JP4492960B2 - Pants-type disposable diapers - Google Patents

Description

  The present invention relates to a comfortable pant-type disposable diaper that eliminates a sense of incongruity and a feeling of stickiness due to an absorbent body in the front body and / or the back body and improves fit.

  Conventionally, in a pants-type disposable diaper, in order to attach an absorbent body that absorbs body fluid to the body, an elastic elastic member is disposed on the nonwoven fabric or the like that holds the absorbent body to improve fit to the body. I am doing so.

  For example, in the following Patent Document 1, as shown in FIG. 8 (A), a liquid-permeable top sheet 50, a liquid-impermeable back sheet 51, and an absorber 52 disposed between both the sheets 50 and 51. A pants-type disposable paper diaper in which both sides of the front body and the back body are joined to form a waist opening and a pair of leg openings, and the waist portion extends around the waist opening. Are provided with elastic elastic members 48, 48..., And leg elastic members 53, 53. The elastic members 49, 49... Are arranged so that the disposable diaper fits the body.

  As in the case of the disposable diapers described above, when elastic elastic members are provided independently at the three parts of the waist opening, leg opening, and waistline, the minimum fit required for the disposable diaper is obtained. However, user satisfaction has not always been obtained.

  In view of such a problem, in Patent Document 2 below, as shown in FIG. 9, as a gather on the abdomen side or the back side, or both, A disposable diaper having a downward curved gather 54 formed so as to bend toward the crotch portion and having the lowermost portion of the downward curved gather 54 located below the uppermost end of the leg opening is disclosed. .

  Further, in Patent Document 3 below, as shown in FIG. 10, the first stretchable elastic member 55 is composed of an absorbent main body and an exterior member, and each of the front and back bodies of the exterior member is composed of a plurality of stretchable elastic materials. , 55... And second stretchable elastic members 56, 56..., And these stretchable elastic members 55. A pants-type disposable diaper is disclosed in which at least a part of the diaper is disposed along a pair of leg openings and the crotch portion is disposed at regular intervals.

  Further, in Patent Document 4 below, as shown in FIG. 11, in order to further prevent misalignment, a main body having a top sheet, a back sheet, and an absorber is provided, and the main body includes an abdominal side and a back side. The waist opening and the leg opening are formed by joining and fixing the left and right side edges of each of the abdomen and the dorsal side, and the waist opening and the leg opening are The waist elastic member 57 and the leg elastic member 58 forming a substantially continuous gather along the entire circumference of each peripheral portion are arranged, and a plurality of waist elastic members 57 and / or back sides of the waist elastic member are arranged. Are arranged in a shape displaced toward the crotch part, and the amount of displacement of the waist elastic member 59.59. Is the largest disposable pouch at the center of the ventral side Tsu-type diaper is disclosed.

Furthermore, in Patent Document 5 shown below, as shown in FIG. 12, a gathered line of elastic body strips 60, 60, which run in the left-right direction throughout the front and back of the pants. The elastic bodies 60, 60... Of the front body and the back body are arranged substantially evenly in the front and rear in the left and right seal lines, and the elastic bodies 60, 60. A pants-type disposable diaper that protrudes in a curved shape toward the part is disclosed.
JP-A-7-265357 JP-A-7-299094 JP-A-11-36103 JP 2001-258931 A JP 2001-204762 A

  As described above, the elastic stretch member is disposed on the exterior member or the like that holds the absorber, so that the fit to the body is surely improved, but the adhesion of the exterior member to the body is improved. As the quality of the material increases, it has become a problem that there is a tendency for the discomfort caused by the absorbent body held between the body and the feeling of stickiness to become noticeable. In other words, the elastic elastic member disposed in the front body part and / or the back body part prevents the sliding of the diaper and the like when the exterior member is closely attached to the body. Since the absorber to be held has higher rigidity than other members and extends to the front and rear end portions with a predetermined thickness, the absorber front and rear end portions particularly in the front body portion and / or rear body portion. The difference in level gave the body an uncomfortable feeling and a feeling of tingling.

  Therefore, the main problem of the present invention is that the pants-type disposable diaper has good discomfort and comfort by eliminating the uncomfortable feeling and the feeling of stickiness due to the absorbent body, particularly in the front body and / or back body, and improving the fit of the absorbent body. Is to provide.

In order to solve the above-mentioned problem, the present invention according to claim 1 is composed of an absorbent main body including an absorbent body and an exterior sheet integrally provided on the outer surface side of the absorbent main body, and is folded at the lower part of the diaper crotch. In the pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed in a product state by joining the front body and the back body of the exterior sheet on both sides,
The absorbent main body is gradually thinned in a tapered shape from the intermediate part to the absorber front end part and / or the absorber rear end part,
The exterior sheet includes a waist elastic member arranged around the waist opening, and a plurality of waist elastic members arranged along the horizontal direction with a space in the vertical direction between the front body and the back body. In addition, each of the front body and the back body extends from the one side joint edge that joins the front body and the back body to the crotch side, bypasses the crotch side and reaches the other side joint edge of the front body and the back body And a plurality of curved elastic member groups arranged at intervals without crossing each other, and the start and end of the curved elastic member groups are substantially from the upper part to the lower part of the joint edge between the front body and the rear body. Are connected at predetermined intervals over a range of
The curved elastic member group disposed on the front body side has an acute angle crossing angle between the curved elastic member group and the absorbent main body side edge of 30 ° or less at the intersection with the side edge of the absorbent main body. The curved elastic member group disposed on the back body side has an acute angle crossing angle of 35 ° or more between the curved elastic member group and the absorbent main body side edge at the intersection with the side edge of the absorbent main body. pants-type disposable diaper is provided, characterized in that are.

