Pants-type absorbent article

Abstract

Thus, both the enlargement of the partition range and the stability of the position and shape of the lodging part can be achieved. The problem is solved by a pant-type absorbent article in which the front end and the rear end of the interior body (200) are low-rigidity regions (202) that do not have an absorbent body (56), and the front end and the rear end of the interior body (200) are low-rigidity regions (202) that do not have an absorbent body (56). The edge of at least one of the front and rear lodging portions (67) of the standing pleats (60) on the center side in the width direction WD is positioned closer to the center side in the width direction WD than the side edge of the absorbent body (56), and the at least one of the front and rear lodging portions (67) of the standing pleats (60) is positioned only within the low-rigidity region (202). The boundary between the raised portion (68) and the lodging portion (67) located only in the low-rigidity region (202) is located at a position of 0-15 mm from the edge of the absorbent body (56) on the waist opening WO side toward the waist opening WO side.

Description

Technical Field

[0001] The present invention relates to a pant-type absorbent article having upright gathers. Background Art

[0002] Pants-type absorbent articles, such as disposable diapers, include an outer body that is integral with the front and back sections or is provided separately for the front and back sections; an inner body that is provided in the middle of the width direction, extending from the front to the back sections; an absorbent body that extends from the front to the back sections and is embedded in the inner body; and inner fixing portions that secure the inner body to the outer body. Side seals are formed by joining the two sides of the outer body in the front section and the two sides of the outer body in the back section, thereby forming a waist opening and a pair of left and right leg openings. Furthermore, elastic members are provided in the outer body in a waist region defined by the front-to-back range (the front-to-back range from the waist opening to the upper ends of the leg openings) to provide widthwise stretchability. Elastic members using elastic films, in addition to elongated elastic members such as rubber threads, are also known (see, for example, Patent Documents 1 and 2).

[0003] Furthermore, such a pants-type absorbent article has standing gathers extending along the entire front-to-back direction of the inner body on both sides of the inner body in the width direction. More specifically, the standing gathers comprise: a main body portion extending from a position along the side edges of the inner body to the front side of the inner body; a collapsed portion formed by securing both front-to-back ends of the main body portion to the inner body surface in a collapsed state; an unsecured standing portion located between the front and back collapsed portions; and a gathering elastic member provided along the front-to-back direction at least at the top end of each standing portion. In such standing gathers, the standing portions rise from the inner body surface by contracting together with the gathering elastic member, thereby blocking the lateral movement of excrement.

[0004] When the collapsed portion, which functions as a support for the upright portion, is located on the absorbent body and fixed to the absorbent body, as in the case of the upright pleats described in Patent Document 1, the portion with the absorbent body has a higher rigidity than the portion without the absorbent body. This makes it easier to stabilize the position and shape of the collapsed portion, thereby enabling the upright pleats to function appropriately. This is preferable. However, in this case, the upright portion is limited to the front-to-back direction of the absorbent body, which results in a limited barrier range.

[0005] On the other hand, as in the raised pleats described in Patent Document 2, when the inverted portion having the function of supporting the raised portion is fixed at a position laterally of the side edge of the absorbent body and closer to the waist opening side than the edge of the absorbent body on the waist opening side, the front-to-back dimension of the raised portion, that is, the partition range, is not limited by the front-to-back dimension of the absorbent body. However, since the fixed area of ​​the inverted portion is soft, it is difficult to stabilize the position and shape of the inverted portion, and thus, the raised pleats may not be able to function properly.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2019-118555

[0009] Patent Document 2: Japanese Patent Application Laid-Open No. 2022-36202 Summary of the Invention

[0010] Technical problem to be solved by the invention

[0011] Therefore, a main problem of the present invention is to achieve both expansion of the partition range of the standing gathers and stability of the position and shape of the collapsed portion.

[0012] Technical means to solve the problem

[0013] The pants-type absorbent article that has solved the above-mentioned problems is as follows.

[0014] <First option>

[0015] A shorts-type absorbent article, characterized in that it comprises: an outer body, wherein the outer body is an integral outer body extending from the front body portion to the back body portion or an outer body provided separately on the front body portion and the back body portion;

[0016] an inner body provided at a middle portion in the width direction from the front body portion to the back body portion;

[0017] an absorbent body built into the inner body from the front body portion to the back body portion;

[0018] an inner fixing portion, the inner fixing portion fixing the inner body to the outer body;

[0019] side seals formed by joining both side portions of the outer body of the front body portion and both side portions of the outer body of the back body portion; and

[0020] Waist opening and a pair of leg openings.

[0021] The inner body has standing pleats on both sides in the width direction thereof, extending throughout the entire front-back direction of the inner body.

[0022] The front end and the rear end of the inner body are low-rigidity areas without the absorbent body.

[0023] The standing pleats include: a main body extending from a position along the side edge of the absorbent body in the inner body to the surface of the inner body; a collapsed portion formed by fixing the front and rear ends of the main body to the surface of the inner body in a collapsed state; an unfixed standing portion located between the front and rear collapsed portions; and a pleated elastic member provided along the front-to-back direction at least at the top end of the standing portion.

[0024] The edge of the center side of the width direction of at least one of the front and rear collapsed portions is located closer to the center side of the width direction than the side edge of the absorbent body, and the at least one of the front and rear collapsed portions is located only in the low rigidity area.

[0025] The boundary between the collapsed portion located only in the low rigidity region and the raised portion is located at a position 0 to 15 mm from the edge of the absorbent body on the waist opening side toward the waist opening.

[0026] (Effect)

[0027] In the standing gathers of this shorts-type absorbent article, at least one of the front and rear collapsed portions, which function to support the standing portion, is fixed to a low-rigidity region (i.e., a region closer to the waist opening than the edge of the absorbent body). This extends the barrier area to the waist opening side of the absorbent body. Consequently, since the collapsed portion is positioned near the relatively rigid absorbent body, its position and shape are less likely to change.

[0028] <Second embodiment> The shorts-type absorbent article according to the first embodiment, wherein:

[0029] The width of the fixed area of ​​the prostrated portion is greater than 50% of the width of the prostrated portion.

[0030] (Effect)

[0031] In order to stabilize the position and shape of the collapsed portion, it is preferred that the width of the fixed region of the collapsed portion be within the range of this embodiment.

[0032] <Third embodiment> The shorts-type absorbent article according to the first or second embodiment, wherein:

[0033] The torsional hardness of a predetermined portion including an end portion of the absorbent body on the waist opening side is 0.10 to 0.32 N·cm / cm.

[0034] (Effect)

[0035] If the rigidity of the absorber is within the range of this aspect, it is preferable in that the position and shape of the collapsed portion can be stabilized by utilizing the rigidity of the absorber as described above.

[0036] <Fourth aspect> The shorts-type absorbent article according to any one of the first to third aspects, wherein:

[0037] The internal fixing portion is provided so as to include an area extending over both sides in the width direction of the low rigidity area.

[0038] The outer body has a waist elastic member in a waist region defined as a front-back range including the side seals, the waist elastic member extending across a region overlapping at least the low-rigidity region of the inner body and continuing in the width direction.

