JP2005095648A - Disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an open-type disposable diaper which can prevent slipping from occurring during wearing and does not give partial oppressive feeling around the waist of the wearer. <P>SOLUTION: The open-type disposable diaper 1A has a waist extensible zone 10 capable of elastically expanding and contracting which is extended at the end part 8 of the front and the back waistband zones 5 and 7 to the horizontal direction, and a pair of wing extensible zone 11 capable of elastically expanding and contracting which is extended to the outside of the horizontal direction from both sides 9 of the back waistband zone 7. In the diaper 1A, the both sides 9 of the back waistband zone 7 is placed between the waist extensible zone 10 and the wing extensible zone 11, and the extension stress of the horizontal direction of the wing extensible zone 11 is larger than that of the horizontal direction of the waist extensible zone 10, and the tensile force acting on the wing extensible zone 11 is segmentalized and prevented by the both sides 9 of the back waistband zone 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a disposable diaper that connects the front and rear torso area through fastening means during wearing.

  A front waist area and a rear waist area in the vertical direction, and a crotch area positioned between the waist areas, and a liquid-permeable top sheet and a liquid-impervious back sheet interposed between the sheets. A liquid-absorbing core, having both ends extending outside the both ends of the core and extending in the lateral direction, and both sides extending outside the both edges of the core and extending in the vertical direction; There is an open-type disposable diaper in which a wing portion extends laterally outward from both sides of the surrounding region, and a pair of tape fasteners are attached to the wing portion of the rear waist region (Patent Document 1).

  The diaper disclosed in Patent Document 1 includes a belt-shaped first elastic member extending in the lateral direction so as to be contractible at the end of the front and rear waist region, and a plurality of thread-like second elastic members extending in the lateral direction are arranged around the rear waist. It is attached so that contraction is possible between the edge of the core in a field, and the 1st elastic member. In this diaper, the second elastic member extends across the both sides of the rear waist area to the wing part, and the wing part in the rear waist area has elastic elasticity in the lateral direction. The tape fastener has a fixed portion fixed to a wing portion in the rear waist region and a free portion extending laterally outward from the fixed portion. A hook of the mechanical fastener is attached to the free part of the tape fastener.

The procedure in which a guardian or a caregiver wears the diaper disclosed in Patent Document 1 on the wearer is as follows. The guardian or caregiver puts the wearer's buttocks on his back on the unfolded diaper, holds the front waist area, folds the crotch area of the diaper, and places the front waist area on the wearer's Put it on the abdomen. Next, while holding the tape fastener, fold the wing in the rear waist area and fold it over the outside of the front waist area. While adjusting the tightening, the free parts of the tape fasteners are alternately fastened to the outer surface of the front waist area to connect the front and back waist areas. A diaper having a front-rear waist region connected thereto is formed with a waist-hole opening and a pair of leg-hole openings.
JP 2000-254176 A

  In the diaper disclosed in Patent Document 1, when the tape fastener is pulled outward in the lateral direction when the diaper is attached, the second elastic member extends in the lateral direction and the wing portion in the rear waistline region extends in the lateral direction. At the same time, the tensile force acting on the second elastic member is transmitted to the first elastic member, the first elastic member extends in the lateral direction in conjunction with the second elastic member, and the end of the rear waist area extends in the horizontal direction. .

  In this diaper, since the first elastic member has a band shape and the second elastic member has a thread shape, the extension stresses of the first and second elastic members are not necessarily the same, and the rear waist region in which the first elastic member extends. The lateral extensional stress at the end of each of the first and second elastic members is different from that in the lateral direction of the wing portion in the rear waistline region where the second elastic member extends.

  In this diaper, if the tensile stress in the lateral direction of the wing part in the rear waist area is greater than that in the lateral direction at the end part of the rear waist area, the wing part is pulled when the tape fastener is pulled laterally outward. The end will extend sideways before the stretch. When the free part of the tape fastener is fastened to the front waist area when the end of the back waist area is fully extended, the diaper is worn on the wearer with the lateral extension of the wing part being insufficient. End up. If the wing in the rear waistline is not sufficiently stretched when the diaper is worn, the contraction force of the wing cannot be used, and the wearer's waist cannot be tightened by the wing. It may cause a shift from the wearing position. In addition, the circumference of the wearer's torso is locally tightened by the end of the rear waist area, and a partial feeling of pressure is given to the circumference of the wearer's torso.

  An object of the present invention is to provide a disposable diaper that can prevent a slippage during wearing and does not give a feeling of partial compression around the wearer's torso.

  The premise of the present invention for solving the above-mentioned problems is that the front waist area and the back waist area in the vertical direction, and a crotch area positioned between these waist areas, and a transparent body located on the skin contact side. A liquid surface sheet, a liquid-impermeable back sheet positioned on the skin non-contact side, and a liquid-absorbent core that is interposed between the sheets and extends from the crotch region toward the front-rear waist region. Both end portions extending laterally located outside the both end edges of the core, and both side portions extending longitudinally positioned outside the both side edges of the core, and are attached via fastening means during mounting. A disposable diaper that connects the front and rear waist area.

  The present invention is characterized in that the diaper has an elastically stretchable waist stretchable region extending laterally to at least an end portion of the rear waistline region of the front and back waistline regions, and the back waistline Elastically stretchable wing stretchable regions extending laterally outward from both sides of the region, and both sides of the rear waistline region are located between the waist stretchable region and the wing stretchable region. The lateral stretching stress of the wing stretchable region is greater than that of the waist stretchable region, and the waist stretchable region does not stretch laterally before the wing stretchable region stretches laterally. There is.

  As an example of an embodiment of the present invention, the stretchability in the lateral direction of the waist stretchable region is provided by a first elastic member attached to the end of the waistline region so as to be shrinkable, and the wing stretchable region is The front and back sheets are formed from a separate elastic sheet.

