JP2016193058A - Disposable clothing article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable clothing article which prevents lower end parts of bonding lines joining waist belts and a diaper body while worn or put on from being peeled off.SOLUTION: A pair of waist belts 17 are bonded to a diaper body 16 via bonding lines 18 that are inwardly inclined from outside in a horizontal direction X from leg openings 15 side to a waist opening 14 side in front and rear waist areas 11, 12. The bonding lines 18 have: upper end parts 61 positioned on the side of the waist opening 14; and lower end parts 62 positioned on the side of leg openings 15. Peel strength in a vertical direction Y in the lower end parts 62 is larger than peel strength in the vertical direction Y in the upper end parts 61.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a disposable wearing article.

  Conventionally, disposable wearing articles provided with a waist belt are known. For example, Patent Document 1 discloses a disposable wearing article (disposable diaper) including a diaper body having an absorber and a pair of waist belts for connecting the front and rear waist regions. The pair of waist belts and the diaper main body are joined to each other via a pair of joining lines extending obliquely with respect to the longitudinal center line of the diaper in the front and rear waist region.

JP-A-9-290003

  According to the disposable wearing article disclosed in Patent Document 1, in the manufacturing process, the waist belt can be transported in the transport direction of the diaper body, and all the constituent materials of the diaper can be transported and stacked in the same direction. High-speed continuous production is possible and manufacturing efficiency is excellent. Moreover, required peeling strength is exhibited by arrange | positioning the several junction part to a joining line, and isolation | separation with the waist belt and diaper main body during wear is prevented.

  However, the shape, distribution density, etc. of the joints forming the joint line are uniform, and the peel strength is generally the same. Since such a wearing article has a unique aspect in which the joining line extends obliquely with respect to the longitudinal center line, when the diaper is worn, the lower end of the joining line has a force to pull it up. It works stronger than other parts. Therefore, it is necessary to set the peel strength of the joining line high, but if the area of the joint is widened to increase the peel strength of the entire joining line, the rigidity of the joining line becomes excessively high, and the wearer May give a sense of incongruity.

  Then, the subject of this invention is improvement of the conventional disposable wearing article, Comprising: The disposable lowering part of the joining line | wire which connects a waist belt and a diaper main body during wearing and a wearing operation does not have a possibility of peeling. On offer.

  The present invention has a longitudinal direction and a lateral direction, a front and rear waist region, a crotch region located between the front and rear waist regions, a diaper body having an absorber, and a pair of waists for connecting the front and rear waist regions The present invention relates to a disposable wearing article including a belt, a waist opening, and a pair of leg openings.

  In the disposable wearing article according to the present invention, the pair of waist belts is connected to the front and rear waist regions via a joining line that inclines from the leg opening side toward the waist opening side toward the inside from the lateral outer side. It is joined to the diaper body, and the joining line has an upper end portion located on the waist opening side and a lower end portion located on the leg opening side, and the longitudinal peel strength at the lower end portion is The upper peel strength is higher than the peel strength in the longitudinal direction.

  According to the disposable wearing article according to the present invention, the longitudinal peel strength at the lower end is higher than the longitudinal peel strength at the upper end in the joining line. Even if a force pulling in the direction acts strongly, it is possible to suppress the occurrence of peeling starting from the lower end.

The drawings illustrate certain embodiments of the invention according to the present disclosure and include selective and preferred embodiments as well as essential configurations of the invention.
The perspective view of the disposable diaper shown as an example of the disposable wearing article in 1st Embodiment of this invention. The top view in the state which extended the diaper to the vertical direction and the horizontal direction, and contact | abutted the inner surface of a waist belt and the inner surface of a diaper main body. The expansion | deployment top view in the state which uncouple | bonded the joining line in the front-and-rear waist area of a diaper, and extended the diaper main body and the waist belt to the vertical direction and the horizontal direction. FIG. 4 is a schematic sectional view taken along line IV-IV in FIG. 2. FIG. 2 is a partially enlarged view of a region surrounded by V in FIG. 1. (A) The partial enlarged view of the upper end part of a joining line. (B) The partial enlarged view of the lower end part of a joining line. The figure which shows a mode when (a), (b) wears a diaper. The figure similar to FIG. 5 in the modification 1. FIG. (A) The elements on larger scale of the upper end part of the joining line in the example 1 of a change. (B) The partial enlarged view of the lower end part of a joining line. The figure similar to FIG. 5 in the modification 2. The figure similar to FIG. 5 in the modification 3. (A) The figure which shows the mode of the sample cut out regarding the measuring method of the peeling strength of the direction orthogonal to a joining line. (B) The figure which shows the mode of the sample to cut out regarding the measuring method of the peeling strength of the horizontal direction of a waist belt. (C1), (c2) The figure which shows the mode of the sample to cut out regarding the measuring method of the peeling strength of the longitudinal direction of a waist belt. (A) The figure which shows a mode that the sample cut out in Fig.12 (a) was set to the tensile tester. (B) The figure which shows a mode that the sample cut out in FIG.12 (b) was set to the tensile tester. (C) The figure which shows a mode that the sample cut out in FIG.12 (c) was set to the tension tester.

  The following embodiment relates to the disposable diaper 10 shown in FIGS. 1 to 13 which is an example of the disposable wearing article of the present invention, and includes not only an indispensable structure of the invention but also a selective and preferable structure. 2 to 4, each elastic body to be described later is naturally gathered on the member to which each elastic body is attached by the contracting force in the lateral direction X and the longitudinal direction Y against the contracting force. It is in a state of being stretched to such an extent that it appears to be substantially lost visually.

  1 to 4, the diaper 10 has a longitudinal direction Y and a transverse direction X orthogonal thereto, a skin facing surface and a non-skin facing surface on the opposite side, and a length dimension in the lateral direction X divided into two equal parts. A longitudinal center line P and a transverse center line Q that bisects the length dimension in the longitudinal direction Y, and includes a front waist region 11, a rear waist region 12, a front waist region 11 and a rear waist region 12. And a crotch region 13 located between them. The diaper 10 is substantially symmetric with respect to the longitudinal center line P, and has a waist opening 14 and a pair of leg openings 15.

