JP5024915B2 - Pants-type disposable diapers - Google Patents

Pants-type disposable diapers Download PDF

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JP5024915B2
JP5024915B2 JP2005023274A JP2005023274A JP5024915B2 JP 5024915 B2 JP5024915 B2 JP 5024915B2 JP 2005023274 A JP2005023274 A JP 2005023274A JP 2005023274 A JP2005023274 A JP 2005023274A JP 5024915 B2 JP5024915 B2 JP 5024915B2
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elastic member
body
side
crotch
curved
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JP2006043415A (en
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敦子 白井
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大王製紙株式会社
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Priority to JP2004194522 priority
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Priority claimed from EP20050765276 external-priority patent/EP1787610B1/en
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  The present invention relates to a pants-type disposable diaper that is excellent in fit to the body and prevention of diaper slipping, and has good appearance and comfort.

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

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

As in the case of the disposable diapers described above, when elastic elastic members are provided independently at the three parts of the waist opening, leg opening, and waistline, the minimum fit required for the disposable diaper is obtained. However, user satisfaction has not always been achieved.
In view of such a problem, in Patent Document 2 below, as shown in FIG. 9, as a gather on the abdomen side or the back side, or both, A disposable diaper having a downward curved gather 54 formed so as to bend toward the crotch portion and having the lowermost portion of the downward curved gather 54 located below the uppermost end of the leg opening is disclosed. .

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

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

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

The inventors of the present application have examined an elastic member arrangement that allows a disposable diaper to be fitted to the body without causing a sense of incongruity to the body, as well as an effective prevention of diaper slipping. 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, the arrangement pattern of the elastic member must be in consideration of the three-dimensional shape of the collar.
(4) The leg-hole elastic members are disposed substantially along the leg-line, but the leg-hole elastic members are substantially equal to each other with two or three elastic elastic members closely spaced. As a bundle (hereinafter referred to as a bundle-like elastic member), these elastic elastic members are arranged so as to form a single line, and are mainly responsible for the function of closing the gap between the leg opening edge and the body. There is no 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 stretchable elastic member disposed so as to reach the other side edge portion from the one side edge portion of the back body through the crotch portion and the waist elastic member on the rear side is largely elastic member Is an area where no absorber is disposed, and in this area, the absorber cannot be brought into close contact with the body. Furthermore, in the crotch part, the first elastic elastic member and the second elastic elastic member are arranged at regular intervals in the diaper longitudinal direction. The contraction direction of the elastic member arranged in 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, the waistline elastic member disposed on the abdominal side and / or the back side is disposed in a curved shape that is displaced toward the crotch side, thereby generating in the lifting direction. The component force prevents the paper diaper from sliding down, and a certain effect can be expected. However, in order to generate the upward component of the waist elastic member, it is necessary that the waist side part (joining side edge) is fixed in position, but the waist elastic member is displaced into a curved shape. Therefore, if the curved portion of the waistline elastic member is on the fixed side, a downward force is applied to the waistside side rather, and slipping occurs. Accordingly, the desired slip-off preventing effect cannot be obtained by simply displacing the waist elastic member in a curved shape. In addition, the leg elastic member is only arranged in a macro form along the leg cut line, and has only a function for closing the gap between the leg opening edge and the body, It does not have a function for bringing the absorber into close contact with the body. Moreover, the leg-hole elastic member is disposed so as to cross the crotch portion along the width direction, and there is a problem that the elastic force generated in the crotch width direction causes the absorbent body to contract.
(4) The disposable paper diaper according to Patent Document 5 is the same as that of Patent Document 4 in that the waist elastic member is arranged in a curved shape displaced to the crotch part side, but the degree is different. That is, it seems that the entire amount of the disposable diaper is stretchable by setting the amount of bending displacement up to the crotch, but the waist elastic member is displaced into a curved shape, so that the bending portion of the waist elastic member If it becomes a fixed side, the downward force will act on the waist side part side rather, and a slip-off will arise in this waist side part.
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 it comfortable to wear and, as a result, to make the absorber adhere to the body so that the leakage preventing effect is enhanced. The third is to improve ease of wearing.

