JP2006149747A - Pants-type disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pants-type disposable diaper which has excellent fitting property to the body, is reliably prevented from slipping down, and is prevented from shrinking of an absorptive body. <P>SOLUTION: An exterior sheet 20 has waist elastic members 24 arranged around waist open sections and a plurality of loin elastic member groups 25 arranged along a body front F and a body back B horizontally. The exterior sheet further has a plurality of curved elastic member groups 26 and 28 each extending from one side joint edge to a crotch side, detouring around the crotch side and reaching the other side joint edges, and arranged so as to be spaced from each other without intersection. The heads and ends of the curved elastic member groups 26 and 28 are connected at predetermined intervals in a range from substantially the upper sections to the lower sections of the side joint edges of the body front and the body back. The curved elastic member groups 26 and 28 are cut on the absorber 13 to make them discontinuous. The curved elastic member groups 26 and 28 are cut at positions almost along the lateral edge shape line of the absorber 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pants-type disposable diaper that is excellent in fit to the body and prevention of diaper slipping, has a good appearance, is comfortable to wear, and prevents the absorbent body from shrinking.

  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. 9A, a liquid-permeable top sheet 50, a liquid-impervious back sheet 51, and an absorbent body 52 arranged between these 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 elastic members 53, 53. Elastic elastic members 49, 49... Are arranged to fit the disposable diaper to 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 achieved.

  In view of such a problem, in Patent Document 2 below, as shown in FIG. 10, 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. 11, the first elastic elastic member 55 is composed of an absorbent main body and an exterior member, and each of the front body and the back body of the exterior member is composed of a plurality of elastic 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. 12, 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 a ventral side portion 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 stretchable member 57 and the leg elastic stretchable member 58 that form a substantially continuous gather along the entire circumference of each peripheral portion are disposed, and the ventral side and / or the back of the waist elastic stretchable member are disposed. A plurality of waist elastic elastic members 59, 59... Are arranged on the side, and these waist elastic elastic members 59, 59. The displacement of 59 ... is the center of the ventral side Maximum and the disposable pants-type diaper is disclosed in.

Further, in Patent Document 5 shown below, as shown in FIG. 13, a gather having a large number of elastic bodies 60, 60,... Running 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

  The inventors of the present application have examined the arrangement of elastic elastic members that can fit a paper diaper without causing a sense of incongruity to the body and effectively prevent the diaper from slipping down. 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 the diaper slippage tends to be prominent 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 leg elastic member is substantially arranged along the leg line, but the leg elastic member is substantially formed with two or three elastic members having a close interval. As a bundle (hereinafter referred to as a bundle-like elastic elastic member), these elastic elastic members are arranged so as to form one line, and mainly function to close the gap between the leg opening edge and the body. It has only a function and does not have a function to make the absorber adhere to the body.

  Considering the above-mentioned patent document from the above viewpoint,

(1) In the disposable diaper according to the above-mentioned Patent Document 2, it is possible to prevent some diapers from falling down by arranging the downward curved gathers. There are few. In addition, no ingenuity has been made for the back body, and sliding prevention and adhesion to the body have not been sufficiently obtained.

(2) In the case of the disposable diaper according to the above-mentioned Patent Document 3, by arranging a plurality of elastic elastic members at the crotch part at intervals, leakage prevention at the crotch part is enhanced, The portion sandwiched between the second elastic elastic member disposed from the one side edge of the back body to the other side edge through the crotch and the waist elastic elastic member on the rear side is large. It is a region where no elastic elastic member is disposed, and in this region, the absorber cannot be brought into close contact with the body. Furthermore, the first elastic elastic member and the second elastic elastic member are arranged at regular intervals in the diaper longitudinal direction at the crotch part, but the contraction direction of the elastic elastic member arranged at the crotch part is along the crotch width direction. In addition, there is a problem that the stretching force generated in the crotch width direction causes the absorber to be shrunk.

(3) In the case of the disposable diaper according to Patent Document 4 above, the waist elastic elastic members disposed on the abdominal side and / or the back side are arranged in a curved shape displaced toward the crotch side, thereby generating in the lifting direction. The component force prevents the diaper from sliding down, and a certain effect can be expected. However, in order to generate the upward elastic force of the waist elastic elastic member, it is necessary that the position is fixed firmly at the waist side part (joining side edge). Therefore, if the curved portion of the waist elastic elastic member is on the fixed side, a downward force is applied to the waist side portion side, and slipping occurs. Therefore, a desired slip-off preventing effect cannot be obtained by simply displacing the waist elastic elastic member in a curved shape. In addition, the leg elastic elastic members are only arranged in a macro form along the leg cut line, and only have a function of closing the gap between the leg opening edge and the body. , It does not have a function for bringing the absorbent body into close contact with the body. In addition, the leg elastic elastic members are arranged so as to cross along the width direction at the crotch part, and there is a problem that the elastic force generated in the crotch width direction contracts the absorber.

