JP2013031535A - Disposable wearing article - Google Patents

Abstract

Disclosed is a disposable wearing article in which a leg elastic body can be disposed along a groin portion of a wearer, and a waist region can be stably adhered to the wearer's body.
A rear waist elastic body that can expand and contract in the lateral direction is disposed in at least the rear waist region of the front and rear waist regions, and a pair of legs extending in the longitudinal direction is provided in the crotch region. An elastic body 51 is provided. The rear waist elastic body includes a rear upper waist elastic body 38 extending straight along the outer end edge 18b of the rear waist region 14, and a rear lower waist elastic body 37 positioned on the inner end edge 18a side of the rear waist region. The rear lower waist elastic body 37 has a central portion 37B that protrudes outward in the vertical direction at the central portion in the lateral direction of the rear waist region, and the rear lower waist elastic body 37 and the leg elastic body 51 intersect. Not done.
[Selection] Figure 3

Description

  The present invention relates to a disposable wearing article, and more particularly, to a disposable wearing article such as a pant-type disposable diaper having a waist elastic body and a leg elastic body, a disposable toilet training pant, and a disposable incontinence pant.

  Conventionally, disposable wearing articles having a waist elastic body and a leg elastic body are known. For example, in Patent Document 1, an elastic waist panel, an absorption chassis having front and rear ends fixed to the inner surface of the elastic waist panel, a waist elastic body disposed so as to be contractible in the lateral direction in the front and rear waist region, A disposable wearing article is disclosed that includes a leg elastic body disposed in a crotch region so as to be contractible in a longitudinal direction.

Special table 2008-508082

  The disposable wearing article according to the invention disclosed in Patent Document 1 can prevent the waist region from being misaligned and the body fluid from leaking laterally while being worn by arranging the waist elastic body and the leg elastic body. .

  However, in this type of disposable diaper, that is, a diaper having a configuration in which an absorption chassis is attached to a waist elastic panel, the waist elastic body extending in the horizontal direction and the leg elastic body extending in the vertical direction intersect or are near each other. When the rear waist elastic body is contracted, the leg elastic body is pulled inward under the influence of the contracting action, and enters into a state where the wearer's crevice is bitten. In that case, the leg elastic body cannot be positioned along the wearer's groin, and a part of the heel may be exposed to the outside, causing side leakage of excrement, and after the crotch region. Since the region on the waist region side is curved outward, it is not preferable in appearance. On the other hand, in order to prevent such disadvantages, when the extension force of the rear waist elastic body is set to be low, the rear waist region is not held at a predetermined position, and there is a possibility that displacement occurs during wearing.

  An object of the present invention is an improvement of a conventional disposable wearing article, in which a leg elastic body can be arranged along the wearer's groin, and the rear waist region is stably adhered to the wearer's body It is in the provision of the disposable wearing article which can be made.

  In order to solve the above-mentioned problems, the present invention has a longitudinal direction and a lateral direction orthogonal thereto, and is between a skin facing surface and a non-skin facing surface, a front waist region, a back waist region, and the front and back waist regions. An object of the present invention is to improve a disposable wearing article including a crotch region positioned, an annular elastic waist panel forming the front and rear waist region, and an absorbent chassis attached to the elastic waist panel.

  In the wearing article according to the present invention, a rear waist elastic body that can be expanded and contracted in the lateral direction X is disposed in the rear waist region, and leg elasticity that extends in the longitudinal direction is formed on both side edges of the crotch region. A rear waist elastic body extending linearly along the outer edge of the rear waist region, and a rear lower portion located on the inner edge side of the rear waist region. A waist elastic body, and the rear lower waist elastic body has a central portion that protrudes outward in the longitudinal direction at a central portion in the lateral direction of the rear waist region, and the rear lower waist elastic body, The leg elastic body does not intersect with the leg elastic body.

  According to the disposable wearing article of the present invention, the central portion of the rear lower waist elastic body arranged in the rear waist region has a shape that is curved outward in the vertical direction, thereby substantially intersecting the leg elastic body. Therefore, there is no possibility that the leg elastic body is directly affected by the contraction action of the rear lower waist elastic body. Therefore, when the rear lower waist elastic body contracts, the leg elastic body is drawn inward in the lateral direction, and a part of the crotch area bites into the wearer's cleft, causing fluid leakage or deteriorating the appearance. There is no fear.

The perspective view of the disposable diaper shown as an example of the disposable wearing article which concerns on this invention. A partially broken development view of a diaper. The expansion | deployment top view of the diaper which abbreviate | omitted a part of component of the absorption chassis. The exploded perspective view of a diaper. The side view of a diaper in a wearing condition. The rear view of a diaper in a wearing condition. The figure which shows a part of manufacturing process of a diaper. The expansion | deployment top view which shows an example of the other Example of a diaper. The expansion | deployment top view which shows an example of the other Example of a diaper.

