JP2013013580A - Disposable wearing article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable wearing article, in which the opening edge parts of legs are made to surely fit a wearer's body to prevent the displacement of the absorbent core and the lateral leakage of bodily fluids.SOLUTION: Side flaps 61 of an absorbent chassis 12 are provided with a plurality of streaks of leg elastic bodies 62 extending in a longitudinal direction Y. Crossover parts 70 of the side flaps 61 are formed with: fixed regions 75 secured to an elasticized waist panel 11; and free regions 76 positioned on the outside of the fixed regions 75 in a transverse direction X and not secured to the elasticized waist panel 11. Each of spacing dimensions R1, R3 in the transverse direction X between the adjacent leg elastic bodies 62 is in the range of about 3.0 to 10.0 mm, and a spacing dimension R2 in the transverse direction X between the side edge 45c of the absorbent core 45 and the innermost positioned elastic body 62a of the leg elastic bodies 62 is in the range of about 3.0 to 10.0 mm. Also, in spaced regions 69, 71 in the transverse direction X between the leg elastic bodies 62 in the side flaps 61, transverse wrinkles 68 of 9 to 20/50 mm are formed.

Description

  The present invention relates to a disposable wearing article, and more specifically, a disposable wearing article such as a disposable diaper in which a plurality of leg elastic bodies are arranged on a side flap, disposable toilet training pants, disposable incontinence pants, disposable sanitary pants, etc. About.

  Conventionally, disposable wearing articles in which leg elastic bodies are disposed along leg opening edges are known. For example, Patent Document 1 includes a chassis that forms an outer shape of a worn article, an absorbent core that is interposed in an inner and outer surface sheet that forms the chassis, and a leg elastic body that extends in a curved shape from a crotch region to a front and rear waist region of the chassis. A disposable wearing article is disclosed. Further, Patent Document 2 has an elastic waist panel and an absorbent chassis attached to the elastic waist panel, and the absorbent chassis extends straight along the leg opening edge in the longitudinal direction of the wearing article. A wearing article in which a leg elastic body is disposed is disclosed.

JP 2002-102278 A JP-T-2006-525858

  According to the wearing article disclosed in Patent Document 1, not only the leg opening edge but also a part of the front and rear waist region can be fitted to the wearer's body by the extension stress of the leg elastic body extending from the crotch region to the front and rear waist region. it can. On the other hand, according to the wearing article disclosed in Patent Document 2, the elastic waist panel extends in the waist direction so that the front and rear waist regions fit around the wearer's waist, and the absorbent chassis extends in the longitudinal direction of the wearing article. By being elongated, the leg opening edge can be fitted to the wearer's thigh.

  However, in the wearing article disclosed in Patent Document 1, the absorbent core is fixed inside the absorbent chassis, and the front and rear waist regions excluding the waist opening edge do not have stretchability. When the core absorbs bodily fluids and slides downward, even if it tries to lift it upward, the absorbent core cannot be pulled up to the required position, and the leg opening edge is separated from the wearer's groin. As a result, side leakage of body fluid may occur.

  On the other hand, in the wearing article disclosed in Patent Document 2, in the wearing state, the waist elastic body of the elastic waist panel extends in the direction around the waist, and the leg elastic body disposed on the side flap of the absorbent chassis that intersects with the waist elastic body By being stretched, even if the absorbent core absorbs body fluid, the absorbent chassis will not be greatly displaced. However, since the leg elastic body has a straight shape, the leg opening edge formed from the side flap cannot be fitted along the thigh or groin of the wearer having a curved shape. As a result, the side flaps may be sandwiched and deformed between the wearer's groin parts, causing side leakage of body fluids, or causing the misalignment of the absorbent chassis.

  Then, this invention makes it a subject to provide the disposable wear article which can prevent the position shift of an absorptive core and the side leakage of a bodily fluid by making a leg opening edge fit to a wearer's body reliably. .

  The present invention has a longitudinal direction and a transverse direction perpendicular thereto, a skin facing surface and a non-skin facing surface, a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, and the front and rear waists The present invention relates to a disposable wearing article including an annular elastic waist panel forming a region and an absorbent chassis attached to the elastic waist panel.

The present invention has the following structure.
The said absorptive chassis contains an absorptive core and the side flap extended in the said vertical direction in the lateral direction outward of the both-sides edge of the said absorptive core. The side flaps are provided with a plurality of leg elastic bodies extending in the longitudinal direction. The said leg elastic body is being fixed to the said side flap through the hot-melt-adhesive apply | coated to it. At the intersection of the side flaps with the elastic waist panel, it is not fixed to the elastic waist panel, which is fixed to the elastic waist panel and located laterally outward of the fixed portion. A free part is formed. The lateral dimension between the leg elastic bodies is about 3.0 to 10.0 mm, and the lateral direction between the side edge of the absorbent core and the innermost elastic body of the leg elastic bodies The spacing dimension of the side flaps is about 3.0 to 10.0 mm, and 9 to 20 pieces / 50 mm of lateral ribs are formed in the laterally spaced portions of the leg flaps of the side flaps.

  In one embodiment of the present invention, the leg elastic body is formed of an elastic yarn having an elongation ratio of about 2.6 to 3.5 times and a thickness of about 480 to 1030 dtex.