In the present invention according to the first aspect, the absorber is gradually thinned in a tapered shape from the intermediate portion to the absorber front end and / or the absorber rear end. That is, the intermediate portion needs a predetermined thickness in terms of the function as an absorber, but the absorption capacity required as it goes to the front end portion and / or the rear end portion of the absorber can be reduced and depends on the absorber. Since a sense of incongruity or a feeling of gore is particularly likely to occur at the step portion of the front edge and / or the rear edge, the taper is gradually tapered so that the front end of the absorber and / or the rear end of the absorber has a minimum thickness. Try to reduce the thickness. Therefore, the feeling of discomfort and a feeling of stickiness given to the body is eliminated, and the fit property is improved along the curve of the body by reducing the rigidity of the absorbent body.

Further, in the front body and the back body of the exterior sheet, in addition to the waist elastic member and the waist elastic member group, like a conventional paper diaper, a bundle-like leg elastic member arranged along the leg opening In each of the front body and the back body, it extends from the one side joint edge that joins the front body and the back body to the crotch side, bypasses the crotch side, and on the other side joint edge of the front body and the back body A plurality of curved elastic member groups that are arranged at an interval without crossing each other at a predetermined interval from the upper end to the lower end of the joining edge of the front body and the back body. It is arranged in a manner connected by .

  First, in the disposable diaper of the present invention, the curved elastic member group is arranged with an elastic member different from the waist elastic member as a joining edge between the front body and the back body. As a result, the waist elastic member and the curved elastic member group are gathered at a joint edge (hereinafter also referred to as a side joint edge) between the front body and the back body with a high linear density. The curved elastic member group is firmly fixed and can be applied with an upward force, so that the curved elastic member group prevents the paper diaper from slipping down and holds the exterior sheet in close contact with the body. can do. Here, the curved elastic member group is different in function and arrangement from the conventional leg-hole elastic member in that it is not arranged so as to form a bundle of lines.

And in this invention, the curved elastic member group arrange | positioned at the said front body side is an acute angle side crossing angle of the said curved elastic member group and an absorptive main body side edge in the cross | intersection part with the side edge of the said absorptive main body. And the curved elastic member group arranged on the back body side is an acute angle side between the curved elastic member group and the absorbent main body side edge at the intersection with the side edge of the absorbent main body. The crossing angle is set to 35 ° or more .

  The arrangement pattern of the curved elastic member group arranged on the front body side is different from the arrangement pattern of the curved elastic member group arranged on the rear body side. Specifically, the curved elastic member group arranged on the front body side has an acute angle crossing angle of 30 between the curved elastic member group and the absorbent main body side edge at the intersection with the side edge of the absorbent main body. On the other hand, the curved elastic member group arranged on the back body side has an acute angle between the curved elastic member group and the absorbent main body side edge at the intersection with the side edge of the absorbent main body. The curve arrangement is such that the side crossing angle is 35 ° or more.

  Since the front part of the body does not have a bulge that becomes like a buttocks compared to the back side of the body, slipping of disposable diapers tends to be noticeable mainly on the front body side. It is assumed that the elastic member group is arranged. Accordingly, if the inclination angle θ is 30 °, cos 30 ° = 0.866, and a force of 86.6% or more of the applied elastic force can be applied as an upward force, which effectively prevents the paper diaper from slipping down. Will be able to prevent.

On the other hand, on the back body side, emphasis is placed on the fit to the body rather than slipping off of the paper diaper, and in order to fit the exterior sheet to the bulge shape of the buttock, the stretching force in the direction along the bulge of the buttock as much as possible In order to act, the elastic member group is arranged at a relatively gentle inclination angle. Therefore, if the inclination angle α is 35 °, sin 35 ° = 0.574, and a force of 57.4% or more of the applied elastic force can be applied as a lateral force, so that the exterior is wrapped around the buttock The sheet can be brought into close contact with the body. As a result, the absorbent main body 10 is not contracted to the center side, and the leakage preventing effect is enhanced by bringing the absorbent main body 10 into close contact with the body.

As the present invention according to claim 2 , in the absorber, the thickness of the absorber in the intermediate portion is 1 to 50 mm, and the thickness of the absorber in the absorber front end and / or the absorber rear end is 0.5 to 20 mm. pants-type disposable diaper according to claim 1 Symbol placing it is provided.

The invention described in claim 2 specifically defines the numerical range of the intermediate absorber thickness and the front end portion and / or the absorber rear end absorber thickness. In particular, by setting the numerical value range of the absorber thickness at the front end of the absorber and / or the rear end of the absorber to 0.5 to 20 mm, preferably 0.5 to 10 mm, a sense of incongruity or a feeling of wrinkles due to the absorber, etc. It will be possible to eliminate it greatly.

