Pants-type disposable wear

Abstract

To prevent displacement of a sheet while improving feeling near a waist opening.SOLUTION: A waist part W has: an outside part 18 where a first sheet 12S and a second sheet 12H are layered; an inside part 19 where the first sheet 12S and the second sheet 12H following from the outside part 18 are folded back inward at an edge of a waist opening WO; a plurality of waist elastic members 17 between the outside part 18 and the inside part 19; and a bonded part 80 where the first sheet 12S and the second sheet 12H are welded and bonded at a bonding position 90 following a back and forth direction LD across the outside part 18 and the inside part 19. An area of each bonded part 80 of a first part P1 positioned on the waist opening WO side of the outside part 18 is smaller than an area of each bonded part 80 of a second part P2 positioned opposite, and a gap k1 in the back and forth direction LD of the bonded part 80 in the first part P1 is as wide as or wider than a gap k2 in the back and forth direction LD of the bonded part 80 in the second part P2.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a pants-type disposable wearing article having improved feel (softness and cushioning) on ​​the edge of a waist opening. [Background technology]

[0002] A pants-type disposable wearing article generally comprises an outer body that constitutes at least the waist area of ​​a front and a back body, and an inner body that is attached to the outer body so as to extend from the front body to the back body, and both sides of the outer body of the front body and both sides of the outer body of the back body are joined to form side seals, thereby forming a waist opening and a pair of leg openings on the left and right (e.g., Patent Documents 1 and 2).

[0003] In a typical pants-type disposable wearing article, the region including the waist portion of the outer body has a laminated structure in which an elastic member is interposed between a plurality of sheet layers in order to ensure a good fit to the body.

[0004] In pants-type disposable wearing articles, the texture (feel, feel, and sensation) of the edge of the waist opening when the product is held in the hand for putting on or purchasing, or while being worn, is very important.

[0005] For this reason, the exterior body described in Patent Document 1 is proposed to have an outer portion where the first and second sheets are laminated from the lower waist portion to the waist portion, and an inner portion where the first and second sheets continuing from this outer portion are folded inward at the edge of the waist opening and at least one of the sheets extends over the entire waist portion, and the portion of one sheet exposed to the outside that runs from the outer portion through the edge of the waist opening to the inner portion is a free portion that is not fixed to the other sheet. The presence of such a free portion improves the flexibility and cushioning of the waist portion and provides a good texture.

[0006] However, if such loose parts exist, when the first and second sheets are folded to form the edge of the waist opening, the first and second sheets may shift, causing unnecessary rolling up or wrinkles.In addition, when the product is worn, the first and second sheets may shift, causing a decrease in the fit of the waist area. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2016-067436 A [Patent Document 2] International Publication No. 2018 / 154684 Summary of the Invention [Problem to be solved by the invention]

[0008] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, a main object of the present invention is to prevent the sheet from shifting while improving the texture of the waist opening and its vicinity. [Means for solving the problem]

[0009] Representative aspects for solving the above problems are as follows. <First aspect> The garment comprises an annular waist region formed by joining both sides of a front body and both sides of a rear body, a middle region extending from the waist region of the front body through a crotch region to the waist region of the rear body, a waist opening provided on the side of the waist region opposite to the middle region, leg openings provided on both sides of the middle region in the width direction, an exterior body forming at least the waist region, and an interior body attached to the exterior body so as to extend from the front body to the rear body, The exterior body has a waist portion defined as an end portion on the waist opening side, the waist portion has an outer portion in which a first sheet made of nonwoven fabric and a second sheet made of nonwoven fabric are laminated, and an inner portion formed by folding the first sheet and the second sheet continuing from the outer portion inward at an edge of the waist opening, with at least one of the sheets extending over the entire waist portion; the inner portion is joined to the outer portion; The waist portion has a plurality of elongated waist elastic members provided between the outer portion and the inner portion along a width direction and spaced apart from one another, The first sheet and the second sheet have alternately arranged in a width direction a joining position that continues in a front-rear direction across the outer portion and the inner portion and a non-joint position that continues in a front-rear direction across the outer portion and the inner portion, the joining position has a joining portion where the first sheet and the second sheet are welded and joined, The outer portion of the waist portion has a first portion located on the waist opening side from a midpoint in a front-to-rear direction, and a second portion located on the opposite side, the waist portion has at least one waist elastic member at a position overlapping the first portion and at least one waist elastic member at a position overlapping the second portion, In the first portion and the second portion, a plurality of the joint portions are intermittently arranged in a front-rear direction with non-joint portions interposed therebetween, an area of ​​each joint in the first portion is smaller than an area of ​​each joint in the second portion; The distance between the joints in the first portion in the front-rear direction is equal to or greater than the distance between the joints in the second portion in the front-rear direction. A pants-type disposable wearing article.

[0010] (Action and effect) The outer body of the pants-type disposable wearing article is characterized in that the joints of the first and second sheets are intermittently provided in the first and second parts of the waist part, and the area and the front-to-back distance of each joint in the first part are different from the area and the front-to-back distance of each joint in the second part. That is, in the outer body of the pants-type disposable wearing article, the waist elastic member is covered with an outer part in which the first and second sheets are joined together, and in the first part of the outer part close to the edge of the waist opening, the area of ​​the joints is smaller and the front-to-back distance of the joints is the same or wider, so that the outer surface of the first part feels softer against the skin, while the first and second sheets are less likely to slip when the edge of the waist opening is formed by folding back the first and second sheets and when the product is worn. Furthermore, when the waist elastic member is covered by the portion having two layers, the first sheet and the second sheet, in the inner portion, the covered portion also feels soft to the touch of the inner surface (to the wearer). The "spacing in the front-rear direction" means the spacing in the front-rear direction between adjacent joints in the front-rear direction (the same applies below).

[0011] <Second aspect> In the inner portion, a plurality of the joint portions are intermittently arranged in the front-rear direction with non-joint portions interposed therebetween, an area of ​​each joint in the inner portion is smaller than an area of ​​each joint in the second portion; The distance between the joints in the inner portion in the front-to-rear direction is equal to or longer than the distance between the joints in the second portion in the front-to-rear direction. A pants-type disposable wearing article according to a first embodiment.

[0012] (Action and effect) By providing a joint in the inner portion within the same dimensional range as the first portion of the outer portion, the inner surface is soft to the touch, while the first and second sheets are less likely to shift when the first and second sheets are folded back to form the edge of the waist opening and when the product is worn.

[0013] <Third aspect> the overall width of all said joints is equal; A pants-type disposable wearing article according to the first or second aspect.

[0014] (Action and effect) The width of the joints may be changed in order to change the area of ​​the joints or the spacing in the front-to-rear direction, but it is preferable that all the joints have the same width, as this increases manufacturing stability.

[0015] <Fourth aspect> The bonding strength of all the bonding portions is equal. The pants-type disposable wearing article according to any one of the first to third aspects.

[0016] (Action and effect) As in the case of Patent Document 2, it is preferable to vary the bonding strength of the bonding parts depending on the location, but in order to improve production stability, it is better for the bonding strength of all bonding parts to be equal. The strength of the joint (joint strength) refers to the magnitude of the tensile force required to tear the joint per unit area or unit length.

[0017] <Fifth aspect> the first portion has an outer edge region that is 10 mm or less from an edge of the waist opening toward the leg opening, and the inner portion has an inner edge region that is 10 mm or less from an edge of the waist opening toward the leg opening, Among the joints located in the outer edge region and the inner edge region, one of the joints is a strong joint having a relatively high joint strength, and the other joints are weak joints having a relatively low joint strength, The joint portion located in a region of the first portion excluding the outer edge region and in a region of the inner portion excluding the inner edge region is the weak joint portion. The pants-type disposable wearing article according to any one of the first to fourth aspects.

[0018] (Action and effect) The exterior body of this pants-type disposable wearing article is characterized by varying the strength of the joint between the first and second sheets (the weaker the joint strength by welding of the nonwoven fabric, the more the fibers are prevented from melting and the fabric becomes softer), and by devising an arrangement thereof. That is, at the joint positions across the outer edge region and the inner edge region, a strong joint is arranged in one place, and therefore the first and second sheets are firmly integrated near the folding position, which makes it easy to fold the first and second sheets when folding them to form the edge of the waist opening, and also makes it difficult for the first and second sheets to shift at the edge of the waist opening and in its vicinity during this process and when the product is worn.

[0019] <Sixth aspect> The exterior body of the torso portion has a waist lower portion continuing to the leg opening side of the waist portion, the lower waist portion includes the first sheet and the second sheet continuing from the outer portion, and a plurality of elongated lower waist elastic members provided between the first sheet and the second sheet along the width direction and spaced apart from each other, the joining position and the non-jointing position are continuous from the waist portion to the lower waist portion, At the joining position in the waist lower portion, the strong joining portions are adjacently disposed on both sides of the waist lower elastic member in the front-rear direction, and weak joining portions are disposed between adjacent strong joining portions between adjacent waist lower elastic members, the size and spacing of the strong joints at the joining position of the second portion are equal to the size and spacing of the strong joints located closest to the waist opening at the joining position of the waist lower portion; A pants-type disposable wearing article according to a fifth aspect.

[0020] (Action and effect) It is preferable that the arrangement of the strong and weak joints in the lower waist part is similar to that described in Patent Document 2, but if the arrangement of the strong joints changes at the boundary between the lower waist part and the waist part, the texture will change suddenly, which may make the boundary more susceptible to horizontal wrinkles or cause an uncomfortable feeling. Therefore, as in this embodiment, it is preferable to provide a strong joint in the second part and make its dimensions and arrangement the same as those of the strong joint located closest to the waist opening in the lower waist part.

[0021] <Seventh aspect> The area of ​​each joint in the first portion is 0.1 to 15 mm 2 and The area of ​​each joint of the second portion is No. 1.1 to 3.0 times the area of ​​each joint of one part, The distance between the joints in the first portion in the front-rear direction is 2.0 to 15 mm; A distance between the joints in the second portion in the front-rear direction is 0.3 to 1.0 times a distance between the joints in the first portion in the front-rear direction. The pants-type disposable wearing article according to any one of the first to sixth aspects.

