Disposable diapers

Abstract

To provide a disposable diaper with improved fitness.SOLUTION: A disposable diaper includes a crotch part C, an abdominal side part F extending from the crotch part C to a front side, a back side part B extending from the crotch part C to a back side, and a fastening tape 12 which is provided on both side parts of the back side part B and extends outward in a width direction WD. The fastening tape 12 includes a back side expanding and contracting member 13B which is provided on a back side BS, extends outward in the width direction WD, and expands and contracts in the width direction WD, a crotch side expanding and contracting member 13C which is provided on a crotch side CS, extends outward in the width direction WD, and expands and contracts in the width direction WD, and a bridge member 5 which bridges between the back side expanding and contracting member 13B and the crotch side expanding and contracting member 13C and is fastened on an outer surface of the abdominal side part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a disposable diaper in which fastening tapes provided on both sides of the back portion of the diaper are fastened to the outer surface of the ventral portion of the diaper. [Background technology]

[0002] Conventionally, commercially available tape-type disposable diapers generally have a fastening base sheet protruding outward on both sides of the back of the diaper, and fastening tapes protruding outward from the fastening base sheet. In order to fit the diaper closely to the body, most diapers have two fastening base sheets and two fastening tapes in the front and back directions on both sides of the back of the diaper.

[0003] The method of putting on these commercially available tape-type disposable diapers can be decided by the wearer at will, but the following two methods are the most common.

[0004] The first method is the "normal fastening" method, in which the two fastening tapes, upper and lower, are fastened to the outer surface of the abdominal part of the diaper in a roughly parallel state. This method is often seen when the wearer is of average build or obese.

[0005] The second method of wearing the diaper is the "cross fastening" method, in which the two fastening tapes on the top and bottom are crossed over each other to fasten the diaper to the outside of the abdominal part of the diaper. This method of wearing the diaper is often seen when the wearer is thin.

[0006] When the "normal fastening" is used, the disposable diaper does not fit closely to the wearer's body, and there is a possibility that the disposable diaper may slip off due to gravity while being worn. In addition, a gap is likely to form between the disposable diaper and the wearer's back (especially near the wearer's spine), which may cause urine and other bodily fluids to leak out from the gap (so-called "back leakage"). In order to prevent such problems, cross fastening is recommended even when the wearer is of normal build or obese.

[0007] On the other hand, in addition to the tape-type disposable diapers, pants-type disposable diapers are also commercially available. These pants-type disposable diapers are generally provided with an outer body constituting at least the waist-circumference portion of the front body and the waist-circumference portion of the rear body, and an inner body including an absorbent attached to the inner surface of the outer body so as to extend from the front body to the rear body, and the side edges of the outer body of the front body and the side edges of the outer body of the rear body are welded to form side seal portions, forming a waist opening and a pair of left and right leg openings. In recent years, some pants-type disposable diapers have been provided with fastening tapes on both sides of the rear body, and the fastening tapes are fastened to the outer surface of the front body to improve the fit of the diaper.

[0008] The following inventions are related to the present invention. The tape-type disposable diaper disclosed in Patent Document 1 is configured to be put on by fastening tapes provided on both sides of the back side to be fastened to the outer surface of the abdominal side, and the fastening tapes have tape attachment parts fixed to both sides of the back side and a tape main body part protruding from the tape attachment parts, and the tape main body part has a plurality of hook materials having a large number of fastening pins on its surface arranged in parallel in the width direction, or a hook material connector which can be divided into a plurality of hook materials in the width direction is provided, and at least the portions between the hook materials in the tape main body part are elastically stretchable portions which stretch in the width direction.

[0009] Patent Document 1 discloses the following effects. When the fastening tape of the diaper of Patent Document 1 is pulled by pinching the tip, the elastic part stretches and the interval between the hook members widens, so that the hook members can be engaged with the abdominal outer surface with the interval widened. Therefore, the area of ​​each hook member can be reduced while maintaining the overall engagement area, so that the hard wearing feeling caused by the hook members can be reduced without compromising the engagement force. In particular, since the parts between the hook members are elastic, each hook member bites deeper and more firmly into the abdominal outer surface, unlike a case where multiple hook members are simply provided, and the engagement force is actually very high. Furthermore, since the parts between the hook members are flexible elastic parts, the ability to follow the unevenness of the body surface is significantly improved, unlike a case where multiple hook members are simply provided, and the hook members can follow twists and bends well, for example.

[0010] The worn article disclosed in Patent Document 2 has a vertical direction extending from the abdominal portion through the crotch portion to the dorsal portion and a width direction perpendicular thereto, and comprises an article main body and an overhanging portion arranged on both widthwise edges of at least one of the abdominal portion and dorsal portion, the overhanging portion comprising a sheet member, a plurality of elastic members and a plurality of thread-like members, the plurality of elastic members and thread-like members both extending outward in the width direction and disposed on the sheet member, the elastic members being disposed in a stretched state and being contractible when released from the stretched state.

[0011] Patent Document 2 discloses the following effects. The wearable article of Patent Document 2 has an excellent effect of preventing pressure on the stomach area due to changes in posture while wearing the article, by giving appropriate elasticity to the overhanging parts, and also preventing the article from being pulled too tight when put on. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] JP 2013-074974 A [Patent Document 2] JP 2012-016456 A Summary of the Invention [Problem to be solved by the invention]

[0013] In order to improve the fit of the diaper, it is preferable to deform the fastening tape when fastening it to the outer surface of the abdominal part of the diaper. For example, when performing cross fastening, the fastening tape is also deformed diagonally downward (or diagonally upward) while fastening, which can further improve the fit. Also, when performing normal fastening, by making the fastening tape easier to stretch laterally, the wearer will stretch the fastening tape more strongly in the lateral direction, which can result in improved fit.

[0014] The tape body (the portion where the fastening tape is arranged) of the disposable diaper disclosed in Patent Document 1 has an elastic portion between the hook materials that elastically expands and contracts in the width direction. However, because the tape body is made of a single sheet, there is a natural limit to the direction and amount of deformation, which limits how well the diaper can be fitted.

[0015] The fastening tape portion of the wearing article disclosed in Patent Document 2 does not deform at all, so there is a limit to how well the diaper can be improved in fit.