  1-4, the diaper 10 has the vertical direction Y and the horizontal direction X orthogonal to it, the skin opposing surface and the non-skin opposing surface which opposes it, and the cyclic | annular elastic waist panel 11 extended in the circumference direction of a waist. And the absorption chassis 12 attached to the skin facing surface side of the elastic waist panel 11, the front waist region 13, the rear waist region 14, and the crotch region 15 located between the front and rear waist regions 13 and 14. The diaper 10 has a vertical axis P and a horizontal axis Q and is symmetric about the vertical axis P.

  The elastic waist panel 11 has an elastic belt function and includes a front waist panel 17 that forms part of the front waist region 13 and a rear waist panel 18 that forms part of the rear waist region 14. The front waist panel 17 has a horizontal rectangular shape defined by an inner end edge 17a, an outer end edge 17b, and both side edges (both side edges of the front waist region 13) 17c connecting the inner end edge 17a and the outer end edge 17b. Have The rear waist panel 18 has an inner edge 18a, an outer edge 18b, an outer edge (both side edges of the rear waist region 14) 18c extending downward from the outer edge 18b, and an obliquely extending inward from the outer edge 18c. It has a substantially trapezoidal shape defined by the inner edge 18d.

  Both side edges 17c of the front waist panel 17 and the outer edges 18c of the rear waist panel 18 facing each other are overlapped with each other, and known means such as heat embossing, sonic, etc. 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. Further, the heel flap 19 formed between the inner edges 18d of the rear waist panel 18 is a flexible portion that covers the wearer's buttock during wearing, and prevents the buttock from being exposed to the outside. At the same time, when an elastic member extending in the lateral direction X is arranged, it has a frill-like shape and can improve the appearance of the diaper.

  The front and rear waist panels 17 and 18 each include an inner layer sheet 23 positioned on the skin facing surface side and an outer layer sheet 24 positioned on the non-skin facing surface side.

The inner and outer layer sheets 23 and 24 are SMS (spunbond / meltblown / spunbond) fiber nonwoven fabric, spunbond fiber nonwoven fabric or air-through fiber nonwoven fabric having a mass of about 15 to 30 g / m ² , a plastic sheet, a laminate sheet thereof, or the like. 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.

  Between the inner and outer layer sheets 23, 24 of the front waist panel 17, a plurality of string-like or strand-like front waist elastic bodies 28 are disposed so as to be shrinkable in the lateral direction X. Therefore, the front waist panel 17 is elasticized at least in the lateral direction X.

  On the non-skin facing surface side of the outer layer sheet 24 of the front waist panel 17, a first auxiliary sheet 30 formed of a stretchable fiber nonwoven fabric extending in the lateral direction X between both side edges 17c, 17c is disposed. The first auxiliary sheet 30 has a smaller dimension in the longitudinal direction Y than the outer layer sheet 24, and the inner and outer end edges 30 a and 30 b are located inward of the inner and outer end edges 17 a and 17 b of the front waist panel 17.

  The front waist elastic body 28 includes a plurality of front lower waist elastic bodies 31 extending straight in the lateral direction X along the inner end edge 17 a of the front waist panel 17, and the outer end edge 17 b of the front waist panel 17. A plurality of front upper waist elastic bodies 32 extending straight in the lateral direction X, and a plurality of front intermediate waists extending straight in the horizontal direction X between the front upper waist elastic body 32 and the front lower waist elastic body 31 And an elastic body 33. The front waist elastic body 28 is interposed between the inner layer sheet 23 and the outer layer sheet 24 and is fixed via a hot melt adhesive applied to the inner surfaces of the sheets 23 and 24. An elastic material having a thickness of about 400 to 600 dtex and an expansion ratio of about 2.0 to 3.0 times can be used for the front waist elastic body 28.

  Between the inner and outer layer sheets 23 and 24 of the rear waist panel 18, a plurality of string-like or strand-like rear waist elastic bodies 35 are disposed so as to be contractible in the lateral direction X. Therefore, the rear waist panel 18 is elasticized at least in the lateral direction X.

  On the non-skin facing surface side of the outer layer sheet 24 of the rear waist panel 18, a second auxiliary sheet 36 formed from a stretchable nonwoven fabric extending in the lateral direction X between the side edges 18c, 18c is disposed. The second auxiliary sheet 36 has a smaller dimension in the longitudinal direction Y than the outer layer sheet 24, and the inner and outer end edges 36 a and 36 b are located inward of the inner and outer end edges 18 a and 18 b of the rear waist panel 18.

  FIG. 3 is a development plane similar to FIG. 2 in which some of the components of the absorption chassis 12 are omitted. In FIG. 3, the outer shape of the absorption chassis 12, the absorbent core 45, and the leg elastic body 51 are indicated by phantom lines.

