JP6292652B2 - Pants-type diapers - Google Patents

Description

  The present invention relates to a disposable pants-type diaper, and more particularly, to a disposable pants-type diaper for low-age children.

  Conventionally, pants-type diapers are known. For example, in Patent Document 1, a liquid-permeable top sheet is provided with a liquid-permeable top sheet that surrounds both side edges of the absorbent body and extends and fixed to the back surface of the absorbent body to form a standing cuff. The side edges of the absorbent body are further extended from the upper side to the back surface of the absorbent body and fixed, and the start end of the fixed part forms the rising end of the standing cuff, and the standing cuff extends and contracts between the free end and the root part. The both sides of the absorbent main body are lifted by the contraction force of the member, and a plurality of thread-like waist elastic members are provided in the waist in parallel to the circumferential direction at regular intervals in the longitudinal direction. In the direction range, lower waist elastic members of 620 dtex or less are parallel to the circumferential direction at intervals shorter than the interval between the waist elastic members, discontinuously at the center of the absorber, and the front body of the crotch region is also parallel to the circumferential direction at short intervals. In the middle of the absorber, Disposable pants-type diaper of the configuration in which the connection is disclosed.

JP 2009-261981 A

  According to Patent Document 1, by providing a plurality of stretchable members in the lower waist portion in the circumferential direction, a pant-type diaper that has a leg opening edge that is difficult to flutter and that has a clean leg circumference and a good appearance is provided. The underpants type diaper of Patent Document 1 is supposed to be worn from the stage where an infant stands or from the growth stage where yes or yes can be worn, and based on the idea that the waistline needs to be tightened to prevent the diaper from falling off Designed. However, since younger infants have softer skin than infants, they tend to have elastic traces (hereinafter referred to as gather traces) on their skin, and are often lying on their backs. Has features that are not seen. Parents of young children, especially mothers who give birth for the first time, are sensitive to changes in the skin of young children and dislike gather marks. For this reason, parents of young children tend to dislike such diapers because they are concerned about the fact that the leg circumference fits too much when the leg circumference of the diaper is clean, .

  This invention makes it a subject to provide the underpants type diaper for low-age children which does not give the impression that it fits too much, maintaining the fitting property and leak-proof property which are required as a diaper for low-age children.

In order to solve the above problems, the present invention has a waistline direction and a vertical direction perpendicular to each other, a skin facing surface facing the wearer's skin, and a non-skin facing surface on the opposite side thereof, A front belt and a rear belt that extend, and a crotch panel that extends in the vertical direction and spans between the front and rear belts, and a plurality of waistline elastic members extending in the waistline direction on each of the front and rear belts are extendable. The leg elastic members are positioned so as to be stretchable along both side edges of the crotch panel that are positioned and extend in the vertical direction, and the side edges of the front and rear belts are joined to each other at the seam. A waistline opening edge is formed by the upper end portion of the belt, and a pair of leg periphery opening edges are formed by both sides of the lower end portion of the front and rear belts and the both side edge portions of the crotch panel. A pair of solid cuffs extending in parallel to both side edges of the crotch panel on the skin facing surface side of the panel, the solid cuffs extending to the both side edges of the crotch panel; The present invention relates to a pants-type diaper that is joined to at least the crotch panel at a front joint and a rear joint located at both ends in the vertical direction of the three-dimensional cuff.

The underpants type diaper according to the present invention is such that the front-rear joint portion intersects the lowest elastic member positioned at the bottom of the plurality of waistline elastic members, and from the both ends in the vertical direction of the three-dimensional cuff to the lowest The vertical cuff extends only between the elastic member and the lower end of the front and rear belt, and the solid cuff extends between the front and rear joints in parallel with the fixed edge and is joined to the crotch panel. A solid cuff elastic member attached to the free edge in an extended state and extending in parallel with the fixed edge portion between the front and rear joints, the solid cuff elastic member, Shrinkage is suppressed at the front and rear joints, and no elastic member exists between the lowermost elastic member and the lower end portion of the front and rear belts in the front and rear belt .

  In the diaper of the present application, the front and rear joints joining the both ends of the three-dimensional cuff extend in the vertical direction intersecting with the lowest elastic member located at the bottom of the plurality of waistline elastic members, respectively. When the is attached, the front joint portion extends in the vertical direction at the position where the lowermost elastic member of the waist elastic member of the front belt intersects the crotch panel and is located at the base of the wearer's leg. Further, since the three-dimensional cuff elastic member extends in parallel to the fixed edge portion between the front and rear joint portions, the front and rear joint portions are not affected by the stretchability of the three-dimensional cuff elastic member. Therefore, when the diaper is worn, the base of the wearer's leg is not compressed by the three-dimensional cuff elastic member, and the gather mark is hardly attached to the base of the wearer's leg.

  Further, as will be described later, since the lowermost part of the front and rear joints of the three-dimensional cuff is positioned below the lowermost elastic member of the waistline elastic member, in the pant diaper, the free edge of the three-dimensional cuff is more than the leg opening opening edge. Located above. Therefore, the free edge of the three-dimensional cuff is exposed in the leg opening of the pant-type diaper before being attached. When the wearer wears such a pant-type diaper, the free edge of the three-dimensional cuff is projected to the outside of the diaper together with the leg of the wearer, and is interposed between the leg of the wearer and the edge around the leg opening. As a result, the free edge of the three-dimensional cuff is located between the leg-hole elastic member extending along the leg-hole opening edge and the wearer's leg, and functions as a cushion material. Can prevent sticking. Furthermore, the free edge of the three-dimensional cuff protruding from the opening around the leg opening has a frill-like appearance and seems to fit softly to the leg, so that it does not give the impression of being too fit.

