JP6426756B2 - Disposable diapers - Google Patents

Description

  The present invention relates to disposable diapers.

  BACKGROUND Conventionally, disposable diapers using an elastic stretchable sheet are known. For example, in the invention disclosed in Patent Document 1, the back sheet is formed by the non-stretchable outer layer located on the non-skin contact surface side and the stretchable inner layer located on the skin contact surface side. Both layers are fixed by means of intermittently applied embossing.

JP 10-99373 A

  In the invention disclosed in Patent Document 1, the non-stretchable layer has an outwardly convex loop-like crease between the portion pressed against the inner layer by embossing, and the surface is usually flat. It is superior in touch and flexibility as compared to conventional sheet members.

  However, it is embossed with a substantially uniform pattern in the front and rear waist area and the crotch area, and the stretchability in the entire diaper area is constant. Therefore, if stretch stress in the waist circumference direction is made relatively high in order to exert the holding power to the waist area of the wearer, the crotch area bites into the thigh base and impairs the feeling of wearing, As a result, a part of the buttocks may be exposed to cause leakage of excrement. On the other hand, when the stretching stress in the waist circumference direction is relatively low in order to avoid such a situation, the fit in the front and rear waist regions is reduced, and displacement tends to occur during wearing.

  Therefore, according to the present invention, the elastic sheet is disposed in each of the front and rear waist area and the crotch area, the expansion rate of the crotch area is lower than that of the front and rear waist area, and the buttocks of the wearer can be covered. It is an issue to provide a disposable diaper that is excellent in feeling.

  The present invention is directed to a disposable diaper having a longitudinal direction and a lateral direction, a skin-facing surface and a non-skin-facing surface, a front waist region, a rear waist region, and a crotch region located between the front and rear waist regions.

In the disposable diaper according to the present invention, the front and rear waist regions and the crotch region are elastically stretchable at least in the lateral direction by being formed from an elastic sheet, and the front and rear waist regions have high elasticity regions. A low modulus region is located at a central portion of the crotch region, the elastic modulus in the lateral direction being lower than the high modulus region, and the modulus of elasticity in the low modulus region is 1.5 to 2.1 times is there.
In the present invention, unless otherwise stated, the term "elastic" means the property of elastic elongation by tension and elastic contraction when the tension is released.

  According to the disposable diaper of the present invention according to one or more embodiments, the front and rear waist regions and the crotch region are each formed of an elastic sheet, so that the touch is good and along the body. It can be worn and has excellent fit. Also, by positioning the low elasticity region at the center of the crotch region, the front and rear waist regions have a predetermined holding power, while the crotch region shrinks and is not caught between the thigh roots and the hips are not exposed. Because the entire buttocks of the wearer can be covered widely, the feeling of wearing is excellent.

The drawings illustrate certain embodiments of the present invention according to the present disclosure and include not only the essential features of the invention, but also optional and preferred embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of a diaper shown as an example of the disposable diaper of this invention. The partially broken development top view of the diaper extended to a longitudinal direction and the horizontal direction to the time of the largest expansion of each elastic material which comprises a diaper (The extent to which the gather by the shrinkage | contraction effect | action of an elastic material becomes invisible). (A) Typical sectional drawing in alignment with the III (a)-III (a) line of FIG. 2, (b) Typical sectional drawing in a wearing state. The top view which showed the aspect of the junction area of a liquid absorption structure which shows a base panel with an imaginary line. The top view of a base panel. (A) A partially enlarged view of the area surrounded by VI (a) in FIG. 1 in the unworn state of the diaper; (b) one of the areas surrounded by VI (b) in the FIG. Part enlarged view. (A) The partially enlarged view similar to FIG. 6 (a) in the wearing condition of a diaper. (B) The partially enlarged view similar to FIG.6 (b) in the wearing condition of a diaper. The rear view of the diaper in a wearing condition. The top view in the modification of a diaper. The top view in the other modification of a diaper.

  The following embodiment relates to the disposable diaper shown in FIGS. 1 to 10, and includes not only the essential configuration of the invention but also optional and preferable configurations.

