CN106572934B

CN106572934B - Pull-on wearing article

Info

Publication number: CN106572934B
Application number: CN201580042096.0A
Authority: CN
Inventors: 川上祐介; 青山史绘
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2014-08-05
Filing date: 2015-02-23
Publication date: 2020-03-03
Anticipated expiration: 2035-02-23
Also published as: CN106572934A; JP2016036396A; JP5766855B1; WO2016021217A1

Abstract

The present invention aims to improve the conventional technology and provide a pull-on wearing article in which the rear waist region is not likely to be displaced even when the front waist region is pulled down. The wearing article further has an imaginary line extending parallel to the longitudinal center line (P) and passing through a vertex (20) of an edge portion of the waist opening (23) located at the side seam (22), and the side seam (22) has a 1 st portion (22A) extending rearward from the vertex (20) in a downhill manner and a 2 nd portion (22B) extending forward in a downhill manner while being curved from the 1 st portion (22A) and intersecting the imaginary line (80).

Description

Pull-on wearing article

Technical Field

The present invention relates to a pull-on wearing article.

Background

Conventionally, pull-on wearing articles having side seams connecting both side edges of a front waist region and both side edges of a rear waist region to each other are well known. For example, patent document 1 discloses a pull-on wearing article in which side seams linearly extend in the vertical direction.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2009-131539 (P2009-131539A)

Disclosure of Invention

Problems to be solved by the invention

In the wearing article disclosed in patent document 1, the side seams are formed by a plurality of welded portions arranged in a line at predetermined intervals in the vertical direction, and the welded portions have a relatively narrow width dimension, so that when the side seams are peeled from one end in the vertical direction to the other end, the peeling force can be concentrated on the welded portions and the side seams can be easily peeled.

However, since the side seams have a shape extending linearly in the vertical direction, for example, when the wearer holds the front waist region and pulls it obliquely downward to open the waist opening in order to place the separate absorbent pad on the wearing article in the worn state, a force tending to pull it obliquely forward acts on the entire side seams, and therefore, the entire rear waist region slides downward. Therefore, when worn directly, the wearing sensation is impaired, and the leakage of excrement may be caused. Further, in the case of correcting the position of the rear waist region, after the absorbent pad is disposed, it is necessary to perform adjustment so that the absorbent pad does not shift while lifting the rear waist region to an appropriate position, and therefore, it takes labor and time.

The present invention aims to improve the conventional art and provide a pull-on wearing article in which there is no fear of displacement of the rear waist region even when the front waist region is pulled down in a worn state.

Means for solving the problems

The present invention for achieving the above object relates to an improvement in a pull-on wearing article having a longitudinal direction and a lateral direction orthogonal to the longitudinal direction, and a vertical direction in a worn state and a front-back direction orthogonal to the vertical direction, the pull-on wearing article including a longitudinal center line equally dividing a dimension 2 in the lateral direction, a skin-facing surface and a non-skin-facing surface on a side opposite to the skin-facing surface, a chassis having a front waist region, a rear waist region, and a crotch region located between the front waist region and the rear waist region, a liquid-absorbing structure attached to the chassis, side seams connecting both side edges of the front waist region and the rear waist region, a waist opening, and a pair of leg openings.

The wearing article according to claim 1 of the present invention is characterized by further comprising an imaginary line extending parallel to the longitudinal centerline and passing through a vertex of an edge of the waist opening at the side seam, wherein the side seam comprises a 1 st portion extending rearward from the vertex in a downhill manner and a 2 nd portion extending forward from the 1 st portion in a curved manner in a downhill manner and intersecting the imaginary line.

A wearing article according to claim 2 of the present invention is characterized in that a rear waist elastic region which is stretchable in the lateral direction is located in the rear waist region, the liquid-absorbent structure includes a liquid-absorbent core having a rear end edge and a rear end portion extending outward in the longitudinal direction from the rear end edge of the liquid-absorbent core, and the rear waist elastic region includes: an upper elastic region extending from the waist opening to a position closer to the crotch region than a rear end edge of the liquid-absorbent structure, and provided with a plurality of upper rear waist elastic bodies extending in the transverse direction; and a lower elastic region disposed on the crotch region side of the upper elastic region and including a plurality of lower rear waist elastics extending in the transverse direction, wherein an extension stress of the upper elastic region is lower than an extension stress of the lower elastic region, the upper rear waist elastics are disposed at substantially equal intervals in the longitudinal direction, and a dimension of separation in the longitudinal direction of the mutually adjacent upper rear waist elastics is equal to a dimension of separation in the longitudinal direction of the mutually adjacent elastics located on the waist opening side of the lower rear waist elastics.

ADVANTAGEOUS EFFECTS OF INVENTION

In the pull-on wearing article of the present invention, the side seam has the 1 st portion extending rearward in a downhill shape from the apex thereof and the 2 nd portion extending forward in a downhill shape while being curved from the 1 st portion, so that when the front waist region is pulled obliquely downward to open the waist opening, the 1 st portion is pulled obliquely forward to slide downward, and on the other hand, the pulling force does not or hardly acts on the 2 nd portion, and the entire rear waist region does not slide downward to a large extent.

Drawings

The drawings show specific embodiments of the present invention disclosed herein, and include not only indispensable structural elements of the invention but also optional and preferred embodiments.

Fig. 1 is a perspective view of a disposable diaper seen from the back side, which is shown as an example of the pull-on wearing article of the present disclosure.

Fig. 2 is a partially cross-sectional and developed plan view of the diaper extending in the longitudinal and transverse directions until the elastic bodies are maximally stretched (to the extent that the gathers formed by the contraction action of the elastic bodies disappear).

Fig. 3 is a partially cut-away exploded perspective view of the diaper.

Fig. 4 is a schematic sectional view taken along line IV-IV of fig. 1.

Figure 5 is a top view of the front waist region.

Figure 6 is a top view of the rear waist region.

Fig. 7 (a) is a perspective view from the back side showing a state when the conventional diaper is worn. Fig. 7 (b) is a schematic sectional view taken along line VIIb-VIIb.

Fig. 8 (a) is a perspective view from the back side showing a state in which the diaper shown in fig. 1 is worn. Fig. 8 (b) is a schematic sectional view along the line VIIIb-VIIIb.

