Underpants-type absorbent article

Abstract

To provide an underpants-type absorbent article compatibly achieving expansion of a shielding range and stability of a position and a shape of folded parts.SOLUTION: An underpants-type absorbent article is so configured that a front end and a rear end of an inner wrapper 200 are low rigidity regions 202 having no absorbent body 56, at least one of the front and rear folded parts 67 of rising gathers 60 has an edge on a center side in the width direction WD located closer to the center side in the width direction WD than the side edge of the absorbent body 56 and is located only in the low rigidity region 202, and a boundary between the folded part 67 located only in the low rigidity region 202 and a rising part 68 is located at 0 to 15 mm toward a waist opening WO side from an edge on the waist opening WO side of the absorber 56.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a pants-type absorbent article having rising gathers. [Background technology]

[0002] A pants-type absorbent article such as a pants-type disposable diaper includes an integrated outer body extending from the front body to the rear body, or an outer body provided separately on the front body and the rear body, an inner body provided in the middle in the width direction so as to extend from the front body to the rear body, an absorbent body built into the inner body from the front body to the rear body, and an inner body fixing part where the inner body is fixed to the outer body, and a waist opening and a pair of left and right leg openings are formed by joining both sides of the outer body in the front body and both sides of the outer body in the rear body to each other to form side seals. The outer body is provided with an elastic member in the waist area defined as the front-rear direction range having the side seals (the front-rear direction range from the waist opening to the upper end of the leg openings), so that the width direction stretchability is added. As the elastic member, in addition to one using a long and thin elastic member such as rubber thread, one using an elastic film is also known (see, for example, Patent Documents 1 and 2).

[0003] Moreover, such pants-type absorbent articles have rising gathers on both sides of the width of the inner body, spanning the entire front-to-rear direction of the inner body. More specifically, the rising gathers have a main body portion extending from a position along the side edge of the absorbent body in the inner body to the front side of the inner body, a fallen portion formed by fixing both front-to-rear end portions of this main body portion in a fallen state to the surface of the inner body, a non-fixed rising portion located between the front and rear fallen portions, and a gather elastic member provided along the front-to-rear direction at least at the tip of this rising portion. In such rising gathers, the rising portion contracts together with the gather elastic member to rise from the surface of the inner body, blocking the lateral movement of excrement.

[0004] Like the rising gathers described in Patent Document 1, when the fallen part having the function of supporting the rising part is located on the absorbent body and fixed to the absorbent body, the rigidity of the part having the absorbent body is higher than that of the other parts, which makes it easier to stabilize the position and shape of the fallen part, and thus allows the rising gathers to function properly, which is preferable. However, in this case, the rising part is limited within the range of the absorbent body in the front-rear direction, and as a result, the blocking range is also limited.

[0005] On the other hand, like the rise-up gathers described in Patent Document 2, when the fallen portion having the function of supporting the rise-up portion is fixed to the side of the side edge of the absorbent body and closer to the waist opening than the waist opening side edge of the absorbent body, the front-to-rear dimension of the rise-up portion, i.e., the blocking range, is not limited by the front-to-rear dimension of the absorbent body. However, since the fixing area of ​​the fallen portion is flexible, the position and shape of the fallen portion are less likely to be stable, which may prevent the rise-up gathers from functioning properly. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2019-118555 A [Patent Document 2] Patent Publication No. 2022-36202 Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, a main object of the present invention is to achieve both an expansion of the blocking range of the rising gathers and stability of the position and shape of the fallen portion. [Means for solving the problem]

[0008] The pants-type absorbent article that solves the above problems is as follows. <First aspect> An integrated outer body extending from the front body to the back body, or an outer body provided separately on the front body and the back body; An inner body provided in the middle portion in the width direction so as to extend from the front body to the rear body; An absorbent body incorporated in the inner body so as to extend from the front body to the rear body; An interior fixing portion where the interior body is fixed to the exterior body; side seals in which both side portions of the exterior body of the front body and both side portions of the exterior body of the back body are joined together; A waist opening and a pair of left and right leg openings are provided, The inner body has risen gathers on both sides in the width direction thereof, the risen gathers extending over the entire front-rear direction of the inner body, The front end and the rear end of the inner body are low-rigidity regions that do not have the absorbent body, The rising gathers have a main body portion extending from a position along the side edge of the absorbent body in the inner body to the front side of the inner body, a fallen portion formed by fixing the front end and rear end of the main body portion to the surface of the inner body in a fallen state, a non-fixed rising portion located between the front and rear fallen portions, and a gather elastic member provided along the front-rear direction at least at the tip of the rising portion, At least one of the front and rear collapsed portions has an edge on the center side in the width direction located closer to the center side in the width direction than a side edge of the absorbent body, and is located only within the low stiffness region, The boundary between the fallen portion located only in the low stiffness region and the raised portion is located 0 to 15 mm toward the waist opening from the edge of the waist opening side of the absorbent body. A pants-type absorbent article characterized by:

[0009] (Action and effect) In the rising gathers of this pants-type absorbent article, at least one of the front and rear fallen parts having the function of supporting the rising parts is fixed to a low-rigidity area (i.e., closer to the waist opening than the edge of the waist opening side of the absorbent body), so the blocking range is expanded to the waist opening side of the absorbent body. Nevertheless, because the fallen part is disposed close to the absorbent body with high rigidity, the position and shape of the fallen part are unlikely to change.

[0010] <Second aspect> The width of the fixed region of the fallen portion is 50% or more of the width of the fallen portion. A pants-type absorbent article according to a first embodiment.

[0011] (Action and effect) In order to stabilize the position and shape of the fallen portion, it is preferable that the width of the fixing region of the fallen portion is within the range of this embodiment.

[0012] <Third aspect> The torsional stiffness of a predetermined portion of the absorbent body, including the end portion on the waist opening side, is 0.10 to 0.32 N cm / cm. A pants-type absorbent article according to the first or second embodiment.

[0013] (Action and effect) If the rigidity of the absorbent body is within the range of this embodiment, it is preferable in terms of stabilizing the position and shape of the collapsed portion by the rigidity of the absorbent body, as described above.