[0016] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, a primary object of the present invention is to provide a disposable diaper with improved fitting. [Means for solving the problem]

[0017] The present invention, which has solved the above problems, is as follows. (First aspect) A crotch portion, a ventral portion extending forward from the crotch portion, and a dorsal portion extending backward from the crotch portion, and fastening tapes provided on both sides of the back portion and extending outward in the width direction, The fastening tape is A back side stretchable member provided on the back side and extending outward in the width direction, capable of stretching in the width direction; A crotch side stretchable member provided on the crotch side and extending outward in the width direction, the crotch side stretchable member being stretchable in the width direction; A bridging member that bridges between the back side elastic member and the crotch side elastic member and can be attached to the outer surface of the abdominal side portion. A disposable diaper characterized by:

[0018] (Action and effect) The disposable diaper of this embodiment is provided with a fastening tape having a back-side elastic member, a crotch-side elastic member, and a bridging member bridging between these members. Since the tape body is not in the form of a single sheet as in Patent Document 1, the fastening tape is easily deformed when fastening the fastening tape to the outer surface of the abdominal part of the diaper. Therefore, when cross fastening is performed, the fastening tape part can be fastened while being deformed diagonally downward (or diagonally upward), which can improve the fit compared to the diapers of Patent Documents 1 and 2. Also, when performing normal fastening, the fastening tape part can be easily stretched in the lateral direction, which can improve the fit compared to the diapers of Patent Documents 1 and 2.

[0019] (Second aspect) The bridging member is A plurality of bridging elements are provided adjacent to each other in the width direction, In product condition, There is no gap between adjacent bridging components; In a state where the fastening tape is stretched outward in the width direction, The disposable diaper according to the first embodiment, wherein a gap is formed between adjacent bridging components.

[0020] (Action and effect) In the disposable diaper of this embodiment, when the fastening tape is stretched outward in the width direction, gaps are formed between adjacent bridging components. When the tape body is in the form of a single sheet as in Patent Document 1, such gaps are not formed, but by adopting a structure in which such gaps are formed, the back-side elastic member and the crotch-side elastic member are easily deformed, and the fit of the diaper can be improved.

[0021] (Third aspect) The bridging member is A plurality of bridging elements are provided adjacent to each other in the width direction, In product state, A gap is provided between adjacent bridging components, In a state where the fastening tape is stretched outward in the width direction, The disposable diaper according to the first embodiment, wherein the gap provided between adjacent bridging components is enlarged.

[0022] (Action and effect) In the disposable diaper of this embodiment, in the finished product state, a gap is provided between adjacent bridging components, and further, when the fastening tape is stretched outward in the width direction, the gap between adjacent bridging components becomes larger, so that the fastening tape is more easily deformed than in the second embodiment, and the fit of the diaper can be improved.

[0023] (Fourth aspect) The fastening tape is A back fastening tape provided on the back side; A crotch-side fastening tape is provided on the crotch side, In the dorsal fastening tape, The disposable diaper according to any one of the first to third aspects, wherein the back-side elastic member is more easily stretched outward than the crotch-side elastic member.

[0024] (Action and effect) In the disposable diaper of this embodiment, the rear elastic member of the rear fastening tape is more easily stretched outward than the crotch elastic member, which makes it easier for the rear fastening tape to deform diagonally downward, thereby improving the fit of the diaper.

[0025] (Fifth aspect) In the dorsal fastening tape, The back side elastic member and the bridging member are bonded to each other, and the crotch side elastic member and the bridging member are bonded to each other, The disposable diaper according to the fourth aspect, wherein an adhesion area between the back elastic member and the bridging member is smaller than an adhesion area between the crotch elastic member and the bridging member.

[0026] (Action and effect) In the disposable diaper of this embodiment, the bonding area between the back-side elastic member and the bridging member in the back-side fastening tape is smaller than the bonding area between the crotch-side elastic member and the bridging member, so that the back-side fastening tape is easily deformed diagonally downward, and the fit of the diaper can be improved.

[0027] (Sixth aspect) In the dorsal fastening tape, The disposable diaper according to the fourth or fifth embodiment, wherein an overlapping area between the back elastic member and the bridging member is smaller than an overlapping area between the crotch elastic member and the bridging member.

[0028] (Action and effect) In the disposable diaper of this embodiment, the overlapping area of ​​the back-side elastic member and the bridging member in the back-side fastening tape is smaller than the overlapping area of ​​the crotch-side elastic member and the bridging member, which makes it easier for the back-side fastening tape to deform obliquely downward, thereby improving the fit of the diaper.

[0029] (Seventh aspect) The fastening tape is A back fastening tape provided on the back side; A crotch-side fastening tape is provided on the crotch side, In the crotch-side fastening tape, The disposable diaper according to any one of the first to third aspects, wherein the crotch side elastic member is more easily stretched outward than the back side elastic member.

[0030] (Action and effect) In the disposable diaper of this embodiment, the crotch-side elastic member of the crotch-side fastening tape is more easily stretched outward than the back-side elastic member, so that the crotch-side fastening tape is more easily deformed obliquely upward, and the fit of the diaper can be improved.

[0031] (Eighth aspect) In the crotch-side fastening tape, The back side elastic member and the bridging member are bonded to each other, and the crotch side elastic member and the bridging member are bonded to each other, The disposable diaper according to the seventh aspect, wherein the bonding area between the crotch side elastic member and the bridging member is smaller than the bonding area between the back side elastic member and the bridging member.

[0032] (Action and effect) In the disposable diaper of this embodiment, the bonding area between the crotch-side elastic member and the bridging member in the crotch-side fastening tape is smaller than the bonding area between the back-side elastic member and the bridging member, which makes it easier for the crotch-side fastening tape to deform obliquely upward, thereby improving the fit of the diaper.

[0033] (Ninth aspect) In the crotch-side fastening tape, The disposable diaper according to the seventh or eighth embodiment, wherein an overlapping area between the crotch side elastic member and the bridging member is smaller than an overlapping area between the back side elastic member and the bridging member.