The perspective view of an example of the underpants type diaper for low-age infants concerning the present invention. The top view when an underpants type diaper is extended in the shape of a plane. The exploded perspective view of a diaper. The IV-IV line schematic cross section of FIG. FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. 2. The schematic diagram showing the wearing condition of a diaper. Explanatory drawing of each part dimension of a diaper.

Referring to FIGS. 1, 2, pant diaper 10 for low-old children of the present application, the waistline direction X and the vertical direction Y perpendicular to each other, skin-facing surface and the opposite side of the non-facing the wearer's skin A front belt 18 and a rear belt 19 having a skin facing surface and extending in the waistline direction X; and a crotch panel 13 extending in the vertical direction Y and spanning between the front and rear belts 18 and 19. A plurality of waistline elastic members 30 extending in the waistline direction X are attached to each of the front and rear belts 18 and 19 in an extended state, and legs along the side edges 13c and 13d of the crotch panel 13 extending in the vertical direction Y, respectively. A rotating elastic member 32 is attached in an extended state. The front and rear end portions 13a and 13b (see FIG. 2) of the crotch panel 13 are joined to the center portions of the front belt 18 and the rear belt 19, respectively. Further, the side edge portions 18c, 18d, 19c, 19d of the front and rear belts 18, 19 are joined together, and the upper end portion 18a of the front belt 18 and the upper end portion 19a of the rear belt 19 form a waistline opening edge 22, and the crotch panel A pair of leg periphery opening edges 23 are formed by the 13 side edges 13c and 13d and the lower end 18b and the lower end 19b of the front belt 18 and the rear belt 19.

  FIG. 2 is a plan view of the diaper 10 when the front belt 18 and the rear belt 19 in the seam portion 20 of the diaper 10 of FIG. 1 are unbonded and extended in a planar shape. Note that the vertical direction Y of the diaper 10 in FIG. 1 corresponds to the vertical direction of the paper surface in FIG. 2, and the waistline direction X corresponds to the horizontal direction of the paper surface. As shown in FIG. 2, the diaper 10 bisects the virtual center line P that bisects the size of the diaper 10 in the waistline direction X when extended in a planar shape and the vertical dimension of the diaper 10 when extended in a planar shape. About the imaginary center line Q. In other words, the pant diaper 10 of the present application has no distinction between front and rear and left and right.

  The front belt 18 and the rear belt 19 of the diaper 10 have a rectangular shape having the same shape and the same size. The front belt 18 has an upper end 18a and a lower end 18b extending in the waistline direction X, and both side edges 18c, 18d orthogonal to the upper and lower ends 18a, 18b, and the rear belt 19 is an upper end extending in the waistline direction X. It has the part 19a and the lower end part 19b, and the both-sides edge parts 19c and 19d orthogonal to the upper end part 19a and the lower end part 19b. In the pair of seam portions 20 extending in the vertical direction Y by overlapping the skin facing surfaces of the side edge portions 18c, 18d of the front belt 18 and the side edge portions 19c, 19d of the rear belt 19 that correspond to each other, for example, heat embossing When being joined by a known heat welding means such as ultrasonic welding, the upper periphery 18a, 19a of the front and rear belts 18, 19 forms a waist opening edge 22 of the diaper 10. The distance between the pair of seam portions 20 in the waist direction X increases from the upper end portions 18a and 19a toward the lower end portions 18b and 19b. A waistline elastic member 30 extending in the waistline direction X is attached to the front and rear belts 18 and 19 in an extended state, and leg leg elastic members 32 extending in the vertical direction Y are extended to both side edges 13c and 13d of the crotch panel 13. It is attached with.

  As shown in FIG. 3, the front and rear belts 18 and 19 each have a plurality of waistline elastic members extending in the waistline direction X while one front sheet member 24 and one rear sheet member 25 are folded back in half. 30 is joined by a hot melt adhesive in an expanded state. That is, in this embodiment, the sheet surface located on the skin-facing surface side when one front sheet member 24 or the rear sheet member 25 is folded in half corresponds to the skin-side sheet 26 in the claims. The sheet surface located on the skin facing surface side corresponds to the outer sheet 27. It is not necessary to fold back one front sheet member 24 and one rear sheet member 25 exactly in half. For example, in the vertical direction Y, the dimension of the skin side sheet may be larger than the dimension of the outer sheet. Thus, when the dimension of the up-down direction Y of a skin side sheet | seat is larger, the skin contact with respect to the wearer of the lower end parts 18b and 19b of the front and back belts 18 and 19 can be made soft. Instead of folding one sheet and forming the skin side sheet 26 and the outer sheet 27 of the front and rear belts 18 and 19 as in the present embodiment, the skin side sheet 26 and the outer sheet 27 are separated by separate sheet members. It can also be formed.

  In the front and rear belts 18 and 19, the skin side sheet 26 and the outer sheet 27 are joined to each other only by the hot melt adhesive applied to the plurality of waistline elastic members 30. As a result, a large number of small bulges are formed on the skin side sheet 26 and the outer sheet 27 between the adjacent waistline elastic members 30 due to the shrinkage of the waistline elastic members 30, and the front and rear belts 18, 19 are made of a soft material. And when the diaper 10 is put on the wearer, it seems to fit softly, so that it does not give the impression of being too fit.