[0014] <Fourth aspect> The interior fixing portion is provided to include a region that spans both sides of the low rigidity region in a width direction, The outer body has a waist circumference elastic member that is continuous in the width direction across at least the region overlapping with the low rigidity region of the inner body in a waist circumference region defined as a front-rear direction range having the side seal, The portion of the outer cover having the waist elastic member is subjected to a contraction force by the waist elastic member in a natural length state. A pants-type absorbent article according to any one of the first to third aspects.

[0015] (Action and effect) In the outer body of a pants-type absorbent article, a waist elastic member is generally provided in the waist region, which is defined as a front-rear range having side seals (front-rear range from the waist opening to the upper end of the leg openings), to impart widthwise elasticity. The low-rigidity region (front end and rear end) of the inner body has a step with the part having the absorbent body, and is a part that is likely to cause a gap between the skin. Therefore, if the waist elastic member in the waist region of the outer body is provided so as to cross the region overlapping with the low-rigidity region of the inner body, this part that is likely to cause a gap is pressed toward the skin over the entire width direction, which is preferable from the viewpoint of leak prevention. However, when the inner fixing part is provided so as to include a region that extends over both sides of the low-rigidity region in the width direction, if the fallen part is located in the low-rigidity region, the fallen part will also shrink in the width direction due to the contraction force of the waist elastic member, not only in the natural length state but also in the worn state where it is stretched to a certain extent, and the width of the fallen part will narrow, which may reduce the width of the rising part, i.e., the rising height. However, as mentioned above, when the fallen portion is positioned close to the absorbent body, the fallen portion is less likely to deform in the width direction at the end of the waist opening side of the inner body, making it less likely that gaps will form in the low rigidity area of ​​the inner body, while also minimizing the reduction in the rising height caused by a reduction in the width of the fallen portion.

[0016] <Fifth aspect> The rising gathers have a root portion fixed to the inner body on the back side of the absorbent body, and the main body portion is a portion folded back from the root portion to the front side of the inner body at a position along a side edge of the absorbent body, The side portion of the portion of the rising gather from the folded-back position to the back side of the absorbent body is not joined to a member adjacent to the back side. A pants-type absorbent article according to a fourth embodiment.

[0017] (Action and effect) When configured as in this embodiment, the contractile force of the waist elastic members is not transmitted to the fallen portion in the unjoined areas, so that a reduction in the risen height caused by a reduction in the width of the fallen portion is more reliably suppressed.

[0018] <Sixth aspect> The outer body has an innermost sheet layer that covers a width of the inner body on both sides in the width direction from a waist opening side of the inner body to a portion adjacent to a crotch side of the low stiffness region, the innermost sheet layer has a waist opening side that is a joined region joined to a member adjacent to the back side, and a crotch side that is a non-jointed region that is not joined to a member adjacent to the back side, based on a virtual line in the width direction passing through the fallen portion; A pants-type absorbent article according to any one of the first to fifth aspects.

[0019] (Action and effect) By providing the innermost sheet layer as in this embodiment, the edge of the waist opening side of the inner body can be covered, and the deterioration of the feel against the skin due to the edge can be prevented. In addition, the non-jointed area of ​​the innermost sheet layer also functions as a leakage prevention wall in the front-rear direction. However, if the innermost sheet layer is fixed to the rising part, even if the rising part is expanded toward the waist opening side by the above-mentioned structure, the movement of the rising part is hindered by the innermost sheet layer, and the fit of the rising gathers is reduced. Therefore, it is preferable to configure as in this embodiment and expand the rising part toward the waist opening while preventing the fit of the rising part from being reduced. Effect of the Invention

[0020] As described above, the present invention provides advantages such as being able to achieve both an expansion of the blocking range of the rising gathers and stability of the position and shape of the fallen portion. [Brief description of the drawings]

[0021] [Figure 1] 1 is a plan view (inner surface side) of a pants-type disposable diaper in an unfolded state. [Diagram 2]1 is a plan view (outer surface side) of a pants-type disposable diaper in an unfolded state. [Diagram 3] FIG. 2 is a plan view (inner surface side) showing a main part of the pants-type disposable diaper in an unfolded state. [Figure 4] FIG. 2 is a cross-sectional view of FIG. 1 along line 1-1. [Diagram 5] 2 is a cross-sectional view of FIG. 1 along line 2-2. [Figure 6] 3 is a cross-sectional view of FIG. 1 along line 3-3. [Figure 7] FIG. 2 is a perspective view of the pants-type disposable diaper in a worn state. [Figure 8] FIG. [Figure 9] 1 is an enlarged plan view (inner surface side) showing a main part of the front body in an unfolded state. [Figure 10] 1 is an enlarged plan view (inner surface side) showing a main portion of the rear body in an unfolded state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] An example of a pants-type disposable diaper will be described in detail below with reference to the attached drawings. The dotted pattern in the cross-sectional view indicates an adhesive HM as a joining means for joining each component located on the front and back sides, and is formed by solid, bead, curtain, summit or spiral application of hot melt adhesive, or pattern coating (transfer of hot melt adhesive using letterpress printing method), or alternatively or in addition, by application to the outer circumferential surface of the elastic member using a comb gun or SureWrap application. As hot melt adhesives, there are various types, such as EVA-based, adhesive rubber-based (elastomer-based), polyolefin-based, and polyester / polyamide-based, but any type can be used without particular limitation. As a joining means for joining each component, material welding means such as heat sealing and ultrasonic sealing can also be used.

[0023] 1 to 7 show an example of 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 rear exterior body 12B constituting at least the waist circumference of the rear body B, and an inner body 200 provided on the exterior bodies 12F, 12B so as to extend from the front exterior body 12F through the crotch region 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, whereby 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 width direction of the inner body 200 that are surrounded by the crotch side edges 14 of the exterior bodies 12F, 12B and the side edges of the inner body 200 respectively 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 an unfolded state with the side seal 12A peeled off (the length in the front-to-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the symbol X indicates the overall width of the diaper in an unfolded state.

