WO2015068480A1

WO2015068480A1 - Disposable wearable article

Info

Publication number: WO2015068480A1
Application number: PCT/JP2014/075197
Authority: WO
Inventors: 秀晃槇; 瀧野　俊介; 克文青木
Original assignee: ユニ・チャーム株式会社
Priority date: 2013-11-09
Filing date: 2014-09-24
Publication date: 2015-05-14
Also published as: JP2015092946A; JP6296761B2

Abstract

Provided is a disposable wearable article having necessary fit properties about the torso of a wearer, and in which a rear waist area is not put out of position by movement of the wearer. A rear waist area (14) has a rear waist elastic area (40) in which a plurality of waist elastic bodies (51, 52, 53, 54) extending in a transverse direction (X) are arranged. The rear waist elastic area (40) has an underside portion (40B) positioned toward a crotch area (15), and the underside portion (40B) has an underside elastic area (42) positioned between lateral edges (17c) of the rear waist area (14). The underside elastic area (42) is joined with a side flap (70) so that the underside elastic area (42) and the side flap (70) are superposed on each other in plan view. The waist elastic bodies (51, 52, 53, 54) in the underside portion (40B) and leg elastic bodies (71) are superposed on each other in plan view, and the tensile stress in the underside elastic area (42) is lower than the tensile stress in the remaining portion of the rear waist elastic area (40).

Description

Disposable wearing items

The present invention relates to a disposable wearing article, in particular, a disposable wearing article such as a disposable diaper or a diaper cover having elasticity around a waist.

Conventionally, disposable wearing articles having elasticity around the waist are known. For example, Patent Literature 1 includes a waist panel that defines a front and rear waist region, and a liquid absorption structure that is attached to the inner surface of the waist panel. A plurality of waist elastic bodies extending in the lateral direction of the diaper are disposed in the front and rear waist regions, and leg elastic bodies extending in the longitudinal direction of the diaper are disposed at both side edges of the absorbent chassis.

JP 2001-178770 A (P2001-178770A)

In the diaper according to the invention disclosed in Patent Document 1, the elastic region by the waist elastic body in the rear waist region is formed of the upper elastic region, the intermediate elastic region, and the lower elastic region from the waist opening side to the leg opening side. It is divided into three, and the correlation of the elongation stress in each of the divided elastic regions is lower elastic region ≧ intermediate elastic region> upper elastic region. By setting the elongation stress of the lower elastic region to be the highest in the rear waist region, the fit of the diaper on the wearer's thigh is improved, and slipping with posture change and walking exercise is prevented. be able to.

However, in the case where the leg elastic body is arranged at the edge of the leg opening, when the elongation stress of the lower elastic area of the rear waist elastic area is set to be relatively high, the lower elastic area is affected by the contracting movement of the leg elastic body. In conjunction with this, the rear waist region is easily lowered. In particular, when the wearer is an infant, when the infant raises his buttocks and holds his toes in his mouth, or when making specific body movements such as crossing his legs while lying down, leg elasticity There is a problem that the lower elastic region is pulled by the body, the entire rear waist region moves so as to be displaced forward, and the dorsal side of the infant is exposed. In order to prevent such a disadvantage, when the elongation stress of the entire rear waist elastic region is lowered, there is a possibility that the holding force with respect to the waist circumference of the wearer is lowered.

An object of the present invention relates to provision of a disposable wearing article that has a required fit with respect to the wearer's waist and that can suppress displacement of the rear waist due to movement of the wearer.

In order to solve the above-described problems, the present invention provides a longitudinal direction and a transverse direction perpendicular thereto, a skin facing surface and a non-skin facing surface located on the opposite side, a front waist region, a rear waist region, and a front and back waist. A front and rear waist panel that defines the front and rear waist region, a liquid absorbing structure attached to the front and rear waist panel, and both side edges of the front and rear waist region The present invention relates to an improvement in a disposable wearing article that includes a defined waist opening and a pair of leg openings.

In the disposable wearing article according to the present invention, the liquid absorbing structure extends in the longitudinal direction disposed on the side flaps, the side flaps located on the outer sides in the lateral direction from the side edges of the absorbent body, and the side flaps. A plurality of leg elastic bodies, and the rear waist region has a rear waist elastic region in which the plurality of waist elastic bodies extending in the lateral direction are arranged, and the rear waist elastic region is on the crotch region side. The lower portion has a lower elastic region positioned between both side edges of the rear waist region, and the lower elastic region overlaps the side flaps in plan view. The waist elastic body and the leg elastic body in the lower portion overlap each other in a plan view, and the extension stress of the lower elastic region is the other stress of the rear waist elastic region. And wherein the lower than min tensile stress.

According to one or more embodiments of the disposable wearing article according to the present invention, the lower elastic region located between both side edges of the rear waist elastic region is joined to the side flap in a plan view, and The waist elastic body in the lower part overlaps with the leg elastic body arranged on the side flap in plan view. Thereby, an annular virtual elastic band is formed in the leg opening by the cooperation of the elastic bodies to improve the fit, and side leakage from the leg opening can be effectively prevented. In addition, since the extension stress of the lower elastic region is lower than the other parts between the both side edges of the rear waist region, the wearer's movement causes the rear waist region to move downward due to the extension force of the leg elastic body. Even if a force for pulling acts, it is possible to suppress displacement.

The drawings illustrate specific embodiments of the invention and include selective and preferred embodiments as well as the essential features of the invention.
The front view of the disposable diaper shown as an example of the disposable wearing article in 1st Embodiment of this invention. The partially broken expansion | deployment top view of a diaper in the state which extended each elastic body to the front-back direction of a diaper. The exploded perspective view of a diaper. The partially expanded view of the back waist area seen from the inner surface side in the state which developed the diaper. (A), (b) The figure which shows an example of the wearing operation | movement of the infant who is a wearer. The figure which shows the mode at the time of the measurement of the elongation stress of the test piece taken out from the diaper. The partially broken expansion | deployment top view of the diaper in an example of the example of a change of the diaper of 1st Embodiment. The partially broken expansion | deployment top view of the disposable diaper shown as an example of the disposable wearing article in 2nd Embodiment of this invention. The partially broken expansion | deployment top view of a diaper shown as an example of the example of a change of the diaper of 2nd Embodiment.