(4) The disposable paper diaper according to Patent Document 5 is the same as Patent Document 4 in that the waist elastic elastic member is arranged in a curved shape displaced to the crotch part side, but the degree is different. That is, by making the amount of bending displacement up to the crotch, it seems that the entire disposable diaper is stretchable, but since the waist elastic elastic member is displaced in a curved shape, the waist elastic elastic member If the curved portion is on the fixed side, a downward force is applied to the lumbar side portion, and the flank portion is slipped off.

  Accordingly, the main problems of the present invention are to firstly make the structure capable of reliably preventing the paper diaper from slipping down when absorbing bodily fluids, and secondly to attach the paper diaper along the body line like shorts or briefs. Therefore, it is to make the wear comfortable and, as a result, to make the absorbent body in close contact with the body and to increase the leakage prevention effect. At the same time, it is to prevent the absorber from contracting and to improve the adhesion of the absorber to the body.

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. In a pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed by joining the front and back of the seat on both sides,
The exterior sheet extends from the one-side joint edge joining at least the front body and the back body to the crotch side in each of the front body and the back body, and bypasses the crotch side and joins the other side of the front body and the back body A plurality of curved elastic elastic member groups arranged at intervals without crossing each other, reaching the edge, and cutting the curved elastic elastic member group on the absorber to be discontinuous, A pants-type disposable diaper is provided in which the curved elastic elastic member group is cut at a position substantially along a side edge shape line of the absorber.

The present invention according to claim 2 includes 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 in a product state. In a pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed by joining at both sides,
The exterior sheet includes a waist elastic elastic member disposed around the waist opening, and a plurality of waist elastic elastic members arranged along the horizontal direction with an interval in the vertical direction between the front body and the back body. 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 the other side joint edge of the front body and the back body And a plurality of curved elastic stretchable member groups arranged at intervals without crossing each other, and the start and end of the curved elastic stretchable member group are the joint edges of the front body and the back body. Connected at a predetermined interval from the upper part to the lower part,
The curved elastic elastic member group is cut and discontinuous on the absorber, and the curved elastic elastic member group is cut at a position substantially along a side edge shape line of the absorber. A pants-type disposable diaper is provided.

  In the present invention according to the first and second aspects, in addition to the waist elastic elastic member and the waist elastic elastic member group, particularly in the back body of the exterior sheet, along the leg opening as in the conventional paper diaper. Without providing the elastic elastic members around the bundled legs around the front body and the back body, it extends from the one side joint edge that joins the front body and back body to the crotch side, bypassing the crotch side A plurality of curved elastic elastic members that reach the other side joining edge of the front body and the back body and are spaced apart from each other are joined at the start and end of the front body and the back body. They are arranged in such a manner that they are connected at a predetermined interval from the upper part to the lower part of the edge.

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

  On the other hand, on the absorber (not the absorbent main body), the curved elastic elastic member group is cut and discontinuous, and the curved elastic elastic member group is positioned substantially along the side edge shape line of the absorber. I'm trying to cut it. That is, by changing the cut position of the curved elastic elastic member according to the shape of the side edge of the absorber, the tension of the elastic elastic member is effectively maintained while preventing the absorber from shrinking, and the absorber is attached to the body. On the other hand, it becomes possible to hold tightly.

  According to a third aspect of the present invention, the absorber has a substantially hourglass shape in plan, and the curved elastic elastic member group is cut at a position substantially along a side edge shape line of the absorber. A pants-type disposable diaper according to any one of 1 and 2 is provided. In many pants-type disposable diapers, a substantially hourglass shape is adopted as a suitable absorbent body shape. In this case, the absorbent body is cut at a position substantially along the concave side edge curve of the absorbent body.

