JP6422810B2 - Disposable wearing articles - Google Patents

Description

  The present invention relates to a disposable wearing article.

  Conventionally, it has 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, a waist opening and a pair of leg openings Disposable wearing articles comprising are well known. For example, in the wearing article disclosed in Patent Document 1, a pair of waist belts are joined to the diaper main body via a joining line that approaches the longitudinal center line from the leg opening side toward the waist opening side.

Japanese Patent No. 2945336

  In the wearing article described in Patent Literature 1, when the waist opening is expanded in the mounting operation, a force pulling in the direction around the waist (lateral direction) acts strongly on the upper end portion of the joining line.

  Therefore, at the upper end of the joining line, it is necessary to set the peel strength against the lateral force high, but if the area of the joining part is simply increased, the rigidity of the joining line becomes excessively high, and the wearer May give a sense of incongruity.

  Therefore, an object of the present invention is to provide a disposable wearing article that is an improvement of the prior art and can increase the peel strength at the upper end of the joining line.

  In order to achieve the above object, the present invention is directed to a longitudinal direction and a lateral direction, and a longitudinal center line that bisects the lateral dimension, and a longitudinal waist region, and the longitudinal waist A disposable wearing article comprising a crotch region positioned between regions, a diaper body having an absorbent body, a pair of waist belts for connecting the front and rear waist regions, a waist opening and a pair of leg openings.

The present invention provides the above-mentioned wearing article, wherein the pair of waist belts is connected to the front and rear waist regions via a joining line that is inclined from the leg opening side to the waist opening side so as to go from the lateral outer side to the inner side. It is joined to the diaper main body, and the joining line has an upper joining part whose dimension in the longitudinal direction is larger than the dimension in the lateral direction, and a plurality of the upper joining parts are arranged in the longitudinal direction to form the longitudinal joining. An area is formed, and the joining line has the longitudinal joining area at the upper end located on the waist opening side .

  According to one or more embodiments of the disposable wearing article according to the present invention, since the joining line has a longitudinal joining area extending in the longitudinal direction at the upper end, the rigidity of the joining line is excessive at the upper end. It is possible to increase the peel strength with respect to the lateral force while suppressing the increase.

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 diaper shown as an example of the disposable wearing article which concerns on this indication. The top view which looked at the diaper shown in FIG. 1 from the skin opposing surface side of a diaper main body. The partially broken expansion | deployment top view in the state which uncouple | bonded the joining line in the front waist area in the diaper shown in FIG. FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. 2. A partially enlarged view of a region surrounded by V in FIG. (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. (C) The elements on larger scale of the intermediate part of a joining line. (A), (b): The front view which shows the state at the time of wearing the diaper shown in FIG. The figure similar to FIG. 5 of the modification 1 which is an example of the modification of a joining line. (A) The elements on larger scale of the upper end part of the joining line in the example 1 of change, (b) The elements on larger scale of the lower end part of a joining line. (C) The elements on larger scale of the intermediate part of a joining line. The figure similar to FIG. 5 of the modification 2. The figure similar to FIG. 5 of 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 tension tester. (B): The figure which shows a mode that the sample cut out in FIG.12 (b) was set to the tension tester. (C): The figure which shows a mode that the sample cut out in FIG.12 (c1) was set to the tension tester.

  The following embodiment relates to a disposable diaper shown in FIGS. 1 to 13 as an example of the present invention, and includes not only an indispensable structure of the invention but also a selective and preferable structure. 2 and 3, each elastic body to be described later is substantially free from gathers generated in the member to which each elastic body is attached due to the contraction force in the horizontal direction X and the vertical direction Y by natural vision. It is in the state extended | stretched to such an extent that it looks like.

  1-4, the diaper 10 which is an example of the disposable wearing article which concerns on this invention is the non-skin of the vertical direction Y and the horizontal direction X which cross | intersects it (orthogonal), a skin opposing surface, and its opposite side. It has a front waist region 11 having a facing surface, a vertical center line P that bisects the length dimension in the horizontal direction X, and a horizontal center line Q that bisects the length dimension in the vertical direction Y. A waist region 12 and a crotch region 13 positioned between the front waist region 11 and the rear waist region 12 are included. 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 are joined via a joining line 18 that inclines from the leg opening 15 side toward the waist opening 14 side toward the inside from the outside in the lateral direction X. Joined to the diaper body 16. The joining line 18 is formed by a plurality of joining parts 19 arranged along the front and rear end edges 16a and 16b of the diaper body 16 to be described later. The joining portion 19 is a portion to which various joining means such as known joining means such as hot embossing and sonic processing are applied. As long as the effects of the present embodiment to be described later are obtained, the joining portion 19 can use a known joining means such as a hot melt adhesive in addition to the fusion means. In the present embodiment, the front and rear waist regions 11 and 12 are portions located on the side of the waist opening 14 from the inner edge in the longitudinal direction Y of the joining line 18 in the pant-type diaper 10, and reference numerals 11 and 12 in FIG. The front and rear waist regions 11 and 12 of the diaper main body 16 are shown. As shown in the enlarged view of FIG. 1, in the joining line 18, the skin facing surfaces 8 on both side edges of the diaper body 16 and the skin facing surfaces 9 on both side edges of the waist belt 17 are joined together. ing.