Fig. 9 (a) is a side view of a conventional diaper in a worn state. Fig. 9 (b) is a view showing a state in which the front waist region is slid obliquely downward in a worn state of the conventional diaper.

Fig. 10 is a side view of the diaper in a worn state.

Fig. 11 is a view showing a state where the front waist region is slid obliquely downward in a worn state of the diaper.

Detailed Description

The following embodiments relate to pull-on wearing articles shown in fig. 1 to 11 as an example of the present invention, and include not only indispensable configurations of the present invention but also optional and preferable configurations. In fig. 2, each elastic body described later is in a state in which: each elastic body is stretched against its contractive force to such an extent that the gathers produced in the member to which each elastic body is attached appear to disappear substantially in a natural visual sense due to the contractive force in the lateral direction X and the longitudinal direction Y.

Referring to fig. 1 to 3, a disposable pull-on diaper 10 as an example of the pull-on wearing article of the present invention has a longitudinal direction Y and a transverse direction X orthogonal to each other, a skin-facing surface and a non-skin-facing surface opposite to the skin-facing surface, a longitudinal axis P bisecting a length dimension in the transverse direction X, and a transverse axis Q bisecting the length dimension in the longitudinal direction Y, and the disposable pull-on diaper 10 is substantially symmetrical about the longitudinal axis P and includes a front waist region 11, a rear waist region 12, and a crotch region 13 located between the front waist region 11 and the rear waist region 12.

The diaper 10 includes a chassis 14 in the form of a chassis base, and the chassis 14 includes a front end edge (front waist opening edge) 14a and a rear end edge (rear waist opening edge) 14b opposed to each other in the longitudinal direction Y, and both

side edge portions

14c and 14d having a concave curved central portion for defining the crotch region 13. The narrowest portion of the crotch portion 13, which is contoured by the

side edge portions

14c and 14d, is located closer to the front waist portion 11 than the horizontal axis Q. Both

side edge portions

11a, 11b of the front waist region 11 and both

side edge portions

12a, 12b of the rear waist region 12 are connected to each other by side seams 22 intermittently extending in the longitudinal direction Y at side edge portions facing each other in the front-rear direction Z of the diaper 10, thereby defining a waist opening 23 and a pair of leg openings 24. In the side seams 22, the sheets that are overlapped with each other are welded to each other by a known means such as embossing by heat or ultrasonic waves. The side seams 22 are formed linearly in parallel with the

side edges

11a, 11b of the front waist region 11, the

side edges

12a, 12b of the rear waist region 12, and the longitudinal centerline P in the process of manufacturing the diaper 10. However, in the diaper 10, the side seams 22 have a shape curved toward the rear waist region 12 side due to a difference in contraction amount between elastic regions in which the waist elastic members are arranged, which are opposed to each other in the front-rear direction and are located above the center portions in the vertical direction of the front waist region 11 and the rear waist region 12.

The substrate 14 comprises: a base sheet 25 made of a fibrous nonwoven fabric, which is positioned on the skin-facing surface and continuously defines the front waist region 11, the rear waist region 12, and the crotch region 13; a front waist panel 26 and a rear waist panel 27 made of a fibrous nonwoven fabric, which are located on the non-skin-facing side and are opposed to each other so as to be spaced apart from each other in the longitudinal direction Y; and a liquid-absorbent structure 15 located on the skin-facing surface side of the base sheet 25 and extending from the crotch region 13 to the front waist region 11 and the rear waist region 12.

< base plate >

The base sheet 25 has a 1 st end edge 25a and a 2 nd end edge 25b which are opposed to each other so as to be separated in the longitudinal direction Y, and

opposite side edges

25c and 25d which are opposed to each other so as to be separated in the lateral direction X. The

side edges

25c and 25d are formed by straight portions in the front waist region 11 and the rear waist region 12 and curved portions that are curved in the crotch region 13 so as to protrude more deeply from the rear waist region 12 side toward the front waist region 11 side toward the longitudinal axis P.

< front waist panel >

The front waist panel 26 is formed in a substantially trapezoidal shape forming a part of the front waist region 11 and the crotch region 13, and is defined by an intermediate inner end edge 26a and an outer end edge 26b extending in the lateral direction X, both

outer side edges

26c and 26d extending in the longitudinal direction Y, and both

inner end edges

26e and 26f connecting the both

outer side edges

26c and 26d and the intermediate inner end edge 26 a. The side

inner end edges

26e and 26f have straight portions extending straight in the lateral direction X from the

outer side edges

26c and 26d, and curved portions extending from the straight portions to the middle inner end edge 26 a. The front waist panel 26 has a bent portion 33 bent inward along the waist opening edge. The folded portion 33 is folded inward along the 1 st end edge 25a of the base sheet 25 in a state where the liquid-absorbent structure 15 described later is disposed on the inner surface of the base sheet 25, and is fixed to the skin-facing surface of the base sheet 25 and the liquid-absorbent structure 15.

< rear waist part >

The rear waist panel 27 has a substantially trapezoidal shape forming a part of the rear waist region 12 and the crotch region 13, and is defined by an intermediate inner end edge 27a and an outer end edge 27b extending in the lateral direction X, both

outer end edges

27c, 27d extending in the longitudinal direction Y from the outer end edge 27b, and both

inner end edges

27e, 27f connecting the both

outer end edges

27c, 27d and the intermediate inner end edge 27a in a curved shape. The rear waist panel 27 has a bent portion 38 bent inward along the waist opening edge. The folded portion 38 is folded inward along the 2 nd end edge 25b of the base sheet 25 in a state where the liquid-absorbent structure 15 is disposed on the inner surface of the base sheet 25, and is fixed to the skin-facing surface of the base sheet 25 and the liquid-absorbent structure 15.

Referring to fig. 2 to 4, the front waist elastic members 61 to 64 extending in the transverse direction X in the front waist region 11 are attached so as to be contractible between the front waist panel 26 and the base panel 25 in an extended state. The rear waist elastics 71 to 74 extending in the transverse direction X in the rear waist region 12 and the hip elastics 76 extending in a curved shape from the rear waist region 12 toward the crotch region 13 are attached so as to be contractible in an extended state between the rear waist panel 27 and the base panel 25. The front waist region 11 and the rear waist region 12 have a front waist elastic region and a rear waist elastic region which are elastically stretchable and contractible as described later by disposing respective elastic bodies.