  1 to 3, the diaper 10 shown as an example of the disposable diaper according to the present invention has a longitudinal direction Y and a transverse direction X orthogonal thereto, and a transverse direction along the longitudinal center line P and the transverse direction X along the longitudinal direction Y A center line Q, a skin contact surface side and a non-skin contact surface side opposite to it, a front waist region 11, a rear waist region 12, and a crotch region 13 located between the front and rear waist regions 11 and 12 . The diaper 10 includes a base panel 20 having an outer shape, and a liquid absorbent structure 30 located on the skin contact surface side of the base panel 20. The longitudinal center line P bisects the dimension of the diaper 10 in the lateral direction X, and the transverse center line Q bisects the dimension of the diaper 10 in the longitudinal direction Y. The diaper 10 has a symmetrical shape with respect to the longitudinal center line P.

  The base panel 20 is elastically stretchable in at least the lateral direction X, and both sides extend in the longitudinal direction Y between the front and rear end edges 20a and 20b extending in the lateral direction X and the front and rear end edges 20a and 20b. It is defined from the edges 20c and 20d. The side edges of the base panel 20 (the side edges of the diaper 10) are concavely shaped in the crotch area 13 to fit along the wearer's thighs. Further, the side edges of the front waist region 11 and the side edges of the rear waist region 12 are connected by a plurality of side seams 16 formed intermittently in the longitudinal direction, whereby the waist opening 17 and the pair of A leg opening 18 is defined. The side seams 16 can use known heat welding means such as heat seal and ultrasonic seal, in addition to known adhesives such as hot melt adhesive.

  The base panel 20 is a liquid-impervious, moisture-permeable, elastic inner layer sheet 21 located on the skin contact side, and a liquid-impervious, moisture-permeable, non-elastic outer layer sheet 22 located on the non-skin contact side including. A string-like or strand-like multiple-leg elastic body attached with an adhesive, for example, a hot-melt adhesive, between both sheets 21 and 22 along both side edges (leg opening edges) 20c and 20d of the crotch area 13. 24 are provided. As a result, gasket cuffs 20 e for preventing leakage of excrement are formed on both side areas of the base panel 20. Although various known adhesives can be used without limitation for the hot melt adhesive for fixing the leg elastic body 24, no solvent is contained in order to minimize the elasticity of the inner layer sheet 21 as much as possible. It is preferable to use a rubber-based adhesive, for example, an SBS (styrene-butadiene-styrene) -based or SIS (styrene-isoprene-styrene) -based adhesive.

  The inner layer sheet 21 may be an elastic fiber nonwoven fabric manufactured by various known manufacturing methods such as a spunbond nonwoven fabric made of elastic fiber filaments, an air through nonwoven fabric, a needle punched nonwoven fabric and the like. The elastic fiber can be melt-spinning using an extruder, like a normal thermoplastic resin, when using thermoplastic elastomer or rubber as a raw material, especially when using thermoplastic elastomer as a raw material, and so on The fiber obtained is easy to be heat-fused and is suitable as an elastic fiber non-woven fabric. Styrene-based elastomers such as SBS (styrene-butadiene-styrene), SIS (styrene-isoprene-styrene), SEBS (styrene-ethylene-butadiene-styrene), SEPS (styrene-ethylene-propylene-styrene) as thermoplastic elastomers And olefin elastomers, polyester elastomers and polyurethane elastomers. These can be used singly or in combination of two or more. Also, core-sheath or side-by-side composite fibers made of these resins can be used.

  The inner layer sheet 21 formed of such an elastic fiber non-woven fabric has elasticity in at least the lateral direction X in the longitudinal direction Y and the lateral direction X. Therefore, the composite sheet in which the inner layer sheet 21 and the outer layer sheet 22 are joined is elastically stretchable in at least the lateral direction X. As long as the entire diaper 10 is elastically expandable in the lateral direction, not the inner layer sheet 21 but the outer layer sheet 22 may have elasticity, or both the sheets 21 and 22 may have elasticity.

  The outer layer sheet 22 is formed of various known fiber non-woven fabrics such as non-elastic air-through non-woven fabric or spunbond non-woven fabric using thermoplastic synthetic fibers such as polyethylene fibers and polypropylene fibers. The outer layer sheet 22 can also be formed from a sheet having inelasticity. As the non-elastic sheet, for example, various known fiber non-woven fabrics and plastic films such as spunbond non-woven fabric or SMS (spunbond, meltblown, spunbond) non-woven fabric and the like are subjected to gear drawing processing and slit processing known in the art. Thus, it is possible to use one having a predetermined elastic stretchability in the longitudinal direction Y and / or the transverse direction X.