As the present invention according to claim 3 , the absorbent body has a width dimension of 2 at the front end part and / or the rear end part of the absorbent body with respect to the width dimension of the intermediate part absorbent body corresponding to the crotch part. pants type disposable diaper according to any one of claims 1-2 which is more than double, is provided.

In the invention according to claim 3 , the width of the absorber at the front end and / or the rear end of the absorber is more than twice the width of the intermediate absorber corresponding to the crotch. It is. In the present invention, since the absorber thickness at the absorber front end and / or the absorber rear end is reduced, the absorption capacity at the front end and / or the rear end decreases, but the front end and / or Or the fall of an absorption capability can be covered by setting the absorber width dimension of a rear-end part to 2 times or more compared with a crotch part. In addition, in the front body and / or back body part, the width dimension of the absorbent body is greatly enlarged as compared with the conventional absorbent body width dimension, so that the wearer is also free from anxiety about front and back leakage.

According to a fourth aspect of the present invention, the arrangement interval of the curved elastic member groups at the joint edge portion between the front body and the rear body is substantially the same as the arrangement interval of the curved elastic member groups at the crotch part, and the bending elasticity. The underpants-type disposable diaper according to any one of claims 1 to 3, wherein the elastic member located on the crotch side of the member group has a distance from the crotch lower folding line of the diaper within ± 50 mm.

In the present invention according to claim 4, the arrangement interval of the curved elastic member group at the joint edge portion between the front body and the rear body is substantially the same as the arrangement interval of the curved elastic member group at the crotch part, and the bending elasticity. Among the group of members, the elastic member located on the most crotch side is arranged so that the distance from the crotch lower part folding line of the diaper is within ± 50 mm, that is, the curved elastic member group neatly bypasses the region near the crotch. Is.

  The arrangement interval of the curved elastic member group is made equal between the side joint edge and the crotch part, and the line drawn by the curved elastic member group is arranged in a large wave curve shape that bypasses the crotch vicinity region as described above. As a result, the exterior sheet can be held tightly against the body.

As the present invention according to claim 5, the curved elastic member groups that is disposed on the front body and the back body, in bypass of the crotch portion or the crotch side, one of claims 1 to 4, which is diverted in an arc curved A pants-type disposable diaper according to crab is provided.

In the present invention according to the fifth aspect , the bending member group changes its direction into an arcuate curve at the crotch part or the crotch side detour part. That is, the force acting in the width direction of the disposable diaper can be minimized by changing the direction to the arcuate curve, and the shrinkage of the absorber in the width direction can be prevented.

The present invention according to claim 6 provides the pants-type disposable diaper according to any one of claims 1 to 5 , wherein the curved elastic member group is cut and discontinuous on the absorber.

In the present invention described in claim 6 , the curved elastic member group is cut and discontinuous on the absorber. Therefore, it is possible to reliably prevent the absorber from being contracted in the width direction.

The present invention according to claim 7 provides the pants-type disposable diaper according to any one of claims 1 to 6 , wherein the waist elastic member group is cut and discontinuous on the absorber.

In the present invention according to claim 7 , the waist elastic member group is cut and discontinuous on the absorber. Therefore, it is possible to reliably prevent the absorber from being contracted in the width direction.

According to the far recitations Ri present invention above, in particular the front body and / or back body portions, with discomfort and Gois feeling is eliminated by the absorber, to improve the fit of the absorbent body, comfort is good Become.

  In addition, since all the elastic members are arranged with the side joint edges as the starting and terminating ends, the tightening force at the side joint edges can be set relatively high. As a result, all the elastic members are connected to the side joints. Since the stretching force is exhibited with the edge as a fixed point, it is possible to surely prevent the paper diaper from slipping down when absorbing the body fluid. In addition, when the paper diaper is brought into close contact with the body line like shorts or briefs, it becomes comfortable to wear and the leakage prevention effect is enhanced. Furthermore, ease of wearing is improved.

In more concrete terms,
(1) The entire exterior sheet comes into close contact with the three-dimensional shape of the body. As a result, the absorbent main body is in close contact with the body, and it is possible to effectively prevent leakage of bodily fluids.
(2) Since a pattern in which elastic members are partially arranged as in the past is not used, and a large number of elastic members are arranged uniformly on the whole, the stretching force per elastic body can be kept small, It can be stretched and peeled with less force than conventional disposable diapers. In addition, since the exterior sheet does not shrink in a non-mounted state, it is difficult to catch the foot.
(3) Unlike conventional paper diapers, the tightening force does not concentrate around the waist and legs, so it is possible to eliminate the feeling of pressure and the marks caused by rubber.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First embodiment]
FIG. 1 is a product state appearance view of a pants-type disposable paper diaper 1 according to the present invention, FIG. 2 is an assembled view in a developed state, and FIG. 3 is a developed view of an exterior sheet.

  As shown in FIGS. 1 and 2, the present pants-type disposable paper diaper 1 (hereinafter simply referred to as a paper diaper) is provided between a liquid-permeable surface sheet 11 made of nonwoven fabric and a leak-proof sheet 12 made of polyethylene or the like. The absorbent main body 10 interspersed with an absorbent body 13 such as cotton pulp, and the exterior sheet 20 provided integrally on the outer surface side of the absorbent main body 10, and the predecessor of the exterior sheet 20 in a product state A pants-type disposable diaper having a structure in which a waist opening and a pair of left and right leg openings are formed by joining a back and a back body on both sides.