<Diaper body>
The diaper main body 16 is defined by a front end edge 16a and a rear end edge 16b that face each other in the vertical direction Y, and both side edges 16c and 16d that face and face each other in the horizontal direction X. 20A and rear end portion 20B, and intermediate portion 20C located between front and rear end portions 20A and 20B. Both side edges 16c and 16d extend linearly in the vertical direction Y, the front and rear end edges 16a and 16b are convex in the center in the horizontal direction X toward the outside in the vertical direction Y, and the diaper body 16 has a substantially hexagonal shape. I am doing.

  3 and 4, the diaper main body 16 includes a liquid-permeable inner layer sheet 21 positioned on the skin facing surface, an outer layer sheet 22 positioned on the non-skin facing surface, and the inner and outer layer sheets 21 and 22. It includes an absorbent body 23 positioned, and a liquid-impervious or liquid-impervious leakproof sheet 24 positioned between the absorbent body 23 and the outer layer sheet 22. On both sides of the inner and outer layer sheets 21 and 22, a pair of side sheets 25 that are separated in the horizontal direction X and extend in the vertical direction Y are arranged.

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

  The absorber 23 has 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 23a and 23b. And a liquid diffusible core wrap sheet such as tissue paper covering the liquid absorbent core. As the absorbent core, wood fluff pulp, superabsorbent polymer particles, or a mixture thereof can be used. The liquid-absorbent core and the core wrap sheet can be joined to each other using a known joining means such as a hot melt adhesive.

  The leak-proof sheet 24 covers at least the entire non-skin-facing surface (bottom surface) of the absorber 23, and a well-known hot melt adhesive or the like (not shown) is interposed between the covering sheet of the absorber 23 and the outer layer sheet 22. It can join by a joining means. As the leak-proof sheet 24, for example, a plastic film that is hardly liquid permeable, preferably liquid-impermeable and breathable can be used.

The pair of side sheets 25 are disposed on both sides of the absorbent body 23 in the lateral direction X, have a substantially trapezoidal shape with the bottom extending in the longitudinal direction Y, and are illustrated between the leak-proof sheet 24 and the inner layer sheet 21. It can be joined by a known joining means such as hot melt adhesive. 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. The side sheet 25 includes a first side sheet 25A located on the skin facing surface side and a second side sheet 25B located on the non-skin facing surface side. The outer edge in the lateral direction X of the second side seat 25B extends outward in the lateral direction X of the first side seat 25A and has a sleeve shape folded back to the skin facing surface side. The leg elastic body 26 is arranged. The leg elastic body 26 extends in the longitudinal direction Y from the front end edge 16a to the rear end edge 16b of the diaper body 16. As the leg elastic body 26, it is possible to use at least one string-like or strand-like elastic material attached so as to be contractible in the stretched state in the longitudinal direction Y. 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 of the side edges 23 c of the absorbent body 23 in the lateral direction X. The leg elastic region 40 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. 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>
2 and 3, the waist belt 17 includes a length direction and a width direction orthogonal to the length direction, a first side edge and a second side edge extending in the length direction and spaced apart from each other in the width direction, and a first side edge. The first end edge and the second end edge extend from the side edge to the second side edge and are separated from each other in the length direction. In addition, the length direction of the waist belt 17 corresponds with the vertical direction Y of the diaper 10 in FIG. 2, and the width direction corresponds with the horizontal direction X of the diaper 10 in FIG. The first edge is located in the front waist region 11, the second edge is located in the rear waist region 12, the first side edge forms a waist opening 14, and the second side edge forms a leg opening 15 To do. Each of the first and second end edges is joined to the front and rear end edges 16 a and 16 b of the diaper main body 16 in the joining line 18. 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. The waist belt 17 has a free portion 36 extending in the direction around the waist between a fixed portion 35 bonded to the diaper main body 16 via a bonding line 18 described later and a fixed portion 35 positioned in the front and rear waist regions 11 and 12. Have. 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 simplified as compared with the case where the pair of waist belts 17 are formed separately. However, the pair of waist belts 17 may have their first side edges spaced apart from each other in the lateral direction X. 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.