  In one embodiment of the present invention, the lateral length of the side flap is about 10.0 to 35.0 mm.

  In one embodiment of the present invention, the laterally spaced portions of the leg elastic bodies are separated from each other by an inwardly spaced portion located at a fixed portion of the side flap and an outward portion located at a free portion of the side flap. And a separation portion.

  In one embodiment of the present invention, in the front and rear waist region, a stretchable region that can be contracted in the lateral direction is formed, and the stretchable region has a plurality of strings or strands extending in the lateral direction. The waist elastic body is arranged, and a part of the waist elastic body and the leg elastic body intersect each other.

  In one embodiment of the present invention, a front-rear non-stretchable region is formed at a position facing the absorbent core in a central portion of the stretchable region of the front-rear waist region, and the lateral side of the rear non-stretchable region The length dimension in the direction is larger than the length dimension in the lateral direction of the front non-stretchable region.

  In one embodiment of the present invention, an elongation stress in a predetermined width of a region intersecting the intersecting portion of the side flap in the stretchable region is a predetermined portion of the portion where the leg elastic body is disposed in the intersecting portion. It is higher than the elongation stress in the width.

  In one embodiment of the present invention, the hot melt adhesive for fixing the leg elastic body to the side flaps is intermittent at a spacing of about 5.0 mm or less in the length direction of the leg elastic body. Applied.

  In one embodiment of the present invention, the hot melt adhesive for fixing the leg elastic body to the side flap is continuously applied in the length direction of the leg elastic body.

  According to the wearing article according to the present invention, the leg elastic body is disposed at the intersection of the side flaps with the elastic waist panel, and the fixed portion fixed to the elastic waist panel is not fixed to the elastic waist panel. A free part is formed. By forming the fixed part at the intersection, when the elastic waist panel is pulled up, the side flaps are lifted in response to it, and the vicinity of the side edge of the absorbent core is not separated from the body and slipped down. . In addition, since the free part is formed at the intersection, the leg opening edge that is continuous with it is brought into contact with the wearer's skin in a state where a large number of recumbent legs formed by the contraction of the leg elastic body are formed. Therefore, it is possible to reliably prevent the side leakage of body fluid.

The perspective view of the disposable diaper shown as an example of the disposable wearing article which concerns on 1st Embodiment of this invention. The partially broken expansion | deployment top view which looked at the state which peeled the side seam part of the diaper and extended in the front-back direction from the inner surface. The top view of the state which removed the absorptive chassis. FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. 2. The schematic cross section which follows the VV line of FIG. The enlarged view of the area | region enclosed by VI of FIG. The enlarged view of the area | region enclosed with VII of FIG.

  1 and 2, a diaper 10 has a longitudinal direction Y and a transverse direction X orthogonal thereto, and has a skin-facing surface, a non-skin-facing surface facing the skin, and an annular elastic waist panel 11 extending in the direction around the waist. And the absorptive chassis 12 attached to the skin opposing surface side of the elastic waist panel 11, the front waist region 13, the back waist region 14, and the crotch region 15 located between the front and rear waist regions 13 and 14 are included.

  The elastic waist panel 11 has an elastic belt function and includes a front waist panel 16 that forms the front waist region 13 and a rear waist panel 17 that forms the rear waist region 14. The front waist panel 16 has a horizontal rectangular shape defined by an inner edge 16a, an outer edge 16b, and both side edges 16c and 16d connecting the inner edge 16a and the outer edge 16. The rear waist panel 17 has substantially the same shape as the front waist panel 16 defined by an inner edge 17a, an outer edge 17b, and both side edges 17c and 17d extending between the inner edge 17a and the outer edge 17b. It is a horizontal rectangle. The opposite side edges 16c, 16d of the front waist panel 16 and the opposite side edges 17c, 17d of the rear waist panel 17 are overlapped with each other, and known means such as heat embossing in the seam portion 20 arranged intermittently in the longitudinal direction Y. The waist opening 21 and the pair of leg openings 22 are defined by various heat welding means such as processing and sonic.

  The front and rear waist panels 16 and 17 are respectively an inner layer sheet 23 positioned on the skin facing surface side, an outer layer sheet 24 positioned on the non-skin facing surface side, and a front and rear waist elastic body 25 interposed between the inner and outer layer sheets 23 and 24. , 26.

The inner and outer layer sheets 23 and 24 are liquid-impermeable SMS (spunbond / meltblown / spunbond) fiber nonwoven fabric, spunbond nonwoven fabric or air-through nonwoven fabric having a mass of 15 to 30 g / m ² , or a plastic sheet or a laminate sheet thereof. Etc. can be used. Both sheets 23 and 24 are joined by a hot melt adhesive applied to at least one inner surface or by the heat welding means.

  As shown in FIG. 2, a plurality of string-shaped or strand-shaped front waist elastic bodies 25 are arranged between the inner and outer layer sheets 23, 24 of the front waist panel 16 so as to be shrinkable in the lateral direction X. Therefore, the front waist panel 16 is elasticized at least in the lateral direction X.