  The dimension of the longitudinal direction Y of the outer layer sheet 22 is larger than that of the inner layer sheet 21, and an extension portion (folded portion) 22a located on the outer side in the longitudinal direction Y from the front and rear end edges of the inner layer sheet 21 of the outer layer sheet 22 Is bent inward along the front and rear end edges and fixed to the inner layer sheet 21. A plurality of thread-like, string-like or strand-like waist elastics 23 extending along the waist opening are attached between the bent portion 22a and the inner layer sheet 21 in an expandable manner and contractible.

  The waist elastic body 23 and the leg elastic body 24 may be formed from a composite sheet of elastic yarn and a non-stretchable fiber non-woven fabric or an elastic fiber non-woven fabric instead. Furthermore, when the leg elastic body 24 is formed of an elastic panel separate from that attached to the base panel 20, the free side extending outward in the lateral direction X from the side edges 20c and 20d of the base panel 20. The edge may be formed.

  The inner layer sheet 21 and the outer layer sheet 22 are formed by a plurality of first and second bonding portions 44 and 45 defined from a known adhesive such as a heat welding means by ultrasonic processing or heat seal processing or a hot melt adhesive. It is fixed to each other. The inner and outer layer sheets 21 and 22 are joined to each other by the first joint portion 44 forming a dot pattern in the front and rear waist regions 11 and 12 to define a high elastic region 41 and form an intermittent line pattern in the crotch region 13 The low elasticity region 42 is defined by being fixed to each other by the second joint 45. In the present embodiment, the first and second bonding portions 44, 45 are defined by heat welding means, and at least one synthetic resin component of the inner and outer layer sheets 21, 22 is solidified by melting and integrated with each other.

  The liquid-absorbent structure 30 has a vertical rectangular shape, and has a liquid-permeable body-side liner 31, a liquid-impervious covering sheet 32, and an absorbent body 34 interposed between both sheets 31 and 32; It includes a leakproof sheet 36 disposed between the absorber 34 and the covering sheet 32. The absorbent body 34 has front and rear end edges, and both side edges concaved between the front and rear end edges, and extends to the front and rear waist areas 11 and 12 around the crotch area 13. The absorbent body 34 is formed of a mixture of pulp fibers and superabsorbent polymer particles (SAP), and has a semi-rigid absorbent core shaped in the required shape and a liquid-permeable one covering the absorbent core. And a cover sheet which is formed from a sheet or the like and holds the core. The leakproof sheet 36 is preferably formed of a liquid-impervious and moisture-permeable plastic film or fibrous non-woven fabric having a size that covers the entire bottom surface of the absorber 34. Although not shown, an intermediate sheet formed of a liquid-permeable fibrous non-woven fabric is optionally disposed between the body-side liner 31 and the absorber 34 in order to improve cushioning properties and liquid diffusion properties. May be The liquid suction structure 30 has an end flap 30a located outside the longitudinal direction Y of the front and rear end edges of the absorber 34, and a side flap 30b located outside the lateral direction X of both side edges of the absorber 34. The liquid suction structure 30 is joined to the base panel 20 by a front and rear joint area located at the front and rear end portions.

  The covering sheet 32 forms barrier cuffs 32 a on both sides extending in the lateral direction X from the both side edges of the absorbent body 34. The barrier cuffs 32a have a proximal edge formed by fixing the overlapped portions bent to the longitudinal center line P and one of the end flaps 30a fixed to the body side liner 31 in the front and rear waist regions 11 and 12 And a distal edge formed by bending and fixing a part of the covering sheet 32 in a sleeve shape. A plurality of string-like or strand-like first barrier cuff elastics 37 extending in the longitudinal direction Y are attached to the proximal edge in an expandable and contractible manner. On the distal edge, a string-like or strand-like second barrier cuff elastic body 38 extending in the longitudinal direction Y is stretchably fixed in a contractible manner.

  The barrier cuffs 32a are separated from the skin-facing surface of the body-side liner 31 toward the wearer by the contracting action of the second barrier cuff elastic body 38 in the worn state of the diaper 10 to prevent the side leakage of the excrement. In addition, the proximal edge of the barrier cuffs 32a is resiliently adhered to the inside of the wearer's thigh by being separated from the gasket cuffs 20e toward the wearer by the contraction action of the first barrier cuff elastic body 37. Has a gasket function. As described above, the sheet forming the barrier cuffs 32a and the sheet forming the second gasket cuffs may be separated, and the second gasket cuffs may be disposed at predetermined positions.