  The diaper 10 includes a diaper main body 16 having an absorber 23 and extending in the longitudinal direction Y, and a pair of waist belts 17 for connecting the front and rear waist regions 11 and 12. The pair of waist belts 17 are arranged substantially symmetrically with respect to the longitudinal center line P, and the diaper main body via a joining line (seal line) 18 that approaches the longitudinal center line P from the leg opening 15 side toward the waist opening 14 side. 16 is joined. The joining line 18 is formed from a plurality of joining parts 19 that are arranged at regular intervals along the front and rear end edges 16a and 16b, which will be described later. The joining portion 19 is applied by known joining means, for example, various heat welding means such as hot embossing and sonic processing. As long as the effects of the present embodiment to be described later are obtained, the joining line 18 can use a known joining means such as a hot melt adhesive in addition to the heat welding means.

<Diaper body>
The diaper main body 16 is defined by a front end edge 16a and a rear end edge 16b that are spaced apart from each other in the longitudinal direction Y, and both side edges 16c and 16d that are spaced apart from each other in the lateral direction X, and is located between the front end edges 16a. 20A, a rear end portion 20B located between the rear end edges 16b, and an intermediate portion 20C located between the front and rear end portions 20A, 20B. The front and rear end edges 16a and 16b are substantially symmetrical with respect to the vertical center line P and extend in a convex shape toward the outside in the vertical direction Y. The front and rear end portions 20A and 20B are located in the front and rear waist regions 11 and 12 of the diaper 10, respectively, and the intermediate portion 20C is located in the crotch region 13.

  The diaper main body 16 includes a liquid-permeable inner layer sheet 21 located on the skin facing surface, a liquid-impervious outer layer sheet 22 located on the non-skin facing surface, and an absorbent body located between the inner and outer layer sheets 21 and 22. 23, and a liquid-impervious or liquid-impervious leak-proof sheet 24 positioned between the absorber 23 and the outer layer sheet 22. A pair of side sheets 25 that are spaced apart from each other in the horizontal direction X and extend in the vertical direction Y are arranged on both sides of the inner and outer layer sheets 21 and 22.

The inner layer sheet 21 has a substantially hexagonal shape, and is formed of a nonwoven fabric subjected to hydrophilic treatment with a mass of about 15 to 35 g / m ² , preferably about 18 to 24 g / m ² , and a short fiber nonwoven fabric such as air-through is used. Is preferred. The outer layer sheet 22 is formed from a hydrophobic spunbond / meltblown / spunbond (hereinafter referred to as SMS) fiber nonwoven fabric or spunbond fiber nonwoven fabric having a mass of about 10 to 30 g / m ² , preferably about 15 to 25 g / m ^2. It is preferable that

  3 and 4, the absorber 23 includes front and rear end edges 23a and 23b that are curved outward in the vertical direction Y, and concave curved side edges 23c that extend in the vertical direction Y between the front and rear end edges. And a liquid-absorbent core shaped into a required shape and a liquid-diffusible core cover sheet such as tissue paper covering the liquid-absorbent core. As the liquid-absorbent core, fluff wood pulp, superabsorbent polymer particles, or a mixture thereof can be used. The liquid-absorbent core and the core cover sheet can be joined to each other using a known joining means such as a hot melt adhesive.

  The leak-proof sheet 24 is disposed so as to cover at least the entire non-skin facing surface (bottom surface) of the absorbent body 23, and a known joint such as a hot melt adhesive is interposed between the absorbent body 23 and the outer layer sheet 22. It can be joined by means. As the leak-proof sheet 24, for example, a liquid-permeable, preferably liquid-impervious and breathable plastic film can be used, and the leak-proof sheet 24 covers the entire non-skin facing surface of the absorbent body 23. Thus, the body fluid absorbed by the absorber 23 can be prevented from leaking to the outside of the diaper 10. Although not shown, the decorative element can be transmitted from the outer layer sheet 22 having a required light transmittance by using a sheet having decorative elements such as a pattern and a color as the leak-proof sheet 24.

The pair of side sheets 25 are disposed on both sides of the absorbent body 23 in the lateral direction X, and are joined between the leak-proof sheet 24 and the inner layer sheet 21 by a known joining means such as a hot melt adhesive. . The side sheet 25 is formed of a first sheet 25A located on the absorber 23 side and a second sheet 25B located on the outer layer sheet 22 side, and both sheets 25A and 25B are joined by a known means such as a hot melt adhesive. Has been. As the side sheet 25, for example, a hydrophobic SMS fiber nonwoven fabric or spunbond fiber nonwoven fabric having a mass of about 10 to 30 g / m ² can be used. Moreover, the outer side edge portion 27 in the lateral direction X of the second sheet 25B has a sleeve shape folded back to the skin facing surface side, and a plurality of leg elastic bodies 26 are disposed therein. The leg elastic body 26 is formed of a plurality of string-like or strand-like elastic materials attached so as to be contractible in the longitudinal direction Y between the front end edge 16a and the rear end edge 16b of the diaper body 16. . By arranging the leg elastic bodies 26 on both sides of the diaper main body 16, leg elastic regions 40 are formed on the outer side portions in the lateral direction X of the side edges 23 c of the absorber 23. The leg elastic region 40 extends from a joint line (front side joint line) 18 located in the front waist region 11 to a joint line (rear side joint line) 18 located in the rear waist region 12. As long as the leg elastic body 26 is attached in a stretched state so as to be contractible, the side sheet 25 may be formed from a single fiber nonwoven fabric or may be formed from an extended portion of the outer layer sheet 22.

<Waist belt>
The waist belt 17 includes a width direction and a longitudinal direction, both end edges (front and rear end edges) joined to the diaper body 16 via the joining line 18, a first side edge forming a waist opening edge, and the diaper body 16 It has the 2nd side edge which forms the leg opening 15 with both edge 16c, 16d, and the 2nd side edge has a length dimension larger than a 1st side edge, and has comprised the substantially trapezoid shape.