  The front waist elastic body 25 includes a plurality of first elastic bodies 31 that extend in the lateral direction X along the outer edge 16b, and a plurality of first elastic bodies 31 that are positioned below the first elastic body 31 and extend in parallel therewith. A second elastic body 32, a third elastic body 33 positioned below and extending in parallel with the second elastic body 32, and a third elastic body positioned below the third elastic body 33 along the inner edge 16a. And a fourth elastic member 34 extending in the lateral direction X in parallel with the body 33. The first elastic body 31 forms a front waistband. The fourth elastic body 34 intersects the leg elastic body 62 described later.

  Specifically, the first elastic body 31 is an elastic material having a thickness of about 400 to 1200 dtex and an expansion ratio of 2.0 to 2.6 times, and the second elastic body 32 is a thickness of 350 to 1200 dtex and an expansion ratio of The elastic material of 1.8 to 2.6 times, and the third and fourth elastic bodies 33 and 34 can be made of an elastic material having a thickness of 300 to 950 dtex and an expansion ratio of 2.6 to 3.6 times.

  Between the inner and outer layer sheets 23, 24 of the rear waist panel 17, a plurality of string-shaped or strand-shaped rear waist elastic bodies 26 are disposed so as to be stretchable in the lateral direction X. By providing the rear waist elastic body 26, the rear waist panel 17 is elasticized at least in the lateral direction X.

  The rear waist elastic body 26 includes a plurality of fifth elastic bodies 35 extending in the lateral direction X along the outer edge 16b, and a plurality of rear waist elastic bodies 26 positioned below the fifth elastic body 35 and extending in the lateral direction X in parallel therewith. A sixth elastic body 36 of the strip, a plurality of seventh elastic bodies 37 positioned below the sixth elastic body 36 and extending in the lateral direction in parallel therewith, and positioned below the seventh elastic body 37; A plurality of eighth elastic bodies 38 extending in the lateral direction X in parallel with the seventh elastic body 37 along the edge 16a are configured. The fifth elastic body 35 forms a rear waistband. The eighth elastic body 38 intersects the leg elastic body 62 described later.

  Specifically, the fifth elastic body 35 is an elastic material having a thickness of about 350 to 1200 dtex and an expansion ratio of about 1.8 to 2.6 times, and the sixth elastic body 36 is a thickness of about 300 to 900 dtex and an expansion ratio. The elastic material of about 2.6 to 3.6 times, the seventh and eighth sex elements 37 and 38 are formed of an elastic material having a thickness of about 440 to 500 dtex and an expansion ratio of about 3.2 to 3.6 times. ing.

  Referring to FIG. 3, in the front waist region 13, a front upper waist stretchable region 40 </ b> A is formed in a region where the first elastic body 31 and the second elastic body 32 are disposed, and the third and fourth elasticity. In the region where the bodies 33 and 34 are disposed, a pair of front lower waist stretchable regions 40B is formed. In the rear waist region 14, a rear upper waist stretchable region 41 </ b> A is formed in a region where the fifth elastic body 35 and the sixth elastic body 36 are disposed, and the seventh elastic body 37, the eighth elastic body 38, and the like. In the region where is disposed, a pair of rear lower waist stretchable regions 41B are formed.

  Further, in the front waist region 13, the third and fourth elastic bodies 33, 34 that are in a stretched state between the front lower waist stretchable region 40 </ b> B are cut or removed, so that the third and A front non-stretchable region 42 in which the fourth elastic bodies 33 and 34 are not present is defined. Further, in the rear waist region 14, a part of the expanded seventh and eighth elastic bodies 37, 38 is cut or removed between the rear lower waist stretchable regions 41B, whereby an elastic body having contractility is obtained. A non-existing rear non-stretchable region 43 is defined. Incidentally, the front non-stretchable region 42 can be defined by snapping back by cutting the central portions of the third and fourth elastic bodies 33 and 34 in the extended state. Similarly, the rear non-stretchable region 43 can be defined by cutting the seventh and eighth elastic bodies 37 and 38 that are in an extended state at their central portions.

  As described above, the front and rear non-stretchable regions 42 and 43 are formed in the front and rear waist regions 13 and 14, so that the contraction force by the elastic body acts on the substantially central portion of the absorbent chassis 12 facing the regions 42 and 43. It will never be done. Therefore, the absorbent core 45 positioned inside the absorbent chassis 12 in the central portion is not absorbed by the wrinkles or deformation caused by the contraction force of these elastic bodies, and is stably worn. Can be brought into contact with a person's body.

  The length dimension in the longitudinal direction Y of the front non-stretchable area 42 and the length dimension in the longitudinal direction Y of the rear non-stretchable area 43 are substantially the same. However, the length dimension W1 in the lateral direction X of the front non-stretchable region 42 is about 55 to 90 mm, and the length dimension W2 in the lateral direction X of the rear non-stretchable region 43 is about 80 to 115 mm. It is larger than the former.

  Referring to FIGS. 2 and 5, the absorbent chassis 12 has a vertical rectangular shape defined by front and rear end edges 12 e and 12 f and both side edges 12 g and 12 h, and is attached to the inner surface of the front waist panel 16. 12A, a rear end portion 12B attached to the inner surface of the rear waist panel 17, and an intermediate portion 12C extending in the vertical direction Y between the front and rear end portions 12a and 12b.