  Referring to FIG. 4, the liquid suction structure 30 and the base panel 20 are bonded to each other by a bonding area 50 located on the skin facing surface of the base panel 20. The bonding area 50 includes a front bonding area 51 for fixing the front end of the liquid absorption structure 30, a rear bonding area 52 for fixing the rear end of the liquid absorption structure 30, and the liquid absorption structure 30. And an intermediate bonding area 53 for fixing the middle part. The front and rear bonding areas 51 and 52 are respectively narrow toward the crotch area 13 along the narrow horizontal portion extending in the horizontal direction X along the front and rear end edges of the liquid absorbent structure 30 and the longitudinal center line P. It has longitudinal portions 51a and 52a of width. Longitudinal portions 51a and 52a of the front and rear joint regions 51 and 52 and an intermediate joint region 53 shorter than these are located in the presence area of the absorber 34, and both are located inside the side edges of the absorber 34. ing. As described above, since the liquid absorbing structure 30 is not entirely bonded to the base panel 20, the diaper 10 is flexible in the presence region of the liquid absorbing structure 30 as compared to the case where the whole is bonded. Will not be lost. The bonding area 50 is a thick solid line (solid line) or a solid line with a width (solid stripe), and the shape and size of the solid line or the occupancy ratio to the opposing surface of the liquid absorption structure 30 and the base panel 20 It is appropriately set in consideration of fixation stability to the liquid structure 30 and the base panel 20, and is not limited to the illustrated example.

  5 is a plan view of the base panel 20, and FIG. 6 (a) is a partially enlarged view of a region encircled by line VI (a) of FIG. 1 when the diaper 10 is not worn (contracted). (A) is a figure similar to Fig.6 (a) in the wearing state (extension state) of the diapar 10. FIG.

Referring to FIG. 5, FIG. 6A and FIG. 7A, in the high elastic region 41, a plurality of dot-shaped first bonding portions 44 disposed in a scattered manner are located. The first joint portion 44 is substantially rectangular with an area of about 10 to 20 mm ² . In the first to third rows K1 to K3 arranged in the longitudinal direction Y and formed from the first joint portion 44, regarding the dimensions in the state where the diaper 10 is stretched, the separation dimension in the lateral direction X of each row R1 is about 1.5 to 2.5 mm, and the separation dimension R2 of the first bonding portions 44 in each row in the longitudinal direction Y is about 3.0 to 7.0 mm. The first junctions 44 of adjacent rows in the lateral direction X are not aligned in the lateral direction X, but are aligned in the lateral direction X (the first junctions 44 of the first row K1 and the third row) The separation dimension R3 between the first bonding portions 44) of K3 is about 3.0 to 5.0 mm. In addition, non-junction zones 48 in which the first junctions 44 are not arranged in the lateral direction X are located between the first junctions 44 in each row.

  6 (b) is a partially enlarged view of a region surrounded by the line VI (b) of FIG. 1 in a non-wearing state (contracted state) of the diaper 10, and FIG. 7 (b) is a wearing state of the diaper 10 6 (b) in the stretched state).

  Referring to FIGS. 5, 6 (b) and 7 (b), in the low elasticity region 42, a plurality of straight second junctions spaced apart by given dimensions in the longitudinal direction Y and the transverse direction X The part 45 is located. The second joint portion 45 has a first end 45 a and a second end 45 b which are separated in the longitudinal direction Y. Regarding each dimension of the second bonding portion 45 in a state where the diaper 10 is stretched, the dimension (long dimension) L1 in the longitudinal direction Y is about 1.0 to 3.0 mm. In the first to third rows J1 to J3 arranged in the longitudinal direction Y, formed from the plurality of second bonding portions 45, the separation dimension R4 in the lateral direction X of each row is about 1.5 to 3.5 mm, each The separation dimension R5 in the longitudinal direction Y between the second bonding portions 45 in the row is about 1.0 to 3.0 mm.

  The second bonding portions 45 in adjacent rows in the lateral direction X are not aligned in the lateral direction X, and the length dimension L1 of the second bonding portions 45 is aligned in the longitudinal direction Y in each of the rows J1 to J3. The second joint 45 (the second joint 45 in the first row J1 and the second joint J2 in the first row J1) is substantially the same as or larger than the separation dimension R5 between the second joints 45. The non-junction zone 48 is not formed between the junctions 45) like the high elastic zone 41.