[0022] (Action and effect) The dimensions of the joints can be determined as appropriate, but are preferably within the range of this embodiment. <Eighth aspect> The garment comprises an annular waist region formed by joining both sides of a front body and both sides of a rear body, a middle region extending from the waist region of the front body through a crotch region to the waist region of the rear body, a waist opening provided on the side of the waist region opposite to the middle region, leg openings provided on both sides of the middle region in the width direction, an exterior body forming at least the waist region, and an interior body attached to the exterior body so as to extend from the front body to the rear body, The exterior body has a waist portion defined as an end portion on the waist opening side, the waist portion has an outer portion in which a first sheet made of nonwoven fabric and a second sheet made of nonwoven fabric are laminated, and an inner portion formed by folding the first sheet and the second sheet continuing from the outer portion inwardly at an edge of the waist opening and extending over the entire waist portion, the inner portion is joined to the outer portion; the waist portion has a plurality of elongated waist elastic members provided at intervals between the first sheet and the second sheet in the inner portion along the width direction, The first sheet and the second sheet have alternately arranged in a width direction a joining position that continues in a front-rear direction across the outer portion and the inner portion and a non-joint position that continues in a front-rear direction across the outer portion and the inner portion, At the joining position, the first sheet and the second sheet have a joining portion which is welded and joined via the waist elastic member at a portion having the waist elastic member therebetween and directly at a portion not having the waist elastic member, The outer portion of the waist portion has a first portion located on the waist opening side from a midpoint in a front-to-rear direction, and a second portion located on the opposite side, the inner portion has at least one waist elastic member at a position overlapping the first portion and at least one waist elastic member at a position overlapping the second portion, In the first portion and the second portion, a plurality of the joint portions are intermittently arranged in a front-rear direction with non-joint portions interposed therebetween, an area of ​​each joint in the first portion is smaller than an area of ​​each joint in the second portion; A distance between the joints in the first portion in the front-rear direction is equal to or longer than a distance between the joints in the second portion in the front-rear direction; A pants-type disposable wearing article.

[0023] (Action and effect) The exterior body of the pants-type disposable wearing article is characterized in that the first and second sheets are joined intermittently in a first and second portion of the waist portion, and the area and spacing of each joined portion in the first portion are different from the area and spacing of each joined portion in the second portion. That is, the area of ​​the joined portion is larger in the first portion near the edge of the waist opening, and the spacing between the joined portions is the same or wider. This makes the outer surface of the first portion soft to the touch, while preventing the first and second sheets from shifting easily when the first and second sheets are folded back to form the edge of the waist opening and when the product is worn. Effect of the Invention

[0024] As described above, the present invention provides advantages such as preventing the sheet from shifting while improving the texture of the waist opening and its vicinity. [Brief description of the drawings]

[0025] [Figure 1] FIG. 2 is a plan view showing the inner surface of the pants-type disposable diaper in an unfolded state. [Diagram 2] FIG. 2 is a plan view showing the outer surface of the pants-type disposable diaper in an unfolded state. [Diagram 3] 2 is a cross-sectional view of FIG. 1 along line 2-2. [Figure 4] 3 is a cross-sectional view of FIG. 1 along line 3-3. [Diagram 5] 1(a) is a cross-sectional view taken along line 4-4 in FIG. 1, and FIG. [Figure 6] FIG. 1 is a perspective view of a pants-type disposable diaper. [Figure 7] FIG. 2 is a plan view showing the outer surface of the inner body in the deployed state together with the contour of the outer body. [Figure 8] 1 is a cross-sectional view of an exterior body at a joining position, the cross-sectional view showing joined and unjoined portions in an exaggerated manner. [Figure 9] 9A is a plan view of the outer portion of the example in FIG. 8, and FIG. 9B is a plan view of the inner portion of the example in FIG. [Figure 10]1 is a cross-sectional view of an exterior body at a joining position, the cross-sectional view showing joined and unjoined portions in an exaggerated manner. [Figure 11] 11A is a plan view of the outer portion of the example in FIG. 10, and FIG. 11B is a plan view of the inner portion of the example in FIG. [Figure 12] 1 is a cross-sectional view of an exterior body at a joining position, the strong joint portion, the weak joint portion, and the non-joint portion being exaggerated and generally shown. [Figure 13] 13A is a plan view of the outer portion of the example in FIG. 12, and FIG. 13B is a plan view of the inner portion of the example in FIG. [Figure 14] 1 is a cross-sectional view of an exterior body at a joining position, the strong joint portion, the weak joint portion, and the non-joint portion being exaggerated and generally shown. [Figure 15] 15A is a plan view of the outer portion of the example in FIG. 14, and FIG. 15B is a plan view of the inner portion of the example in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] A pants-type disposable diaper will be described below in detail as an example of a pants-type disposable wearing article with reference to the attached drawings. Each component member adjacent in the thickness direction is fixed or joined as necessary in the same manner as known diapers, except for the fixed or joined parts described below. The dotted parts in the cross-sectional view indicate an adhesive such as a hot melt adhesive as the fixing or joining means. The hot melt adhesive can be applied by known methods such as slot application, continuous line or dotted line bead application, spiral, Z-shaped, wavy, etc. spray application, or pattern coating (transfer of hot melt adhesive by letterpress printing). Alternatively or in addition to this, at the fixing part of the elastic member, the hot melt adhesive can be applied to the outer circumferential surface of the elastic member to fix the elastic member to the adjacent member. Examples of hot melt adhesives include EVA-based, adhesive rubber-based (elastomer-based), PolyThere are types such as olefin-based, polyester-polyamide-based, etc., but they can be used without any particular limitation. As a fixing or joining means for joining each component, a material welding means such as heat sealing or ultrasonic sealing can be used. In a portion where liquid permeability in the thickness direction is required, adjacent components in the thickness direction are fixed or joined in an intermittent pattern. For example, when such intermittent fixing or joining is performed with a hot melt adhesive, intermittent pattern coating such as a spiral, Z-shaped, or wavy pattern can be suitably used, and when coating an area larger than the coating width of one nozzle, intermittent pattern coating such as a spiral, Z-shaped, or wavy pattern can be performed with or without a gap in the width direction. As a joining means for joining each component, a material welding means such as heat sealing or ultrasonic sealing can be used.

[0027] In the following description, a known nonwoven fabric may be used as appropriate depending on the part and purpose. The fibers constituting the nonwoven fabric may be, for example, polyethylene or polypropylene. Poly In addition to synthetic fibers such as olefin, polyester, and polyamide (including single-component fibers and composite fibers such as core-sheath fibers), regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be selected without particular limitation, and these can also be used in combination. In order to increase the flexibility of the nonwoven fabric, it is preferable that the constituent fibers are crimped fibers. In addition, the constituent fibers of the nonwoven fabric may be hydrophilic fibers (including fibers that have been made hydrophilic by a hydrophilizing agent), hydrophobic fibers, or water-repellent fibers (including fibers that have been made water-repellent by a water-repellent agent). Furthermore, nonwoven fabrics are generally classified into staple fiber nonwoven fabrics, long fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (air-through) nonwoven fabrics, needle punched nonwoven fabrics, point bond nonwoven fabrics, laminated nonwoven fabrics (SMS nonwoven fabrics with a meltblown layer sandwiched between spunbond layers, SMMS nonwoven fabrics, etc.) depending on the fiber length, sheet formation method, fiber bonding method, and laminated structure, and any of these nonwoven fabrics can be used.

[0028] 1 to 6 show a pants-type disposable diaper. This pants-type disposable diaper includes a rectangular front exterior body 12F constituting at least the waist circumference of the front body F, a rectangular rear exterior body 12B constituting at least the waist circumference of the rear body B, and an inner body 200 provided inside the exterior bodies 12F, 12B so as to extend from the front exterior body 12F through the crotch area to the rear exterior body 12B. Both sides of the front exterior body 12F and both sides of the rear exterior body 12B are joined to form side seals 12A, and an opening formed by the front and rear ends of the exterior bodies 12F, 12B becomes a waist opening WO through which the wearer's torso passes, and the parts on both sides of the inner body 200 in the width direction that are surrounded by the lower edges of the exterior bodies 12F, 12B and the side edges of the inner body 200 become leg openings LO through which the legs pass. The inner body 200 is a portion that absorbs and retains excrement such as urine, and the outer bodies 12F, 12B are portions that support the inner body 200 against the wearer's body. Furthermore, the symbol Y indicates the overall length of the diaper in the unfolded state (the length in the front-to-rear direction from the edge We of the waist opening WO of the front body F to the edge We of the waist opening WO of the back body B), and the symbol X indicates the overall width of the diaper in the unfolded state.

[0029] This pants-type disposable diaper has an annular waist region T formed by joining both sides of a front body F and both sides of a rear body B with side seals 12A, a middle region L extending from the waist region T of the front body F through the crotch region to the waist region T of the rear body B, a waist opening WO provided on the opposite side of the middle region L in the waist region T, and leg openings LO provided on both sides of the middle region L in the width direction WD. In other words, the waist region T is defined as the range in the front-rear direction LD from the waist opening WO to the upper end of the leg openings LO, and the middle region L is defined as the range in the front-rear direction LD between the lower end of the side seals 12A of the front body F and the lower end of the side seals 12A of the rear body B. In the developed state shown in Figs. 1 and 2, both side edges of the middle region L are constricted in a U-shape or curved shape to fit the wearer's legs, and the overall shape of the diaper is approximately hourglass-shaped.

[0030] The pants-type disposable diaper also comprises two main assemblies, namely, outer bodies 12F, 12B forming at least the waist region T, and an inner body 200 attached to the outer bodies 12F, 12B so as to extend from the front body F to the rear body B.

[0031] (Interior body) In the illustrated example, the inner body 200 is rectangular, but may have any shape. As shown in Figs. 3 to 5, the inner body 200 is provided with a top sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween, and is a main body portion that performs an absorbing function. Reference numeral 40 denotes an intermediate sheet provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer liquid that has permeated the top sheet 30 to the absorbent element 50, and reference numeral 60 denotes rising gathers 60 that extend from both sides of the inner body 200 so as to contact the wearer's legs in order to prevent excrement from leaking out to both sides of the inner body 200.