  Hereinafter, the absorbent main body 10, the exterior sheet 20, and the assembly structure thereof will be described in this order.

(Structure of the absorbent main body 10)
First, an example of the structure of the absorbent main body 10 will be described in detail based on FIGS. 5 and 6.

  As described above, the absorbent main body 10 has a structure in which an absorbent body 13 such as cotton-like pulp is interposed between a liquid-permeable surface sheet 11 made of a nonwoven fabric or the like and a leak-proof sheet 12 made of polyethylene or the like. And absorbs and retains body fluids.

  In the illustrated example, the absorbent body 13 is formed with a substantially square shape in plan view, and the width dimension thereof is a dimension width that does not give the wearer a feeling of gore by hitting the crotch portion. The absorbent body 13 is surrounded by the crepe paper 14 in order to maintain the shape and improve the diffusibility of the body fluid that has passed through the liquid-permeable surface sheet 11. As the absorber 13, it is desirable to use an airlaid absorber that can reduce the bulk.

  As the liquid-permeable surface sheet 11 covering the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid-permeable surface sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent.

  The leak-proof sheet 12 covering the back surface side (non-skin contact surface side) of the absorbent body 13 is made of a liquid-impervious plastic sheet such as polyethylene or polypropylene, but in recent years has moisture permeability from the viewpoint of preventing stuffiness. Those are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility.

  On the other hand, as shown in FIG. 6, the gathered nonwoven fabric 15 forming the three-dimensional gather BS leaves a three-dimensional gather BS forming portion in the middle portion in the longitudinal direction of the paper diaper, and the outer portion from the middle portion in the width direction is a hot melt adhesive. It adheres to the leak-proof sheet 12 by, for example. The inner sheet portion of the gathered nonwoven fabric 15 is double-folded, and a plurality of elastic elastic members 16, 16... Are disposed inside, and the elastic elastic members 16, 16. A three-dimensional gather BS is formed.

  As the leak-proof sheet 12, it is desirable to use an opaque sheet so that brown color such as defecation and urine does not appear. As the opacification, a plastic film and a pigment and filler such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc and barium sulfate are preferably used.

  As the elastic elastic member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, etc., which are usually used can be used. In order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less, the tension is 150 to 350%, and the interval is 7.0 mm or less. Instead of the elastic elastic member 16, a tape-like elastic elastic member having a certain width may be used.

  In the same manner as the liquid-permeable surface sheet 11, the material fiber constituting the gathered nonwoven fabric 15 is not only synthetic fibers such as polyethylene or polypropylene, but also synthetic fibers such as polyester and amide, as well as recycled fibers such as rayon and cupra, Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a non-woven fabric with a low basis weight and excellent air permeability. Further, with respect to the gathered nonwoven fabric 15, in order to prevent the transmission of urine and the like, to prevent fogging and to improve the feel to the skin (dry feeling), a silicon-based, paraffin-metal-based, alkylchromic chromoid-based water repellent It is desirable to use a water-repellent non-woven fabric coated with such as.

  As the absorbent body 13, for example, a material in which a superabsorbent resin is mixed in pulp or a material in which chemical fibers are mixed in a pulp and a superabsorbent resin is mixed is used. As shown in the figure, it is desirable that the absorbent body 13 is surrounded by crepe paper 14 in order to keep its shape, rapidly diffuse menstrual blood, and the like and prevent the body fluid once absorbed from returning. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as molten pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price.

In the present paper diaper 1, as shown in FIG. 5 (B), the absorber 13 has a thickness of the absorber at the absorber front end and the absorber rear end rather than the thickness t _C of the absorber 13 at the intermediate portion. t _E is formed thin. Specifically, it has an equal-thickness section A having a predetermined length in the longitudinal direction at the longitudinal intermediate portion, and the thickness is gradually reduced in a tapered shape from the front end portion to the absorber front end side (front body F side). A front side thinning section B is formed, and a rear side thinning section C is formed in which the thickness is gradually tapered from the rear end portion of the constant pressure section A to the absorber rear end side (rear body B side). ing. The thinning at the front and rear end portions of the absorber is intended to reduce the thickness of the absorber of the standard layer that does not include the middle / high portion when a middle / high portion is formed in the middle portion of the absorber.

The absorber 13 has an absorber thickness t _{C at} the intermediate portion of 1 to 50 mm, preferably 3 to 15 mm, and a thickness t _{E at} the front end portion and the rear end portion of the absorber 13 of 0.5 to 0.5 mm. It is desirable that the thickness is 20 mm, preferably 0.5 to 10 mm, more preferably 0.5 to 5 mm. In particular, when the thickness of the absorber front end portion and the absorber rear end portion exceeds 20 mm, even if the thickness is thinner than that of the intermediate portion, it is not possible to sufficiently eliminate the uncomfortable feeling and the feeling of sticking.

