JP2006149745A - Pants-type disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pants-type disposable diaper capable of preventing hardening of a sheet by an adhesive on a side part of a shirred waist part to give softness. <P>SOLUTION: The pants-type disposable diaper comprises a group of a plurality of waist part elastic members 25, 25, ... disposed in the horizontal direction in a front body F and a rear body B, and a group of curved elastic members 26, ..., 28, ... disposed to cross the waist part elastic members 25, 25, ... in the front body F and the rear body B. The group of waist part elastic members 25, 25, ... are adhered to the exterior sheet 20 with the adhesive applied to the peripheral surface, and the group of curved elastic members 26, ..., 28, ... are adhered in the area where the group of curved elastic members cross the group of waist elastic members 25, 25, ... with the adhesive applied to the peripheral surface of the waist elastic members 26, ..., 28, ... without applying the adhesive on the peripheral surface of the curved elastic members 26, ..., 28, ... in the area where the group of waist elastic members 25, 25, ... are disposed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  According to the present invention, the waistline shirring is formed by a plurality of waistline elastic elastic members arranged in the horizontal direction at intervals in the vertical direction on the front body and the back body, and the front body and / or the back body. In a pants-type disposable diaper provided with a curved elastic elastic member group arranged so as to intersect the waist elastic elastic member group, a method for fixing the elastic elastic member group to the sheet particularly in the waist shirring portion is devised. It is related with the underpants type disposable paper diaper etc. which prevented hardening of the sheet | seat by an adhesive agent and gave softness to the waist shirring part.

  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, in order to fit the wearer's body shape and prevent urine leakage and stool leakage from the waist opening surface, as shown in FIG. In a pants-type disposable paper diaper comprising a diaper main body having a permeable back sheet and an absorbent body interposed therebetween, wherein the front body and the back body are each integrated at the side in the product state, One or a plurality of abdominal elastic elastic members 51, 51,... Are provided along the lateral direction in the abdominal portion, the both ends are located in the abdominal portion, the central portion swells on the crotch side, and the central portion is It is in a relationship intersecting with the position where the absorber is disposed, and further deviates to the front body edge side by 30 mm or more from the center line in the front-rear direction of the product; One or a plurality of buttocks elastic elastic members 53, 53,... Are provided along the lateral direction at the buttocks of the back body corresponding to the abdomen equivalent parts, and both ends of the back body are located at the buttocks. A pants-type disposable paper diaper provided with one or a plurality of rear body lifting elastic elastic members 54, 54..., Whose central portion bulges to the crotch side and whose central portion intersects with the arrangement position of the absorber. Is disclosed.

  Also, in Patent Document 2 below, as shown in FIG. 13, it comprises an absorbent main body and an exterior member, and the waist elastic elastic members 57, 57... Are arranged, and first elastic elastic members 55, 55... And second elastic elastic members 56, 56... Made of a plurality of elastic elastic materials are arranged. , Each from one side edge of the front and back body through the crotch to the other side edge, at least a part of which is arranged along the pair of leg openings, and further at a certain interval in the crotch Disposed pant-type disposable diapers are disclosed.

By the way, there are two conventional methods for fixing the elastic elastic member to the sheet. The first method is a method in which a hot melt adhesive is applied to the peripheral surface of the elastic elastic member and then introduced onto the sheet to fix the elastic elastic member. The second method is an elastic elastic member on the sheet side. This is a method in which a hot melt adhesive is curtain-applied to a member disposition region, and an elastic elastic member is introduced and fixed thereon. Examples of the former fixing method (hereinafter referred to as control seam method) include the following Patent Documents 3 and 4. As the latter fixing method (hereinafter, curtain coating method), for example, the following Patent Document 5 can be cited.
Japanese Patent Laid-Open No. 10-127687 JP-A-11-36103 JP 2003-265520 A Japanese Patent Laid-Open No. 5-140511 JP-A-6-197925

  In the pants-type disposable paper diaper described in Patent Document 1, in the front body F, the abdomen elastic elastic members 51, 51... Arranged along the horizontal direction and the front body lifting elastic elastic member 52 arranged in a curved shape. , 52... Are closely crossed with each other at the side, and in the back body B, the hip elastic stretch members 53, 53... Arranged along the horizontal direction and the back body lifted in a curved shape are lifted The elastic elastic members 54, 54,... The paper diaper described in Patent Document 2 is substantially the same.