[0032] (Top sheet) The top sheet 30 is liquid-permeable, and examples of such materials include a perforated or non-perforated nonwoven fabric and a perforated plastic sheet. The top sheet 30 may consist of a single sheet, or may consist of a laminated sheet obtained by bonding two or more sheets together. Similarly, the top sheet 30 may consist of a single sheet, or may consist of two or more sheets in the planar direction.

[0033] Both side portions of the top sheet 30 may be folded back at the side edges of the absorbent element 50, or may not be folded back and may extend beyond the side edges of the absorbent element 50.

[0034] The top sheet 30 is desirably fixed to an adjacent member on the back side by a joining means that uses material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive, in order to prevent the top sheet 30 from shifting relative to the member on the back side, etc. In the illustrated example, the top sheet 30 is fixed to the front surface of the intermediate sheet 40 and the surface of the portion of the packaging sheet 58 that is located on the front side of the absorbent body 56 by a hot melt adhesive applied to the back surface of the top sheet 30.

[0035] (middle seat) In order to allow liquid that has permeated the top sheet 30 to quickly transfer to the absorbent body 56, an intermediate sheet (also called a "second sheet") 40, which has a faster liquid permeability rate than the top sheet 30, can be provided. This intermediate sheet 40 is intended to quickly transfer liquid to the absorbent body 56, improve the absorption performance of the absorbent body 56, and prevent the "backflow" phenomenon of absorbed liquid from the absorbent body 56. The intermediate sheet 40 can also be omitted.

[0036] Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, point-bond nonwoven fabric, and crepe paper. Air-through nonwoven fabric is particularly preferred because of its bulkiness. For the air-through nonwoven fabric, it is preferable to use composite fibers with a core-sheath structure, and in this case, the resin used for the core may be polypropylene (PP), but is preferably polyester (PET) with high rigidity. The basis weight is 17 to 80 g / m 2 is preferable, and 17 to 50 g / m 2 The thickness of the raw fiber of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use eccentric fibers, hollow fibers, or eccentric and hollow fibers as all or part of the raw fiber mixture in order to make the nonwoven fabric bulky.

[0037] In the illustrated example, the intermediate sheet 40 is positioned in the center and is shorter than the width of the absorbent body 56, but it may be provided across the entire width. The length of the intermediate sheet 40 in the front-rear direction LD may be the same as the entire length of the diaper, the same as the length of the absorbent element 50, or may be within a short length range centered on the liquid receiving region.

[0038] The intermediate sheet 40 is desirably fixed to the adjacent member on the rear side by a joining means such as heat sealing or ultrasonic sealing that uses material welding, or by a hot melt adhesive, in order to prevent the intermediate sheet 40 from being misaligned with respect to the member on the rear side. In the illustrated example, the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 that is located on the front side of the absorbent body 56 by a hot melt adhesive applied to the rear side.

[0039] (Liquid-impermeable sheet) The material of the liquid-impermeable sheet 11 is not particularly limited, but may be, for example, polyethylene, polypropylene, etc. Poly Examples of the material include a plastic film made of an olefin resin, a laminated nonwoven fabric in which a plastic film is provided on the surface of a nonwoven fabric, and a laminated sheet in which a nonwoven fabric is laminated and bonded to a plastic film. The liquid-impermeable sheet 11 is preferably made of a material that is liquid-impermeable and moisture-permeable, which is preferred from the viewpoint of preventing stuffiness. Examples of the moisture-permeable plastic film include polyethylene, polypropylene, etc. Poly Microporous plastic films obtained by kneading inorganic fillers into olefin resins, forming the sheets, and then stretching them in uniaxial or biaxial directions are widely used. In addition, sheets that have been made liquid-impermeable without using plastic films by methods such as nonwoven fabrics using microdenier fibers, strengthening leak-proofness by reducing the voids in the fibers by applying heat or pressure, and coating with highly water-absorbent resins or hydrophobic resins or water-repellent agents can also be used as the liquid-impermeable sheet 11, but it is preferable to use a resin film in order to obtain sufficient adhesive strength when bonding with the cover nonwoven fabric 13 described later via a hot melt adhesive.

[0040] The liquid-impermeable sheet 11 is made to have a width that fits on the back side of the absorbent element 50 as shown in the figure, and in order to improve leakproofness, it can also be made to wrap around both sides of the absorbent element 50 and extend to both side portions of the absorbent element 50 on the side of the top sheet 30. The appropriate width of this extension is about 5 to 20 mm on each side.

[0041] (Rising Gathers) The rising gathers 60 extend along both sides of the inner body 200 over the entire length in the front-rear direction LD, and are provided to come into contact with the legs of the wearer to prevent side leakage. If necessary, the rising gathers 60 can be omitted.

[0042] 1, 3, and 4 show rising gathers 60 (so-called three-dimensional gathers) that rise from the side of the inner body 200 to the front side. These rising gathers 60 have a base side portion 60B that rises obliquely toward the widthwise center, and a tip side portion 60A that rises obliquely from the intermediate portion toward the widthwise outer side, but are not limited to this and can be appropriately modified, such as a form in which the gathers as a whole rise toward the widthwise center.

[0043] More specifically, the rising gathers 60 in the illustrated example are formed by folding back a strip-shaped gathered nonwoven fabric 62 having a length equal to the front-rear length of the inner body 200 in the width direction WD at its tip portion and folding it in two, and fixing a plurality of elongated gathered elastic members 63 at intervals in the width direction WD between the folded-back portion and the sheet in the vicinity thereof in a stretched state along the longitudinal direction. The base end portion of the rising gathers 60 located opposite the tip portion (the end portion opposite the folded-back portion of the sheet in the width direction WD) is a root portion 65 fixed to the side portion on the back side of the liquid-impermeable sheet 11 in the inner body 200, and the portion other than this root portion 65 is a main portion 66 (portion on the folded-back portion side) extending from the root portion 65. The main body portion 66 has a root side portion 60B extending toward the center in the width direction, and a tip side portion 60A that is folded back at the tip of the root side portion 60B and extends outward in the width direction. This form is a surface contact type of risen gather 60, but a line contact type of risen gather 60 that is not folded back outward in the width direction can also be used. The front-to-rear direction both end portions of the main body portion 66 are laid down portions 67 that are fixed to the side surfaces of the top sheet 30 in a laid down state, while the front-to-rear direction intermediate portion located between them is an unfixed free portion 68, and a gather elastic member 63 extending along the front-to-rear direction LD is fixed in a stretched state to at least the tip portion of this free portion 68.

[0044] In the rising gathers 60 configured as described above, the contractile force of the gather elastic member 63 acts to bring the front-rear end portions closer together, but while the front-rear end portions of the main body portion 66 are fixed so as not to stand up, the portion between them is an unfixed free portion 68, so that only the free portion 68 stands up to abut against the body side as shown by the arrow in Fig. 3. In particular, when the root portion 65 is located on the back side of the inner body 200, the free portion 68 stands up to open outward in the width direction in the crotch area and its vicinity, so that the rising gathers 60 come into surface contact with the leg circumference, improving the fit.

[0045] In the illustrated example of the raised gathers 60, in a bent form in which the main body portion 66 is made up of a root portion 60B extending toward the center in the width direction and a tip portion 60A folded back at the tip of the root portion 60B and extending outward in the width direction, the tip portion 60A and the root portion 60B are joined in a fallen state at the fallen portion 67, and the root portion 60B is joined in a fallen state to the top sheet 30. At least one of various application methods of hot melt adhesives and material welding means such as heat sealing and ultrasonic sealing can be used to join the opposing surfaces at the fallen portion 67. In this case, the joining of the root portion 60B and the top sheet 30 and the joining of the tip portion 60A and the root portion 60B may be performed by the same means or by different means. For example, in one preferred embodiment, the base portion 60B and the top sheet 30 are joined by a hot melt adhesive, and the tip portion 60A and the base portion 60B are joined by material welding.

[0046] The gathered nonwoven fabric 62 may be a spunbond nonwoven fabric (SS, SSS, etc.), a SMS nonwoven fabric (SMS, SSMMS, etc.), a meltblown hmm A nonwoven fabric that is soft and has excellent uniformity and hiding power, and that has been treated with a water-repellent agent such as silicone as necessary, can be preferably used. The fiber weight is 10 to 30 g / m. 2 It is preferable that the thickness is about 470 to 1240 dtex, and more preferably 620 to 940 dtex. The elongation rate at the time of fixing is preferably 150 to 350%, and more preferably 200 to 300%. As shown in the figure, a waterproof film 64 can be interposed between the gathered nonwoven fabric 62 folded in two. In this case, the gathered nonwoven fabric 62 can be partially omitted where the waterproof film 64 is present. However, in order to make the product look and feel like cloth, it is necessary that at least the outer surface of the rising gathers 60 from the base end to the tip end is formed of the gathered nonwoven fabric 62, as in the example shown in the figure.

[0047] The number of gather elastic members 63 provided in the free portion 68 of the rising gathers 60 is preferably 2 to 6, and more preferably 3 to 5. The appropriate spacing is 3 to 10 mm. With this configuration, the gather elastic members 63 can easily come into contact with the skin in the range in which they are arranged. The gather elastic members 63 may be arranged not only on the tip side but also on the base side.

[0048] In the free portion 68 of the rising gather 60, at least one of hot melt adhesives applied by various application methods and material welding fixing means such as heat sealing and ultrasonic sealing can be used to bond the inner layer and the outer layer of the gathered nonwoven fabric 62 together and to fix the gathered elastic member 63 sandwiched therebetween. If the entire surfaces of the inner layer and the outer layer of the gathered nonwoven fabric 62 are bonded together, flexibility is lost, so it is preferable that the parts other than the bonding parts of the gathered elastic member 63 are not bonded or are weakly bonded. In the illustrated example, a hot melt adhesive is applied only to the outer peripheral surface of the gathered elastic member 63 by an application means such as a comb gun or a surwrap nozzle, and the gathered elastic member 63 is sandwiched between the inner layer and the outer layer of the gathered nonwoven fabric 62, so that the gathered elastic member 63 is fixed to the inner layer and the outer layer of the gathered nonwoven fabric 62 and the inner layer and the outer layer of the gathered nonwoven fabric 62 are fixed only by the hot melt adhesive applied to the outer peripheral surface of the gathered elastic member 63.