The waist belt 17 is attached 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 belt elasticities extending in the length direction. A body 33. The inner and outer surface sheets 31 and 32 have substantially the same shape and size, and have a substantially trapezoidal shape with the bottom extending in the vertical direction Y in the plan view shown in FIG. 2. For example, the mass is about 10 to 30 g / m ² . Spunbond fiber nonwoven fabric, SMS fiber nonwoven fabric, etc. can be used. As the belt elastic body 33, a plurality of string-like or strand-like elastic bodies that are spaced apart from each other in the width direction and attached in a stretched state in the length direction can be used. The belt elastic body 33 is not limited to this, and may be a configuration in which, for example, a belt-like or sheet-like elastic body is attached. For joining between the sheets, known joining means such as a hot melt adhesive (not shown) can be used. As long as the effects of the present invention to be described later are exhibited, the waist belt 17 can be made of an elastic fiber nonwoven fabric made of elastomer fibers that does not have the belt elastic body 33. In addition, 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, so as to face each other in the machine direction. The diaper 10 can be formed by joining together. 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 pair of waist belts 17 are joined to the skin facing surface side of the diaper main body 16 via the joining line 18 in the front and rear waist regions 11 and 12. When the waist belt 17 is joined to the non-skin facing surface side of the diaper main body 16, the front and rear end edges 16 a and 16 b and the joint portion 19 of the diaper main body 16 are located on the inner surface side of the diaper 10 in the worn state, and feel uncomfortable when hitting the skin. There is a risk of giving. In the diaper 10 of the present embodiment, the inner sheet 31 of the waist belt 17 is joined to the skin facing surface of the diaper main body 16, and the joined portion 19 is located on the non-skin facing surface side of the diaper 10, so It is not.

  When FIG. 2 is referred, the dimension L1 of the longitudinal direction Y of the diaper 10 (diaper main body 16) is about 550-875 mm, and the dimension of the longitudinal direction Y of the absorber 23 is about 440-780 mm. The dimension L2 of the absorbent body 23 preferably has a size of about 65 to 95% of the dimension L1 of the diaper 10 (diaper body 16). Usually, the longitudinal dimension of the absorbent body is about 60% of the longitudinal dimension of the pants-type diaper, and is formed only from a sheet member positioned outside the absorbent body in the longitudinal direction. The area of the part is relatively large. In the present embodiment, the absorbent body 23 has a length dimension sufficient to exhibit the required absorption performance, while comparing the area of the portion consisting only of the sheet member positioned outside in the longitudinal direction Y. By making it small, it can manufacture with fewer materials and can suppress manufacturing cost. Further, since the front and rear end edges 23a and 23b of the absorbent body 23 and the front and rear end edges 16a and 16b of the diaper main body 16 are close to each other as compared with a normal pants-type diaper, the waist opening 14 in the worn state has the umbilical portion. It becomes a wearing aspect of a low waist type (low rise type) which is located below.

<Joint line>
The joint line 18 has a pair of straight first and second lines arranged so as to be symmetric with respect to the longitudinal center line P in the front and rear waist regions 11 and 12. In the present embodiment, the intersection 45 between the first line and the second line is located on the vertical center line P. However, as long as the effect of the present invention is exhibited, the joining line 18 is connected to the waist opening from the leg opening 15 side. What is necessary is just to incline so that it may go to the inner side from the outer side of the horizontal direction X to 14 side. That is, the intersection 45 may be located not on the vertical center line P but on either side of the diaper 10 as viewed from the front. The first and second lines may be curved. Referring to FIG. 3, the first intersection angle θ <b> 1, which is the intersection angle between the first line (or the second line) of the joint line 18 located in the front waist region 11 and the longitudinal center line P, is a joint located in the rear waist region 12. It is preferable to be larger than the second intersection angle θ2 that is the intersection angle between the first line (or the second line) of the line 18 and the longitudinal center line P. As the values of the angles of intersection θ1 and θ2 are different in this way, the waist belt 17 has a shape in which the end rises toward the outside in the lateral direction X on the front side, and the movement of the legs is not hindered. The belt 17 has a shape in which the end is lowered toward the outer side in the lateral direction X, and it is difficult to bite into the collar part, so that the belt 17 can be fitted so as to cover the entire collar part.

  Referring to FIG. 5, the joining line 18 having such an arrangement mode includes a plurality of joining portions 19 and a non-joining portion 85 in which the joining portions 19 are not disposed, and a boundary line (inner edge) with the diaper main body 16. 18a, outer edge 18b, upper end portion 61 located on the waist opening 14 side, lower end portion 62 located on the leg opening 15 side, and intermediate portion 63 located between the upper end portion 61 and the lower end portion 62. Have. 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 waist region of the joint lines 18 of the front and rear waist regions 11 and 12 only needs to have the characteristic configuration of the joint portion 19.

  In the joint part 19, the upper joint part 19 </ b> A located at the upper end part 61 forms a plurality of first joint areas (vertical joint areas) 81 extending in the longitudinal direction Y, and the lower joint part 19 </ b> B located at the lower end part 62. Forms a plurality of second joining areas (lateral joining areas) 82 extending in the transverse direction X, and the intermediate joining part 19C located in the intermediate part 63 has a plurality of second joining areas 18 extending in the length direction K of the joining line 18. Three joint areas (intermediate joint areas) 83 are formed. Here, the length direction K of the joining line 18 refers to a direction in which an imaginary straight line connecting both end edges of the boundary line 18a of the joining line 18 extends. In the present embodiment, the length direction K coincides with the direction in which the boundary line 18a extends. . Further, the upper end portion 61 and the lower end portion 62 respectively mean regions having dimensions of at least about 30 mm in the length direction K from the opening edges of the waist opening 14 and the leg opening 15 that are most likely to be applied with force. It is sufficient that at least one of each of the first and second joining areas 81 and 82 is present. The first joining area 81, the second joining area 82, and the third joining area 83 are each composed of a plurality of joint portions 19 arranged discontinuously.