  As another example of the embodiment of the present invention, in the diaper, the first length dimension in the lateral direction of the waist stretchable region when the waist stretchable region is maximized in the lateral direction is set to 100%, 1 When the waist stretchable region is stretched until the length dimension reaches 90%, the lateral stretch stress of the waist stretchable region is in the range of 0.5 to 3.0 N, and when the wing stretchable region is not stretched When the second length dimension in the transverse direction at 100% is 100% and the wing stretchable area is stretched until the second length dimension becomes 120%, the lateral stretching stress of the wing stretchable area is 1.5 to In the range of 7.0 N, when the wing stretchable region is stretched until the second length dimension is 150%, the lateral extensional stress of the wing stretchable region is in the range of 3.0 to 10.0 N.

  As another example of the embodiment of the present invention, both side portions of the rear waist region are substantially non-stretchable.

  As another example of the embodiment of the present invention, both side portions of the rear waist region are elastically stretchable, and the lateral stretchability of both sides of the rear waist region is the both side portions. The lateral elastic stress of the wing stretchable region is smaller than that of the lateral sides of the rear waist region.

  As another example of the embodiment of the present invention, in the diaper, the third length dimension of the both sides when the both sides of the rear waistline region are extended to the maximum in the lateral direction is set to 100%. 3. When the both side portions are contracted so that the length dimension is 90%, the lateral extension stress of the both side portions is in the range of 5 to 20N.

  According to the disposable diaper according to the present invention, the tensile force acting on the wing stretch region is divided and suppressed by the both sides of the rear waist region located between the waist stretch region and the wing stretch region. The tensile force transmitted to can be reduced. In this diaper, in the process of extending the wing stretch area, the waist stretch area with a lower elongation stress than the wing stretch area stretches in the lateral direction, but before the wing stretch area stretches in the lateral direction, the waist stretch area stretches laterally. The diaper can be worn on the wearer with the wing stretchable region fully extended in the lateral direction. This diaper can securely tighten around the wearer's torso by using the contraction force between the wing stretch region and the waist stretch region, and can prevent the diaper from slipping down from the wearing position. In this diaper, the waist stretchable region does not locally tighten around the wearer's torso, and does not give a feeling of partial compression around the wearer's torso.

  In diapers where both sides of the rear waist area can be elastically stretched and the lateral extension stress of both sides is greater than that of the wing stretch area, the tensile force acting on the wing stretch area Even if it is transmitted to both sides of the surrounding area, the tensile force is divided and suppressed by the both sides of the rear waist area that has a larger elongation stress than the wing expansion / contraction area, and the tensile force transmitted to the waist expansion / contraction area can be reduced. . In this diaper, in the process of extending the wing stretch area, the waist stretch area with a lower elongation stress than the wing stretch area stretches in the lateral direction, but before the wing stretch area stretches in the lateral direction, the waist stretch area stretches laterally. The diaper can be worn on the wearer with the wing stretchable region fully extended in the lateral direction. This diaper can securely tighten around the wearer's torso by using the contraction force between the wing stretch region and the waist stretch region, and can prevent the diaper from slipping down from the wearing position.

  The details of the disposable diaper according to the present invention will be described with reference to the accompanying drawings.

  1 and 2 are a partially broken perspective view of a diaper 1A shown as an example, and an end view taken along line II-II in FIG. 1, and FIGS. 3 and 4 are cross-sectional views taken along line III-III in FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 1. In FIG. 1, the horizontal direction is indicated by an arrow L, the vertical direction is indicated by an arrow M, and the thickness direction is indicated by an arrow N. In addition, the inner surfaces of the front and back sheets 2 and 3 and the leak-proof sheet 12 refer to surfaces facing the core 4, and the outer surfaces of the sheets 2, 3 and 12 refer to surfaces not facing the core 4.

  The diaper 1 </ b> A has a liquid-absorbing surface sheet 2 positioned on the skin contact side, a liquid-impermeable back sheet 3 positioned on the skin non-contact side, and a liquid-absorbing property interposed between the front and back sheets 2 and 3. The core 4 is a main component. The diaper 1 </ b> A includes a front waistline region 5 and a back waistline region 7 in the vertical direction, and a crotch region 6 positioned between the waistline regions 5 and 7, and is positioned outside both end edges 4 a of the core 4. And both end portions 8 extending in the lateral direction around the front and rear waist regions 5, 7 and both side portions 9 positioned outside the both side edges 4b of the core 4 and extending between the front and rear waist regions 5, 7 in the vertical direction.

  The diaper 1 </ b> A is formed at the end portions 8 of the front and rear waist regions 5 and 7, and elastically stretchable waist stretchable region 10 extending laterally, and laterally outward from both side portions 9 of the rear waist region 7. A pair of elastically stretchable wing stretchable areas 11 extending. The diaper 1 </ b> A has a lateral length of both side portions 9 of the front waistline region 5 larger than that of the side portions 9 of the crotch region 6 and its planar shape substantially exhibits an hourglass shape. A pair of leak-proof sheets 12 extending in the vertical direction are attached to both side portions 9.

  The top sheet 2 is formed from a breathable hydrophilic fiber nonwoven fabric 13. The back sheet 3 is formed of a breathable liquid-impervious plastic film 14 and a breathable hydrophobic fiber nonwoven fabric 15 that overlap each other. In the back sheet 3, the film 14 is positioned on the skin contact side, and the nonwoven fabric 15 is positioned on the skin non-contact side. The opposing surfaces of the film 14 and the nonwoven fabric 15 are intermittently joined via an adhesive (not shown). The core 4 extends from the crotch region 6 toward the front and rear waist regions 5 and 7 and is fixed to at least one inner surface of the top sheet 2 and the back sheet 3.

  The core 4 is a mixture of particulate or fibrous superabsorbent polymer and fluff pulp, or a mixture of particulate or fibrous superabsorbent polymer, fluff pulp and thermoplastic synthetic resin fiber. Compressed to thickness. The core 4 is preferably encased in a liquid-permeable sheet such as tissue paper or a hydrophilic fiber nonwoven fabric in order to prevent the core 4 from losing its shape or from falling off the polymer. As the polymer, a starch system, a cellulose system, or a synthetic polymer system can be used.