  As shown in FIG. 3, the rear waist elastic body 35 includes a plurality of rear lower waist elastic bodies 37 having a curved shape and a plurality of lines extending linearly in the lateral direction X along the outer edge 18 b of the rear waist panel 18. A rear upper waist elastic body 38 and a plurality of rear intermediate waist elastic bodies 39 extending straight in the lateral direction X between the rear upper waist elastic body 38 and the rear lower waist elastic body 37 are provided. The rear lower waist elastic body 37 has both side portions 37A, 37A extending in the lateral direction X on both sides of the absorbent chassis 12, and a central portion 37B located between the side portions 37A and curved outward in the longitudinal direction Y. . The rear middle waist elastic body 39 and the central portion 37B of the rear lower waist elastic body 37 substantially intersect each other at the central portion of the rear waist region 14, and an intersection portion (central high elastic region) 40 is formed. Yes. Further, both side portions 37A of the rear lower waist elastic body 37 have a shape in which a portion on the center portion 37B side is bent inward in the longitudinal direction Y.

  The rear waist elastic body 35 is interposed between the inner layer sheet 23 and the outer layer sheet 24 and is fixed via a hot melt adhesive applied to the inner surfaces of the sheets 23 and 24. The rear lower waist elastic body 37 is set to have a larger extension force than the other rear waist elastic bodies 38 and 39. Specifically, the rear upper waist elastic body 38 and the rear intermediate waist elastic body 39 are configured. And an elastic material having a thickness of about 400 to 600 dtex and an expansion ratio of 2.0 to 3.0, and the rear lower waist elastic body 37 has a thickness of about 650 to 850 dtex and an expansion ratio of 2.0 to 3.0. Double elastic materials can be used.

  In the present embodiment, the front and rear waist elastic bodies 28 and 35 are formed of a string-like or strand-like elastic material. However, as long as the effects of the present invention described later are obtained, the first and second auxiliary sheets 30 and 36 and Similarly, it may be formed from a stretchable fiber nonwoven fabric sheet.

  As for various dimensions of the diaper 10, the dimension in the longitudinal direction Y of the diaper 10 is about 450 to 500 mm, and the dimension in the longitudinal direction Y of the side edges 17 c of the front waist region 13 (the length of the side edges 18 c of the rear waist region 14 is L1 is about 100 to 120 mm, and the separation dimension in the longitudinal direction Y from the inner end edge 17a of the front waist region 13 to the elastic member 31a located at the outermost portion of the front lower waist elastic body 31 is the same. L2 is about 20 to 30 mm, and the separation dimension L3 in the longitudinal direction Y from the elastic member 31a of the front lower waist elastic body 31 to the outer edge 17b of the front waist region 13 is about 80 to 100 mm. Further, the separation dimension L4 in the longitudinal direction Y from the lower end of the side edge 18c of the rear waist region 14 to the innermost elastic member 39a of the rear intermediate waist elastic body 39 is about 30 to 50 mm, and the vertical direction of the rear intermediate waist elastic body 39 The dimension L5 in Y is about 20 to 30 mm, and the separation dimension L6 in the longitudinal direction Y from the outermost elastic member 39b of the rear intermediate waist elastic body 39 to the outer edge 18b of the rear waist region 14 is about 20 to 30 mm. The outermost end (the outermost end of the central portion 37A of the rear lower waist elastic body 37) 40a of the intersecting portion 40 is located on the vertical axis P in the vicinity of the elastic member 39b of the rear intermediate waist elastic body 39. Yes.

  As shown in FIG. 3, the rear lower waist elastic body 37 and the leg elastic body 51 substantially intersect with each other because the central portion 37B of the rear lower waist elastic body 37 is bent outward in the longitudinal direction Y. Not. On the other hand, since the front lower waist elastic body 31 has a shape extending straight in the lateral direction X, it substantially intersects with the leg elastic body 51. In the present embodiment, “the elastic members substantially intersect” means that the elastic members have substantially stretchable portions that overlap each other two-dimensionally and three-dimensionally. In addition, for example, the rear waist elastic body 35, the inner layer sheet 23 or the outer layer sheet 24 to which the rear waist elastic body 35 is fixed, and the covering sheet 46 to which the leg elastic body 51 is fixed are joined to each other, The extension force of those elastic bodies reaches between the sheets. Therefore, for example, even in the case where the portion that does not exhibit substantially stretchability and the rear lower waist elastic body 37 existing by the so-called cutback process of the leg elastic body 51 and the rear lower waist elastic body 37 overlap each other in three dimensions, Since the extension force of the leg elastic body 51 does not reach 24, in this embodiment, it cannot be said that they cross substantially.

  A stretchable fiber nonwoven fabric can be used for the first and second auxiliary sheets 30 and 36. As the stretchable fiber nonwoven fabric, for example, known fiber nonwoven fabrics such as spunbond fiber nonwoven fabric, melt blown fiber nonwoven fabric, heat roll fiber nonwoven fabric, SMS fiber nonwoven fabric, airlaid fiber nonwoven fabric and air-through fiber nonwoven fabric are used alone or in combination. be able to. Stretch fiber nonwoven fabrics are, for example, elastomer resins made of polystyrene, polyurethane, etc., thermoplastic resins made of polyethylene, polypropylene, polyester, acrylic, etc., cores made of polyethylene / polypropylene, polyethylene / polyethylene terephthalate, polypropylene / polyethylene terephthalate. Consists of sheath-type and side-by-side type composite fibers. In the present embodiment, the first and second auxiliary sheets 30 and 36 are fixed between the inner and outer layer sheets 23 and 24 in a state of being stretched about 1.5 to 2.0 times in the lateral direction X.