In order to solve the above-mentioned problem, the present invention according to claim 1 includes: an absorbent main body including an absorbent body having a substantially square planar shape ; 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 in a product state by being folded at the crotch lower part of the diaper and joining the front and back bodies of the exterior sheet on both sides ,
The exterior sheet includes a waist elastic member arranged around the waist opening, and a plurality of waist elastic members arranged along the horizontal direction with a space in the vertical direction between the front body and the back body. In addition, each of the front body and the back body extends from the one side joint edge that joins the front body and the back body to the crotch side, bypasses the crotch side and reaches the other side joint edge of the front body and the back body And a plurality of curved elastic member groups arranged at intervals without crossing each other, and the start and end of the curved elastic member groups are substantially from the upper part to the lower part of the joint edge between the front body and the rear body. And the arrangement interval of the curved elastic member group at the joint edge between the front body and the back body is substantially the same as the arrangement interval of the curved elastic member group at the crotch part. and 2 Apart three approximately resilient and elastic members as substantially Ichitaba in close without a leg elastic member disposed along the leg line,
The curved elastic member group arranged on the back body side is biased toward the front body side with respect to the crotch lower part folding line of the diaper in the crotch part,
The curved elastic member group disposed on the front body side has an acute angle crossing angle between the curved elastic member group and the absorbent main body side edge of 28 ° or less and 20 ° at the intersection with the side edge of the absorbent main body . The curved elastic member group disposed on the back body side and having the above-mentioned configuration has an acute angle crossing angle between the curved elastic member group and the absorbent main body side edge at the intersection with the side edge of the absorbent main body. A pants-type disposable diaper characterized by being 45 ° or more and 60 ° or less is provided.

In the present invention according to the first aspect, particularly in the rear body of the exterior sheet, in addition to the waist elastic member and the waist elastic member group, like the conventional paper diaper, it is disposed along the leg opening. Without a bundle of leg elastic members, the front and back bodies extend from the one-side joint edge that joins the front and back bodies to the crotch side, bypassing the crotch side, and the front and back bodies A plurality of curved elastic member groups that are arranged at intervals without crossing each other, and whose start and end are substantially from the upper part to the lower part of the joint edge between the front body and the back body It was made to arrange | position in the aspect connected with the predetermined space | interval over the range.
First, in the disposable diaper of the present invention, the curved elastic member group is arranged with an elastic member different from the waist elastic member as a joining edge between the front body and the back body. As a result, the waist elastic member and the curved elastic member group are gathered at a joint edge (hereinafter also referred to as a side joint edge) between the front body and the back body with a high linear density. The curved elastic member group is firmly fixed and can be applied with an upward force, so that the curved elastic member group prevents the paper diaper from slipping down and holds the exterior sheet in close contact with the body. can do. Here, the curved elastic member group is different in function and arrangement from the conventional leg-hole elastic member in that it is not arranged so as to form a bundle of lines.

In the present invention, the arrangement pattern of the curved elastic member group arranged on the front body side is different from the arrangement pattern of the curved elastic member group arranged on the rear body side. Specifically, in the curved elastic member group disposed on the front body side, an acute angle crossing angle between the curved elastic member group and the absorbent main body side edge is 28 at the intersection with the side edge of the absorbent main body. The curved elastic member group disposed on the back body side has a curved arrangement with an angle of 20 ° or less, and the curved elastic member group and the absorbent body side edge at the intersection with the side edge of the absorbent body. And an acute angle side crossing angle of 45 ° to 60 ° .

  Since the front part of the body does not have a bulge that becomes like a buttocks compared to the back side of the body, slipping of disposable diapers tends to be noticeable mainly on the front body side. It is assumed that the elastic member group is arranged.