  The waist belt 17 is disposed so as to be contractible in an extended state in the length direction between the inner sheet 31 positioned on the skin facing surface, the outer sheet 32 positioned on the non-skin facing surface, and the inner and outer sheet 31, 32. And a plurality of waist elastic bodies 33. The waist belt 17 has a waist elastic region that can be expanded and contracted in the length direction by the waist elastic body 33 being disposed. The waist elastic region extends from the joint line 18 located in the front waist region 11 to the joint line 18 located in the rear waist region 12. In the present embodiment, the first side edges of the pair of waist belts 17 are in contact with each other on the vertical center line P. When the waist belt 17 has such a configuration, it can be formed from one elastic panel continuous on the longitudinal center line P. In such a case, the manufacturing process can be further simplified as compared with the case where the pair of waist belts 17 are formed separately. However, as for a pair of waist belt 17, the 1st side edge may mutually be spaced apart in the horizontal direction. In such a case, the length dimension of the inclined edge of the diaper main body 16 is larger than the length dimension of both end edges of the waist belt 17, and the intersection 45 has a sharp shape that protrudes upward from the waist belt 17.

As the inner and outer surface sheets 31, 32, for example, a spunbond fiber nonwoven fabric, an SMS fiber nonwoven fabric or the like having a mass of about 10 to 30 g / m ² can be used. As the waist elastic body 33, a plurality of string-like or strand-like elastic bodies that are separated from each other in the width direction and attached so as to be contractible in an extended state in the longitudinal direction can be used. In addition, the waist elastic body 33 is not restricted to this, For example, the structure which attaches a strip | belt-shaped or sheet-like elastic body may be sufficient. For joining between the sheets, known joining means such as a hot melt adhesive (not shown) or a heat welding means can be used.

  Referring to FIG. 5, the waist belt 17 has front and rear end portions 20 </ b> A and 20 </ b> B of the diaper main body 16 through the joining line 18 so that the first side edge side is the leg opening 14 side and the second side edge side is the waist opening 15 side. In a stretched state, it is joined to be contractible. The joining line 18 includes a boundary line 18 a and an outer edge 18 b between the diaper body 16 and the waist belt 17, and a pair of straight first and second lines arranged so as to be symmetric with respect to the longitudinal center line P. Formed from lines. The intersection 45 between the first line and the second line is located on the vertical center line P. The first intersection angle θ1, which is the intersection angle between the first line (or second line) of the joining line 18 located on the front waist region 11 side and the longitudinal center line P, is the first line located in the rear waist region 12 and the longitudinal center. It is larger than the second intersection angle θ2, which is the intersection angle with the line P.

  Thus, the front side (abdominal side) and the rear side (back side) of the diaper 10 when worn because the values of the intersection angles θ1, θ2 formed by the joint line 18 and the longitudinal center line P in the front and rear waist regions 11, 12 are different. And can be easily identified. In addition, by changing the intersecting angles θ1 and θ2 of the joining line 18 and changing the region where the waist elastic region is brought into contact in the front and rear waist regions 11 and 12, the joining line 18 is formed on the front waist region 11 side. The waist belt 17 extends downward in the shape of a letter C along the base and slightly extends upward in the lateral direction X, while the joining line 18 is located on both sides of the sacrum on the rear waist region side. The waist belt 17 is slightly sharpened downwardly toward the front waist region side so that the waist belt 17 extends slightly downward in the lateral direction, and the diaper 10 conforms to the body shape. Can be fitted. In the present embodiment, the front and rear end edges 16a, 16b of the diaper body 16 have a sharp shape, and the joining line 18 is positioned along the outer shape thereof, but the diaper body 16 may have a vertically long rectangular shape. Good. In such a case, the joining line 18 is not disposed along the front and rear end edges 16a and 16b, and extends in a convex shape toward the outside in the vertical direction Y so as to cut the front and rear end portions 20A and 20B.

  In the present embodiment, the joining line 18 is formed of a pair of straight first and second lines arranged so as to be symmetric with respect to the vertical center line P, and an intersection 45 thereof is a vertical center line. Although it is located on P, as long as the effect of the present invention is exhibited, the joining line 18 only needs to be inclined from the outer side in the lateral direction X toward the inner side from the leg opening 15 side to the waist opening 14 side. . That is, the intersection 45 may not be on the vertical center line P but may be shifted to the left or right as viewed from the front of the diaper 10, and in this case, a part of the joining line 18 may be located on the vertical center line. Cross with P. Moreover, although not shown in figure, in the manufacturing process of the diaper 10, the diaper main body 16 and the waist belt 17 can be formed from one laminated body. That is, in the vicinity of the boundary between the central portion and the elastic side portions while transporting a laminate having a central portion corresponding to the diaper main body 16 and elastic side portions corresponding to the waist belt 17 on both sides of the central portion in the machine direction. A leg opening 15 is formed by forming a hollow opening extending in the machine direction, and both elastic side portions are bent toward a central portion along a folding line that vertically cuts the leg opening 15, and seal lines that oppose each other in the machine direction ( The diaper 10 can be formed by joining together (corresponding to the joining line 18). According to such a manufacturing process, since the diaper main body 16 and the waist belt 17 are formed from an integral laminated body, the lower end 62 of the joining line 18 is compared with the case where they are formed separately. The sheet strength can be increased.