  In fixing the elastic stretchable member to the sheet, the absorbent body has a high rigidity with respect to the area where the absorbent body is disposed (diaper intermediate area), and the absorbent body is in contact with the skin. However, there is no absorber on the side of the diaper, and it becomes a part where the skin is directly tightened by waist shirring, and it is a region where elastic elastic members are particularly dense, so temporarily When a curtain coating method for applying an adhesive such as hot melt on the sheet side is adopted, a large number of elastic elastic members can be arranged in an arbitrary shape in the coating region after one coating step, Although it has the advantage that the production can be made more efficient, the hot melt adhesive applied to the sheet surface hardens the sheet and gives it a feeling of stickiness. Is a problem that because fit and touch feel is poor.

  On the other hand, when the control seam method in which an adhesive such as hot melt is applied to the peripheral surface of the elastic elastic member is adopted at the side portion, the sheet can be prevented from being hardened as compared with the curtain coating method. The feeling of wearing of the rotating shearing part is improved and the touch feeling is also soft, but as the number of elastic elastic members increases, the transfer area of the hot melt adhesive to the sheet also increases, so the sheet hardens. There was a problem that the feeling of wearing was partially deteriorated.

  Therefore, the main problem of the present invention is that the waistline shirring is formed by a plurality of waistline elastic elastic member groups arranged in the horizontal direction at intervals in the vertical direction on the front body and the back body, In a pants-type disposable diaper provided with a curved elastic elastic member group arranged so as to intersect the waist elastic elastic member group on the back body, particularly to the sheet of the elastic elastic member at the side of the waist shirring It is an object of the present invention to provide a pants-type disposable diaper that prevents the sheet from being cured by an adhesive and imparts softness by devising the fixing method.

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. A waist opening and a pair of left and right leg openings are formed by joining the front body and the back body of the seat on both sides, and along the horizontal direction with an interval in the vertical direction between the front body and the back body. A curved elastic stretchable member group is formed so that a waistline shearing is formed by a plurality of waistline elastic stretchable member groups arranged and intersects with the waistline elastic stretchable member group at the front body and / or the back body. In pants-type disposable diapers with
The waist elastic elastic member group is fixed to the exterior sheet by an adhesive applied to the peripheral surface of the elastic elastic member, and the curved elastic elastic member group is at least in a region where the waist elastic elastic member group is disposed. The adhesive is applied to the peripheral surface of the waist elastic elastic member at the intersection with the waist elastic elastic member without being applied to the peripheral surface of the curved elastic elastic member. A pants-type disposable diaper characterized by the above is provided.

  In the present invention according to claim 1, the elastic elastic member group is fixed to the waist elastic elastic member by a control seam method that is fixed to the exterior sheet by an adhesive applied to the peripheral surface of the elastic elastic member. On the other hand, with respect to the curved elastic elastic member group, at least in the region where the waist elastic elastic member group is disposed, the waist elastic elastic member and the waist elastic elastic member are not applied to the circumferential surface of the curved elastic elastic member. It is made to adhere using the adhesive apply | coated to the surrounding surface of this waist elastic elastic member at the cross | intersection part of this. Therefore, since the amount and range of the adhesive used are minimized at the side portions of the waistline shirring where the elastic elastic members are concentrated, it is possible to prevent the sheet from being cured by the adhesive and to impart softness.

  As the present invention according to claim 2, the separation distance between the waist elastic elastic member and the curved elastic elastic member is 1 mm or less at both side portions where the front body and the back body of the exterior sheet are joined. An underpants-type disposable diaper according to Item 1, is provided.

  In the present invention described in claim 2, the patterns are determined so that the distance between the waist elastic elastic member and the curved elastic elastic member is 1 mm or less on both sides of the diaper. That is, by making the intersection of the waist elastic elastic member and the curved elastic elastic member close to the side edge, when cutting at a position corresponding to both side edges in the paper diaper manufacturing process, the curved elastic elastic member It is possible to eliminate the pull-in and make the start and end of these curved elastic elastic members near the side edges.