  On the other hand, on the back body side, emphasis is placed on the fit to the body rather than slipping off of the paper diaper, and in order to fit the exterior sheet to the bulge shape of the buttock, the stretching force in the direction along the bulge of the buttock as much as possible In order to act, the elastic member group is arranged at a relatively gentle inclination angle.

  Further, according to the present invention, the curved elastic member group disposed on the back body side is biased toward the front body side in the crotch part with reference to the crotch part folding line of the diaper. It is possible to eliminate slippage of the paper diaper that occurs on the buttock side and to fit the exterior sheet to the body side by eliminating slack in the buttocks.

As the present invention according to claim 2, there is provided the pants-type disposable diaper according to claim 1, wherein at least five or more of the curved elastic member groups are arranged in 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 member groups, preferably 7 or more curved elastic member groups.
As the present invention according to claim 3, in the joint edge portion of the front body and the back body, the elastic member located closest to the waist opening in the group of curved elastic members arranged on the front body side is a waist portion. The underpants-type disposable diaper according to any one of claims 1 and 2, wherein a distance of the elastic member from the lowermost elastic member is within 20 mm.

  According to the third aspect of the present invention, the elastic member located closest to the waist opening in the group of curved elastic members arranged on the front body side is bonded to the waist portion at the joint edge between the front body and the back body. The distance from the lowermost elastic member of the elastic member is arranged within 20 mm. That is, the position at the joint side edge of the uppermost elastic member in the group of curved elastic members is arranged so as to be quite close to the waist. As a result, when the wearer grips the side of the waist part and pulls it upward during wearing, the front body side of the disposable diaper is easily pulled upward by the elastic force of the curved elastic member, and the ease of wearing is improved. .

  As the present invention according to claim 4, in the joint edge portion of the front body and the back body, the elastic member located closest to the waist opening in the curved elastic member group disposed on the back body side is a waist portion. The pants-type disposable diaper according to any one of claims 1 to 3, wherein a distance from the lowermost elastic member of the elastic member is within 20 mm. According to the fourth aspect of the present invention, when the wearer grasps the side of the waist part and pulls it upward, the rear body side of the disposable diaper is moved upward by the elastic force of the curved elastic member. It becomes easy to pull it up and the ease of wearing is improved.

  As the present invention according to claim 5, in the curved elastic member group, the elastic member located closest to the crotch side has a distance from the crotch lower folding line of the diaper within ± 50 mm. The described pants-type disposable diaper is provided.

  In the present invention described in claim 5, the elastic member located on the most crotch side of the group of curved elastic members is such that the distance from the crotch lower folding line of the diaper is within ± 50 mm, that is, the group of curved elastic members is It is arranged so as to bypass the crotch vicinity region exactly.

  By arranging the line drawn by the curved elastic member group in a curved shape of a large wave that bypasses the region near the crotch portion as described above, the exterior sheet can be tightly held with respect to the body.

  As a sixth aspect of the present invention according to any one of the first to fifth aspects, the curved elastic member group disposed in the front body and the back body is changed in an arcuate curve at a crotch part or a detour part on the crotch side. A pants-type disposable diaper according to crab is provided.

  In the present invention as set forth in claim 6, the bending member group changes its direction in an arcuate curve at the crotch part or the detour part on the crotch side. That is, the force acting in the width direction of the disposable diaper can be minimized by changing the direction to the arcuate curve, and the shrinkage of the absorber in the width direction can be prevented.

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

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

  The present invention according to claim 8 provides the pants-type disposable diaper according to any one of claims 1 to 7, wherein the waist elastic member group is cut and discontinuous on the absorber.

  In the present invention according to claim 8, the waist elastic member group is cut and discontinuous on the absorber. Therefore, it is possible to reliably prevent the absorber from being contracted in the width direction.