[0049] Similarly, the waterproof film 64 incorporated in the rising gathers 60 can be fixed to the gathered nonwoven fabric 62, and the fallen portion 67 can be fixed using at least one of hot melt adhesives applied by various application methods and material welding means such as heat sealing or ultrasonic sealing.

[0050] (Absorption element) The absorbent element 50 has an absorbent body 56 and a wrapping sheet 58 that wraps the entire absorbent body 56. The wrapping sheet 58 may be omitted.

[0051] (Absorbent) The absorbent body 56 can be formed by a fiber assembly. As the fiber assembly, in addition to stacked staple fibers such as cotton-like pulp or synthetic fibers, a filament assembly obtained by opening a tow (fiber bundle) of synthetic fibers such as cellulose acetate as required can be used. When stacking cotton-like pulp or staple fibers, the fiber weight is, for example, 100 to 300 g / m 2 In the case of a filament aggregate, for example, the weight is 30 to 120 g / m 2 The fineness of the synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament aggregate, the filaments may be non-crimped fibers, but are preferably crimped fibers. The degree of crimp of the crimped fibers can be, for example, about 5 to 75, preferably 10 to 50, and more preferably 15 to 50, per 2.54 cm. Uniformly crimped fibers can be used. It is preferable to disperse and hold high-absorbent polymer particles in the absorbent body 56.

[0052] The absorbent body 56 may be rectangular in shape, but as shown in Figure 7, it is preferable for the absorbent body 56 to have an hourglass shape with a narrower constricted portion 56N in the middle in the front-to-rear direction than both the front and rear ends, as this improves the fit of the absorbent body 56 itself and the rising gathers 60 around the legs.

[0053] The dimensions of the absorber 56 can be determined as appropriate as long as it extends from the front to the back and the left to the right of the urination opening position, but it is preferable that it extends to the peripheral edge of the inner body 200 or its vicinity in the front-back direction LD and the width direction WD.

[0054] (Superabsorbent polymer particles) The absorbent body 56 may contain superabsorbent polymer particles in part or in its entirety. Superabsorbent polymer particles include not only "particles" but also "powder". As the superabsorbent polymer particles, those used in this type of disposable diaper can be used as they are. For example, it is desirable that the proportion of particles remaining on a 500 μm standard sieve (JIS Z8801-1:2006) when sieved (shaking for 5 minutes) is 30% by weight or less, and it is also desirable that the proportion of particles remaining on a 180 μm standard sieve (JIS Z8801-1:2006) when sieved (shaking for 5 minutes) is 60% by weight or more.

[0055] The material of the superabsorbent polymer particles is not particularly limited, but preferably has a water absorption of 40 g / g or more. The superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based materials, and may be starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, crosslinked products of sodium carboxymethylcellulose, and acrylic acid (salt) polymers. The shape of the superabsorbent polymer particles is preferably a powder-like shape that is commonly used, but other shapes may also be used.

[0056] The highly absorbent polymer particles preferably have a water absorption speed of, for example, 70 seconds or less, particularly 40 seconds or less. If the water absorption speed is too slow, the liquid supplied into the absorbent body 56 tends to flow back out of the absorbent body 56, which is known as backflow.

[0057] Moreover, the highly absorbent polymer particles preferably have a gel strength of, for example, 1000 Pa or more. This makes it possible to effectively suppress a sticky feeling after absorbing liquid, even when the absorbent body 56 is bulky.

[0058] The basis weight of the highly absorbent polymer particles can be appropriately determined according to the absorption amount required for the application of the absorbent body 56. Therefore, although it cannot be generally stated, it is generally in the range of 50 to 350 g / m 2 It can be said that:

[0059] (packaging sheet) When the wrapping sheet 58 is used, the material that can be used is tissue paper, particularly crepe paper, nonwoven fabric, polylaminated nonwoven fabric, a sheet with small holes, etc. However, it is preferable that the sheet does not allow the superabsorbent polymer particles to escape. When using nonwoven fabric instead of crepe paper, hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material that can be used is polypropylene, polyethylene / polypropylene composite, etc. The basis weight is 5 to 40 g / m 2 , especially 10 to 30 g / m 2 It is preferable that the following be used.

[0060] The packaging form of the packaging sheet 58 can be determined as appropriate, but from the standpoint of ease of manufacture and preventing leakage of superabsorbent polymer particles from the front and rear edges, it is preferable to wrap it around the front, back, and both side surfaces of the absorbent 56 in a cylindrical shape, with the front and rear edges extending beyond the front and rear of the absorbent 56, and to join the overlapping parts of the wrap and the overlapping parts of the protruding front and rear edges by a joining means such as a hot melt adhesive or material welding.

[0061] (Exterior body) The exterior bodies 12F, 12B in the illustrated example are composed of a rectangular front exterior body 12F forming the waist region T of the front body F and a rectangular back exterior body 12B forming the waist region T of the back body B, and the front exterior body 12F and the back exterior body 12B are not continuous on the crotch side, but are separated in the front-to-back direction LD. This separation distance 12d can be, for example, about 150 to 250 mm. The exterior bodies 12F, 12B may be an integrated body that is continuous from the front body F to the back body B through the crotch area.

[0062] The portion of the exterior body 12F, 12B located in the waist region T can be divided into a waist portion W forming the end portion on the waist opening WO side and a lower waist portion U which is the portion below the waist portion W. If the portion of the exterior body 12F, 12B located in the waist region T has a boundary where the stretching force in the width direction WD changes (for example, the thickness or elongation rate of the elastic member changes), the waist portion W is the portion closer to the waist opening WO than the boundary located closest to the waist opening WO side, and if there is no such boundary, the waist extension portion 12E extending further toward the waist opening WO side than the absorber 56 or the interior body 200 is the waist portion W. The length of these in the front-rear direction LD varies depending on the size of the product and can be determined appropriately, but as an example, the waist portion W can be 15 to 40 mm and the lower waist portion U can be 65 to 120 mm.

[0063] In the illustrated example, the front exterior body 12F and the rear exterior body 12B have the same dimension in the front-to-rear direction LD and neither has a portion located in the middle region L, but as shown by the two-dot chain line in Fig. 7, the rear exterior body 12B has a longer dimension in the front-to-rear direction than the front exterior body 12F, and the front exterior body 12F does not have a portion located in the middle region L, but the rear exterior body 12B may have a buttocks covering portion C extending from the waist region T toward the middle region L. Although not shown, the front exterior body 12F may also be provided with a groin covering portion extending from the waist region T toward the middle region L, or a configuration may be used in which a groin covering portion is provided but no buttocks covering portion is provided.

[0064] The exterior bodies 12F, 12B incorporate elastic members 15, 17 to improve the fit around the waist of the wearer, and form an elastic region A2 that elastically stretches in the width direction WD with the elastic members 15, 17. In the elastic region A2, the exterior bodies 12F, 12B contract with the contraction of the elastic members in the natural length state, forming wrinkles or folds, and when stretched in the longitudinal direction of the elastic members, can be stretched to a predetermined stretch rate without wrinkles. The elastic members 15, 17 can be any known elongated elastic member such as a thread or strip, without any particular limitation. The elastic members 15, 17 may be made of synthetic rubber or natural rubber.

[0065] To explain the elastic members 15, 17 in the illustrated example in more detail, a plurality of waist elastic members 17 are attached to the waist portion W of the outer bodies 12F, 12B at intervals in the front-rear direction so as to be continuous over the entire width direction WD. Of the waist elastic members 17, one or more arranged in the region adjacent to the waist lower portion U may overlap the inner body 200, or may be provided on both sides in the width direction except for the width direction central portion overlapping with the inner body 200. The waist elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber; in the case of natural rubber, a cross-sectional area of ​​0.05 to 1.5 mm2). 2 , especially 0.1 to 1.0 mm 2 It is preferable to provide about 2 to 15, and especially about 4 to 10, rubber threads (approximately 17 mm long) at intervals of 2 to 12 mm, especially 3 to 7 mm, so that the elongation rate in the width direction WD of the waist portion W is preferably about 150 to 400%, especially 220 to 320%. The intervals between the waist elastic members 17 in the front-to-back direction LD may be constant or may vary midway in the front-to-back direction LD.

[0066] It is also preferable that a plurality of waist lower elastic members 15 made of elongated elastic members are attached to the waist lower portion U of the exterior bodies 12F, 12B at intervals in the front-rear direction. The waist lower elastic members 15 should have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber; in the case of natural rubber, a cross-sectional area of ​​0.05 to 1.5 mm 2 , especially 0.1 to 1.0 mm 2 It is preferable to provide about 5 to 30 rubber threads (approximately 15 mm long) at intervals of 1 to 15 mm, especially 3 to 8 mm, so that the elongation rate in the width direction WD of the waist lower portion U is about 200 to 350%, especially 240 to 300%. The intervals between the waist lower elastic members 15 in the front-to-back direction LD may be constant or may vary midway in the front-to-back direction LD as in the illustrated example.

[0067] When the waist lower elastic member 15 is provided in the front-rear range having the absorbent body 56 as in the illustrated example of the waist lower part U, in order to prevent contraction of the absorbent body 56 in the width direction WD in part or all of it, the widthwise middle including part or all of the part overlapping with the absorbent body 56 in the width direction WD (preferably including the entire interior joint parts 201, 202) is made into a non-elastic region A1, and both sides in the width direction are made into elastic regions A2. It is preferable that the waist part W is made into an elastic region A2 over the entire width direction WD, but like the waist lower part U, a non-elastic region A1 may be provided in the widthwise middle.

[0068] Such stretchable region A2 and non-stretchable region A1 can be constructed in the manufacture of exterior bodies 12F, 12B by fixing elastic member 15 and then cutting waist-under elastic member 15 in the region that will become non-stretchable region A1 at one location in the middle of the width direction by applying pressure and heat or by cutting it finely at multiple locations, so that stretchability is retained in stretchable region A2 while eliminating stretchability in non-stretchable region A1. In these cases, cut pieces 16 of the elastic member that do not substantially contribute to stretching will remain in exterior bodies 12F, 12B in non-stretchable region A1.