  Referring to FIG. 3, the elastic waist panel 11 and the front and rear portions 12 </ b> A and 12 </ b> B of the absorbent chassis 12 are fixed via front and rear joining regions 50 and 51 formed on the opposing surfaces thereof. The front and rear joining areas 50 and 51 have a plurality of adhesive lines 52 extending in the longitudinal direction Y and formed by applying a hot melt adhesive. The length dimension (width dimension) in the lateral direction X of the bonding line 52 is about 3.0 to 10.0 mm, and the outermost bonding lines 52a and 52b located on both sides of the lateral direction X are absorbent chassis. 12 is located in the vicinity of both side edges of an absorbent core 45 to be described later constituting a part of 12. However, the front and rear joining regions 50 and 51 may have various known patterns such as an Ω shape, a spiral shape, and a wave shape in addition to a plurality of line shapes.

  The absorbent chassis 12 is interposed between a liquid-permeable inner surface sheet 53 positioned on the skin facing surface side, a hydrophobic covering sheet 54 positioned on the non-skin facing surface side, and the inner surface sheet 53 and the covering sheet 54. And an absorbent core 45. The absorbent core 45 has a panel shape in which the central portion in the longitudinal direction Y is recessed inward, and is entirely encapsulated by a liquid diffusible tissue or the like (not shown). Between the lower surface of the absorptive core 45 and the covering sheet 54, a leak-proof sheet 57 formed of a liquid-impermeable plastic film is disposed.

The absorbent core 45 is formed from a mixture of fluff pulp, superabsorbent polymer particles (SAP), and optionally heat-weldable staple fibers. In this embodiment, as will be described later, the side flap 61 does not bend or deform during wearing, and stably contacts the wearer's body, so that the absorbent core 45 is relatively thin. However, the absorbent core 45 itself is not bent or deformed, and the mass of the fluff pulp can be made lower than usual. In such a case, specifically, the mass of the fluff pulp can be about 150 to 250 g / m ² .

Cover sheet 54, the weight 10 to 30 g / ^{m 2} hydrophobic SMS (spunbond meltblown Suapanbondo) fibrous nonwoven fabric or a spun-bonded nonwoven fabric of weight approximately 15 to 30 g / ^{m 2,} or a plastic sheet, laminates thereof A sheet or the like can be used.

  The covering sheet 54 extends outward from the peripheral edge of the absorbent core 45, and the end flap 60 extending in the lateral direction X outward of the longitudinal direction Y of both end edges of the absorbent core 45 by the extended portion. And the side flap 61 extended in the vertical direction Y in the outward of the horizontal direction X of the both-sides edge of the absorptive core 45 is formed. A plurality of string-like or strand-like leg elastic bodies 62 extending in the longitudinal direction Y are fixed to the side flap 61 so as to be contractible in the longitudinal direction Y. Therefore, the side flap 61 and the leg elastic body 62 have a gasket cuff function that is in close contact with the wearer's leg.

  The leg elastic body 62 includes an inner leg elastic body 62a positioned on both side edges of the absorbent core 45, an outer leg elastic body 62b positioned on the side edge side of the side flap 61, and a central leg elastic body 62c positioned therebetween. And have.

  A part of both sides of the covering sheet 54 forming the side flap 61 is folded inward on the absorbent chassis 12, and a pair of sleeves 64 extending in the longitudinal direction Y are formed. A plurality of string-like or strand-like cuff elastic bodies 65 extending in the longitudinal direction Y are fixed in the sleeve 64 so as to be shrinkable in the longitudinal direction Y via a hot melt adhesive. The sleeve 64 is fixed to the skin-facing surface of the leak-proof sheet 57 via a fixing portion 66 formed by applying a hot melt adhesive, and forms a leak-proof cuff together with the cuff elastic body 65.

  For the leg elastic body 62 and the cuff elastic body 65, an elastic material made of natural rubber or synthetic rubber having a thickness of about 300 to 950 dtex and an expansion ratio of 2.2 to 3.2 times can be suitably used. In the present embodiment, the leg elastic body 62 is formed from three elastic materials and the cuff elastic body 65 is formed from two elastic materials, but may be formed from a plurality of elastic materials. Here, the expansion ratio is that the non-stretched state of the elastic material is 1.0 times. For example, when a 100 mm elastic material is stretched to 200 mm in the non-stretched state, the expansion ratio is 2 .0 times.

  The leg elastic body 62 is fixed between the covering sheet 54 and the leak-proof sheet 57 via a hot melt adhesive applied continuously or intermittently in the length direction. However, as long as the effects described later of the present invention are exhibited, the leg elastic body 62 was applied continuously or intermittently in the length direction of at least one of the facing surfaces of the covering sheet 54 and the leakage preventing sheet 57. It may be fixed via a hot melt adhesive. When the hot melt adhesive is intermittently applied directly to the leg elastic body 62 and when the hot melt adhesive is intermittently applied and fixed to both sheets 54 and 57, the separation dimension between the joint portions is about 5 It is preferable that it is 0.0 mm or less. In that case, more horizontal reeds 68 described later can be formed, and specifically, 9 or more horizontal reeds 68 are formed per length dimension 50 mm in the vertical direction Y of the side flap 61. The In order to more reliably form the required number of reeds 68, it is preferable to continuously apply a hot melt adhesive to the leg elastic body 62 in the length direction of the leg elastic body 62. In addition, as a coating method of the hot melt adhesive, a conventionally known one can be used. For example, in the case of intermittent coating, various spray coating methods such as spiral spraying can be used. In the case of applying to the hot melt adhesive, the hot melt adhesive can be applied to almost the entire periphery by passing the elastic member through a nozzle that elutes the hot melt adhesive.