  According to a fourth aspect of the present invention, the cutting position of the curved elastic elastic member group on the absorbent body is in the range of 5 to 50 mm from the absorbent side edge to the inner side of the pants-type disposable according to any one of the first to third aspects. Diapers are provided. When the curved elastic elastic member is cut, a slight amount of retraction occurs, but it is desirable to cut the cut position on the inner side of the absorber side edge according to the degree of retraction. Specifically, the cutting position in this case is desirably in the range of 5 to 50 mm.

  As the present invention according to claim 5, there is provided a pants-type disposable diaper according to claims 1 to 4, wherein at least five of the curved elastic elastic member groups are arranged in each of the front body and the back body. In order to effectively prevent slippage of the paper diaper, it is desirable to arrange at least 5 curved elastic elastic member groups, preferably 7 or more.

  As the present invention according to claim 6, the curved elastic stretchable member group includes substantially the entire region of the exterior sheet surrounded by the side edge of the exterior sheet, the absorbent main body, and the waist elastic stretchable member group. The underpants type disposable diaper in any one of Claims 2-5 currently formed so that it may cover is provided.

  In the present invention according to claim 6, the curved elastic elastic member group includes the entire region of the outer sheet surrounded by the side edge of the outer sheet, the absorbent main body, and the waist elastic elastic member group. Since the entire area of the exterior sheet is substantially uniformly contracted by the curved elastic elastic member group, the inside of the area swells as in the conventional case, and the pocket-like A space is never formed. Thus, if there is no pocket-like space inside the pant-type disposable diaper (exterior sheet) that hinders wearing, when the wearer takes off the pant-type disposable diaper, there are toes and heels on the inside. Since it becomes difficult to catch, it becomes easy to wear the exterior sheet of a pants-type disposable diaper.

  As the present invention according to claim 7, the curved elastic stretchable member group disposed on the front body side includes the curved elastic stretchable member group and the absorbent main body side edge at the intersection with the side edge of the absorbent main body. And the curved elastic elastic member group disposed on the back body side has an absorptive angle crossing angle of 30 ° or less at the intersection with the side edge of the absorbent main body. An underpants-type disposable diaper according to any one of claims 1 to 6, wherein an acute angle crossing angle with the main body side edge is 35 ° or more.

  In the present invention according to claim 7, the arrangement pattern of the curved elastic elastic member group arranged on the front body side is different from the arrangement pattern of the curved elastic elastic member group arranged on the back body side. is there. Specifically, the curved elastic stretchable member group arranged on the front body side has an acute angle crossing angle between the curved elastic stretchable member group and the absorbent main body side edge at the intersection with the side edge of the absorbent main body. The curved elastic stretchable member group disposed on the back body side of the curved elastic stretch member group is 30 ° or less, and the curved elastic stretchable member group and the absorbent main body side at the intersection with the side edge of the absorbent main body. The curve arrangement is such that the acute angle crossing angle with the 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, 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 stretchable 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 sheet is wrapped so as to wrap the collar portion. 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 present invention according to claim 8 provides the pants-type disposable diaper according to any one of claims 2 to 7, wherein the waist elastic elastic member group is cut and discontinuous on the absorber.

  In the present invention according to claim 8, the waist elastic elastic member group is cut and discontinuous on the absorber. Therefore, it is possible to reliably prevent the absorbent body from shrinking in the width direction even in the front body and the back body.

  As described above in detail, according to the present invention, since all the elastic elastic members are arranged with the side joint edge as the starting end, the tightening force at the side joint edge can be set relatively high. Since all the elastic elastic members exhibit the elastic force with the side joint edge as a fixed point, 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.

  In addition, for the curved elastic stretchable member, the curved elastic stretchable member group is cut and discontinuous on the absorbent body so as not to cause shrinkage due to the introduction of shrinkage force from the elastic stretchable member to the absorbent body. Since the curved elastic elastic member group is cut at a position substantially along the side edge shape line of the absorber, the tension of the elastic elastic member is effectively maintained and absorbed while preventing the absorber from being contracted. It becomes possible to hold the body in close contact with the body.