  In the present embodiment, the first and second auxiliary sheets 30 and 36 formed from the stretchable fiber nonwoven fabric are disposed on the non-skin facing surfaces of the front and rear waist panels 17 and 18, so that the front and rear waist regions 13 and 14 are arranged. Since elasticity is given to the whole, the whole diaper 10 can be fitted to a wearer's body. However, as long as the front and rear waist elastic bodies 28 and 35 have a required elongation stress and have the effect of the present invention described later, either one or both of the first and second auxiliary seats 30 and 36 are either. It may be omitted.

  As shown in FIGS. 2 and 3, the absorbent chassis 12 includes front and rear end portions 12E and 12F, an absorbent core 45 extending in the longitudinal direction Y at least in the crotch region 15, and the entire non-skin facing surface side of the absorbent core 45. And a covering sheet 46 for covering. The absorption chassis 12 is a vertically long and substantially rectangular shape defined by front and rear end edges 12a and 12b and both side edges 12c and 12d. On the skin facing surface side of the absorbent core 45, an absorbent liner 48 formed of a liquid permeable nonwoven fabric is disposed.

  The front and rear end portions 12E and 12F of the absorbent chassis 12 are respectively attached to the non-skin facing surface side of the front and rear waist panels 17 and 18, and between the front and rear waist panels 17 and 18 and the first and second auxiliary seats 30 and 36. Is intervened. As described above, the front and rear end portions 12E and 12F of the absorption chassis 12 are covered with the first and second auxiliary sheets 30 and 36, so that when the diaper 10 is worn, the fingers are hooked on the front and rear end portions 12E and 12F. Therefore, there is no possibility that the absorption chassis 12 is detached from the elastic waist panel 11. However, as long as the front and rear end portions 12E and 12F of the absorbent chassis 12 are stably fixed to the elastic waist panel 11, the front and rear end portions 12E and 12F are fixed to the skin facing surfaces of the front and rear waist panels 17 and 18, respectively. May be.

  The absorbent core 45 has a panel shape extending in a substantially rectangular shape in the longitudinal direction Y, and is entirely encapsulated with a liquid diffusible tissue or the like (not shown). The covering sheet 46 extends outward from the peripheral edge of the absorbent core 45, and the end portions are overlapped with each other and joined together via a hot melt adhesive (not shown). A flap 49 and a side flap 50 are formed. Further, a leak-proof sheet (not shown) formed from a liquid-impermeable plastic film is disposed on the lower surface of the covering sheet 46 in the region where the absorbent core 46 exists.

The absorbent core 45 can be formed from a mixture of fluff pulp, superabsorbent polymer particles (SAP), and optionally included heat-bondable staple fibers. Cover sheet 46, hydrophobic SMS nonwoven fabric of weight approximately 10 to 30 g / ^{m 2,} or spunbonded nonwoven fabric of weight approximately 15 to 30 g / ^{m 2} or a plastic sheet, and the use thereof and the like laminate sheet it can.

  A plurality of string-like or strand-like leg elastic bodies 51 extending in the vertical direction Y are fixed to the side flaps 50 of the absorption chassis 12 so as to be extendable and contractible in the vertical direction Y. A part of both sides of the covering sheet 46 forming the side flap 50 is folded inward, and a pair of sleeves extending in the longitudinal direction Y is formed. A plurality of string-like or strand-like cuff elastic bodies 52 are fixed in the sleeve so as to be stretchable in the longitudinal direction Y via a hot melt adhesive. The sleeve stands up toward the wearer's body by the extension force of the cuff elastic body 52 when the diaper 10 is worn, and forms a leak-proof wall.

  For the leg elastic body 51 and the cuff elastic body 52, an elastic material made of natural rubber or synthetic rubber having a thickness of about 300 to 900 dtex and an expansion ratio of about 2.2 to 3.5 times can be suitably used. . In the present embodiment, the leg elastic body 51 is formed from three elastic materials, and the cuff elastic body 52 is formed from two elastic materials. However, the leg elastic body 51 is formed from a single elastic material or a plurality of elastic materials larger than the number of elastic materials. It may be formed.

  In the present embodiment, the front and rear waist elastic bodies 28 and 35 are disposed on the inner surfaces of the front and rear waist panels 17 and 18, but a part of the front and rear waist elastic bodies 28 and 35 is used as the first and second auxiliary seats. You may fix to the inner surface of 30,36. For example, the front and rear waist panels 17 and 18 are formed from only one sheet member having a dimension in the longitudinal direction Y larger than that of the present embodiment, and the front and rear end portions thereof are folded back and fixed to the front and rear folded portions. The upper waist elastic bodies 32 and 38 and the front and rear lower waist elastic bodies 31 and 37 may be disposed, and the front and rear intermediate waist elastic bodies 33 and 39 may be disposed on the inner surfaces of the first and second auxiliary seats 30 and 36. .