[0069] (Laminated structure of exterior body) 8 and 9, the waist portion W has an outer portion 18 in which a first sheet 12S made of nonwoven fabric and a second sheet 12H made of nonwoven fabric are laminated, and an inner portion 19 formed by folding the first sheet 12S and the second sheet 12H continuing from the outer portion 18 inward at the edge We of the waist opening WO, and the first sheet 12S extends over the entire waist portion W, and the inner portion 19 is joined to the outer portion 18 via a hot melt adhesive HM (or by welding). In the illustrated example, the first sheet 12S and the second sheet 12H of the outer portion 18 extend from the waist portion W to the lower waist portion U (over the entire torso region T in the illustrated example), but this is not limited thereto, and appropriate modifications are possible, such as forming the lower waist portion U with a different sheet. In addition, in the illustrated example, the second sheet 12H of the inner portion 19 extends only to the middle of the waist portion W in the front-to-back direction LD, and the first sheet 12S extends from the waist portion W to the lower waist portion U and covers the end of the inner body 200 on the waist opening WO side, but this is not limited to this, and for example, both the first sheet 12S and the second sheet 12H may extend to the lower waist portion U, or both the first sheet 12S and the second sheet 12H may be contained within the waist portion W, or they may extend only as far as the waist opening WO side of the inner body 200 and not cover the end of the inner body 200.

[0070] The material of the first sheet 12S and the second sheet 12H can be appropriately determined as long as it is a nonwoven fabric. For example, the first sheet 12S and the second sheet 12H can be made of polyethylene, polypropylene, etc. Poly Nonwoven fabrics made of synthetic fibers such as olefin, polyester, polyamide, etc., or mixed fibers or composite fibers using two or more of these can be used. Examples of fiber bonding methods include the air-through method and the point bond method. The fineness, basis weight, and thickness of the nonwoven fabrics used for the first sheet 12S and the second sheet 12H can be appropriately determined. As an example, the nonwoven fabrics used for the first sheet 12S and the second sheet 12H have a fineness of 1.0 to 2.5 dtex and a basis weight of 10 to 30 g / m, respectively. 2In particular, it is preferable that the nonwoven fabric be a long fiber fabric having a thickness of 0.15 to 0.50 mm.

[0071] 8 and 9, waist elastic member 17 provided in waist portion W is provided between outer portion 18 and inner portion 19. In the illustrated example, waist elastic member 17 is fixed to second sheet 12H of outer portion 18 and inner portion 19 by hot melt adhesive HM applied to its outer peripheral surface, but it may be fixed by welding. When waist portion W is at its natural length, it shrinks in width direction WD together with waist elastic member 17 and wrinkles are formed, but when it is stretched in width direction WD together with waist elastic member 17 in the worn state, the wrinkles spread out and become completely wrinkle-free when unfolded.

[0072] The waist lower elastic member 15 provided in the waist lower portion U is provided between the first sheet 12S and the second sheet 12H continuing from the outer portion 18, but is not limited thereto and may be provided between other sheets. In the illustrated example, the waist lower elastic member 15 is fixed to the first sheet 12S and the second sheet 12H by welding at a joining position 90 described later, but is not limited thereto and may be provided between any other sheets. 15 The first sheet 12S and the second sheet 12H may be fixed to each other by a hot melt adhesive HM applied to the outer peripheral surface of the first sheet 12S and the second sheet 12H. When the waist lower portion U is at its natural length, it shrinks in the width direction WD together with the waist lower elastic member 15, forming wrinkles, but when the waist lower portion U is stretched to some extent in the width direction WD together with the waist lower elastic member 15 in the worn state, the wrinkles spread out, and when the waist lower portion U is unfolded, the wrinkles disappear completely.

[0073] The first sheet 12S and the second sheet 12H are provided with alternately and repeatedly in the width direction WD, joint positions 90 continuing in the front-to-back direction LD across the outer portion 18 and the inner portion 19, and non-joint positions 91 continuing in the front-to-back direction LD across the outer portion 18 and the inner portion 19, and each joint position 90 has a joint portion 80 where the first sheet 12S and the second sheet 12H are welded and joined. In the illustrated example, the joint positions 90 and non-joint positions 91 having this joint portion 80 continue not only to the waist portion W but also to the lower waist portion U. Here, the state where the first sheet 12S and the second sheet 12H are welded and joined includes not only a state where almost all the fibers of the first sheet 12S and the second sheet 12H are melted and integrated (for example, less than 10 fibers may protrude) and a film-like state (higher transparency than the surroundings), but also a state where almost all the fibers of the layers on the joining surface side of both the first sheet 12S and the second sheet 12H are welded and the fibers of the layers on the opposite surface side are not welded and remain independent, or a state where only some of the fibers located on at least one of the joining surfaces of the first sheet 12S and the second sheet 12H are welded. It is preferable that the opposing surfaces of the first sheet 12S and the second sheet 12H are not bonded over their entirety with the hot melt adhesive HM, but they may be partially bonded as necessary, for example, at both ends of the waist lower elastic member 15. The joining position 90 may be a straight line along the front-rear direction LD as shown in the figure, an oblique straight line inclined at 0 to 30 degrees to the front-rear direction LD, or a wavy line. The width of the joining position 90 (width of the joining parts 81, 82) and the interval in the width direction WD (width of the non-joining position 91) may be appropriately determined, but for example, the width of the joining position 90 may be about 0.1 to 5 mm, particularly about 0.5 to 3 mm, and the interval in the width direction WD may be about 3 to 10 mm, particularly about 3 to 5 mm. As a processing method for welding and joining, in addition to ultrasonic sealing, heat sealing by heating a roll may be used.

[0074] The outer portion 18 has a first portion P1 located on the waist opening WO side from the middle in the front-to-rear direction LD, and a second portion P2 located on the opposite side, and the waist portion W has at least one waist elastic member 17 at a position overlapping with the first portion P1 and the second portion P2. Characteristically, the first portion P1 and the second portion P2 each have a plurality of joints 80 intermittently arranged in the front-to-rear direction LD with non-jointed portions 83 interposed therebetween, the area of ​​each joint 80 in the first portion P1 being smaller than the area of ​​each joint 80 in the second portion P2, and the spacing k1 in the front-to-rear direction LD of the joints 80 in the first portion P1 being the same as or larger than the spacing k2 in the front-to-rear direction LD of the joints 80 in the second portion P2.

[0075] In this way, the waist elastic member 17 is covered with the outer portion 18 formed by joining the first sheet 12S and the second sheet 12H, and the outer portion 18 has a smaller area of ​​the joint 80 at the first portion P1 near the edge We of the waist opening WO and the distance k1 of the joint 80 is the same or wider, so that the outer surface of the first portion P1 feels softer against the skin, while the first sheet 12S and the second sheet 12H are less likely to shift when the edge We of the waist opening WO is formed by folding back the first sheet 12S and the second sheet 12H, and when the product is worn. Also, as shown in Fig. 8, when the waist elastic member 17 is covered with the inner portion 19 having two layers of the first sheet 12S and the second sheet 12H, the covered portion also feels soft against the inner surface (wearer's) skin.

[0076] The inner portion 19 may also have joints 80 within the same dimensional range as the first portion P1 of the outer portion 18. That is, the inner portion 19 has a plurality of joints 80 intermittently arranged in the front-to-rear direction LD via non-jointed portions 83, and the area of ​​each joint 80 in the inner portion 19 is smaller than the area of ​​each joint 80 in the second portion P2, and the interval k4 in the front-to-rear direction LD of the joints 80 in the inner portion 19 is the same as or longer than the interval k2 in the front-to-rear direction LD of the joints 80 in the second portion P2, which is preferable because it makes the inner surface soft to the touch while preventing the first sheet 12S and the second sheet 12H from shifting easily when the edge We of the waist opening WO is formed by folding back the first sheet 12S and the second sheet 12H, and when the product is worn. 8 and 9, when one of the first sheet 12S and the second sheet 12H of the inner portion 19 extends further toward the center in the front-to-rear direction LD than the other sheet, a trace 80m similar to the joint 80 may remain in the extended portion, or it may not remain at all. Also, when this one sheet extends to the waist lower portion U, a trace 80m similar to the joint 80 may remain partway (illustrated example) or over the entire extended portion, or it may not remain at all.

[0077] The outer portion 18 preferably does not have a joint 80 in the region from the edge We of the waist opening WO to a position 3 mm away from the crotch side. Similarly, the inner portion 19 preferably does not have a joint 80 in the region from the edge We of the waist opening WO to a position 3 mm away from the crotch side.

[0078] The position of the boundary between the first part P1 and the second part P2 can be determined as appropriate, but it is preferable that it be located in the central area when the area between the waist elastic member 17 closest to the waist opening WO and the waist elastic member 17 closest to the leg opening LO is divided into three equal parts in the front-to-back direction LD.

[0079] The area of ​​the joints 80 can be determined appropriately. For example, the area of ​​each joint 80 in the first portion P1 is 0.1 to 15 mm. 2 It is preferable that the thickness is 1 to 10 mm. 2It is more preferable that the area of ​​each joint 80 in the second portion P2 is 1.1 to 3.0 times, and more preferably 1.5 to 2.5 times, the area of ​​each joint 80 in the first portion P1. When the joints 80 are provided up to the waist lower portion U as in the outer portion 18 in the illustrated example, the area of ​​each joint 80 in the waist lower portion U can be the same as or larger than the area of ​​each joint 80 in the second portion P2.

[0080] The total length j1, j2 and the total width s1, s2 of each joint 80 can be appropriately determined, but for example, the total length j1 of the first portion P1 is preferably 0.5 to 3 mm, and more preferably 1 to 2 mm. The total length j2 of the joint 80 of the second portion is preferably 1.1 to 3.0 times the total length j1 of the first portion P1, and more preferably 2 to 3 times. The total width s1 of the first portion P1 is preferably 0.1 to 3.0 mm, and more preferably 0.3 to 2.0 mm. The total width s2 of the joint 80 of the second portion is preferably 1.0 to 1.5 times the total width s1 of the first portion P1, and more preferably 1.0 to 1.2 times. When the joints 80 are provided up to the lower waist portion U, as in the outer portion 18 in the illustrated example, the overall length j3 and overall width s3 of each joint 80 at the lower waist portion U can be the same as or greater than the overall length j2 and overall width s2 of each joint 80 in the second portion P2, respectively.