  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 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 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 in a substantially hourglass shape in the illustrated example, and by narrowing the width of the absorbent body in the crotch, the contact with the crotch portion is weakened and the wearer feels irritated. Not to give. 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)
As shown in FIGS. 5 and 6, the exterior sheet 20 is a non-woven sheet having a two-layer structure including an upper layer nonwoven fabric 20 </ b> A and a lower layer nonwoven fabric 20 </ b> B, and various elastic elastic members between the upper layer nonwoven fabric 20 </ b> A and the lower layer nonwoven fabric 20 </ b> B. 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, in the developed shape shown in FIG. 5, waist elastic elastic members 24, 24... The back body B has a plurality of waist elastic elastic member groups 25, 25,... Arranged in the horizontal direction at intervals in the vertical direction, and each of the front body F and the back body B has the waist Separately from the elastically elastic members 25, 25..., The one side joint edge that joins the front body F and the back body B extends to the crotch side, and the other side joint of the front body and the back body bypasses the crotch side. It is provided with a plurality of curved elastic elastic member groups 26, 28, ... that reach the edge and are spaced from each other without crossing each other. The curved elastic elastic member groups 26, 28, ... are cut by the absorbent main body 10 and are discontinuous. In the exterior sheet 20, so-called leg-hole elastic elastic members that are substantially continuous along the leg-cut line 29 are 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. It is a rubber-like elastic expansion / contraction member, which applies a horizontal expansion / contraction force to the waist portions of the front body F and the back body B, respectively, to bring the paper diaper into 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 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 line 29 and are arranged so as to bypass the crotch part and reach the other side side joint edge 22 while being substantially along the leg leg cutting line 29 on the opposite side. Then, there are nine rubber thread elastic elastic members, and these dorsal curved elastic elastic member groups 26, 26... Are arranged at intervals without crossing each other, and then on the absorber 13 (in oblique lines) In the region shown), the dorsal curved elastic elastic member groups 26, 26... Are cut and made discontinuous, and the dorsal curved elastic elastic member groups 26, 26. Position along the polygonal shape line) It has been disconnected. Discontinuity of the curved elastic elastic members 26 (and a later-described ventral elastic elastic member 28) is opposed to the embossing cutter roll after various elastic elastic members are arranged on the exterior sheet 20 by a known method described later. A method in which an exterior sheet is passed between the rolls and the elastic elastic members 26, 28,... Existing in a predetermined range (range X in the figure) are finely cut by pressure or heating with the embossing cutter roll. According to. This will be further described later.

  The cutting positions of the curved elastic elastic members 26, 26... (And the later-described ventral elastic elastic members 28, 28,...) On the absorbent body 13 are inward from the side edge of the absorbent body 13 in consideration of the drawing of the elastic elastic members. It is desirable that the thickness be in the range of 5 to 50 mm.

  The dorsal curved elastic elastic member groups 26, 26,... Are different in arrangement from 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 disposed, and the entire substantially triangular region Trb of the exterior sheet 20 surrounded by the side edge of the exterior sheet 20, the absorbent main body 10, and the waist elastic elastic member groups 25, 25,. It is formed to cover almost. Therefore, in the substantially triangular region Trb, the dorsal elastic elastic members 26, 26,... Are contracted almost uniformly, so that the inside of the substantially triangular region Trb swells to form a pocket-like space. There is no end. If there is no pocket-like space on the inside of the diaper (exterior sheet) that hinders wearing, when the wearer takes off the pants-type disposable diaper, the toes and heels are less likely to get caught inside the pants. It becomes easy to wear the exterior sheet of a disposable diaper. Further, the substantially triangular region Trb in the exterior sheet 20 is covered and contracted by the curved elastic elastic members 26, 26..., So that the exterior sheet 20 is fitted in accordance with the shape of the body unevenness or bulge. Can be expanded and contracted. That is, on the rear body B side of the diaper 1, the exterior sheet 20 can be brought into close contact with the buttocks of the body.

  The start and end of the dorsal curved elastic 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 back 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. 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 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 shown in the illustrated example, if the elastic members 26, 26,... 73% can be applied 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.

  On the other hand, in the front body 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. Extends from the leg to the leg crotch line 29 to reach the crotch part, bypasses the crotch part, reaches the other side side joint edge 21 along the leg leg cut line 29 on the opposite side, and is spaced without crossing. Are a plurality of thread-like elastic elastic members in the illustrated example, and these ventral curved elastic elastic member groups 28, 28... Are arranged at intervals without crossing each other. After that, on the absorber 13 (the region is indicated by hatching), the abdomen curved elastic elastic member groups 28, 28... Are cut and discontinuous, and the abdomen curved elastic elastic member groups 28, 28. Side of the absorber 13 It is cut with substantially along a position to shape line (concave polygonal lines). The ventral curved elastic elastic member groups 28, 28... Are also 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, and the entire substantially triangular region Trf of the exterior sheet 20 surrounded by the side edge of the exterior sheet 20, the absorbent main body 10, and the waist elastic elastic member groups 25, 25,. It is formed to cover almost. The effect of this is as described above.