  The joining line 18 having such an arrangement mode includes an upper end portion 61 located on the waist opening 14 side, a lower end portion 62 located on the leg opening 15 side, and an intermediate portion 63 located between the upper end portion 61 and the lower end portion 62. And have. The joint line 18 includes a plurality of joint portions 19 and a non-joint portion 85 that is a portion where the joint portions 19 are not disposed. The joining line 18 may have a length L3 and / or an area divided into three equal parts, but does not have the intermediate part 63 and is divided into two parts, upper and lower end parts 61 and 62. May be. In the present embodiment, the upper end portion 61 and the lower end portion 62 have substantially the same length dimension and area, and are, for example, about 25 to 50% of the length dimension L3 of the joining line 18, respectively. It has a size and / or an area of about 20-50% of its total area. As long as the effects of the present invention are obtained, the area of the lower end 62 may be larger than that of the upper end 61, or the area of the lower end 62 may be larger than that of the upper end 61. In the following description, the configuration of the joint portion 19 of one line (first line) of the joint lines 18 will be described, but the other line (second line) also has the same characteristic configuration. Yes. In addition, at least one of the joining lines 18 of the front and rear waist regions 11 and 12 only needs to have the characteristic configuration of the joint portion 19, but considering the technical effects described later, the joining of the front waist region 11. Line 18 preferably has such a feature. Further, the upper end 61 and the lower end 62 mean regions having a width dimension (dimension in the length direction K) of about 30 mm from the opening edges of the waist opening 14 and the leg opening 15 which are most likely to be applied, In these regions, it is only necessary that at least one upper and lower joint portions 19A and 19B having the relationship described later exist.

  Referring to FIG. 5 and FIGS. 6A and 6B, the upper joint portion 19A has a vertically long elliptical shape, the length dimension M1 in the longitudinal direction Y is about 0.7 to 3.0 mm, and the lateral direction. The length dimension (width dimension) N1 of X is about 0.5 to 1.5 mm. The lower joint portion 19B has a horizontally long rectangular shape, the length dimension M2 in the transverse direction X is about 1.0 to 3.0 mm, and the dimension (width dimension) N2 in the longitudinal direction Y is about 0.5 to 1. 5 mm. The upper joint portion 19A and the lower joint portion 19B have substantially the same area, and the area ratios of the upper and lower joint portions 19A and 19B per predetermined area at the upper end portion 61 and the lower end portion 62 are substantially the same.

  Referring to FIG. 7A, at the lower end 62 located on the side of the leg opening 15 of the joining line 18, when the diaper 10 is pulled up, a force to pull up and a contraction action of the waist elastic body 33 move toward the waist. The force of pulling concentrates, and tearing tends to occur starting from this portion. Moreover, since the leg portion is passed in a state where the waist opening 14 is expanded before being worn, a force F1 pulling in the lateral direction X acts on the upper end portion 61 located on the waist opening 14 side of the joining line 18.

  If it is a normal pull-on (pants-type) diaper, the joint line connecting the front and rear waist belts extends almost in parallel in the vertical direction Y. If the wearer grips and pulls up both sides of the diaper, The part to be touched (force point of action) and the joining line are close to each other, and there is no body part in contact with the upper part, and only the pulling up is performed along the thigh. Never concentrate. In the diaper 10 of the present embodiment, the joining line 18 extends obliquely from the leg opening 15 side to the waist opening 14 side toward the longitudinal center line P, so that the lower end 62 abuts on the base of the thigh. Thus, when the diaper 10 is pulled upward, a part of the upper thigh is brought into contact with the lower end 62 to be prevented from moving. It will be concentrated locally. Further, since the entire waist belt 17 is gripped and pulled up, a tensile force F3 directed in a direction (diagonally upward) perpendicular to the length direction K is applied to the entire joining line 18.

  Referring to FIG. 7B, when the lower end 62 passes through the base of the thigh and moves to an appropriate position, a tensile force F2 acts on the lower end 62 upward, Since the leg elastic region 40 is extended and a force to pull downward acts, and further, the waist elastic body 33 is extended in the direction around the waist, so that these forces concentrate on the lower end 62 and are easily broken. Become. In this way, in a series of wearing operations, the lower end 62 is subjected to a force for locally peeling the lower end 62, so that the lower end 62 requires a bonding strength that does not cause peeling due to those forces. In particular, in the joining line 18, the inner surface 9 of the waist belt 17 and the inner surface 8 of the diaper main body 16 are joined to each other (see FIG. 1), so that one outer surface and the other inner surface are laminated. As compared with the case where they are joined in a state of being peeled off, they are easily peeled off. Further, a force F <b> 1 pulling in the lateral direction X and a force F <b> 3 pulling in the direction orthogonal to the length direction K are applied to the entire joining line 18.

  Thus, the joint line 18 is subjected to i) a force F1 for pulling it in the longitudinal direction Y from the leg opening 15 side to the waist opening 14 side, and ii) a force for pulling it from the inner side to the outer side in the lateral direction X. F2, iii) A force F3 for pulling in a direction perpendicular to the joining line 18 is applied. As described above, the force F1 pulling in the vertical direction Y acts most strongly (first) on the lower end 62, and therefore, the lower end 62 preferably has a high peel strength in the vertical direction Y. Moreover, since the force F2 pulling in the lateral direction X acts most strongly (first) on the upper end portion 61, the upper end portion 61 preferably has a high peel strength in the lateral direction X. Furthermore, since the force F3 pulling in the direction perpendicular to the length direction K of the boundary line 18a is applied to the intermediate portion 63 most strongly (first), the intermediate portion 63 has high peel strength in the orthogonal direction. Is preferred. In FIGS. 7A and 7B, the tensile force F1 is indicated by an arrow in the portion of the joining line 18 where these tensile forces F1 to F3 are the strongest and / or first acting. It can be said that ~ F3 acts on the entire joining line 18.