[0081] The intervals k1, k2 of the joints 80 in the front-rear direction LD can be appropriately determined. For example, the interval k1 of the joints 80 in the front-rear direction LD in the first portion P1 is preferably 2 to 15 mm, more preferably 5 to 10 mm. The interval k2 of the joints 80 in the front-rear direction LD in the second portion P2 is preferably 0.3 to 1.0 times, more preferably 0.5 to 1.0 times, the interval k1 of the joints 80 in the front-rear direction LD in the first portion P1. When the joints 80 are provided up to the waist lower portion U as in the outer portion 18 of the illustrated example, the interval k3 of the joints 80 in the front-rear direction LD in the waist lower portion U can be the same as or shorter than the interval k2 of the joints 80 in the front-rear direction LD in the second portion P2. The joints 80 may be continuous (the interval in the front-rear direction LD is zero) from the waist lower elastic member 15 closest to the waist opening WO in the waist lower portion U to the waist lower elastic member 15 furthest from the waist opening WO.

[0082] The shape of the joint 80 can be determined as appropriate, for example, a rectangular shape as shown in the example, a parallelogram or trapezoid with both ends inclined in the forward / backward direction LD, a polygonal shape such as a triangle or pentagon, a circle or ellipse, a star shape or a cloud shape, or the like.

[0083] The overall width of the joints 80 may be changed depending on the location in order to change the area and spacing of the joints 80, but it is preferable that the overall width of all the joints 80 is the same since this increases manufacturing stability. In this case, it is preferable that the joints 80 have a shape having a pair of parallel sides along the front-to-rear direction LD (for example, a rectangular shape as in the illustrated example, a parallelogram shape, a hexagon shape, etc.), since the area and spacing of the joints 80 can be changed simply by changing the overall length of the joints 80.

[0084] The waist elastic member 17 provided in the waist portion W is provided between the outer portion 18 and the inner portion 19 in the example shown in Figures 8 and 9, but as shown in Figures 10 and 11, it is provided between the first sheet 12S and the second sheet 12H in the inner portion 19, and the first sheet 12S and the second sheet 12H in the inner portion 19 may be welded via the waist elastic member 17 at the portion having the waist elastic member 17 (crossing portion) and directly at the portion not having the waist elastic member 17 (non-crossing portion). In this case, the joint 80 in the inner portion 19 may be continuous (the interval in the front-to-back direction LD is zero) from the waist elastic member 17 closest to the waist opening WO to the waist elastic member 17 furthest from the waist opening WO as in the example shown in Figures 10 and 11, or may be arranged intermittently in the front-to-back direction LD as in the example shown in Figures 8 and 9.

[0085] 10 and 11, both the first sheet 12S and the second sheet 12H of the inner portion 19 extend to the same position in the front-to-rear direction LD in the waist lower portion U, but as long as both sheets extend further toward the leg opening LO than the waist elastic member 17 closest to the leg opening LO, one sheet (for example, the first sheet 12S) may extend further toward the leg opening LO than the other sheet (not shown). In this case, the extended portion may have a trace similar to the joint 80 partially or entirely, or may not have any trace at all. As shown in Figures 10 and 11, when both the first sheet 12S and the second sheet 12H of the inner portion 19 extend to the lower waist portion U, the joints 80 of the first sheet 12S and the second sheet 12H may be provided in the extended portion in a pattern similar to that of the inner portion 19. However, when the extended portion does not have a lower waist elastic member 15 as in the illustrated example, it is preferable that the joints 80 are intermittently arranged in the front-to-back direction LD at the joint position 90 via non-joints 83, as in the first portion P1.

[0086] 10 and 11, the waist elastic member 17 is covered with an outer portion 18 formed by joining two layers, a first sheet 12S and a second sheet 12H, and the outer portion 18 has a smaller area of ​​the joint 80 in the first portion P1 near the edge We of the waist opening WO and the spacing of the joints 80 is the same or wider. As a result, the outer surface of the first portion P1 feels softer against the skin, but the first sheet 12S and the second sheet 12H are less likely to slip when the first sheet 12S and the second sheet 12H are folded back to form the edge We of the waist opening WO and when the product is worn.

[0087] In particular, the example shown in Figures 10 and 11 is preferable because it forms the first sheet 12S and the second sheet 12H from the lower waist portion U of the outer body 12F, 12B to the inner portion 19 of the waist portion W, sandwiches both the waist elastic member 17 and the lower waist elastic member 15 between the first sheet 12S and the second sheet 12H, and welds the first sheet 12S and the second sheet 12H at the above-mentioned joining position 90, allowing the basic structure of the outer body 12F, 12B to be constructed in a single welding process.

[0088] Other points of the example shown in FIGS. 10 and 11 are similar to the example shown in FIGS.

[0089] On the other hand, in order to improve manufacturing stability, it is better for all of the joints 80 to have the same bond strength. However, the bond strength of some of the joints 80 may be different from the bond strength of the other joints 80, or the bond strength may vary within a single continuous joint 80 (joints 80 with different strengths may be continuous).

[0090] For example, as shown in Figures 12 and 13, when the area in the first portion P1 that is 10 mm or less from the edge We of the waist opening WO toward the leg opening LO is defined as the outer edge region Eo, and the area in the inner portion 19 that is 10 mm or less from the edge We of the waist opening WO toward the leg opening LO is defined as the inner edge region Ei, of the joints 80 located in the outer edge region Eo and the inner edge region Ei, one joint 80 is a strong joint 81 having a relatively high joint strength, and the other joints 80 are weak joints 82 having a relatively low joint strength, and it is preferable that the joints 80 located in the area of ​​the first portion P1 excluding the outer edge region Eo and the area of ​​the inner portion 19 excluding the inner edge region Ei are weak joints 82.

[0091] In this way, at the joining position 9080 across the outer edge region Eo and the inner edge region Ei, by disposing a strong joint 81 at one location, the first sheet 12S and the second sheet 12H are firmly integrated near the folding position, which makes it easier to fold the first sheet 12S and the second sheet 12H when folding them to form the edge We of the waist opening WO, and makes it difficult for the first sheet 12S and the second sheet 12H to shift at the edge We of the waist opening WO or in its vicinity when the product is worn. Moreover, in the first portion P1 and the inner portion 19, all of the joining portions 80 except for the one strong joint 81 are weak joints 82, so flexibility is hardly lost.

[0092] Here, the strength of the joint 80 (joint strength) refers to the magnitude of the tensile force required to tear the joint 80 per unit area or unit length. The degree of strength of the joint can be determined as appropriate, but for example, the strong joint 81 is preferably such that almost all the fibers of the first sheet 12S and the second sheet 12H are melted and integrated (for example, less than 10 fibers may protrude) and are in a film shape (more transparent than the surroundings). Also, the weak joint 82 is preferably such that some or all of the fibers located on the joint surface of the first sheet 12S and the second sheet 12H are welded, but some or all of the fibers on the opposite surface are not welded, and many fibers remain deformable.

[0093] The dimensions of the strong bond portion 81, the weak bond portion 82, and the non-bond portion 83 can be determined appropriately, but are preferably within the following ranges, for example. Dimension of the strong joint 81 in the front-rear direction LD: 2 to 4 mm The dimension of the weak joint 82 in the front-rear direction LD: 1.0 to 2.0 times the dimension of the strong joint 81 in the front-rear direction LD The dimension of the non-bonded portion 83 in the front-rear direction LD: 0.5 to 1.2 times the dimension of the weakly bonded portion 82 in the front-rear direction LD

[0094] The thicknesses of the strong bond portion 81, the weak bond portion 82, and the non-bond portion 83 can be determined appropriately, but are preferably within the following ranges, for example. Apparent thickness of the weakly joined portion 82: 0.5 to 0.9 times the sum of the apparent thickness of the first sheet 12S and the apparent thickness of the second sheet 12H in the non-jointed portion 83 Apparent thickness of the strong joint 81: 0.5 to 0.9 times the apparent thickness of the weak joint 82

[0095] The strong joint 81 provided at one joining position 90 across the outer edge region Eo and the inner edge region Ei can be provided in the outer edge region Eo, but if it is provided in the inner edge region Ei, it is particularly easy to fold the first sheet 12S and the second sheet 12H inward to form the edge We of the waist opening WO, and at that time and when the product is worn, the strong joint 81 is located in the inner part 19, making it difficult for the first sheet 12S and the second sheet 12H in the inner part 19 to shift at the edge We of the waist opening WO and its vicinity. In this case, the strong joint 81 provided in the inner edge region Ei is preferably within a range of 1 to 9 mm from the edge We of the waist opening toward the leg opening, and particularly preferably within a range of 2 to 8 mm. In addition, since the strong joint 81 is a thin and hard part, if it is provided in the inner edge region Ei, if the waist elastic member 17 and the strong joint 81 overlap, the feel on the skin of the wearer is likely to be deteriorated. Therefore, it is preferable that the strong joint portion 81 provided at one joining position 90 in the inner edge region Ei and the waist elastic member 17 located closest to the waist opening WO do not overlap as in the illustrated example. From this viewpoint, and from the viewpoint of sufficient formation of shrinkage wrinkles at the edge We of the waist opening WO, the distance in the front-to-back direction LD between the edge We of the waist opening WO and the waist elastic member 17 located closest to the waist opening WO is preferably 0 to 5 mm. On the other hand, when the strong joint portion 81 is provided in the outer edge region Eo, it is preferable that the strong joint portion 81 is within a range of 0 to 5 mm from the edge We of the waist opening to the leg opening side.