  As the present invention according to claim 3, an adhesive is applied in a range of 5 to 20 mm from the side edge of the exterior sheet to the inner side at both sides where the front body and the back body of the exterior sheet are joined. The pants-type disposable diaper according to claim 1, wherein the curved elastic elastic member group is fixed to an exterior sheet with the adhesive.

  In the present invention described in claim 3, the curved elastic elastic member is basically fixed to the sheet using a control seam of the waist elastic elastic member. In order to eliminate the pulling in of the curved elastic elastic member when cut at a position, the curtain coating method is partially used in combination with an extremely narrow range.

  As a fourth aspect of the present invention, in the middle region of the diaper other than the waistline shearing portion in which the waist elastic stretchable member group is disposed, the curved elastic stretchable member group is fixed by an adhesive applied to an exterior sheet. The underpants type disposable diaper in any one of Claims 1-3 currently provided is provided.

  In the present invention according to claim 4, the waist elastic stretchable member is fixed to the sheet, and the waist shearing portion is fixed to the sheet using the control seam of the waist elastic stretchable member. In the middle region of the diaper other than the waist shirring portion, the curved elastic elastic member group employs a so-called curtain coating method in which the curved elastic elastic member group is fixed by an adhesive applied to the exterior sheet.

  As the present invention according to claim 5, the curved elastic elastic member group extends from the one side joining edge joining the front body and the back body to the crotch side, bypasses the crotch side, and forms the other side joining edge on the opposite side. A plurality of elastic elastic member groups that are arranged at intervals without crossing each other, and the start and end of the curved elastic elastic member groups are substantially above the joint edges of the front body and the back body A pants-type disposable diaper according to any one of claims 1 to 4, wherein the pants-type disposable diaper is connected at a predetermined interval over a range from the lower part to the lower part.

  As the present invention according to claim 6, there is provided the pants-type disposable diaper according to any one of claims 1 to 5, wherein at least five or more of the curved elastic elastic member groups are arranged in the front body and / or the back body. The

  According to the present invention described above, the amount and range of the adhesive is minimized at the side of the waist shirring where the elastic elastic members are densely packed, so that the sheet can be prevented from being cured by the adhesive and softened. Will be able to.

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, and FIG. 2 is an assembled view in an unfolded state.

  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 structure of the absorptive main body 10, the exterior sheet 20, the manufacturing method thereof, and the assembly procedure of the diaper 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 FIG. 3 and FIG.

  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 liquid-permeable surface sheet 11 is wound around the side edge of the absorbent body 13 and extends to the back surface side of the absorbent body 13.

  The leak-proof sheet 12 that covers 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. 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. 4, the gathered nonwoven fabric 15 that forms the three-dimensional gathered BS is a nonwoven fabric made into a double sheet by folding, and the side edges of the absorbent body 13 that is wound up by the liquid-permeable surface sheet 11. The part is further wound up from the upper side and extends to the back surface side of the absorbent body 13 to be bonded. More specifically, the gathered nonwoven fabric 15 has a three-dimensional gather BS forming portion at the middle portion in the longitudinal direction of the paper diaper, and a range from the middle portion in the width direction to the back side of the absorbent body 13 is bonded by a hot melt adhesive or the like. Further, at the front and rear end portions in the longitudinal direction, the section from the intermediate portion in the width direction to the one side end edge is bonded in a range extending to the back surface side of the absorber 13, and the portion forming the three-dimensional gather BS is the absorber. While being folded at the upper surface portion of 13, it is bonded by a hot melt adhesive or the like.

  In the gathered nonwoven fabric 15 formed of the double sheet nonwoven fabric, a plurality of thread-like elastic elastic members 16, 16,... As shown in FIG. 4 (B), the thread-like elastic stretchable members 16, 16... Are used to form a three-dimensional gather BS by raising a non-woven fabric portion protruding from the absorber side edge portion by elastic stretch force. Is.