  Both end portions 8 are formed from an end portion 2 a of the topsheet 2 and an end portion 3 a of the backsheet 3 that extend from the end edge 4 a of the core 4 in the longitudinal direction outward. At both end portions 8, the inner surfaces of the sheets 2 and 3 are fixed with the end portions 2 a and 3 a of the front and back sheets 2 and 3 overlapping each other. The stretchability of the waist stretchable region 10 is provided by a belt-shaped first elastic member 16 (elastic member for waistline) attached to the end portions 8 of the front and rear waistline regions 5 and 7 so as to be shrinkable. The 1st elastic member 16 is interposed between the edge part 2a of the surface sheet 2, and the edge part 3a of the back surface sheet 3, and it intermittently attaches to the inner surface of these sheets 2 and 3 via an adhesive agent (not shown). It is fixed. When the first elastic member 16 is fixed to the front and back sheets 2 and 3, the first elastic member 16 is in a state of being expanded to a predetermined magnification in the lateral direction. In the waist stretchable region 10, the front and back sheets 2, 3 contract in the lateral direction due to the contraction of the elastic member 16, and a large number of gathers are formed in the sheets 2, 3 to undulate in the thickness direction of the diaper 1 </ b> A.

  Both side portions 9 are formed of side portions 2 b and 3 b of front and back sheets 2 and 3 extending from the side edge 4 b of the core 4 outward in the vertical direction and a fixed side portion 12 a to be described later of the leak-proof sheet 12. At both side portions 9, the side portion 2 b of the top sheet 2 slightly extends laterally outward from the side edge 4 b of the core 4, and further laterally outward from the side portion 2 b to the side portion 3 b of the back sheet 3 and the leak-proof sheet. Twelve side portions 12a extend. At both side portions 9, the inner and outer surfaces of the sheets 2, 3, 12 are fixed with the side portions 2 b, 3 b, 12 a of the sheets 2, 3, 12 overlapping each other. Both side portions 9 are substantially non-stretchable. Both side portions 9 of the rear waist region 7 are located between the waist stretch region 10 and the wing stretch region 11.

  A large number of thread-like elastic members 17 around the legs extending in the longitudinal direction are attached to both side portions 9 of the crotch region 6 so as to be shrinkable. The leg-around elastic member 17 is interposed between the side part 3b of the back sheet 3 and the fixed side part 12a of the leak-proof sheet 12, and an inner surface of the sheets 3 and 12 via an adhesive (not shown). It is fixed intermittently. When the leg-surrounding elastic member 17 is fixed to the back sheet 3 and the leak-proof sheet 12, the leg-surrounding elastic member 17 is in a state of being stretched in the vertical direction at a predetermined magnification. At the both side portions 9, the back sheet 3 and the leak-proof sheet 12 are contracted in the vertical direction due to the contraction of the elastic member 17, and a large number of gathers are formed in the sheets 3, 12 to undulate in the thickness direction of the diaper 1 </ b> A.

  The wing stretchable region 11 is formed from a stretchable sheet 18 having elastic stretchability in a lateral direction separate from the front and back sheets 2 and 3 and the leak-proof sheet 12. In the wing stretchable region 11, the lateral extension stress is larger than the lateral stretch stress of the waist stretchable region 10. As for the wing expansion-contraction area | region 11, the horizontal direction inner end part 11a is interposed between the side part 3b of the back surface sheet 3, and the fixed side part 12a of the leak-proof sheet 12, and the inner end part 11a is the inner surface of these sheets 3 and 12. Are fixed to each other via an adhesive (not shown). A pair of tape fasteners 19 (fastening means) extending in the lateral direction are attached to the laterally outer end portion 11 b of the wing stretchable region 11.

  The stretchable sheet 18 is formed from two breathable hydrophobic fiber nonwoven fabrics 20 and a breathable liquid-impermeable and stretchable plastic film 21 interposed between the nonwoven fabrics 20. In these nonwoven fabrics 20, a large number of gathers that undulate in the thickness direction of the diaper 1A are formed.

  As an example of the manufacturing method of the elastic sheet 18, the nonwoven fabric 20 is overlap | superposed and joined on both surfaces of the elastic plastic film 21 in the state extended | stretched to the horizontal direction. When the extension of the plastic film 21 is released, the film 21 contracts in the lateral direction and the nonwoven fabric 20 contracts in the lateral direction, and gathers are formed in the nonwoven fabric 20. The nonwoven fabric 20 and the film 21 are intermittently joined via a large number of dot-like heat fusion portions 23 in which the opposed surfaces overlap with each other, with the surfaces facing each other. For joining the nonwoven fabric 20 and the film 21, heat welding means such as heat sealing or sonic sealing can be used. The nonwoven fabric 20 and the film 21 may be intermittently joined via an adhesive instead of the heat fusion part 23.

  The nonwoven fabric 20 is formed from a polyolefin-based thermoplastic synthetic resin fiber. As the polyolefin-based thermoplastic synthetic resin, any of polyamide-based, polyester-based, polyethylene-based, and polypropylene-based resins can be used. The plastic film 21 is formed from a thermoplastic synthetic resin having rubber-like elasticity. As the thermoplastic synthetic resin forming the film 21, one of a styrene block copolymer, a polyurethane block copolymer, a polyester block copolymer, a polyamide block copolymer, or a copolymer blend is used. be able to. As the styrene block copolymer, styrene-butadiene-styrene (S-B-S) or styrene-ethylenebutadiene-styrene (S-EB-S) can be used. As the copolymer blend, styrene-ethylenebutadiene-styrene / polypropylene (S-EB-S / PP) or polypropylene / ethylene-propylene (PP / EP) can be used.

  The stretchable sheet 18 may be formed of a single breathable hydrophobic fiber nonwoven fabric 20 and a breathable liquid-impervious and stretchable plastic film 21. In this case, the nonwoven fabric 20 is overlapped on one side of the stretchable plastic film 21 in a state of being stretched in the lateral direction, and the nonwoven fabric 20 and the film 21 are joined via the heat-sealing portion 23 or an adhesive.