[0039] The portion of the outer body having the waist elastic members receives the contraction force generated by the waist elastic members in a state of natural length.

[0040] (Effect)

[0041] In the outer body of a pants-type absorbent article, stretchability in the width direction is generally increased by providing waist elastics in the waist region, defined as the front-to-back range where the side seals are located (the front-to-back range from the waist opening to the upper ends of the leg openings). The low-rigidity regions (front and rear ends) of the inner body are areas with a step between them and the absorbent body, and are prone to creating a gap between the skin and the waist. Therefore, if the waist elastics in the waist region of the outer body are arranged so as to cross the area overlapping the low-rigidity regions of the inner body, this area prone to creating a gap will be pressed toward the skin across the entire width, which is preferable from a leakage prevention perspective. However, if the inner fixing portion is arranged to encompass both sides of the low-rigidity region in the width direction, when the collapsed portion is located in the low-rigidity region, even when the collapsed portion is in a state of natural length and stretched to a certain extent, the collapsed portion will contract in the width direction due to the contractive force of the waist elastics. This narrowing of the collapsed portion may reduce the width of the raised portion, i.e., the raised height. However, as described above, when the collapsed portion is arranged near the absorbent body, the collapsed portion makes it difficult for the end portion of the inner body on the waist opening side to deform in the width direction. Therefore, it is difficult to produce a gap in the low rigidity area of ​​the inner body, and the reduction in the standing height caused by the reduction in the width of the collapsed portion is also small.

[0042] <Fifth Claim> The pants-type absorbent article according to the fourth claim, wherein:

[0043] The standing pleats have a root portion fixed to a position on the back side of the inner body relative to the absorbent body, and the main body portion is a portion folded back from the root portion toward the front side of the inner body at a position along the side edge of the absorbent body.

[0044] The side portions of the standing gathers that extend from the folded-back position to the back side of the absorbent body are not joined to a member adjacent to the back side thereof.

[0045] (Effect)

[0046] According to this embodiment, the contraction force of the waist elastic members is not transmitted to the collapsed portion in the non-joined region, and thus the reduction in the standing height due to the reduction in the width of the collapsed portion can be more reliably suppressed.

[0047] <Sixth aspect> The pants-type absorbent article according to any one of the first to fifth aspects, wherein:

[0048] The outer body has an innermost sheet layer extending over both sides of the inner body in the width direction, and the innermost sheet layer covers a portion of the low-rigidity region adjacent to the crotch side from a position closer to the waist opening than the inner body.

[0049] The innermost sheet has a joined region on the waist opening side joined to a member adjacent to the back side and a non-joined region on the crotch side not joined to a member adjacent to the back side, based on an imaginary line passing through the width direction of the collapsed portion.

[0050] (Effect)

[0051] By providing the innermost sheet as in this embodiment, the edge of the inner body on the waist opening side can be covered, thereby preventing the deterioration of the skin feel caused by this edge. In addition, the non-joined area of ​​the innermost sheet also functions as a leak-proof wall in the front-to-back direction. However, if the innermost sheet is fixed to the rising portion, even if the rising portion is expanded toward the waist opening using the above-mentioned structure, the movement of the rising portion will be hindered by the innermost sheet, and the fit of the rising pleats will be reduced. Therefore, it is preferable to configure as in this embodiment to expand the rising portion toward the waist opening and prevent the fit of the rising portion from being reduced.

[0052] Effects of the Invention

[0053] As described above, according to the present invention, it is possible to achieve advantages such as expansion of the partition range of the standing gathers and stability of the position and shape of the collapsed portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1This is a top view (inner surface side) of a pants-type disposable diaper in an unfolded state.

[0055] Figure 2 This is a top view (outer surface side) of a pants-type disposable diaper in an unfolded state.

[0056] Figure 3 It is a top view (inner surface side) showing the main part of the pants-type disposable diaper in the unfolded state.

[0057] Figure 4 yes Figure 1 1-1 cross-sectional view.

[0058] Figure 5 yes Figure 1 Sectional view 2-2.

[0059] Figure 6 yes Figure 1 Sectional view 3-3.

[0060] Figure 7 This is a perspective view of a pants-type disposable diaper in a worn state.

[0061] Figure 8 It is a top view of the inner body.

[0062] Figure 9 This is an enlarged plan view (inner surface side) showing a main portion of the front body in the expanded state.

[0063] Figure 10 It is a plan view (inner surface side) showing an enlarged view of the main part of the back body portion in the expanded state. DETAILED DESCRIPTION

[0064] An example of a shorts-type disposable diaper is described in detail below with reference to the accompanying drawings. The dot pattern in the cross-sectional view shows the adhesive HM used as a joining method for joining the various components located on the front and back sides. This adhesive can be applied by planar coating, droplet coating, curtain coating, wave coating, spiral coating, or pattern coating (transfer of hot melt adhesive using a relief printing method) of a hot melt adhesive. Alternatively, for the elastic component fixing portion, the adhesive can be applied to the outer peripheral surface of the elastic component using a coating gun, sizing coating, or other methods, in addition to or in addition to these coating methods. Examples of hot melt adhesives include EVA, adhesive rubber (elastomer), polyolefin, and polyester / polyamide types, but any of these can be used without particular limitation. Heat sealing, ultrasonic sealing, and other methods based on material fusion can also be used as a joining method for joining the various components.

[0065] Figures 1 to 7An example of a shorts-type disposable diaper is shown. This shorts-type disposable diaper includes: a rectangular front outer body 12F constituting at least the waistline of the front body portion F; a rear outer body 12B constituting at least the waistline of the rear body portion B; and an inner body 200 provided on the outer bodies 12F and 12B in a manner extending from the front outer body 12F through the crotch portion to the rear outer body 12B. The side seals 12A are formed by joining the two side portions of the front outer body 12F and the two side portions of the rear outer body 12B. Thus, the opening formed by the front and rear ends of the outer bodies 12F and 12B becomes a waist opening WO for the wearer's waist to pass through. On both sides of the inner body 200 in the width direction, the portions surrounded by the crotch-side edges 14 of the outer bodies 12F and 12B and the side edges of the inner body 200 become leg openings LO for the legs to pass through. The inner body 200 absorbs and retains urine and other excreta, while the outer bodies 12F and 12B support the inner body 200 relative to the wearer's body. Symbol Y indicates the total length of the diaper in its unfolded state (the length in the front-to-back direction from the edge of the waist opening WO of the front body portion F to the edge of the waist opening WO of the back body portion B) after the side seals 12A have been removed, and symbol X indicates the total width of the diaper in its unfolded state.