As the present invention according to claim 9, the most crotch side elastic member in the curved elastic member group disposed on the front body side and the most crotch side elasticity in the curved elastic member group disposed on the back body side. The member is provided with a pants-type disposable diaper according to any one of claims 1 to 8, which are close to each other at the crotch portion without intersecting each other.
In the invention according to claim 9, the most crotch side elastic member in the curved elastic member group arranged on the front body side and the most crotch side in the curved elastic member group arranged on the back body side. The elastic members are arranged close to each other without crossing each other at the crotch part. Therefore, in the crotch part, the absorbent main body is pressed and adhered to the body side with equal pressure by the curved elastic member group, so that a gap between the body and the body is sealed, and a high leakage prevention effect is exhibited.

  As described above in detail, according to the present invention, since all the 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 the elastic member exhibits a stretching 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. Furthermore, ease of wearing is improved.

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

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First embodiment]
FIG. 1 is a product state appearance view of a pants-type disposable paper diaper 1 according to the present invention, FIG. 2 is an assembled view in a developed state, and FIG. 3 is a developed view of an exterior sheet.
As shown in FIGS. 1 and 2, the present pants-type disposable paper diaper 1 (hereinafter simply referred to as a paper diaper) is provided between a liquid-permeable surface sheet 11 made of nonwoven fabric and a leak-proof sheet 12 made of polyethylene or the like. The absorbent main body 10 interspersed with an absorbent body 13 such as cotton pulp, and the exterior sheet 20 provided integrally on the outer surface side of the absorbent main body 10, and the predecessor of the exterior sheet 20 in a product state A pants-type disposable diaper having a structure in which a waist opening and a pair of left and right leg openings are formed by joining a back and a back body on both sides.

Hereinafter, the absorbent main body 10, the exterior sheet 20, and the assembly structure thereof will be described in this order.
(Structure of the absorbent main body 10)
First, an example of the structure of the absorbent main body 10 will be described in detail based on FIGS. 5 and 6.

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

  In the illustrated example, the absorbent body 13 is formed with a substantially square shape in plan view, and the width dimension thereof is a dimension width that does not give the wearer a feeling of gore by hitting the crotch portion. The absorbent body 13 is surrounded by 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 top sheet 11 extends to the back side of the absorbent body 13 around the side edge of the absorbent body 13.

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

  On the other hand, as shown in FIG. 6, the gathered nonwoven fabric 15 that forms the three-dimensional gathered BS is a nonwoven fabric made into a double sheet by folding, and the side edge of the absorbent body 13 that is wound 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. 6 (B), the thread-like elastic stretch members 16, 16... Are used to form a three-dimensional gather BS by raising the nonwoven fabric portion protruding from the absorber side edge 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 only synthetic fibers such as polyethylene or polypropylene, but also synthetic fibers such as polyester and amide, as well as recycled fibers such as rayon and cupra, Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a non-woven fabric with a low basis weight and excellent air permeability. Further, with respect to the gathered nonwoven fabric 15, in order to prevent the transmission of urine and the like, to prevent fogging and to improve the feel to the skin (dry feeling), a silicon-based, paraffin-metal-based, alkylchromic chromoid-based water repellent It is desirable to use a water-repellent non-woven fabric coated with such as.

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

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

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

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

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

  The starting and terminating ends of the dorsal curved elastic member groups 26, 26... Are connected at a predetermined interval from the upper part to the lower part of the joining edge of the front body F and the rear body B, At the intersection with the edge, the acute angle intersection angle α between the dorsal curved elastic member group 26, 26... And the absorbent main body 10 side edge is 35 ° or more, preferably 40 ° or more, more preferably 45 ° or more. Are arranged in an arrangement pattern. Incidentally, in the example of illustration, it arrange | positions so that the crossing angle (alpha) may be 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 side joint edges 21 and 22 of the front body F and the back body B, the elastic member 26 i located closest to the waist opening in the dorsal curved elastic member groups 26, 26. members 24, 24 ... distance S B from the lowermost elastic member 24 O in is arranged to be within 20 mm. When the wearer grasps the side of the waist part and pulls it upward when wearing it, the elastic force of the curved elastic members 26, 26... Makes it easier to pull the rear body B side of the paper diaper upward, so that ease of wearing is improved. become.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