[0034] (Action and effect) In the disposable diaper of this embodiment, the overlapping area of ​​the crotch-side elastic member and the bridging member in the crotch-side fastening tape is smaller than the overlapping area of ​​the back-side elastic member and the bridging member, which makes it easier for the crotch-side fastening tape to deform obliquely upward, thereby improving the fit of the diaper. Effect of the Invention

[0035] As described above, according to the present invention, a disposable diaper with improved fitting can be provided. [Brief description of the drawings]

[0036] [Figure 1] 1 is a plan view of a diaper (in a finished state) according to embodiment A of the present invention as viewed from the inner side, where the left and right sides in the width direction refer to the left and right sides when viewed from the back side to the ventral side. [Diagram 2] FIG. 1 is a plan view of a diaper (in a manufactured state) according to embodiment A of the present invention, viewed from the back side. [Diagram 3] 2 is a cross-sectional view taken along line XX in FIG. 1. [Figure 4] 2 is a cross-sectional view taken along line YY in FIG. 1. [Diagram 5] 5A is an enlarged view of the fastening tape located in the upper right of Fig. 1. FIG. 5B is a view showing the fastening tape of 5A pulled outward in the width direction. [Figure 6] 6A is a plan view of FIG. 5A from the rear side, and FIG. 6B is a plan view of FIG. 5B from the rear side. [Figure 7] 7A is a plan view showing a state in which a fastening tape is fastened to a front target tape provided on the outer surface of the abdominal part, and FIG. 7B is a cross-sectional view taken along line PP of FIG. [Figure 8] 8A is an enlarged view of the fastening tape of the diaper (in a finished state) according to embodiment B of the present invention, as viewed from the inner side. The fastening tape portion is the same as that of FIG. 1. (8B) is a view showing the state in which the fastening tape of (8A) is pulled outward in the width direction. [Figure 9]9A is an enlarged view of the fastening tape of the diaper (in a finished state) according to embodiment C of the present invention, as viewed from the inner side. The fastening tape portion is the same as that of FIG. 1. (9B) is a view showing the state in which the fastening tape of (9A) is pulled outward in the width direction. [Figure 10] 1 is an enlarged view of a fastening tape when a diaper (in a manufactured state) according to embodiment D of the present invention is viewed from the inner side, and is the same as FIG. [Figure 11] 1 is an enlarged view of a fastening tape when a diaper (in a manufactured state) of embodiment C according to the present invention is viewed from the inner side, and is the same as FIG. [Figure 12] (12A) is a plan view of the main part when the elastic member is pulled to the maximum in the width direction. (12B) is a cross-sectional view of (12A). (12C) is a cross-sectional view of the elastic member when it is slightly pulled in the width direction. (12D) is a cross-sectional view of the elastic member in its natural length state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, when the disposable diaper according to the present invention is laid out, the side closest to the wearer's skin is referred to as the "inner surface," and the side furthest from the wearer's skin is referred to as the "outer surface." Also, the side closest to the wearer is referred to as the "inner surface side," and the side furthest from the wearer is referred to as the "outer surface side."

[0038] (100 disposable tape-type diapers) Figures 1 and 2 show an example 100 of a tape-type disposable diaper according to the present invention. This disposable diaper 100 has an absorbent body 3 interposed between a back sheet 1 located on the reverse side and a liquid-permeable top sheet 2 that comes into contact with the skin.

[0039] The crotch area C refers to the area that corresponds to the crotch of the body when in use, and in most products, it is the center in the front-to-back direction or the area in front of or near that. Specifically, in the case of disposable diapers for adults, it is within a range of ±150 mm from the center in the front-to-back direction of the product. Also, the ventral area (front area) F refers to the area in front of the crotch area C, and the dorsal area (rear area) B refers to the area behind the crotch area C.

[0040] (Top sheet 2) The top sheet 2 extends outward from the periphery of the absorbent body 3, and the portion extending outward from the side edge of the absorbent body 3 is fixed to the back sheet 1 with a hot melt adhesive or the like. The top sheet 2 may be a nonwoven fabric with or without holes, a plastic sheet with holes, or the like. The material fibers constituting the nonwoven fabric may include synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and amides, as well as regenerated fibers such as rayon or cupra, and natural fibers such as cotton. The fiber basis weight of the nonwoven fabric used for the top sheet 2 is 15 to 30 g / m 2 and the thickness is preferably 0.05 to 1 mm.

[0041] (Absorbent 3) The absorbent body 3 may be a pulp fiber stack, a filament aggregate such as cellulose acetate, or a nonwoven fabric, with a high absorbent polymer mixed or fixed as necessary. If necessary, the absorbent body 3 may be wrapped in crepe paper CP. The shape of the absorbent body 3 may be appropriately determined, but in addition to the hourglass shape shown in the figure, a shape extending from the front to the back of the crotch area, such as a rectangle, is preferable. The pulp basis weight of the absorbent body 3 is 100 to 500 g / m 2 The desired thickness is about 1 to 15 mm. The weight of the highly absorbent resin is 0 to 300 g / m 2 If the content of the superabsorbent resin is too low, sufficient absorbency cannot be imparted, whereas if the content is too high, the pulp fibers will not be entangled, and twisting and cracking will occur easily.

[0042] (Liquid-impermeable sheet 15) A liquid-impermeable sheet 15 is provided on the outside of the absorbent body 3 so as to protrude slightly beyond the periphery of the absorbent body 3. This liquid-impermeable sheet 15 blocks the movement of excrement absorbed in the absorbent body 3 to the back side. As the liquid-impermeable sheet 15, in addition to a plastic film such as a polyethylene film, a sheet having moisture permeability without impairing water-proofing properties can also be used to prevent stuffiness. As the water-proof and moisture-permeable sheet, for example, a microporous sheet obtained by melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet and then stretching the sheet in a uniaxial or biaxial direction can be used. The weight per unit area of ​​the back sheet 1 is 10 to 40 g / m 2 and the thickness is preferably 0.01 to 0.1 mm.

[0043] (Back seat 1) The outer surface of the liquid-impermeable sheet 15 is covered with a back sheet 1 made of nonwoven fabric, and this back sheet 1 protrudes outward from the peripheral edge of the liquid-impermeable sheet 15 with a predetermined protrusion width. Various nonwoven fabrics can be used as the back sheet 1. As the material fiber constituting the nonwoven fabric, synthetic fibers such as olefin-based fibers such as polyethylene or polypropylene, polyester-based fibers, amide-based fibers, regenerated fibers such as rayon or cupra, and natural fibers such as cotton can be used.

[0044] (Second seat) Although not shown, a second sheet may be provided on the inner surface of the absorbent 3 to prevent urine or the like from flowing back. The width of the second sheet may be set so that the absorbent 3 partially protrudes from the side edge of the second sheet, or the width of the second sheet may be widened so that the side edge of the absorbent 3 does not protrude. As the second sheet, a nonwoven fabric with or without holes, a plastic sheet with holes, or the like is used. As the material fiber constituting the nonwoven fabric, in addition to synthetic fibers such as olefin-based fibers such as polyethylene or polypropylene, polyester-based fibers, amide-based fibers, and the like, regenerated fibers such as rayon or cupra, and natural fibers such as cotton can be used.