[0024] This pants-type disposable diaper has a waist region T defined as the front-rear range having the side seals 12A (the front-rear range from the waist opening WO to the upper end of the leg openings LO), and an intermediate region L defined as the front-rear range of the portion forming the leg openings LO (between the front-rear region having the side seals 12A of the front body F and the front-rear region having the side seals 12A of the back body B). The waist region T can be conceptually divided into a waist portion W that forms the edge of the waist opening, and a lower waist portion U that is the portion below this. Normally, when there is a boundary within the waist region T where the stretch stress in the width direction WD changes (for example, where 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 closest to the waist opening WO, and when there is no such boundary, the waist extension portion extending toward the waist opening WO side from the absorber 56 or the inner body 200 is the waist portion W. These front-rear lengths vary depending on the size of the product and can be appropriately determined, but as an example, the waist portion W can be 20 to 40 mm, and the lower waist portion U can be 150 to 220 mm. Meanwhile, both side edges of the middle region L are narrowed to fit around the legs of the wearer, and these are the areas where the wearer's legs are inserted. As a result, the pants-type disposable diaper in the unfolded state has a roughly hourglass shape as a whole.

[0025] (Exterior body) The exterior bodies 12F, 12B are composed of a rectangular front exterior body 12F which is a portion that constitutes at least the waistline of the front body F, and a rear exterior body 12B which is a portion that constitutes at least the waistline of the back body B, and the front exterior body 12F and the rear exterior body 12B are not continuous on the crotch side, but are separated in the front-to-back direction LD (two-piece exterior type). The separation distance 12d in the front-to-back direction LD can be, for example, about 30 to 60% of the total length Y. In the illustrated example, the crotch side edge of the front exterior body 12F is straight along the width direction WD, and the crotch side edge 14 of the rear exterior body 12B is curved so as to extend toward the crotch side as it moves toward the center in the width direction WD; however, appropriate modifications are possible, such as the edges 14 of both the front exterior body 12F and the rear exterior body 12B being straight along the width direction WD (the front-to-rear direction LD dimensions of the front exterior body 12F and the rear exterior body 12B being the same) or the crotch side edges 14 of both the front exterior body 12F and the rear exterior body 12B being curved so as to extend toward the crotch side as it moves toward the center in the width direction WD.

[0026] Both side portions of the exterior bodies 12F, 12B in a range corresponding to the waist region T are joined to form side seals 12A, thereby forming an annular waist portion. Therefore, in the illustrated example, the rear exterior body 12B is formed with a buttocks covering portion C extending from the waist region T toward the middle region L, while the front exterior body 12F does not have a portion corresponding to 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.

[0027] As shown in Figs. 1, 2, 4, 6, etc., the exterior bodies 12F and 12B have an inner sheet layer 12H and an outer sheet layer 12S, and elastic members 15-17 provided between them. Each sheet layer can be a common sheet material or can be a separate sheet material. That is, in the former case, the elastic members 15-17 can be provided between the inner and outer parts of a sheet material folded back at an appropriate position such as the edge of the waist opening WO or the edge on the leg opening LO side in part or all of the front exterior body 12F and the rear exterior body 12B. In the illustrated example, the waist portion W has a portion including a folded back sheet material. For example, in the waist portion W, the sheet material forming the inner sheet layer 12H extends only to the edge of the waist opening WO, but the sheet material forming the outer sheet layer 12S goes around the edge of the waist opening side of the sheet material forming the second sheet layer and is folded back inward. Additionally, an innermost sheet layer 12C made of nonwoven fabric or the like is attached so as to cover the folded-back portion of the outer sheet layer 12S and the inside of the inner sheet layer, and this innermost sheet layer 12C extends to a position overlapping with the end portion on the waist opening WO side of the inner body 200. Although not shown, the folded-back portion of the outer sheet layer 12S may be extended to a position overlapping with the end portion on the waist opening WO side of the inner body 200 to form the innermost sheet layer, without providing a separate sheet for forming the innermost sheet layer 12C.

[0028] The waist-surrounding stretchable region (region having elastic members 15-17) is formed in the waist-surrounding portion of the exterior body 12F, 12B to improve the fit around the waist of the wearer, and elastic members 15-17 are built in the waist-surrounding portion to form a waist-surrounding stretchable region that stretches in the width direction WD with the elastic members 15-17. This waist-surrounding stretchable region is preferably provided over the entire front-to-back direction LD of the front exterior body 12F and the rear exterior body 12B, but some regions, such as the middle of the front-to-back direction LD, may be omitted. When in a natural length state, the waist-surrounding stretchable region contracts with the contraction of the elastic members 15-17, forming wrinkles or folds, and when stretched in the width direction WD, it can be stretched to a predetermined stretch rate that is fully stretched without wrinkles. As the elastic members 15-17, in addition to elongated elastic members such as rubber threads (illustrated example), known elastic members such as band-shaped, net-shaped, and film-shaped members can be used without any particular limitation. The elastic members 15 to 17 may be made of synthetic rubber such as spandex, or natural rubber.

[0029] To explain the elastic members 15-17 in the illustrated example in more detail, a plurality of waist elastic members 15 made of elongated elastic members are attached to the waist portion W of the outer bodies 12F, 12B at intervals in the front-rear direction LD so as to be continuous over the entire width direction WD. Of the waist elastic members 15, one or more arranged in the area adjacent to the waist lower portion U may overlap the inner body 200, or may be arranged on both sides of the width direction WD except for the width direction central portion overlapping with the inner body 200. The waist elastic members 15 are preferably about 5-10 pieces of rubber thread having a thickness of about 620-1240 dtex arranged at intervals of about 4-8 mm, and the stretch rate of the waist portion W in the width direction WD is preferably about 260-320%.

[0030] Additionally, multiple waist lower elastic members made of elongated elastic members are attached at intervals in the front-to-back direction LD to the waist lower portion U of the exterior bodies 12F, 12B. The waist lower elastic members 16 are preferably made of about 12 to 18 rubber threads having a thickness of about 310 to 940 dtex and spaced apart from each other in the front-to-back direction LD, and the resulting elongation rate of the waist lower portion U in the width direction WD is preferably about 200 to 280%.

[0031] Furthermore, when a buttocks-covering portion C is provided on the rear outer body 12B as in the illustrated example, or when a groin-covering portion is provided on the front outer body 12F (not illustrated), an elastic member 17 similar to that of the lower waist portion U can be provided, which allows the elongation rate in the width direction WD to be 200 to 280%, particularly 200 to 240%.