On the other hand, with respect to the intermediate zone M between the waist elastic elastic members 25, 25 ... of the front body and the waist elastic elastic members 25, 25 ... of the back body, at least one side of the upper nonwoven fabric 20A and the lower nonwoven fabric 20B. In the illustrated example, the lower-layer nonwoven fabric 20B is bead-coated by the coater 33 so as to form a plurality of rows along the horizontal direction at intervals in the vertical direction, and the curved elastic elastic members 26, 28,. In the intermediate zone M, it is fixed by a hot melt adhesive applied to the lower layer nonwoven fabric 20B.
In order to cut the curved elastic members 26, 28, ... on the absorbent main body 10 and make them discontinuous, it is described in JP 2002-35029, JP 2002-178428, and JP 2002-273808. The cutting method to be used is preferably employed. The elastic stretchable member cutting method described in the publication basically has a plurality of convex portions arranged on the surface after manufacturing a laminated sheet 20 ′ to be the exterior sheet 20, as shown in FIG. The laminated sheet 20 ′ is passed between an embossed heat roll 34 and a counter roll 35 facing the embossed heat roll 34, and the curved elastic members 26, 28,. It cut | disconnects by at least one of the pressurization between the convex part and the opposing roll 35, and a heating. Note that the X region in FIG. 7B indicates the cutting range.

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

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

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

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

Claims (9)

  1. It consists of an absorbent main body including an absorbent body having a substantially rectangular planar shape and an exterior sheet integrally provided on the outer surface side of the absorbent main body, and is folded at the crotch lower part of the diaper and the front body and the rear of the exterior sheet In a pants-type disposable diaper in which a waist opening and a pair of left and right leg openings are formed in a product state by joining the body on both sides,
    The exterior sheet includes a waist elastic member arranged around the waist opening, and a plurality of waist elastic members arranged along the horizontal direction with a space in the vertical direction between the front body and the back body. In addition, each of the front body and the back body extends from the one side joint edge that joins the front body and the back body to the crotch side, bypasses the crotch side and reaches the other side joint edge of the front body and the back body And a plurality of curved elastic member groups arranged at intervals without crossing each other, and the start and end of the curved elastic member groups are substantially from the upper part to the lower part of the joint edge between the front body and the rear body. And the arrangement interval of the curved elastic member group at the joint edge between the front body and the back body is substantially the same as the arrangement interval of the curved elastic member group at the crotch part. and 2 Apart three approximately resilient and elastic members as substantially Ichitaba in close without a leg elastic member disposed along the leg line,
    The curved elastic member group arranged on the back body side is biased toward the front body side with respect to the crotch lower part folding line of the diaper in the crotch part,
    The curved elastic member group disposed on the front body side has an acute angle crossing angle between the curved elastic member group and the absorbent main body side edge of 28 ° or less and 20 ° at the intersection with the side edge of the absorbent main body . The curved elastic member group disposed on the back body side and having the above-mentioned configuration has an acute angle crossing angle between the curved elastic member group and the absorbent main body side edge at the intersection with the side edge of the absorbent main body. A pants-type disposable diaper characterized by being 45 ° or more and 60 ° or less .
  2.   The pants-type disposable diaper according to claim 1, wherein at least five of the curved elastic member groups are arranged in each of the front body and the back body.
  3.   In the joint edge part of the front body and the back body, the elastic member located closest to the waist opening in the curved elastic member group arranged on the front body side is from the lowermost elastic member of the waist elastic member. The underpants-type disposable diaper according to claim 1, wherein the distance is within 20 mm.
  4.   In the joint edge part of the front body and the back body, the elastic member located closest to the waist opening in the curved elastic member group disposed on the back body side is from the lowermost elastic member of the waist elastic member. The underpants-type disposable diaper according to any one of claims 1 to 3, wherein the distance is 20 mm or less.
  5.   The pants-type disposable diaper according to any one of claims 1 to 4, wherein the elastic member located on the crotch side of the group of curved elastic members has a distance from the crotch lower folding line of the diaper within ± 50 mm.
  6.   The pants-type disposable diaper according to any one of claims 1 to 5, wherein the curved elastic member group disposed in the front body and the back body is turned in an arcuate curved shape at a crotch part or a detour part on the crotch side.
  7.   The pants-type disposable diaper according to claim 1, wherein the curved elastic member group is cut and discontinuous on the absorbent body.
  8.   The pants-type disposable diaper according to any one of claims 1 to 7, wherein the waist elastic member group is cut and discontinuous on the absorbent body.
  9.   The most crotch lower elastic member in the curved elastic member group arranged on the front body side and the most crotch lower elastic member in the curved elastic member group arranged on the rear body side cross each other at the crotch part. The underpants type disposable diaper in any one of Claims 1-8 which adjoin without doing.
JP2005023274A 2004-06-30 2005-01-31 Pants-type disposable diapers Active JP5024915B2 (en)