The following embodiments relate to the diaper shown in FIGS. 1 to 9 and include not only an indispensable structure of the invention but also a selective and preferable structure.
1 to 3, a disposable diaper 10 as an example of a disposable wearing article according to the present invention has a longitudinal direction Y and a lateral direction X, a skin facing surface and a non-skin facing surface facing it, and is elastic. The waist panel 11 and the liquid absorption structure 12 attached to the skin facing surface side of the waist panel 11 are included. The diaper 10 has a front waist region 13, a rear waist region 14, and a crotch region 15 located between the front and

rear waist regions

13 and 14.

<Waist panel>
The waist panel 11 includes a front waist panel 16 that forms the front waist region 13 and a rear waist panel 17 that forms the rear waist region 14. The front waist panel 16 has a substantially rectangular shape, intersects the front end portion 12A of the liquid absorbing structure 12, and extends in the horizontal direction X, and is spaced apart from the inner end edge 16a in the vertical direction Y. It is defined by an outer edge 16b extending in the horizontal direction X and both outer edges 16c extending in the vertical direction Y between the inner and

outer edges

16a, 16b. The rear waist panel 17 has a substantially trapezoidal shape, intersects with the rear end portion 12B of the liquid absorbing structure 12, and is opposed to the inner end edge 17a extending in the horizontal direction X and spaced apart from the inner end edge 17a in the vertical direction Y. The outer edge 17b extending in the lateral direction X, the outer edges 17c extending in the longitudinal direction Y between the inner edge 17a and the outer edge 17b, the outer edges 17c and the inner edges 17a, , And both inner edges 17d that are inclined. Here, the “front waist region 13” in the present embodiment means a region defined by the front waist panel 16, and the “rear waist region 14” means a region (described later) defined by the rear waist panel 17. It has a collar cover portion 29).

Both outer edges 16c of the front waist panel 16 and both outer edges 17c of the rear waist panel 17 facing each other in the front-rear direction in the wearing state are overlapped with each other and extend sideways 18 in the longitudinal direction Y. By connecting with each other, a waist opening and a pair of leg openings 20 are defined. In the side seam 18, the sheet material forming the front and

rear waist panels

16, 17 that overlap each other is fused by embossing / debossing by heat or ultrasonic waves (sonic). The rear waist region 14 has a dimension in the longitudinal direction Y larger than that of the front waist region 13, and has a buttock cover portion 29 extending from the side seam 18 toward the crotch region 15 side. The buttock cover portion 29 has a substantially trapezoidal shape that becomes gradually narrower from the rear waist region 14 side toward the crotch region 15 side, and has a size that can cover the wearer's buttock. Note that, as shown in other embodiments, the rear waist panel 17 may have a horizontally-long rectangular shape that does not include the heel cover portion 29, similar to the front waist panel 16.

<Front and rear waist panels>
Referring to FIG. 2, the front and

rear waist panels

16, 17 respectively extend in the lateral direction X, with

inner layer sheets

21, 22 positioned on the skin facing surface side,

outer layer sheets

23, 24 positioned on the non-skin facing surface side. For example, it includes a plurality of yarn-like, string-like or strand-like waist

elastic bodies

51, 52, 53, 54. The waist

elastic bodies

51, 52, 53, 54 are attached between the inner and

outer layer sheets

21, 22, 23, 24 so as to be shrinkable under extension by an appropriate adhesive, for example, a hot melt adhesive. The adhesive is applied to the inner and

outer layer sheets

21, 22, 23, 24 or the waist

elastic bodies

51, 52, 53, 54. The

outer layer sheets

23 and 24 are formed so that the dimension in the longitudinal direction Y is larger than that of the

inner layer sheets

21 and 22, and the

extension portions

23 a and 23 a positioned on the outer side in the longitudinal direction Y from the outer edge of the

inner layer sheets

21 and 22. 24a. The extending

portions

23a, 24a of the

outer layer sheets

23, 24 are provided with the liquid absorbing structure 12 on the skin facing surface of the waist panel 11, and absorb liquid via the outer edge (folded line) of the

inner layer sheets

21, 22. The structure 12 is bent toward the skin-facing surface and is fixed to the absorbent structure 12 and the

inner layer sheets

21 and 22.

The waist elastic body 51 is fixed between the extended

portions

23a and 24a of the

outer layer sheets

23 and 24 and a part of the

outer layer sheets

23 and 24 positioned facing the waist opening edge side. However, instead of forming the

extension portions

23a and 24a of the

outer layer sheets

23 and 24, for example, the

inner layer sheets

21 and 22 are the first inner layer sheet to which the waist elastic body 51 is fixed, and the waist

elastic bodies

52 and 53 are. Etc., the second inner layer sheet may be formed separately from the second inner layer sheet, and the first inner layer sheet may be disposed at a position where the extending

portions

23a and 24a of the

outer layer sheets

23 and 24 should be located.

<Each elastic region>
The front and

rear waist regions

13 and 14 are formed with front and rear waist

elastic regions

30 and 40 that can be expanded and contracted at least in the lateral direction X by the waist

elastic bodies

51, 52, 53, and 54, respectively. The upper

elastic regions

31, 41 extending in the lateral direction X on the side of the waist opening edges (

outer end edges

16b, 17b), the lower

elastic regions

32, 42 extending in the lateral direction X on the

inner end edges

16a, 17a, Intermediate

elastic regions

33, 43 located between the side

elastic regions

31, 41, 32, 42. In the upper

elastic regions

31, 41, the lower

elastic regions

32, 42, and the intermediate

elastic regions

33, 43, a plurality of waist

elastic bodies

51, 52, 53 extending in the lateral direction X are arranged, respectively. The intermediate elastic region 33 and the lower elastic region 32 of the front waist region 13, the lower elastic region 42 of the rear waist region 14, and a part of the intermediate elastic region 43 are from a pair of elastic regions that are spaced apart from each other in the lateral direction X. Each waist elastic body which is formed and is located in the center part of the transverse direction X of front and

rear waist regions

13 and 14 between them is arranged in the state where it is not arranged, or is made substantially inelastic

Inelastic regions

55 and 56 are defined. As described above, in the rear waist region 14, the inelastic region 56 is defined, so that the waist elastic body 52 positioned in the lower elastic region 42 overlaps the absorber 66 of the liquid absorbing structure 12 in plan view. In addition, at least a part of the waist elastic body 53 located in the intermediate elastic region 43 overlaps the absorber 66 in plan view.