  6 and 7, the length dimension (width dimension) of the side flap 61 in the lateral direction X, that is, the side edge 45c of the absorbent core 45 and the outer edge of the side flap 61 (the outer edge 12g of the absorbent chassis 12). ) In the lateral direction X is about 10.0 to 35.0 mm, more preferably about 12.0 to 30.0 mm. In addition, the length dimension (separation dimension) R1 in the lateral direction X of the outer separation portion 69 located between the outer leg elastic body 62b and the center leg elastic body 62c is more preferably about 3.0 to 10.0 mm. Is 4.0 to 8.0 mm, and the length dimension (separation dimension) R2 in the lateral direction X of the separation portion 70 located between the side edge 45c of the absorbent core 45 and the inner leg elastic body 62a is About 3.0-10.0 mm. The length dimension (separation dimension) R3 in the lateral direction X of the inwardly spaced portion 71 located between the inner leg elastic body 62a and the central leg elastic body 62c is about 3.0 to 10.0 mm, more preferably 4.0 to 8.0 mm. As described above, since the plurality of leg elastic bodies 62 are disposed on the side flap 61 with a relatively small separation dimension, the side flap 61 has a plurality of lateral portions extending in the lateral direction X as shown in FIG. A collar 68 is formed. Here, the inner and outer separation dimensions R1 and R3 between the leg elastic bodies 62 mean the distance between the central portions of the elastic bodies.

  In the present embodiment, the outer leg elastic body 62b and the outer edge of the side flap 61 are not separated from each other in the lateral direction X, but may be separated as long as the effects of the present invention described later can be obtained. In this case, however, the separation dimension is preferably 4.0 mm or less. When the separation dimension is 4.0 mm or more, the horizontal collar 68 is not formed between the outer side leg elastic body 62 c and the outer edge of the side flap 61, and the horizontal collar 68 is formed on the entire side flap 61. This is because the effect of giving rigidity and suppressing bending and deformation cannot be achieved.

  As shown in FIG. 6, the inner leg elastic body 62 a is positioned almost directly below the fixing portion 66 that forms the sleeve 64. As described above, the inner leg elastic body 62a is positioned almost directly below the fixing portion 66 of the sleeve 64, whereby the standing action of the barrier cuff is assisted by the contraction action, and the barrier cuff is separated from the wearer's body during wearing. Thus, it is possible to prevent the body from lying down on the inside and outside.

  In the front joining area 50 where the front end 12A of the absorbent chassis 12 and the front waist panel 16 are joined, the outermost bonding line 52a passes from the inside through the inner leg elastic body 62a and extends to the central leg elastic body 62c. Yes. Therefore, in the region where the leg elastic body 62 exists at the intersection 74 of the side flap 61, the fixed portion 75 fixed to the front waist panel 16 via the front joint region 50 and the free portion 76 extending outward in the lateral direction X are provided. And are formed.

  FIG. 7 is an enlarged view of a region surrounded by VII in FIG. In addition, although the following is description about only the front waist region 13 side of the diaper 10, it should be understood that the same applies to the rear waist region 14 side having the same configuration.

  As shown in FIG. 7, the side flaps 61 are formed with a plurality of horizontal ribs 68 that extend in the horizontal direction X when the leg elastic elements 62 contract. The leg elastic body 62 and the fourth elastic body 34 intersect each other at a part of the fixed portion 75 and the free portion 76, and the length dimension L1 in the longitudinal direction Y between the fixed portion 75 and the free portion 76 is about 15.0 to 40.0 mm. As described above, in the side flap 61, since a plurality of elastic bodies are disposed with a relatively small separation dimension, a relatively large number of horizontal rods 68 are formed. Relatively fine reeds 68 of 10-25 pieces / 50 mm are formed.

  In this way, a relatively large number of fine reeds 68 are formed on the side flap 61, and a free part 76 is formed at the intersection 74 between the front waist panel 16 and the absorbent chassis 12. Accordingly, there is no possibility that the front crotch edge 77 located on the front side of the crotch region 15 of the side flap 62 is sandwiched between the crotch of the wearer and the side leakage preventing function is hindered. That is, the portion 77 is usually located opposite to the wearer's groin, and when the side flap 61 has low rigidity, the portion 77 may be bent irregularly by the movement of the wearer's thigh or between the crotch. A part of the product is sandwiched, and the function as a gasket cuff cannot be sufficiently achieved.

  However, in the case of the present embodiment, the rigidity is increased by the fact that the outwardly spaced portion 69 is located in the portion 77 of the side flap 61 and a plurality of relatively fine reeds 68 are formed. Thus, the entire surface is not curled or sandwiched between the wearer's crotch, and the entire surface can be brought into close contact with the wearer's body. Further, at the intersection 74, the side flap 62 is stably fixed to the front waist panel 16 at the fixing portion 75 where the inwardly spaced portion 71 is located, and when the front waist panel 16 is extended in the lateral direction X, the side flap 62 is interlocked with it. And pulled in the lateral direction X. On the other hand, the free part 76 is in contact with the wearer's body while maintaining the shape in which the horizontal collar 68 is formed at the front crotch edge 77 without being interfered by the movement of the elastic waist panel 11.