  The leak-proof sheet 12 enters into the double sheet-like gathered nonwoven fabric 15 and constitutes a leak-proof wall on the lower end side of the three-dimensional gather BS as shown in FIG. As the leak-proof sheet 12, it is desirable to use an opaque sheet so as not to cause browning such as defecation and urine. 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 thread-like elastic stretchable member 16, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, and the like that 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 thread-like elastic elastic member, 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 limited to synthetic fibers such as polyethylene or polypropylene, such as olefins, polyesters, and polyamides, but also regenerated 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.

(Structure of exterior sheet 20)
The inventors of the present application can develop the outer sheet 20 of the pants-type disposable diaper 1 and can fit the paper diaper without making the body feel uncomfortable, and can effectively prevent the diaper from falling off. The elastic elastic member arrangement was examined. As a result, the following knowledge was obtained.

(1) In order to fit the whole disposable diaper to the body having a complicated three-dimensional shape, as shown in Patent Document 1, each of the three parts of the waist opening, the leg opening, and the waistline is independent. It is necessary to arrange an elastic elastic member over the entire diaper and evenly attach the paper diaper to the body instead of arranging an elastic elastic member.

(2) The front part of the body does not bulge like a buttocks compared to the back side of the body, so that the diaper slippage tends to occur mainly on the front body side.

(3) When the disposable diaper is in close contact with the body, the back side of the body has a strong three-dimensional shape due to the swelling of the buttocks compared to the front side part of the body, and has a complicated curved shape, which makes the body uncomfortable In order to fit a paper diaper without giving a rust, it must be an arrangement pattern of elastic elastic members in consideration of the three-dimensional shape of the heel.

(4) The conventional leg-hole elastic members are arranged substantially along the leg-line, but the leg-hole elastic members are arranged with a few gaps between two or three elastic members. In order to substantially block the gap between the leg opening edge and the body, they are arranged as a bundle (hereinafter referred to as a bundle-like elastic expansion / contraction member), as if they were arranged so as to form one line by these elastic expansion / contraction members. It has only the function of, and does not have the function to adhere the absorber to the body.

  In this invention, it came to obtain the exterior sheet 20 which arrange | positioned various elastic elastic members by the following patterns based on the said knowledge.

  First, as shown in FIGS. 2 and 5, the exterior sheet 20 is a two-layer nonwoven fabric sheet composed of an upper layer nonwoven fabric 20A and a lower layer nonwoven fabric 20B, and various elastic properties are provided between the upper layer nonwoven fabric 20A and the lower layer nonwoven fabric 20B. An elastic member is provided and is provided with elasticity. 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 elastic member, as shown in the developed shape shown in FIG. 5, waist elastic elastic members 24, 24. Each of the front body F and the back body B has a plurality of waist elastic elastic members 25, 25,... Arranged in the horizontal direction at intervals in the vertical direction on the front body F and the back body B. In addition, apart from the waist elastic elastic member groups 25, 25..., The front body F and the back body B extend from the one side joint edge joining the front body F and the back body B to the crotch side, bypass the crotch side, Are provided with a plurality of curved elastic elastic member groups 26, 28,... Arranged at intervals without crossing each other. In the exterior sheet 20, a so-called leg-hole elastic elastic member (bundle elastic elastic member) that is substantially continuous along the leg-line cut line 29 is not provided.

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

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

  The waist elastic elastic member groups 25, 25... Are 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. The elastic elastic member is a rubber-like elastic member, in which waist waist shirring is applied to the waist part of the front body F and the back body B to apply a horizontal stretching force, so that the paper diaper is in close contact with the body. The boundary between the waist elastic elastic members 24, 24 ... and the waist elastic elastic members 25, 25 ... is not necessarily clear. For example, even if the number of elastic elastic members arranged in the horizontal direction with an interval in the vertical direction on the front body F and the back body B cannot be specified, some on the upper side are elastic waist elastic members. It suffices that the remaining elastic elastic members function as waist elastic elastic members.