[0066] This shorts-type disposable diaper has a waist region T, defined as the front-to-back extent of the area containing the side seals 12A (the area extending from the waist opening WO to the upper ends of the leg openings LO), and a middle region L, defined as the area forming the leg openings LO (between the front-to-back extent of the front body portion F containing the side seals 12A and the front-to-back extent of the back body portion B containing the side seals 12A). The waist region T can be conceptually divided into a waist portion W, which forms the edge of the waist opening, and a lower waist portion U, which is the portion below the waist W. Typically, when there is a boundary within the waist region T where the elastic stress in the width direction WD varies (e.g., due to variations in the fineness or elongation of the elastic member), the waist region W is located closer to the waist opening WO than the boundary closest to the waist opening WO. When there is no such boundary, the waist portion that protrudes toward the waist opening WO, further than the absorbent body 56 or inner body 200, becomes the waist region W. Their lengths in the front-to-back direction vary depending on the product size and can be appropriately determined. However, as an example, the waist W can be set to 20-40 mm, and the lower waist portion U can be set to 150-220 mm. Meanwhile, the side edges of the middle region L are contracted to follow the wearer's leg circumference, forming the area where the wearer's legs are placed. As a result, the overall shape of the shorts-type disposable diaper in its unfolded state is roughly hourglass-shaped.

[0067] (outer body)

[0068] The outer garments 12F and 12B include a rectangular front outer garment 12F, which constitutes at least the waistline of the front body portion F, and a rear outer garment 12B, which constitutes at least the waistline of the rear body portion B. The front outer garment 12F and the rear outer garment 12B are not continuous at the crotch side but are separated in the front-to-back direction LD (a two-part outer garment). The separation distance 12d in the front-to-back direction LD can be, for example, approximately 30 to 60% of the total length Y. In the example shown in the figure, the edge 14 on the crotch side of the front outer body 12F is a straight line along the width direction WD, and the edge 14 on the crotch side of the rear outer body 12B is a curved line extending so as to be located on the crotch side as it moves toward the center of the width direction WD. However, the edges 14 of both the front outer body 12F and the rear outer body 12B can be straight lines along the width direction WD (the front and rear outer bodies 12F and 12B have the same dimensions in the front-to-back direction LD), or the edges 14 on the crotch side of both the front outer body 12F and the rear outer body 12B can be curved lines extending so as to be located on the crotch side as it moves toward the center of the width direction WD, and appropriate changes can be made.

[0069] The side seals 12A are formed by joining the two side portions of the outer bodies 12F and 12B corresponding to the waist region T, thereby forming an annular waist portion. Therefore, the rear outer body 12B shown in the figure is formed with a buttocks cover portion C extending from the waist region T toward the middle region L, while the front outer body 12F is not formed with a portion corresponding to the middle region L. Although not shown, the front outer body 12F may also be provided with a groin cover portion extending from the waist region T toward the middle region L.

[0070] like Figure 1 、 Figure 2 、 Figure 4 and Figure 6As shown in the figures, outer garments 12F, 12B have an inner sheet 12H, an outer sheet 12S and an elastic component 15~17 arranged therebetween. Each sheet can be set as an independent sheet in addition to being set as a common sheet. That is, in the case of the former, elastic components 15~17 can be set between the inner part and the outer part of a sheet that can be folded back at appropriate positions such as the edge of the waist opening WO, the edge of the leg opening LO side, etc. in the front outer garment 12F and the back outer garment 12B. In the example shown in the figure, the part that includes the folding back of sheet is provided at waist W. For example, in waist W, the sheet forming inner sheet 12H only extends to the edge of waist opening WO, but the sheet forming outer sheet 12S bypasses the edge of the waist opening side of the sheet forming the second layer and folds back to its inner side. Furthermore, an innermost sheet layer 12C made of a nonwoven fabric or the like is attached so as to cover the folded-back portion of the outer sheet layer 12S and the inner side of the inner sheet layer. 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 in the figures, it is also possible to form the innermost sheet layer by extending the folded-back portion of the outer sheet layer 12S to a position overlapping with the end portion on the waist opening WO side of the inner body 200 without providing a separate sheet for forming the innermost sheet layer 12C.

[0071] To improve fit around the wearer's waist, elastic members 15-17 are incorporated into the waist regions of the outer bodies 12F and 12B. These elastic waist regions (regions containing the elastic members 15-17) are formed to elastically expand and contract in the width direction WD as the elastic members 15-17 expand and contract. These elastic waist regions are preferably provided throughout the entire front and rear outer bodies 12F and 12B in the front-to-back direction LD, but may be omitted from a portion of the region, such as the center of the front-to-back direction LD. In their natural length, the elastic waist regions contract as the elastic members 15-17 contract, forming wrinkles or pleats. When extended in the width direction WD, they can be stretched to a predetermined elongation, allowing them to fully expand without wrinkling. The elastic members 15-17 can be formed in any of a variety of shapes, including those in the form of strips, nets, or films, in addition to elongated elastic members such as rubber threads (see example in the figure). Synthetic rubbers such as spandex and natural rubber can also be used for the elastic members 15-17.

[0072] Describing the elastic members 15-17 in more detail, a plurality of waist elastic members 15, each comprised of elongated elastic components, are attached to the waist region W of the outer bodies 12F and 12B, extending continuously throughout the width direction WD and spaced apart in the front-to-back direction LD. Furthermore, one or more of the waist elastic members 15 disposed in the region adjacent to the lower waist region U may overlap with the inner body 200 or, with the exception of the widthwise central region overlapping with the inner body 200, be disposed on both sides thereof in the width direction WD. The waist elastic members 15 are preferably composed of 5 to 10 rubber threads having a fineness of approximately 620 to 1240 dtex, spaced approximately 4 to 8 mm apart. The elongation of the waist region W thus formed in the width direction WD is preferably approximately 260 to 320%.

[0073] Furthermore, a plurality of elongated elastic members are attached to the lower waist portion U of the outer bodies 12F and 12B at intervals along the front-to-back direction LD. The lower waist elastic members 16 are preferably 12 to 18 rubber threads having a fineness of approximately 310 to 940 dtex, arranged at intervals of approximately 8 to 16 mm. The elongation of the lower waist portion U in the width direction WD formed thereby is preferably approximately 200% to 280%.

[0074] In addition, when a buttocks cover portion C is provided on the rear outer body 12B as shown in the example shown in the figure, or when a groin cover portion is provided on the front outer body 12F although not shown in the figure, an elastic component 17 similar to the lower waist portion U can be provided, and the elongation of the width direction WD formed thereby can be made 200~280%, in particular, 200~240%.

[0075] As in the lower waist area U shown in the example of the figure, when the elastic members 16 and 17 are provided in the front-to-back direction range having the absorbent body 56, it is preferred that the elastic members 16 and 17 are continuous across the inner body 200. However, in order to prevent part or all of the absorbent body 56 from shrinking in the width direction WD, the middle part in the width direction (preferably including the entire inner fixing part 201) including part or all of the portion overlapping with the absorbent body 56 in the width direction WD can also be set as a non-stretchable area (not shown).

[0076] The sheet material forming the inner sheet layer 12H and the outer sheet layer 12S can be used without particular limitation, but nonwoven fabric is preferred. When nonwoven fabric is used, the unit area weight of each sheet is preferably 11 to 18 g / m 2 about.