In the present embodiment, the upper joint portion 19A has a vertically long elliptical shape and is arranged in a plurality in the vertical direction Y, and the lower joint portion 19B is a horizontally long rectangular shape and is arranged in a plurality in the horizontal direction X. . Here, “a plurality of upper joint portions 19A are arranged in the longitudinal direction Y” means that the upper portion 19A has the same width (or diameter when the upper joint portion 19A is circular) and has an arbitrary upper portion. cross each other around the joint 19A, in the longitudinal direction longitudinal region extending Y S ₁ and transverse area S ₂ extending transversely X, the total area of the upper joint 19A located longitudinal region S _2, transverse area S _This means that the former is larger than the latter when compared with the total area of the upper joint portion 19 </ _b > A located at ₂ . In addition, “a plurality of lower joints 19B extending in the horizontal direction X” means that the vertical direction Y intersects with each other about the arbitrary lower joint 19B having the same width as the arbitrary lower joint 19B. In the longitudinal section S ₃ extending to the transverse area S ₄ and the transverse section S ₄ extending in the lateral direction X, the total area of the lower joint portion 19B located in the longitudinal section S ₃ and the total area of the lower joint portion 19B located in the transverse area S ₄ Means that the latter is larger than the former. Further, the longitudinal transverse areas S _{1 to} S ₄ may not be areas having a predetermined width, but may be straight lines. In such a case, for example, the sum of the length dimension on the transverse line where the transverse line extending in the lateral direction X through the center of the arbitrary lower joint part 19B overlaps with a plurality (or singular) of the lower joint parts 19B, and the center thereof If the former is larger than the latter when the longitudinal line extending in the longitudinal direction Y is compared with the sum of the lengths on the longitudinal line overlapping the plural (or singular) lower joints 19B, the lower joint 19B Can be said to be arranged in the horizontal direction X.

Referring again to FIG. 6 (a), the vertical area S _1, to the whole to the position of the three upper joint 19A, the transverse area S _2, including any on the joint 19A Only a part of the plurality of upper joint portions 19A is located. Referring also to FIG. 6 (b), the number of lower bonding portion 19B located in a transverse zone S ₄ whereas almost the entire area thereof be three are positioned, in longitudinal area S ₃ is Only a part of the three lower joint portions 19B is located. Therefore, the arrangement pattern of the upper and lower joint portions 19A and 19B in the upper and lower end portions 61 and 62 can be defined as described above.

  The upper end portion 61 forms a joint portion group composed of a plurality of upper joint portions 19A arranged in the vertical direction Y, and the lower end portion 62 is composed of a plurality of lower joint portions 19B aligned in the horizontal direction X. In the upper end 61, the peel strength in the lateral direction X is higher than the peel strength in the vertical direction Y, and in the lower end 62, the peel strength in the vertical direction Y is greater than the peel strength in the lateral direction X. The peel strength is increased. Thereby, even if the force F1 pulling in the vertical direction Y acts strongly on the lower end portion 62, it is possible to suppress the release of the lower joint portion 19B from being released.

Here, if the individual areas of the upper bonding portion 19A and the lower bonding portion 19B is substantially identical to the assumption, the total area of the lower bonding portion 19B located in a transverse zone S ₄ at the lower end 62, an upper end When comparing the total area of the lower bonding portion 19B located in a transverse zone S ₂ parts 61, the former is larger than the latter. Therefore, it can be said that the peel strength in the longitudinal direction Y at the lower end portion 62 is higher than the peel strength in the longitudinal direction Y at the upper end portion 61, and even if the force F <b> 1 that pulls it upwards acts on the lower end portion 62. Will not peel off. On the other hand, even if the peel strength in the longitudinal direction Y at the upper end portion 61 is relatively low, the force F1 pulling upward does not act strongly (first) on the upper end portion 61, so there is no possibility of peeling.

Further, the total area of the upper joint 19A located longitudinal region S ₁ of the upper portion 61, when comparing the total area of the lower bonding portion 19B located on a longitudinal area S ₃ of the lower end portion 62, the former is the latter Is bigger than. Therefore, it can be said that the peel strength in the lateral direction X at the upper end portion 61 is higher than the peel strength in the lateral direction X at the lower end portion 62, and the force F <b> 2 that pulls the upper end portion 61 from the inner side in the lateral direction X to the outer side. Even if it acts, it does not peel off easily. On the other hand, even if the peel strength in the lateral direction X at the lower end portion 62 is relatively low, the force F2 pulling in the lateral direction X does not act strongly (first) on the lower end portion 62, so there is no possibility of peeling. .

  The same effect can be obtained by arranging the joints 19 so densely that, for example, the non-joint parts 85 are not substantially present in the entire region of the joint line 18 and increasing the peel strength in all directions at the upper and lower ends 61 and 62. In this case, since the sheet member welded at the joint portion 19 is cured, the rigidity of the entire joint line 18 becomes excessively high, which may give the wearer an uncomfortable feeling. Therefore, as in this embodiment, the size of the independent upper and lower joints 19A and 9B so that the peel strength in the longitudinal direction Y is increased at the lower end 62 and the peel strength in the lateral direction X is increased at the upper end 61. By adjusting the shape, the arrangement pattern, the distribution density, and the like, it is possible to exert a peel strength in a direction suitable for each portion of the joining line 18 while suppressing an excessive increase in rigidity of the entire joining line 18.

  Referring to FIG. 6A, in order to make the peel strength in the lateral direction X of the upper end portion 61 relatively high, the separation dimension R1 in the longitudinal direction Y between the upper joint portions 19A adjacent in the longitudinal direction Y is as much as possible. For example, the separation dimension R1 is preferably 1.0 to 2.0 mm. On the other hand, when the separation distance R2 in the lateral direction X between the adjacent upper joint portions 19A in the lateral direction X is small, when the sheet breaks from the boundary line 18a, the break line of the sheet passes through the upper joint portion 19A. May extend outward in the lateral direction X. Therefore, the separation dimension R2 in the lateral direction X between the upper joint portions 19A is preferably as large as possible, and specifically, it is preferably at least 1.5 mm or more and 1.5 to 3.5 mm.

  Referring to FIG. 6B, in order to make the peel strength in the vertical direction Y of the lower end portion 62 relatively high, the separation dimension R3 in the horizontal direction X between the lower joint portions 19B adjacent in the horizontal direction X is as much as possible. It is preferable that it is small, and specifically, the separation dimension R3 is preferably 0.5 to 1.5 mm. On the other hand, when the separation dimension R4 in the longitudinal direction Y between the adjacent lower joint portions 19B in the longitudinal direction Y is small, the sheet breaks through the lower joint portion 19B when the sheet breaks from the leg opening 15 side. There is a risk of the line extending upward. Accordingly, the separation dimension R4 in the vertical direction Y between the lower joint portions 19B is preferably as large as possible, and specifically, it is preferably at least 1.0 mm or more and in the range of 1.0 to 3.0 mm.