[0045] The outer widthwise portions of the barrier sheet 4 are attached to both sides of the inner surface of the diaper 100 (the surfaces of the exterior sheet 12 extending laterally from the side edge surfaces of the top sheet 2 in the illustrated embodiment) over the entire front-rear direction. The barrier sheet 4 may be made of various nonwoven fabrics (preferably a spunbond nonwoven fabric), plastic films similar to those used in the back sheet 1, or laminated sheets thereof, but in terms of feel to the skin, a nonwoven fabric that has been subjected to a water-repellent treatment is preferred. The widthwise center portion of the barrier sheet 4 is fixed to the inner surface of the article (the surface of the top sheet 2 in the illustrated embodiment) at both front-rear ends by a hot melt adhesive or the like, but the intermediate portion between them is an unfixed free portion, and a standing elastic stretchable member 4G that contributes to the standing of the barrier sheet is fixed in a stretched state along the front-rear direction by a hot melt adhesive or the like to the tip end of this free portion (the end on the widthwise center side in the unfolded state). The upright elastic stretchable member 4G (as well as other upright elastic stretchable members and elongated elastic stretchable members) may be made of commonly used materials such as styrene-based rubber, olefin-based rubber, urethane-based rubber, ester-based rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, etc., formed into thread, string, or strip shape. This free portion constitutes a barrier that stands against the inner surface of the article (the surface of the top sheet 2 in the illustrated embodiment) as a result of the contraction force of the upright elastic stretchable member 4G. The base end of this standing portion is located at the boundary between the fixed portion on the outer side in the width direction and the inner portion of the barrier sheet 4. The barrier formed by the contraction of the upright elastic stretchable member 4G is called a three-dimensional gather 40, and the barrier sheet 4 that constitutes this three-dimensional gather 40 is also called a gather sheet.

[0046] (End flap part EF) At both ends in the front-to-rear direction LD of the disposable diaper 100, the back sheet 1, exterior sheet 12, liquid-permeable top sheet 2 and barrier sheet 4 extend to both the front and rear sides of the front and rear ends of the absorbent body 3, respectively, to form end flap portions EF where the absorbent body 3 is not present.

[0047] (Front Target Tape 6) A front target tape 6 is provided along the width direction on the abdominal surface of the diaper. The diaper is worn on the body by fastening fastening means 5, which will be described later, to the front target tape 6.

[0048] (Side flap part SF) On both the left and right sides of the disposable diaper 100, the back sheet 1, exterior sheet 12, liquid-permeable top sheet 2 and barrier sheet 4 each extend laterally beyond the side edge of the absorbent body 3, forming a side flap portion SF where the absorbent body 3 is not present. Between the sheets in each side flap portion SF (for example, between the back sheet 1 and the top sheet 2) (the sheets constituting the side flap portion are also called side flap sheets), a plurality of elongated elastic stretchable members (not shown) are sandwiched and fixed in parallel at intervals in the front-rear direction LD from the waist side portion of the abdominal portion F to the waist side portion of the dorsal portion B, each stretched in the longitudinal direction.

[0049] The portions of the side flap portions SF located in the ventral portion F and the dorsal portion B extend outward in the width direction WD beyond the crotch portion C therebetween, and these portions form waist-side side flap portions WSF that form the waist circumference of the diaper. Of the waist-side side flap portions WSF, those located in the ventral portion F are referred to as ventral side flap portions FSF, and those located in the dorsal portion B are referred to as dorsal side flap portions BSF.

[0050] The fastening tapes 5 are attached to both sides of the back side flap portion BSF so as to protrude from the vicinity of the upper and lower ends of the side edges. The dimensions and shape of the side flap portion SF and the position of the fastening tape 5 are determined so that when the diaper 100 is folded in half along the center in the front-rear direction so that the waist side edge of the abdominal portion F and the waist side edge of the back portion B are aligned, the lower edge of the abdominal side flap portion FSF of the abdominal portion F is located closer to the crotch than the lower edge of the fastening tape 5 on the lower side of the back portion B. In addition, a front target tape 6 is attached along the width direction to the surface of the waist circumference of the abdominal portion F. When putting the diaper 100 on the body, the fastening tapes 5 on both sides are turned from each side of the waist to the outer surface of the abdominal side and fastened to the front target tape 6 with the diaper 100 placed on the body. The front target tape 6 may be omitted, in which case the fastening tape 5 is directly fastened to the outer surface of the diaper (the outer surface of the backsheet 1 in the illustrated embodiment).

[0051] (Base sheet 8) A base sheet 8 is provided at both ends of the back portion B of the disposable diaper 100. For example, the base sheet 8 may be provided so as to be sandwiched between the barrier sheet 4 and the back sheet 1, or as shown in the figure, it may be provided so as to be sandwiched between the top sheet 2 and the back sheet 1. As described above, the position where the base sheet 8 is provided in the thickness direction is not particularly limited, and it can be provided between any of the sheets such as the barrier sheet 4, the top sheet 2, the back sheet 1, and the liquid-impermeable sheet 15, or on the inner surface of the sheet located on the innermost side, or on the back surface of the sheet located on the backmost side. The base sheet 8 and the back sheet 1 or the top sheet 2 are bonded with a hot melt adhesive or the like. The base sheet 8 does not necessarily have to be provided between the back sheet 1 and the top sheet 2. Specifically, it may be provided on the outer surface side of the back sheet 1 or on the inner surface side of the top sheet 2.

[0052] The base sheet 8 has a base end fixed to the diaper body by hot melt adhesive or the like, and is provided so as to extend from the base end to the tip end.

[0053] The base sheet 8 can be formed by bonding together a plurality of nonwoven fabrics, or can be formed from a single piece of nonwoven fabric. Known nonwoven fabrics can be used. As the material fibers constituting the nonwoven fabric, synthetic fibers such as olefin-based fibers such as polyethylene or polypropylene, polyester-based fibers, and amide-based fibers, as well as regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used. In particular, spunbond nonwoven fabrics and SMS nonwoven fabrics using olefin-based fibers are preferred. The basis weight of the nonwoven fabric used can be determined as appropriate, but since it comes into contact with the wearer's skin and a certain level of strength is required, a nonwoven fabric with a high basis weight is desirable, and preferably 50 to 100 g / m 2 It is preferred that the sheet has a basis weight of 1000 g.