Referring to FIG. 6A, at the upper end 61, a plurality of first joining areas 81 are arranged apart from each other in the length direction K. A plurality of upper joint portions 19 </ b> A that form the first joint area 81 are arranged in the longitudinal direction Y. In the present embodiment, the upper joint portions 19 </ b> A are long in the longitudinal direction Y. Here, “a plurality of upper joint portions 19A are arranged in the vertical direction Y” means that the upper joint portion 19A has the same width as the horizontal direction X (width size) in the vertical direction Y. and the total area of the upper joint 19A located longitudinal region S ₁ which extends, the total area of the upper joint portion 19A which is located in a transverse zone S ₂ extending transversely X have the said longitudinal cross-sectional area S ₁ of the same width This means that the former is larger than the latter when compared. Further, the longitudinal transverse areas S ₁ and S ₂ may not be areas having a predetermined width, but may be straight lines. In such a case, for example, the sum of the length dimensions on the longitudinal line where the longitudinal line extending in the longitudinal direction Y through the center of the arbitrary upper joint part 19A overlaps with a plurality (or singular) of the upper joint part 19A, and the center If the former is larger than the latter when the transverse line extending in the transverse direction X is compared with the sum of the lengths on the transverse line overlapping the plural (or singular) upper joints 19A, the upper joint 19A Can be said to be arranged in the vertical direction Y. In the illustrated example, in the longitudinal section S ₁ having the same width as the dimension (width dimension) N1 in the lateral direction X of the arbitrary upper joint portion 19A and extending in the longitudinal direction Y, the area of the upper joint portion 19A is three ( while having a total area of 3 times) the area of the upper bonding portion 19A, the transverse area S _2, and has a two minute or less of the total area of the area of the upper bonding portion 19A. In the present embodiment, the upper joint portion 19A has a vertically long substantially elliptical shape, but the shape is not limited to this, and for example, a vertically long polygonal shape such as a rectangular shape, a curved shape that is long in the vertical direction Y, or the like. May be.

  The dimension (length dimension) M1 in the longitudinal direction Y of the upper joint portion 19A is about 1 to 5 mm, preferably about 1.1 to 5 times the dimension (width dimension) N1 in the lateral direction X. In the embodiment, the dimension M1 is 1.5 mm and the dimension N1 is 1 mm so as to be about 1.5 times. In addition, the separation dimension (the distance between the non-joint portions between the adjacent upper joint portions 19A) R1 in the vertical direction Y is the separation dimension of the upper joint portions 19A that are adjacent to each other in the lateral direction X. , And the separation dimension R2 of the first joint areas 81A and 81B adjacent to each other in the lateral direction X is smaller. The separation dimension R1 is about 0.5 to 2 mm, and the separation dimension R2 in the lateral direction X is preferably about 1.2 to 5 times the separation dimension R1 in the longitudinal direction Y. In this embodiment, the separation dimension R1 The dimension R1 is 1.5 mm and the separation dimension R2 is 2.5 mm.

Referring to FIG. 6 (b), a plurality of second joining sections 82 are arranged at a distance from each other in the length direction K at the lower end 62. A plurality of joining portions 19 (hereinafter referred to as lower joining portions 19B) forming the second joining area 82 are arranged in the lateral direction X, and in the present embodiment, have a shape that is long in the lateral direction X. Here, “the plurality of lower joint portions 19B are arranged in the horizontal direction X” means that the arbitrary lower joint portion 19B has the same width as the vertical direction Y (width size) in the horizontal direction X. and the total area of the lower bonding portion 19B located in a transverse zone S ₃ which extends, the total area of the lower bonding portion 19B located on a longitudinal area S ₄ extending in the longitudinal direction Y have the same width as the transverse area S ₃ This means that the former is larger than the latter when compared. Further, the longitudinal transverse areas S ₃ and 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. In the present embodiment, the lower joint portion 19B has a horizontally long substantially rectangular shape, but the shape is not limited to this, and may be, for example, an elliptical shape or a curved shape that is long in the horizontal direction X.

  The dimension (length dimension) M2 in the lateral direction X of the lower joint portion 19B is preferably about 1.1 to 5 times the dimension (width dimension) N2 in the lateral direction X. In addition, the separation dimension of the lower joint portions 19B adjacent to each other in the horizontal direction X (the distance between the non-joint portions between the adjacent lower joint portions 19B) R3 is the separation dimension of the lower joint portions 19B adjacent to each other in the vertical direction Y. , And the distance R4 between the second joining areas 82 adjacent to each other in the longitudinal direction Y.