On the other hand, in the absorber 13, since the absorption capacity is reduced by the intermediate portion because the front end portion and the rear end portion are thinned, as shown in FIG. 6, the front end portion of the absorber 13 and to more than twice the desired width dimension B _E of the absorbent body 13 at the rear end portion of the width dimension B _C of the intermediate portion absorber corresponding to the crotch portion. That is, by increasing the width dimension _BE of the absorber 13 at the front end portion and the rear end portion of the absorbent body 13, it is possible to cover a decrease in the absorption capacity due to the thinning of the front and rear end portions of the absorbent body 13 and By setting the front F and rear body B portions to be considerably larger than the conventional absorbent body width dimension, the wearer can be relieved of anxiety about front-rear leakage and can wear a disposable diaper with peace of mind.

[Another form of the absorbent main body 10]
(1) By the way, the embodiment in both the thickness t _E of the absorbent body 13 in the absorbent body front end portion and the absorber rear end has been to form thinner than the thickness t _C of the absorber intermediate portion, the absorber Only one side of the front end portion side and the rear end portion side of 13 may be formed thin.
(2) Similarly, both the width B _E of the absorbent body 13 in the absorbent body front end portion and the absorber rear end in the above embodiment has been set to twice or more than the width B _C of the absorber intermediate portion Alternatively, only one side of the front end portion and the rear end portion of the absorber 13 may be widened.

(Structure of exterior sheet 20)
As shown in FIGS. 2 and 3, the exterior sheet 20 is a non-woven sheet having a two-layer structure including an upper layer nonwoven fabric 20A and a lower layer nonwoven fabric 20B, and various elastic members are provided between the upper layer nonwoven fabric 20A and the lower layer nonwoven fabric 20B. Arranged and stretchable. The planar shape forms a pseudo hourglass shape as a whole by the concave leg-around cut lines 29 formed to form leg openings on both sides of the middle.

  In the exterior sheet 20 according to the present invention, as the elastic member, in the developed shape shown in FIG. 3, waist elastic members 24, 24... Arranged around the waist opening 23, the front body F and the back body B includes a plurality of waist elastic member groups 25, 25,... Arranged in the horizontal direction at intervals in the vertical direction, and the waist elastic members in the front body F and the back body B, respectively. Apart from the groups 25, 25 ..., the front body F and the back body B are joined from the one side joint edge joining the crotch side, bypassing the crotch side and reaching the other side joint edge of the front body and the back body. In addition, a plurality of curved elastic member groups 26, 28,... Arranged at intervals without crossing each other are provided. In addition, in this exterior sheet 20, what is called a leg periphery elastic member substantially continuous along the said leg periphery cut line 29 is not provided.

  Hereinafter, the various elastic members will be described in detail.

  The waist elastic members 24, 24... Are arranged in the vicinity of the waist opening edge in the range of the side joint edges 21, 22 where the front body F and the back body B are joined, with an interval in the vertical direction. A plurality of thread rubber-like elastic members for attaching a disposable diaper to the body by applying an expansion / contraction force so as to tighten around the waist of the body. For the waist elastic member 24, rubber thread is used in the illustrated example. However, for example, a tape-like elastic member may be used.

  The waist elastic members 25, 25... Are thread rubbers arranged in the horizontal direction at intervals in the vertical direction over the range from the upper part to the lower part of the side joint edges 21, 22. It is an elastic member, and is used to apply a stretching force in the horizontal direction to the waist portions of the front body F and the back body B, respectively, so that the disposable diaper is in close contact with the body. The boundary between the waist elastic members 24, 24 ... and the waist elastic members 25, 25 ... is not necessarily clear. For example, among the elastic members arranged in the horizontal direction with an interval in the vertical direction on the front body F and the back body B, even if the number cannot be specified, some on the upper side function as waist elastic members. The remaining elastic members only have to function as waist elastic members.

  In the rear body B, the dorsal curved elastic member groups 26, 26,... Arranged separately from the waist elastic member groups 25, 25,. Extending to the crotch part along the crotch part, bypassing the crotch part, being substantially along the opposite leg leg cut line 29 and being arranged so as to reach the other side side joint edge 22, 9 in the illustrated example These back rubber elastic members 26, 26,... Are arranged at intervals without crossing each other. The dorsal curved elastic member groups 26, 26,... Are different in arrangement from the conventional leg-hole elastic members. That is, about two or three elastic expansion and contraction members are not arranged substantially as a bundle with a close interval, but at a predetermined interval so as to form a predetermined expansion and contraction zone, five or more, Preferably seven or more are arranged.

  The starting and terminating ends of the dorsal curved elastic member groups 26, 26... Are connected at a predetermined interval from the upper part to the lower part of the joining edge of the front body F and the rear body B, At the intersection with the edge, the acute angle intersection angle α between the dorsal curved elastic member group 26, 26... And the absorbent main body 10 side edge is 35 ° or more, preferably 40 ° or more, more preferably 45 ° or more. Are arranged in an arrangement pattern. Incidentally, in the example of illustration, it arrange | positions so that the crossing angle (alpha) may be about 47 degrees. The crossing angle α is preferably 60 ° or less at most from the balance between the horizontal component force and the vertical component force.

In the side joint edges 21 and 22 of the front body F and the back body B, the elastic member 26 _i located closest to the waist opening in the dorsal curved elastic member groups 26, 26. members 24, 24 ... distance _{S B} from the lowermost elastic member 24 _O in is arranged to be within 20 mm. When the wearer grasps the side of the waist part and pulls it upward when wearing it, the elastic force of the curved elastic members 26, 26... Makes it easier to pull the rear body B side of the paper diaper upward, so that ease of wearing is improved. become.