  The horizontal collar 68 is also formed at the separation part 70 between the absorbent core 45 and the inner leg elastic body 62a having the same dimension as the separation dimension between the leg elastic bodies 62, so that the separation part 70 is relatively rigid. Thus, the absorbent core 45 is not likely to be bent or deformed by being sandwiched between the crotch of the wearer in the same manner as the side flap 61.

  Thus, since the side flap 61 is not bent in the vertical direction Y and can be brought into contact with the wearer's body in a state of spreading in the horizontal direction X, the free portion 76 of the side flap 62 is in the vicinity of the wearer's hipbone. Close to the opposite. Therefore, since the side flaps 61 and the absorbent core 45 are pulled up in conjunction with the front and rear waist regions 13 and 14 while being worn, the leakage of body fluid due to the sliding down of the absorbent core 45 is suppressed. Can do.

  Further, as described above, the length dimension W2 in the lateral direction X of the rear non-stretchable region 43 of the rear waist region 14 is larger than the length dimension W1 in the lateral direction X of the front non-stretchable region 42 of the front waist region 13. In the rear waist region 14, the side flaps 61 are located outside the front waist region 13 in the lateral direction X. The side flap 61 is made to be a relatively narrow groin portion of the wearer in the front waist region 13 by the improvement of the rigidity by the lateral flange 68 of the side flap 61 and the action by the intersection of the waist elastic bodies 25, 26 and the leg elastic body 62. The back waist region 14 can be in close contact with a relatively narrow buttocks. Moreover, without changing the structure itself of the absorptive chassis 12, that is, without changing the width dimension of the absorptive chassis 12 in the front and rear waist regions 13 and 14, the front and rear non-stretchable regions 42 and 43 are provided. Since the area of the portion of the side flap 61 that is in close contact with the skin of the wearer can be changed in the front and rear waist regions 13 and 14, it can be manufactured on a normal diaper manufacturing line, and the configuration of the absorbent chassis 12 itself It can be said that the manufacturing process is simple as compared with the case of changing.

<Measuring method of recumbent 68>
First, the diaper 10 is set in a state in which the seam portions 20 at both side edges are separated and deployed, and the leg elastic body 62 is extended by pulling the absorbent chassis 12 in the longitudinal direction Y to such an extent that the side flap 61 does not wrinkle. . Next, in the front crotch edge 77, a dot-like mark is put at a position 50 mm downward from the lower end edge 16a of the front waist region 13, and the point marked from the lower end edge 16a of the front waist region 13 is marked. The measurement area is defined as the measurement area, and a red line extending straight in the vertical direction Y is drawn at the center of each of the inner and outer separation parts 69 and 71 in the measurement area.

  The absorbent chassis 12 in such a state is left at room temperature (room temperature: about 18-22 ° C., relative humidity: 55-65%) for 24 hours, and then the absorbent chassis 12 is released from the state of being pulled in the longitudinal direction Y, and the leg The elastic body 62 is contracted. After leaving it for a while, the number of wrinkles extending in the horizontal direction X formed on the red line in the measurement area is counted. The same measurement is performed for a plurality of diapers 10 (n = 10), and the average of the number of ridges obtained from the measurement is set as the number of horizontal ridges 68. Here, “皺” in this measurement is one convex portion located between two concave portions in the inner and outer separated portions 69 and 71, and the width dimension in the lateral direction X is 0.5 mm or more. Means things.

  Further, at the intersection 74, the extension elastic force in a predetermined width of the lower front stretchable region 40B where the third and fourth elastic bodies 33, 34 of the front waist panel 16 are disposed is arranged by the leg elastic body 62 of the side flap 61. It is preferable that it is higher than the elongation stress in the predetermined width of the provided stretchable region. In this case, even if a downward force is applied to the absorbent chassis 12 due to the self-mass of the excrement after excretion, the downward movement and deformation of the side flap 61 are suppressed by the stretching force of the front waist region 13. The absorbent core 45 can maintain the outer shape.

  Specifically, the elongation stress at an elongation rate of 75% of the lower front stretchable region 40B is 0.72 N / 10 mm, and the stretch rate of the stretchable region where the leg elastic body 62 of the side flap 61 is disposed is 75%. The elongation stress is 0.52 N / 10 mm.

<Method for measuring elongation stress in each region>
The extension stress in the predetermined width of the lower front expansion / contraction area 40B and the extension stress in the predetermined width of the expansion / contraction area where the leg elastic body 62 of the side flap 61 is disposed are a tensile tester (autograph tester manufactured by Shimadzu Corporation, (Product No .: AG-X10plus) is measured by the following method.