As the base sheet 25, the front waist sheet 26 and the back waist sheet 27, those having a mass per unit area of about 10g/m can be used²～40g/m²A fiber density of about 0.03g/cm³～0.10g/cm³For example, a spunbonded fiber nonwoven fabric, an SMS (spunbond/meltblown/spunbond) fiber nonwoven fabric, a hot air fiber nonwoven fabric, a plastic sheet, or a laminate thereof. In the present embodiment, the base sheet 25 can be used with a grammage of about 10g/m²～18g/m²Preferably a grammage of about 13g/m²The SMS fiber nonwoven fabric of (2) can be used as the front waist sheet 26 and the rear waist sheet 27, and the grammage can be about 15g/m²～25g/m²Preferably a grammage of about 20g/m²A spunbonded fiber nonwoven fabric.

Referring to a partial enlarged view of the outer surface of the rear waist region 12 shown in fig. 1, in the present embodiment, as an option, a lattice-like embossing pattern 28 is arranged by performing a lattice-like embossing process on the outer surfaces of the front waist sheet 26 and the rear waist sheet 27. The embossed pattern 28 is formed by intersecting the 1 st concave line 29A and the 2 nd concave line 29B, which are formed by arranging a plurality of compressed concave portions and extend obliquely with respect to the vertical axis P and the horizontal axis Q. In the compressed concave portions, the thermoplastic resin of the fibrous nonwoven fabric forming the front waist sheet 26 and the rear waist sheet 27 is thermally welded, and a bulky and soft non-compressed portion 30 is defined between the 1 st concave line 29A and the 2 nd concave line 29B. Further, at least the fibrous layer on the outer surface side of the front waist sheet 26 and the back waist sheet 27 preferably has crimped fibers. In this case, the flexibility of the sheets is increased in cooperation with the embossed pattern 28, and the sheets can have an appearance of underwear. In the present embodiment, the center portion 13c of the crotch region 13 is formed only by the base sheet 25, but may be formed by a plurality of sheets.

The diaper 10 is mainly for adults used by the elderly and the like, and as to each size of the diaper 10 (the same size as the corresponding size of the chassis 14), the size L1 in the longitudinal direction Y of the diaper 10 is about 600mm to 1000mm, the size W1 in the transverse direction X is about 400mm to 800mm, and the size L2 in the longitudinal direction Y of the

front edge portions

11a, 11b of the front waist region 11 (the same size as the size in the longitudinal direction Y of the

rear edge portions

12a, 12b of the rear waist region 12) is about 200mm to 250 mm.

< liquid-absorbing Structure >

Referring to fig. 2 and 3, the liquid-absorbent structure 15 has a front end edge 15a and a rear end edge 15b that are opposed to each other in the longitudinal direction Y and extend in the transverse direction X, and two side edges 15c that are opposed to each other in the transverse direction X and extend in the longitudinal direction Y. The liquid-absorbent structure 15 includes a liquid-permeable fibrous nonwoven fabric body-side liner 50 positioned on the skin-facing surface side, a liquid-absorbent core 51 having curved side edges and having liquid absorption properties, a pair of barrier rib-top sheets 52, and a leakage-proof sheet 53.

The liquid-absorbent core 51 has a front end edge 51a extending in the transverse direction X in the front waist region 11 and a rear end edge 51b extending in the transverse direction X in the rear waist region 12, and is formed of, for example, a mixture of fluff pulp and absorbent polymer particles, and the whole of the core is covered with a liquid-absorbing and diffusing core wrap sheet such as tissue paper. The body-side liner 50, the barrier rib top sheet 52, and the leakage-preventive sheet 53 extend outward in the longitudinal direction Y from the front end edge 51a and the rear end edge 51b of the liquid-absorbent core 51, respectively. The liquid-absorbent structure 15 has a front end portion 16A formed by these sheet members extending outward in the longitudinal direction Y from the front end edge 51a of the liquid-absorbent core 51, and a rear end portion 16B formed by these sheet members extending outward in the longitudinal direction Y from the rear end edge 51B of the liquid-absorbent core 51.

The liquid-absorbent structure 15 and the base sheet 25 are joined to each other via a joining region formed by a known joining means such as a hot-melt adhesive applied to at least one of the opposing surfaces thereof. The joining region includes a plurality of joining portions arranged apart from each other by a desired dimension in the longitudinal direction Y, and includes a front joining portion 59A for fixing a part of the front end portion 16A of the liquid-absorbent structure 15 to the base sheet 25, a rear joining portion 59B for fixing a part of the rear end portion 16B of the liquid-absorbent structure 15 to the base sheet 25, and a center joining portion 59C for fixing the center portion of the liquid-absorbent structure 15 to the base sheet 25.

Referring to fig. 2, the pair of barrier rib top sheets 52 are formed by folding in two and fixing the inner surfaces to each other, and have front and rear fixing portions facing each other in the longitudinal direction Y and fixed to the skin-facing surface of the body-side liner 50, a fixed side edge portion 52b extending in the longitudinal direction Y, and a free side edge portion 52a located inward in the transverse direction X from the fixed side edge portion 52 b. The rib top elastic body 57 formed of a thread-like or strand-like elastic material and extending in the longitudinal direction Y is attached in a contractible manner in an extended state in the free side edge portion 52a of the barrier rib top sheet 52. The cuff elastic body 57 contracts to separate the free side edge portion 52a from the bodyside liner 50 toward the wearer's body, thereby forming a pair of leakage preventing cuffs for preventing leakage of body fluid. The leakproof sheet 53 is formed of a liquid-impermeable fibrous nonwoven fabric, a liquid-impermeable moisture-permeable plastic film, or a laminate thereof, and is disposed so as to cover at least substantially the entire lower surface of the liquid-absorbent core 51, and is used to prevent body fluid from leaking from the non-skin-facing surface (bottom surface) side of the liquid-absorbent structure 15.