Referring to FIG. 6C, in the intermediate portion 63, a plurality of third joining sections 83 are arranged apart from each other in the direction orthogonal to the length direction K (the width direction of the joining line 18). A plurality of joint portions 19 (hereinafter referred to as intermediate joint portions 19C) forming the third joint section 83 are arranged in the length direction K. In the present embodiment, the shape is a rectangular shape extending in the length direction K. Is not limited thereto, and may be, for example, an elliptical shape extending in the length direction K, a curved shape, or the like. Here, “the plurality of intermediate joints 19C are arranged in the length direction K” means that the first inclined region having the same width as the width dimension and extending in the length direction K in any intermediate joint 19C. intermediate joint located on the second inclined region S ₆ which extends in a direction perpendicular with the total area of the intermediate joint 19C, has the same width and the first inclined area S ₅ to the longitudinal direction K located S ₅ This means that the former is larger than the latter when compared with the total area of 19C. Further, the first and second inclined regions S ₅ and S ₆ may not be a region having a predetermined width but may be a straight line. In such a case, for example, the first inclined line extending in the length direction K through the center of an arbitrary intermediate joint portion 19C has a length dimension on the first inclined line overlapping with a plurality (or a single number) of intermediate joint portions 19C. When the total is compared with the sum of the lengths on the second inclined line where the second inclined line extending in the direction perpendicular to the length direction K through the center overlaps with a plurality (or singular) of intermediate joints 19C In addition, when the former is larger than the latter, it can be said that the intermediate joint portions 19C are arranged in the length direction K. In the illustrated example, however, the length dimensions of the first and second inclined regions S ₅ and S ₆ are the same, and the same dimension as the width dimension of the joining line 18. Has a width dimension N3 same width for any intermediate joint 19C, the number of intermediate joint 19C located in the first inclined area S ₅ extending in the longitudinal direction K is a three, their substantially the entire region Although located in the second inclined region S _6, only a part of the three intermediate joint 19C is located.

  The length dimension M3 of the intermediate joint 19C is preferably about 1.1 to 5 times the width dimension N3. In addition, the separation dimension (the distance of the non-joined portion between the adjacent intermediate joints 19C) R5 in the length direction K is an intermediate distance between the adjacent intermediate joints 19C in the direction perpendicular to the length direction K. It is smaller than the separation dimension R6 of the joint 19C. The separation dimension R6 is preferably about 1.2 to 5 times the separation dimension R5 in the length direction K. In the third joint sections 83A and 83B adjacent in the width direction of the joint line 18, the non-joint portion located between the intermediate joint 19C in one third joint section 83A is the intermediate joint in the other third joint section 83B. The non-joining part located between the parts 19C and the joining line 18 do not overlap each other in the width direction. In the intermediate portion 63, when an arbitrary straight line extending in the width direction of the joining line 18 is drawn, at least one intermediate joining portion 19C exists on the straight line.

  The intermediate portion 63 may be provided with either one of the first bonding area 81 and the second bonding area 82 instead of the intermediate bonding portion 19C. The first joining area 81 may be disposed on the upper end 61 side, and the second joining area 82 may be disposed on the lower end 62 side. As described above, by appropriately changing the joint portion arranged in the intermediate portion 63, the rigidity of the entire joint line 18 and the peel strength in a certain direction can be appropriately controlled.

  With reference to FIGS. 7A and 7B, in the operation of wearing the diaper 10, the upper end 61 located on the side of the waist opening 14 of the joining line 18 contracts the belt elastic body 33 when the waist opening 14 is expanded. As a result, a force F1 pulling in the direction around the waist (lateral direction X) acts strongly. In the case of a normal pants-type diaper, the joint line connecting the front and rear waist belts extends substantially in parallel in the longitudinal direction Y. When the wearer grips and pulls up both sides of the diaper, The action point of the force) and the joining line are close to each other, and the tensile force is not concentrated on the upper end portion of the joining line. In the diaper 10 of the present embodiment, the joining line 18 is obliquely extended from the leg opening 15 side to the waist opening 14 side toward the longitudinal center line P, whereby the upper end portion 61 is pulled outward in both lateral directions X. The power will be concentrated. Usually, when a tensile force acts in a certain direction, the peel strength is higher when the joint is orthogonal / intersect to the force acting direction than when the joint extends in the force acting direction.