  In the present paper diaper, with respect to the curved elastic elastic members 26, 28,..., An arrangement pattern of the curved elastic elastic members 28, 28 ... group arranged on the front body side F, and a curved elastic elastic material arranged on the back body side B. The arrangement pattern of the members 26, 26... Is made different. Specifically, the curved elastic elastic members 28, 28... Arranged on the front body side F are absorbed by the curved elastic elastic members 28, 28... Group at the intersection with the side edge of the absorbent main body 10. The curved elastic stretchable members 26, 26,... Arranged on the back body side B are arranged on the side edge of the absorbent main body 10. The acute side crossing angle .theta. Are arranged in a curved line in which the acute angle crossing angle α between the curved elastic elastic members 26, 26... And the absorbent main body side edge is 35 ° or more.

  Since the front part of the body does not have a bulge that becomes a hook like the buttock compared to the back side of the body, slipping of disposable diapers tends to occur prominently mainly on the front body side. It is assumed that the elastic 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 B, in order to make the exterior sheet 20 fit to the bulge shape of the buttocks, the stretchability in the direction along the bulge of the buttocks is as much as possible in order to fit the body more importantly than the sliding of the disposable diaper. In order to apply a force, the elastic elastic members 26, 26,... Are 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 sheet is wrapped so as to wrap the collar portion. 20 can come 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.

The following is a detailed description.
In the front body F of the exterior sheet 20, the abdomen curved elastic elastic member groups 28, 28... Arranged separately from the waist elastic elastic member groups 25, 25. A plurality of parts arranged to extend to the crotch part substantially along the leg circumference cut line 29 and to reach the other side side joint edge 21 while bypassing the crotch part and substantially along the leg leg cut line 29 on the opposite side. In the illustrated example, there are nine thread-like elastic elastic members, and these ventral curved elastic elastic member groups 28, 28... Are arranged at intervals without crossing each other. The ventral curved elastic elastic member groups 28, 28... Are different from the conventional leg-hole elastic elastic members in the arrangement mode. 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 abdomen elastic elastic members 28, 28... Are connected at a predetermined interval over the range 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, At the intersection with the side edge of the absorbent main body 10, the acute angle crossing angle θ between the ventral curved elastic elastic member group 28, 28 ... and the side edge of the absorbent main body 10 is 30 ° or less, preferably 28 ° or less. Are arranged in an arrangement 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.

  Further, the abdomen curved elastic elastic member groups 28, 28... Minimize the force acting in the width direction of the absorbent body 13 and prevent the absorbent body 13 from constricting at the crotch part. It is desirable that the direction of the portion is changed to an arcuate curve.

  In the present paper diaper 1, the front part F of the body does not have a bulge that becomes a hook like the back buttock of the body, so that the slippage of the paper diaper tends to occur mainly on the front body side F. In view of the knowledge, the elastic stretchable member groups 28, 28,... Are arranged at a relatively tight inclination angle, and the stretchable members 28, 28 ... are placed at an intersection angle θ = 26 ° as in the illustrated example. If this is done, 90% of the applied stretching force can be applied as an upward component force, and slipping of the paper diaper can be effectively prevented.

  On the other hand, in the back body B, the dorsal curved elastic elastic member groups 26, 26... Arranged separately from the waist elastic elastic member groups 25, 25. A plurality of lines that extend to the crotch part along the cut line 29, and are arranged so as to bypass the crotch part and reach the other side side joint edge 22 substantially along the leg leg cut line 29 on the opposite side. In the illustrated example, there are nine elastic rubber elastic elastic members, and the dorsal curved elastic elastic member groups 26, 26... Are arranged at intervals without crossing each other. The back-side curved elastic elastic member groups 26, 26,... Are different in arrangement from the conventional leg-hole elastic 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 dorsal curved elastic elastic member groups 26, 26... Are also 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, and At the intersection with the side edge, the acute angle side intersection angle α between the dorsal curved elastic elastic member group 26, 26... And the side edge of the absorbent main body 10 is 35 ° or more, preferably 40 ° or more, more preferably 45 °. They are arranged in the arrangement pattern as described above. Incidentally, in the example of illustration, it arrange | positions so that the crossing angle (alpha) may be around 47 degrees. If the elastic members 26, 26,... Are arranged at an intersection angle α = 47 °, 73% of the applied elastic force can be applied as a horizontal component force, and the exterior sheet wraps around the buttocks. 20 can be brought into close contact with the body. The crossing angle α is preferably 60 ° or less at most from the balance between the horizontal component force and the vertical component force.