[0054] (Fastening tape 12) The tip side of the base sheet 8 is provided with two fastening tapes 12, upper and lower, which protrude outward. The fastening tape 12 has a back side stretchable member 13B provided on the back side BS and extending outward in the width direction WD, a crotch side stretchable member 13C provided on the ventral side FS (also the crotch side CS) and extending outward in the width direction WD, which is stretchable in the width direction WD, and a bridging member 5 that can be fastened to the outer surface of the ventral part F, bridging between the back side stretchable member 13B and the crotch side stretchable member 13C. When the base sheet 8 is made of a stretchable member that can stretch in the width direction WD, the back side stretchable member 13B and the crotch side stretchable member 13C may be formed by protruding the base sheet 8 itself outward, or may be formed by preparing a member separate from the base sheet 8 and fixing it to the base sheet 8 with hot melt or the like. When the base sheet 8 is made of a material that does not stretch in the width direction WD, it is preferable to prepare a member separate from the base sheet 8 and adhere the member to the base sheet 8 with a hot melt or the like to form the back side stretch member 13B and the crotch side stretch member 13C.

[0055] (Back side elastic member 13B and crotch side elastic member 13C) For example, a stretch sheet can be used as the back-side stretchable member 13B and the crotch-side stretchable member 13C. For example, as shown in FIG. 12, the stretch sheet can be one having a first sheet layer 20A, a second sheet layer 20B, and an elastic sheet 30 interposed between the layers 20A and 20B. This stretch sheet has an elastic sheet stretch structure in which the first sheet layer 20A and the second sheet layer 20B are joined through joining holes 31 penetrating the elastic sheet 30 at a number of joining parts 41 arranged at intervals. Although not shown, a portion of the first sheet layer 20A and the second sheet layer 20B may be joined via the elastic sheet 30 at a number of joining parts 41 arranged at intervals. This stretch sheet is contracted in the width direction WD due to the contraction of the elastic sheet 30, and is also extensible in the width direction WD.

[0056] More specifically, in a state where the elastic sheet 30 is stretched in the width direction WD, the first sheet layer 20A and the second sheet layer 20B are joined via the joining holes 31 of the elastic sheet 30 at intervals in the width direction WD and in the front-rear direction LD (direction LD perpendicular to the stretch direction) perpendicular thereto, to form a large number of joining parts 41, thereby forming an elastic sheet stretch structure. By arranging the first joining parts 40 so that the elastic sheet 30 remains uninterrupted in the width direction WD in the stretch region and the first sheet layer 20A and the second sheet layer 20B shrink due to the contraction force of the elastic sheet 30 to form contraction folds 25, such stretchability can be imparted.

[0057] The constituent materials of the first sheet layer 20A and the second sheet layer 20B can be used without any particular limitation as long as they are in the form of a sheet, but it is preferable to use a nonwoven fabric from the viewpoint of flexibility and breathability. The raw fiber of the nonwoven fabric is not particularly limited. For example, synthetic fibers such as olefin-based fibers such as polyethylene and polypropylene, polyester-based fibers, polyamide-based fibers, regenerated fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of these can be exemplified. Furthermore, the nonwoven fabric may be manufactured by any processing method.

[0058] Examples of the processing method include known methods such as the spunlace method, the spunbond method, the thermal bond method, the meltblown method, the needle punch method, the air-through method, and the point bond method. When a nonwoven fabric is used, the basis weight is 10 to 25 g / m 2 It is preferable that the thickness of the first sheet layer 20A and the second sheet layer 20B is about the same. Also, a part or all of the first sheet layer 20A and the second sheet layer 20B may be a pair of layers formed by folding a single material to face each other. Of course, the components of the first sheet layer 20A and the second sheet layer 20B may be provided separately, and the elastic film 30 may be interposed between the components of the first sheet layer 20A and the second sheet layer 20B without folding the components.

[0059] The elastic film 30 is not particularly limited, and as long as it is a thermoplastic resin film having elasticity in itself, it may be non-porous or may have many holes or slits for ventilation. In particular, it is preferable that the elastic film 30 has a tensile strength in the width direction WD of 8 to 25 N / 35 mm, a tensile strength in the front-rear direction LD of 5 to 20 N / 35 mm, a tensile elongation in the width direction WD of 450 to 1050%, and a tensile elongation in the front-rear direction LD of 450 to 1400%. The thickness of the elastic film 30 is not particularly limited, but is preferably about 20 to 40 μm.

[0060] When the first sheet layer 20A and the second sheet layer 20B are joined at the sheet joint 41 through a joint hole 31 formed in the elastic sheet 30, it is desirable that the first sheet layer 20A and the second sheet layer 20B are not joined to the elastic sheet 30 except at least between the first sheet layer 20A and the second sheet layer 20B at the sheet joint 40.

[0061] There is no particular limitation on the means for joining the first sheet layer 20A and the second sheet layer 20B at the sheet joint portion 40. For example, the first sheet layer 20A and the second sheet layer 20B at the sheet joint portion 40 may be joined by a hot melt adhesive, or by a joining means based on material welding such as heat sealing or ultrasonic sealing.

[0062] A two-layer or multi-layer nonwoven fabric sheet can also be used as the back-side elastic member 13B and the crotch-side elastic member 13C. This nonwoven fabric sheet is arranged with elongated elastic and stretchable members sandwiched between any of the sheets that make up the nonwoven fabric sheet, and the entire nonwoven fabric sheet can stretch due to the stretching action of these elongated elastic and stretchable members.

[0063] The material fibers constituting the nonwoven fabric sheet may be synthetic fibers such as olefins, polyesters, and amides, such as polyethylene or polypropylene, as well as regenerated fibers such as rayon or cupra, and natural fibers such as cotton. The elongated elastic stretchable members may be made of materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, and polyester.

[0064] The nonwoven fabric sheet as described above is preferably a sheet having a tensile strength in the width direction WD of 15 to 50 N / 35 mm, a tensile strength in the front-rear direction LD of 10 to 20 N / 35 mm, a tensile elongation in the width direction WD of 30 to 80%, and a tensile elongation in the front-rear direction LD of 40 to 140%. The thickness of the nonwoven fabric sheet is not particularly limited, but is preferably about 200 to 700 μm.

[0065] Although three or more layers of fastening tapes 12 may be provided, a smaller number of layers is preferable in consideration of ease of manufacture and convenience during application, and a layer consisting of two layers is particularly preferable. A portion (valley portion) where both fastening tapes 12A and 12B are separated is formed between the upper fastening tape 12A and the lower fastening tape 12B.