[0096] In terms of flexibility, it is preferable that the second portion P2 does not have the strong bonded portion 81, as in the first portion P1 except for the outer edge region Eo. However, if the entire waist portion W is flexible, the shape of the waist portion W may be deformed, resulting in a poor fit and appearance. Therefore, as shown in the illustrated example, at the joining position 90 in the second portion P2, the strong bonded portion 81, which has a relatively high bond strength, is intermittently arranged in the front-rear direction LD via at least one of the weak bonded portion 82 and the non-bonded portion 83, which has a relatively low bond strength. In this case, it is preferable that the strong bonded portion 81 located closest to the waist opening WO side in the second portion P2 is located in the range from the third waist elastic member 17 to the sixth waist elastic member 17 counting from the waist opening WO side, because the strong bonded portion 81 improves rigidity and reduces the risk of the shape of the waist portion W being deformed, resulting in a poor fit and appearance.

[0097] The strength of the joint in the waist lower portion U can be appropriately determined, and for example, the entire portion can be a strong joint portion 81, or the portion having the waist lower elastic member 15 (intersection portion) can be a weak joint portion 82, and the other portion not having the waist lower elastic member 15 (non-intersection portion) can be a strong joint portion 81. One preferred example is similar to that described in Patent Document 2, in which strong joint portions 81 are adjacently disposed on both sides of the waist lower elastic member 15 in the front-to-rear direction LD at the joint position 90 in the waist lower portion U, and the portion between the adjacent strong joint portions 81 between the adjacent waist lower elastic members 15 is a weak joint portion 82. In this case, the intersection portion between the joint position 90 and the waist lower elastic member 15 is preferably a weak joint portion 82 as shown in the illustrated example, as long as the first sheet 12S and the second sheet 12H are welded to the waist lower elastic member 15, but may be a strong joint portion 81. Furthermore, if the arrangement of the strong joint parts 81 changes at the boundary between the waist lower part U and the waist part W, the texture will suddenly change, which may cause horizontal wrinkles to occur at the boundary or cause an uncomfortable feeling at the boundary. Therefore, as described above, it is preferable that the second part P2 also has strong joint parts 81, and that the dimensions and spacing of the strong joint parts 81 at the joining position 90 of the second part P2 are equal to the dimensions and spacing of the strong joint parts 81 located closest to the waist opening WO at the joining position 90 of the waist lower part U.

[0098] The waist elastic member 17 provided in the waist portion W is provided between the outer portion 18 and the inner portion 19 in the example shown in Figures 12 and 13, but as shown in Figures 14 and 15, it may be provided between the first sheet 12S and the second sheet 12H in the inner portion 19, and the first sheet 12S and the second sheet 12H may be welded together via the waist elastic member 17 at the portions having the waist elastic member 17 (intersection portions) and directly at the portions not having the waist elastic member 17 (non-intersection portions). In the latter case, the inner edge region Ei has at least one waist elastic member 17, and at the joining position 90 in the inner portion 19, strong joint portions 81 with relatively high joining strength are arranged on both sides of the waist elastic member 17 in the front-to-back direction LD, and the portions between adjacent strong joint portions 81 between adjacent waist lower elastic members 15 are weak joint portions 82, and it is preferable that at the joining position 90 in the first part P1 of the outer portion 18, the weak joint portions 82 are arranged intermittently in the front-to-back direction LD via non-joint portions 83.

[0099] 14 and 15, both the first sheet 12S and the second sheet 12H of the inner portion 19 extend to the same position in the front-to-rear direction LD in the waist lower portion U, but as long as both sheets extend further toward the leg opening LO than the waist elastic member 17 closest to the leg opening LO, one sheet (for example, the first sheet 12S) may extend further toward the leg opening LO than the other sheet (not shown). In this case, the extended portion may have traces similar to the strong bonded portion 81 and the weak bonded portion 82 partway or over the entirety, or may not have any traces at all. As shown in Figures 14 and 15, when both the first sheet 12S and the second sheet 12H of the inner portion 19 extend to the lower waist portion U, the joints 81, 82 of the first sheet 12S and the second sheet 12H may be provided in the extended portion in a pattern similar to that of the inner portion 19. However, when the extended portion does not have a lower waist elastic member 15 as in the illustrated example, it is preferable that the joint position 90 has weak joints 82 intermittently arranged in the front-to-back direction LD via non-joints 83, as in the first portion P1.

[0100] 14 and 15, the elastic member of the waist portion W is covered with an outer portion 18 formed by joining two layers, a first sheet 12S and a second sheet 12H, and the first portion P1 does not have a strong joint 81, and weak joints 82 are arranged intermittently in the front-to-back direction LD via non-joined portions 83 to integrate the first sheet 12S and the second sheet 12H. Therefore, while the outer surface feels soft against the skin, the first sheet 12S and the second sheet 12H are less likely to slip when the first sheet 12S and the second sheet 12H are folded back to form the edge We of the waist opening WO and when the product is worn. Furthermore, by arranging the strong joint 81 in the inner portion 19 including the inner edge region Ei, the first sheet 12S and the second sheet 12H are firmly integrated near the folding position, making it easier to fold the first sheet 12S and the second sheet 12H when folding them to form the edge We of the waist opening WO, and at that time and when the product is worn, the first sheet 12S and the second sheet 12H are less likely to shift at the edge We of the waist opening WO and in its vicinity.

[0101] In particular, the example shown in Figures 14 and 15 is preferable in that the portion of the outer body 12F, 12B from the lower waist portion U to the inner portion 19 of the waist portion W is formed from a first sheet 12S and a second sheet 12H, and both the waist elastic member 17 and the lower waist elastic member 15 are sandwiched between the first sheet 12S and the second sheet 12H, and the first sheet 12S and the second sheet 12H are welded at the above-mentioned joining position 90, allowing the basic structure of the outer body 12F, 12B to be constructed in a single welding process.

[0102] In other respects, the example shown in FIGS. 14 and 15 can employ the same structure as the example shown in FIGS.

[0103] (Non-woven cover) In a pants-type disposable diaper with a two-part exterior, the inner body 200 is exposed between the front exterior body 12F and the rear exterior body 12B. Therefore, in order to prevent the liquid-impermeable sheet 11 from being exposed on the back surface of the inner body 200, it is preferable to provide a cover nonwoven fabric 13 that covers the back surface of the inner body 200 from between the front exterior body 12F and the inner body 200 to between the rear exterior body 12B and the inner body 200.

[0104] The nonwoven fabric used for the cover nonwoven fabric 13 can be appropriately selected from the same material as the exterior bodies 12F and 12B, and is not particularly limited by the type of fiber or the method of bonding (intertwining) the fibers. It is preferable to use an air-through nonwoven fabric, in which case the basis weight is 20 to 40 g / m 2 The thickness is preferably 0.3 to 1.0 mm. The cover nonwoven fabric 13 may be a non-porous nonwoven fabric that has no holes penetrating from the front to the back, or a porous nonwoven fabric that has a large number of holes spaced apart from one another penetrating from the front to the back.

[0105] The front-rear direction range of the cover nonwoven fabric 13 is not particularly limited, and may extend in the front-rear direction LD over the entire area from the front end to the rear end of the inner body 200 as shown in Fig. 2 and Fig. 5, or may extend in the front-rear direction LD from the front-rear direction middle position of the area where the front exterior body 12F and the inner body 200 overlap to the front-rear direction middle position of the area where the rear exterior body 12B and the inner body 200 overlap as shown in Fig. 7. In the example shown in Fig. 7, the front-rear direction length 13y of the overlapping portion between the cover nonwoven fabric 13 and the front exterior body 12F and the front-rear direction length 13y of the overlapping portion between the cover nonwoven fabric 13 and the rear exterior body 12B can be appropriately determined, but usually can be about 20 to 40 mm each.

[0106] The width direction range of the cover nonwoven fabric 13 is set to a range capable of hiding the exposed back surface portion of the liquid-impermeable sheet 11. For this reason, in the illustrated example, since the liquid-impermeable sheet 11 is exposed between the base ends of the left and right rising gathers 60, the cover nonwoven fabric 13 is provided so as to cover at least the width direction range from the back side of the base end of one rising gather 60 to the back side of the base end of the other rising gather 60. This allows the liquid-impermeable sheet 11 to be hidden by the cover nonwoven fabric 13 and the gathered nonwoven fabric 62 of the rising gathers 60. Also, even if the width direction ends of the cover nonwoven fabric 13 do not cover the back sides of the base ends of the rising gathers 60, but the gathered nonwoven fabric 62 covers the back sides of the width direction ends of the cover nonwoven fabric 13, it is possible for the cover nonwoven fabric 13 and the gathered nonwoven fabric 62 to hide the liquid-impermeable sheet 11. In this case, since both side edges of the cover nonwoven fabric 13 are covered with the gathered nonwoven fabric 62, there is an advantage that both side edges of the cover nonwoven fabric 13 are less likely to peel off from the liquid-impermeable sheet 11.

[0107] The inner and outer surfaces of the cover nonwoven fabric 13 can be bonded to the opposing surfaces via a hot melt adhesive. The fixed area of ​​the cover nonwoven fabric 13 can be the entire front-rear direction and the entire width direction of the cover nonwoven fabric 13, or a part of the fixed area can be left unfixed. For example, if both ends of the width direction of the cover nonwoven fabric 13 are unfixed, the cover nonwoven fabric 13 is less susceptible to the influence of the rising gathers 60 even if the sides of the absorbent body 56 are somewhat shrunk, which is advantageous in that wrinkles and folds are less likely to form in the cover nonwoven fabric 13. In this case, the width of the unfixed parts of both ends of the width direction of the cover nonwoven fabric 13 can be appropriately determined, and can be, for example, 3 to 10 mm, preferably 5 to 8 mm.

[0108] (Interior joints) The inner body 200 can be fixed to the outer bodies 12F, 12B by a joining means using material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive. In the illustrated example, the inner body 200 is fixed to the inner surface of the outer bodies 12F, 12B via a hot melt adhesive applied to the back surface of the inner body 200, that is, in this case, the back surface of the liquid-impermeable sheet 11 and the root portion 65 of the rising gathers 60. The inner body joints 201, 202 that fix the inner body 200 and the outer bodies 12F, 12B can be provided in almost the entire overlapping area as shown in FIG. 2, and can also be provided in a portion excluding both ends in the width direction of the inner body 200, for example.