[0032] When elastic members 16, 17 are provided in the front-to-rear range having the absorbent body 56, as in the lower waist portion U in the illustrated example, it is preferable that the elastic members 16, 17 are continuous across the inner body 200, but in order to prevent contraction of the absorbent body 56 in the width direction WD in part or all of it, the middle widthwise portion (preferably including the entire inner fastening portion 201) including part or all of the portion overlapping with the absorbent body 56 in the width direction WD can also be made a non-stretchable region (not shown).

[0033] The sheet material forming the inner sheet layer 12H and the outer sheet layer 12S can be used without any particular limitation, but nonwoven fabric is preferable. When nonwoven fabric is used, the basis weight per sheet is 11 to 18 g / m 2 It is preferable to set the temperature to about 100°C.

[0034] The elastic members 15-17 are fixed to the exterior bodies 12F, 12B by hot melt adhesive HM applied by various application methods. The inner sheet layer 12H and the outer sheet layer 12S are preferably bonded by hot melt adhesive HM for fixing the elastic members 15-17 in the portions having the elastic members 15-17, respectively, and may be bonded by hot melt adhesive HM or material welding such as heat sealing or ultrasonic sealing in the portions not having the elastic members 15-17, or may not be bonded in part or in whole. In the illustrated example of the exterior bodies 12F, 12B, in the portions having the elastic members 15-17, the hot melt adhesive HM is applied only to the outer peripheral surfaces of the elastic members 15-17 by application means such as a comb gun or a surwrap nozzle, and the elastic members 15-17 are sandwiched between the sheet layers, so that the elastic members 15-17 are fixed to both sheet layers and both sheet layers are fixed only by the hot melt adhesive HM applied to the outer peripheral surfaces of the elastic members 15-17. The elastic members 15 to 17 may be fixed to both sheet layers only at both ends in the waist-surrounding stretching direction.

[0035] (Interior fixed part) The inner body 200 can be joined to the outer bodies 12F, 12B by a joining means such as heat sealing or ultrasonic sealing that uses material welding, or by a hot melt adhesive HM. The inner body fixing part 201 that joins the inner body 200 and the outer bodies 12F, 12B is preferably provided so as to include an area that spans both sides of the low rigidity region 202 in the width direction WD, as shown in FIG. 2. In this case, the inner body fixing part 201 includes an area that overlaps with the entire fallen portion 67 of the rising gather 60 and the entire fallen portion 67 of the other rising gather 60. For this reason, the inner body fixing part 201 can be provided in almost the entire area where the inner body 200 and the outer bodies 12F, 12B overlap, and can be provided, for example, in the entire area excluding both ends of the inner body 200 in the width direction WD.

[0036] (Interior body) The inner body 200 can have any shape, but in the illustrated example, it is substantially rectangular. As shown in Figs. 4 to 6 and 8, the inner body 200 is provided with a top sheet 30 forming an absorbent surface, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween, and performs an absorbing function. The front and rear ends of the inner body 200 are low-rigidity regions 202 that do not have an absorbent body 56. 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 from the sides of the inner body 200.

[0037] (Top sheet) The top sheet 30 is a material that is liquid permeable, and examples of such material include a perforated or non-perforated nonwoven fabric, and a perforated plastic sheet.

[0038] Both side portions of the top sheet 30 may be folded back at the side edges of the absorbent element 50 as in the illustrated example, or may protrude laterally beyond the side edges of the absorbent element 50 without being folded back.

[0039] The top sheet 30 is desirably fixed to an 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 HM, in order to prevent the top sheet 30 from shifting relative to the member on the rear side. In the illustrated example, the top sheet 30 is fixed to the surface of the absorbent element 50 by a hot melt adhesive HM applied to the rear surface thereof.

[0040] Although not shown, an intermediate sheet (also called a "second sheet") having a faster liquid permeability rate than the top sheet 30 can be provided between the top sheet 30 and the absorbent element 50 to prevent absorbed liquid from flowing back from the absorbent body 56.

[0041] (Liquid-impermeable sheet) The material of the liquid-impermeable sheet 11 is not particularly limited, but examples thereof include plastic films made of polyolefin resins such as polyethylene and polypropylene, laminated nonwoven fabrics in which a plastic film is provided on the surface of a nonwoven fabric, and laminated sheets in which a nonwoven fabric is laminated and bonded to a plastic film. It is preferable to use a liquid-impermeable and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness for the liquid-impermeable sheet 11. As a moisture-permeable plastic film, a microporous plastic film obtained by kneading an inorganic filler into a polyolefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching it in a uniaxial or biaxial direction is widely used. In addition, nonwoven fabrics using microdenier fibers, nonwoven fabrics whose leak-proofing properties have been enhanced by reducing the gaps in the fibers through the application of heat or pressure, and sheets that have been made liquid-impermeable without using a plastic film by methods such as coating with a highly absorbent resin or a hydrophobic resin or a water repellent agent 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 bonded to the cover nonwoven fabric 13 described below via a hot melt adhesive HM.

[0042] The liquid-impermeable sheet 11 may be of a width that fits within the back side of the absorbent element 50, with the remaining space being made up by other materials, or it may be arranged so that it extends beyond both sides of the width of the absorbent element 50, as in the illustrated example.

[0043] As long as the liquid-impermeable sheet 11 is located behind the absorbent element 50, it may be located behind the sheet that forms the rising gathers as in the illustrated example, or it may be located on the front side of the sheet that forms the rising gathers.

[0044] (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.

[0045] (Absorbent) The absorbent body 56 may be any known absorbent body, such as one formed from a fiber assembly, without any particular limitations. As the fiber assembly, in addition to stacked short 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 may also be used. As for the fiber basis weight, in the case of stacked pulp, it is, for example, 100 to 300 g / m 2 It can be about that.

[0046] The absorbent body 56 may be rectangular in shape, but as shown in Figure 8, 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 to the crotch area.