  In the diaper 10 of the present application, in at least one of the front and rear belts 18 and 19, the lowermost elastic member 30 b positioned at the bottom of the plurality of waistline elastic members 30, the lower ends 18 f and 19 f of the front and rear belts 18 and 19, Are separated. As a result, the lower ends 18f and 19f of the front and rear belts 18 and 19 are in a frilled shape, so that they appear to be fluttering and fit softly from the body of the low-aged child. When wearing a child, do not feel anxiety, such as whether the younger children feel cramped. In this case, the ratio of the distance between the lowermost elastic member 30b and the lower ends 18f and 19f of the front and rear belts 18 and 19 to the distance between the upper ends 18e and 19e and the lower ends 18f and 19f of the front and rear belts 18 and 19 is 12 to 12. It is preferable that it is 20%, preferably 12 to 15%.

  Further, in at least one of the front and rear belts 18 and 19, the uppermost elastic member 30a of the plurality of waistline elastic members 30 and the upper ends 18e and 19e of the front and rear belts 18 and 19 are preferably within 15 mm. Are preferably separated within a range of 10 mm or less. As a result, the uppermost elastic member 30a and the upper ends 18e and 19e of the front and rear belts 18 and 19 have a rounded and bulging shape, so that it does not give the impression of being too fit. Furthermore, the skin side sheet 26 and the outer sheet 27 constituting the front and rear belts 18 and 19 extend from the seam portion 20 that joins the front and rear belts 18 and 19 to the outside of the diaper 10 within a range of 15 mm or less, preferably 10 mm or less, It is preferably in the form of a frill. This also makes the front and rear belts 18 and 19 appear to be made of a soft material, and when the diaper 10 is fitted to the wearer, it appears to fit softly, so the impression that it fits too much Never give.

The front sheet member 24 and the rear sheet member 25 are preferably formed using a fiber nonwoven fabric or a plastic sheet made of a thermoplastic resin having air permeability. As fiber nonwoven fabric or plastic sheet made of thermoplastic resin, for example, SMS (spunbond / meltblown / spunbond) fiber nonwoven fabric, spunbond nonwoven fabric, air-through nonwoven fabric, breathable plastic having a mass per unit area of about 10 to 30 g / m ² One type or two or more types can be selected and used from the group consisting of sheets.

  The plurality of waistline elastic members 30 extending in the waistline direction X in the front sheet member 24 and the rear sheet member 25 are composed of a plurality of strand-like or string-like elastic yarns, and are folded using a hot melt adhesive. The bonded sheets are joined in an extended state. For example, elastic yarns such as rubber strings having a thickness of 310 to 620 dtex, preferably 400 to 600 dtex are used as the elastic yarns having a plurality of strips, and an extension ratio of 2.0 to 3.5 times, preferably an extension ratio of 2. It is possible to join between the folded back sheet member 24 and rear sheet member 25 at 0 to 2.5 times.

  2 and 3, the crotch panel 13 has a rectangular shape, and includes an absorbent body 11, an inner surface sheet 44 to which the absorbent body 11 is joined on the skin facing surface side, and a non-skin facing surface side of the inner surface sheet 44. And an outer sheet 45 to be joined. The crotch panel 13 includes front and rear end portions 13a and 13b extending in the waistline direction X and both side edge portions 13c and 13d extending in the vertical direction Y. The non-skin facing surfaces of the front and rear end portions 13a and 13b of the crotch panel 13 are Each of the front belt 18 and the rear belt 19 is joined to the center of the skin facing surface by a hot melt adhesive 51. In this embodiment, the hot melt adhesive 51 is applied between the front belt 18 and the rear belt 19 and the front and rear end portions 13a and 13b of the crotch panel 13 in a stripe shape in a direction parallel to the vertical direction Y. Yes. Further, leg elastic members 32 extending in the vertical direction Y are attached to both side edges 13c and 13d of the crotch panel 13 in an extended state. Further, a pair of three-dimensional cuffs 40 extending in parallel with the side edges 13c and 13d are provided on the skin facing surface side of the crotch panel 13. In many cases, the low-age children are in a supine posture, but by applying the hot melt adhesive 51 in a stripe shape between the front and rear belts 18 and 19 and the crotch panel 13 as described above, A space extending in the vertical direction Y between the adjacent hot melt adhesives 51 functions as a vent hole, which is preferable because it prevents the wearer's back from becoming stuffy.

  The inner surface sheet 44 has an area and shape that can completely cover the non-skin facing surface of the absorbent body 11, and is formed from a liquid-impermeable plastic film. Since the outer surface sheet 45 constitutes a part of the inner surface of the diaper 10, it is preferable to form the outer sheet 45 with a fiber nonwoven fabric that has air permeability and good touch. The absorbent body 11 has an hourglass shape in which a central portion in the vertical direction Y is recessed inward. For example, a known body fluid absorbent material such as fluff pulp and superabsorbent polymer particles (SAP) is used as tissue paper. Although it can be formed by wrapping and covering with a nonwoven fabric having liquid permeability and flexibility, it is not limited to this. The absorbent body 11 is joined to the central portion of the skin facing surface of the inner surface sheet 44 by a hot melt adhesive. Further, the upper and lower end portions 11a and 11b of the absorbent body 11 overlap with portions where the waistline elastic members 30 of the front and rear belts 18 and 19 are present, respectively.

  The outer sheet 45 constituting the crotch panel 13 has a dimension in the waistline direction X that is larger than that of the inner sheet 44, and is extended to both outer sides of the inner sheet 44 in the waistline direction X when overlapped and joined to the inner sheet 44. The extending portion 46 is provided. The absorber 11 is located between the pair of extending portions 46. In each extending portion 46, a plurality of leg-hole elastic members 32 extending in the vertical direction Y are attached to the region extending along the side edge of the inner surface sheet 44 in a stretched state by a hot melt adhesive. The leg elastic member 32 includes an inner elastic member 32 a closest to the absorber 11 in the waist direction X and an outer elastic member 32 b farthest from the absorber 11.