  FIG. 5 is a side view of the diaper 10 in a worn state, and FIG. 6 is a rear view of the diaper 10 in a worn state. For convenience of explanation, the wearer's body is indicated by virtual lines, and the front and rear waist elastic bodies 28 and 35 and the leg elastic bodies 51 are indicated by broken lines.

  As shown in FIGS. 5 and 6, the leg elastic body 51 does not substantially intersect the rear lower waist elastic body 37 in the rear waist region 14. Usually, when the leg elastic body 51 and a part of the rear waist elastic body 35 substantially cross each other, the leg elastic body 51 is drawn inward of the diaper 10 by the rear waist elastic body 35 contracting, The leg opening edge may bite into the wearer's cleft. In such a case, not only does the wearer feel uncomfortable, but there is also a risk of excrement leakage, and a part of the rear waist region 14 bulges outwardly and a part of the buttocks Since it is exposed, it is not preferable in appearance. In the diaper 10 of the present embodiment, since the rear lower waist elastic body 37 is bent outward in the longitudinal direction Y at the center portion in the lateral direction X of the rear waist region 14, the leg elastic body 51 and The rear lower waist elastic body 37 is separated by a given size, and the leg elastic body 51 is not affected by the contracting action of the rear waist elastic body 35 and is drawn inward in the lateral direction X to cause such a disadvantage. There is no fear.

  Further, at the intersecting portion 40, the rear lower waist elastic body 37 and the rear intermediate elastic body 39 intersect to form a higher elastic region than the other regions, and both side portions when the rear lower waist elastic body 37 contracts. The contraction force acts so that 37A contracts toward the central portion 37B and becomes linear in the lateral direction X instead of being curved as a whole. As a result, the leg opening edge of the crotch region 15 is pushed downward to prevent the wearer from biting into the cleft.

  Specifically, as described above, the leg elastic body 51 and the central portion 37B of the rear lower waist elastic body 37 are separated from each other in the longitudinal direction Y by about 20 to 50 mm. When the separation dimension L7 is 20 mm or less, the leg elastic body 51 may be attracted inward due to the influence of the contracting action of the rear lower waist elastic body 37. On the other hand, when the separation dimension L7 is 50 mm or more, a region where the contraction force does not act between the leg elastic body 51 and the rear waist elastic body 37 is formed in a relatively wide range. The rear waist region 14 can be easily separated from the wearer's body, the fit can be reduced, and excrement can leak.

  In the front waist region 13, the front lower waist elastic body 31 extends substantially linearly in the lateral direction X, and thus substantially intersects the leg elastic body 51. Thus, in the front waist region 13, when the front waist region 13 is pulled up at the time of wearing of the diaper 10 by the leg elastic body 51 and the front waist elastic body 28 intersecting substantially, The leg elastic body 51 is also pulled up with it, and a leg opening part can be fitted to a wearer's groin part. When the wearer of the diaper 10 is an infant, the front lower waist elastic body 31 extends in a straight line in the lateral direction X, where the abdomen and buttocks swell outward as compared to an adult. Since it is in contact with the lower abdomen located below from the wearer's navel, it protrudes upward like the rear lower waist elastic body 37 and contacts the center and upper side of the abdomen It does not give a feeling of oppression compared to.

  On the other hand, in the rear waist region 14, the central portion 37 </ b> B of the rear lower waist elastic body 37 has a shape that curves outward, and the intersecting portion 40 is a portion of the waist that is located above the buttocks of the wearer. Is facing. The part moves less than the abdomen and the buttocks, and is flat, so that a part of the rear waist region 14 can be stably adhered to the body. In addition, since the portion has a constricted shape, it can be said that a gap is easily formed between the rear waist region 14 and the body, but has a higher elongation stress than other regions of the rear waist region 14. By arrange | positioning the cross | intersection site | part 40 which has in a waist | hip | lumbar part, the back waist area 14 can be stuck to a wearer's body more stably. Note that, as described above, at the intersecting portion 40, it can be said that the rear intermediate waist elastic body 39 and the rear lower waist elastic body 37 intersect each other, so that the extension stress is higher than other areas. Even if there is no significant difference in the elongation stress, it can be said that the elastic material is locally disposed and has high rigidity compared to other regions, and can thereby be brought into close contact with the wearer's body. .

  Moreover, in the back waist area 14, since the center part 37B of the back lower waist elastic body 37 has the curved shape which curved outward, it does not cross | intersect the absorptive core 45 substantially. When a part of the rear lower waist elastic body 37 substantially intersects the absorbent core 45, the contraction force acts on the absorbent core 45, and a part of the absorbent core is wrinkled or has a step. However, in the case of this embodiment, the contraction force of the rear lower waist elastic body 37 does not directly act on the absorbent core 45. There is no risk of profit.