[0047] The dimensions of the absorbent body 56 can be determined as appropriate, but it is preferable that it extends from the position where it overlaps with the front exterior body 12F, through the crotch area, to the position where it overlaps with the rear exterior body 12B, and as shown in the illustrated example, it can extend to the peripheral edge of the interior body 200 or its vicinity in the front-rear direction LD and the width direction WD.

[0048] (Superabsorbent polymer particles) When the absorbent body 56 is formed of a fiber assembly, it is possible to disperse and contain superabsorbent polymer particles in a part or all of the absorbent body. The 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 preferable that the ratio 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 preferable that the ratio 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 of the particles that fall below the sieve.

[0049] 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.

[0050] The highly absorbent polymer particles preferably have a water absorption speed of 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 called backflow.

[0051] Moreover, the highly absorbent polymer particles preferably have a gel strength of at least 1000 Pa. This makes it possible to effectively prevent the sticky feeling after absorbing liquid, even when the absorbent body 56 is bulky.

[0052] 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 100 to 300 g / m 2 It can be said that:

[0053] (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, or the like. However, it is preferable that the sheet is one from which the superabsorbent polymer particles do not 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, a polyethylene / polypropylene composite, or the like. The basis weight of the wrapping sheet 58 is 5 to 40 g / m 2 , especially 10 to 30 g / m 2 It is preferable that the following be used.

[0054] The packaging structure 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 wound parts and the overlapping parts of the protruding front and rear parts by a joining means such as a hot melt adhesive HM or material welding.

[0055] (Rising Gathers) The rising gathers 60 have rising parts 68 that rise from the side of the inner body 200, and these rising parts 68 come into contact with the wearer's groin, around the legs, and to the buttocks to prevent side leakage. The rising parts 68 of the rising gathers 60 in the illustrated example extend only from the side edges of the inner body 200 to the center side in the width direction WD, but are not limited to this, and can be appropriately modified, such as being made up of a root side part that extends obliquely from the side edges of the inner body 200 toward the center side in the width direction WD, and a tip side part that extends obliquely from the tip of the root side part toward the outside in the width direction WD.

[0056] More specifically, the rising gathers 60 in the illustrated example are formed by folding back a band-shaped gathered sheet 62 having a length covering the entire front-rear direction LD of the inner body 200 in the width direction WD at a tip (end) portion and folding it in two, and fixing a plurality of elongated gather 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 (the end portion opposite the folded-back portion of the sheet in the width direction WD) of the rising gathers 60 located opposite the tip portion is made into a root portion 65 fixed to the back side of the absorbent body 56 over the entire front-rear direction of the inner body 200, and a portion extending from this root portion 65 is made into a main body portion 66 folded back to the front side of the inner body 200 at a position along the side edge of the absorbent body. The front and rear ends of the main body portion 66 form a fallen portion 67 which is fixed in a fallen state to the side surface of the top sheet 30, while the portion between them forms a non-fixed raised portion 68, and a gathered elastic member 63 extending along the front-to-rear direction LD is fixed in a stretched state to at least the tip of this raised portion 68.

[0057] In the rising gathers 60 configured as described above, the rising portion 68 rises up so as to come into contact with the skin as shown by the arrow in Fig. 5 due to the contraction force of the gather elastic member 63. The gather stretchable region GG to which the gather elastic member 63 is fixed in the rising portion 68 may cover the entirety of the rising portion 68 in the front-to-rear direction LD, but it is preferable that the region excludes the front and rear ends of the rising portion 68. In this case, the front and rear ends of the rising portion 68 do not have the gather elastic member 63, or have the gather elastic member 63 but are not fixed to the rising portion 68, and may contract to their natural length.

[0058] The opposing surfaces of the fallen portion 67 can be joined using a hot melt adhesive HM as in the illustrated example, or material welding such as heat sealing or ultrasonic sealing can be used in addition to or instead of the hot melt adhesive HM.

[0059] As the gathered sheet 62, a nonwoven fabric that is soft and has excellent uniformity and hiding properties, such as a spunbond nonwoven fabric (SS, SSS, etc.), an SMS nonwoven fabric (SMS, SSMMS, etc.), or a meltblown nonwoven fabric, and that is treated with silicone or the like to have a water repellent property as necessary, can be suitably used. In this case, the fiber basis weight of the nonwoven fabric is 10 to 30 g / m 2 It is preferable that the thickness of the gathered elastic member 63 is about 470 to 1240 dtex. For the gathered elastic member 63, rubber thread or the like can be used. When spandex rubber thread is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation of the gathered elastic member 63 in the attached state is preferably 150 to 350%, more preferably 200 to 300%. The number of gathered elastic members 63 is preferably 2 to 6, more preferably 3 to 5. The appropriate spacing between the gathered elastic members 63 is 3 to 10 mm. With this configuration, the gathered elastic members 63 can easily come into contact with the skin in a surface area within the range in which they are arranged. The gathered elastic members 63 may be arranged not only on the tip side but also on the root side.

[0060] In the rising portion 68 of the rising gather 60, at least one of hot melt adhesive HM 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 gather sheet 62 together and to fix the gather elastic member 63 sandwiched therebetween. Since bonding the entire surfaces of the inner layer and the outer layer of the gather sheet 62 together impairs flexibility, it is preferable that the parts other than the bonding parts of the gather elastic member 63 are not bonded or are weakly bonded. In the illustrated example, the hot melt adhesive HM is applied only to the outer peripheral surface of the gather elastic member 63 by an application means such as a comb gun or a surwrap nozzle, and the gather elastic member 63 is sandwiched between the inner layer and the outer layer of the gather sheet 62, so that the main body 66 has a structure in which the gather elastic member 63 is fixed to the inner layer and the outer layer of the gather sheet 62 and the inner layer and the outer layer of the gather sheet 62 are fixed only by the hot melt adhesive HM applied to the outer peripheral surface of the gather elastic member 63.

[0061] (Side flap) Side flaps 70 are provided on both sides of the inner body 200, extending laterally from the rising gathers 60. As shown in the illustrated example, each side flap 70 is preferably a flat portion extending only laterally without being folded back. The dimension of each side flap 70 in the width direction WD can be appropriately determined, but may be, for example, 0.1 to 0.2 times the dimension of the width direction WD of the inner body 200.