< front waist elastic region >

The front waist region 11 has front waist

elastic regions

60A, 60B, and front waist elastic bodies 61-64 positioned between the front side edge portions 11a, 11B are arranged in the front waist

elastic regions

60A, 60B. For convenience of explanation, the front waist

elastic regions

60A and 60B have: an upper elastic region 60A in which a plurality of fine-thread or strand-like upper front waist

elastic bodies

61, 62 extending in the transverse direction X are arranged, extending from the front waist opening edge 14a to a position closer to the crotch region 13 than the front end edge 15a of the liquid-absorbent structure 15; and a lower elastic region 60B located closer to the crotch region than the upper elastic region 60A, and on which a plurality of thin or strand-like lower front waist

elastic bodies

63, 64 extending in the transverse direction X are arranged. When the dimension in the longitudinal direction Y of the front side edge portions 11a, 11B of the front waist region is about 200mm to 250mm, the dimension in the longitudinal direction Y of the upper elastic region 60A is about 100mm to 120mm, and the dimension in the longitudinal direction Y of the lower elastic region B is about 100mm to 130 mm.

The upper front waist

elastic bodies

61, 62 include a 1 st front waist elastic body 61 positioned on the front waist opening edge 14a side and a 2 nd waist elastic body 62 positioned on the crotch region 13 side of the 1 st front waist elastic body 61, and the lower front waist

elastic bodies

63, 64 include a 3 rd front waist elastic body 63 positioned on the front waist opening edge 14a side and a 4 th front waist elastic body 64 positioned on the crotch region 13 side of the 3 rd front waist elastic body 63.

The number of strands, fineness, and pitch of the front waist elastic bodies 61 to 64 are appropriately adjusted according to the size of the diaper 10, and in the present embodiment, the 1 st front waist elastic body 61 is formed of an elastic material having a fineness of about 300dtex to 800dtex and a pitch of about 4mm to 8mm, and arranged in a state of being extended by about 2.2 times to 2.4 times, the 2 nd front waist elastic body 62 is formed of an elastic material having a fineness of 300dtex to 800dtex and a pitch of 6mm to 12mm, and arranged in a state of being extended by about 2.2 times to 2.4 times, the 3 rd front waist elastic body 63 is formed of an elastic material having a fineness of 600dtex to 950dtex and a pitch of 6mm to 12mm, and arranged in a state of being extended by about 2.3 times to 2.7 times, and the 4 th front waist elastic body 64 is formed of an elastic material having a fineness of 600dtex to 1200dtex, a pitch of 6mm to 12mm, and arranged in a state of being extended by about 2.3 times to 2.7 times. In the present specification, the spacing (separation dimension) between the adjacent front and rear waist elastic bodies refers to the dimension in the longitudinal direction of the region where no elastic body is present formed between the elastic bodies in the longitudinal direction Y. The phrase "the pitches are substantially the same" means that the difference caused by a manufacturing error of about 0mm to 3.0mm or the like is included.

< rear waist elastic region >

The rear waist region 12 has rear waist

elastic regions

70A, 70B, and rear waist elastics 71-74 located between the rear waist opening edge 14B and the rear end edge 51B of the liquid-absorbent core 51 are disposed in the rear waist

elastic regions

70A, 70B. For convenience of explanation, the rear waist

elastic regions

70A, 70B have: an upper elastic region 70A extending from the rear waist opening edge 14b to a position closer to the crotch region 13 than the rear end edge 15b of the liquid-absorbent structure 15, and on which a plurality of upper rear waist

elastic bodies

71, 72 in a thin thread or strand shape extending in the transverse direction X are disposed; and a lower elastic region 70B in which a plurality of thin or strand-like lower rear waist

elastic bodies

73, 74 extending in the transverse direction X are disposed at a position on the crotch region 13 side from the upper elastic region 70A. The upper elastic region 70A of the rear waist

elastic regions

70A, 70B extends from the rear waist opening edge 14B to a position closer to the crotch region 13 than the rear end edge 15B of the liquid-absorbent structure 15, and the lower elastic region 70B is located between the upper elastic region 70A and the rear end edge 51B of the liquid-absorbent core 51. When the dimension in the longitudinal direction Y of both side edge portions 12a, 12B of the rear waist region 12 is about 200mm to 250mm, the dimension in the longitudinal direction Y of the upper elastic region 70A is about 70mm to 100mm, and the dimension in the longitudinal direction Y of the lower elastic region 70B is about 130mm to 150 mm.

The upper rear waist elastics 71, 72 have a 1 st rear waist elastic body 71 located on the rear waist opening edge 14b side and a 2 nd rear waist elastic body 72 located on the crotch region 13 side of the 1 st rear waist elastic body 71, and the lower rear waist elastics 73, 74 have a 3 rd rear waist elastic body 73 located on the rear waist opening 14b side and a 4 th rear waist elastic body 74 located on the crotch region 13 side of the 3 rd rear waist elastic body 73.

The number of the rear waist elastics 71 to 74, the fineness and the pitch are appropriately adjusted according to the size of the diaper 10, and in the present embodiment, the 1 st rear waist elastic 71 is formed of an elastic material having a fineness of about 300dtex to 800dtex and a pitch of about 4mm to 8mm and arranged in a state of being extended by about 2.2 times to 2.4 times, the 2 nd rear waist elastic 72 is formed of an elastic material having a fineness of 600dtex to 950dtex and a pitch of 4mm to 8mm and arranged in a state of being extended by about 1.8 times to 2.2 times, the 3 rd rear waist elastic 73 is formed of an elastic material having a fineness of 600dtex to 950dtex and a pitch of 4mm to 8mm and arranged in a state of being extended by about 2.3 times to 2.7 times, and the 4 th rear waist elastic 74 is formed of an elastic material having a fineness of 600dtex to 1200dtex and a pitch of 12mm to 18mm and arranged in a state of being extended by about 2.3 times to 2.7 times.

< method for measuring elongation stress >

The elongation stress of the elastic region in which each waist elastic body is disposed is measured by a tensile tester manufactured by shimadzu corporation. The measurement was carried out by cutting out each elastic region from the front waist region 11 and the rear waist region 12 of the diaper 10 having a dimension W1 of 600mm in the transverse direction X to prepare a sample. First, one end of the sample was fixed to the upper chuck in the tensile test, and the other end of the sample was fixed to the lower chuck, and they were separated by 180mm (the size of the grip portion of the chuck was about 15 mm). Next, the lower chuck was moved at a speed of 100mm/min until the distance between the chucks was 460mm, the movement was reversed, the distance between the chucks was brought close to 180mm, and then the movement was reversed again, and the elongation stress (N) was measured at the time when the distance between the chucks was 460 mm.