[0109] <Explanation of terms used in the specification> As used herein, the following terms have the following meanings unless otherwise specified in the specification.

[0110] The "front-rear direction" refers to the direction indicated by the symbol LD in the drawing (longitudinal direction), and the "width direction" refers to the direction indicated by the symbol WD in the drawing (left-right direction), with the front-rear direction and the width direction being perpendicular to each other.

[0111] "Front side" means the side closest to the wearer's skin when the pants-type disposable diaper is worn, and "reverse side" means the side furthest from the wearer's skin when the pants-type disposable diaper is worn.

[0112] "Front surface" means the surface of a component that is closest to the wearer's skin when the pants-type disposable diaper is worn, and "back surface" means the surface that is farthest from the wearer's skin when the pants-type disposable diaper is worn.

[0113] "Elongation rate" refers to the value when the natural length is 100%. For example, an elongation rate of 200% is equivalent to an elongation ratio of 2 times.

[0114] "Gel strength" is measured as follows: 1.0g of superabsorbent polymer is added to 49.0g of artificial urine (a mixture of urea: 2wt%, sodium chloride: 0.8wt%, calcium chloride dihydrate: 0.03wt%, magnesium sulfate heptahydrate: 0.08wt%, and ion-exchanged water: 97.09wt%) and stirred with a stirrer. The resulting gel is left in a thermo-hygrostat at 40℃ x 60%RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (I.techno Engineering: Curdmeter-MAX ME-500).

[0115] - "Basis weight" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device under standard conditions (test location: temperature 23±1°C, relative humidity 50±2%) until it reaches a constant weight. Pre-drying refers to bringing the sample or test piece to a constant weight in an environment at a temperature of 100°C. Note that pre-drying is not necessary for fibers with an official moisture regain of 0.0%. From the test piece that has reached a constant weight, a sample template (100mm x 100mm) is used to cut out a sample measuring 100mm x 100mm. The weight of the sample is measured and multiplied by 100 to calculate the weight per square meter, which is the basis weight.

[0116] "Thickness" is measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) with a load of 0.098N / cm 2 , and pressure area: 2cm 2 The measurement is performed automatically under the following conditions.

[0117] The water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resins".

[0118] The water absorption rate is the "time to the end point" when 2g of superabsorbent polymer and 50g of physiological saline are used and the JIS K7224-1996 "Test method for water absorption rate of superabsorbent polymers" is performed.

[0119] "Unfolded state" means a flat, unfolded state without contraction (including any contraction, such as contraction due to elastic members) or sagging.

[0120] *Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not in the natural length state.

[0121] If no specification is given regarding the environmental conditions for a test or measurement, the test or measurement shall be carried out in a test room or equipment under standard conditions (the test location shall be a temperature of 23±1°C and a relative humidity of 50±2%). [Industrial Applicability]

[0122] The present invention can be used in pants-type disposable wearing articles such as pants-type disposable diapers and pants-type sanitary napkins. [Explanation of symbols]

[0123] 11...liquid-impermeable sheet, 12A...side seal, 12B...rear exterior body, 12E...waist extension portion, 12F, 12B...exterior body, 12F...front exterior body, 12H...second sheet, 12S...first sheet, 13...cover nonwoven fabric, 15...waist lower elastic member, 17...waist elastic member, 18...outer portion, 19...inner portion, 200...interior body, 201, 202...interior joint portion, 30...top sheet, 40...middle sheet, 50...absorbent element, 56...absorbent body, 58...packaging sheet, 60...rise gather, 60A...tip side portion, 60B...attachment Root side portion, 62...gathered nonwoven fabric, 67...laid-down portion, 68...free portion, 80...jointed portion, 81...strongly joined portion, 82...weakly joined portion, 83...non-jointed portion, 90...jointed position, 91...non-jointed position, A1...non-stretchable region, A2...stretchable region, B...back body, C...buttocks covering portion, Ei...inner edge region, Eo...outer edge region, F...front body, HM...hot melt adhesive, L...middle region, LD...front to back direction, LO...leg opening, P1...first portion, P2...second portion, T...torso region, U...lower waist portion, W...waist portion, WD...width direction, WO...waist opening.

Claims

1. The garment comprises an annular waist region formed by joining both sides of a front body and both sides of a rear body, a middle region extending from the waist region of the front body through a crotch region to the waist region of the rear body, a waist opening provided on the side of the waist region opposite to the middle region, leg openings provided on both sides of the middle region in the width direction, an exterior body forming at least the waist region, and an interior body attached to the exterior body so as to extend from the front body to the rear body, The exterior body has a waist portion defined as an end portion on the waist opening side, the waist portion has an outer portion in which a first sheet made of nonwoven fabric and a second sheet made of nonwoven fabric are laminated, and an inner portion formed by folding the first sheet and the second sheet continuing from the outer portion inward at an edge of the waist opening, with at least one of the sheets extending over the entire waist portion; the inner portion is joined to the outer portion; The waist portion has a plurality of elongated waist elastic members provided between the outer portion and the inner portion along a width direction and spaced apart from one another, The first sheet and the second sheet are provided with alternately and repeatedly in a width direction a joining position that continues in a front-rear direction across the outer portion and the inner portion and a non-joint position that continues in a front-rear direction across the outer portion and the inner portion, the joining position includes a joining portion where the first sheet and the second sheet are welded and joined, The outer portion of the waist portion has a first portion located on the waist opening side from a midpoint in a front-to-rear direction, and a second portion located on the opposite side, the waist portion has at least one waist elastic member at a position overlapping the first portion and at least one waist elastic member at a position overlapping the second portion, In the first portion and the second portion, a plurality of the joint portions are intermittently arranged in a front-rear direction with non-joint portions interposed therebetween, an area of ​​each joint in the first portion is smaller than an area of ​​each joint in the second portion; A distance between the joints in the first portion in the front-rear direction is equal to or greater than a distance between the joints in the second portion in the front-rear direction. A pants-type disposable wearing article.

2. In the inner portion, a plurality of the joint portions are intermittently arranged in the front-rear direction with non-joint portions interposed therebetween, an area of ​​each joint in the inner portion is smaller than an area of ​​each joint in the second portion; A distance between the joints in the inner portion in the front-rear direction is equal to or longer than a distance between the joints in the second portion in the front-rear direction.

2. The pants-type disposable wearing article according to claim 1.

3. the overall width of all said joints is equal; 3. The pants-type disposable wearing article according to claim 1 or 2.

4. The bonding strength of all the bonding portions is equal. The pants-type disposable wearing article according to any one of claims 1 to 3.

5. the first portion has an outer edge region that is 10 mm or less from an edge of the waist opening toward the leg opening, and the inner portion has an inner edge region that is 10 mm or less from an edge of the waist opening toward the leg opening, Among the joints located in the outer edge region and the inner edge region, one of the joints is a strong joint having a relatively high joint strength, and the other joints are weak joints having a relatively low joint strength, the joint portion located in a region of the first portion excluding the outer edge region and in a region of the inner portion excluding the inner edge region are the weak joint portion; The pants-type disposable wearing article according to any one of claims 1 to 4.

6. The exterior body of the torso portion has a waist lower portion continuing to the leg opening side of the waist portion, the lower waist portion includes the first sheet and the second sheet continuing from the outer portion, and a plurality of elongated lower waist elastic members provided between the first sheet and the second sheet along the width direction and spaced apart from each other, the joining position and the non-jointing position are continuous from the waist portion to the lower waist portion, At the joining position in the waist lower portion, the strong joining portions are adjacently disposed on both sides of the waist lower elastic member in the front-rear direction, and weak joining portions are disposed between adjacent strong joining portions between adjacent waist lower elastic members, the size and spacing of the strong joints at the joining position of the second portion are equal to the size and spacing of the strong joints located closest to the waist opening at the joining position of the waist lower portion; 6. The pants-type disposable wearing article according to claim 5.

7. The area of ​​each joint of the first portion is 0.1 to 15 mm ２ and an area of ​​each joint in the second portion is 1.1 to 3 times an area of ​​each joint in the first portion; The distance between the joints in the first portion in the front-rear direction is 2 to 15 mm, The distance between the joints in the second portion in the front-rear direction is 0.3 to 1.0 times the distance between the joints in the first portion in the front-rear direction. The pants-type disposable wearing article according to any one of claims 1 to 6.

8. The garment comprises an annular waist region formed by joining both sides of a front body and both sides of a rear body, a middle region extending from the waist region of the front body through a crotch region to the waist region of the rear body, a waist opening provided on the side of the waist region opposite to the middle region, leg openings provided on both sides of the middle region in the width direction, an exterior body forming at least the waist region, and an interior body attached to the exterior body so as to extend from the front body to the rear body, The exterior body has a waist portion defined as an end portion on the waist opening side, the waist portion has an outer portion in which a first sheet made of nonwoven fabric and a second sheet made of nonwoven fabric are laminated, and an inner portion formed by folding the first sheet and the second sheet continuing from the outer portion inwardly at an edge of the waist opening and extending over the entire waist portion, the inner portion is joined to the outer portion; the waist portion has a plurality of elongated waist elastic members provided at intervals between the first sheet and the second sheet in the inner portion along the width direction, The first sheet and the second sheet are provided with alternately and repeatedly in a width direction a joining position that continues in a front-rear direction across the outer portion and the inner portion and a non-joint position that continues in a front-rear direction across the outer portion and the inner portion, At the joining position, the first sheet and the second sheet have a joining portion which is welded and joined via the waist elastic member at a portion having the waist elastic member therebetween and directly at a portion not having the waist elastic member, The outer portion of the waist portion has a first portion located on the waist opening side from a midpoint in a front-to-rear direction, and a second portion located on the opposite side, the inner portion has at least one waist elastic member at a position overlapping the first portion and at least one waist elastic member at a position overlapping the second portion, In the first portion and the second portion, a plurality of the joint portions are intermittently arranged in a front-rear direction with non-joint portions interposed therebetween, an area of ​​each joint in the first portion is smaller than an area of ​​each joint in the second portion; A distance between the joints in the first portion in the front-rear direction is equal to or longer than a distance between the joints in the second portion in the front-rear direction. A pants-type disposable wearing article.

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