  Further, at both side edges of the outer sheet 45, a sleeve 43 is formed by folding the skin facing surface inward, and a plurality of three-dimensional solid cuff elastic members 42 extending in the vertical direction Y extend in the sleeve 43. It is attached in a state by a hot melt adhesive. The sleeve 43 constitutes a part of the free edge portion 40 d of the three-dimensional cuff 40 that can stand up with respect to the crotch panel 13. For the leg elastic member 32 and the three-dimensional cuff elastic member 42, the same elastic yarn as that of the waist elastic member 30 can be used. The expansion ratio of the leg-hole elastic member 32 and the three-dimensional cuff elastic member 42 can be 2.0 to 3.5 times, preferably 2.0 to 2.5 times.

  It is preferable that the expansion ratio of the elastic yarn constituting the leg elastic member 32 is equal to or higher than the expansion ratio of the elastic yarn constituting the waist elastic member 30. Specifically, it is not necessary to consider diaper gaps because younger children do not walk around. Therefore, it is possible to reduce the stretch magnification of the waistline elastic member 30 to the minimum necessary for preventing leakage, and to prevent gather marks from forming on the abdomen of the low-aged infant. However, in this case, there is a possibility that the diaper 10 may shift due to the movement of the low-aged child who is in a sleeping position. If the expansion ratio of the leg elastic member 32 is made higher than the expansion ratio of the waist elastic member 30, the body of the low-age child can be prevented by contraction of the leg elastic member 32 while preventing gather marks on the abdomen of the low-age child. The position of the diaper 10 relative to can be determined.

  As shown in FIGS. 2 to 5, the outer sheet 45 is folded back along the outer elastic member 32 b with the skin-facing surface inside, and between the folded outer sheet 45, the leg periphery including the inner elastic member 32 a is provided. The elastic member 32 and the side edge of the inner surface sheet 44 are sandwiched. In FIG. 3, the folding line of the outer sheet 45 is indicated by a one-dot chain line. 4 and 5, the hot melt adhesive is not shown. The portions from the outer elastic member 32b to the inner elastic member 32a between the opposed surfaces of the folded outer sheet 45 are bonded together by a hot melt adhesive. When the diaper 10 is worn, the outer sheet 45 is folded and the outer elastic member 32b is sandwiched between the side edges 13c and 13d of the crotch panel 13 to form part of the leg opening 23. Fits the wearer's leg. The outer elastic member 32b is preferably separated from the ends of the side edge portions 13c, 13d of the crotch panel 13 within 15 mm, preferably within 10 mm. Thereby, both side edge parts 13c and 13d of the crotch panel 13 become a frill shape, and it seems that it floats and fits softly from the body of the low-age child, so it does not give the impression that it fits too much.

  On the other hand, the three-dimensional cuff 40 is formed by a region from the position where the inner elastic member 32 a exists to the sleeve 43 in the folded outer surface sheet 45. Specifically, the three-dimensional cuff 40 includes a fixed edge portion 40c that extends in parallel with both side edge portions 13c and 13d of the crotch panel 13, and a front joint portion 48a and a rear joint portion that are positioned at both ends 40a and 40b in the vertical direction Y of the three-dimensional cuff 40. The portion 48b is joined to the crotch panel 13 (see FIGS. 2 and 4). The front and rear joint portions 48a and 48b extend in the vertical direction, respectively, and intersect with the lowest elastic member 30b located at the bottom of the plurality of waist elastic members 30 attached to the front and rear belts 18 and 19. Is provided. The three-dimensional cuff 40 extends between the front and rear joint portions 48a and 48b in parallel with the fixed edge portion 40c, and is attached to the free edge portion 40d in a stretched state and a free edge portion 40d that is not joined to the crotch panel 13. And a three-dimensional cuff elastic member 42 extending in parallel with the fixed edge portion 40c between the front and rear joint portions 48a and 48b.

  In the present embodiment, the fixed edge portion 40c of the three-dimensional cuff 40 substantially overlaps with the inner elastic member 32a and extends in parallel with both side edge portions 13c and 13d of the crotch panel 13. With this fixed edge 40c as the base end, the free edge 40d of the three-dimensional cuff 40 stands up with respect to the crotch panel 13 (see FIG. 5). In addition, the front and rear joining portions 48 a and 48 b where the both ends 40 a and 40 b in the vertical direction Y of the three-dimensional cuff 40 are joined to the crotch panel 13 are downward from the lowest elastic member 30 b located at the bottom of the waist elastic member 30. It extends (see FIG. 2). Accordingly, the lowermost portions of the front and rear joint portions 48a and 48b are positioned below the lowermost elastic member 30b (see FIG. 6).

  As shown in FIG. 4, in the present embodiment, both end portions 40 a and 40 b of the three-dimensional cuff 40 are in a state where the sleeve 43 is folded back toward the outside of the diaper 10, and the crotch panel 13 is formed at the front and rear joint portions 48 a and 48 b. It is joined to. At this time, the three-dimensional cuff elastic member 42 attached to the inside of the sleeve 43 is also joined to the crotch panel 13 at the front and rear joining portions 48a and 48b.