  It is desirable that the back-side curved elastic elastic member groups 26, 26,... Are also changed in an arcuate curved shape at the detour portion of the crotch part. In the elastic expansion and contraction member, the expansion and contraction force acts in the tangential direction. By reversing the curve in the crotch part, the force acting in the width direction of the absorber 13 can be minimized, and the absorber 13 is contracted in the crotch part. Can be prevented.

  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 elastic member groups 26, 26... Are arranged. 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.

Incidentally, the most crotch side resilient and elastic members 28 ₁ of the front inner body side of the ventral curved resilient and elastic member groups 28, 28 ... arranged in F, dorsal curved resilient and elastic member disposed on the back body side B the group 26, 26 lowermost crotch side elastic stretchable members 26 _one of, it is desirable that the proximity without intersecting each other in the crotch portion. In the crotch part, the absorptive main body 10 is pressed and brought into close contact with the body with equal pressure by the curved elastic elastic member groups 28, 26, so that the gap with the body is sealed and a high leakage prevention effect is exhibited. become.

  As described above in detail, according to the exterior sheet 20 according to the present embodiment, all the elastic elastic members are arranged with the side joint edge as the starting end, so that the tightening force at the side joint edge is relatively high. As a result, all elastic elastic members can exert elastic force with the side joint edge as a fixed point, so that it is possible to reliably prevent the diaper from slipping down when absorbing 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.

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 elastic members are partially arranged as in the prior art is not used, and a large number of elastic elastic members are arranged uniformly on the whole, the elastic force per elastic body can be kept small. It can be stretched and peeled with less force than conventional paper 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.

(Adhesion method of elastic elastic member in exterior sheet 20)
Next, a method for fixing various elastic elastic members in the exterior sheet 20 will be described.

In Hongaiso sheet 20, as shown in FIG. 6, in the waist shirring zone _K 1, _{K 2,} the waist resilient and elastic members 24, 24 ... waist hole elastic stretchable member groups 25, 25 is, the The waist elastic elastic members 24, 24... And the elastic elastic members 25, 25... Are fixed to the exterior sheet 20 by an adhesive, and the curved elastic elastic members 26. By using the adhesive applied to the circumferential surfaces of the waist elastic elastic members 25, 25 ... at the intersections with the waist elastic elastic members 25, 25 ... without applying an adhesive to the surface. It is fixed. On the other hand, in the diaper intermediate zone M other than the waistline shearing zones K ₁ , K ₂ , the curved elastic elastic member groups 26, 28,. It is fixed with adhesive.

That is, in the waist shearing zones K ₁ , K ₂ , for the waist elastic elastic members 25, 25..., Hot melt adhesive was applied to the peripheral surface of the elastic elastic member 25 according to a known control seam method. Thereafter, the dorsal curved elastic elastic member groups 26, 26... And the ventral curved elastic elastic member groups 28, 28. The waist elastic elastic members 25, 25... Together with the waist elastic elastic members 25, 25. It is fixed by a hot melt adhesive applied to the peripheral surface of 25. As a result, as shown in FIG. 7 (the abdominal side is shown), the abdominal elastic elastic members 28, 28... Are only at the intersections (circles) with the waist elastic elastic members 25. The waist elastic elastic member 25 (and the exterior sheet 20 by the spread of the adhesive) is fixed. Therefore, since the amount and range of the adhesive are minimized at the side portions where the elastic elastic members 25, 26, 28, etc. are dense, the sheet is prevented from being cured by the adhesive and softened. Can do.

  In this case, the separation distance d between the waist elastic elastic members 25, 25... And the curved elastic elastic members 26, 28... On both sides where the front body F and the back body B of the exterior sheet are joined. Is preferably 1 mm or less. That is, at the side edge, the intersection of the waist elastic elastic members 25, 25... And the curved elastic elastic members 26, 28. When the cutting is performed at a corresponding position, the bending elastic expansion / contraction members 26, 28,... Can be removed, and the curved elastic expansion / contraction members 26, 28,.