  The tape fastener 19 has a fixed portion 19a fixed to the outer end portion 11b of the wing stretchable region 11 via an adhesive (not shown), and a free portion 19b extending laterally outward from the fixed portion 19a. The tape fastener 19 uses a fiber nonwoven fabric formed from a polyolefin-based thermoplastic synthetic resin fiber or a plastic film formed from a polyolefin-based thermoplastic synthetic resin. A large number of hooks 24 extending in the thickness direction of the diaper 1A are attached to the free portion 19b. The hook 24 is made of a polyolefin-based thermoplastic synthetic resin. Instead of the hook 24, an adhesive may be applied to the free part 19b.

  A target tape 25 (fixing means) for fixing the free portion 19b of the tape fastener 19 in a detachable manner is attached to the front waistline region 5. The target tape 25 has a rectangular shape that is long in the lateral direction, and is fixed intermittently or continuously to the outer surface of the back sheet 3 via an adhesive (not shown). As the target tape 25, a fiber non-woven fabric formed from a polyolefin-based thermoplastic synthetic resin fiber or a plastic film formed from a polyolefin-based thermoplastic synthetic resin is used. On the outer surface of the target tape 25, a large number of loops 26 that form an arc in the thickness direction of the diaper 1A are attached. The loop 26 is formed from a polyolefin-based thermoplastic synthetic resin. When an adhesive is applied to the free part 19 b of the tape fastener 19, a plastic film is used for the target tape 25.

  The leak-proof sheet 12 is formed from a breathable hydrophobic fiber nonwoven fabric 27. The leak-proof sheet 12 is located on both side portions 9 and extends in the vertical direction between the front and rear waist regions 5 and 7, and the front and rear waist regions 5 and 5 have a tendency to stand up above the top sheet 2. 7 includes a movable portion 12b extending in the vertical direction between the seven portions, and fixed both end portions 12c lying at both end portions 8 and lying inward in the lateral direction of the diaper 1A. A stretchable elastic member 28 extending in the vertical direction is attached above the movable portion 12b so as to be shrinkable. The elastic member 28 is intermittently fixed to the movable portion 12b via an adhesive (not shown) while being covered with a part of the movable portion 12b. The fixed both end portions 12 c are fixed to the outer surface of the end portion 2 a of the topsheet 2. In the leak-proof sheet 12, when the diaper 1A is bent in the vertical direction with the top sheet 2 inside, the elastic member 28 contracts, the movable part 12b stands above the top sheet 2, and the movable part 12b is a barrier against excrement. Form.

  The procedure in which a guardian or a caregiver wears the diaper 1A on the wearer is as follows. The guardian or caregiver puts the wearer's buttocks on his / her back on the unfolded diaper 1A, then holds the front waistline region 5 and bends the crotch region 6 of the diaper 1A, and the front waistline region 5 is placed on the wearer's abdomen. Next, the wing stretchable region 11 is bent by holding the free portion 19b of the tape fastener 19 so that the wing stretchable region 11 of the rear waistline region 7 is positioned on the wearer's abdomen. A guardian or a caregiver puts the wing stretchable region 11 on the outside of the end portion 8 and both side portions 9 of the front waistline region 5, and tightens the waistline of the wearer with the waist stretchable region 10 or the wing stretchable region 11. While adjusting, one side of the free part 19b of the tape fastener 19 is fixed to the outer surface of the target tape 25 while extending the wing stretchable region 11 in the lateral direction, and the other side of the free part 19b of the tape fastener 19 is fixed to the outer surface of the target tape 25. The front and rear waist areas 5 and 7 are connected to each other.

  In order to fix the tape fastener 19 to the target tape 25, the free portion 19 b of the tape fastener 19 is pressed against the outer surface of the target tape 25, and the hook 24 and the loop 26 are engaged. The diaper 1A connected to the front and rear waist areas 5, 7 is formed with a waist opening and a pair of leg openings (not shown). Excretion excreted during wearing of the diaper 1 </ b> A is absorbed and held in the core 4 through the top sheet 2.

  In the diaper 1, when the tape fastener 19 is pulled outward in the lateral direction, the wing stretchable region 11 extends in the lateral direction, and the tensile force acting on the wing stretchable region 11 is between the waist stretchable region 10 and the wing stretchable region 11. It is transmitted to both side portions 9 of the rear waist area 7 located at the center. In the diaper 1 </ b> A, even if the tensile force acting on the wing stretchable region 11 is transmitted to both side portions 9 of the rear waist region 7, the tensile force is divided and suppressed by the side portions 9 that are substantially non-stretchable. The tensile force transmitted from 11 to the waist stretchable region 10 can be reduced. Therefore, in the diaper 1A, in the process of extending the wing stretchable region 11, the waist stretchable region 10 having an elongation stress smaller than that of the stretchable region 11 extends in the lateral direction, but before the wing stretchable region 11 extends in the lateral direction, the waist stretchable region 10 The free portion 19b of the tape fastener 19 can be fixed to the target tape 25 in a state where the wing stretchable region 11 is stretched together with the waist stretchable region 10.

  A guardian or a caregiver can wear the diaper 1A on the wearer in a state where the wing stretchable region 11 is stretched in the lateral direction as well as the waist stretchable region 10, and the wing stretchable region 11 is stretched in the lateral direction. However, the diaper 1 </ b> A will not be worn by the wearer in a state where this is insufficient. The diaper 1 </ b> A can securely tighten around the wearer's torso using the contraction force between the waist stretchable region 10 and the wing stretchable region 11 when the diaper 1 </ b> A is worn. In the diaper 1A, both ends 8 and both sides 9 of the front and rear waist areas 5, 7 are brought into close contact with the wearer's skin by the contraction force of the stretchable areas 10, 11, and the both ends 8 and both sides 9 are displaced. There is nothing and can prevent the diaper 1A from slipping down from the wearing position.

  In the diaper 1A, the waist stretchable region 10 does not locally tighten around the wearer's torso, and does not give a partial feeling of pressure around the wearer's torso. In the diaper 1A, since the lateral stretching stress of the waist stretchable region 10 in the front waistline region 5 is smaller than that in the lateral direction of the wing stretchable region 11, the waist stretchable region 10 in the front waistline region 5 is the wearer's torso. Even if the periphery is tightened, the wearer's abdominal breathing is not hindered, and there is no discomfort for the worn diaper 1A.