  Further, in the rear waist region 14, the rear end edge 45 b of the absorbent core 45 is located above the lower end edges 60 of both side portions 37 </ b> A of the rear lower waist elastic body 37. Therefore, when the both sides of the diaper 10 are grasped by hand and pulled up when worn, the rear end portion of the absorbent core 45 is lifted together with the side portions 37A, so that the rear end portion of the absorbent core 45 is positioned below the buttocks of the wearer. Can be fitted to the site. In addition, since both side portions 37A are positioned on both sides of the rear end portion of the absorbent core 45 as described above, the absorbent core 45 is not likely to be largely displaced even after absorbing bodily fluids. In addition, in order to show these effects by the center part 37B of the rear lower waist elastic body 37 projecting outward, the uppermost end 40a of the intersecting part 40 has a dimension in the longitudinal direction Y of both side edges of the diaper 10. It is preferably located above the central line 65 (indicated by the phantom line in FIG. 5) that bisects.

  In the present embodiment, as an option, the first and second auxiliary sheets 30, 36 formed of stretchable fiber nonwoven fabric are disposed in the front and rear waist regions 13, 14, so that the front and rear waist elastic bodies 28, 35 are elongated. Even if the force is set relatively low, the desired fit can be imparted in the front and rear waist regions 13 and 14. Therefore, there is no possibility that rubber marks are caused on the skin by locally pressing the skin with the front and rear waist elastic bodies 28 and 35 formed of a string-like or strand-like elastic material.

  Regarding the elongation stress of the entire front and rear waist regions 13 and 14, specifically, the elongation stress at the elongation rate of 150% of the front waist region 13 is 6.1 N / 120 mm, and the elongation at the elongation rate of 150% of the rear waist region 14. The stress is 5.1 N / 120 mm.

<Measurement method of elongation stress of front and rear waist regions 13, 14>
The elongation stress in the predetermined width of the front and rear waist regions 13 and 14 can be measured by the following method using a tensile tester (Shimadzu Corporation autograph tester, product number: AG-X10plus). Specifically, first, the front and rear waist panels 17 and 18 are separated by peeling off the seam portions 20 at both side edges of the diaper 10. Next, when measuring the elongation stress of the front waist region 13, both side edges of the front waist panel 17 are loaded into the chucks of the tensile tester (the spacing between the chucks is about 120 mm, the front and rear waist regions 13, 14 in the horizontal direction X is about 200 mm), the moving speed is 100 mm / min, and the reversal distance is 150% of the length when stretched (about 300 mm). This measurement is performed on the rear waist panel 18 in the same manner, and is defined as the elongation stress when the front and rear waist regions 13 and 14 are stretched 150%.

  Note that, unlike the diaper 10 of the present embodiment, the front and rear waist regions 13 and 14 and the crotch region 15 are formed from a series of sheet members, and the leg elastic body 51 has a curved shape along the leg opening edge. Since the leg elastic body 51 is separated from the rear waist elastic body 35 due to its configuration, there is no possibility of causing a disadvantage due to the leg elastic body 51 being drawn inward by contraction of the rear waist elastic body 35. Therefore, it can be said that the subject in this embodiment and the effect by it can arise especially about the diaper 10 which has the structure which the elastic waist panel 11 and the absorption chassis 12 consist of another body.

  FIG. 7 is a view showing a part of the manufacturing process of the diaper 10, and specifically corresponds to the rear waist elastic body 35 in the continuous web 70 formed from the fiber nonwoven fabric sheet which is the material of the outer layer sheet 24. The process which arrange | positions each continuous elastic member 71,72,73 is shown. However, this manufacturing process is an example, and the rear waist elastic body 35 may be disposed on the outer layer sheet 24 by other methods.

  As shown in FIG. 7, the continuous web 70 conveyed in the machine direction MD has first and second side edges 70a and 70b. In the vicinity of the first side edge 70a, a first continuous elastic member 71 corresponding to the upper rear waist elastic body 38, which extends straight in the machine direction MD, is disposed. Further, on the second side edge 70 b side of the first continuous elastic member 71, there is a second continuous elastic member 72 corresponding to the rear intermediate waist elastic body 39 extending in the machine direction MD in parallel with the first continuous elastic member 71. Arranged. Further, a third continuous elastic member corresponding to the rear lower waist elastic body 37 is provided on the continuous web 70 by traverse means (not shown) provided with a swing guide swinging in a cross direction CD orthogonal to the machine direction MD. 73 is disposed.