Further, a waist elastic body 54 extending in the lateral direction X is disposed between the inner edges 17c of the rear waist region 14 (region of the buttock cover portion 29). In the illustrated embodiment, the waist elastic body 54 is formed from a single elastic material. However, a plurality of the waist elastic bodies 54 may be arranged, and in that case, the waist elastic bodies 54 may be arranged uniformly over the entire buttock cover portion 29. When the diaper 10 is worn, a gather 58 is formed in each elastic region by contraction of each waist elastic body (see FIG. 1).

Here, the front waist elastic region 30 means a region of the front waist region 13, that is, a region between both outer edges 16c of the front waist region 13, and the rear waist elastic region 40 means a region of the rear waist region 14. That is, it means a combination of a portion between both outer edges 17c and a portion (both cover portion 29) between both inner edges 17d. For convenience of explanation, the rear waist elastic region 40 is divided into an upper portion 40A composed of an upper elastic region 41 and an intermediate elastic region 43, and a lower portion 40B composed of a lower elastic region 42 and an elastic region of the buttock cover portion 29. It is divided.

The waist elastic body 51 has a fineness of about 470 to 940 dtex, and is stretched about 1.8 to 2.8 times, preferably about 2.0 to 2.4 times from the contracted or relaxed state. The waist elastic body 52 has a fineness of about 310 to 620 dtex, and is stretched about 1.6 to 3.5 times, preferably about 2.5 to 3.3 times from the contracted or relaxed state. The waist elastic body 53 has a fineness of about 310 to 780 dtex, and is stretched about 1.6 to 3.5 times, preferably about 2.5 to 3.3 times from the contracted or relaxed state. The waist elastic body 53 has a fineness of about 310 to 780 dtex, and is stretched about 1.6 to 3.5 times, preferably about 2.5 to 3.3 times from the contracted or relaxed state. Each of the waist

elastic bodies

51, 52, 53 can use, for example, a thread-like, string-like or strand-like elastic material.

In the rear waist region 14, the waist elastic body 52 has smaller fineness and expansion ratio than the waist

elastic bodies

51 and 53, and the extension stress of the lower elastic region 42 is applied to the other

elastic regions

41 and 43. It is lower than that. Specifically, the upper elastic region 41 has an elongation stress of about 171% when stretched at a predetermined width (30 mm width) of each elastic region (71% when the maximum stretched dimension is 100%). .7 to 1.7 N / 30 mm, the middle elastic region 43 is 0.4 to 1.4 N / 30 mm, and the lower elastic region 42 is about 0.2 to 1.2 N / 30 mm. The upper elastic region 41 ≧ the intermediate elastic region 43> the lower elastic region 42. However, as in the present embodiment, in addition to the correlation of the elongation stress by adjusting the fineness, it is also possible to appropriately adjust the separation size, the number, etc. of the elastic material so as to achieve this correlation. .

Referring to FIGS. 2 and 3, the liquid absorbing structure 12 has a vertically long and substantially rectangular shape, and includes a front end portion 12 A connected to the skin facing surface of the front waist panel 16 via a bonding area 61, and a rear waist panel. The rear end portion 12B is connected to the skin facing surface 17 through the joining region 62, and the intermediate portion 12C extends in the longitudinal direction Y between the front and

rear end portions

12A and 12B and forms the crotch region 15. The joining

areas

61 and 62 are formed by a known adhesive means such as an appropriate adhesive, for example, a hot melt adhesive, and have a plurality of lines extending in the longitudinal direction Y. As the application pattern of the joining

areas

61 and 62, various known ones can be adopted as appropriate, but when a hot melt adhesive is applied to the entire inner surface of the liquid absorbing structure 12 and the waist panel 11, Since flexibility is impaired, it is preferable to be partially connected, and in addition to a line shape, a spiral shape or a dot shape may be used.

2 and 3, the liquid-absorbing structure 12 includes a liquid-permeable body-side liner 63 positioned on the skin facing surface side, a hydrophobic covering sheet 64 positioned on the non-skin facing surface side, and a space therebetween. And a pad-like liquid-absorbing absorber 66 interposed therebetween. The bodyside liner 63 can be, for example, the mass of about 15 ~ 25 g / ^{m 2} hydrophilized spunbonded fibrous nonwoven fabric may be formed from a SMS fibrous nonwoven fabric or the like. The covering sheet 64 is formed of a hydrophobic SMS fiber nonwoven fabric or spunbond nonwoven fabric having a mass of about 10 to 20 g / m ² . Between the covering sheet 64 and the absorber 66, a leak-proof film 67 made of a plastic film having a gas permeability of about 10 to 25 g / m ² is disposed. The liquid absorbing structure 12 is an end flap formed by a part of the body side liner 63, the covering sheet 64, and the leak-proof film 67 that extends outward in the longitudinal direction Y from the front and rear end edges 66a and 66b of the absorber 66. 69 and side flaps 70 formed from a part of these sheets extending outward in the lateral direction X from both side edges of the absorbent body. The side flap 70 has front and

rear end portions

70A and 70B joined to the front and

rear waist panels

16 and 17 via

joint regions

61 and 62, and the front and

rear end portions

70A and 80B are flat with the lower

elastic regions

32 and 42, respectively. They overlap each other in view.