[0062] Each side flap 70 has a side stretchable region SG that stretches elastically in the front-rear direction LD at least in a portion between the portion overlapping with the front exterior body 12F and the portion overlapping with the rear exterior body 12B. The side stretchable region SG can be an area in which one or more elongated side elastic members 73 are attached along the front-rear direction LD and spaced apart from each other, contracting in the front-rear direction by the side elastic members 73 and being extensible in the front-rear direction. Furthermore, each side flap 70 preferably has a hollow portion (a portion in which adjacent layers in the thickness direction are not joined) continuing in the front-rear direction LD along its side edge. Contraction of the side elastic members 73 causes the portion of the side flap 70 including the hollow portion to contract in the front-rear direction LD, forming a side gather with many pleats aligned in the front-rear direction LD.

[0063] As shown in the illustrated example, the side flap 70 has a first sheet layer 71 forming the innermost surface and a second sheet layer 72 forming the outermost surface, and it is preferable that a side elastic member 73 is provided between them. The sheet material forming the first sheet layer 71 and the second sheet layer 72 is not particularly limited, and an appropriate nonwoven fabric such as a nonwoven fabric that can be used for the above-mentioned rising gather 60 or the above-mentioned exterior body 12F, 12B can be selected. In the illustrated example, the side flap 70 is constructed by adding a dedicated sheet material other than the rising gather 60, but the side flap 70 can also be constructed by extending the sheet that constitutes the rising gather 60. The front and rear ends of the side flap 70 may or may not coincide with the front and rear ends of the rising gather 60 (i.e., the front and rear ends of the interior body 200 in this case).

[0064] To explain the illustrated example in more detail, the liquid-impermeable sheet 11 arranged on the back side of the root portion 65 of the rising gathers 60 extends laterally beyond both side edges of the rising gathers 60, and a first sheet layer 71 joined to the front side of both side portions of this liquid-impermeable sheet 11 and a second sheet layer 72 joined to the back side extend laterally beyond both side edges of the liquid-impermeable sheet 11. In the illustrated example, the first sheet layer 71 and the second sheet layer 72 are formed of a single sheet folded back at the side edges of the side flaps 70. All of the side elastic members 73 may be provided at positions to the side of the liquid-impermeable sheet 11, but if, as in the illustrated example, the side elastic members 73 are provided at positions overlapping the liquid-impermeable sheet 11 and at positions to the side of the liquid-impermeable sheet 11, even if the contractile force of each side elastic member 73 in the unfolded state is the same, the portion of the side flap 70 to the side of the liquid-impermeable sheet 11 will contract more than the portion having the liquid-impermeable sheet 11, and the side flap 70 will also rise gently toward the rising gather 60, which is preferable.

[0065] The side elastic members 73 are not particularly limited either, and can be elongated elastic members similar to the above-mentioned gathered elastic members 63. The stretch rate of the side elastic members 73 in the side flaps 70 in the unfolded state is preferably 0.6 to 0.9 times the stretch rate of the rising gathers 60. The number of the side elastic members 73 is preferably less than that of the gathered elastic members 63 of the rising gathers 60, but may be the same or more. The arrangement interval of the side elastic members 73 in the width direction is not limited, and can be, for example, about 5 to 10 mm.

[0066] The side elastic member 73 is fixed to the first sheet layer 71 and the second sheet layer 72. For bonding the first sheet layer 71 and the second sheet layer 72 and for fixing the side elastic member 73 sandwiched therebetween, various application methods of hot melt adhesive HM or fixing means by material welding such as heat sealing or ultrasonic sealing can be used.

[0067] The fixing range of the side elastic member 73 in the front-rear direction LD, i.e., the range of the side stretchable region SG in the front-rear direction LD, is preferably from the part overlapping with the front exterior body 12F to the part overlapping with the rear exterior body 12B as shown in the illustrated example, but is not limited to this. Therefore, for example, the front end of the side stretchable region SG may be located at the rear end of the front exterior body 12F or further rearward. Similarly, the rear end of the side stretchable region SG may be located at the front end of the rear exterior body 12B or further forward. In addition, it is also preferable that the range of the side stretchable region SG in the front-rear direction LD is the same as the contraction portion of the gather elastic member 63 of the rising gather 60, or extends to both the front and rear sides.

[0068] The side elastic members 73 may be provided near the side edges of the side flaps 70 as in the illustrated example, but may not be provided in a certain section from the side edges to the center in the width direction WD.

[0069] (Non-woven cover) In the pants-type disposable diaper with two-part exterior, the inner body 200 is exposed between the front outer body 12F and the rear outer body 12B, so that the liquid-impermeable sheet 11 is not exposed on the back surface of the inner body 200, it is preferable to provide a cover nonwoven fabric 13 that forms the back surface of the inner body 200 so as to cover at least the liquid-impermeable sheet 11 from between the front outer body 12F and the inner body 200 to between the rear outer body 12B and the inner body 200. The inner and outer surfaces of the cover nonwoven fabric 13 can be bonded to the opposing surfaces via a hot melt adhesive HM. The nonwoven fabric used for the cover nonwoven fabric 13 can be appropriately selected from the same material as the outer bodies 12F and 12B, for example.

[0070] (Position of the folded part of the rising gathers and the positional relationship between the folded part and the absorbent body) As shown in Fig. 6 and Fig. 8 to Fig. 10, the edge 67i on the center side in the width direction WD of the rise-up gather 60 is located closer to the center in the width direction WD than the side edge 56e of the absorbent body 56, and is located only in the low-rigidity region 202. The boundary 67b of the fall-down portion 67 located only in the low-rigidity region 202 with the rise-up portion 68 is preferably located 0 to 15 mm, particularly 0 to 10 mm, and more preferably 0 to 5 mm from the edge of the waist opening WO side of the absorbent body 56 toward the waist opening WO. This distance is indicated by 67d in Fig. 8. When the fall-down portion 67 is fixed to the low-rigidity region 202 (i.e., closer to the waist opening WO side than the edge of the waist opening WO side of the absorbent body 56), the blocking range is expanded to the waist opening WO side from the absorbent body 56. However, since the fall-down portion 67 is located near the absorbent body 56 with high rigidity, the position and shape of the fall-down portion 67 are unlikely to change.