  In the diaper 1 </ b> A, the first length dimension in the lateral direction of the stretchable area 10 when the waist stretchable area 10 is extended to the maximum in the lateral direction is 100%, and the waist stretches until the first length dimension is 90%. The extensional stress in the transverse direction of the stretchable region 10 when the region 10 is stretched is in the range of 0.5 to 3.0N. In the diaper 1A, the second length dimension in the transverse direction when the wing stretchable area 11 is not stretched is 100%, and the stretchable area 11 when the wing stretchable area 11 is stretched until the second length dimension becomes 120%. The stretching stress in the lateral direction of the stretchable region 11 is 3.0 to 3.0 when the wing stretchable region 11 is stretched until the lateral stretch stress is in the range of 1.5 to 7.0 N and the second length dimension is 150%. It is in the range of 10.0N.

  When the elongation stress of the wing stretchable region 11 exceeds the above numerical value, a large tensile force is required when the stretchable region 11 is stretched in the lateral direction. Therefore, the tensile force transmitted from the wing stretchable region 11 to the waist stretchable region 10 is applied to both side portions 9. Cannot be sufficiently suppressed, and a large tensile force is transmitted from the expansion / contraction area 11 to the expansion / contraction area 10, and the waist expansion / contraction area 10 extends laterally before the wing expansion / contraction area 11 is extended. There is a case where the diaper 1 </ b> A is worn in a state where the lateral extension is insufficient.

  If the stretching stress of the waist stretchable area 10 is less than the above value, the stretchable area 10 will be fully stretched with a slight tensile force, so that the diaper 1A cannot be worn with the wing stretchable area 11 fully stretched. Of course, the contraction force of the waist stretchable region 10 does not substantially act, and the wearer's torso cannot be tightened through the stretchable region 10. When the elongation stress of the waist stretchable region 10 exceeds the above value and the stretch stress of the wing stretchable region 11 is less than the above value, the waist stretchable region 10 tightens the wearer's torso with an unnecessarily large stretch stress. It gives a feeling of partial compression around the torso and hinders the wearer's abdominal breathing. Further, the contraction force of the wing stretchable region 11 does not substantially act, and the wearer's torso cannot be tightened via the stretchable region 11.

The elongation stress of the waist stretchable region 10 was measured by the following method.
(1) A waist stretchable region 10 (including the first elastic member 16) is cut from the end 8 of the rear waist region 7 of the diaper 1A, and a first sample for measuring an extensional stress having a lateral dimension of 220 to 240 mm is obtained. create. Instron 5543 manufactured by Instron Japan Company or Autograph was used for the measurement of the elongation stress.
(2) The one end of the first sample in the lateral direction is sandwiched between the upper chucks, and the other end in the lateral direction of the first sample is sandwiched between the lower chucks. The length dimension of the sample between chucks is 125 mm. The first sample is pulled up and down under the condition of 100 mm / min so that the chucks are separated from each other, and the sample is extended.
(3) The length of the sample between the chucks when the first sample is extended to the maximum extent is 100%, and the sample is extended until the length of the first sample between the chucks reaches 90%. The extension stress of the first sample is measured, and the measured extension stress is defined as the extension stress in the lateral direction of the waist stretchable region 10.

The elongation stress of the wing stretchable region 11 was measured by the following method.
(1) A second side for measuring an extensional stress formed by cutting out both side portions 9 of the rear waistline region 7 from the diaper 1A and forming a part of both side portions 9 and the entire wing stretchable region 11 (including the tape fastener 19). Create a sample. Instron 5543 manufactured by Instron Japan Company or Autograph was used for the measurement of the elongation stress.
(2) A fixing jig is attached to both side portions 9 excluding the wing stretchable region 11 of the second sample over the entire length in the vertical direction. The tape fastener 19 of the second sample is sandwiched by the upper chuck, and the jig is sandwiched by the lower chuck. The length dimension of the sample between the chucks is 70 mm.
(3) The length dimension between the chucks when the second sample is not extended is set to 100%. Between the chucks, the sample extends without sagging. The second sample is pulled up and down under the condition of 100 mm / min so that the chucks are separated from each other, thereby extending the second sample. The sample is stretched until the length dimension between the chucks of the second sample reaches 120%, the elongation stress of the second sample at that time is measured, and the length dimension between the chucks of the second sample reaches 150%. The sample is stretched, the extension stress of the second sample at that time is measured, and the measured extension stress is set as the extension stress in the lateral direction of the wing stretch region 11.

  5 and 6 are a partially broken perspective view of a diaper 1B shown as another example, and an end view taken along line VI-VI in FIG. 5, and FIGS. 7 and 8 are cross-sectional views taken along line VII-VII in FIG. And a sectional view taken along line VIII-VIII in FIG. In FIG. 5, the horizontal direction is indicated by an arrow L, the vertical direction is indicated by an arrow M, and the thickness direction is indicated by an arrow N.

  The diaper 1 </ b> B includes a liquid-permeable top sheet 2 and a liquid-impervious back sheet 3, and a liquid-absorbent core 4 interposed between the front and back sheets 2 and 3 as main components. The diaper 1 </ b> B includes a front waistline region 5 and a back waistline region 7 in the vertical direction, and a crotch region 6 positioned between the waistline regions 5, 7, and is positioned outside both end edges 4 a of the core 4. And both end portions 8 extending in the lateral direction around the front and rear waist regions 5, 7 and both side portions 9 positioned outside the both side edges 4b of the core 4 and extending between the front and rear waist regions 5, 7 in the vertical direction.

  The diaper 1 </ b> B is formed at the end portions 8 of the front and rear waist regions 5 and 7, and elastically stretchable waist stretchable region 10, and laterally outward from both side portions 9 of the rear waist region 7. And an elastically stretchable wing stretchable region 11. Leakproof sheets 12 extending in the vertical direction are attached to both side portions 9. The top sheet 2 is formed from the same nonwoven fabric 13 as that of the diaper 1 </ b> A, and the back sheet 3 is formed of the same film 14 and nonwoven fabric 15 as that of the diaper 1 </ b> A. The core 4 is the same as that of the diaper 1A.