  In the present embodiment, since a plurality of first joining areas 81 extending in the longitudinal direction Y are formed at the upper end portion 61 of the joining line 18, the joining area is increased with respect to the acting direction of the force F1 to increase the peel strength. Can do. When the area of the joint portion 19 is relatively large in the joining line 18 in order to increase the peel strength, the rigidity of the joining line 18 as a whole becomes relatively high, which may give the wearer a feeling of strangeness. In the upper end portion 61, the plurality of first joining areas 81 are arranged apart from each other in the length direction K of the joining line 18, and the non-joining portion 85 is positioned therebetween, so that the rigidity becomes excessively high. Can be suppressed. At the upper end 61 where such a first joining area 81 is located, the peel strength in the lateral direction X between the diaper body 16 and the waist belt 17 is higher than the peel strength in the longitudinal direction Y. In the upper end portion 61, the peel strength in the lateral direction X is preferably 10 N / 25 mm or more, and more preferably 15 N / 25 mm or more. Furthermore, since the upper joint portion 19A in the present embodiment has a shape extending in the vertical direction Y, the individual upper joint portions 19A also have high peel strength with respect to the force F1 in the lateral direction X.

  The first joining area 81 is a plurality of upper joining portions 19A arranged in the longitudinal direction Y, and non-joining portions are located between the upper joining portions 19A, so that the rigidity of the joining line 18 is further reduced. can do. In addition, by providing such a non-joined portion in the first joining area 81, when tearing occurs in the upper end portion 61, the sheet continuously breaks in the longitudinal direction Y along the upper joining portion 19A. Can be prevented.

  Referring to FIG. 6A, in the first joint areas 81A and 81B adjacent in the lateral direction X, the non-joint portion located between the upper joint portion 19A in one first joint section 81A is the other first joint section. The non-joining portion located between the upper joining portions 19A in the joining area 81B does not overlap with each other in the lateral direction X. As described above, the upper joint portions 19A that form the plurality of first joint sections 81 are arranged in a staggered manner, and when the upper end portion 61 draws an arbitrary straight line extending in the lateral direction X, There is at least one upper joint 19A. By disposing the upper joint portion 19A that forms the first joint section 81 in this manner, when the upper end portion 61 is broken in the lateral direction X, the break line is prevented from continuously extending in the lateral direction X. can do.

  Referring to FIGS. 7A and 7B, the lower end 62 of the joining line 18 is in contact with the buttocks in the wearing operation, so that the force F2 that pulls upward when the waist belt 17 is pulled up is strong. Works. In the present embodiment, since a plurality of second joining areas 82 extending in the lateral direction X are formed at the lower end 62 of the joining line 18, the joining area is increased with respect to the acting direction of the force F <b> 2 to increase the peel strength. Can do.

  Further, since the waist belt 17 is gripped and pulled up, a tensile force F3 is applied to the entire joining line 18 in a direction perpendicular to the joining line 18 (obliquely upward). In the present embodiment, since the third joining region 83 extends in the length direction K of the joining line 18 in the intermediate portion 63, the peel strength in the direction orthogonal to the boundary line 18a of the joining line 18 is high. In the joining line 18, the peel strength in the direction orthogonal to the length direction K is preferably at least 10 N / 25 mm. In FIGS. 7A and 7B, the portions where the tensile forces F <b> 1 to F <b> 3 are most strongly applied in the joint line 18 are indicated by arrows, but the tensile forces F <b> 1 to F <b> 3 are the entire joint line 18. It can be said that it acts on.

  The diaper 10 may be fixed by bending a part of the waist belt 17 and / or the diaper main body 16 toward the inner surface at at least one of the edge of the waist opening 14 and the edge of the leg opening 15. . As described above, the edges of the waist opening 14 and / or the leg opening 15 are formed of a plurality of sheet members, and the rigidity is higher than that of the adjacent portions, whereby the upper and lower ends 61 and 62 of the joining line 18 are obtained. The peel strength of can be further increased. 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.

<Modification 1>
FIG. 8 is a view similar to FIG. 5 of Modification 1, which is an example of a modification of the joining line 18. FIG. 9A is a partially enlarged view of the upper end portion 61 of the joining line 18 in Modification 1. (B) is a partially enlarged view of the lower end portion 62 of the joining line 18, and (c) is a partially enlarged view of the intermediate portion 63 of the joining line 18.

  In this modification, the upper and lower joint portions 19A and 19B and the intermediate joint portion 19C are all in the same shape and the same dot shape. A plurality of upper joint portions 19 </ b> A are arranged in the longitudinal direction Y and form a first joint section 81. A plurality of lower joint portions 19 </ b> B are arranged in the lateral direction X to form a second joint section 82. A plurality of intermediate joint portions 19 </ b> C are arranged in the length direction K of the joint line 18, and form a third joint section 83.

  In the first bonding area 81, the separation dimension R1 of the upper bonding portions 19A adjacent to each other in the vertical direction Y is the separation dimension of the upper bonding portions 19A adjacent to each other in the horizontal direction X and the first bonding adjacent to each other in the horizontal direction X. It is smaller than each of the separation dimensions R2 of the areas 81A and 81B. In the second bonding area 82, the separation dimension R3 of the lower bonding portions 19B adjacent to each other in the horizontal direction X is the separation dimension of the lower bonding portions 19B adjacent to each other in the vertical direction Y and the second bonding adjacent to each other in the vertical direction Y. It is smaller than each of the separation dimensions R4 of the areas 82A and 82B. In the third joint section 83, the separation dimension R5 of the intermediate joint 19C adjacent to each other in the length direction K is smaller than the separation dimension R6 of the intermediate joint 19C adjacent to each other in the direction orthogonal to the length direction K. Moreover, it is preferable that the diameter M of the joint part 19 is larger than each of the separation dimensions R1, R3, and R5. The diameter M of the joint portion 19 is about 1 to 10 mm, and in this embodiment is about 2 mm.