  First, the elastic waist panel 11 is cut out from the diaper 10, and the third and fourth elastic bodies 33 and 34 are extended in a state where the cut elastic waist panel 11 is extended in the waistline direction. The front stretchable region 40B is cut out to a width of about 10.0 mm (width dimension in the lateral direction X) to obtain a sample 1 (including a part of the front waist panel 16 and a part of the absorbent chassis 12). The length at is the length at maximum elongation (100%). Next, the absorbent chassis 12 is removed from the diaper 10 different from the diaper 10 from which the elastic waist panel 11 has been cut off, and the sleeve 64 (including the cuff elastic body 65) is removed from the side flap 61 of the removed absorbent chassis 12. After the removal, the side flap 61 is stretched so as not to be wrinkled in the longitudinal direction Y, cut to a width of about 10.0 mm (width dimension in the longitudinal direction Y), and set as the sample 2, and its length is set to the maximum length (100 %) Length. Next, the collected samples 1 and 2 are loaded on the chuck of the tensile tester, respectively, and a one-cycle test is performed in which the moving speed is 100 mm / min and the inversion distance is 85% of the maximum extension of the samples 1 and 2. The stress after reversal of the point at which the length of each sample 1 and 2 reaches 75% of the maximum elongation is measured and obtained. Such measurement is performed at least 10 times using a plurality of diapers 10, and the average value is defined as each elongation stress (N / mm). If it is difficult to collect the samples 1 and 2 with a width of 10.0 mm from the overall size of the diaper 10, the measurement is performed at an arbitrary width, and the elongation stress is obtained by converting to a width of 10.0 mm. .

  Further, the front non-stretchable region 40 of the front waist panel 16 is formed at a position facing the central portion of the absorbent core 45, so that the thickness of the absorbent core 45 is relatively thin. Also, it can be stably brought into contact with the wearer's body without deformation. Therefore, for example, the total amount of fluff pulp forming the absorbent core 45 can be reduced, whereby the diaper 10 as a whole is excellent in flexibility, and costs can be reduced by reducing raw materials.

<Measurement of side flap shrinkage>
Table 1 below compares the shrinkage ratio of the side flap 61 between the example of the present invention and Comparative Examples 1 and 2. In addition, the structure of the diaper used for the Example and Comparative Examples 1 and 2 and its constituent materials are the same except for those described in Table 1 and below. In addition, regarding the description regarding the following main measurement, the width dimension means the length dimension in the lateral direction X.

<Example>
As shown in Table 1, in the embodiment, three leg elastic bodies 62 having an expansion ratio of 2.7 times and a thickness of about 780 dtex are arranged on the side flap 61, and the leg elastic bodies 62 are slit. It fixes to a sheet | seat member through the hot-melt-adhesive apply | coated to the shape. The width dimension W3 of the side flap 61 is about 15.0 mm, the width dimension R2 of the separation portion 70 between the side edge 45c of the absorbent core 45 and the inner leg elastic body 62a is about 5.0 mm, and the inner and outer separation portions 69 and 71 are separated. The width dimensions R1 and R3 are about 5.0 mm.
<Comparative Example 1>
In Comparative Example 1, three leg elastic bodies 62 having an expansion ratio of 2.7 times and a thickness of about 470 dtex are disposed on the side flap 61, and the hot melt bonding is performed by applying the leg elastic bodies 62 in a slit shape. It fixes to a sheet | seat member through an agent. The dimensions W3, R1, R2, and R3 are 27.5 mm, 6.0 mm, 8.5 mm, and 13.0 mm, respectively.
<Comparative example 2>
In Comparative Example 2, three leg elastic bodies 62 having an expansion ratio of 2.5 times and a thickness of about 620 dtex are arranged on the side flap 61, and the hot melt bonding is performed by applying the leg elastic bodies 62 in a slit shape. It fixes to a sheet | seat member through an agent. The dimensions of W3, R1, R2, and R3 are 27.5 mm, 7.0 mm, 10.5 mm, and 10.0 mm, respectively.

  Under the above conditions, the diapers of Examples and Comparative Examples 1 and 2 were worn by 10 people (5 men and women), and the width dimension of the side flap 61 after 10 minutes had elapsed after wearing. Using the measured width dimension W3 (mm) of the side flap 61 before wearing, the width dimension W3 (mm) of the side flap 61 before wearing ÷ the width dimension W3 (mm) of the side flap 61 after wearing is obtained, and each diaper The values obtained with respect to were averaged to obtain the shrinkage rate (%) of the side flap 61.

  As shown in Table 1, in the embodiment, 13 horizontal rods 68 are formed in both the outer space portion 69 and the inner space portion 71. As described above, since the plurality of fine wrinkles are uniformly formed in the inner and outer spaced portions 69 and 71, the front crotch edge 77 of the side flap 61 has a planar shape as a whole, and the contraction rate of the side flap 61 is 13. %Met. On the other hand, in Comparative Example 1, nine lateral ribs are formed in the outer separation portion 69 and six lateral ridges are formed in the inner separation portion 71, and the contraction rate of the side flap 61 is 52%. In Comparative Example 2, the outer separation portion is formed. 69 and 68 are formed in each of the inwardly spaced portion 71 and the side flap 61 has a contraction rate of about 39%. As described above, in Comparative Examples 1 and 2, the contraction rate of the side flap 61 is higher than that of the example, and the surface shape cannot be maintained. Therefore, the diaper 10 is folded between the wearer's crotch in the wearing state. There is a risk of bending or deformation.