  The joining between the both end portions 40a and 40b of the three-dimensional cuff 40 and the crotch panel 13 at the front and rear joining portions 48a and 48b can be performed using a heat seal or a hot melt adhesive. In the present embodiment, both end portions 40a and 40b of the three-dimensional cuff 40 are joined to the skin facing surface of the crotch panel 13 by heat sealing. Therefore, the three-dimensional cuff elastic member 42 attached to the inner side of the sleeve 43 located at the front and rear joint portions 48a and 48b is also joined to the crotch panel 13 by heat sealing. For this reason, even if the three-dimensional cuff elastic member 42 is located at the front and rear joint portions 48a and 48b, the stretchability of the three-dimensional cuff elastic member 42 is lost. Bonding by heat sealing is preferable because the dimensions in the vertical direction Y of the front and rear bonded portions 48a and 48b can be easily controlled as compared with the hot melt adhesive.

  On the other hand, the three-dimensional cuff elastic member 42 can be expanded and contracted on the sleeve 43 included in the free edge portion 40d that extends between the front and rear joint portions 48a and 48b in parallel with the fixed edge portion 40c and is not joined to the crotch panel 13. It is attached. Therefore, when the diaper 10 is worn, the free edge portion 40d stands up with respect to the crotch panel 13 due to the contraction of the three-dimensional cuff elastic member 42.

  As described above, the three-dimensional cuff elastic member 42 located at the front and rear joint portions 48a and 48b is expanded and contracted by joining the vertical ends Y both ends 40a and 40b of the three-dimensional cuff 40 to the crotch panel 13 at the front and rear joint portions 48a and 48b. Is suppressed. Here, since the front joint portion 48a extends in the vertical direction Y at the position where the lowermost elastic member 30b of the plurality of waistline elastic members 30 and the crotch panel 13 intersect, when the diaper 10 is mounted Located at the base of the wearer's leg. In the diaper 10 of the present application, since the expansion and contraction of the three-dimensional cuff elastic member 42 at the front joint portion 48a is suppressed as described above, when the diaper 10 is attached, the base portion of the wearer's leg is the three-dimensional cuff elastic member. No pressure is applied by 42. For this reason, it becomes difficult to make a gather mark on the base of the wearer's leg. In addition, since the underpants type diaper 10 of this embodiment has no distinction between front and back and left and right, even if a guardian unaccustomed to handling diapers accidentally puts the front and back of the pant type diaper 10 on a younger child, the wearer It is possible to prevent gather marks from forming at the base of the legs.

  Moreover, it is preferable that the expansion ratio of the three-dimensional cuff elastic member 42 is substantially the same as the expansion ratio of the expansion ratio of the leg-hole elastic member 32. Thereby, since the leg elastic member 32 and the three-dimensional cuff elastic member 42 contact with the leg of a low-age child with the same contraction force, the effect of preventing leakage from the leg circumference can be enhanced. Further, by gathering the contraction force necessary to ensure the fit to the leg of the young child to the leg elastic member 32 and the three-dimensional cuff elastic member 42, one of the gather marks is deteriorated. Can be prevented.

  Further, since the lowermost portions of the front and rear joining portions 48a and 48b of the three-dimensional cuff 40 are located below the lowermost elastic member 30b of the waistline elastic member 30, the free edge of the three-dimensional cuff 40 is provided in the pant-type diaper 10. The portion 40d is located above the leg-hole opening edge 23. Therefore, as shown in FIG. 1, the free edge 40d of the three-dimensional cuff 40 is exposed in the leg-hole opening of the pant-type diaper 10 before being attached. When such a pants-type diaper 10 is attached to a low-age child, the free edge portion 40d of the three-dimensional cuff 40 protrudes out of the diaper 10 together with the leg of the low-age child, as schematically shown in FIG. It intervenes between the leg of a low-aged child and the leg periphery opening edge 23. As a result, the free edge portion 40d of the three-dimensional cuff 40 is located between the leg elastic member 32 extending along the leg opening edge 23 and the leg of the low-age child and functions as a cushioning material. It is possible to prevent gather marks from appearing on the legs. Furthermore, since the free edge portion 40d of the three-dimensional cuff 40 protruding from the leg opening edge 23 has a frill-like appearance and seems to be softly fitted to the leg, there is no impression that it is too fit.

  Further, the folded portion of the sleeve 43 of the three-dimensional cuff 40 formed by folding the outer surface sheet 45 becomes the distal edge 40e of the free edge portion 40d that is spaced from and parallel to the fixed edge portion 40c, and the pants-type diaper 10 is made to be a low-age child. When the diaper 10 is put on, the diaper 10 is pushed out. In the sleeve 43, it is preferable that the three-dimensional cuff elastic member 42 attached to the free edge portion 40d and the distal edge 40e are separated from each other. Thereby, since the distal edge 40e of the sleeve 43 becomes a frill shape, it is possible to further enhance the impression that the sleeve 43 is softly fitted to the leg of the young child.

  7 (a) to 7 (c), the underpants-type diaper 10 of the present application is configured so that all elastic members (the waistline elastic member 30 and the leg-hole elastic in the above-described embodiment) under conditions where no tension is applied to the diaper 10. When the member 32 and the three-dimensional cuff elastic member 42) are in a freely contracted state, a virtual center extending in the vertical direction by dividing the waist dimension X dimension of the diaper 10 into two equal parts in a plan view viewed from the front belt 18 side. The lower end of the front belt 18 in a plan view when the diaper 10 is viewed from the front belt 18 side, and the dimension L1 (see FIG. 7A) measured along the seam portion 20 in the vertical direction. The dimension L2 of either one of the side edges 13c, 13d of the crotch panel 13 exposed below the portion 18b (see FIG. 7A) and the plan view when the diaper 10 is viewed from the rear belt 19 side. Have The length L3 of the side edge 13c on the side of the rear belt 19 or the length L3 of the side edge 13d exposed below the lower end 19b of the rear belt 19 continuously from one of the side edges 13c, 13d on the front belt 18 side. (See FIG. 7B) has a relationship of (L2 + L3) /L1≧1.0, preferably (L2 + L3) /L1≧1.5. L2 + L3 is a side of the crotch panel 13 that is exposed below the lower end portions 18a and 18b of the front and rear belts 18 and 19 and constitutes a part of one of the pair of leg opening edges 23 in a side view of the diaper 10. This corresponds to the circumferential length of the edge 13c or the side edge 13d (see FIG. 7C).