As a result of the above measurement, the extension stress of the upper

elastic regions

60A, 60B of the front waist elastic body was about 1.1N, the extension stress of the lower elastic region 60B was about 2.0N, and the extension stress of the upper elastic region 70A of the rear waist

elastic regions

70A, 70B was about 1.3N, and the extension stress of the lower elastic region 70B was about 2.9N. Thus, the upper elastic region 60A < the lower elastic region 60B, and the upper elastic region 70A < the lower elastic region 70B are related to the elongation stress of these elastic regions. The extension stress of the elastic region in which the 2 nd front waist elastic body 62 is disposed is about 0.98N, which is the elastic region having the lowest extension stress of the front waist

elastic regions

60A and 60B, and the extension stress of the elastic region in which the 4 th rear waist elastic body 74 is disposed is about 1.98N, which is the elastic region having the highest extension stress of the rear waist

elastic regions

70A and 70B. The extension stress of the elastic region in which the 1 st rear waist elastic body 71 is disposed and the extension stress of the elastic region in which the 2 nd rear waist elastic body 72 is disposed are approximately equal to each other, about 1.3N. Further, from the above results, the elongation stress of the elastic region where the 2 nd rear waist elastic body 72 is disposed is higher than the elongation stress of the elastic region where the 2 nd front waist elastic body 62 is disposed.

Referring to fig. 2 and 6, the chassis 14 has a hip elastic region extending from the rear waist region 12 to the crotch region 13. In the hip elastic region, a plurality of hip elastic bodies 76 extending in a curved manner toward the transverse axis Q are attached so as to be contractible in an extended state. The hip elastic body 76 can be formed of a plurality of fine thread-like or strand-like elastic materials having a fineness of about 600dtex to 950dtex and an elongation magnification of about 1.0 times to 2.5 times. In the rear waist region 12, a hip covering portion formed of only sheet members is defined between the 4 th rear waist elastic body 74, the hip elastic body 76, and the side edges 15c of the liquid absorbent structure 15. Since the hip covering portion is formed only of the sheet member, it has flexibility and a size enough to cover the hip of the wearer in a wide range.

As described above, in the front waist region 11 and the rear waist region 12, the extension stress of the upper

elastic regions

60A, 70A is lower than the extension stress of the lower

elastic regions

60B, 70B, respectively. As described above, since the elongation stress ratio of the upper

elastic regions

60A and 70A located on the side of the waist opening 23 is small, even an elderly person with weak grip can easily spread the waist opening 23 when wearing the garment, and the wearing operation is easier than when the elongation stress of the part is high. On the other hand, since the lower

elastic regions

60B, 70B have a relatively high elongation stress, the portions stably fit to the body of the wearer and can exert a holding (hold) force required for the body. By forming the region of low extension stress and the region of high extension stress in the vertical direction of the diaper 10 and making them face each other in the front-rear direction Z in this manner, both the operability during wearing and the fit to the body can be achieved.

Referring to fig. 7 (a) and 7 (b), in the conventional diaper 110, the same elastic material in a string or strand shape is used as the rear waist elastic body in the rear waist region 112, the pitch between the 1 st rear waist elastic body 171 and the 2 nd rear waist elastic body 172 in the upper rear waist

elastic bodies

171 and 172 is different, and the pitch between the 2 nd rear waist elastic body 172 is larger than the pitch between the 1 st waist elastic bodies 171. In the diaper 110 of the comparative example having this structure, when the diaper 110 is lifted up to the buttocks 78 during wearing, the vicinity of the rear end edge 115b of the liquid-absorbent structure 115, that is, the upper elastic region 170A is bent to be caught on the step 79 between the thigh and the buttocks 78, and the lifting operation cannot be smoothly performed, in view of the difference in rigidity between the region where the liquid-absorbent structure 15 is present and the region located on the outer side in the longitudinal direction Y than this, the difference in the pitch between the 1 st rear waist elastic body 171 and the 2 nd rear waist elastic body 172, and the difference in the extension stress caused by this. In particular, in the diaper 110, since the rear end edge 115b of the liquid-absorbent structure 115 is positioned relatively close to the waist opening, most of the diaper 110 is not lifted up by hooking this portion, and if the user tries to lift up the diaper with difficulty, a part of the diaper 110 may break or a part of the crotch region 113 may be caught in a groin.

Referring to fig. 8 (a) and 8 (b), in the diaper 10 of the present embodiment, the upper elastic region 70A is entirely fitted to the body in a planar manner due to the same pitch between the 1 st rear waist elastic body 71 and the 2 nd rear waist elastic body 72, and the extension stresses of the elastic regions in which the 1 st rear waist elastic body 71 and the 2 nd rear waist elastic body 72 are disposed are also the same, so that the vicinity of the rear end edge 15b of the liquid-absorbent structure 15 does not bend and hooks on the step 79, and the lifting operation can be smoothly performed. In the present embodiment, since the pitch between the 3 rd rear waist elastic body 73 and the 2 nd rear waist elastic body 72 among the lower rear waist

elastic bodies

73 and 74 is also substantially the same as the pitch between the 1 st rear waist elastic body 71 and the 2 nd rear waist elastic body 72, the pitches between the respective elastic bodies are substantially the same for the necessary inner and outer dimensions in the longitudinal direction Y of the rear end edge 15b of the liquid-absorbent structure 15, and the bending of the portion during wearing can be further suppressed.

The 4 th rear waist elastic body 74 of the lower rear waist

elastic bodies

73, 74 is larger in size than the 1 st to 3 rd rear waist elastic bodies 71 to 73. Since the 4 th rear waist elastic member 74 overlaps the rear end portion 16B of the liquid-absorbent structure 15 in plan view and does not overlap the portion where the rigidity changes, the diaper 10 does not bend and hook over a step when lifted even if the separation dimension is relatively large.