  Both end portions 8 are formed from an end portion 2 a of the topsheet 2 and an end portion 3 a of the backsheet 3 that extend from the end edge 4 a of the core 4 in the longitudinal direction outward. At both ends 8, the end portions 2a and 3a of the front and back sheets 2 and 3 are fixed in an overlapping state. The stretchability of the waist stretchable region 10 is provided by a belt-shaped first elastic member 16 (elastic member for waistline) attached to the end portions 8 of the front and rear waistline regions 5 and 7 so as to be shrinkable. The first elastic member 16 is interposed between the end portion 2a of the top sheet 2 and the end portion 3a of the back sheet 3, and is fixed to the inner surfaces of the sheets 2 and 3 in a state where the first elastic member 16 extends in the lateral direction at a predetermined magnification. ing. In the waist stretchable region 10, a large number of gathers that undulate in the thickness direction of the diaper 1 </ b> B are formed on the front and back sheets 2, 3 by contraction of the elastic member 16.

  Both side portions 9 are formed from side portions 2 b and 3 b of front and back sheets 2 and 3 extending from the side edge 4 b of the core 4 outward in the vertical direction and a fixed side portion 12 a of the leak-proof sheet 12. In both side portions 9, the side portion 2b of the topsheet 2 slightly extends laterally outward from the side edge 4b of the core 4, and the side portion 3b and the side portion 12a extend further laterally outward from the side portion 2b. Yes. At the side portions 9, the side portions 2 b, 3 b, 12 a of the sheets 2, 3, 12 are fixed in an overlapping state.

  Both side portions 9 of the rear waist region 7 have elastic elasticity in the lateral direction, and are located between the waist elastic region 10 and the wing elastic region 11. The stretchability of both side portions 9 is imparted by a second elastic member 22 attached thereto so as to be shrinkable. The second elastic member 22 has a substantially rectangular shape that is long in the vertical direction. The second elastic member 22 is interposed between the side portion 3b of the back sheet 3 and the fixed side portion 12a of the leak-proof sheet 12, and is intermittently connected to the inner surfaces of the sheets 3 and 12 via an adhesive (not shown). Fixed. When the second elastic member 22 is fixed to the back sheet 3 and the leak-proof sheet 12, the second elastic member 22 is in a state of being expanded in the lateral direction at a predetermined magnification. At both side portions 9 of the rear waist region 7, the back sheet 3 and the leak-proof sheet 12 contract in the lateral direction due to the contraction of the elastic member 22, and a large number of gathers that undulate in the thickness direction of the diaper 1B are formed in the sheets 3 and 12. Is formed.

  A large number of thread-like elastic members 17 around the legs extending in the longitudinal direction are attached to both side portions 9 of the crotch region 6 so as to be shrinkable. The leg-around elastic member 17 is interposed between the side part 3b of the back sheet 3 and the fixed side part 12a of the leak-proof sheet 12, and extends in the vertical direction at a predetermined magnification in the inner surfaces of the sheets 3 and 12. It is fixed to. On both side portions 9 of the crotch region 6, a large number of gathers that undulate in the thickness direction of the diaper 1 </ b> B are formed on the back sheet 3 and the leak-proof sheet 12 by contraction of the elastic member 17.

  The wing stretchable region 11 is formed from a stretchable sheet 18 having elastic stretchability in a lateral direction separate from the front and back sheets 2 and 3 and the leak-proof sheet 12. In the wing stretchable region 11, the lateral extension stress is larger than the lateral stretch stress in the waist stretchable region 10, and is smaller than the lateral stretch stress in both side portions 9 of the rear waistline region 7. As for the wing expansion-contraction area | region 11, the horizontal direction inner end part 11a is interposed between the side part 3b of the back surface sheet 3, and the fixed side part 12a of the leak-proof sheet 12, and the inner end part 11a is the inner surface of these sheets 3 and 12. It is fixed to. The inner end portion 11 a of the wing stretchable region 11 has substantially the same length in the longitudinal direction as that of the second elastic member 22 attached to both side portions 9 of the rear waist region 7. A tape fastener 19 (fastening means) extending in the lateral direction is attached to the laterally outer end portion 11 b of the wing stretchable region 11. The stretchable sheet 18 is the same as that of the diaper 1 </ b> A, and is formed of two breathable hydrophobic fiber nonwoven fabrics 20 and a breathable liquid-impermeable and stretchable plastic film 21 interposed between the nonwoven fabrics 20. Yes. The nonwoven fabric 20 and the film 21 are intermittently joined via a large number of dot-like heat fusion parts 23.

  The tape fastener 19 has a fixed portion 19a fixed to the outer end portion 11b of the wing stretchable region 11, and a free portion 19b extending outward in the lateral direction from the fixed portion 19a. A large number of hooks 24 extending in the thickness direction of the diaper 1B are attached to the free portion 19b. The tape fastener 19 and the hook 24 are made of the same material as that of the diaper 1A.

  A target tape 25 (fixing means) for fixing the free portion 19b of the tape fastener 19 in a detachable manner is attached to the front waistline region 5. The target tape 25 has a rectangular shape that is long in the horizontal direction, and is fixed to the outer surface of the back sheet 3. On the outer surface of the target tape 25, a large number of loops 26 that form an arc in the thickness direction of the diaper 1B are attached. The target tape 25 and the loop 26 are made of the same material as that of the diaper 1A.

  The leak-proof sheet 12 is formed from the same nonwoven fabric 27 as that of the diaper 1A. The leak-proof sheet 12 is located on both side portions 9 and extends in the vertical direction, the fixed side portion 12a, the movable portion 12b having a tendency to stand up above the topsheet 2, and the both end portions 8 inward in the lateral direction. It has a fixed fixed end 12c. A stretchable elastic member 28 extending in the vertical direction is attached above the movable portion 12c so as to be shrinkable. The fixed both end portions 12 c are fixed to the outer surface of the end portion 2 a of the topsheet 2. The movable part 12b stands up above the top sheet 2 and forms a barrier against excrement.