  When the leg elastic body 26 and the waist elastic body 33 overlap with each other at the lower end 62, a force acts to pull the leg elastic body 26 in the opposite direction around the leg opening due to the mutual contraction force and to break it. Therefore, by arranging the elastic bodies 26 and 33 so as not to overlap each other in a plan view in such an overlapping region, the forces pulling in the opposite directions can be directly compared to the case where they overlap each other in the plan view. It does not act on each other, and concentration of force to break it can be avoided.

  Further, in the region where the leg elastic region overlaps the waist elastic region where the waist elastic body 33 is disposed, it is preferable that the elongation stress per unit area of both elastic regions is substantially equal. In such a case, the leg elastic region and the waist elastic region continuous around the leg opening are tightened by the same elongation stress, thereby preventing the occurrence of a gap due to a local change in the tensile stress around the leg opening and excretion. It is possible to effectively prevent side leakage of objects. As described above, in order to make the extension stresses substantially equal in the region where the leg elastic region and the waist elastic region overlap with each other, the number, fineness, and pitch of the leg elastic body 26 and the waist elastic body 33 are appropriately adjusted. There is a need.

  Although not shown, the lower joint portion 19B located at the lower end portion 62 is located at the upper end portion 61 and larger than the joint portion 19A, and the total area of the lower joint portion 19B is larger than that of the upper joint portion 19A. It is preferable. In such a case, the bonding strength of the lower end portion 62 is higher than the bonding strength of the upper end portion 61, and even if a force is applied to the lower end portion 62 during the wearing operation, it is easy to peel off. Absent. Further, when the bonding area is relatively large so that the entire bonding line 18 has a predetermined bonding strength in the same manner as the lower end portion 62, the rigidity of the entire bonding line 18 becomes relatively high, so that the wearer There is a possibility of giving a sense of incongruity when the user bends forward. In particular, when the rigidity of the upper end portion 61 is relatively high, there is a risk of irritation when the vicinity of the intersection 45 that is convex toward the waist opening 14 touches the body.

  In the intermediate portion 63, a plurality of intermediate joint portions 19C having a rectangular shape are arranged in the same manner as the lower joint portion 19B. The intermediate joint portion 19C is arranged side by side in the length direction K. Since the intermediate joint portion 19 </ b> C is arranged side by side in the length direction K, the peel strength against the force F <b> 3 pulling in the direction orthogonal to the length direction K is high. However, the intermediate joint portion 19C may be arranged side by side in the vertical direction Y and / or the horizontal direction X, and the rigidity of the entire joint line 18 can be changed by appropriately changing the shape, arrangement pattern, etc. of the intermediate joint portion 19C. And the peel strength in a certain direction can be appropriately controlled.

<Modification 1>
FIG. 8 is an example of a modified example, and is a view similar to FIG. 5 of the modified example 1. FIG. 9A is a partially enlarged view of the upper end portion 61 of the joining line 18 in the modified example 1. FIG. FIG. 6 is a partially enlarged view of a lower end portion 62 of the line 18.

  Referring to FIGS. 8 and 9A and 9B, in this modification, the upper and lower joint portions 19A and 19B are in the same shape and the same size, and the upper joint portion 19A is in the vertical direction Y. A plurality of the lower joint portions 19B are arranged in the lateral direction X.

Referring to FIG. 9 (a), the number of upper joint 19A located longitudinal region S ₁ extending in the longitudinal direction Y having the same width as the diameter D of any of the outer end joint 19A whereas is five , the transverse area S ₂ is part of any upper joint portion 19A and the other two on the joint 19A is only located. Referring also to FIG. 9 (b), whereas the lower joint portion 19B which is located in a transverse zone S ₃ region having the same width as the diameter of any inner end joint portion 19B is five, longitudinal area S ₄ Only an arbitrary lower joint portion 19B and a part of the other two lower joint portions 19B are located inside.

  In the upper end portion 61, a joint portion group composed of a plurality of upper joint portions 19A arranged in the longitudinal direction Y is formed, and in the lower end portion 62, a plurality of lower joint portions 19B arranged in the lateral direction are composed. A joint group can be formed. The upper joint portion 19A and the lower joint portion 19B have the same shape and size, and the joint portion group of the lower end portion 62 extends in the horizontal direction X, while the joint portion group of the upper end portion 61 extends in the vertical direction Y. Therefore, it can be said that the peel strength in the vertical direction Y of the lower end portion 62 is higher than that of the upper end portion 61, and the peel strength in the lateral direction X of the upper end portion 61 is higher than that of the lower end portion 62. At the lower end 62, the peel strength in the vertical direction Y is higher than the peel strength in the horizontal direction, and at the upper end 61, the peel strength in the horizontal direction X is higher than the peel strength in the vertical direction Y.

<Modification 2>
FIG. 10 is a diagram similar to FIG. 5 of Modification 2 which is an example of the modification.

  Referring to FIG. 10, in the present modification, a plurality of upper joint portions 19 </ b> A extending in the longitudinal direction Y and spaced apart from each other in the lateral direction X are separated from the outer edge 18 b of the joining line 18 at the upper end 61. Edge) 18a continuously extending. In the lower end portion 62, a plurality of lower joint portions 19B extending in the lateral direction X and spaced apart from each other in the longitudinal direction Y continuously extend from the outer edge 18b of the joining line 18 to the boundary line 18a. The number, separation dimension, and total area of the upper joint portion 19A and the lower joint portion 19B are substantially the same. Also in the arrangement pattern of the upper and lower joint portions 19A and 19B, the lower joint portion 19B extends in the horizontal direction X, while the upper joint portion 19A extends in the vertical direction Y. Is higher than that of the upper end 61, and the peel strength in the lateral direction X of the upper end 61 is higher than that of the lower end 62. At the lower end 62, the peel strength in the vertical direction Y is higher than the peel strength in the horizontal direction, and at the upper end 61, the peel strength in the horizontal direction X is higher than the peel strength in the vertical direction Y. The intermediate joint portion 19C of the intermediate portion 63 has a longitudinal direction extending in the entire width direction of the joint line 18 in the length direction of the joint line 18 and the lateral direction in the same manner as the lower joint portion 19B. And transverse portions extending to the side. When the intermediate joint portion 19C has such a shape, it can be said that the intermediate portion 19C has substantially the same peel strength in the vertical direction Y and the horizontal direction X.