  In Comparative Examples 1 and 2, the reason why the shrinkage rate of the side flap 61 is higher than that in the example is that, in Comparative Example 1, the leg elastic body 62 has a thickness of about 470 dtex, as is apparent from the visual inspection. Thus, since only six horizontal ribs 68 are formed in the relatively wide inwardly spaced portion 71 and become a relatively large convex portion, the rigidity is lower than that of the outwardly spaced portion 69 and the surface tends to shrink. Further, in Comparative Example 2, the expansion ratio of the leg elastic body 62 is 2.5 times, which is lower than that of the Example and Comparative Example 1, and the inner and outer spaced portions 69 and 71 are not. It is conceivable that a relatively small number of reeds 68 were formed.

  From these measurement results and comparative studies, by forming a plurality of fine reeds 68 on the side flap 61, the rigidity becomes relatively high, without being partly curled or sandwiched between the wearer's crotches, In order to achieve the effect of the present invention that it can be brought into close contact with the wearer's body in a planar shape, the leg elastic body 62 has an expansion ratio of about 2.6 to 3.5 times and a thickness of about 480 to 1030 dtex. In addition, it can be said that it is preferable that 9 to 20 pieces / 50 mm of horizontal ribs 68 are formed in the separation portions R1 and R3 between the leg elastic bodies 62.

  In addition to the materials described in the present specification, various known materials that are usually used in this type of article can be used without limitation for the respective constituent members constituting the diaper 10. In the specification of the invention and the claims, the terms “first” and “second” are used merely to distinguish similar elements, positions, and the like.

10 Disposable diapers (disposable wearing articles)
11 elastic waist panel 12 absorbent chassis 13 front waist region 14 rear waist region 15 crotch region 25 front waist elastic body 26 rear waist elastic body 42 front non-stretchable region 43 rear non-stretchable region 61 side flap 62 leg elastic body 62a inner side leg elasticity Body 68 Recumbent 69 Spacing part of outer leg elastic body and central leg elastic body (outer spacing part)
70 Separation part 71 of inner leg elastic body and side edge of absorbent core 71 Separation part (inner separation part) of inner leg elastic body and central leg elastic body
74 Crossing part 75 Fixing part 76 of the side flap crossing part Free part R1 of the side flap crossing part Separation dimension R2 of the outer separation part In the lateral separation dimension R3 between the inner leg elastic body and the side edge of the absorbent core Side dimension W3 Side flap lateral dimension W1 Front non-stretchable area lateral dimension W2 Rear non-stretchable area lateral dimension X Horizontal direction Y Vertical direction

Claims (9)

It has a longitudinal direction and a transverse direction perpendicular thereto, and forms a skin facing surface and a non-skin facing surface, a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, and the front and rear waist regions. In a disposable wearing article comprising an annular elastic waist panel and an absorbent chassis attached to the elastic waist panel,
The absorbent chassis includes an absorbent core, and side flaps extending in the longitudinal direction at lateral outer sides of both side edges of the absorbent core,
The side flap is provided with a plurality of leg elastic bodies extending in the longitudinal direction,
The leg elastic body is fixed to the side flap via a hot melt adhesive applied to the leg elastic body,
At the intersection of the side flaps with the elastic waist panel, it is not fixed to the elastic waist panel, which is fixed to the elastic waist panel and located laterally outward of the fixed portion. A free part is formed,
The lateral dimension between the leg elastic bodies is about 3.0 to 10.0 mm, and the lateral direction between the side edge of the absorbent core and the innermost elastic body of the leg elastic bodies The spacing dimension of the side flaps is about 3.0 to 10.0 mm, and 9 to 20 pieces / 50 mm of reeds are formed in the laterally spaced portions of the leg flaps of the side flaps. The said wearing article characterized by these.   The wearing article according to claim 1, wherein the leg elastic body is formed of an elastic yarn having an elongation ratio of about 2.6 to 3.5 times and a thickness of about 480 to 1030 dtex.   The wearing article according to claim 1, wherein a length dimension of the side flap in the lateral direction is about 10.0 to 35.0 mm.   The separation part in the said horizontal direction of the said leg elastic bodies contains the inward separation part located in the fixed part of the said side flap, and the outward separation part located in the free part of the said side flap. Wearing articles.   In the front and rear waist region, a stretchable region that can shrink in the lateral direction is formed, and in the stretchable region, a plurality of string-like or strand-like waist elastic bodies extending in the transverse direction are arranged, The wearing article according to claim 1, wherein a part of the waist elastic body and the leg elastic body intersect.   A front / rear non-stretchable region is formed at a position facing the absorbent core in a central portion of the stretchable region of the front / rear waist region, and a length dimension in the lateral direction of the rear non-stretchable region is the front non-stretchable The wearing article according to claim 5, which is larger than a length dimension of the region in the lateral direction.   The elongation stress in a predetermined width of a region intersecting the intersecting portion of the side flap in the stretchable region is higher than an elongation stress in a predetermined width of a portion of the intersecting portion where the leg elastic body is disposed. Wearing article as described in.   The hot melt adhesive for fixing the leg elastic body to the side flaps is intermittently applied at a separation interval of about 5.0 mm or less in the length direction of the leg elastic body. The wearing article as described.   The wearing article according to claim 1, wherein the hot melt adhesive for fixing the leg elastic body to the side flap is continuously applied in a length direction of the leg elastic body.

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