  When L1, L2 and L3 are in the above relationship, when the diaper 10 is attached to the wearer, the area of the crotch panel 13 extending to the crotch of the wearer is the front and rear belt 18 tightening the waistline, It looks larger than 19 areas. Since the crotch panel 13 looks larger than the front and rear belts 18 and 19 as described above, it is as if the force of tightening the waist of the diaper is weak and is shifted to the inseam of the wearer, so-called loose rubber pants are worn. Because it reminds me of being, it does not give the impression of being too fit. It is preferable that the front belt 18 and the rear belt 19 of the diaper 10 have the same shape and the same size.

A specific method for measuring L1, L2, and L3 is as follows.
<Measurement of L1 and L2>
The rear belt 19 of the diaper 10 is placed on a table having a horizontal plane so that the rear belt 19 contacts the horizontal plane. Next, a photograph of the diaper 10 viewed from the front belt 18 side is taken from above the diaper 10 so that the scale can be understood. From the outline of the diaper 10 in the obtained photograph, the length of a line segment that linearly connects the upper end and the lower end of either one of the seam portions 20 of the front belt 18 is measured and is defined as L1. Next, from the outline of the diaper 10 in this photograph, the lowermost end 35 of the leg opening edge 23 is defined, and one of the side edges 13c and 13d of the crotch panel 13, for example, the side edge 13d of the crotch panel 13 is formed. The intersection 36 of the leg periphery opening edge 23 and the lower end part 18b of the front belt 18 is defined. The length of the line segment that linearly connects the lowermost end 35 and the intersection point 36 is measured, and is defined as the length L2 of the side edge 13d on the front belt 18 side of the crotch panel 13.
<Measurement of L3>
Next, the diaper 10 is inverted and placed so that the front belt 18 contacts the horizontal surface of the table. A photograph of the diaper 10 seen from the rear belt 19 side is taken from above the diaper 10 so that the scale can be understood. From the outline of the diaper 10 in this photograph, the lowermost end 35 of the leg periphery opening edge 23 (that is, the leg periphery opening edge 23 formed by the side edge portion 13d), which is the same as the leg periphery opening edge 23 in which L2 is measured, An intersection point 37 between the rotation opening edge 23 and the lower end portion 19b of the rear belt 19 is determined, a length of a line segment linearly connecting the lowermost end 35 and the intersection point 37 is measured, and the rear belt 19 side of the crotch panel 13 is measured. The length is L3 of the edge portion 13d.
<Calculation>
The lengths of L1, L2, and L3 are obtained in mm, and the numbers after the decimal point are rounded off. Next, the value of (L2 + L3) / L1 is calculated and rounded off and displayed in two significant digits.

  The dimension L1 measured along the seam part 20 of the underpants type diaper 10 of this application is set so that the upper end part 18a of the front belt 18 may not reach a wearer's navel. Although the specific numerical value of the dimension L1 changes with wearer's age, it is about 60-70 mm, for example in the case of a newborn (within one month after being born). The umbilicus of young children is soft and is susceptible to various diseases. For this reason, it is preferable not to give irritation | stimulation to the navel of a young-aged child, and in order to discover a disease easily, it is preferable not to cover the navel with the front belt 18 of the diaper 10. The pants-type diaper 10 of the present application prevents the upper end portions 18a and 19a of the front and rear belts 18 and 19 from reaching the wearer's navel and at the same time does not give the impression of being too fit. In addition, since the abdomen of the low-aged child is swollen, if the upper end portions 18a and 19a of the front and rear belts 18 and 19 do not reach the wearer's navel, the diaper 10 is moved by the movement of the low-aged child who is in a sleeping position. There is a risk of shifting. However, as described above, if the expansion ratio of the leg elastic member 32 is set higher than the expansion ratio of the waist elastic member 30, the leg elastic member 32 contracts without causing irritation to the umbilicus of the low-age infant. The position of the diaper 10 with respect to the body of a young child can be determined.

  In the above description, the example of the pants-type diaper 10 for a low-aged child comprising the rectangular front and rear belts 18 and 19 and the crotch panel 13 has been described. However, the present invention is not limited to this example. The part 18b, 19b may have a shape that protrudes downward in a trapezoidal shape or an arc shape. Further, although an example in which the front belt 18 and the rear belt 19 have the same size in the vertical direction Y has been described, for example, the rear belt 19 may be larger in the vertical direction Y than the front belt 18. Further, although the three-dimensional cuff 40 has been described based on the example in which the outer sheet 45 constituting the crotch panel 13 is folded back, the three-dimensional cuff 40 is formed of a sheet member different from the outer sheet 45 to form the crotch panel 13. It can also be joined. In this case, the front and rear joint portions 48 a and 48 b of the three-dimensional cuff 40 may extend from the crotch panel 13 to the front and rear belts 18 and 19. In other words, as long as the lowermost portions of the front and rear joints 48a and 48b of the three-dimensional cuff 40 are positioned below the lowermost elastic member 30b of the plurality of waistline elastic members 30, the three-dimensional cuff 40 is vertically moved. Both end portions 40a and 40b may be joined to the crotch panel 13 and the front and rear belts 18 and 19, respectively. The lowermost portions of the front and rear joint portions 48a and 48b may be located above or below the lower ends 18f and 19f of the front and rear belts 18 and 19, respectively.