[0066] (Bridge member 5) In the front-rear direction LD, a gap 16 is provided between the back-side stretchable member 13B and the crotch-side stretchable member 13C. That is, a predetermined distance is provided between the back-side stretchable member 13B and the crotch-side stretchable member 13C in the front-rear direction LD, and the two members 13B and 13C are not arranged to be in contact with each other. A bridging member 5 is provided to bridge the back-side stretchable member 13B and the crotch-side stretchable member 13C so as to fill the gap 16. The bridging member 5 extends in the front-rear direction WD, and in the illustrated embodiment, is a rectangle extending in the front-rear direction LD, but is not limited to a rectangle, and may be any shape such as a triangle or ellipse extending in the front-rear direction LD.

[0067] The inner surface of the bridging member 5 is provided with fastening means (not shown) such as an adhesive layer or a hook-and-loop fastener element, and the fastening tape 12 can be fastened to the outer surface of the abdominal portion via these fastening means. As the adhesive layer, for example, an acrylic adhesive mainly made of polyacrylic acid ester, or a rubber adhesive mainly made of a tackifier mainly made of elastic components of natural or synthetic rubber, to which a plasticizer, an anti-aging agent, etc. are added, can be used. In addition, hot melt adhesives can also be used. As the hook-and-loop fastener element, a hook-and-loop fastener hook material or loop material can be used. Note that the fastening means such as an adhesive layer or a hook-and-loop fastener element may be directly provided on the inner surface of the bridging member 5, but an intermediate member such as a sheet may be provided between the bridging member 5 and the fastening means.

[0068] When a hook-and-loop fastener element is provided as the fastening means, the fastening tape 12 is detachably fastened to the front target tape 6 provided on the ventral surface of the diaper via the hook-and-loop fastener element. For example, when the hook-and-loop fastener element provided on the fastening tape 12 is a hook material, the front target tape is a loop material. Conversely, when the hook-and-loop fastener element provided on the fastening tape 12 is a loop material, the front target tape is a hook material. In the illustrated embodiment, the hook material is provided on the inner surface of the bridging member 5. The hook material may have a known protrusion shape, such as a hook shape, a mushroom shape, or a complex shape. The peel strength between the hook-and-loop fastener element and the front target tape 6 is preferably about 300 to 800 gf.

[0069] In order to make it easier to fasten the bridging member 5 to the outer surface of the abdominal portion, it is preferable to attach the bridging member 5 to the inner side of the back-side stretchable member 13B and the crotch-side stretchable member 13C as shown in FIG. 5, etc., but the bridging member 5 may be attached to the outer side of the back-side stretchable member 13B and the crotch-side stretchable member 13C. In the embodiment shown in FIG. 5, etc., the rear BS end of the bridging member 5 in the front-rear direction LD is attached to the back-side stretchable member 13B, and the crotch side CS end of the bridging member 5 in the front-rear direction LD is attached to the crotch-side stretchable member 13C, but the embodiment is not limited to this. For example, the rear side part of the bridging member 5 other than the rear BS end in the front-rear direction LD may be attached to the back-side stretchable member 13B, and the crotch side part of the bridging member 5 other than the crotch side CS end in the front-rear direction LD may be attached to the crotch-side stretchable member 13C.

[0070] In the illustrated embodiment, the bridging member 5 and the back-side elastic member 13B (and the crotch-side elastic member 13C) are joined by an adhesive, but they may be joined by other means such as ultrasonic sealing or heat sealing.

[0071] The number of bridging members 5 provided on each fastening tape 12 can be determined arbitrarily. In the embodiment shown in FIG. 5 and the like, five bridging members 5 are provided for one fastening tape 12, but only one bridging member 5 may be provided for one fastening tape 12, or any number such as 2 to 4, 6 or more. A fastening means is provided on the inner surface of the bridging member 5. Therefore, assuming that the areas of the bridging members 5 are all the same, the more the number of bridging members 5 is increased, the higher the fastening force becomes, and the fastening tape 12 can be firmly fastened. In addition, since the bridging member 5 and the back-side elastic member 13B (and the crotch-side elastic member 13C) are bonded with an adhesive or the like, assuming that the areas of the bridging members 5 are all the same, the more the number of bridging members 5 is increased, the more difficult it is for the back-side elastic member 13B and the crotch-side elastic member 13C to stretch. From the above, it is preferable that the number of bridging members 5 provided for one fastening tape 12 is 3 to 7, and more preferably 4 to 6. In addition, the average area of ​​the bridging member 5 at this time is 100 to 250 mm 2 / piece, preferably 125-200mm 2 It is more preferable to have / piece.

[0072] As shown in embodiment A of FIG. 5 (5A) and FIG. 6 (6A), a gap 16 can be provided between adjacent bridging members 5, 5 in the product state, or as shown in embodiment B of FIG. 8 (8A), adjacent bridging members 5, 5 can be arranged to contact each other in the product state, so that no gap 16 is provided. Note that providing a gap 16 between adjacent bridging members 5, 5 makes it easier for the fastening tape 12 to deform when worn. As a result, the fastening tape 12 can be fastened to the front target tape 6 in a more arbitrary stretched state, and the fit of the diaper can be further improved. Therefore, embodiment A is more preferable than embodiment B.

[0073] Also, as in embodiment C shown in Fig. 9, an intermediate elastic member 13M may be provided between the back-side elastic member 13B and the crotch-side elastic member 13C in the front-to-back direction LD. In the embodiment shown in Fig. 9, the bridging member 5 is divided into two and disposed in the front-to-back direction LD. Compared to embodiment A and embodiment B, embodiment C has the bridging member 5 divided into front and back, which allows more freedom in determining the positions of the bridging members 5 to be attached to the front target tape 6, thereby improving the fit of the diaper.

[0074] 10, the area of ​​the joining region 19B joining the bridging member 5 and the back-side elastic member 13B (area of ​​adhesive; the same applies below) and the area of ​​the joining region 19C joining the bridging member 5 and the crotch-side elastic member 13C (area of ​​adhesive; the same applies below) can be changed. Specifically, in the back-side fastening tape 12B, it is preferable that the area of ​​the joining region 19B joining the bridging member 5 and the back-side elastic member 13B is smaller than the area of ​​the joining region 19C joining the bridging member 5 and the crotch-side elastic member 13C, and conversely, in the crotch-side fastening tape 12C, it is preferable that the area of ​​the joining region 19B joining the bridging member 5 and the back-side elastic member 13B is larger than the area of ​​the joining region 19C joining the bridging member 5 and the crotch-side elastic member 13C. The adhesive applied to the portion hardens and solidifies, so the larger the area of ​​the bonding regions 19B, 19C, the more difficult it becomes for the back-side elastic member 13B and the crotch-side elastic member 13C to stretch. Therefore, by using the embodiment shown in Fig. 10, the fastening tape 12C on the crotch side is more likely to stretch in the diagonally upward pulling direction 22, and the fastening tape 12B on the back side is more likely to stretch in the diagonally downward pulling direction 22, making so-called cross fastening easier.