A part of the both sides of the covering sheet 64 is bent and fixed inward, and the fineness extending in the longitudinal direction Y is between the bent portion and the covering sheet 64 facing it. Leg elastic body 71 formed of a plurality of, for example, a thread-like, string-like or strand-like elastic material having a length of about 300 to 500 dtex and stretched about 1.8 to 3.2 times from a contracted or relaxed state Is placed. The leg elastic body 71 has, for example, a fineness smaller than that of each waist elastic body and a high expansion ratio, and has a relatively weak extension force, and is easily extended in the longitudinal direction Y. It has become. When the fineness of the leg elastic body 71 is about 500 dtex or more, the fineness is larger than that of each waist elastic body, and there is a possibility that the effects of the present invention described later may not be achieved, while the fineness of the leg elastic body 71 is about 300 dtex. In the following cases, the fitting property of the side flap 70 is lowered, and there is a possibility that a gap that causes a side leakage of excrement is formed between the side flap 70 and the body.

The absorbent body 66 has front and rear end edges 66a and 66b located in the front and

rear waist regions

13 and 14, and concave side edges extending in the longitudinal direction Y between the front and rear end edges 66a and 66b. An absorbent core formed from an absorbent material such as superabsorbent polymer particles, and a liquid-permeable core wrap sheet formed from tissue paper having a mass of about 10 to 20 g / m ² covering the entire absorbent core; including.

Referring to FIG. 4, each

elastic region

41, 42, 43 located between both side edges 17 c of the rear waist region 14 has a width dimension that equally divides the length Y of the side edge 17 c of the rear waist region 14. Have. Specifically, the length dimension in the longitudinal direction Y of the side edge 17c of the rear waist panel 17 is about 60 to 180 mm, and the dimension (width dimension) in the longitudinal direction Y of each

elastic region

41, 42, 43 is about 20 to 60 mm.

Thus, the width dimension of each elastic region is obtained by dividing the longitudinal dimension Y of the side edge 17c into three equal parts. For example, if the arrangement of each elastic region is described from the aspect of the diaper 10 as a whole, the upper side The elastic region 41 is located between the outer edge 17 b of the rear waist region 14 and the outer edge of the liquid absorbing structure 12, and the intermediate elastic region 43 is formed between the rear edge of the liquid absorbing structure 12 and the absorber 66. The lower elastic region 42 overlaps (intersects) the end flap 69 and the rear end part of the absorber 66, and is positioned so as to overlap (intersect) the end flap 69 positioned between the rear end edge 66b. Is located).

Further, in the rear waist elastic region 40, the lower elastic region 42 and the side flap 70 are joined to each other in a plan view. In this way, the lower elastic region 42 and the side flap 70 intersect each other, whereby the lower elastic region 42 and the elastic region by the flap elastic body 71 on which the extension force of the leg elastic body 71 acts cooperate. Since a virtual annular elastic band is formed around the wearer's leg, leakage of excrement from the leg can be suppressed. However, even if the rear end edge of the leg elastic body 71 is located on the inner side in the longitudinal direction Y with respect to the lower end of the side seam 18 and does not extend to the lower elastic region 42, it does not extend to the collar cover portion 29. By intersecting only with the waist elastic body 54 positioned, the same effect can be obtained. That is, such an effect can be achieved by intersecting any one of the waist elastic bodies arranged in the lower portion 40B.

Referring to FIGS. 5 (a) and 5 (b), when the wearer of the diaper 10 is an infant, the waist is lifted in the supine state, the toes are held in the mouth, the legs are crossed in the lying state, etc. There may be a specific action. When such an operation is performed, the lower elastic region 42 is pulled by the extension force of the leg elastic body 71, the entire rear waist region 14 moves so as to be displaced forward, and the back side of the infant is exposed. There is a problem such as.

In such a case, if the extension stress of the lower elastic region 42 that overlaps the side flap 70 in plan view is relatively higher than that of the upper portion 40A (upper elastic region 41 and intermediate elastic region 43), When the elongation stress of the portion 40A is relatively low, the holding force with respect to the waist of the wearer is reduced. Further, the waist elastic body extending in the lateral direction X with respect to the side flap 70 extending in the vertical direction Y when the leg elastic body 71 disposed on the side flap 70 is pulled forward by movement around the leg of the wearer. 52 overlap each other at right angles, even if the elongation stress of the waist elastic body 52 is relatively high, the waist elastic body 52 is easily pulled downward, and when the lower elastic region 42 having a high elongation stress is displaced, the elongation stress is higher than that. The low middle elastic region 43 and the upper elastic region 41 are shifted in conjunction with each other. Therefore, when the leg elastic body 71 is contracted by the movement of the wearer and the lower elastic region 42 to which the side flaps 70 are fixed is pulled downward, the entire rear waist region 14 slides down, and the back surface of the wearer is external. There is a risk of exposure.

In particular, the diaper 10 of the present embodiment is composed of separate front and

rear waist panels

16 and 17 that define the front and

rear waist regions

13 and 14 and the liquid absorbing structure 12 fixed to the inner surfaces thereof. However, in the case of a diaper having such a configuration, the leg elastic body 71 positioned on the side flap 70 is provided around the wearer's leg as compared to the case where the entire outer shape of the diaper is formed from an integral sheet member. There is a structural problem in that the front and

rear waist panels

16 and 17 are easily pulled to the crotch region 15 side by the contraction action when contracted due to the movement of the head.

In this embodiment, between the both side edges 17c of the rear waist region 14, without joining the side flap 70 which can be contracted by the leg elastic body 71 to the upper portion 40A that should exhibit the required waist holding force, Only the lower elastic region 42 is joined via the regions 60 and 61, whereby the extension force by the leg elastic body 71 is buffered (dispersed) by the lower elastic region 43. That is, in the rear waist elastic region 40, the upper portion 40A can be stably fitted to the waist of the wearer by setting the extension stress of the upper portion 40A to be higher than the extension stress of the lower portion 40B. When the extension force of the leg elastic body 71 acts on the lower elastic region 42 having a relatively low extension stress, the lower elastic region 42 is easily extended and pulled downward. Therefore, the extension force from the leg elastic body 71 can be buffered, and the shift of the entire rear waist region 14 is suppressed.