  Unless otherwise specified, each of the constituent members constituting the diaper 10 uses, without limitation, various known materials that are usually used in this type of field, in addition to the materials described in this specification. be able to. Further, “joining with a hot-melt adhesive” means that the hot-melt adhesive is applied and joined in a known pattern such as a spiral shape, a dot shape, or a stripe shape unless otherwise specified.

The disclosure relating to the first aspect of the present invention described above can be summarized in at least the following matters.
Front and rear belts extending in the waistline direction, having a waistline direction and a vertical direction perpendicular to each other, a skin facing surface facing the wearer's skin and a non-skin facing surface on the opposite side thereof, A crotch panel spanned between the front and rear belts, and a plurality of waist elastic members extending in the waist direction are attached to each of the front and rear belts in an extended state, along each of both side edges of the crotch panel extending in the vertical direction The leg elastic members are attached in an extended state, the side edges of the front and rear belts are joined to each other at the seam, and a waist opening edge is formed by the upper ends of the front and rear belts. A pair of leg opening openings are formed by both sides and both side edges of the crotch panel, and a pair of three-dimensional caps extending in parallel to both side edges of the crotch panel on the skin facing surface side of the crotch panel A pants-type diaper in which a three-dimensional cuff is joined to a crotch panel at a fixed edge extending in parallel to both side edges of the crotch panel, and a front joint and a rear joint located at both ends in the vertical direction of the three-dimensional cuff Each of the front and rear joints intersects the lowermost elastic member located at the bottom of the plurality of waistline elastic members, and the lowermost elastic member and the lower end portions of the front and rear belts from both ends in the vertical direction of the three-dimensional cuff. The three-dimensional cuff extends in parallel with the fixed edge between the front and rear joints, and is attached to the free edge in an extended state. A three-dimensional cuff elastic member extending in parallel with the fixed edge portion between the front and rear joints, and the three-dimensional cuff elastic member is prevented from contracting at the front and rear joints, and in the front and rear belt, Before and after The elastic member does not exist between the lower end portion of the belt.

The present invention described above can include at least the following embodiments.
(1) The three-dimensional cuff is welded to the crotch panel at the front and rear joints, and the three-dimensional cuff elastic member does not have elasticity at the front and rear joints.
( 2 ) Each of the front belt and the rear belt includes a skin side sheet positioned on the skin facing surface side and an outer sheet positioned on the non-skin facing surface side, and a plurality of waists between the skin side sheet and the outer sheet The elastic member is located, and the skin side sheet and the outer sheet are joined to each other only by the hot melt adhesive applied to the waistline elastic member.
( 3 ) The waistline direction of the diaper in a plan view seen from the front belt side when all elastic members attached to the front and rear belts and the crotch panel are freely contracted under the condition that no tension is applied to the diaper. It is symmetrical with respect to a virtual center line extending in the vertical direction by dividing the dimension into two equal parts, and is below the lower end of the front belt in the plan view when the diaper is viewed from the front belt side and the length L1 of the seam portion extending in the vertical direction The length L2 of either one of both side edges on the front belt side of the crotch panel exposed to the side, and the side edge on the front belt side of the crotch panel having the length L2 in a plan view when the diaper is viewed from the rear belt side The length L3 of the side edge portion on the rear belt side exposed continuously from the lower end portion of the rear belt is in the relationship of (L2 + L3) /L1≧1.0.
( 4 ) In at least one of the front and rear belts, the lowermost elastic member positioned at the bottom of the plurality of waistline elastic members is separated from the lower ends of the front and rear belts.
( 5 ) The ratio of the separation dimension between the lowermost elastic member and the lower ends of the front and rear belts to the separation dimension between the upper and lower ends of the front and rear belts is 12 to 20%.
( 6 ) In at least one of the front and rear belts, the uppermost elastic member positioned at the top of the plurality of waistline elastic members and the upper ends of the front and rear belts are separated from each other.
( 7 ) In the crotch panel, the ends of the side edge portions and the leg-hole elastic members are separated from each other.
( 8 ) In the waist direction, the distal edge of the free edge that is spaced parallel to the fixed edge of the solid cuff and the solid cuff elastic member attached to the free edge are spaced apart.
( 9 ) The side edge portions of the front and rear belts are joined to each other at a seam portion extending in the vertical direction with the skin facing surfaces of the front and rear belts facing each other, and the skin side sheet and the outer sheet constituting the front and rear belts from the seam portion are diapers. It extends to the outside.
( 10 ) The waistline elastic member and the legline elastic member are made of elastic yarns of the same material and shape, and the expansion rate of the elastic yarn constituting the legline elastic member is greater than or equal to the extension rate of the elastic yarn constituting the waistline elastic member. is there.
( 11 ) The front and rear belts have the same vertical dimension.