  The third continuous elastic member 73 draws a sine curve-like trajectory formed by repeating the amplitude in the cross direction CD by the traverse means, and is disposed on the continuous web 70. Thus, since the 3rd continuous elastic member 73 is arrange | positioned by fixed amplitude, the peak part 75 and the trough part 76 which adjoin in the machine direction MD have the substantially same curvature degree. By cutting the continuous web 70 along the cutting line 78, the outer layer sheet 24 in a state where the rear waist elastic body 35 is fixed can be formed. In addition, a rear waist panel having a substantially trapezoidal shape is obtained by forming the panel member by overlapping the inner layer sheet 23 on the outer layer sheet 24 formed in this way and bonding them together to form a panel member, and cutting both ends on one side edge side of the panel member. 18 can be formed.

  Through this process, the rear waist elastic body 37 can be disposed on the outer layer sheet 24, and the peak portion 75 of the third continuous elastic member 73 corresponds to the center portion 37B of the rear lower waist elastic body 37. The part 76 corresponds to the both side parts 37B. Accordingly, both side portions 37A of the rear waist elastic body 35 have a shape in which a portion on the central portion 37B side is bent inward, and the both side portions 37A and the central portion 37B have substantially the same degree of curvature. ing. Moreover, according to this process, the 1st-3rd continuous elastic members 71, 72, and 73 can be arrange | positioned by the same process and apparatus, and another continuous is changed by changing the locus | trajectory of the 3rd continuous member 73. Since a high elastic region having a high elongation stress compared with other regions can be locally formed by substantially intersecting with the elastic member, such high elasticity can be obtained by arranging other elastic materials in other steps. It can be said that the manufacturing process is simple as compared with the case where the region is formed. Each of the continuous elastic members 71, 72, 73 is formed from a string-like or strand-like elastic material, and its shape, expansion ratio, number, etc. can be freely selected according to the desired extension force. Settings can be changed.

  FIG. 8 is an exploded plan view similar to FIG. 3 showing an example of another embodiment of the diaper. In addition, since the basic structure of the diaper 10 is the same as that of this embodiment, only a different point is described below.

  In the present embodiment, the central portion 37B and the side portions 37A of the rear lower waist elastic body 37 have different degrees of curvature, and the central portion 37B curves gently and largely as compared with the side portions 37A. In this form, since the cross site | part 40 is formed in a wider range, the back waist area 14 can be closely contact | adhered to a wearer's waist | hip | lumbar part. In addition to the first and second embodiments, for example, by adjusting the amplitude of the third continuous elastic member 73 in the manufacturing process shown in FIG. Although it can also be made a small and steep curve shape as compared with that of 37A, in that case, the intersection part 40 becomes smaller, and the center part of the rear waist region 14 is fitted to the wearer's waist part in a planar shape. There is a risk that the rear waist region 14 may be misaligned during wearing.

  FIG. 9 is a plan view similar to FIG. 3, showing an example of still another embodiment of the diaper 10. In addition, since the basic structure of the diaper 10 is the same as that of this embodiment, only a different point is described below.

In the present embodiment, in the front waist panel 17, the inner layer sheet 23 is formed from a stretchable fiber nonwoven fabric, and the outer layer sheet 24 is formed from a non-stretchable fiber nonwoven fabric. The outer layer sheet 24 is longer in the longitudinal direction Y than the inner layer sheet 23.
The front upper waist elastic in the folded portion 80 formed by folding back and fixing the portion of the outer layer sheet 24 that extends further outward from the outer edge of the inner layer sheet 23. The body 32 is fixed. Thus, by not providing the front lower waist elastic body 31 and the front intermediate elastic body 33 made of a string-like or strand-like elastic material, the central portion and the lower side of the front waist region 13 are placed on the wearer's body. On the other hand, since it can be made to fit softer, it is possible to prevent the wearer's abdomen from being marked with pressure and to reduce the feeling of pressure on the wearer's abdomen. The inner layer sheet 23 can be made of the same stretchable fiber nonwoven fabric as the first and second auxiliary sheets 30 and 36. In addition, by forming the inner and outer layer sheets 23 and 24 with stretchable fiber nonwoven fabric, the entire front waist region 13 can be stretched, but the inner layer sheet 23 formed from the stretchable fiber nonwoven fabric and non-stretchable. By laminating the outer layer sheet 24 formed from the fiber nonwoven fabric, the required tensile strength can be secured and the sheet can be prevented from tearing during use as compared with the case where the stretch fiber nonwoven fabrics are laminated. In addition, the fluffing of the sheet can be suppressed.

  For each constituent member constituting the disposable diaper of the present invention, in addition to the materials described in the present specification, various known materials usually used in this type of article can be used without limitation. Also, in the specification and claims of the present invention, the terms “first” and “second” are used merely to distinguish similar elements, positions, and the like.