  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.

  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 expansion / contraction member groups 28, 28,... Are arranged with a relatively tight inclination angle, and the expansion members 28, 28,. As a result, 90% of the applied expansion / contraction force can be applied as an upward component force, and slipping of the paper diaper can be effectively prevented.

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.

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

  As shown in FIG. 6, the outer sheet 20 is manufactured by supplying the upper layer nonwoven fabric 20A to the upper side of the nip roller portion 30 and the lower layer nonwoven fabric 20B to the lower side, and the upper layer nonwoven fabric 20A and the lower layer nonwoven fabric 20B. Are provided with 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), and the exterior sheet 20 is continuously provided. Assembled.

  Here, the waist elastic elastic members 24, 24... And the waist elastic elastic members 25, 25... Are linearly introduced along the line direction, whereas the curved elastic elastic members 26, 28. Then, it is 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.

  The waist elastic elastic member 24, the waist elastic elastic member 25, and the curved elastic elastic members 26, 28, are fixed to the sheet at least one of the upper nonwoven fabric 20A and the lower nonwoven fabric 20B, in the illustrated example, the lower layer. The hot melt adhesive is fixed onto the surface of the nonwoven fabric 20B by curtain coating with a coater 33. In this embodiment, a curtain coating method is adopted in which a hot melt adhesive is curtain coated on the elastic elastic member arrangement region on the sheet side, and the elastic elastic member is introduced and fixed thereon. Alternatively, a control seam system in which a hot-melt adhesive is applied to the sheet and then introduced onto the sheet to fix the elastic elastic member, or a combination thereof may be employed.

  In order to cut the curved elastic elastic members 26, 28,... At a crossing position across the side edge of the absorbent body 13 and make them discontinuous, Japanese Patent Laid-Open Nos. 2002-35029, 2002-178428, and 2002 The cutting method described in Japanese Patent No. -273808 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 an opposing roll 35 opposite to the embossed heat roll 34, and the curved elastic elastic members 26, 28,. It cut | disconnects by at least one of the pressurization between 34 convex parts and the opposing roll 35, and a heating. Note that X in FIGS. 5 and 6B indicates the cutting range.

  As shown in FIG. 7 (a), the opposing roll 35 is preferably separated from the embossed heat roll 34 so as to contact only the embossed portion 34a of the embossed heat roll 34. As shown in (b), when the embossed portion 34a is lowered, it comes into contact with the opposing roll 35. In addition, on the surface of the embossed portion 34a, small convex portions 40 to 43 as exemplified in FIG. 8 are further formed in the defined region 34b in a substantially hourglass shape. The front end surface of .about.43 comes into contact with the opposing roll 35. FIG.

  Examples of preferred emboss patterns are shown in FIGS. 8 (a) and 8 (b). FIG. 8A shows an emboss pattern in which a plurality of linear convex portions are arranged in a staggered manner. A row of convex portions arranged by arranging linear convex portions 40 of length S1 and width W1 in the axial direction (black arrow direction) of the embossing heat roll 34 with a distance D1 and the same length S1 as the convex portions 40 , The width W1 of the convex portions 41, 41 in the circumferential direction of the embossed heat roll 34 (in the direction of the white arrow) is spaced from the convex portion 40 by a distance M1, and the lengthwise center line of the convex portion 41 is 2 / It is constituted by a pattern in which convex row groups arranged so as to pass through the points of D1 are alternately repeated. FIG. 8B shows a pattern in which rhombic convex portions are arranged in a staggered manner. A row of convex portions arranged such that the rhombic convex portions 42 and 42 having the major axis S2 and the minor axis W2 are arranged in the axial direction (black arrow direction) of the embossing heat roll 34 with a distance D2 therebetween, and the same as the convex portion 42 The rhombus-shaped convex portions 43, 43 are in the circumferential surface direction of the embossed heat roll 34 (in the direction of the white arrow), the convex portion 42 is separated from the distance M2, and the short axis of the convex portion 42 corresponds to a point of 2 / D2. The pattern of the convex part group arrange | positioned so that it may consist of the pattern which repeated alternately.

