thickness direction, the lateral direction X, and the longitudinal direction Y of the core material 41 is not hindered by the hot melt adhesive on the inner surface 41a of the side portion 46, and therefore, the swelling of the super absorbent polymer particles accompanying water absorption is not hindered by the hot melt adhesive, and the super absorbent polymer particles easily exhibit water absorption capacity.

Referring to fig. 8 and 9, a partially cut plan view of the absorbent structure 31 according to an example of the embodiment and a cross-sectional view taken along line IX-IX of the plan view are shown. In the absorbent structure 31 of the illustrated example, a plurality of compressed groove 61 are formed in the core material 41 and the wrapping sheet 42, and the compressed groove 61 is covered with the covering sheet 45. The compressed groove 61 is formed by locally compressing the core 41 and the packaging sheet 42 in a direction from the inner surface 41a toward the outer surface 41b of the core 41. At the bottom portion 61a of the compressed groove 61, the liquid-absorbent material such as ground pulp is in a compressed state, and the density of the core material 41 at the bottom portion 61a is higher than the density of the core material 41 at the peripheral region of the compressed groove 61. The preferred compressed groove 61 is formed symmetrically about the center line P at the portion where the core material 41 and the packaging sheet 42 are joined by the hot melt adhesive HA. It is also preferable that the compressed groove 61 is formed in the crotch region 5 of the main body cover 1 between the front waist region 3 and the rear waist region 4. In the case where only one pair of compressed grooves 61 is formed, the compressed grooves are preferably formed in the front portion of the crotch region 5. When the diaper 10 is a male article, when the diaper 10 is worn so that male genitals are inserted between the pair of compressed groove portions 61 formed in the front portion of the crotch region 5, the absorbent chassis 2 is preferably fitted to the body, and the diaper 10 is worn comfortably. The cover sheet 45 in the absorbent structure 31 can prevent the liquid-absorbent material such as ground pulp and super absorbent polymer particles from leaking from the package sheet 42 or the hole in the package sheet 42 and coming into contact with the skin.

The disclosure of the present invention described above can be organized into at least the following items.

A disposable pull-on diaper having a transverse direction and a longitudinal direction, the disposable pull-on diaper comprising: a main body cover which is formed with at least the front waist region and the rear waist region of a front waist region, a rear waist region, and a lower crotch region and which can be configured in a ring shape; an absorbent substrate extending between the front waist region and the back waist region and having a front end region joined to the front waist region and a back end region joined to the back waist region, the absorbent substrate comprising an absorbent structure; the waist is opened; and a pair of leg openings, the disposable pull-on diaper being characterized in that,

the absorbent base sheet comprises an absorbent body contained in the absorbent structure, and the absorbent body is formed by covering a core material, which is an aggregate of liquid-absorbent materials containing at least ground pulp and super absorbent polymer particles, with a liquid-permeable wrapping sheet,

an outer surface of the aggregate facing an inner surface of the body cover is entirely bonded to the packaging sheet with an adhesive, and an inner surface of the aggregate, which is a surface opposite to the outer surface, has a bonding region bonded to the packaging sheet and a non-bonding region not bonded to the packaging sheet, the bonding region extending in the longitudinal direction at a central portion of the aggregate in the transverse direction, and the non-bonding region is located on both sides of the bonding region in the transverse direction.

The disposable pull-on diaper of the present invention arranged as described above includes at least the following embodiments, which can be adopted separately or in combination with each other.

(1) The packaging sheet covers the inner surface of the aggregate by folding back a portion of the packaging sheet covering the outer surface of the aggregate, which portion extends from the aggregate in the lateral direction, and the folded-back packaging sheets are overlapped with each other at the central portion of the inner surface and joined to each other with an adhesive.

(2) The planar shape of the aggregate is substantially hourglass-shaped, and the wing portions extending to both sides in the lateral direction are formed in the front end region and the rear end region, and the inner surfaces of the wing portions form a part of the non-joined region.

(3) The absorbent body is formed with at least one pair of compressed groove grooves extending in the longitudinal direction and opposing in the transverse direction, the compressed groove grooves being deeper from the inner surface toward the outer surface, the compressed groove grooves being located at the joining region.

Description of the reference numerals

1. A main body cover; 2. an absorbent substrate; 3. a front waist region; 4. a rear waist region; 5. a crotch region; 10. a disposable pull-on diaper; 26. a front end region; 27. a rear end region; 31. an absorbent structure; 41. a core material and an aggregate; 41a, an inner surface; 41b, an outer surface; 42. packaging the sheet; 61. compressing the bar groove; HA. And (3) an adhesive.

Claims

1. A disposable pull-on diaper having a transverse direction and a longitudinal direction, the disposable pull-on diaper comprising: a main body cover which is formed with at least the front waist region and the rear waist region of a front waist region, a rear waist region, and a lower crotch region and which can be configured in a ring shape; an absorbent substrate extending between the front waist region and the back waist region and having a front end region joined to the front waist region and a back end region joined to the back waist region, the absorbent substrate comprising an absorbent structure; the waist is opened; and a pair of leg openings, the disposable pull-on diaper being characterized in that,

an outer surface of the core material facing an inner surface of the body cover is entirely bonded to the packaging sheet with a 1 st adhesive, while an inner surface of the core material, which is a surface on the opposite side of the outer surface, has a bonding region to which a 2 nd adhesive is applied and which is bonded to the packaging sheet, and a non-bonding region to which the 2 nd adhesive is not applied and which is not bonded to the packaging sheet, the bonding region extending in the longitudinal direction at a central portion in the transverse direction of the core material, and the non-bonding regions are both side portions located on both sides of the bonding region in the transverse direction,

the core material has an hourglass shape in plan view such that a portion located in the crotch region is narrowed and portions located in the front waist region and the rear waist region are widened, and wing portions are formed in the portions located in the front waist region and the rear waist region,

the inner surface at the wing forms part of the non-engagement region,

the side portions include the wing portions and side portions located at portions of the crotch region.

2. The disposable pull-on type diaper according to claim 1,

the wrapping sheet covers the inner surface of the core material by folding back a portion of the wrapping sheet covering the outer surface of the core material, which portion extends in the transverse direction from the core material, and the folded-back wrapping sheets are overlapped with each other at the central portion of the inner surface and bonded to each other with a hot-melt adhesive.

3. The disposable pull-on type diaper according to claim 1 or 2,

the absorbent body is formed with at least one pair of compressed groove grooves extending in the longitudinal direction and opposing in the transverse direction, the compressed groove grooves being deeper from the inner surface toward the outer surface, the compressed groove grooves being located at the joining region.