  As described above, in the high elasticity region 41, unlike the low elasticity region 42, the non-joining zone 48 in which the second joint portion 45 does not exist in the lateral direction X is formed. The length dimension in the transverse direction X of the non-joining zone 48 is preferably the same as the dimension in the transverse direction X of the front and rear waist regions 11 and 12 and becomes larger than at least the separation dimension R3 between the first junctions 44 ing. The separation dimension R3 in the lateral direction X of the first bonding portion 44 and the separation dimension R6 in the lateral direction X of the second bonding portion 45 are substantially the same, and the high elastic region 41 and the low elastic region The elasticity with 42 is different. That is, in the non-joining zone 48, since the high and low elasticity areas 41 and 42 are not formed in the entire lateral direction X of the front and rear waist areas 11 and 12, the elasticity of the inner layer sheet 21 is not suppressed. It becomes easier to stretch and contract than the region where the joint portion 44 is disposed. On the other hand, in the low elastic region 42, the dimension R6 in the lateral direction X of the non-joining region is relatively small, and the elasticity of the inner layer sheet 21 in the lateral direction X is suppressed by the second bonding portion 45. Therefore, the front and rear waist regions 11 and 12 in which the high elasticity region 41 is located are elastically stretched more easily than the crotch region 13 in which the low elasticity region 42 is located, and the elongation rate thereof is higher than the elastic elongation rate of the crotch region 13 Get higher.

  Referring to FIG. 8, in the worn state of the diaper 10, the crotch area 13 covers the entire buttocks of the wearer. Generally, the front and rear waist regions 11 and 12 require elasticity to exhibit a certain holding power (hold power) around the waist of the wearer in order to prevent the positional displacement of the diaper 10, with regard to the crotch region 13 When the same elasticity is given, the rear crotch opening edge (two-dot chain line 113b in FIG. 8) may bite into the thigh root to expose the buttocks. Also, even if the leg elastic gives elasticity only to the leg opening edge to improve the fit around the leg opening, if the entire crotch area 13 does not have elasticity, it covers so as to wrap the entire heel part. It is not possible.

  In the diaper 10 according to the present embodiment, the elastic elongation in the lateral direction X of the crotch area 13 is lower than the elastic elongation in the lateral direction X of the front and rear waist areas 11 and 12. When worn, the front and rear waist areas 11 and 12 are elastically stretched and stably held in the waist circumference direction along the waist of the wearer, while the crotch area 13 is not excessively shrunk. The dimensions at the time of design can be substantially maintained, and the entire buttocks can be covered and covered.

  Referring again to FIGS. 2 and 3A and 3B, the base panel 20 has an extended portion 55 extending outward in the lateral direction X from the liquid absorbent structure 30 in the entire crotch area 13. . As described above, since the base panel 20 extends outward from the side edges of the liquid absorbent structure 30 in the lateral direction X, the liquid absorbent structure 30 is covered by the base panel 20 so as to cover the entire crotch area 13. As shown in FIG. 3 (b), even when the diaper 10 is worn, the extended portion 55 of the elastically stretchable base panel 20 is entirely fitted to the body of the wearer. Compared with the absence of the extending portion 55, the body can be widely covered. In addition, when the base panel 20 does not extend outward in the lateral direction X of the liquid absorbent structure 30, a part of the liquid absorbent structure 30 is exposed in the external view of the crotch area 13, and the wearer's body Although it may not be able to cover sufficiently, it may give an impression that the body fluid is likely to leak sideways, but the extension structure 55 is exposed in the external view of the crotch area 13 by the base panel 20 having the extension portion 55. It does not give the wearer an impression because it does not happen.