  The procedure in which a guardian or a caregiver wears the diaper 1B on the wearer is the same as that of the diaper 1A, and the description thereof is omitted. When the diaper 1B grips the free part 19b of the tape fastener 19 and pulls the fastener 19 outward in the lateral direction, the wing stretchable region 11 extends in the lateral direction and the tensile force acting on the wing stretchable region 11 is reduced by the waist. It is transmitted to both side portions 9 of the rear waist region 7 located between the stretch region 10 and the wing stretch region 11. In the diaper 1 </ b> B, even if the tensile force acting on the wing stretchable region 11 is transmitted to the both side portions 9 of the rear waistline region 7, the tensile force is divided and suppressed by the both side portions 9 having a larger extension stress than the stretchable region 11. The tensile force transmitted from the wing stretchable region 11 to the waist stretchable region 10 can be reduced. Therefore, in the diaper 1B, in the process of extending the wing stretchable region 11, the waist stretchable region 10 having an elongation stress smaller than that of the stretchable region 11 extends in the lateral direction, but before the wing stretchable region 11 extends in the lateral direction, the waist stretchable region 10 The free portion 19b of the tape fastener 19 can be fixed to the target tape 25 in a state where the wing stretchable region 11 is stretched together with the waist stretchable region 10.

  A guardian or a caregiver can wear the diaper 1B on the wearer in a state where the wing stretchable region 11 is stretched in the lateral direction as well as the waist stretchable region 10, and the wing stretchable region 11 is stretched in the lateral direction. However, the diaper 1B will not be worn by the wearer in a state where this is insufficient. The diaper 1 </ b> B can securely tighten around the wearer's torso using the contraction force of the stretchable regions 10 and 11 when the diaper 1 </ b> B is worn. In the diaper 1B, both end portions 8 and both side portions 9 of the front and rear waist regions 5, 7 are brought into close contact with the wearer's skin by the contraction force of the stretch regions 10, 11, and the both end portions 8 and both side portions 9 are displaced. There is nothing and can prevent the diaper 1B from slipping down from the wearing position.

  In the diaper 1 </ b> B, the waist stretchable region 10 does not locally tighten around the wearer's torso, and does not give a partial feeling of pressure around the wearer's torso. In the diaper 1B, the lateral stretching stress of the waist stretchable region 10 in the front waistline region 5 is smaller than that in the lateral direction of the wing stretchable region 11, so that the waist stretchable region 10 in the front waistline region 5 is the waist of the wearer. Even if the periphery is tightened, the wearer's abdominal breathing is not hindered, and there is no discomfort for the worn diaper 1B.

  In the diaper 1B, the waist stretchable so that the first length dimension in the lateral direction of the stretchable area 10 when the waist stretchable area 10 is extended to the maximum in the lateral direction is 100%, and the first length dimension is 90%. When the region 10 is contracted, the stretching stress in the lateral direction of the stretchable region 10 is in the range of 0.5 to 3.0 N, and the second length in the lateral direction when the wing stretchable region 11 is not stretched is 100%. When the wing stretchable region 11 is stretched so that the second length dimension is 120%, the lateral stretch stress of the stretchable region 11 is in the range of 1.5 to 7.0 N, and the second length dimension is 150%. When the wing stretchable region 11 is stretched so as to become, the lateral extension stress of the stretchable region 11 is in the range of 3.0 to 10.0N.

  In the diaper 1B, the third length dimension of both side portions 9 when the both side portions 9 of the rear waistline region 7 are extended to the maximum in the lateral direction is taken as 100%, and the third length dimension is changed from 100% to 90%. The lateral extensional stress of the side portions 9 when the both side portions 9 of the rear waistline region 7 are contracted is in the range of 5 to 20N. If the elongation stress of both side portions 9 of the rear waist region 7 is less than the above value, the tensile force transmitted from the wing stretch region 11 to the waist stretch region 10 cannot be sufficiently suppressed by the both side portions 9, and the tensile force is stretched by the wing. The diaper 1B is easily transmitted from the region 11 to the waist stretchable region 10, and the stretchable region 10 is stretched laterally before the stretchable region 11 is stretched, and the wing stretchable region 11 is not sufficiently stretched in the lateral direction. It may be worn.

The measuring method of the elongation stress of the waist elastic region 10 and the tensile stress of the wing elastic region 11 is the same as that of the diaper 1A. The elongation stress of both side portions 9 of the rear waist area 7 was measured by the following method.
(1) Both side portions 7 (including the second elastic member 22) are cut from the rear waist region 7 of the diaper 1B, and a third sample for measuring an extensional stress having a lateral dimension of 10 to 50 mm is prepared. Instron 5543 manufactured by Instron Japan Company or Autograph was used for the measurement of the elongation stress.
(2) One end of the third sample in the lateral direction is sandwiched between the upper chucks, and the other end in the lateral direction of the first sample is sandwiched between the lower chucks. The length dimension of the sample between chucks is 10 mm. The third sample is pulled up and down under the condition of 100 mm / min so that the chucks are separated from each other, and the sample is extended.
(3) The length of the sample between the chucks when the third sample is extended to the maximum extent is 100%, and the sample is extended until the length of the third sample between the chucks reaches 90%. The extension stress of the third sample is measured, and the measured extension stress is set as the extension stress in the lateral direction of both side portions 9 of the rear waist region 7.

  As the top sheet 2, either a hydrophobic fiber nonwoven fabric having a large number of openings or a plastic film having a large number of fine holes can be used. For the back sheet 3, any one of a breathable hydrophobic fiber nonwoven fabric, a breathable liquid-impervious plastic film, and a composite nonwoven fabric obtained by laminating breathable hydrophobic fiber nonwoven fabrics can be used. As the leak-proof sheet 12, either a composite nonwoven fabric obtained by laminating a breathable hydrophobic fiber nonwoven fabric or a composite sheet obtained by laminating a breathable hydrophobic fiber nonwoven fabric and a breathable liquid-impervious plastic film can be used.