  The length S1 of the linear protrusion and the long axis S2 of the rhombus are preferably in the range of 1 to 25 mm, and more preferably 5 to 25 mm. Further, it is preferable that the separation distances D1 and S1 between the adjacent convex portions are the same or S1 is longer. Because of the staggered arrangement, the elastic member positioned between the convex portions 40 can be reliably cut by the convex portions 41. Similarly, in D2 and S2, it is preferable that D2 ≦ S2. If S1 or S2 is shorter than 1 mm, the elastic member may not be cut in some cases. If it is longer than 25 mm, the area of the seal portion increases. This may cause the touch feeling to deteriorate. Therefore, the range of D1 and D2 is also preferably in the range of 1 to 25 mm, and D1 is more preferably 3 to 25 mm. When the convex part is a rhombus, if the corners of the convex parts adjacent to each other in the roll circumferential direction overlap only slightly when viewed from the direction in which the elastic member is attached, the elastic member may escape from the seal part and cannot be cut. D2 is more preferably 3 to 10 mm.

  The width W1 of the linear protrusion and the short axis W2 of the rhombus are preferably 0.5 to 15 mm. If it is thinner than 0.5 mm, the elastic member may not be cut. If it is thicker than 15 mm, the area of the seal portion becomes too large, and the feeling of touch may deteriorate. For W2, the lower limit is more preferably 1 mm or more.

  The distance between the rows of the convex group is not particularly limited, but M1 or M2 is preferably 5 to 25 mm. The shape of the convex portion is not limited to the above-mentioned linear shape and rhombus shape, but can be applied to diagonal lines, circular shapes, triangular shapes, star shapes, other polygonal shapes, and the like. It can also be changed according to each row of convex portions.

(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 planar shape of the absorber 13 is substantially hourglass-shaped, but the planar shape may be a shape such as a bowl shape.

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. 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 explanatory drawing of the operation | movement aspect of an embossing heat roll and an opposing roll. (a), (b) is explanatory drawing which shows the example of the embossing pattern of a staggered arrangement | sequence. 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.

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 (8)

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. In a pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed,
The exterior sheet extends from the one-side joint edge joining at least the front body and the back body to the crotch side in each of the front body and the back body, and bypasses the crotch side and joins the other side of the front body and the back body A plurality of curved elastic elastic member groups arranged at intervals without crossing each other, reaching the edge, and cutting the curved elastic elastic member group on the absorber to be discontinuous, The pants-type disposable diaper, wherein the curved elastic elastic member group is cut at a position substantially along a side edge shape line of the absorber. 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. In a pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed,
The exterior sheet includes a waist elastic elastic member disposed around the waist opening, and a plurality of waist elastic elastic members arranged along the horizontal direction with an interval in the vertical direction between the front body and the back body. 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 the other side joint edge of the front body and the back body And a plurality of curved elastic stretchable member groups arranged at intervals without crossing each other, and the start and end of the curved elastic stretchable member group are the joint edges of the front body and the back body. Connected at a predetermined interval from the upper part to the lower part,
The curved elastic elastic member group is cut and discontinuous on the absorber, and the curved elastic elastic member group is cut at a position substantially along a side edge shape line of the absorber. A pants-type disposable diaper.   The underpants according to claim 1, wherein the absorbent body has a substantially hourglass shape, and the curved elastic elastic member group is cut at a position substantially along a side edge shape line of the absorbent body. Type disposable diaper.   The pants-type disposable diaper according to any one of claims 1 to 3, wherein a cutting position of the curved elastic stretchable member group on the absorbent body is in a range of 5 to 50 mm inward from the side edge of the absorbent body.   5. The pants-type disposable diaper according to claim 1, wherein at least five of the curved elastic elastic member groups are arranged in each of the front body and the back body.   The curved elastic elastic member group is formed so as to substantially cover the entire region of the outer sheet surrounded by a side edge of the outer sheet, the absorbent main body, and the waist elastic elastic member group. The underpants type disposable diaper in any one of 2-5.   The curved elastic elastic member group arranged on the front body side has an acute angle crossing angle of 30 ° or less between the curved elastic elastic member group and the absorbent main body side edge at the intersection with the side edge of the absorbent main body. And the curved elastic stretchable member group disposed on the back body side has an acute angle crossing angle between the curved elastic stretchable member group and the absorbent main body side edge at the intersection with the side edge of the absorbent main body. The pants-type disposable diaper according to any one of claims 1 to 6, wherein is set to 35 ° or more.   The pants-type disposable diaper according to any one of claims 2 to 7, wherein the waist elastic elastic member group is cut and discontinuous on the absorbent body.

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