[0077] The elastic members 15-17 are secured to the outer bodies 12F and 12B using a hot melt adhesive HM applied by various coating methods. Preferably, the inner sheet 12H and the outer sheet 12S are joined at the portions having the elastic members 15-17 using a hot melt adhesive HM for securing the elastic members 15-17. Portions not having the elastic members 15-17 can be joined using a hot melt adhesive HM or by heat sealing, ultrasonic sealing, or by welding of materials, or by not bonding some or all of the elastic members. In the illustrated portions of the outer bodies 12F and 12B having the elastic members 15-17, a coating device such as a coating gun or gluing nozzle is used to apply hot melt adhesive HM only to the outer circumference of the elastic members 15-17, sandwiching the elastic members between the sheets. Thus, the hot melt adhesive HM applied only to the outer circumference of the elastic members 15-17 secures the elastic members 15-17 to the two sheets and to each other. The elastic members 15 to 17 may be fixed to the two sheet layers only at the two end portions in the waist expansion and contraction direction.

[0078] (Internal fixed part)

[0079] The inner body 200 can be joined to the outer bodies 12F and 12B by a joining method based on material welding such as heat sealing or ultrasonic sealing, or by a hot melt adhesive HM. Figure 2 As shown, the interior fixing portion 201 that joins the inner body 200 to the outer bodies 12F, 12B is preferably provided so as to encompass an area extending over both sides of the low-rigidity region 202 in the width direction WD. In this case, this includes an area that overlaps the entire collapsed portion 67 of the standing gather 60 and the entire collapsed portion 67 of the other standing gather 60. Therefore, the interior fixing portion 201 can be provided over substantially the entire overlapping region of the inner body 200 and the outer bodies 12F, 12B, for example, over the entire portion of the inner body 200 excluding both ends in the width direction WD.

[0080] (inner body)

[0081] The inner body 200 can be in any shape, but is in a substantially rectangular shape in the example shown. Figures 4 to 6 and Figure 8 As shown, the inner body 200 comprises a top sheet 30 forming an absorbent surface, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween, performing the absorption function. The front and rear ends of the inner body 200 are low-rigidity regions 202 lacking the absorbent core 56. Reference numeral 60 denotes standing gathers 60 extending from both sides of the inner body 200 to contact the wearer's legs to prevent side leakage of excrement.

[0082] (Top sheet)

[0083] The top sheet 30 has a liquid-permeable property and can be, for example, a porous or non-porous nonwoven fabric, a porous plastic sheet, or the like.

[0084] The side portions of the top sheet 30 may be folded back toward the back at the side edges of the absorbent element 50 as shown in the illustrated example, or may protrude laterally from the side edges of the absorbent element 50 without being folded back.

[0085] To prevent positional displacement of the backside components, the top sheet 30 is preferably secured to the backside components by a bonding method such as heat sealing or ultrasonic sealing based on material fusion or hot melt adhesive HM. In the illustrated example, the top sheet 30 is secured to the surface of the absorbent element 50 by hot melt adhesive HM applied to its backside.

[0086] Although not shown, in order to prevent the absorbed liquid from re-seeping from the absorber 56 , an intermediate sheet (also called a “second sheet”) having a liquid permeation rate faster than that of the top sheet 30 may be provided between the top sheet 30 and the absorbent element 50 .

[0087] (Liquid-impermeable sheet)

[0088] 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 with a plastic film provided on the surface of a nonwoven fabric, and laminated sheets with a nonwoven fabric superimposed and joined to a plastic film. For preventing stuffiness, the liquid-impermeable sheet 11 is preferably made of a material that is both liquid-impermeable and moisture-permeable. A widely used moisture-permeable plastic film is a microporous plastic film obtained by kneading an inorganic filler into a polyolefin resin such as polyethylene and polypropylene, forming the resulting sheet, and then stretching the resulting sheet in a uniaxial or biaxial direction. In addition, non-woven fabrics using ultra-fine denier fibers, non-woven fabrics whose fiber gaps are reduced by applying heat or pressure to enhance leak-proofness, and sheets made liquid-impermeable without using plastic films by coating with super absorbent resins, hydrophobic resins, or water repellents can also be used as the liquid-impermeable sheet 11. However, in order to obtain sufficient bonding strength when bonding with the covering non-woven fabric 13 described later via the hot-melt adhesive HM, it is preferable to use a resin film.

[0089] The liquid-impermeable sheet 11 may have a width sufficient to be accommodated on the back side of the absorbent element 50 and the remaining portion may be supplemented by other members, or may be provided to protrude to both sides in the width direction of the absorbent element 50 as shown in the example shown in the figures.

[0090] The liquid-impermeable sheet 11 only needs to be located on the back side of the absorbent element 50 and may be located on the back side of the sheet forming the standing gathers as in the illustrated example or on the front side of the sheet forming the standing gathers.

[0091] (Absorbing element)

[0092] The absorbent element 50 includes an absorbent body 56 and a wrapping sheet 58 that surrounds the entire absorbent body 56. The wrapping sheet 58 can also be omitted.

[0093] (Absorber)

[0094] The absorbent 56 can be any known absorbent such as an absorbent formed of a fiber aggregate without particular limitation. As the fiber aggregate, in addition to a fiber aggregate formed by stacking short fibers such as cotton pulp and synthetic fibers, a filament aggregate formed by opening a tow (fiber bundle) of synthetic fibers such as cellulose acetate as needed can also be used. The fiber basis weight can be, for example, 100 to 300 g / m2 when the pulp is stacked. 2 about.

[0095] The absorber 56 may also be rectangular in shape, but Figure 8 As shown in FIG. 1 , if the hourglass shape is formed with a narrowed portion 56N in the middle in the front-back direction and narrower in width than the front and back sides, the fit of the absorbent body 56 itself and the standing gathers 60 to the crotch is improved, which is preferable.

[0096] The size of the absorber 56 can be appropriately determined, but it preferably extends from a position overlapping with the front outer body 12F through the crotch portion to a position overlapping with the rear outer body 12B. As shown in the example in the figure, it can extend to or near the peripheral edge of the inner body 200 in the front-back direction LD and the width direction WD. Reference numeral 56X indicates the total width of the absorber 56.

[0097] (Superabsorbent polymer particles)

[0098] When the absorbent body 56 is formed from a fiber aggregate, superabsorbent polymer particles may be dispersed in part or all of the absorbent body. Superabsorbent polymer particles include not only "particles" but also "powders." Superabsorbent polymer particles used in disposable diapers can be used as they are. For example, preferably, the superabsorbent polymer particles should have a particle content of 30% or less when sieved (shaken for 5 minutes) through a 500 μm standard sieve (JIS Z8801-1:2006). Furthermore, of the particles that fall below the sieve, preferably, the particle content of 60% or more when sieved (shaken for 5 minutes) through a 180 μm standard sieve (JIS Z8801-1:2006) is retained.

[0099] The material for the superabsorbent polymer particles is not particularly limited, but preferably has a water absorption capacity of 40 g / g or greater. Examples of superabsorbent polymer particles include starch, cellulose, and synthetic polymers. Examples include starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, cross-linked sodium carboxymethylcellulose, and acrylic acid (salt) polymers. The superabsorbent polymer particles are preferably in the commonly used powder or granular form, but other forms are also possible.

[0100] As superabsorbent polymer particles, those with a water absorption rate of 70 seconds or less, particularly 40 seconds or less, can be suitably used. If the water absorption rate is too slow, so-called backwetting, i.e., liquid supplied to the absorbent body 56 flows back out of the absorbent body 56, is likely to occur.