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

  A crotch region 15 having a longitudinal direction Y and a transverse direction X orthogonal thereto, and located between the skin facing surface and the non-skin facing surface, the front waist region 13, the rear waist region 14, and the front and rear waist regions 13,14. In the disposable wearing article 10 including the annular elastic waist panel 11 forming the front and rear waist regions 13 and 14 and the absorbent chassis 12 attached to the elastic waist panel 11, the rear waist region 14 has a string shape Alternatively, a strand-shaped rear waist elastic body 35 is disposed, and leg elastic bodies 51 extending in the longitudinal direction Y are disposed on both side edges of the crotch region 15, and the rear waist elastic body 35 is disposed. Are located on the rear upper waist elastic body 38 extending linearly along the outer end edge 18b of the rear waist region 14 and the inner end edge 18a side of the rear waist region 14. A rear lower waist elastic body 37, and the rear lower waist elastic body 37 has a central portion 37B that protrudes outward in the longitudinal direction Y at a central portion in the lateral direction X of the rear waist region 14. The wearing article 10 is characterized in that the rear lower waist elastic body 37 and the leg elastic body 51 do not intersect.

The present invention disclosed in the above paragraph 0058 can include at least the following embodiments.
(1) The rear waist elastic body 35 further includes a rear intermediate waist elastic body 39 extending straight in the lateral direction X between the rear upper waist elastic body 38 and the rear lower waist elastic body 37, A mode in which the central portion 37 </ b> B of the rear lower waist elastic body 37 intersects the rear intermediate waist elastic body 39.
(2) A string-shaped or strand-shaped front waist elastic body 28 extending in the lateral direction X is disposed in the front waist region 13, and the leg elastic body 51 intersects the front waist elastic body 28. Embodiment.
(3) A mode in which at least one of the front and rear waist regions 13 and 14 is provided with auxiliary sheets 30 and 36 that can expand and contract at least in the lateral direction X.
(4) The rear lower waist elastic body 37 has both side portions 37A in which the portion on the side of the center portion 37B is bent inward in the vertical direction, and the degree of curvature of the center portion 37B and the side portions 37A. A mode in which the degree of curvature is substantially the same.
(5) The rear lower waist elastic body 37 has both side portions 37A in which a portion on the central portion 37B side is bent inward in the longitudinal direction, and the degree of bending of the central portion 37B is the bending of the both side portions 37A. A mode that is larger than the degree.
(6) The front and rear waist elastic bodies 28 and 35 are formed from a string-like or strand-like elastic material.
(7) The front waist region 13 includes an inner layer sheet 23 formed from a stretchable fiber nonwoven fabric and an outer layer sheet 24 formed from a non-stretchable fiber nonwoven fabric.

10 Disposable wearing articles (disposable diapers)
11 Elastic waist panel 12 Absorption chassis 13 Front waist area 14 Rear waist area 15 Crotch area 18a Inner edge of the rear waist area (inner edge of the rear waist panel)
18b Outer edge of rear waist area (outer edge of rear waist panel)
30 First auxiliary seat 35 Rear waist elastic body 36 Second auxiliary seat 37 Rear lower waist elastic body 37A Both side portions 37B of the rear lower waist elastic body Center portion 38 of the rear lower waist elastic body Rear upper waist elastic body 39 Rear intermediate waist elasticity Body 51 Leg elastic body

Claims (8)

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 back waist regions, and the front and back waist regions A disposable wearing article comprising an annular elastic waist panel and an absorbent chassis attached to the elastic waist panel;
A rear waist elastic body capable of expanding and contracting in the lateral direction is disposed in the rear waist region,
Leg elastic bodies extending in the longitudinal direction are disposed on both side edges of the crotch region,
The rear waist elastic body includes a rear upper waist elastic body extending linearly along an outer edge of the rear waist region, and a rear lower waist elastic body positioned on the inner edge side of the rear waist region,
The rear lower waist elastic body has a central portion that protrudes outward in the longitudinal direction at a central portion in the lateral direction of the rear waist region, and the rear lower waist elastic body and the leg elastic body intersect with each other. The said wearing article characterized by not doing.   The rear waist elastic body further includes a rear intermediate waist elastic body that extends straight in the lateral direction between the rear upper waist elastic body and the rear lower waist elastic body, and the rear waist elastic body The wearing article according to claim 1, wherein a central portion intersects the rear intermediate waist elastic body.   The wearing article according to claim 1, wherein a front waist elastic body extending in the lateral direction is disposed in the front waist region, and the leg elastic body intersects the front waist elastic body.   The wearing article according to claim 1, wherein at least one of the front and rear waist regions is provided with an auxiliary sheet that can be expanded and contracted at least in the lateral direction.   The rear lower waist elastic body has both side portions in which the central portion side portion is bent inward in the longitudinal direction, and the bending degree of the central portion is substantially equal to the bending degree of the both side portions. The wearing article according to claim 1.   2. The rear lower waist elastic body has both side portions in which the portion on the center portion side is bent inward in the longitudinal direction, and the degree of bending of the center portion is larger than the degree of bending of the both side portions. Wearing article as described in.   The wearing article according to claim 1, wherein the front and rear waist elastic bodies are formed of a string-like or strand-like elastic material.   The wearing article according to claim 1, wherein the front waist region includes an inner layer sheet formed from a stretchable fiber nonwoven fabric and an outer layer sheet formed from a non-stretchable fiber nonwoven fabric.

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