By relatively increasing the extension stress of the upper portion 40A located opposite from the most protruding portion of the wearer's buttocks to the waist that is constricted, the lower elastic region 42 tends to pull it downward. Even if a large force is applied to the upper waist portion 40, the upper portion 40 A is positioned so as to be hooked on the upper end of the heel portion, thereby preventing a large displacement of the rear waist region 14. As described above, in order for the upper portion 40A to achieve the required holding force, the waist

elastic bodies

51 and 53 are evenly arranged in almost the entire region of the upper elastic region 41 and the intermediate elastic region 43 constituting the upper portion 40A. It is preferable that Since the entire upper portion 40A has the required fit evenly, it is possible to effectively prevent leakage from the back side of the soft stool peculiar to infants.

Further, it is preferable that the extension force of the elastic region by the leg elastic body 71 is equal to or lower than the extension force of the upper portion 40A of the rear waist elastic region 40. In such a case, even if the extension force of the leg elastic body 71 buffered by the lower portion 40B acts on the upper portion 40A, the upper portion 40A can be reliably prevented from being pulled downward. As described above, in order to relatively reduce the extension force of the elastic region by the leg elastic body 71, it is necessary to appropriately adjust the fineness, the number, the separation dimension, and the like of the leg elastic body 71. That is, the waist elastic bodies and the leg elastic bodies 71 may be formed from the same elastic material, the arrangement intervals (pitch) between the elastic materials may be the same, and only the fineness may be different, or the fineness may be the same. Only the pitch may be made different. In the present embodiment, the leg elastic body 71 has a smaller fineness than the waist

elastic bodies

51, 52, 53, 54, and more preferably has a high expansion ratio. Is stretched around the leg. Therefore, even if the size of the wearer's leg is relatively large, it fits easily along the leg, so that there is a gap between the body and the side flap 70 that causes side leakage of excrement. It can suppress that it forms between.

Furthermore, it is preferable that the correlation of the elongation stress in each of the

elastic regions

41, 42, 43 of the rear waist elastic region 40 is an upper elastic region 41 ≧ intermediate elastic region 43> lower elastic region 42. In such a case, since the extensional stress of the upper elastic region 41 that contacts the wearer's waist is set to be the highest, it is stably fitted to the constricted portion of the wearer's waist in this region, and the position shift Can be effectively prevented.

Further, the front waist elastic region 30 preferably has the same correlation of elongation stress as that of the rear waist elastic region 40, and specifically, the correlation of the elongation stress in each elastic region in the front and

rear waist regions

13,14. The relationship is upper elastic region 31 ≧ middle elastic region 33 ≧ lower elastic region 32. In such a case, since the elongation stress of the lower

elastic regions

32 and 42 is the lowest in the front and

rear waist regions

13 and 14, the shrinkage rate of the leg opening edge on the front waist region 13 side is reduced, and the leg openings are compared. Large in size. Therefore, when the diaper 10 is worn, it becomes easy to insert the tip of the foot into the leg opening, and the wearing operation can be made smooth.

More preferably, in the contrast between the elongation stress of the entire front waist elastic region 30 and the elongation stress of the portion located between the two outer edges 17c of the rear waist elastic region 40, the latter is larger than the former. is there. In such a case, the front waist region 13 is easily extended along the abdomen of the wearer bulging in a convex shape, while the rear waist region 14 is more strongly fitted to the flat back side, so that the entire diaper 10 Misalignment can be suppressed.

As described above, the waist elastic body 52 positioned in the lower elastic region 42 does not overlap the absorber 66 in plan view, and at least a part of the waist elastic body 53 positioned in the intermediate elastic region 43 is absorbed. It overlaps with the sex body 66 in plan view. Therefore, in the lower elastic region 42, the contraction force of the waist elastic body 52 is not directly applied to the absorbent body 66, and the absorbent body 66 is not in close contact with the wearer's body, while in the intermediate elastic region 43. The absorber 66 is fitted to the wearer's body by the contraction force of the waist elastic body 53. As a result, even if the infant takes a posture as shown in FIG. 5A, the movement around the legs is not restricted by the absorbent body 66, while the absorbent body 66 is fitted around the waist. Misalignment is unlikely to occur.

<Method for measuring elongation stress>
As shown in FIG. 6, the tensile stress in each elastic region of the front and rear waist

elastic regions

30 and 40 was measured by the following method using a tensile tester 76 (INSTRON model: 5564) manufactured by Instron Japan Company Limited. . First, in the tensile testing machine 76, the separation distance R between the upper chuck (movable tool) 77 and the lower chuck (fixing tool) 78 is the dimension in the transverse direction X in the natural state of the diaper (the side seams 18 of the front and rear waist regions 13, 14). The cycle mode was adopted and the tensile speed was set to 100 mm / min.

Next, the measurement specimen 79 is cut out from the diaper 10 and stretched in the lateral direction X until the gathers generated by the stretching force of each waist elastic body are eliminated, and the dimension between the side seams 18 in this state is maximized. The dimension R1 (not shown) at the time of extension was used. The specimen 79 used for the measurement of the maximum dimension R1 was not used for the measurement of the extension stress itself. Next, both side edges of the specimen 79 cut from the diaper 10 were fixed to the upper and

lower chucks

77 and 78, respectively. In this state, the specimen 79 was pulled upward so that the upper and

lower chucks

77 and 78 were separated from each other, and the specimen 79 was extended to a required length.

Further, assuming that the dimension R1 at the maximum extension measured in advance is 100%, the measurement is started from the distance R between the chucks, and the specimen 79 is extended until the distance between the

chucks

77 and 78 is about 187% of the maximum dimension R1. I let you. Next, the specimen 79 extended to about 187% of the maximum dimension R1 is gradually contracted, and the extensional stress is measured when the distance between the upper and

lower chucks

77 and 78 is about 171% of the maximum dimension R1. Based on the width of the specimen 79, a value converted into a value per unit width (30 mm) was taken as a measured value (N / 30 mm).