  Thus, even if the upper and lower joint portions 19A and 19B and the intermediate joint portion 19C have the same shape and the same size, a plurality of first joints extending in the vertical direction Y can be formed at the upper end portion 61 by changing the arrangement pattern. The area 81 can be formed, and the peel strength in the lateral direction X can be increased. Further, the peel strength in the longitudinal direction Y can be increased by the second joining area 82 at the lower end portion 62, and the peel strength in the direction orthogonal to the length direction K of the joining line 18 can be enhanced at the intermediate portion 63.

<Modification 2>
FIG. 10 is a view similar to FIG. 5 of Modification 2 which is an example of a modification of the joining line 18.

  In the present modification, a plurality of first joining areas 81 are arranged at the upper end portion 61 so as to be separated from each other in the length direction K of the joining line 18, and the first joining areas 81 are separated from the outer edge 18 b of the joining line 18. The upper joint portion 19A extends continuously in the longitudinal direction Y to the boundary line (inner edge) 18a. In the lower end portion 62, a plurality of second joining areas 82 are arranged apart from each other in the length direction K of the joining line 18, and the second joining area 82 extends from the outer edge 18b of the joining line 18 to the boundary line 18a. It consists of the lower joint part 19B continuously extended to the horizontal direction X. The separation dimension R2 in the lateral direction X of the first joining area 81 and the separation dimension R4 in the longitudinal direction Y of the second joining area 82 are about 1 to 10 mm, respectively. As described above, since the plurality of first joining sections 81 extending in the longitudinal direction Y are arranged continuously in the entire width dimension of the joining line 18 at the upper end 61, the upper end 61 has a peel strength in the lateral direction X. Get higher. In addition, in the lower end portion 62, the plurality of second joining areas 82 extending in the lateral direction X are arranged continuously across the entire width dimension of the joining line 18, thereby increasing the peel strength in the longitudinal direction Y.

  The dimension (length dimension) in the longitudinal direction Y of the first joining area 81 is approximately 4 to 15 mm, and is approximately 7 mm in the present embodiment, and the dimension (width dimension) in the lateral direction X is approximately 0.5 mm. -5 mm, which is approximately 1 mm in the present embodiment, and the separation dimension R2 of the first joining area 81 in the present embodiment is approximately 4 mm.

  The middle joint portion 19C located in the middle portion 63 includes a first joint section 81 extending across the entire width dimension of the joint line 18 in the same manner as the upper joint portion 19A, and a second joint extending in the lateral direction in the same manner as the lower joint portion 19B. The areas 82 have shapes alternately arranged in the length direction K of the joining line 18. The separation dimension in the lateral direction X of the first joining area 81 located in the intermediate part 63 is larger than the separation dimension R2 of the first joining area 81 in the upper end part 61. It can be said that the intermediate part 63 </ b> C has such a shape, so that the intermediate part 63 has substantially the same peel strength in the vertical direction Y and the horizontal direction X.

<Modification 3>
FIG. 11 is a view similar to FIG. 5 of Modification 3 which is an example of a modification of the joining line 18.

  In the present modification, in the joining line 18, the upper and lower joining portions 19A, 19B of the upper and lower end portions 61, 62 respectively cross the plurality of first joining areas 81 extending in the longitudinal direction Y from the outer edge 18b to the boundary line 18a. A plurality of second joining areas 82 extending in the direction X. The first bonding area 81 and the second bonding area 82 of the upper and lower bonding portions 19A and 19B have substantially the same width dimension, and the number of the first bonding areas 81 is the second bonding area 82 at the upper end 61. In the lower end 62, the number of the second joint areas 82 is larger than the number of the first joint areas 81. Specifically, in the upper end portion 61, the separation dimension R2 in the lateral direction X of the first joining area 81 is smaller than the separation dimension in the longitudinal direction Y of the second joining area 82, and is about 1 to 10 mm. Further, in the lower end portion 62, the separation dimension R4 in the longitudinal direction Y of the second joint area 82 is smaller than the separation dimension in the lateral direction X of the first joint area 81, and is about 1 to 10 mm.

<Method of measuring peel strength of waist belt>
FIG. 12A is a diagram showing the state of a sample to be cut out regarding the method for measuring the peel strength in the direction orthogonal to the joining line 18, and FIG. 12B is the method for measuring the peel strength in the lateral direction X of the waist belt 17. FIGS. 12 (c1) and 12 (c2) are diagrams showing the state of the sample to be cut out regarding the method of measuring the peel strength in the longitudinal direction Y of the waist belt 17. FIG. 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 in which the sample cut out in FIG. 12C1 is set in a tensile tester. In FIGS. 12A to 12C and FIGS. 13A to 13C, the belt elastic body 33 is omitted for convenience of explanation. 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.