  In addition, it is desirable that the dorsal curved elastic member groups 26, 26,... In the elastic member, when the elastic force acts in the tangential direction, the force acting in the width direction of the absorber 13 can be minimized by reversing the curved shape in the crotch part, and the shrinkage of the absorber 13 in the crotch part can be reduced. It becomes possible to prevent.

  In the present diaper 1, in the back body B, in order to fit the exterior sheet 20 corresponding to the bulge shape of the buttock, the stretch force is applied in a direction along the bulge of the buttock as much as possible at a relatively gentle inclination angle. The elastic member groups 26, 26... Are arranged. As shown in the illustrated example, if the expansion members 26, 26,... % Can be allowed to act as a horizontal component force, and the exterior sheet 20 can be brought into close contact with the body so as to wrap the buttocks. As a result, the absorptive main body 10 is not contracted to the center side, and the leak prevention effect is enhanced by securely contacting the absorbent body 10 with the body.

Furthermore, the arrangement | positioning space | interval of the back side curved elastic member group 26,26 ... in the side part joining edge 21,22 of the said front body F and the back body B, ie, arrangement | positioning in the elastic member arrangement | positioning area BL of the side part side edge 21,22. The interval is substantially the same as the arrangement interval of the dorsal curved elastic member groups 26, 26... In the elastic member arrangement section MB at the crotch portion, and is the most crotch side among the dorsal curved elastic member groups 26, 26. The elastic member 26 _O located is arranged so as to draw a curved shape in which the distance BH from the crotch lower fold line CL of the diaper is within ± 50 mm, preferably within 35 mm. The spacing between the dorsal curved elastic member groups 26, 26... Is evenly arranged between the side joint edges 21, 22 and the crotch part, so that the entire exterior sheet 20 can be applied to the body with equal balance without concentration of elastic force. When the lines drawn by the dorsal curved elastic member groups 26, 26,... Are arranged in a large-wave curve shape that bypasses the region near the crotch, the exterior sheet 20 is tightly adhered to the body. It will be able to hold. In addition, the method of making the arrangement | positioning space | interval of the back | dorsal bending elastic member group 26, 26 ... evenly by the side part joining edges 21 and 22 and the crotch part is explained in full detail by the manufacturing method of the exterior sheet 20 mentioned later.

  The dorsal curved elastic member groups 26, 26,... Arranged on the back body B side are preferably biased toward the front body F side at the crotch part with reference to the crotch folding line CL of the diaper. In the crotch part, the back-side curved elastic member groups 26, 26... Are biased toward the front body F side with respect to the crotch part folding line CL of the diaper, thereby eliminating the diaper slipping that occurs on the buttocks side and the exterior sheet 20. It can be made to fit the body without sag.

  On the other hand, in the front body of the exterior sheet 20, the abdomen curved elastic member groups 28, 28... Arranged separately from the waist elastic member groups 25, 25. A plurality of, in the illustrated example, nine thread-like elastic members that extend to the side, bypass the crotch side, reach the other side side joining edge 21, and are arranged at intervals without intersecting, These ventral curved elastic member groups 28, 28... Are arranged at intervals without crossing each other. The ventral curved elastic member groups 28, 28... Are also different in arrangement from the conventional leg-hole elastic members. That is, about two or three elastic expansion and contraction members are not arranged substantially as a bundle with a close interval, but at a predetermined interval so as to form a predetermined expansion and contraction zone, five or more, Preferably seven or more are arranged.

  The start and end of the ventral elastic member groups 28, 28... Are also connected at a predetermined interval from the upper part to the lower part of the side joint edges 21 and 21 of the front body F and the back body B, and the absorption. At the intersection with the side edge of the absorbent main body 10, the acute angle side crossing angle θ between the ventral curved elastic member groups 28, 28... And the side edge of the absorbent main body 10 is 30 ° or less, preferably 28 ° or less. Arranged in a pattern. Incidentally, in the example of illustration, it arrange | positions so that crossing angle (theta) may be around 26 degrees. The crossing angle θ is preferably at least 20 ° or more from the balance of the horizontal component force and the vertical component force.

  In the ventral curved elastic member groups 28, 28..., In order to minimize the force acting in the width direction of the absorbent body 13 and prevent the absorbent body 13 from contracting at the crotch part, It is desirable that the direction is changed to a substantially arcuate curve.

  In the present paper diaper 1, since the front part of the body does not have a bulge that becomes a catch like the back buttock of the body, it is found that the slippage of the paper diaper tends to occur mainly on the front body side F In view of the above, the elastic member groups 28, 28,... Are arranged at a relatively tight inclination angle, and the expansion members 28, 28,. If so, 90% of the applied stretching force can be applied as an upward component force, and slipping of the paper diaper can be effectively prevented.

In the side joint edges 21 and 22 of the front body F and the back body B, the elastic member 28 _i located closest to the waist opening in the ventral curved elastic member groups 28, 28. distance S _F from the lowermost elastic member 24 _O member is arranged to be within 20 mm. When the wearer pulls up with the side of the waist when wearing, the front body F side of the disposable diaper is easily lifted upward by the elastic force of the abdomen curved elastic members 28, 28. become.