<Method for measuring elongation force>
The tensile tester used for measuring the extension stress was used to measure the extension force between the

elastic regions

42, 43, 44 of the rear waist elastic region 40 and the elastic region expanded and contracted by the leg elastic body 71. For each

elastic region

42, 43, 44, for a portion that does not overlap the liquid absorbing structure 12, a specimen having a length of 3 to 5 cm in the lateral direction X is cut out from the portion, and the specimen is in a natural state. A pair of marked lines with a separation dimension of 2 cm in the direction X was entered, and the extension force when the separation dimension was expanded to 1.7 times was obtained and compared. It measured similarly about the elastic range which the contraction effect | action of the leg elastic body 71 reaches. In addition, when the dimension of the longitudinal direction Y of the diaper 10 which is the width dimension in each test piece is not constant, each extension stress when converted to a value in the case of a width of 30 mm for each test piece The specimens were compared.

<Example of change>
FIG. 7 is a plan view similar to FIG. 2 showing an example of a modified example of the diaper 10. In this modified example, the front and rear waist

elastic regions

30 and 40 are divided into four substantially equally. Specifically, the front waist elastic region 30 is divided into an upper elastic region 31, a first intermediate region 33 A, a second intermediate region 33 B, and a lower elastic region 32, and is opposed to the front waist region 13. A region between the outer edges 17c of the elastic region 40 is divided into an upper elastic region 41, a first intermediate region 43A, a second intermediate region 43B, and a lower elastic region 42. As described above, even when the region between both side edges of the rear waist elastic region 40 is equally divided into three or more regions, the lower elastic region 42 to which the side flaps 70 are joined. Is set so as to be lower than that of other elastic regions, thereby preventing back slipping during wearing.

Second Embodiment
FIG. 8 is a developed plan view of the diaper 10 according to the second embodiment of the present invention. Since the basic configuration of the diaper 10 is the same as that of the first embodiment, only differences will be described below.

8 and 9, in this embodiment, the diaper 10 includes an elastic waist panel 11, a liquid absorbing structure 12 connected to the skin-facing surface side of the elastic waist panel 11, and an elastic waist panel 11. And a crotch panel 80 attached to the non-skin facing surface. The dimension of the crotch panel 80 in the vertical direction Y is smaller than that of the liquid absorbing structure 12, and the front and rear ends 12 A and 12 B of the liquid absorbing structure 12 are longer than the front and rear fixed ends 80 A and 80 B. It extends to the outside in the direction Y and is attached to the inner surfaces of the front and

rear waist panels

16 and 17. Unlike the first embodiment, the front and

rear waist panels

16 and 17 constituting the waist panel 11 are both horizontally long rectangular, and the rear waist elastic region 40 is located only in a region between both side edges 17c of the rear waist panel 17. To do.

The crotch panel 80 has a liquid-impermeable crotch sheet 81 that forms the entire outer shape thereof. The crotch sheet 80 may be a single-layer or multi-layer sheet member formed of various known fiber nonwoven fabrics or plastic films. When the crotch sheet 81 is formed of a plurality of layers, for example, two layers consisting of an inner and outer layer, the inner layer is located opposite to the liquid-absorbing structure 12, and therefore preferably formed from a leak-proof plastic film. Since the outer layer constitutes a part of the outer surface of the diaper 10, it is preferable to form the outer layer from a fiber nonwoven fabric that has a better feel than a plastic film.

The crotch panel 80 has front and rear

fixed end portions

80A and 80B and an intermediate portion 80C positioned between the front and rear

fixed end portions

80A and 80B. The front and

rear end portions

80A and 80B are located on the inner end edge side of the front and

rear waist panels

16 and 17 via a joining region 88 formed by applying an appropriate adhesive, for example, a hot melt adhesive, located on the non-skin facing surface side. Fixed to the skin facing surface. The intermediate portion 80C is fixed to the liquid absorbing structure 12 located on the skin facing surface side.

The crotch panel 80 also has a pair of elastic side flaps 81 located on the outer side in the lateral direction X from both side edges of the liquid absorbing structure 12. The side flap 81 includes a bent portion formed by bending both side portions of the crotch sheet 81, and a plurality of, for example, thread-like, string-like or strand-like leg elastic bodies extending in the longitudinal direction Y arranged in the bent portion. 83. The front and rear end portions of the side flap 81 (a part of the front and rear

fixed end portions

80A and 80B of the crotch panel 80) are fixed outward in the lateral direction X. The side flap 81 is positioned outside the flap inelastic region 85 located between the side edge of the liquid absorbing structure 12 and the innermost elastic body of the leg elastic body 83, and the lateral direction X of the flap inelastic region 85. And a flap elastic region 86 in which a leg elastic body 83 is disposed. As described above, the side flap 81 is fixed outward in the lateral direction X, and the flap inelastic region 85 is positioned on the liquid absorption structure 12 side of the flap elastic region 86, so that the side flap 81 stands upright. The flap elastic region 86 abuts on the body in a planar shape. Therefore, unlike the case where it is fixed inward in the lateral direction X, there is no risk of falling inward and being pinched between the wearer's thighs.

In the diaper 10 according to the present embodiment, the elastic band-shaped side flaps 81 are arranged on both sides of the crotch region 15, so that the fit to the wearer's thigh is improved, and the side leakage of excrement occurs. It can be prevented more effectively. In addition, as described above, the front and rear

fixed end portions

80A and 80B of the crotch panel 80 are joined to the lower

elastic regions

32 and 42 of the front and

rear waist panels

16 and 17, and the lower sides of the front and

rear waist regions

13 and 14 are connected. The waist elastic body 52 and the leg elastic body 83 located in the

elastic regions

32 and 42 overlap each other in plan view. Further, as in the first embodiment, in the rear waist elastic region 40, the elongation stress of the lower elastic region 42 is set lower than that of the other

elastic regions

41, 43, thereby the rear in the wearing state. The waist region 14 is prevented from sliding down.