<Modification 3>
FIG. 11 is a diagram similar to FIG. 5 of Modification 3 which is an example of the modification.

  In the joint line 18 of the present modification, the upper joint portion 19A of the upper end portion 61 and the lower joint portion 19B of the lower end portion 62 each have a plurality of longitudinal sections and lateral portions extending in the longitudinal direction Y from the outer edge 18b to the boundary line 18a. A plurality of transverse portions extending in the direction. The vertical sections and the cross sections of the upper and lower end portions 61 and 62 have the same width dimension, and the upper end portion 61 has more vertical sections than the cross section, and the lower end portion 62 has a cross section. Is more than the number of vertical sections. Also in the arrangement pattern of the upper and lower joint portions 19A and 19B, the area of the transverse portion of the lower joint portion 19B is larger than the area of the transverse portion of the upper joint portion 19A, and the longitudinal section of the upper joint portion 19A Since the area is larger than the area of the longitudinal section of the lower joint portion 19B, the peel strength in the longitudinal direction Y of the lower end portion 62 is higher than that of the upper end portion 61, and the peel strength in the lateral direction X of the upper end portion 61 is It can be said that it is higher than that of the lower end 62. At the lower end 62, the peel strength in the vertical direction Y is higher than the peel strength in the horizontal direction, and at the upper end 61, the peel strength in the horizontal direction X is higher than the peel strength in the vertical direction Y.

  As described above, in the embodiment and each modified example, the diaper 10 has a joint portion so as not to be peeled off by the plurality of pulling forces F1 to F3 acting on the joint line 18 during wearing and wearing operation. The size, shape, combination, and arrangement pattern of 19 are changed for each part. As a result, the peeling of the bonding portion 19 is suppressed, but the peeling strength in the direction perpendicular to the length direction K in the entire bonding line 18 is used to prevent the bonding line 18 from being peeled against these tensile forces. (The average value of the peel strength between the upper and lower end portions 61, 62 and the intermediate portion 63), the peel strength in the horizontal direction X of the upper end portion 61 and the peel strength in the longitudinal direction Y of the lower end portion 62 are each at least 10 N / 25 mm. And it is preferable that it is 15N / 25mm or more. Since the joining line 18 has peeling strength, the joining line 18 is not likely to be partly peeled off or broken during wearing operation and wearing of the diaper 10.

  Although not shown, at least one of the edge of the waist opening 14 and the edge of the leg opening 15 is fixed by folding the waist belt 17 and / or a part of the diaper main body 16 to the inner surface side. Also good. Thus, the peeling strength of the upper-lower-end parts 61 and 62 of the joining line 18 can be made high by forming the edge part of the waist opening 14 and / or the leg opening 15 with a some sheet | seat member. In addition, separate reinforcing sheets may be disposed on the edge portions, or the reinforcing sheets may be disposed only on the upper and lower end portions 61 and 62.

<Method of measuring peel strength of waist belt>
12 (a) to 12 (c) are enlarged views of a portion indicated by XII in FIG. 3, and FIG. 12 (a) is a sample to be cut out relating to a method for measuring the peel strength in the direction orthogonal to the joining line 18. FIG. 12B is a diagram showing the state of the sample to be cut out, and FIGS. 12C1 and 12C2 are the waist belt 17. It is a figure which shows the mode of the sample to cut out regarding the measuring method of the peeling strength of the vertical direction Y. FIG. 13A is a diagram illustrating a state in which the sample cut out in FIG. 12A is set in a tensile tester, and FIG. 13B is a diagram in which the sample cut out in FIG. 12B is set in the tensile tester. FIG. 13C is a diagram showing a state where the sample cut out in FIGS. 12C1 and 12C2 is set in a tensile tester. 12A to 12C and FIGS. 13A to 13C, the waist elastic body 33 is omitted for convenience of explanation.

  Each measurement of the peel strength of the waist belt 17 was measured using an autograph tester (AG-X10plus) manufactured by Shimadzu Corporation. 12 (a) to 12 (c) are enlarged views of a region surrounded by a one-dot chain line XII in FIG. In the following, only the peel strength related to the joint line 18 on the rear waist region 12 side is measured, but the joint line 18 on the front waist region 11 side also has the same peel strength. Here, the “peeling strength of the waist belt 17” means the maximum tensile force (N / 25 mm) from when the waist belt 17 begins to peel until the waist belt 17 completely separates from the diaper body 16. To do.

<Peel strength in orthogonal direction>
12 (a) and 13 (a), in the state where the joining of the joining line 18 on the front waist region 11 side is released and the waist belt 17 is extended in the lateral direction X, it intersects with the boundary line 18a. An elongated rectangular piece extending in a direction orthogonal to the length direction K was cut out from the diaper 10 to obtain a sample. The sample has a width of 25 mm, a first portion 93 including the fixed portion 35 and the free portion 36 of the waist belt 17, and a second portion 94 formed from the diaper body 16. The first portion 93 and the second portion 94 have the same shape and the same size, and part of them overlaps each other in the thickness direction Z before the waist belt 17 is deployed. In the cut-out sample, the first sheet piece 93 a composed of the free portion 36 of the first portion 93 is held by one chuck (movable jig) 95, and the second portion 94 is held by the other chuck (fixed jig) 96. The sample was set on an autograph tester while being gripped on the surface, and the peel strength (maximum strength) of the sample at a pulling speed of 1000 mm / min was determined. When the chuck width is about 50 mm and the sample cannot be cut out with a width of 25 mm, the sample is converted into a width of 25 mm based on the measurement result. As shown in FIG. 12A, samples are cut out at the upper and lower end portions 61 and 62 and the intermediate portion 63, the peel strengths in the respective orthogonal directions are obtained, and the average value is obtained as the peel strength in the direction perpendicular to the boundary joint region ( N / 25 mm).