[0075] In the above-mentioned embodiment D, the entire back surface of the bridging member 5 is not adhered to the back side elastic member 13B or the crotch side elastic member 13C, but a part of it is adhered. In addition to this embodiment, even when the entire back surface of the bridging member 5 is adhered to the back side elastic member 13B or the crotch side elastic member 13C as in the embodiment E shown in FIG. 11, the same effect as that shown in FIG. 10 can be obtained by changing the shape of the bridging member 5. For example, in the embodiment E, the shape of the bridging member 5 is an isosceles triangle long in the front-rear direction. Specifically, in the fastening tape 12B on the back side, the bridging member 5 is gradually narrowed from the crotch side to the back side so that the base of the bridging member 5 overlaps with the crotch side elastic member 13C and the apex of the bridging member 5 overlaps with the back side elastic member 13B. As a result, when it is assumed that the entire ground contact portion of the bridging member 5 and the back side elastic member 13B (and the crotch side elastic member 13C) is bonded, the area of ​​the bonding region 19B bonding the bridging member 5 and the back side elastic member 13B is smaller than the area of ​​the bonding region 19C bonding the bridging member 5 and the crotch side elastic member 13C. On the other hand, in the fastening tape 12C on the crotch side, the bridging member 5 is gradually narrowed from the back side to the crotch side so that the bottom side of the bridging member 5 overlaps with the back side elastic member 13B and the apex of the bridging member 5 overlaps with the crotch side elastic member 13C. As a result, when it is assumed that the entire ground contact portion of the bridging member 5 and the back side elastic member 13B (and the crotch side elastic member 13C) is bonded, the area of ​​the bonding region 19B bonding the bridging member 5 and the back side elastic member 13B is larger than the area of ​​the bonding region 19C bonding the bridging member 5 and the crotch side elastic member 13C. With this configuration, the fastening tape 12C on the crotch side is more likely to stretch in the diagonally upward pulling direction 22, and the fastening tape 12B on the back side is more likely to stretch in the diagonally downward pulling direction 22, making so-called cross fastening easier.

[0076] In the embodiments D and E, the cross fastening is facilitated by changing the area of ​​the adhesive connecting the bridging member 5 and the back-side stretchable member 13B (the crotch-side adhesive member 13C). However, the present invention is not limited to such an embodiment, and the material itself of the back-side stretchable member 13B or the crotch-side adhesive member 13C may be changed to obtain the same effect as in the embodiments D and E. For example, in the back-side fastening tape 12B, the back-side stretchable member 13B may be made of a material that is more stretchable than the crotch-side stretchable member 13C, and in the crotch-side fastening tape 12B, the crotch-side stretchable member 13C may be made of a material that is more stretchable than the back-side stretchable member 13B, thereby facilitating so-called cross fastening.

[0077] (Knob part 14) It is preferable to provide a gripping portion 14 on the outer side of the fastening tape 12 in the width direction WD. The gripping portion 14 is, for example, a portion that the wearer grips when operating the fastening tape 12. The gripping portion 14 may be formed, for example, as shown in FIG. 7, by joining an arbitrary member different from the back side elastic member 13B or the crotch side elastic member 13C to the inner surface of these members 13B and 13C, and the joined member may be the gripping portion 14. The arbitrary member that becomes the gripping portion 14 may be joined to the back surface of the back side elastic member 13B or the crotch side elastic member 13C. In addition, the back side elastic member 13B, the crotch side elastic member 13C, and the member that constitutes the gripping portion 14 may be composed of one member. When composed of one member in this way, this member has a "U" shape.

[0078] (Joining means) The joining means for joining the components can be, for example, adhesives, and can be applied by solid, bead, curtain, summit or spiral coating of hot melt adhesive, or pattern coating (transfer of hot melt adhesive using letterpress printing), or the fixed portion of the elastic member can be formed by applying the adhesive to the outer circumferential surface of the elastic member using a comb gun or SureWrap instead of or in addition to this. Hot melt adhesives include, for example, EVA-based, adhesive rubber-based (elastomer-based), olefin-based, polyester / polyamide-based, and the like, but can be used without any particular limitation. The joining means for joining the components can also be material welding means such as heat sealing or ultrasonic sealing.

[0079] <Explanation of terms used in the specification> As used herein, the following terms have the following meanings unless otherwise specified in the specification.

[0080] "Front body" and "rear body" refer to the front and rear parts of a pants-type disposable diaper, respectively, with the front-rear center as the boundary. The crotch part refers to the front-rear range including the front-rear center of the pants-type disposable diaper, and if the absorbent body has a constricted part, refers to the front-rear range of the part having said constricted part. The ventral part refers to the part located forward of the crotch part in the front-rear direction, and the dorsal part refers to the part located backward of the crotch part in the front-rear direction.

[0081] 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.

[0082] "MD" and "CD" refer to the machine direction (MD) and the cross direction (CD) perpendicular to it in the manufacturing equipment, and depending on the part of the product, one of them may be the front-rear direction and the other the width direction. The MD direction of a nonwoven fabric is the direction of fiber orientation of the nonwoven fabric. Fiber orientation is the direction in which the fibers of the nonwoven fabric are aligned, and can be determined, for example, by a measurement method based on the TAPPI standard method T481 fiber orientation test method using zero-distance tensile strength, or a simplified measurement method that determines the fiber orientation direction from the ratio of tensile strength in the front-rear direction and the width direction.

[0083] "Front side" means the side closest to the wearer's skin when worn, and "back side" means the side away from the wearer's skin when worn.

[0084] "Front surface" means the surface of a component that is closest to the wearer's skin when worn, and "back surface" means the surface that is away from the wearer's skin when worn.

[0085] "Maximum elongation" means the maximum value of elongation in the stretch direction ED (in other words, the elongation in a flat, unfolded state where the first sheet layer and the second sheet layer are unfolded without contraction or slackness), and is expressed as a percentage of the natural length in the unfolded state, with 100% being the natural length.

[0086] "Area ratio" means the proportion of the target part in a unit area, and is expressed as a percentage by dividing the total area of ​​the target parts (e.g., sheet joints 40, openings of joint holes 31, ventilation holes) in the target area (e.g., stretch area 80, non-stretch area 70) by the area of ​​the target area, and in particular, the "area ratio" in the area having a stretch structure means the area ratio in the deployed state. In a form in which many target parts are provided at intervals, it is desirable to determine the area ratio by setting the target area to a size that includes 10 or more target parts.