[0101] As the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more can be suitably used. This effectively suppresses the sticky feeling after liquid absorption even when the absorbent body 56 is bulky.

[0102] The basis weight of the superabsorbent polymer particles can be appropriately determined according to the absorption amount required for the use of the absorbent body 56. Therefore, although it cannot be generalized, it can be set to 100 to 300 g / m 2 .

[0103] (Packaging sheet)

[0104] When using a wrapping sheet 58, its material can be tissue paper, particularly crepe paper, nonwoven fabric, polyethylene-laminated nonwoven fabric, or a sheet with small holes. Of these, a sheet that prevents the superabsorbent polymer particles from leaking is preferred. When using a nonwoven fabric instead of crepe paper, hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly preferred. Polypropylene, polyethylene / polypropylene composite materials, etc. can be used as the material. The weight per unit area of ​​the wrapping sheet 58 is preferably 5 to 40 g / m2. 2 , particularly preferably 10 to 30 g / m 2 .

[0105] The packaging structure of the packaging sheet 58 can be appropriately determined, but from the perspective of ease of manufacturing and prevention of leakage of highly absorbent polymer particles from the front and rear edges, it is preferred to roll the absorbent body 56 into a cylindrical shape in a manner that surrounds the front and back faces and both side faces, and to make the front and rear edges protrude from the front and rear of the absorbent body 56, and to join the overlapping portions of the rolled portions with the overlapping portions of the front and rear protruding portions by joining means such as hot melt adhesive HM and raw material welding.

[0106] (Stand-up pleats)

[0107] The standing gathers 60 have standing portions 68 that rise from the sides of the inner body 200. These standing portions 68 contact the wearer's groin, leg circumference, and hip area, preventing side leakage. In the illustrated example, the standing portions 68 of the standing gathers 60 extend only from the side edges of the inner body 200 toward the center in the width direction WD. However, this is not limiting. Alternatively, the standing portions 68 may be configured to include a base portion extending obliquely from the side edges of the inner body 200 toward the center in the width direction WD, and a tip portion extending obliquely from the tip of the base portion toward the outside in the width direction WD. This configuration is subject to modification as appropriate.

[0108] Describing in more detail, the standing gathers 60 shown in the illustration are formed by folding a strip-shaped pleated sheet 62, extending along the entire length of the inner body 200 in the front-to-back direction LD, back in half at the tip (end) portion in the width direction WD. Multiple elongated pleated elastic members 63, stretched in the longitudinal direction, are fixed between the folded portion and the adjacent sheet at intervals along the width direction WD. The base end of the standing gathers 60 (the end opposite the folded portion in the width direction WD) located opposite the tip end serves as a root portion 65, fixed to the rear side of the absorbent core 56 along the entire length of the inner body 200 in the front-to-back direction. The portion extending from this root portion 65 serves as a main body portion 66, folded back toward the front of the inner body 200 along the side edge of the absorbent core. Furthermore, the front and rear ends of the main body 66 are inverted portions 67 fixed to the side surfaces of the top sheet 30 in a inverted state, and on the other hand, the portion between them is an unfixed standing portion 68, and the pleated elastic component 63 along the front-to-back direction LD is fixed to at least the top end of the standing portion 68 in an extended state.

[0109] In the standing gathers 60 constructed as described above, the standing portions 68 are compressed by the contraction force of the gather elastic members 63. Figure 5 The pleated elastic member 63 is fixed to the raised portion 68 so as to contact the skin. The pleated elastic region GG of the raised portion 68, to which the pleated elastic member 63 is fixed, may extend over the entire front-to-back direction LD of the raised portion 68, but preferably extends to the region excluding the front and rear ends of the raised portion 68. In this case, the front and rear ends of the raised portion 68 may not have the pleated elastic member 63, or, although the pleated elastic member 63 is present, it is not fixed to the raised portion 68 and is contracted to its natural length.

[0110] In joining the facing surfaces of the collapsed portion 67 , in addition to using the hot melt adhesive HM as shown in the example, material welding such as heat sealing or ultrasonic sealing may be used together with or instead of the hot melt adhesive HM.

[0111] As the pleated sheet 62, a pleated sheet that has been treated with silicone or the like to give a soft, uniform, and concealing nonwoven fabric such as spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), or meltblown nonwoven fabric, which has been treated to be water-repellent, as needed, can be appropriately used. In this case, the fiber basis weight of the nonwoven fabric is preferably 10 to 30 g / m2. 2 About. As the pleated elastic component 63, a rubber thread or the like can be used. When using a spandex rubber thread, the fineness is preferably 470~1240 dtex, more preferably 620~940 dtex. The elongation of the pleated elastic component 63 in the installed state is preferably 150~350%, more preferably 200~300%. The number of pleated elastic components 63 is preferably 2~6, more preferably 3~5. It is appropriate that the arrangement interval of the pleated elastic components 63 is 3~10 mm. If constructed in this way, it is easy to contact the skin with the surface within the range where the pleated elastic component 63 is arranged. It is also possible that the pleated elastic component 63 is arranged not only on the top side but also on the root side.

[0112] At the raised portions 68 of the raised pleats 60, the inner and outer layers of the pleated sheet 62 are bonded together, and the pleated elastic members 63 sandwiched therebetween are secured. At least one of hot melt adhesives HM applied using various coating methods and fixing methods such as heat sealing or ultrasonic sealing, which involve welding of raw materials, can be used. Bonding the entire inner and outer layers of the pleated sheet 62 together would impair flexibility. Therefore, it is preferred that the pleated elastic members 63 be left unbonded or weakly bonded to any portion other than the bonded portion. In the illustrated example, a coating component such as a coating gun or a gluing nozzle is used to coat the hot melt adhesive HM only on the outer peripheral surface of the pleated elastic component 63, and the hot melt adhesive HM is sandwiched between the inner layer and the outer layer of the pleated sheet 62, thereby forming a structure in the main body 66, that is, the pleated elastic component 63 is fixed to the inner layer and the outer layer of the pleated sheet 62 and the inner layer and the outer layer of the pleated sheet 62 are fixed to each other only by using the hot melt adhesive HM coated on the outer peripheral surface of the pleated elastic component 63.

[0113] (flank)

[0114] Side flaps 70 are provided on both sides of the inner body 200, extending laterally from the standing gathers 60. As shown in the illustrated example, each side flap 70 is preferably a flat portion that simply extends laterally without being folded back. The dimension of each side flap 70 in the width direction WD can be determined as appropriate, but can be, for example, 0.1 to 0.2 times the width direction WD dimension of the inner body 200.

[0115] Each side flap 70 also has a side stretch region SG that elastically stretches and contracts in the front-to-back direction LD, at least in the portion between the portion overlapping the front exterior body 12F and the portion overlapping the back exterior body 12B. The side stretch region SG can be defined as a region in which one or more elongated side elastic members 73 are attached at intervals along the front-to-back direction LD, contracting in the front-to-back direction due to the side elastic members 73 while also being able to expand in the front-to-back direction. Furthermore, each side flap 70 preferably has a hollow portion along its side edge that is continuous in the front-to-back direction LD (adjacent layers in the thickness direction are not joined). Contraction of the side elastic members 73 causes the portion of the side flap 70 containing the hollow portion to contract in the front-to-back direction LD, forming side gathers with a plurality of pleats arranged in the front-to-back direction LD.