DESCRIPTION OF SYMBOLS 10 Pants-type diaper 11 Absorber 13 Crotch panel 13c, 13d Crotch panel side edge 18 Front belt 18a Front belt upper end 18b Front belt lower end 18c, 18d Front belt side edge 18e Front belt upper end 18f Front Lower end 19 of the belt Rear belt 19a Upper end portion 19b of the rear belt Lower end portions 19c, 19d of the rear belt Side edge portion 19e of the rear belt Upper end 19f of the rear belt Lower end 20 of the rear belt 22 Seam portion opening edge 23 Leg opening edge 26 Skin side sheet 27 Outer sheet 30 Girth elastic member 30a Uppermost elastic member 30b Lowermost elastic member 32 Leg elastic member 40 Three-dimensional cuff 40a, 40b Up-and-down direction both ends 40c of three-dimensional cuff Fixed edge 40d Free edge 40e Distal edge 42 Three-dimensional cuff elastic member 48a Front joint portion 48b Rear joint portion 51 Hot melt adhesive X The length of the side edge portions in the vertical direction L1 after the belt side length L3 crotch panel side edges of the front belt side length L2 crotch panel seams

Claims (12)

Front and rear belts having a waistline direction and a vertical direction perpendicular to each other, a skin facing surface facing the wearer's skin and a non-skin facing surface opposite thereto, and extending in the waistline direction, A crotch panel extending and spanning between the front and rear belts,
A plurality of waistline elastic members extending in the waistline direction are located on each of the front and rear belts such that the waistline elastic members can be expanded and contracted, and the legline elastic members can be expanded and contracted along both side edges of the crotch panel extending in the vertical direction. The side edge portions of the front and rear belts are joined to each other at the seam portion to form a waistline opening edge by the upper end portions of the front and rear belts, and both sides of the lower end portion of the front and rear belts and the both sides of the crotch panel A pair of leg opening edges are formed by the edges,
On the skin facing surface side of the crotch panel, a pair of three-dimensional cuffs extending in parallel to the both side edges of the crotch panel,
Pants where the three-dimensional cuff is joined to the crotch panel at a fixed edge extending in parallel with the both side edges of the crotch panel, and a front joint and a rear joint located at both ends in the vertical direction of the three-dimensional cuff A type diaper,
Each of the front and rear joints intersects the lowermost elastic member positioned at the bottom of the plurality of waistline elastic members, and the lower elastic member and the front and rear belts from the both ends in the vertical direction of the three-dimensional cuff. It extends in the vertical direction only between the lower end part,
The three-dimensional cuff extends between the front and rear joints in parallel with the fixed edge and is not joined to the crotch panel; and the front and rear joints are attached to the free edge in an extended state. A three-dimensional cuff elastic member extending in parallel with the fixed edge between,
The three-dimensional cuff elastic member is prevented from contracting at the front and rear joints ,
In the front and rear belts, a pants-type diaper wherein no elastic member is present between the lowermost elastic member and the lower end portion of the front and rear belt .   The underpants type diaper according to claim 1, wherein the three-dimensional cuff is welded to the crotch panel at the front and rear joints, and the three-dimensional cuff elastic member does not have elasticity at the front and rear joints. Each of the front belt and the rear belt includes a skin side sheet positioned on the skin facing surface side and an outer sheet positioned on the non-skin facing surface side, and a plurality of the belts are provided between the skin side sheet and the outer sheet. The waist elastic member of the strip is located,
The pants-type diaper according to claim 1 or 2, wherein the skin-side sheet and the outer sheet are joined to each other only by a hot-melt adhesive applied to the waistline elastic member. When all elastic members attached to the front and rear belts and the crotch panel are freely contracted under a condition where no tension is applied to the diaper,
In a plan view seen from the front belt side, the waistline direction dimension of the diaper is bisected and symmetrical with respect to a virtual center line extending in the vertical direction,
A length L1 of the seam portion extending in the vertical direction;
In a plan view when the diaper is viewed from the front belt side, the length L2 of either one of both side edge portions on the front belt side of the crotch panel exposed below the lower end portion of the front belt;
In a plan view of the diaper viewed from the rear belt side, the crotch panel having the length L2 is continuously exposed from the side edge portion on the front belt side of the crotch panel and exposed below the lower end portion of the rear belt. The underpants type diaper according to any one of claims 1 to 3, wherein the length L3 of the side edge on the rear belt side has a relationship of (L2 + L3) /L1≥1.0.   The lowermost elastic member positioned at the bottom of the plurality of waist elastic members and the lower ends of the front and rear belts are spaced apart from each other in at least one of the front and rear belts. The underpants type diaper described in any one.   The underpants type diaper according to claim 5, wherein a ratio of a separation dimension between the lowermost elastic member and the lower end of the front and rear belts to a separation dimension between the upper end and the lower end of the front and rear belts is 12 to 20%.   The uppermost elastic member located on the uppermost of the plurality of waistline elastic members and the upper ends of the front and rear belts are spaced apart from each other in at least one of the front and rear belts. Pants-type diapers described in 1.   The underpants type diaper according to any one of claims 1 to 7, wherein, in the crotch panel, each end of the both side edges extending in the up-down direction and the leg-hole elastic member are separated from each other.   The distal edge of the free edge that is spaced apart and parallel to the fixed edge of the solid cuff and the solid cuff elastic member attached to the free edge are spaced apart from each other in the waist direction. The underpants type diaper in any one of -8.   The side edges of the front and rear belts are joined to each other at the seam portion extending in the up and down direction with the skin facing surfaces of the front and rear belts facing each other, and the skin side constituting the front and rear belts from the seam portion The pants-type diaper according to claim 3, wherein the sheet and the outer sheet extend outside the diaper.   The waistline elastic member and the legline elastic member are made of elastic yarns of the same material and shape, and the expansion ratio of the elastic yarn constituting the legline elastic member is the extension of the elastic yarn constituting the waistline elastic member. It is more than magnification. The underpants type diaper according to any one of claims 1 to 10.   The underpants type diaper according to any one of claims 1 to 11, wherein the front belt and the rear belt have the same vertical dimension.

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