[0087] "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.

[0088] - "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.

[0089] The "thickness" of the absorbent is measured using a thickness gauge from Ozaki Manufacturing Co., Ltd. (Peacock, large dial thickness gauge, model JB (measurement range 0-35 mm) or model K-4 (measurement range 0-50 mm)) with the sample and the thickness gauge held horizontally.

[0090] - "Thickness" other than the above was measured using an automatic thickness measuring device (KES-G5 Handy Compression Measurement Program) with a load of 0.098N / cm 2 , and pressure area: 2cm 2 The measurement is performed automatically under the following conditions.

[0091] "Tensile strength" and "tensile elongation (elongation at break)" refer to values ​​measured in accordance with JIS K7127:1999 "Plastics - Testing method for tensile properties" with an initial chuck distance (gauge line distance) of 50 mm and a tensile speed of 300 mm / min, except that the test piece is a rectangle of 35 mm wide x 80 mm long. As a tensile tester, for example, Shimadzu's AUTOGRAPH AGS-G100N can be used.

[0092] "Tension stress" means the tensile stress (N / 35mm) measured when stretched within the elastic region by a tensile test with an initial chuck distance (gauge line distance) of 50mm and a tensile speed of 300mm / min according to JIS K7127:1999 "Plastics - Test method for tensile properties" and the degree of stretching can be appropriately determined depending on the test object. The test piece is preferably a rectangle with a width of 35mm and a length of 80mm or more, but if it is not possible to cut out a test piece with a width of 35mm, a test piece with a width that can be cut out is prepared and the measured value is converted to a width of 35mm. Even if the target area is small and sufficient test pieces cannot be taken, if the magnitude of the tension stress is to be compared, it is at least possible to compare it with a test piece of the same size even if a test piece of the same size is used. As a tensile tester, for example, AUTOGRAPH AGS-G100N manufactured by SHIMADZU can be used.

[0093] "Unfolded state" means a flat, unfolded state without contraction or sagging.

[0094] *Unless otherwise specified, the dimensions of each part refer to the dimensions in the unfolded state, not in the natural length state.

[0095] 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%). [Explanation of symbols]

[0096] 1...back sheet, 2...(liquid permeable) top sheet, 3...absorbent body, 4...barrier sheet, 4G...standing elastic stretchable member, 5...bridging member, 6...front target tape, 8...base sheet, 12...fastening tape, 12A...back fastening tape, 12B...crotch fastening tape, 13...stretchable member, 13B...back stretchable member, 13C...crotch stretchable member, 13M...intermediate stretchable member, 14...grip portion, 15...liquid impermeable sheet, 16...gap, 19...bonding region, 19B...back bonding region, 19C...crotch bonding region, 20A...first sheet layer, 20B...second sheet layer, 22...pulling direction, 25...contraction pleats, 30...elastic sheet, 31...jointing hole, 32...non-joined portion, 40...three-dimensional gathers, 41...joined portion, 100...(tape-type) disposable diaper, F...abdominal portion, C...crotch portion, B...dorsal portion, Z...portion of the abdominal portion located on the back side of the front target, EF...end flap portion, SF...side flap portion, LD...front-rear direction, BS...dorsal side (rear side), CS...crotch side, FS...abdominal side (front side), WD...width direction, LS...left side, RS...right side

Claims

1. A crotch portion, a ventral portion extending forward from the crotch portion, and a dorsal portion extending backward from the crotch portion, and fastening tapes provided on both sides of the back portion and extending outward in the width direction, The fastening tape is A back side stretchable member provided on the back side and extending outward in the width direction, capable of stretching in the width direction; A crotch side stretchable member provided on the crotch side and extending outward in the width direction, the crotch side stretchable member being stretchable in the width direction; a bridging member that bridges between the back side elastic member and the crotch side elastic member and can be attached to an outer surface of the abdominal side portion, The bridging member is A plurality of bridging elements are provided adjacent to each other in the width direction, In product condition, There is no gap between adjacent bridging components; In a state where the fastening tape is stretched outward in the width direction, A disposable diaper, characterized in that a gap is generated between adjacent bridging components.

2. A crotch portion, a ventral portion extending forward from the crotch portion, and a dorsal portion extending backward from the crotch portion, and fastening tapes provided on both sides of the back portion and extending outward in the width direction, The fastening tape is A back side stretchable member provided on the back side and extending outward in the width direction, capable of stretching in the width direction; A crotch side stretchable member provided on the crotch side and extending outward in the width direction, the crotch side stretchable member being stretchable in the width direction; a bridging member that bridges between the back-side elastic member and the crotch-side elastic member and can be attached to an outer surface of the abdominal portion, The bridging member is A plurality of bridging elements are provided adjacent to each other in the width direction, In product condition, A gap is provided between adjacent bridging components, In a state where the fastening tape is stretched outward in the width direction, The disposable diaper is characterized in that the gap provided between adjacent bridging components becomes larger.

3. The fastening tape is A back fastening tape provided on the back side; A crotch-side fastening tape is provided on the crotch side, In the dorsal fastening tape, 3. The disposable diaper according to claim 1, wherein the back side elastic member is more easily stretched outward than the crotch side elastic member.

4. In the dorsal fastening tape, The back side elastic member and the bridging member are bonded to each other, and the crotch side elastic member and the bridging member are bonded to each other, The adhesive area between the back side elastic member and the bridging member is The disposable diaper according to claim 3, wherein the adhesive area is smaller than the adhesive area.

5. In the dorsal fastening tape, 5. The disposable diaper according to claim 3, wherein an overlapping area between said back elastic member and said bridging member is smaller than an overlapping area between said crotch elastic member and said bridging member.

6. The fastening tape is A back fastening tape provided on the back side; A crotch-side fastening tape is provided on the crotch side, In the crotch-side fastening tape, 3. The disposable diaper according to claim 1, wherein the crotch side elastic member is more easily stretched outward than the back side elastic member.

7. In the crotch-side fastening tape, The back side elastic member and the bridging member are bonded to each other, and the crotch side elastic member and the bridging member are bonded to each other, 7. The disposable diaper according to claim 6, wherein an adhesion area between the crotch side elastic member and the bridging member is smaller than an adhesion area between the back side elastic member and the bridging member.

8. In the crotch-side fastening tape, 8. The disposable diaper according to claim 6, wherein an overlapping area between the crotch-side elastic member and the bridging member is smaller than an overlapping area between the back-side elastic member and the bridging member.

Images