[0116] As shown in the illustrated example, the side flaps 70 preferably include a first sheet 71 forming the innermost surface and a second sheet 72 forming the outermost surface, with side elastic members 73 interposed therebetween. The sheet materials forming the first and second sheet layers 71, 72 are not particularly limited; any suitable nonwoven fabric, such as a nonwoven fabric that can be used in the aforementioned standing gathers 60 and the aforementioned outer bodies 12F and 12B, can be selected. In the illustrated example, the side flaps 70 are constructed by adding a dedicated sheet separate from the standing gathers 60. However, the side flaps 70 can also be constructed by extending the sheet that constitutes the standing gathers 60. The front and rear ends of the side flaps 70 may or may not coincide with the front and rear ends of the standing gathers 60 (i.e., in this case, the front and rear ends of the inner body 200).

[0117] To explain the illustrated example in more detail, the liquid-impermeable sheet 11, which is positioned on the back side of the base 65 of the standing gathers 60, extends laterally relative to the side edges of the standing gathers 60. The first sheet layer 71, which is joined to the front side of the two side portions of the liquid-impermeable sheet 11, and the second sheet layer 72, which is joined to the back side, extend laterally relative to the 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 from a single sheet folded back at the side edges of the side flaps 70. All the side elastic members 73 may be provided at positions laterally of the liquid-impermeable sheet 11. However, as shown in the example of the figure, if the side elastic members 73 are provided respectively at positions overlapping with the liquid-impermeable sheet 11 and at positions laterally of the liquid-impermeable sheet 11, then even if the contractile forces of the side elastic members 73 in the unfolded state are the same, the portions of the side flaps 70 laterally of the liquid-impermeable sheet 11 will contract more than the portions having the liquid-impermeable sheet 11, and the side flaps 70 will rise smoothly toward the standing pleats 60. This is therefore preferred.

[0118] The side elastic members 73 are also not particularly limited, but elongated elastic members similar to the aforementioned gather elastic members 63 can be used. The elongation of the side elastic members 73 in the side flaps 70 in the expanded state is preferably 0.6 to 0.9 times the elongation of the standing gathers 60. Furthermore, the number of side elastic members 73 is preferably less than the number of gather elastic members 63 in the standing gathers 60, but may be the same or greater. The spacing between the side elastic members 73 in the width direction is not limited, but can be, for example, approximately 5 to 10 mm.

[0119] The side elastic members 73 are fixed to the first sheet layer 71 and the second sheet layer 72. For the bonding of the first sheet layer 71 and the second sheet layer 72 and the fixing of the side elastic members 73 sandwiched therebetween, fixing means by welding raw materials such as hot melt adhesives HM applied by various coating methods, heat sealing, and ultrasonic sealing can be used.

[0120] As shown in the example, the fixed range of the side elastic members 73 in the front-to-back direction LD, i.e., the range of the side stretch zone SG in the front-to-back direction LD, preferably extends from the portion overlapping the front exterior body 12F to the portion overlapping the rear exterior body 12B, but is not limited thereto. Thus, for example, the front end of the side stretch zone SG may be located at the rear end of the front exterior body 12F, or further rearward than the rear end of the front exterior body 12F. Similarly, the rear end of the side stretch zone SG may be located at the front end of the rear exterior body 12B, or further forward than the front end of the rear exterior body 12B. Furthermore, it is also preferable that the range of the side stretch zone SG in the front-to-back direction LD be the same as the contracted portion of the gather elastic members 63 formed by the standing gathers 60, or extend forward and backward beyond this contracted portion.

[0121] 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 the left and right sections located on the center side in the width direction WD from the side edges.

[0122] (covered with non-woven fabric)

[0123] In a two-part outer garment, a shorts-type disposable diaper is provided, in which the inner body 200 is exposed between the front outer body 12F and the rear outer body 12B. Therefore, in order to prevent the liquid-impermeable sheet 11 from being exposed on the back side of the inner body 200, a covering nonwoven fabric 13 is preferably provided. This covering nonwoven fabric 13 forms the back side of the inner body 200, covering at least the liquid-impermeable sheet 11 from between the front outer body 12F and the inner body 200 and between the rear outer body 12B and the inner body 200. The inner and outer surfaces of the covering nonwoven fabric 13 can be bonded to the opposing surfaces via a hot-melt adhesive HM. The nonwoven fabric used for the covering nonwoven fabric 13 can be appropriately selected from the same material as that used for the outer bodies 12F and 12B, for example.

[0124] (Position of the collapsed portion of the standing pleats and the positional relationship between the collapsed portion and the absorbent core)

[0125] like Figure 6 、 Figures 8 to 10 As shown, it is preferred that the edge 67i of the collapsed portion 67 of the standing pleat 60 on the central side in the width direction WD is located closer to the central side in the width direction WD than the side edge 56e of the absorbent body 56, and the collapsed portion 67 of the standing pleat 60 is located only in the low rigidity region 202, and the boundary 67b between the collapsed portion 67 and the rising portion 68 located only in the low rigidity region 202 is located at a position 0 to 15 mm from the edge on the waist opening WO side of the absorbent body 56, particularly at a position 0 to 10 mm, and may also be at a position 0 to 5 mm. This distance is determined by Figure 8 As shown by the reference numeral 67d in the figure. When the collapsed portion 67 is fixed to the low-rigidity region 202 (i.e., the region closer to the waist opening WO than the edge of the absorbent core 56 on the waist opening WO side), the blocking range is expanded to a position closer to the waist opening WO than the absorbent core 56. Thus, since the collapsed portion 67 is positioned near the absorbent core 56, which has relatively high rigidity, the position and shape of the collapsed portion 67 are less likely to change.

[0126] In particular, the low-rigidity region 202 (front and rear ends) of the inner body 200 has a step between it and the portion containing the absorbent core 56, and is prone to creating a gap between the body and the skin. Therefore, if the waist elastic members 16 of the outer bodies 12F and 12B are arranged so as to extend across the region overlapping the low-rigidity region 202 of the inner body 200 and continue in the width direction WD, as in this example, this region, where this gap is likely to occur, is pressed toward the skin throughout the entire width direction WD. This is preferable from the perspective of leak prevention. However, if the inner fixing portion 201 is arranged to encompass the region extending along both sides of the low-rigidity region 202 in the width direction WD, when the collapsed portion 67 is located in the low-rigidity region 202, even when the collapsed portion 67 is in the low-rigidity region 202 and is stretched to a certain extent, the collapsed portion 67 will contract in the width direction WD due to the contraction force of the waist elastic members 16. This narrowing of the collapsed portion 67 may reduce the width, or the standing height, of the standing portion 68. However, as described above, when the collapsed portion 67 is arranged near the absorbent body 56, the collapsed portion 67 makes it difficult for the end portion of the inner body 200 on the waist opening WO side to deform in the width direction WD. Therefore, it is difficult to generate a gap in the low rigidity area 202 of the inner body 200, and the reduction in the standing height caused by the reduction in the width of the collapsed portion 67 is also small.