FIG. 9 is a developed plan view of the diaper 10 in an example of a modification of the second embodiment. Referring to FIG. 9, in this embodiment, the crotch panel 90 is disposed on the base sheet 91 having a slightly larger size in the vertical direction Y and the horizontal direction X than the liquid absorbing structure 12 and the inner surface of the base sheet 91. The liquid absorbing structure 12 and a leg elasticizing sheet 92 which is a separate body and is fixed to both side edges of the base sheet 91. The leg elasticization sheet 92 has a plurality of, for example, a thread-like, string-like, or strand-like leg elastic body 93 and a cover sheet 94 that covers the leg elastic body 93, thereby forming an elastic side flap 95. The The cover sheet 94 is formed of a single fiber nonwoven fabric or plastic film, and is fixed to the base sheet 91 at the joint portion 96 via a hot-melt adhesive in a state of being folded in half. Is fixed in a stretched state in a folded portion where the cover sheet 94 is bent and fixed via an appropriate adhesive applied to the entire periphery, for example, a hot melt adhesive. The leg elasticized sheet 92 is fixed to the base sheet 91 positioned in the inner side in the horizontal direction X in a state where the leg elasticized sheet 92 is contracted in the vertical direction Y as a whole, and a plurality of wrinkles are formed.

The dimension in the longitudinal direction Y of the crotch region 13, that is, the separation dimension L1 in the longitudinal direction Y between the inner end edge 16a of the front waist region 13 and the inner end edge 17a of the rear waist region 14 is 200 to 280 mm. The effective extension dimension L2 at the maximum extension of the plasticized sheet 92 is preferably about 210 to 420 mm. Here, the effective extension dimension L2 is the inner end edge 16a of the front waist region 13 and the inner end of the rear waist region 14 excluding the front and

rear end portions

93a and 93b that are fixed to the front and

rear waist regions

13 and 14 and do not substantially extend. The vertical dimension of the part which can be elastically expanded-contracted in the vertical direction Y of the leg elasticization sheet | seat 92 located between the edges 17a is said. Therefore, the leg elasticized sheet 92 is at least 1.05 times, preferably 1.05 to 1.5 times, more preferably 1.1 to 1.4 times the dimension L1 in the longitudinal direction Y of the crotch region 15. It is only elastically extensible.

In this way, the leg elasticized sheet 92 is attached to the liquid absorbing structure 12 in a contracted state, and the side flap 95 is formed with a plurality of ridges. Even if it is extended to the extent that wrinkles disappear, a force having such a size as to try to slide it downward is not applied to the front and

rear waist regions

13 and 14, and the front and rear waist regions are more reliably 13 and 14 can be prevented from sliding down.

In addition, in a diaper in which the front and

rear waist regions

13 and 14 and the crotch region 15 are formed as separate bodies, when the leg elastic body 93 is attached in an extended state so that it can expand and contract, Sufficient tensile strength does not act on the body, and the leg elastic body 93 may be pulled inward due to the influence of the movement of the thigh of the wearer, and may be caught in the wearer's rupture. In the present embodiment, since the leg elasticized sheet 92 is attached in a contracted state, the leg elasticized sheet 92 is sufficiently stretched along the thigh of the wearer at the time of wearing so that the required tensile strength is obtained. Demonstrates a stable fit to the thigh.

As the constituent materials constituting the diaper 10 of the present invention, various known materials that are usually used in this type of field can be used without limitation, unless otherwise specified. Further, terms such as “first” and “second” used in the present specification are merely used to distinguish similar elements, positions, and the like.

The disclosure relating to the present invention described above can be organized into at least the following matters.
It has a longitudinal direction and a transverse direction perpendicular thereto, a skin facing surface and a non-skin facing surface located on the opposite side, a front waist region, a rear waist region, and a crotch region located between the front and rear waist regions. A front and rear waist panel that defines the front and rear waist region, a liquid absorbing structure attached to the front and rear waist panel, and a waist opening and a pair of leg openings defined by connecting both side edges of the front and rear waist region The absorbent structure includes: an absorbent body; side flaps located on the outer sides in the lateral direction from both side edges of the absorbent body; and a longitudinal direction disposed on the side flaps. A plurality of leg elastic bodies, and the rear waist region has a rear waist elastic region in which the plurality of waist elastic bodies extending in the lateral direction are arranged, and the rear waist elastic region is It has a lower part located on the crotch region side, the lower part has a lower elastic region located between both side edges of the rear waist region, and the lower elastic region is flat with the side flaps. The waist elastic body and the leg elastic body in the lower portion overlap each other in plan view, and the elongation stress of the lower elastic region is different from that of the rear waist elastic region. It is characterized by being lower than the elongation stress of this part.

The present invention disclosed in the above paragraph 0054 can include at least the following embodiments. The embodiments can be adopted separately or in combination with each other.
(1) The rear waist elastic region is positioned between the lower elastic region, the upper elastic region located on the waist opening side, and the upper and lower elastic regions, which are equally divided between the side edges. The upper elastic region and the intermediate elastic region are higher in extension stress than the lower elastic region, respectively, and the upper elastic region and the intermediate elastic region are extended. The force is larger than the longitudinal extension force of the elastic region by the leg elastic body.
(2) The correlation of the elongation stress of a predetermined width in the upper elastic region, the intermediate elastic region, and the lower elastic region is upper elastic region ≧ intermediate elastic region> lower elastic region.
(3) The extension force of the elastic region by the leg elastic body is equal to or less than the extension force of the upper portion extending from the lower portion of the rear waist elastic region to the waist opening side.
(4) The waist elastic body located in the lower elastic region does not overlap with the absorbent core in plan view, and at least a part of the rear waist elastic body located in the intermediate elastic region is the The absorbent core overlaps with each other in plan view.
(5) The fineness of the leg elastic body is smaller than the fineness of the waist elastic body, and the elongation rate of the leg elastic body is higher than the elongation rate of the waist elastic body.
(6) The front waist region has at least a front waist elastic region that can be expanded and contracted in the lateral direction, and the front waist elastic region is an upper elastic region that is positioned opposite to the upper elastic region of the rear waist region. The lower elastic region located opposite the lower elastic region of the rear waist region, and the intermediate elastic region opposed to the intermediate elastic region of the rear waist region, and the upper elastic region in the front waist region And the correlation of the extensional stress of a predetermined width in the intermediate elastic region and the lower elastic region is upper elastic region ≧ intermediate elastic region ≧ lower elastic region.
(7) The side flap includes front and rear end portions fixed outward in the lateral direction in the front and rear waist region, an inelastic region extending outward in the lateral direction from a side edge of the liquid absorbing structure, And an elastic region extending outward in the lateral direction from the non-elastic region.
(8) It further has a crotch panel having a base sheet on which the liquid absorbing structure is disposed, and a leg elasticized sheet joined to both sides of the base sheet, and the leg elasticized sheet is in a contracted state. Bonded to the base sheet, the effective extension dimension at the maximum extension of the leg elasticized sheet is larger than the separation dimension in the longitudinal direction from the inner end edge of the front waist region to the inner end edge of the rear waist region. large.
(9) The elongation stress at 71% at the maximum extension of the upper elastic region is about 0.7 to 1.7 N / 30 mm, and the extension stress is about 0.4 to 1 at 71% at the maximum extension of the intermediate elastic region. .4 N / 30 mm, 71% elongation stress at the maximum elongation of the lower elastic region is about 0.2 to 1.2 N / 30 mm.