Furthermore, the arrangement | positioning space | interval of the ventral | curvature curved elastic member group 28,28 ... in the side part joining edge 21,22 of the said front body F and the back body B, ie, arrangement | positioning in the elastic member arrangement | positioning area FL of the side part side edge 21,22. The interval is substantially the same as the arrangement interval of the ventral curved elastic member groups 28, 28... In the elastic member arrangement section MF at the crotch portion, and the furthest crotch side among the ventral curved elastic member groups 28, 28. The positioned elastic member 28 _O is arranged so as to draw a curved shape in which the distance FH from the crotch fold line CL of the diaper is within ± 50 mm, preferably within 35 mm. By arranging the intervals between the ventral curved elastic member groups 28, 28... At the side joint edges 21 and 22 and the crotch part, the outer sheet 20 is closely attached to the body in an even balance without the elastic force being concentrated. The line drawn by the ventral curved elastic member groups 28, 28,... Is arranged in a large-wave curve shape that bypasses the region near the crotch, thereby holding the exterior sheet 20 tightly in contact with the body. You can get it. In addition, it explains in full detail in the manufacturing method of the below-mentioned exterior sheet | seat 20 about the arrangement | positioning space | interval of the ventral | curvature bending elastic member group 28,28 ... evenly arranged by the side part joining edges 21 and 22 and the crotch part.

By the way, the innermost crotch elastic member 28 _O among the ventral curved elastic member groups 28, 28... Arranged on the front body side F, and the dorsal curved elastic member group 26 arranged on the rear body side B. 26... Of the most crotch lower elastic member 26 _O in the crotch portion is preferably close to each other without crossing each other. The proximity width (FH-BH) is desirably 10 to 20 mm. In the crotch part, the absorbent main body 10 is pressed and adhered to the body side with equal pressure by the curved elastic member groups 28, 26, so that the gap with the body is sealed and a high leakage prevention effect is exhibited. Become.

  By the way, in the said form example, waist elastic member group 25,25 ... and curved elastic member 26 ..., 28 ... which are arrange | positioned at the front body F and the back body B are arrange | positioned continuously also on the absorptive main body 10. FIG. However, as shown in FIG. 4, the elastic member that crosses the absorbent main body 10 may be cut to be discontinuous. By making the elastic member discontinuous on the absorbent main body 10, the absorber 13 can be further prevented from shrinking. Regardless of whether or not the elastic member is cut on the absorbent main body 10, the waist elastic member groups 25, 25... And the curved elastic members 26. As long as they are arranged according to the above.

(Method for manufacturing exterior sheet 20)
Next, the manufacturing method of the exterior sheet 20 will be described in detail.

  As shown in FIG. 7, the outer sheet 20 is manufactured by supplying the upper layer nonwoven fabric 20 </ b> A to the upper side of the nip roller portion 30 and the lower layer nonwoven fabric 20 </ b> B to the lower side, and the upper layer nonwoven fabric 20 </ b> A and the lower layer nonwoven fabric 20 </ b> B. Are supplied with various elastic members (waist elastic member 24, waist elastic member 25, dorsal curved elastic member 26, ventral elastic member 28), and the exterior sheet 20 is continuously assembled.

  Here, the waist elastic members 24, 24... And the waist elastic members 25, 25... Are linearly introduced along the line direction, whereas the curved elastic members 26. It is introduced into the nip roller section 30 while meandering in a curved shape by the traverse device 32. The traverse device 32 has a holding portion of elastic elastic members 26, 28,. The expansion members 26, 28, ... are arranged in a predetermined curved shape. Therefore, the arrangement | positioning space | interval of the said bending elastic members 26 and 28 can be made into equal arrangement | positioning naturally by the side part joining edges 21 and 22 and the crotch part.

  The waist elastic member 24 and the waist elastic member 25 are fixed to the sheet by applying a hot melt adhesive to the peripheral surfaces of the elastic members 24, 25. The

  On the other hand, with respect to the intermediate zone M between the waist elastic elastic members 25, 25 ... of the front body and the waist elastic elastic members 25, 25 ... of the back body, at least one side of the upper nonwoven fabric 20A and the lower nonwoven fabric 20B. In the illustrated example, the lower-layer nonwoven fabric 20B is bead-coated by the coater 33 so as to form a plurality of rows along the horizontal direction at intervals in the vertical direction, and the curved elastic elastic members 26, 28,. In the intermediate zone M, it is fixed by a hot melt adhesive applied to the lower layer nonwoven fabric 20B.

  In order to cut the curved elastic members 26, 28, ... on the absorbent main body 10 and make them discontinuous, it is described in JP 2002-35029, JP 2002-178428, and JP 2002-273808. The cutting method to be used is preferably employed. The elastic stretchable member cutting method described in the publication basically has a plurality of convex portions arranged on the surface after manufacturing a laminated sheet 20 ′ to be the exterior sheet 20, as shown in FIG. The laminated sheet 20 ′ is passed between an embossed heat roll 34 and a counter roll 35 facing the embossed heat roll 34, and the curved elastic members 26, 28,. It cut | disconnects by at least one of the pressurization between the convex part and the opposing roll 35, and a heating. Note that the X region in FIG. 7B indicates the cutting range.