[0127] In the illustrated example, the collapsed portions 67 located only within the low-rigidity region 202 are both the collapsed portions 67 located on the front side of the inner body 200 and the collapsed portions 67 located on the rear side of the inner body 200. However, it is also possible that only one of the front and rear collapsed portions 67 is located within the low-rigidity region 202, while the other collapsed portion 67 is not only located within the low-rigidity region 202 but also extends to the region overlapping with the absorbent body 56. In particular, it is also preferable that only the front collapsed portion 67 is located within the low-rigidity region 202, while the rear collapsed portion 67 is not only located within the low-rigidity region 202 but also extends to the region overlapping with the absorbent body 56.

[0128] The fixing area 67F used to secure the collapsed portion 67 can be any suitable shape, such as a square or rectangle. The width of the fixing area 67F (in the illustrated example, the width of the hot-melt adhesive HM applied) is preferably narrow when flexibility is important. However, to stabilize the position and shape of the collapsed portion 67, it is preferably wider, for example, at least 50% of the width 67w of the collapsed portion 67, and particularly preferably at least 90%. The width 67w of the collapsed portion 67 is preferably 15 to 25 mm. Furthermore, to improve the barrier effect against excrement flowing toward the waist opening WO along the rising portion 68, the fixing area 67F of the collapsed portion 67 is preferably continuous to the base 65.

[0129] The rigidity of the absorber 56 is not particularly limited, but when the torsional hardness of a predetermined portion including the end portion on the waist opening WO side of the absorber 56 is 0.10~0.32N‧cm / cm, it is preferred to utilize the rigidity of the absorber 56 to stabilize the position and shape of the collapsed portion 67.

[0130] Furthermore, as in this example, the standing gathers 60 preferably have a root portion 65 fixed to the inner body 200 at a position further back than the absorbent core 56. The main portion 66 is a portion folded back from the root portion 65 toward the front side of the inner body 200 at a position along the side edge of the absorbent core 56. In this case, the side portions of the standing gathers 60 extending from the folded-back position to the back side of the absorbent core 56 are not joined to the adjacent member on the back side. In this non-joined region 67x, the contractive force of the waist elastic member 17 is not transmitted to the collapsed portion 67, thereby more reliably suppressing a reduction in the standing height caused by a reduction in the width of the collapsed portion 67. The width of this non-joined region 67x is not particularly limited, but is preferably at least 50% of the width of the fixed region 67F of the collapsed portion 67, and particularly preferably at least 90%.

[0131] Furthermore, as in this example, when the outer body 12F, 12B has an innermost sheet 12C that covers the portion adjacent to the crotch side from the position closer to the waist opening WO than the inner body 200 to the low rigidity region 202, with a width extending across both sides of the inner body 200 in the width direction WD, the edge of the inner body 200 on the waist opening WO side can be covered, thereby preventing the deterioration of the skin feel caused by this edge. In addition, the non-joined area of ​​the innermost sheet 12C also functions as a leak-proof wall in the front-to-back direction LD. However, if the innermost sheet 12C is fixed to the rising portion 68, even if the rising portion 68 is expanded toward the waist opening WO side using the above-mentioned structure, the movement of the rising portion 68 will be hindered by the innermost sheet 12C, and the fit of the rising pleats 60 will be reduced. Therefore, in this case, when the innermost surface layer 12C is formed with a joining area CA on the waist opening WO side joined to the component adjacent to the back side and a non-joining area NC on the crotch side not joined to the component adjacent to the back side based on the imaginary line VL in the width direction WD passing through the collapsed portion 67, the standing portion 68 can be expanded toward the waist opening WO side and the reduction in the fit of the standing portion 68 can be prevented, which is preferred.

[0132] (non-woven fabric)

[0133] As the non-woven fabric in the above description, known non-woven fabrics can be appropriately used according to the location or purpose. As the constituent fibers of the non-woven fabric, for example, in addition to synthetic fibers such as polyolefins such as polyethylene or polypropylene, polyesters, and polyamides (in addition to single-component fibers, also including composite fibers such as core-sheath), regenerated fibers such as rayon or cuprammonium fibers, natural fibers such as cotton, etc. can be selected without particular limitation, and they can also be mixed and used. In order to improve the softness of the non-woven fabric, it is preferred that the constituent fibers be crimped fibers. In addition, the constituent fibers of the non-woven fabric can be either hydrophilic fibers (including fibers made hydrophilic by using a hydrophilic agent), hydrophobic fibers, or water-repellent fibers (including fibers made water-repellent by using a water-repellent agent). In addition, nonwoven fabrics are generally classified into short-fiber nonwoven fabrics, long-fiber nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, thermal bond (hot air) nonwoven fabrics, needle-punched nonwoven fabrics, point-bonded nonwoven fabrics, and laminated nonwoven fabrics (including SMS nonwoven fabrics and SMMS nonwoven fabrics in which a meltblown layer is sandwiched between spunbond layers), etc., according to the fiber length, sheet forming method, fiber bonding method, and laminate structure, but any of these nonwoven fabrics can be used.

[0134] <Explanation of terms in this manual>

[0135] Unless otherwise specified in the specification, the following terms in the specification have the following meanings.

[0136] The "front-back direction" refers to the direction indicated by the symbol LD in the figure (longitudinal direction), and the "width direction" refers to the direction indicated by WD in the figure (left-right direction). The front-back direction and the width direction are perpendicular to each other.

[0137] ‧ The “front side” refers to the side of a shorts-type disposable diaper that is closest to the wearer’s skin when the diaper is worn, and the “back side” refers to the side of a shorts-type disposable diaper that is farther from the wearer’s skin when the diaper is worn.

[0138] ‧ “Top surface” refers to the side of a component that is closer to the wearer’s skin when the pants-type disposable diaper is worn, and “back surface” refers to the side that is farther from the wearer’s skin when the pants-type disposable diaper is worn.

[0139] ‧ "Elongation" refers to the value when the natural length is set to 100%. For example, an elongation of 200% is the same as an elongation of 2 times.

[0140] ‧ “Maximum elongation” refers to the elongation when stretched to the elastic limit (in other words, the elongation in the stretched state where the stretchable area is stretched flat without shrinking or relaxing).

[0141] Gel strength was measured as follows: 1.0 g of superabsorbent polymer was added to 49.0 g of artificial urine (a mixture of 2 wt% urea, 0.8 wt% sodium chloride, 0.03 wt% calcium chloride dihydrate, 0.08 wt% magnesium sulfate heptahydrate, and 97.09 wt% ion-exchanged water) and stirred with a stirrer. The resulting gel was placed in a constant temperature and humidity chamber at 40°C and 60% RH for 3 hours. After returning to room temperature, the gel strength was measured using a curdmeter (Curdmeter-MAX ME-500, manufactured by I.techno Engineering).