Referring to fig. 4, the rear end portion 16B of the liquid-absorbent structure 15 is attached to the inner surface of the chassis 14 via the rear joint portion 59B in the elastic region where the 3 rd rear waist elastic body 73 is disposed, and the portion located between the rear end edge 51B of the liquid-absorbent core 51 and the rear joint portion 59B is not fixed to the inner surface of the chassis 14. As described above, since the entire rear end portion 16B is not attached to the chassis 14, the chassis 14 is less susceptible to a change in rigidity due to attachment of the liquid-absorbent structure 15, and the waist opening 23 is easily widened when worn.

Referring to fig. 6, the dimension R of separation in the longitudinal direction Y between the rear end edge 51b of the liquid absorbent core 51 and the elastic body of the 4 th rear waist elastic body 74 located on the side closest to the crotch region 13 is substantially equal to the dimension R of separation in the longitudinal direction Y between the adjacent 4 th rear waist elastic bodies 74, or the dimension R of separation is slightly larger than the dimension of separation in the longitudinal direction Y between the adjacent 4 th rear waist elastic bodies 74. Even in the vicinity of the rear end edge 51b of the semi-rigid liquid-absorbent core 51, the rigidity is likely to change, and when the difference between the separation dimension in the longitudinal direction Y of the 4 th rear waist elastic body 74 and the separation dimension R is relatively large, the separation portion may be bent and caught on a step when the lifting operation is performed while wearing the diaper 10. In the present embodiment, the dimension of separation in the longitudinal direction Y of the 4 th rear waist elastic body 74 is substantially equal to the dimension of separation R or the dimension of separation R is slightly larger than the dimension of separation in the longitudinal direction Y between adjacent 4 th rear waist elastic bodies 74, and the vicinity of the rear end edge 51b of the liquid-absorbent core 51 is not folded when the diaper 10 is lifted, so that the wearing operation can be performed smoothly.

Since the embossed pattern 28 in a lattice stripe shape defined by the plurality of 1 st and 2 nd

concave lines

29A, 29B is arranged on the outer surfaces of the front and

rear waist sheets

26, 27 forming the outer surfaces of the front and

rear waist regions

11, 12, gathers having different sizes are formed in conjunction with the gathers generated by the contraction action of the waist elastic body. Therefore, as compared with the case where the outer surfaces of the front waist region 11 and the rear waist region 12 are smooth, the front waist region 11 and the rear waist region 12 are easily gripped, and particularly, when the rear waist region 12 of the diaper 10 is gripped and lifted while being worn, the diaper is easily lifted in conformity to the hand of the wearer/the wearer. In addition, when the fibrous layer on the outer surface side of the front waist panel 26 and the rear waist panel 27 contains crimped fibers, the bulkiness of the non-compressed portions 30 increases, and a more comfortable feeling can be imparted to the wearer and the like.

The 1 st to 4 th rear waist elastics 71 to 74 of the rear waist region 12 are different in the dimension of separation in the longitudinal direction Y, but in any of these elastics, the dimension of separation is about 11mm or less. Since the plurality of elastic bodies are arranged with a relatively small separation dimension in this way, the rear end portion 16B of the liquid-absorbent structure 15 overlapped therewith in a plan view can be entirely attached to the body, and the bending of the separation portion between the waist elastic bodies can be suppressed during the wearing operation.

Referring to fig. 9 (a) and 9 (b), the conventional diaper 200 has a virtual line 280, which extends in the vertical direction H in the worn state, is parallel to the vertical center line bisecting the dimension 2 in the transverse direction, and passes through the apex 220 of the side seam 222. In the conventional diaper 200, the side seams 222 connecting both side edge portions of the front waist region 211 and the rear waist region 212 extend linearly in the vertical direction H along the imaginary line 280 in the worn state. In this worn state, for example, when the wearer holds the front waist region 211 and stretches it obliquely downward to widen the waist opening 223 in order to dispose an independent absorbent pad inside the diaper 200, the force F trying to stretch it obliquely downward acts on the entire side seam 222 extending along the imaginary line 280. Therefore, the entire rear waist region 212 is pulled obliquely forward and inclined to slide downward, and therefore, the rear waist opening edge is displaced downward from the virtual line 283 indicating the predetermined appropriate position. Therefore, when worn in such a state, not only the wearing feeling is impaired, but also there is a possibility that excrement leaks. In addition, when the position of the rear waist region 212 is corrected after the absorbent pad is inserted and disposed from the front waist region 211 side to the inside of the diaper 200, it is necessary to lift the rear waist region 212 to the predetermined virtual line 283 while adjusting the position of the absorbent pad, which takes labor and time.

Referring to fig. 10, the diaper 10 of the present embodiment has an imaginary line 80 extending in the vertical direction H, parallel to the longitudinal center line P bisecting the dimension 2 in the lateral direction, and passing through the apex 20 of the side seam 22. The side seams 22 connecting the side edge portions 11b of the front waist region 11 and the side edge portions 12b of the rear waist region 12 extend linearly in parallel with the virtual line 80 during production, and have a shape curved toward the rear waist region 12 with respect to the virtual line 80 in the worn state of the diaper 10. Specifically, the side seam 22 includes a 1 st portion 22A extending backward in a downward slope from the apex 20 and a 2 nd portion 22B bent from the 1 st portion 22A and extending forward in a downward slope, and intersecting the imaginary line 80 at an intersection 84.

Referring to fig. 11, when the wearer-assistant grips the front waist region 11 and stretches and spreads the waist opening 23 obliquely downward in order to dispose an independent absorbent pad inside the diaper 10, a force F that stretches the front waist region 11 obliquely downward acts on the side seams 22. At this time, since the side seams 22 have a curved shape with respect to the imaginary line 80, the 1 st portion 22A located above the curved portion 81 as a starting point is acted on by the tensile force F, and the portion of the rear waist region 12 on the waist opening 23 side is pulled diagonally forward. On the other hand, the 2 nd portion 22B located below the bent portion 81 cannot or is not easily subjected to the force F to be stretched, and is not stretched obliquely forward and largely slides off. Therefore, the entire rear waist region 12 is not pulled obliquely forward, and therefore, at least the center portion of the rear waist region 12 is located on the virtual line 83 indicating an appropriate position. Further, since the tensile force F acting on the 1 st portion 22A of the side seam 22 is dispersed in the cushion region 85 defined between the imaginary line 80 and the 1 st portion 22A, it is also considered that the rear waist region 12 can be suppressed from being pulled down.