10 Disposable wearing articles (disposable diapers)
12 Liquid-absorbing structure 13 Front waist region 14 Rear waist region 15 Crotch region 16 Front waist panel 17 Rear waist panel 19 Waist opening 20 Leg opening 30 Front waist elastic region 31 Upper elastic region 32 of front waist elastic region 32 Lower elastic region 33 Intermediate elastic region 40 of the front waist elastic region Rear waist elastic region 40A Upper portion 40B of the rear waist elastic region Lower portion 41 of the rear waist elastic region Upper elastic region 42 of the rear waist elastic region Lower elastic region 43 Intermediate elastic region 51 of the rear waist elastic region Waist elastic member 52 Waist elastic member 53 Waist elastic member 54 Waist

elastic member

70, 81, 95 Side flap 71 Leg elastic member 90 Crotch panel 91 Base sheet 92 Leg elasticization Seat L1 From the inner edge of the front waist area to the inner edge of the rear waist area Longitudinal dimension up to L2 Effective stretch dimension at maximum stretch of leg elasticized sheet X Horizontal direction Y Vertical direction

Claims

It has a longitudinal direction and a transverse direction perpendicular thereto, a skin facing surface and a non-skin facing surface located on the opposite side, a front waist region, a rear waist region, and a crotch region located between the front and rear waist regions. A front and rear waist panel that defines the front and rear waist region, a liquid absorbing structure attached to the front and rear waist panel, and a waist opening and a pair of leg openings defined by connecting both side edges of the front and rear waist region In disposable wearing articles including
The liquid-absorbing structure includes an absorbent body, side flaps positioned laterally outward from both side edges of the absorbent body, and a plurality of leg elastic bodies extending in the vertical direction disposed on the side flaps. ,
The rear waist region has a rear waist elastic region in which a plurality of waist elastic bodies extending in the lateral direction are arranged,
The rear waist elastic region has a lower part located on the crotch region side,
The lower part has a lower elastic region located between both side edges of the rear waist region,
The lower elastic region is joined to the side flaps in an overlapping manner in plan view,
The waist elastic body and the leg elastic body in the lower portion overlap each other in plan view;
The wearing article, wherein an extension stress of the lower elastic region is lower than an extension stress of other portions of the rear waist elastic region.
The rear waist elastic region is equally divided between the side edges, the lower elastic region, the upper elastic region located on the waist opening side, and the intermediate elasticity located between the upper and lower elastic regions. The upper elastic region and the intermediate elastic region are higher in extension stress than the lower elastic region, respectively, and the upper elastic region and the intermediate elastic region have an extension force of The wearing article according to claim 1, wherein the wearing article is larger than an extension force in the longitudinal direction of an elastic region by the leg elastic body.
The wearing article according to claim 2, wherein a correlation between elongation stresses of a predetermined width in the upper elastic region, the intermediate elastic region, and the lower elastic region is upper elastic region ≧ intermediate elastic region> lower elastic region. .
The stretch force of the elastic region by the leg elastic body is equal to or smaller than the stretch force of the upper portion extending from the lower portion of the rear waist elastic region to the waist opening side. The said wearing article of description.
The waist elastic body located in the lower elastic region does not overlap the absorbent core in plan view, and at least a part of the rear waist elastic body located in the intermediate elastic region is the absorbent core The wearing article according to any one of claims 2 to 4, which overlaps each other in plan view.
The wear according to any one of claims 1 to 5, wherein a fineness of the leg elastic body is smaller than a fineness of the waist elastic body, and an elongation rate of the leg elastic body is higher than an elongation rate of the waist elastic body. Goods.
The front waist region has at least a front waist elastic region that can be expanded and contracted in the lateral direction, and the front waist elastic region includes an upper elastic region positioned opposite to an upper elastic region of the rear waist region, and the rear A lower elastic region located opposite to the lower elastic region of the waist region; an intermediate elastic region opposite to the intermediate elastic region of the rear waist region; the upper elastic region in the front waist region; The wearing article according to any one of claims 1 to 6, wherein a correlation between elongation stresses having a predetermined width in the intermediate elastic region and the lower elastic region is an upper elastic region ≥ intermediate elastic region ≥ lower elastic region.
The side flap includes front and rear end portions fixed outward in the lateral direction in the front and rear waist region, a non-elastic region extending outward in the lateral direction from a side edge of the liquid absorbing structure, and the inelastic region The wearing article according to any one of claims 1 to 7, further comprising: an elastic region extending outward in the lateral direction from the side.
It further includes a crotch panel having a base sheet on which the liquid absorbing structure is disposed and a leg elasticized sheet joined to both sides of the base sheet, and the leg elasticized sheet is in a contracted state on the base sheet. The effective extension dimension at the maximum extension of the leg elasticized sheet is larger than the separation dimension in the longitudinal direction from the inner edge of the front waist region to the inner edge of the rear waist region. The wearing article of 8.
The elongation stress at 71% at the maximum extension of the upper elastic region is about 0.7 to 1.7 N / 30 mm, and the elongation stress at 71% at the maximum extension of the intermediate elastic region is about 0.4 to 1.4 N / The wearing article according to any one of claims 2 to 9, wherein an elongation stress of 30% and 71% at the maximum elongation of the lower elastic region is about 0.2 to 1.2 N / 30 mm.