[0142] "Weight per unit area" is measured as follows. After pre-drying the sample or test piece, place it in a test chamber or apparatus under standard conditions (test location: temperature 23 ± 1°C, relative humidity 50 ± 2%) until it reaches a constant weight. Pre-drying means allowing the sample or test piece to reach a constant weight in an environment at a temperature of 100°C. Pre-drying is not required for fibers with a standard moisture regain of 0.0%. Using a sample collection template (100 mm × 100 mm), cut a 100 mm × 100 mm sample from the constant weight test piece. Measure the sample weight and multiply it by 100 to calculate the weight per square meter. This weight is used as the weight per unit area.

[0143] The thickness of thicker components such as the absorber 56, the absorbing element 50, and the groove bottom 51 was measured using a thickness gauge (PEACOCK, dial thickness gauge, model H (measuring range 0-10 mm, measuring area with a round terminal of 10 mm diameter, measuring force approximately 1.7 N, pressure approximately 21.7 kPa)) manufactured by Ozaki Seisakusho Co., Ltd., with the sample and the gauge level.

[0144] ‧ The thickness of thin sheets such as non-woven fabrics is measured using an automatic thickness gauge (KES-G5 portable compression measurement program) at a load of 0.098 N / cm 2 And pressurized area: 2 cm 2 Automatic measurement under the conditions of

[0145] ‧ "Torsional hardness" refers to the value measured based on the following test. In order to minimize the application of force to the absorber, a 60 mm front-to-back section of the absorber from the waist opening side edge to the crotch side was cut out with a width of 140 mm so that the absorber is located in the center of the width direction. A layer of crepe paper (weight per unit area 15 g / m2) was used to hold the absorber in place. 2 ) to create a specimen. Using a torsion testing machine (KES-YN-1-B, manufactured by Kado Technology Co., Ltd.), the specimen's widthwise ends (10 mm) were grasped with chucks spaced 110 mm apart. The maximum load (torsional hardness) when twisted 70° around the longitudinal center axis was measured. The testing machine conditions were: SENS (recording sensitivity): 10, torsion angle: 7, CONTROL: 7, and speed: 12 cm / s. Five specimens were tested, and the average value was used as the torsional hardness value.

[0146] ‧ The water absorption capacity is measured according to JIS K7223-1996 "Test method for water absorption of super absorbent resins".

[0147] ‧ The water absorption rate is the time to the endpoint when testing with 2 g of superabsorbent polymer and 50 g of physiological saline according to JIS K7223-1996 "Test method for water absorption rate of superabsorbent polymers".

[0148] ‧ “Expanded state” refers to a state in which the device is flatly extended without being shrunk or relaxed.

[0149] ‧ Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not the dimensions in the natural length state.

[0150] ‧ In the absence of any description of the environmental conditions during testing or measurement, it is assumed that the testing or measurement was conducted in a test room or device under standard conditions (test location: temperature 23 ± 1°C, relative humidity 50 ± 2%).

[0151] Industrial Applicability

[0152] The present invention can be applied to the underpants-type disposable diapers as in the above-mentioned examples.

[0153] Description of Reference Numerals

[0154] 11...Liquid-impermeable sheet, 12A...Side seal, 12B...Rear exterior body, 12F...Front exterior body, 12F, 12B...Exterior body, 12C...Innermost sheet, 12H...Inner sheet, 12S...Outer sheet, 13...Covering nonwoven fabric, 15...Waist elastic, 16...Lower waist elastic, 17...Elastic, 200...Inner body, 201...Inner fixing portion, 30...Top sheet, 50...Absorbent element, 56...Absorbent body, 58...Wrapping sheet, 60...Rising pleats, 62... Pleated sheet, 63…pleated elastic component, 65…root, 66…main body, 67…fallen down part, 68…standing up part, 70…side wings, 71…first sheet layer, 72…second sheet layer, 73…side elastic component, F…front body part, B…back body part, L…middle area, LD…front-back direction, SG…side stretch area, T…waist area, U…lower part of waist, W…waist, WD…width direction, WO…waist opening, LO…leg opening, HM…hot melt adhesive, 202…low rigidity area.

Claims

1. A shorts-type absorbent article, characterized in that: include: An outer body, wherein the outer body is an integral outer body from the front body portion to the back body portion or an outer body provided on the front body portion and the back body portion respectively; an inner body provided at a middle portion in the width direction from the front body portion to the back body portion; an absorbent body built into the inner body from the front body portion to the back body portion; an inner fixing portion, the inner fixing portion fixing the inner body to the outer body; side seals formed by joining both side portions of the outer body of the front body portion and both side portions of the outer body of the back body portion; and Waist opening and a pair of leg openings. The inner body has standing pleats on both sides in the width direction thereof, extending throughout the entire front-back direction of the inner body. The front end and the rear end of the inner body are low-rigidity areas without the absorbent body. The standing pleats include: a main body portion extending from a position along the side edge of the absorbent body in the inner body to the surface of the inner body; and a collapsed portion formed by fixing the front and rear ends of the main body portion to the surface of the inner body in a collapsed state. an unfixed upright portion, the unfixed upright portion being located between the front and rear lodging portions; and a gather elastic member provided at least at a top end of the standing portion along the front-back direction, The edge of the center side of the width direction of at least one of the front and rear collapsed portions is located closer to the center side of the width direction than the side edge of the absorbent body, and the at least one of the front and rear collapsed portions is located only in the low rigidity area. The boundary between the collapsed portion located only in the low rigidity region and the raised portion is located at a position 0 to 15 mm from the edge of the absorbent body on the waist opening side toward the waist opening.

2. The shorts-type absorbent article according to claim 1, wherein The width of the fixed area of ​​the prostrated portion is greater than 50% of the width of the prostrated portion.

3. The shorts-type absorbent article according to claim 1 or 2, characterized in that The torsional hardness of a predetermined portion including an end portion of the absorbent body on the waist opening side is 0.10 to 0.32 N·cm / cm.

4. The shorts-type absorbent article according to claim 1 or 2, characterized in that The internal fixing portion is provided so as to include an area extending over both sides in the width direction of the low rigidity area. The outer body has a waist elastic member in a waist region defined as a front-back range including the side seals, the waist elastic member extending across a region overlapping at least the low-rigidity region of the inner body and continuing in the width direction. The portion of the outer body having the waist elastic members receives the contraction force generated by the waist elastic members in a state of natural length.

5. The shorts-type absorbent article according to claim 4, wherein The standing pleats have a root portion fixed to a position on the back side of the inner body relative to the absorbent body, and the main body portion is a portion folded back from the root portion toward the front side of the inner body at a position along the side edge of the absorbent body. The side portions of the standing gathers that extend from the folded-back position to the back side of the absorbent body are not joined to a member adjacent to the back side thereof.

6. The shorts-type absorbent article according to claim 1 or 2, characterized in that The outer body has an innermost sheet layer extending over both sides of the inner body in the width direction, and the innermost sheet layer covers a portion of the low-rigidity region adjacent to the crotch side from a position closer to the waist opening than the inner body. The innermost sheet has a joined region on the waist opening side joined to a member adjacent to the back side and a non-joined region on the crotch side not joined to a member adjacent to the back side, based on an imaginary line passing through the width direction of the collapsed portion.

Images