Priority Applications (3)

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JP2004194522 2004-06-30
JP2004194522 2004-06-30
JP2005023274A JP5024915B2 (en) 2004-06-30 2005-01-31 Pants-type disposable diapers

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2005023274A JP5024915B2 (en) 2004-06-30 2005-01-31 Pants-type disposable diapers
EP20050765276 EP1787610B1 (en) 2004-06-30 2005-06-30 Pants-type disposable diaper
CN 200580021447 CN1976657B (en) 2004-06-30 2005-06-30 Pants-type disposable diaper
US11/631,145 US8057456B2 (en) 2004-06-30 2005-06-30 Pants-type disposable diaper
PCT/JP2005/012102 WO2006004002A1 (en) 2004-06-30 2005-06-30 Pants-type disposable diaper

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JP4350791B2 (en) * 2006-03-31 2009-10-21 大王製紙株式会社 Pants-type disposable diaper cover
JP4892438B2 (en) * 2007-08-31 2012-03-07 大王製紙株式会社 Disposable disposable diaper and method for producing the same
JP5620645B2 (en) * 2009-02-27 2014-11-05 大王製紙株式会社 Pants-type disposable diaper
JP5548538B2 (en) * 2010-06-30 2014-07-16 大王製紙株式会社 Pants-type disposable diaper
JP5667806B2 (en) * 2010-07-27 2015-02-12 大王製紙株式会社 Pants-type disposable diaper
JP5806845B2 (en) * 2011-04-25 2015-11-10 花王株式会社 Pants-type absorbent article
JP5806846B2 (en) * 2011-04-25 2015-11-10 花王株式会社 Pants-type absorbent article
JP6008512B2 (en) * 2012-02-24 2016-10-19 花王株式会社 Pants-type absorbent article
JP6256128B2 (en) * 2014-03-14 2018-01-10 王子ホールディングス株式会社 Pants-type disposable diapers

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JP3175912B2 (en) * 1995-10-04 2001-06-11 花王株式会社 Disposable pants-type diaper
JP3222089B2 (en) * 1997-05-23 2001-10-22 大王製紙株式会社 Pants-type disposable diaper
JP2000014700A (en) * 1998-07-03 2000-01-18 Oji Paper Co Ltd Shorts type disposable diaper
JP4033590B2 (en) * 1999-09-21 2008-01-16 花王株式会社 Absorbent articles
JP3878367B2 (en) * 1999-09-22 2007-02-07 ダイオーペーパーコンバーティング株式会社 Pants-type disposable paper diapers
JP2001204762A (en) * 2000-01-28 2001-07-31 Crecia Corp Perfect shorts type paper diaper
JP3966661B2 (en) * 2000-01-31 2007-08-29 花王株式会社 Absorbent articles
JP3725049B2 (en) * 2001-07-05 2005-12-07 花王株式会社 Pants-type absorbent article
JP4139264B2 (en) * 2002-08-23 2008-08-27 花王株式会社 Pants-type absorbent article and manufacturing method thereof
JP4039219B2 (en) * 2002-11-21 2008-01-30 王子製紙株式会社 Pants-type diapers

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