In the diaper 10 of the present embodiment, the elastic region in which the 2 nd rear waist elastic body 72 is disposed and the elastic region in which the 2 nd front waist elastic body 62 is disposed in the rear waist elastic region are located at opposite positions in the front-rear direction Z of the diaper 10, and since the elongation stress of the former is higher than that of the latter, the side seam 22 is stretched toward the rear waist region 12 side at this portion and is formed in a curved shape with respect to the virtual line 80. In order to form the side seams 22 in this form, the difference between the extension stress of the elastic region in which the 3 rd rear waist elastic body 73 is disposed and the extension stress of the elastic region in which the 2 nd front waist elastic body 62 is disposed is preferably about 0.2N or more.

Further, a 3 rd front waist elastic body 63 is disposed in a front waist elastic region located below the 2 nd portion 22B of the side seam 22, and a 3 rd rear waist elastic body 73 is disposed in a rear waist elastic region opposed thereto. In the present embodiment, the separation dimension in the longitudinal direction Y of the mutually adjacent 3 rd front waist elastic 63 is smaller than the separation dimension in the longitudinal direction Y of the mutually adjacent 4 th rear waist elastic 74. Therefore, since the extension stress of the lower and front waist elastic regions is higher than the extension stress of the rear waist elastic region and the rear waist region 12 is stretched forward, the 2 nd portion 22B extends in a descending slope from the curved portion 81 so as to gradually separate from the imaginary line 80.

As long as the curved portion 81 is located rearward of the imaginary line 80, the side seams 22 may extend linearly from the apex 20 along the imaginary line 80 and then extend downward in a descending slope, and the intersection angle and inclination degree of the 1 st portion 22A and the 2 nd portion 22B with the imaginary line 80 may be appropriately changed. Further, when the front waist region 11 is pulled obliquely downward, the region located above the bent portion 81 is pulled downward, and therefore, when the bent portion 81 is located relatively lower, the portion of the rear waist region 12 that slides downward by the tensile force F becomes larger. Therefore, the curved portion 81 of the side seam 22 is preferably located above the central portion 11c (for convenience of description, the portion located at the central portion is indicated by a dot located on the imaginary line 80) of the dimension in the longitudinal direction Y of the rear waist region 12. By positioning the bent portion 81 above the central portion 11c in this manner, the entire rear waist region 12 can be prevented from slipping down. Further, the end edge (outer end edge 27b) of the folded portion 38 of the rear waist panel 27 is located at the curved portion 81 of the side seam 22. Since the rigidity varies due to the difference in the number of sheet members stacked in the rear waist region 12, it can be said that the side seams 22 are easily bent near the end edges (outer end edges 27b) due to the variation in rigidity. Further, since the embossed patterns 28 in a lattice-like pattern are arranged in the front waist region 11 and the rear waist region 12, the flexibility of the sheet member is increased, and the sheet member is easily deformed by the elongation force of the waist elastic body, so that the side seams 22 are more easily bent.

As described above, in the diaper 10 of the present embodiment, the side seams 22 extend linearly in parallel with the longitudinal center line P and the virtual line 80 during the manufacture, but the elongation stress of each elastic region passing through the front waist

elastic regions

60A, 60B and the rear waist

elastic regions

70A, 70B differs depending on the conditions of fineness, pitch and elongation ratio of the waist elastic body, and the finished product has a shape curved with respect to the virtual line 80, whereby it is possible to prevent the rear waist region 12 from being displaced when the diaper 10 is worn and when the absorbent pad is inserted, and to perform a smooth wearing operation.

The components constituting the diaper 10 of the present invention may be made of various known materials generally used for such articles, without limitation, other than the materials described in the specification. In the specification and claims, the terms "1 st", "2 nd", "3 rd" and "4 th" are used merely to distinguish similar elements, positions and the like.

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

A pull-on wearing article having a longitudinal direction and a transverse direction orthogonal to the longitudinal direction, and a vertical direction and a front-back direction orthogonal to the vertical direction in a worn state, the wearing article comprising: a longitudinal centerline bisecting dimension 2 in the transverse direction; a skin-facing surface and a non-skin-facing surface on a side opposite to the skin-facing surface; a front waist region; a rear waist region; side seams connecting both side edge portions of the front waist region and the rear waist region; the waist is opened; and a pair of leg openings, wherein the wearing article further includes an imaginary line extending parallel to the longitudinal centerline and passing through a vertex of an edge of the waist opening located at the side seam, and the side seam includes a 1 st portion extending rearward from the vertex in a downhill manner and a 2 nd portion extending forward from the 1 st portion in a curved manner in a downhill manner and intersecting the imaginary line.

A pull-on wearing article having a longitudinal direction and a transverse direction orthogonal to the longitudinal direction, and a vertical direction and a front-back direction orthogonal to the vertical direction in a worn state, the wearing article comprising: a longitudinal centerline bisecting dimension 2 in the transverse direction; a skin-facing surface and a non-skin-facing surface on a side opposite to the skin-facing surface; a chassis having a front waist region, a rear waist region, and a crotch region located between the front and rear waist regions; a liquid-absorbing structure mounted on the base; side seams connecting both side edge portions of the front waist region and the rear waist region; the waist is opened; and a pair of leg openings, wherein a rear waist elastic region which is stretchable in the transverse direction is located in the rear waist region, the liquid-absorbent structure includes a liquid-absorbent core having a rear end edge and a rear end portion extending outward in the longitudinal direction from the rear end edge of the liquid-absorbent core, and the rear waist elastic region includes: an upper elastic region extending from the waist opening to a position closer to the crotch region than a rear end edge of the liquid-absorbent structure, and provided with a plurality of upper rear waist elastic bodies extending in the transverse direction; and a lower elastic region disposed on the crotch region side of the upper elastic region and including a plurality of lower rear waist elastics extending in the transverse direction, wherein an extension stress of the upper elastic region is lower than an extension stress of the lower elastic region, the upper rear waist elastics are disposed at substantially equal intervals in the longitudinal direction, and a dimension of separation in the longitudinal direction of the mutually adjacent upper rear waist elastics is equal to a dimension of separation in the longitudinal direction of the mutually adjacent elastics located on the waist opening side of the lower rear waist elastics.