  In order to completely eliminate the retracted amounts of the curved elastic elastic members 26, 28, ... at the time of cutting, the front body F and the back body B of the exterior sheet 20 are joined as shown in FIG. On both sides, a hot melt adhesive is supplementarily applied in a range S of 5 to 20 mm from the side edge of the exterior sheet 20 to the inside, and the curved elastic elastic member groups 26, 28,. What is necessary is just to adhere to the exterior sheet | seat 20 with an agent. In this case, as shown in FIG. 8 (B), curtain coating may be performed partially (P region) so as to straddle the diaper cutting site (shown by a chain line) of the waist shirring portion.

  On the other hand, in the diaper intermediate zone M other than the waist shirring portion, the absorber itself has high rigidity, and the absorber side comes into contact with the skin. After the hot melt adhesive is applied to the nonwoven fabric 20A (20B) on at least one side of the exterior sheet 20, the curved elastic elastic members 26, 28, ... are introduced and fixed to the adhesive application surface.

  In the manufacture of the exterior sheet 20, as shown in FIG. 8, the upper layer nonwoven fabric 20A is supplied to the upper side of the nip roller portion 30, and the lower layer nonwoven fabric 20B is supplied to the lower side, and these upper layer nonwoven fabric 20A and the lower layer nonwoven fabric are supplied. Various elastic elastic members (waist elastic elastic member 24, waist elastic elastic member 25, dorsal curved elastic elastic member 26, ventral elastic elastic member 28) are supplied between 20B and 20B, and the exterior sheet 20 is assembled. In the process, the waist elastic elastic member 24 and the waist elastic elastic member 25 are coated with a hot melt adhesive on the peripheral surfaces of the elastic elastic members 24, 25. To be supplied.

  For example, as shown in FIG. 9 (A), the peripheral surface application to the elastic elastic members 24... 25 is supplied with adhesive to the bottom of the grooves using a member 34 having a V-shaped groove. An application method using a comb gun 31 that passes an elastic expansion / contraction member through a groove, an application method using an omega member that applies an adhesive to an elastic expansion / contraction member using an omega (Ω) -shaped ring member, and FIG. As shown in the drawing, a conventionally known control seam coating method, in which an elastic elastic member is passed through the bending member 35 and an adhesive is applied, is known.

  On the other hand, the curved elastic elastic members 26... 28 are introduced into the nip roller section 30 while meandering in a curved shape by a known traverse device 32. The traverse device 32 has a holding portion of elastic elastic members 26, 28,... At the front end portion, and elastically moves the continuous web (sheets 20A, 20B) in the width direction at a calculated speed. The elastic members 26, 28,... Are arranged in a predetermined curved shape. In the present invention, hot melt adhesive is introduced to the peripheral surface of the elastic members 26, 28,. At the intersections with the elastic waist members 25, 25, etc., they are fixed by an adhesive applied to the circumferential surfaces of the waist elastic members 25, 25,.

  In addition, a hot melt adhesive is applied to at least one side of the upper layer nonwoven fabric 20A and the lower layer nonwoven fabric 20B, in the illustrated example, a region corresponding to the middle diaper zone M other than the waist shirring portion of the upper layer nonwoven fabric 20A. The curved elastic elastic members 26, 28,... Are fixed in the diaper intermediate zone M by a hot melt adhesive applied to the upper nonwoven fabric 20A.

  Examples of the hot melt adhesive include EVA, adhesive rubber (elastomer), olefin, polyester / polyamide, and the like. In the disposable diaper, the adhesive rubber (elastomer) is used. System).

(Assembly procedure for disposable 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-described embodiment, the waist elastic elastic member groups 25, 25... And the curved elastic elastic members 26, 28 arranged in the front body F and the back body B are made continuous on the absorbent main body 10. However, as shown in FIG. 11, the elastic elastic members 25, 26, 28, etc. crossing the absorbent main body 10 may be cut to be discontinuous. By making the elastic elastic members 25, 26,..., 28 discontinuous on the absorbent main body 10, the absorber 13 can be prevented from being contracted.