[0071] In particular, the low-rigidity region 202 (front end and rear end) of the inner body 200 is a region that is prone to gaps between the inner body 200 and the skin due to the difference in level with the portion having the absorbent body 56. Therefore, as in this example, if the waist lower elastic member 16 of the outer body 12F, 12B is provided so as to be continuous in the width direction WD across the region overlapping with the low-rigidity region 202 of the inner body 200, this portion that is prone to gaps is pressed toward the skin over the entire width direction WD, which is preferable from the viewpoint of leak prevention. However, if the inner body fixing part 201 is provided so as to include a region that extends over both sides of the low-rigidity region 202 in the width direction WD, and the fallen portion 67 is located in the low-rigidity region 202, the fallen portion 67 will also contract in the width direction WD due to the contraction force of the waist lower elastic member 16, not only in the natural length state but also in the worn state where it is stretched to a certain extent, and the width of the fallen portion 67 will narrow, which may reduce the width of the raised portion 68, i.e., the raised height. However, as described above, when the fallen portion 67 is positioned close to the absorbent body 56, the fallen portion 67 is less likely to deform the end portion on the waist opening WO side of the inner body 200 in the width direction WD, so gaps are less likely to occur in the low rigidity region 202 of the inner body 200, while the reduction in the rising height caused by the reduction in the width of the fallen portion 67 is also less.

[0072] In the illustrated example, the fallen portions 67 located only in the low stiffness region 202 are both the fallen portions 67 located on the front side of the inner body 200 and the fallen portions 67 located on the rear side of the inner body 200, but only one of the front or rear fallen portions 67 may be located only in the low stiffness region 202, and the other fallen portion 67 may extend not only within the low stiffness region 202 but also to the region overlapping with the absorbent body 56. In particular, it is also preferable that only the front fallen portion 67 is located only in the low stiffness region 202, and the rear fallen portion 67 extends not only within the low stiffness region 202 but also to the region overlapping with the absorbent body 56.

[0073] The shape of the fixing region 67F for fixing the fallen portion 67 can be an appropriate shape such as a square or a rectangle. The width of the fixing region 67F (the application width of the hot melt adhesive HM in the illustrated example) is preferably narrow when flexibility is important, but is preferably wide in order to stabilize the position and shape of the fallen portion 67, and is preferably 50% or more, particularly 90% or more, of the width 67w of the fallen portion 67. The width 67w of the fallen portion 67 is preferably 15 to 25 mm. In addition, it is preferable that the fixing region 67F of the fallen portion 67 continues to the base portion 65 in order to improve the blocking ability of excretory liquid that moves along the rising portion 68 toward the waist opening WO.

[0074] The rigidity of the absorbent body 56 is not particularly limited, but it is preferable for the torsional stiffness of a predetermined portion of the absorbent body 56, including the end portion on the waist opening WO side, to be 0.10 to 0.32 N·cm / cm in order to stabilize the position and shape of the collapsed portion 67 by the rigidity of the absorbent body 56.

[0075] In addition, as in this example, when the rising gathers 60 have a root portion 65 fixed to the inner body 200 on the back side of the absorbent body 56, and the main body portion 66 is a portion folded back from the root portion 65 to the front side of the inner body 200 at a position along the side edge of the absorbent body 56, it is preferable that the side portion of the portion of the rising gathers 60 from the folded back position to the back side of the absorbent body 56 is not joined to the member adjacent to the back side. In this non-joined region 67x, the contractile force of the waist elastic member 17 is not transmitted to the fallen portion 67, so that the decrease in the rising height caused by the decrease in the width of the fallen portion 67 is more reliably suppressed. The width of this non-joined region 67x is not particularly limited, but is preferably 50% or more, particularly 90% or more, of the width of the fixed region 67F of the fallen portion 67.

[0076] In addition, as in this example, when the outer body 12F, 12B has an innermost sheet layer 12C that covers the inner body 200 from the waist opening WO side to the part adjacent to the crotch side of the low stiffness region 202 with a width across both sides of the width direction WD of the inner body 200, the edge of the inner body 200 on the waist opening WO side can be covered, and the deterioration of the feel on the skin due to the edge can be prevented. In addition, the non-joined area of ​​the innermost sheet layer 12C also functions as a leakage prevention wall in the front-rear direction LD. However, when the innermost sheet layer 12C is fixed to the rising part 68, even if the rising part 68 is expanded toward the waist opening WO side by the above-mentioned structure, the movement of the rising part 68 is hindered by the innermost sheet layer 12C, and the fit of the rising gathers 60 is reduced. Therefore, in this case, it is preferable that the innermost sheet layer 12C has a joined area CA on the waist opening WO side where it is joined to a member adjacent to the back side, and a non-jointed area NC on the crotch side where it is not joined to a member adjacent to the back side, based on a virtual line VL in the width direction WD that passes through the fallen portion 67, because this allows the rise-up portion 68 to be expanded toward the waist opening WO side while preventing a decrease in the fit of the rise-up portion 68.

[0077] (Nonwoven fabric) As the nonwoven fabric in the above description, known nonwoven fabrics can be appropriately used depending on the part and purpose. The constituent fibers of the nonwoven fabric can be selected without particular limitation from synthetic fibers such as polyolefins such as polyethylene or polypropylene, polyesters, polyamides, etc. (including single-component fibers and composite fibers such as core-sheath fibers), regenerated fibers such as rayon and cupra, natural fibers such as cotton, etc., and these can also be used in combination. In order to increase the flexibility of the nonwoven fabric, it is preferable to use crimped fibers as the constituent 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 according to the length of the fibers, the sheet formation method, the fiber bonding method, and the laminated structure 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 (including SMS nonwoven fabrics and SMMS nonwoven fabrics in which a meltblown layer is sandwiched between spunbond layers), and the like, and any of these nonwoven fabrics can be used.

[0078] <Explanation of terms used in the specification> As used herein, the following terms have the following meanings unless otherwise specified in the specification.

[0079] 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.

[0080] "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.

[0081] "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.

[0082] "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.