  Further, as described above, in the crotch region 13, the bonding region 50 between the liquid absorbent structure 30 and the base panel 20 is narrower than the absorber 34, and is located inside the side edges thereof There is. That is, the liquid absorbing structure 30 and the base panel 20 are fixed via the longitudinally long portions 51 a and 52 a of the front and rear bonding areas 51 and 52 and the intermediate bonding area 53. Although the liquid-absorbent structure 30 is likely to be displaced in the lateral direction X at the central portion located in the crotch area 13 by the movement of the wearer's body during wearing, the lateral displacement is prevented by fixing at such a joint area. Can. In addition, by fixing via the longitudinally long portions 51a and 52a narrower than the absorber 34 and the intermediate bonding area 53, the liquid absorbing structure 30 itself is secured in freedom according to the movement of the body, and the bonding is performed. The absorbent structure 30 is fitted to the body by the portion 56 (the non-fixed portion of the base panel 20 shown in FIGS. 3A and 3B) extending outward in the lateral direction X from the area and covers the body widely. be able to. Moreover, since the liquid-absorbent structure 30 has front and rear end portions located in the front and rear waist regions 11, 12, the central portion located in the crotch region 13 is interlocked with the front and rear end portions by the movement of the wearer's front and rear waist. Even in such a case, the non-fixed portion 56 extending outward in the lateral direction X from the longitudinally long portions 51a and 52a and the intermediate bonding area 53 elastically expands to laterally shift the liquid absorbing structure 30. It can absorb the power to Therefore, the liquid absorbing structure 30 is not displaced even by the movement of the waist and crotch of the wearer, and the entire buttocks can be stably covered.

  Again, referring to FIG. 1, gathers 58 are generally formed on the outer surface of the diaper 10. Specifically, a plurality of gathers 58 are formed on the outer surface of the inelastic outer layer sheet 22 by the contraction of the inner layer sheet 21 having elasticity, and the gathers 58 extend not only in the presence region of the liquid absorbing structure 30 but also It is formed on the entire outer surface of the base panel 20 extending from the outer periphery of the liquid absorbent structure 30 including the outlet portion 55. By making the elastic expansion rate of the front and rear waist areas 11 and 12 different from the elastic expansion rate of the crotch area 13, it is possible to widely cover the wearer's body in the crotch area 13 and thus the diaper 10 By forming the gathers 58 uniformly on the entire outer surface, it is possible to give the wearer the impression that the body is extensively fitted with a sheet having elastic elasticity.

  Further, in the crotch region 13, the dimension in the lateral direction X on the front waist region 11 side is smaller than the dimension in the lateral direction X of the rear waist region 12, and the latter is wider. By narrowing the front waist region 11 side of the crotch region 13 relatively narrowly, it is possible to prevent the crotch region 13 from coming into contact with the leg during walking and disturbing walking, while the rear of the crotch region 13 is By making the waist region 12 relatively wide, the entire area of the buttocks can be covered without being excessively shrunk, combined with the effect of the low elasticity region 42.

  In order to achieve such an effect of the present embodiment, the elongation of the low elasticity area 42 is 90% or less of the elongation of the high elasticity area 41, and specifically, the elongation of the high elasticity area 41 is about 2 It is preferable that the elongation rate of the low elasticity region 42 is 1.5 to 2.1 times. In addition, elastic elongation rate (expansion rate) makes the length dimension of the original horizontal direction X in materials 1, For example, elongation rate 1.5 times the length dimension is the original It means that 0.5 times the length size is added to the length size. In addition, the area ratio of the first bonding portion 44 in the high elasticity region 41 is about 1.0 to 1.2%, and the area ratio of the second bonding portion 45 in the low elasticity region 42 is about 3.0 to 4 It is preferable that it is .0%.

<Method of measuring elongation rate>
The elongation rate of the high and low elasticity areas 41 and 42 is based on the elongation of the high and low elasticity areas 41 and 42 = the length dimension of the elastic areas 41 and 42 at the maximum elongation / the length dimension of the elastic areas 41 and 42 in the contracted state It can be calculated. The measurement uses the sample which took out the diaper 10 in the state enclosed in the package, and was left to stand in the atmosphere of 20 degreeC +/- 2 degreeC, and the relative humidity of 60% +/- 5% RH in that state for 12 hours. Next, a length dimension of each elastic area (for example, about 3.0 cm) and a gather formed on the outer surface of the diaper 10 in each elastic area 41, 42 are visually observed by a measuring instrument (spring measure etc.) Measure the length dimension when stretched to an extent that can not be confirmed. The measurement was repeated 10 times, and the average value obtained was taken as the elongation rate of each elastic region 41, 42.