For example, as shown in Japanese Patent Application Laid-Open No. 2000-26015 and Japanese Patent Application Laid-Open No. 2002-273808, discontinuity of the elastic elastic member is performed by arranging various elastic elastic members on the exterior sheet 20 and then embossing cutter roll and anvil roll The outer sheet may be passed between the two and the elastic stretchable member existing within a predetermined range may be finely cut by pressing or heating with the embossing cutter roll.
(2) In the above embodiment, the highest crotch side resilient and elastic members 28 ₁ of the front inner body side of the ventral curved resilient and elastic member groups 28, 28 ... arranged in F, placed on the back body side B and most crotch-side resilient and elastic members 26 ₁ dorsal curved resilient and elastic member groups 26, 26 of the, but so as to close without intersecting each other in the crotch portion, the ventral side curved elastic stretchable member groups 28, And a part of the dorsal curved elastic elastic member groups 26, 26,... May intersect each other.

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. 2 is a plan view of the absorbent main body 10. FIG. (A) is a half cross-sectional view of the absorbent main body 10 in a developed state, and (B) is a diagram showing the product state. FIG. 3 is a development view of the exterior sheet 20. It is an application method division figure of the elastic elastic member in an exterior sheet. 3 is an explanatory view of a fixing manner of the curved elastic elastic member 28 at the side portion of the exterior sheet 20. FIG. The assembling procedure of the exterior sheet 20 is shown, (A) is a schematic view, and (B) is a plan view of the relevant part. It is a figure which shows the example of the application | coating procedure of the adhesive agent in a control seam system. It is explanatory drawing of the adhering aspect (modification) of the curved elastic elastic member 28 in the side part of the exterior sheet | seat 20. FIG. FIG. 6 is a development view illustrating a modified example of the exterior sheet 20. It is an expanded view which shows the conventional pants-type disposable paper diaper (the 1). It is a front view which shows the conventional pants-type disposable paper diaper (the 2).

Explanation of symbols

  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 edges, 24 ... waist elastic elastic member, 25 waist elastic elastic member, 26 dorsal curved elastic elastic member, 28 ventral elastic elastic member, 29 leg cut line , F ... front body, B ... back body

Claims (6)

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, and the front body and the rear body of the exterior sheet are joined on both sides in the product state. A waist opening and a pair of left and right leg openings are formed, and waist waist shirring is performed by a plurality of waist elastic elastic members arranged in the horizontal direction at intervals in the vertical direction on the front body and the back body. In a pants-type disposable diaper comprising a curved elastic elastic member group formed so as to intersect the waist elastic elastic member group on the front body and / or the back body,
The waist elastic elastic member group is fixed to the exterior sheet by an adhesive applied to the peripheral surface of the elastic elastic member, and the curved elastic elastic member group is at least in a region where the waist elastic elastic member group is disposed. The adhesive is applied to the peripheral surface of the waist elastic elastic member at the intersection with the waist elastic elastic member without being applied to the peripheral surface of the curved elastic elastic member. A pants-type disposable diaper characterized by that.   The pants-type disposable diaper according to claim 1, wherein a distance between the waist elastic elastic member and the curved elastic elastic member is 1 mm or less at both side portions where the front body and the back body of the exterior sheet are joined.   In both sides where the front body and the back body of the exterior sheet are joined, an adhesive is applied in a range of 5 to 20 mm from the side edge of the exterior sheet to the inner side, and the curved elastic elastic member group is The pants-type disposable diaper according to claim 1, which is fixed to the exterior sheet with an adhesive.   4. The curved elastic elastic member group is fixed by an adhesive applied to an exterior sheet in an intermediate region of the diaper other than the waist shirring portion where the waist elastic elastic member group is disposed. Pants-type disposable diapers described in crab.   The curved elastic elastic member group extends from the one side joint edge joining the front body and the back body to the crotch side, bypasses the crotch side and reaches the other side joint edge, and without crossing each other A plurality of elastic elastic member groups are arranged at intervals, and the start and end of the curved elastic elastic member group have a predetermined interval from the upper part to the lower part of the joint edge between the front body and the rear body. The underpants type disposable diaper in any one of Claims 1-4 connected by. The pants-type disposable diaper according to any one of claims 1 to 5, wherein at least five or more curved elastic elastic members are arranged in the front body and / or the back body.

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