[0083] "Maximum elongation rate" refers to the elongation rate when stretched to its elastic limit (in other words, the elongation rate when the stretchable area is flatly expanded without contraction or sagging).

[0084] "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).

[0085] - "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.

[0086] The "thickness" of thick members such as the absorber 56, the absorbent element 50, the bottom 51 of the groove, etc. is measured using a thickness gauge made by Ozaki Manufacturing Co., Ltd. (Peacock, dial thickness gauge, model H (measurement range 0 to 10 mm, measurement area circular terminal with diameter of 10 mm, measurement force approximately 1.7 N, pressure approximately 21.7 KPa)) with the sample and the thickness gauge held horizontally.

[0087] The "thickness" of thin sheets such as nonwoven fabrics was measured using an automatic thickness measuring device (KES-G5 Handy Compression Measurement Program) with a load of 0.098 N / cm 2 , and pressure area: 2cm 2 The measurement is performed automatically under the following conditions. "Torsion hardness" refers to the measured value obtained by the following test. In order to apply as little force as possible to the absorbent body, a section 60 mm in the front-to-back direction from the edge of the waist opening side of the absorbent body toward the crotch side was cut out with a width of 140 mm so that the absorbent body was positioned in the center in the width direction, and the entire section was wrapped in a single layer of crepe paper (15 g / m2 2 ) to prepare a specimen. Using a torsion testing machine (Kato Tech, KES-YN-1-B), both ends (10 mm) of the specimen in the width direction are gripped with chucks with a chuck distance of 110 mm, and the maximum load (torsion hardness) is measured when the specimen is twisted 70° around the central axis in the longitudinal direction. The test machine conditions are SENS (recording sensitivity): 10, torsion angle: 7, CONTROL: 7, and speed 12 cm / s. The test is performed on five specimens, and the average value is taken as the measured value of torsion hardness.

[0088] The water absorption is measured according to JIS K7223-1996 "Test method for water absorption of superabsorbent resins".

[0089] 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.

[0090] "Unfolded state" means a flat, unfolded state without contraction or sagging.

[0091] *Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not in the natural length state.

[0092] 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]

[0093] The present invention can be used in pants-type disposable diapers such as those in the above examples. [Explanation of symbols]

[0094] 11...liquid-impermeable sheet, 12A...side seal, 12B...rear exterior body, 12F...front exterior body, 12F, 12B...exterior body, 12C...innermost sheet layer, 12H...inner sheet layer, 12S...outer sheet layer, 13...cover nonwoven fabric, 15...waist elastic member, 16...waist lower elastic member, 17...elastic member, 200...interior body, 201...interior fixing part, 30...top sheet, 50...absorbent element, 56...absorbent body, 58...packaging sheet, 60...rise gather, 62...gather sheet, 63...gathered elastic member, 65...base portion, 66...main body portion, 67...falling down portion, 68...rise portion, 70...side flap, 71...first sheet layer, 72...second sheet layer, 73...side elastic member, F...front body portion, B...back body portion, L...middle region, LD...front to back direction, SG...side stretchable region, T...torso region, U...lower waist portion, W...waist portion, WD...width direction, WO...waist opening, LO...leg opening, HM...hot melt adhesive, 202...low rigidity region.

Claims

1. An integrated outer body extending from the front body to the back body, or an outer body provided separately on the front body and the back body; An inner body provided in the middle portion in the width direction so as to extend from the front body to the rear body; An absorbent body incorporated in the inner body so as to extend from the front body to the rear body; An interior fixing portion where the interior body is fixed to the exterior body; side seals in which both side portions of the exterior body of the front body and both side portions of the exterior body of the back body are joined together; A waist opening and a pair of left and right leg openings are provided, The inner body has risen gathers on both sides in the width direction thereof, the risen gathers extending over the entire front-rear direction of the inner body, The front end and the rear end of the inner body are low-rigidity regions that do not have the absorbent body, The rising gathers have a main body portion extending from a position along the side edge of the absorbent body in the inner body to the front side of the inner body, a fallen portion formed by fixing the front end and rear end of the main body portion to the surface of the inner body in a fallen state, a non-fixed rising portion located between the front and rear fallen portions, and a gather elastic member provided along the front-rear direction at least at the tip of the rising portion, At least one of the front and rear collapsed portions has an edge on the center side in the width direction located closer to the center side in the width direction than a side edge of the absorbent body, and is located only within the low stiffness region, the boundary between the fallen portion located only in the low stiffness region and the raised portion is located 0 to 15 mm toward the waist opening from the edge of the waist opening side of the absorbent body; A pants-type absorbent article characterized by:

2. The width of the fixed region of the fallen portion is 50% or more of the width of the fallen portion.

2. The pants-type absorbent article according to claim 1.

3. The torsional stiffness of a predetermined portion including the end portion on the waist opening side of the absorbent body is 0.10 to 0.32 N cm / cm.

3. A pants-type absorbent article according to claim 1 or 2.

4. The interior fixing portion is provided to include a region that spans both sides of the low rigidity region in a width direction, The outer body has a waist circumference elastic member that is continuous in the width direction across at least the region overlapping with the low rigidity region of the inner body in a waist circumference region defined as a front-rear direction range including the side seal, The portion of the outer cover having the waist elastic member is subjected to a contraction force by the waist elastic member in a natural length state.

3. A pants-type absorbent article according to claim 1 or 2.

5. The rising gathers have a root portion fixed to the inner body on the back side of the absorbent body, and the main body portion is a portion folded back from the root portion to the front side of the inner body at a position along a side edge of the absorbent body, The side portion of the portion of the rising gather from the folded-back position to the back side of the absorbent body is not joined to a member adjacent to the back side.

5. A pants-type absorbent article according to claim 4.

6. The outer body has an innermost sheet layer that covers a width of the inner body on both sides in the width direction from a waist opening side of the inner body to a portion adjacent to a crotch side of the low stiffness region, the innermost sheet layer has a waist opening side that is a joined region joined to a member adjacent to the back side, and a crotch side that is a non-jointed region that is not joined to a member adjacent to the back side, based on a virtual line in the width direction passing through the fallen portion; 3. A pants-type absorbent article according to claim 1 or 2.

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