<Lateral peel strength>
12 (b) and 13 (b), in the vicinity of the upper and lower end portions 61 and 62 of the state in which the waist belt 17 is expanded in the lateral direction X, an elongated rectangle that intersects the boundary line 18a and extends in the lateral direction X. A piece was cut out from the diaper 10 and used as a sample. The sample has a width of 25 mm, and includes a first portion 93 including the fixed portion 35 and the free portion 36 of the waist belt 17 and a second portion 94 formed from the diaper body 14. The first portion 93 and the second portion 94 partially overlap each other in the thickness direction Z before the waist belt 17 is deployed. In the cut out sample, the sheet piece 93a formed from the free portion 36 of the first portion 93 is held by one chuck (movable jig) 95, and the second portion 94 is held by the other chuck (fixed jig) 96. The sample was set in an autograph tester while being held in a grip, and the peel strength in the transverse direction X (N / 25 mm) was measured under the same conditions as the measurement of the peel strength in the orthogonal direction.

<Vertical peel strength>
12 (c1), (c2), and FIG. 13 (c), in the vicinity of the upper and lower end portions 61, 62 before the waist belt 17 is extended, it extends in the longitudinal direction Y across the boundary line 18a. An elongated rectangular piece was cut out from the diaper 10 and used as a sample. The sample has a width of 25 mm, a first portion 93 including the fixed portion 35 and the free portion 36 of the waist belt 17, and a second portion 94 made of the diaper main body 16 that faces the first portion 93 in the thickness direction Z. In a state where the waist belt 17 is relaxed and extended outward in the longitudinal direction Y, the first portion 93 is gripped by one chuck (movable jig) 95 and the second portion 94 is held by the other chuck (fixed jig) 96. The sample is set on an autograph tester while being gripped with the above, and the sample is measured under the same conditions as the measurement of the peel strength in the direction perpendicular to each other, and the peel strength in each longitudinal direction (N / 25 mm) is obtained. It was.

  In addition to the materials described in the present specification, various known materials that are usually used in this type of article can be used without limitation for the respective constituent members constituting the diaper 10. In the specification of the invention and the claims, the terms “first” and “second” are used merely 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.

A front and rear waist region, a crotch region located between the front and rear waist regions, a diaper body having an absorber, a pair of waist belts for connecting the front and rear waist regions, and a waist In the disposable wearing article including an opening and a pair of leg openings, the pair of waist belts incline from the leg opening side to the waist opening side from the lateral outer side to the inner side in the front and rear waist region. It is joined to the diaper body through a joining line,
The joining line has an upper end portion located on the waist opening side and a lower end portion located on the leg opening side, and the longitudinal peel strength at the lower end portion is the longitudinal direction strength at the upper end portion. It is characterized by being higher than the peel strength.

The present invention disclosed in the above paragraph 0061 can include at least the following embodiments.
(1) The lateral peel strength at the upper end is higher than the lateral peel strength at the lower end.
(2) The longitudinal peel strength at the lower end is at least 10 N / 25 mm.
(3) The peel strength in the lateral direction at the upper end is at least 10 N / 25 mm.
(4) The lower end portion has a plurality of joint portions arranged to be separated from each other.
(5) The upper end portion has a plurality of joint portions arranged to be separated from each other.
(6) In the said lower end part, the separation dimension between the junction parts adjacent in the said vertical direction is larger than the separation dimension between the junction parts adjacent in the said horizontal direction.
(7) In the upper end portion, a separation dimension between adjacent joint portions in the lateral direction is larger than a separation dimension between adjacent joint portions in the vertical direction.

10 Disposable wearing articles (disposable diapers)
11 Front waist region 12 Rear waist region 13 Crotch region 14 Waist opening 15 Leg opening 16 Diaper body 17 Waist belt 18 Joining line 19 Joining part 19A Joining part (upper joining part)
19B Joint (lower joint)
19C joint (intermediate joint)
23 Absorber 61 Upper end portion 62 of joining line Lower end portion 63 of joining line Intermediate portion 85 of joining line Non-joining portion R1 Vertical separation dimension R2 between upper joining portions Lateral separation dimension R3 between upper joining portions Lower end joining Separation dimension R4 in the horizontal direction between parts Vertical separation dimension K in the lower end joint part Length direction X of the joining line

Claims (8)

A front and rear waist region, a crotch region located between the front and rear waist regions, a diaper body having an absorber, a pair of waist belts for connecting the front and rear waist regions, and a waist In a disposable wearing article comprising an opening and a pair of leg openings,
The pair of waist belts are joined to the diaper main body via a joining line that inclines from the leg opening side toward the waist opening side toward the inside from the lateral outer side in the front and rear waist region,
The joining line has an upper end portion located on the waist opening side and a lower end portion located on the leg opening side, and the longitudinal peel strength at the lower end portion is the longitudinal direction strength at the upper end portion. The said wearing article characterized by being higher than peeling strength.   The wearing article according to claim 1, wherein the peel strength in the lateral direction at the upper end portion is higher than the peel strength in the lateral direction at the lower end portion.   The wearing article according to claim 1 or 2, wherein the peel strength in the longitudinal direction at the lower end is at least 10 N / 25 mm.   The wearing article according to claim 1, wherein the peel strength in the lateral direction at the upper end is at least 10 N / 25 mm.   The said lower end part is a wearing article in any one of Claims 1-4 which has the some junction part arrange | positioned mutually spaced apart.   The said upper end part is a wearing article in any one of Claims 1-5 which have several joining parts arrange | positioned mutually spaced apart.   The wearing article according to claim 5, wherein, in the lower end portion, a separation dimension between joint portions adjacent in the longitudinal direction is larger than a separation dimension between joint portions adjacent in the lateral direction.   The wearing article according to claim 6, wherein, in the upper end portion, a separation dimension between joint portions adjacent in the lateral direction is larger than a separation dimension between joint portions adjacent in the longitudinal direction.

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