  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 (c2) 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.

<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 before the waist belt 17 is deployed (see FIG. 2). In the cut out sample, the 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. In this state, the sample was set on an autograph tester, 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, 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 partially overlap each other in the thickness direction before the waist belt 17 is deployed (see FIG. 2). 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. In a state where the waist belt 17 is relaxed and extended to the outside in the longitudinal direction Y, the sheet piece 93a composed of the free portion 36 of the first portion 93 is gripped by one chuck (movable jig) 95, and the second portion With the sample 94 held by the other chuck (fixing jig) 96, the sample was set on an autograph tester, and the sample was measured under the same conditions as the measurement of peel strength in the orthogonal direction. The peel strength (N / 25 mm) in the direction was determined.

  For each constituent member constituting the diaper 10 of the present invention, various known materials that are usually used in this type of article can be used without limitation in addition to the materials described in the specification. In the specification and claims, the terms “first” and “second” are used only 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 a disposable wearing article comprising an opening and a pair of leg openings, the pair of waist belts are inclined in the front-rear waist region from the leg opening side to the waist opening side so as to go from the lateral outer side to the inner side. Is joined to the diaper main body via a joining line, and the joining line has an upper joining part whose dimension in the longitudinal direction is larger than the dimension in the lateral direction, and the upper joining part is in the longitudinal direction. A plurality of the longitudinal joining areas are formed side by side, and the joining line has the longitudinal joining areas at the upper end portion located on the waist opening side.

The present invention disclosed in the above paragraph can include at least the following embodiments.
(1) The vertical joint area is formed by the upper joint portions arranged in a plurality at intervals in the lateral direction.
( 2 ) The separation dimension of the upper joint part adjacent in the vertical direction is smaller than the separation dimension of the upper joint part adjacent in the horizontal direction.
(3) in the transverse direction to the longitudinal junction zones adjacent to each other in a non-bonding portion located between the upper joint in one of the longitudinal joint region is located between the upper joint of the other longitudinal junction zones The non-joined portion and the lateral direction do not overlap each other.
( 4 ) In the longitudinal joining area, the diaper main body and the waist belt are fused to each other.
( 5 ) In the upper end portion, the peel strength in the lateral direction between the diaper main body and the waist belt is higher than the peel strength in the longitudinal direction.
( 6 ) In the said upper end part, the peeling strength in the said horizontal direction of the said diaper main body and the said waist belt is 10 N / 25mm or more.
( 7 ) The joining line has a lower end portion located on the leg opening side and an intermediate portion located between the upper and lower end portions, and is continuous in the length direction of the joining line at the intermediate portion. Having an intermediate joint area extending continuously or discontinuously.

DESCRIPTION OF SYMBOLS 10 Diaper 11 Front waist area 12 Rear waist area 13 Crotch area 14 Waist opening 15 Leg opening 16 Diaper body 17 Waist belt 18 Joining line 19 Joining part 81 1st joining area (longitudinal joining area)
82 2nd joining area (horizontal joining area)
83 3rd joining area (intermediate joining area)
X Horizontal direction Y Vertical direction

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 joining portion in which the dimension in the longitudinal direction is larger than the dimension in the transverse direction,
A plurality of the upper joint portions are arranged in the longitudinal direction to form a longitudinal joint area,
The said wearing line has the said longitudinal joining area in the upper end part located in the said waist opening side, The said wearing article characterized by the above-mentioned. The wearing article according to claim 1, wherein the longitudinal joining area is formed by the upper joining portions arranged in a plurality in the transverse direction at intervals . The wearing article according to claim 1 or 2 , wherein a separation dimension of the upper joint part adjacent in the longitudinal direction is smaller than a separation dimension of the upper joint part adjacent in the lateral direction. In the longitudinal joint areas adjacent in the transverse direction, the non-joint portion located between the upper joint portions in one longitudinal joint section is the non-joint portion located between the upper joint portions in the other longitudinal joint section. The wearing article according to claim 1, which does not overlap with each other in the lateral direction. The wearing article according to any one of claims 1 to 4 , wherein the diaper main body and the waist belt are fused to each other in the longitudinal joining area. The wearing article according to any one of claims 1 to 5 , wherein, in the upper end portion, the peel strength in the lateral direction between the diaper main body and the waist belt is higher than the peel strength in the longitudinal direction. The wearing article according to any one of claims 1 to 6 , wherein, in the upper end portion, a peel strength in the lateral direction between the diaper main body and the waist belt is 10 N / 25 mm or more. The joining line has a lower end portion located on the leg opening side and an intermediate portion located between the upper and lower end portions, and is continuous or non-continuous in the length direction of the joining line at the intermediate portion. The wearing article according to any one of claims 1 to 7 , further comprising an intermediate joint area extending continuously.

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