  As described above, even when the same elastic sheet is used for the base panel 20, the expansion ratio is set to a desired size in each of the front and rear waist areas and the crotch area by adjusting the bonding pattern. be able to. In the present embodiment, although the first bonding portion 44 is formed by the rectangular dot-shaped bonding pattern and the second bonding portion 45 is formed by the vertically long line-shaped bonding pattern, bonding of the first and second bonding portions 44 and 45 is performed. Various well-known joining patterns, such as circular shape, a laterally long line shape, and formed from a quilted pattern-like joined part, can be adopted as a pattern. Further, the entire crotch region 13 may be the low elasticity region 42, and the front and rear waist regions 11, 12 and the front and rear waist regions 11, 12 side of the crotch region 13 are the high elasticity region 41 and the crotch region 13 Only the central portion may be the low elasticity region 42. Furthermore, by forming the front and rear waist regions 11 and 12 and the crotch region 13 respectively from different elastic sheets, it is also possible to adjust the elongation rate.

<Modification 1>
FIG. 9 is a plan view of a base panel 20 in an example of a modification of the diaper 10 according to the present invention. Referring to FIG. 9, in the present modification, high elastic area 41 is located in the front and rear waist areas 11 and 12 and crotch area 13 on the side of front and rear waist areas 11 and 12, and low elastic area 42 is the crotch area 13. It is located only in the central part. As described above, the high elastic region 41 is positioned near the inner end edges 11a and 12a of the front and rear waist regions 11 and 12 located at the boundary between the front and rear waist regions 11 and 12 and the crotch region 13, Since the upper end portion is stably fitted to the thighs, the holding power of the diaper 10 is improved to prevent positional deviation as compared with the case where the high elastic region 41 is located only in the front and rear waist regions 11 and 12 it can. In addition, the low elastic region 42 is located at the central portion of the crotch region 13, so that the central portion can be contracted to prevent the heel from being exposed by being pinched between the crotch.

<Modification 2>
FIG. 10 is a plan view of a base panel 20 in an example of a variation of the diaper 10 according to the present invention. Referring to FIG. 10, in the present modification, the front and rear waist regions 11, 12 and the crotch region 13 are each formed of a fiber non-woven fabric having separate elasticity. Specifically, the front waist region 11 has a horizontally long rectangular first elastic sheet 61, the back waist region 12 has a horizontally long rectangular second elastic sheet 62, and the crotch region 13 has a first elastic sheet 61 and a second elastic sheet 61. It comprises the 3rd elastic sheet 63 in which the both-sides edge which overlaps in a part is concavely bent. The extension ratio of the first and second elastic sheets 61 and 62 is higher than the extension ratio of the third elastic sheet 63, and a high elastic region 41 is formed in the front and rear waist regions 11 and 12, and a low elastic region 42 is formed in the crotch region 13. Be done. Thus, the elongation rate of each area | region 11-13 can be adjusted by the base panel 20 being comprised from the three different elastic sheets 61-63. The elongation ratio of the portion 64 where the first and second elastic sheets 61 and 62 and the third elastic sheet 63 overlap with each other is approximately the same depending on the first and second elastic sheets 61 and 62 having high elongation rates. Since it has an elongation rate, the inner edges 11a and 12a of the front and rear waist areas 11 and 12 located at the boundary between the front and rear waist areas 11 and 12 and the crotch area 13 are stably fitted to the thigh and diaper The ten holding power is fully exerted.

  In addition to the materials described herein, various known materials commonly used in this type of field can be used without limitation for each component constituting the diaper 10. The diaper 10 is not limited to a pants-type disposable diaper, and may be a so-called open-type disposable diaper in which the side seams 16 of the front and rear waist regions 11 and 12 are not connected in advance. Furthermore, the front waist area 11, the rear waist area 12, and the crotch area 13 may be formed of separate elastic panels.

  The disclosure relating to the present invention described above can be organized at least in the following matters.

In the disposable diaper having a longitudinal direction and a lateral direction, a skin facing surface and a non-skin facing surface, a front waist region, a rear waist region, and a crotch region located between the front and back waist regions, the front and rear waist regions The crotch region is elastically stretchable at least in the lateral direction by being formed of an elastic sheet, and a high elastic region is located in the front and rear waist region, and the lateral direction in the central portion of the crotch region A low elasticity region in which the elastic elongation is lower than the high elasticity region is located, and the elongation in the low elasticity region is 1.5 to 2.1 times.