(Assembling paper diapers)
As shown in FIG. 2, the absorbent main body 10 and the exterior sheet 20 are integrally bonded to the upper surface side of the exterior sheet 20 by an adhesive such as hot melt. And the absorptive main body 10 and the exterior sheet | seat 20 are folded up in the front-back direction, and the both sides are mutually assembled by heat welding or a hot-melt-adhesive etc., and it assembles into a pants-type paper diaper.

[Other examples]
(1) In the above embodiment, the most crotch elastic member 28 _O in the abdomen curved elastic member group 28, 28... Arranged on the front body side F, and the back side arranged on the back body side B. In the curved elastic member groups 26, 26..., The most crotch lower elastic member 26 _O is brought close to the lower crotch without crossing each other. And a part of the dorsal curved elastic member groups 26, 26,...

BRIEF DESCRIPTION OF THE DRAWINGS It is a product state external view of the underpants type disposable paper diaper 1 which concerns on this invention. It is an assembly drawing in the unfolded state. FIG. 3 is a development view of the exterior sheet 20. FIG. 6 is a development view illustrating a modified example of the exterior sheet 20. The absorptive main body 10 is shown, (A) is a plan view, and (B) is a BB line arrow view. 6 is a plan view showing another example of the absorbent main body 10. FIG. The assembling procedure of the exterior sheet 20 is shown, (A) is a schematic view, and (B) is a plan view of the main part. The conventional pants type disposable paper diaper (the 1) is shown, (A) is a development view, (B) is a product state diagram. It is a front view which shows the conventional pants-type disposable paper diaper (the 2). It is an expanded view which shows the conventional pants type disposable paper diaper (the 3). It is an expanded view which shows the conventional pants type disposable paper diaper (the 4). The conventional pants type disposable paper diaper (the 5) is shown, (A) is a front view, (B) is an expanded view.

  DESCRIPTION OF SYMBOLS 1 ... Paper diaper, 10 ... Absorbent main body, 11 ... Liquid-permeable surface sheet, 12 ... Leak-proof sheet, 13 ... Absorber, 14 ... Crepe paper, 15 ... Gathered nonwoven fabric, 16 ... String-like elastic elastic member, 20 ... Exterior sheet 21 ... 22 side joint edge, 24 ... waist elastic member, 25 ... waist elastic member, 26 ... dorsal curve elastic member, 28 ... ventral curve elastic member, 29 ... leg circumference cut line, F ... predecessor Around, B ... back body

Claims (7)

It consists of an absorbent main body including an absorbent body and an exterior sheet integrally provided on the outer surface side of the absorbent main body. The front body and the rear body of the exterior sheet are joined at both sides by being folded at the lower part of the diaper. In the pants-type disposable diaper in which the waist opening and the pair of left and right leg openings are formed in the product state,
The absorbent main body is gradually thinned in a tapered shape from the intermediate part to the absorber front end part and / or the absorber rear end part,
The exterior sheet includes a waist elastic member arranged around the waist opening, and a plurality of waist elastic members arranged along the horizontal direction with a space in the vertical direction between the front body and the back body. In addition, each of the front body and the back body extends from the one side joint edge that joins the front body and the back body to the crotch side, bypasses the crotch side and reaches the other side joint edge of the front body and the back body And a plurality of curved elastic member groups arranged at intervals without crossing each other, and the start and end of the curved elastic member groups are substantially from the upper part to the lower part of the joint edge between the front body and the rear body. Are connected at predetermined intervals over a range of
The curved elastic member group disposed on the front body side has an acute angle crossing angle between the curved elastic member group and the absorbent main body side edge of 30 ° or less at the intersection with the side edge of the absorbent main body. The curved elastic member group disposed on the back body side has an acute angle crossing angle of 35 ° or more between the curved elastic member group and the absorbent main body side edge at the intersection with the side edge of the absorbent main body. pants-type disposable diaper, characterized in that it is a. The absorbent body is 1~50mm the thickness of the absorber in the intermediate portion, according to claim 1 Symbol placement of pants is the thickness 0.5~20mm of the absorbent body in the absorbent body front end portion and / or the absorber rear portion Type disposable diaper. The width of the absorber at the absorber front end and / or the absorber rear end is at least twice as large as the width of the intermediate absorber corresponding to the crotch portion. 2. The pants-type disposable diaper according to any one of the above. The arrangement interval of the curved elastic member group at the joint edge portion between the front body and the back body is substantially the same as the arrangement interval of the curved elastic member group at the crotch part, and the furthest crotch side in the curved elastic member group. The pants-type disposable diaper according to any one of claims 1 to 3, wherein the elastic member is located within a distance of ± 50 mm from the crotch lower folding line of the diaper. The pants-type disposable diaper according to any one of claims 1 to 4, wherein the curved elastic member group arranged in the front body and the back body is turned in an arcuate curve at a crotch part or a detour part on the crotch side. On the absorber, and cutting the curved elastic member groups, pants-type disposable diaper according to any one of claims 1 to 5 in a discontinuous. On the absorber, and cutting the waist elastic member groups, pants-type disposable diaper according to any one of claims 1 to 6 in a discontinuous.

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