  A composite nonwoven fabric (SM nonwoven fabric) obtained by laminating a fiber nonwoven fabric by a spunbond method having high strength and good flexibility on at least one side of a fiber nonwoven fabric by a melt blown method having high water resistance, on the back sheet 3 and the leak-proof sheet 12 SMS nonwoven fabric) can also be used.

  For the nonwoven fabrics forming the front and back sheets 2, 3 and the leak-proof sheet 12, the wing stretchable region 11, the tape fastener 19 and the target tape 25, each of spunlace, needle punch, meltblown, thermal bond, spunpond, and chemical bond What was manufactured by the manufacturing method can be used.

  The hydrophilic fiber nonwoven fabric can be made from any one of synthetic fibers, semi-synthetic fibers and regenerated fibers that have been subjected to hydrophilic treatment, or composite fibers obtained by mixing these fibers. The hydrophobic fiber nonwoven fabric can be made from synthetic fibers. The hydrophobic fiber nonwoven fabric may contain semi-synthetic fibers or regenerated fibers that have been subjected to water repellent treatment. Although there is no limitation in particular in a synthetic fiber, a polyester type, a polyacrylonitrile type, a polyvinyl chloride type, a polyethylene type, a polypropylene type, and a polystyrene type can be used. As the synthetic fiber, a core-sheath type composite fiber, a parallel type composite fiber, an atypical hollow fiber, a microporous fiber, and a bonded type composite fiber can also be used.

  It is preferable to use a hot melt adhesive as the adhesive. As the adhesive, in addition to the hot melt adhesive, either an acrylic adhesive or a rubber adhesive can be used. It is preferable that the adhesive is applied to the front and back sheets 2 and 3 and the leak-proof sheet 12 in any form of spiral, zigzag, dot, and stripe. When the adhesive is applied to the front and back sheets 2, 3 and the leak-proof sheet 12 in such a manner, the sheets 2, 3, 12 are intermittently fixed and the core 4 is intermittently fixed to the sheets 2, 3. In addition, the elastic members 16, 17, 22, and 28 are intermittently fixed to the sheets 2, 3, and 12.

  In the illustrated diapers 1 </ b> A and 1 </ b> B, the waist stretchable region 10 only needs to be formed at the end 8 of the rear waistline region 7 of the front and back waistline regions 5 and 7. As the first and second elastic members 16 and 22, thread-like members can be used. As the first and second elastic members 16 and 22, the leg-around elastic member 17, and the elastic member 28, any of natural rubber, synthetic rubber, and urethane foam can be used.

The partial fracture perspective view of a diaper shown as an example. The II-II line end view of FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 1. The partially broken perspective view of the diaper shown as another example. FIG. 6 is an end view taken along line VI-VI in FIG. 5. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5. VIII-VIII line end view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A Disposable diaper 1B Disposable diaper 2 Liquid-permeable surface sheet 3 Liquid-impermeable back sheet 4 Liquid-absorbent core 4a Both-ends edge 4b Both-sides edge 5 Front waist area 6 Inseam area 7 Rear waist area 8 Both-ends 9 Both-sides 10 Waist stretchable region 11 Wing stretchable region 16 First elastic member 18 Stretchable sheet 19 Tape fastener (fastening means)
22 Second elastic member 25 Target tape (fastening means)

Claims (6)

It has a front waist area and a back waist area in the vertical direction, and a crotch area located between these waist areas, a liquid-permeable surface sheet located on the skin contact side, and a skin non-contact side Liquid-impervious backside sheet, and a liquid-absorbent core interposed between the sheets and extending from the crotch region toward the front-rear waist region, and located outside the both end edges of the core In a disposable diaper having both ends extending in the lateral direction and both sides extending outside the both side edges of the core and extending in the vertical direction, and connecting the front and rear waist area via fastening means at the time of wearing,
The diaper is an elastically stretchable waist stretchable region extending laterally at least at an end of the rear waistline region of the front and back waistline regions, and laterally outward from both sides of the rear waistline region. Elastically stretchable wing stretchable area extending to the opposite sides of the rear waistline area, located between the waist stretchable area and the wing stretchable area, in the lateral direction of the wing stretchable area. The diaper characterized in that an elongation stress is larger than that in the lateral direction of the waist stretchable region, and the waist stretchable region does not stretch in the lateral direction before the wing stretchable region extends in the lateral direction. Stretchability in the lateral direction of the waist stretchable region is imparted by a first elastic member that is shrinkably attached to an end of the waistline region, and the wing stretchable region is separate from the front and back sheet. The diaper of Claim 1 currently formed from the elastic sheet. In the diaper, the first length dimension in the lateral direction of the waist stretchable area when the waist stretchable area is maximized in the lateral direction is defined as 100%, and the first length dimension is 90% until the first length dimension is 90%. When the waist stretchable region is stretched, the lateral stretch stress of the waist stretchable region is in the range of 0.5 to 3.0 N, and the second length dimension in the lateral direction when the wing stretchable region is not stretched is 100. %, And when the wing stretchable region is stretched until the second length dimension becomes 120%, the lateral extension stress of the wing stretchable region is in the range of 1.5 to 7.0 N, the second length The diaper according to claim 1 or 2, wherein a lateral extensional stress of the wing stretchable region when the wing stretchable region is stretched until the size reaches 150% is in a range of 3.0 to 10.0N. The diaper according to any one of claims 1 to 3, wherein both sides of the rear waist area are substantially inextensible. Both sides of the rear waist area can be elastically expanded and contracted, and the lateral elasticity of both sides of the rear waist area can be reduced by a second elastic member attached to the both sides so as to be shrinkable. The diaper according to any one of claims 1 to 3, wherein an applied lateral stress of the wing stretchable region is smaller than that of the lateral direction of both sides of the rear waistline region. In the diaper, the third length dimension of the both sides when the both sides of the rear waist area are extended to the maximum in the lateral direction is 100%, and the third length dimension is 90% until the third length dimension is 90%. The diaper according to claim 5, wherein when the both side portions are stretched, the lateral extension stress of the both side portions is in the range of 5 to 20N.

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