The disposable diaper according to the present invention disclosed in the paragraph 0044 includes at least the following embodiment, and the embodiment may be adopted alone or in combination.
(1) A base panel forming the front and rear waist area and the crotch area, and a liquid absorbing structure extending from the crotch area to the front and rear waist area attached to the skin facing surface side of the base panel The base panel extends laterally outward from the liquid absorbent structure.
(2) The front and rear waist area and the crotch area have an inner layer sheet located on the skin facing surface side and an outer layer sheet located on the non-skin facing surface side, and at least one of the inner and outer layer sheets Has elasticity, and a gather is formed on the outer surface of the outer layer sheet by the contraction of the elastic sheet, and the region where the liquid absorbing structure exists in the base panel and the lateral outside from the liquid absorbing structure Gathers are also formed by the contraction of the elastic sheet in the portion extending to the end.
(3) The front and rear waist area and the crotch area have an inner layer sheet located on the skin facing surface side and an outer layer sheet located on the non-skin facing surface side, and at least one of the inner and outer layer sheets Has elasticity, and the inner layer sheet and the outer layer sheet are joined to each other through a plurality of first and second joint portions, the first joint portion is located in the high elastic region, and the low elasticity The second joint is located in the area.
(4) The lateral separation dimension between the first bonding portions and the lateral separation dimension between the second bonding portions are substantially the same, and the high elastic regions are aligned in the longitudinal direction. The laterally extending non-junction zone is located between the first junctions.
(5) The first bonding portion is in the form of dots, and the second bonding portion is in the form of lines extending in the longitudinal direction.
(6) The high elasticity region and the low elasticity region are respectively formed from separate elastic sheets.
(7) The elongation in the low elastic region is 90% or less of the elongation in the high elastic region.
(8) The crotch region is wider at the rear waist region side than at the front waist region side.

DESCRIPTION OF REFERENCE NUMERALS 10 disposable diaper 11 front waist region 12 rear waist region 13 crotch region 20 base panel 21 inner layer sheet 22 outer layer sheet 30 absorbent structure 41 high elastic region 42 low elastic region 44 first bonding portion 45 second bonding portion 48 non bonding region X horizontal Y vertical

Claims (9)

A disposable diaper having a longitudinal direction and a lateral direction, a skin facing surface and a non-skin facing surface, a front waist region, a rear waist region, and a crotch region located between the front and rear waist regions,
The front and rear waist regions and the crotch region are elastically stretchable at least in the lateral direction by being formed of an elastic sheet, and a high elasticity region is located in the front and rear waist regions, and the center of the crotch region A low elasticity region, in which the elastic elongation in the lateral direction is lower than the high elasticity region ,
The said diaper characterized by the elongation rate of the said low elastic region being 1.5 to 2.1 times .   The base further includes: a base panel forming the front and rear waist area and the crotch area; and a liquid absorbing structure extending from the crotch area to the front and rear waist area attached to the skin facing surface side of the base panel The diaper according to claim 1, wherein the panel extends outward in the lateral direction from the liquid absorbent structure.   The front and rear waist area and the crotch area have an inner layer sheet located on the skin facing surface side and an outer layer sheet located on the non-skin facing surface side, and at least one of the inner and outer layer sheets is elastic. Gathers are formed on the outer surface of the outer layer sheet by the contraction of the elastic sheet, and extend outward in the lateral direction from the region where the liquid absorbing structure is present in the base panel and the liquid absorbing structure The diaper according to claim 2, wherein gathers are formed by contraction of the elastic sheet also in the portion where the elastic sheet is formed.   The front and rear waist area and the crotch area have an inner layer sheet located on the skin facing surface side and an outer layer sheet located on the non-skin facing surface side, and at least one of the inner and outer layer sheets is elastic. And the inner layer sheet and the outer layer sheet are joined to each other through a plurality of first and second joint portions, the first joint portion is positioned in the high elastic region, and the low elastic region is in the low elastic region. The diaper according to claim 2, wherein the second joint is located. Wherein the said lateral spacing dimension between the between the lateral separation dimension the second joint portion between the first joined section and about the same, the said high elastic region, the first arranged in the longitudinal direction The diaper according to claim 4, wherein the laterally extending non-joining zone is located between the joints.   The diaper according to claim 4 or 5, wherein the first joint portion is in the form of dots, and the second joint portion is in the form of lines extending in the longitudinal direction.   The diaper according to any one of claims 1 to 3, wherein the high elastic region and the low elastic region are respectively formed from separate elastic sheets.   The diaper according to any one of claims 1 to 7, wherein the elongation in the low elastic region is 90% or less of the elongation in the high elastic region.   The diaper according to any one of claims 1 to 8, wherein the crotch region is wider at the rear waist region side than at the front waist region side.

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