The invention disclosed in the above paragraphs 0053 and 0054 can include at least the following embodiments.

(1) The curved portion of the side seam is located above a central portion of the longitudinal dimension of the rear waist region.

(2) The front waist region has a front waist elastic region in which a plurality of front waist elastic bodies extending in the transverse direction are arranged, the rear waist region has a rear waist elastic region in which a plurality of rear waist elastic bodies extending in the transverse direction are arranged, and the extension stress of the rear waist elastic region opposing in the front-rear direction is higher than the extension stress of the front waist elastic region at the bent portion of the side seam.

(3) A separation dimension in the longitudinal direction of the mutually adjacent front waist elastic bodies is smaller than a separation dimension in the longitudinal direction of the mutually adjacent rear waist elastic bodies at a lower portion of the 2 nd portion of the side seam.

(4) The upper rear waist elastic body and the lower rear waist elastic body are interposed between an inner surface sheet located on the skin-facing surface side and an outer surface sheet located on the non-skin-facing surface side, the outer surface sheet has a bent portion bent inward in the longitudinal direction along a rear end edge of the inner surface sheet, and an end edge of the bent portion is located at a bent portion of the side seam.

(5) An embossed pattern in a lattice stripe shape including 1 st and 2 nd concave lines arranged with a plurality of compressed concave portions and crossing each other is arranged on outer surfaces of the front and rear waist regions.

(6) The dimension of separation in the longitudinal direction of the mutually adjacent rear waist elastic bodies is 11mm or less.

(7) The upper rear waist elastic body has a 1 st rear waist elastic body located on the waist opening side and a 2 nd rear waist elastic body located on the crotch region side of the 1 st rear waist elastic body, the lower rear waist elastic body has a 3 rd rear waist elastic body located on the waist opening side and a 4 th rear waist elastic body located on the crotch region side of the 3 rd rear waist elastic body, the fineness of the 1 st rear waist elastic body is smaller than the fineness of the other rear waist elastic bodies, and the dimension of separation in the longitudinal direction of the 4 th rear waist elastic bodies adjacent to each other is larger than the dimension of separation in the longitudinal direction of the other rear waist elastic bodies adjacent to each other.

Description of the reference numerals

10. Diapers (pull-on wearing articles); 11. a front waist region; 11a, 11b, side edge portions of the front waist region; 11c, a central portion of a dimension in the longitudinal direction of the front waist region; 12. a rear waist region; 12a, 12b, the lateral edge portion of the rear waist region; 13. a crotch region; 14. a substrate; 15. a liquid-absorbing structure; 16A, a rear end portion of the liquid-absorbent structure; 20. the vertex of the side seam; 22. performing side sewing; 22A, part 1 of the side seam; 22B, part 2 of the side seam; 23. the waist is opened; 24. a leg opening; 25. a base sheet (inner surface sheet); 27. a back waist sheet (outer surface sheet); 28. embossing patterns; 29A, 1 st concave line; 29B, 2 nd concave line; 38. a bending part; 62. a 2 nd front waist elastomer; 64. a 4 th front waist elastomer; 70A, an upper elastic region of the rear waist elastic region; 70B, a lower elastic region of the rear waist elastic region; 71. 1 st rear waist elastic body; 72. a 2 nd rear waist elastic body; 73. a 3 rd rear waist elastic body; 74. a 4 th back waist elastic body; 80. an imaginary line; 81. a curved portion; 84. the intersection between the side seam and the imaginary line; H. up and down direction; p, longitudinal center line; x, transverse direction; y, longitudinal direction; z, front-back direction.

Claims

1. A pull-on wearing article having a longitudinal direction and a transverse direction orthogonal to the longitudinal direction, and a vertical direction and a front-back direction orthogonal to the vertical direction in a worn state, the wearing article comprising: a longitudinal centerline bisecting dimension 2 in the transverse direction; a skin-facing surface and a non-skin-facing surface on a side opposite to the skin-facing surface; a chassis having a front waist region, a rear waist region, and a crotch region between the front and rear waist regions; a liquid-absorbing structure mounted on the base; side seams connecting both side edge portions of the front waist region and the rear waist region; the waist is opened; and a pair of leg openings, wherein,

the wearing article further has an imaginary line extending parallel to the longitudinal centerline and passing through an apex of an edge portion of the waist opening at the side seam,

the side seam has a 1 st portion extending backward in a downhill shape from the apex and a 2 nd portion extending forward in a downhill shape while being curved from the 1 st portion and intersecting the imaginary line,

wherein the front waist region has a front waist elastic region in which a plurality of front waist elastic bodies extending in the transverse direction are arranged, the rear waist region has a rear waist elastic region in which a plurality of rear waist elastic bodies extending in the transverse direction are arranged, and an elongation stress of the rear waist elastic region opposing in the front-rear direction is higher than an elongation stress of the front waist elastic region at a curved portion of the side seam,

a separation dimension in the longitudinal direction of the mutually adjacent front waist elastic bodies is smaller than a separation dimension in the longitudinal direction of the mutually adjacent rear waist elastic bodies at a lower portion of the 2 nd portion of the side seam.

2. The article of wear of claim 1,

the curved portion of the side seam is located above a central portion of the longitudinal dimension of the rear waist region.

3. The article of wear of claim 1 or 2,

the rear waist elastic body is interposed between an inner surface sheet located on the skin-facing surface side and an outer surface sheet located on the non-skin-facing surface side, the outer surface sheet has a bent portion bent inward in the longitudinal direction along a rear end edge of the inner surface sheet, and an end edge of the bent portion is located at a bent portion of the side seam.

4. The article of wear of claim 1 or 2,

an embossed pattern in a lattice stripe shape including 1 st and 2 nd concave lines in which a plurality of compressed concave portions are arranged and which intersect each other is arranged on an outer surface of the front waist region and an outer surface of the rear waist region.

5. The article of wear of claim 1 or 2,

the dimension of separation in the longitudinal direction of the mutually adjacent rear waist elastic bodies is 11mm or less.