JP4464841B2 - Pants-type disposable diapers - Google Patents

Description

  The present invention relates to a pants-type disposable diaper having a disposal means formed in a paper diaper main body.

  Conventionally, underwear disposable diapers are marketed together with tape-type disposable paper diapers for the purpose of facilitating diaper separation or freeing adults from wearing work with fastening tape each time and simplifying wearing. Has been provided to.

  For example, as shown in FIG. 15, this pant-type paper diaper has elastic stretch members 51 and 52 disposed on the front and rear waist portions on a liquid-impermeable back sheet 50 made of polyethylene or the like. The first elastic elastic member 53 that continues from the front body F end of one leg around the lower part of the product paper diaper to the front body F end of the other leg, and the product paper diaper from the rear body B end of one leg A second elastic elastic member 54 that is continuous with the rear body B end of the other leg is disposed around the crotch part of the other leg, and an absorbent body 55 is disposed on the liquid-impermeable back sheet 50, and further thereon. A pants-type disposable diaper is formed by stacking a liquid-permeable top sheet 56, folding a previously formed hourglass shape in the front-rear direction, and joining the folded side edges by seal welding or ultrasonic welding. It is intended.

  At the time of disposal of such a pants-type disposable paper diaper, as shown in FIG. 16, the lower part of the elastic region member 57 at the center of the back body B and at the edge of the waist opening is shown in FIG. A disposable pants-type disposable paper diaper having a strip-like disposal fastening tape 59 fixed at one end along the vertical direction of the diaper and folded in a three-fold state on the surface of the liquid-impermeable back sheet 58 Proposed. In the disposal process, the diaper is rounded in the longitudinal direction from the crotch side, and the disposal fastening tape 59 is pulled and extended from the folded state, and is attached to the surface of the liquid-impermeable back sheet 58 and rolled up. Secure and discard. Thus, the following patent document 2, the following patent document 3, etc. can be mentioned as a pants-type disposable paper diaper which has a disposal tape in the back body.

Some paper diapers have also been proposed in which the paper diaper is fixed in a rolled state by means other than the disposal fastening tape. For example, in Patent Document 4 below, as shown in FIG. 17, a slit-like other opening or notch extending in the longitudinal direction of the pant body is formed between the widthwise edge of the front and rear waistline portion of the pant and the side seal. A pants-type disposable diaper having a perforation 60 that can be used has been proposed.
No. 8-10305 JP-T 8-507699 JP 2001-178777 A JP 2004-229815 A

  However, in the case of a method of fixing a rolled paper diaper using a disposal fastening tape as in Patent Documents 1 to 3, the lower portion of the elastic stretchable member 57 is fixed, that is, the back body B Since the disposal fastening tape 59 is fixed substantially in the center, there is a problem that it is difficult to grasp the disposal fastening tape 59 when the tip of the disposal fastening tape 59 is gripped and extended, and it has been used. When fixing the diaper in a rolled state, the adhesive strength may be reduced if the diaper is reattached several times, and the disposal fastening tape 59 that should have been fixed may be peeled off naturally. However, there were problems such as extra material costs and increased costs.

  Moreover, when the perforation 60 formed along the vertical direction in the side seal portion is used as the disposal means as in the above-mentioned Patent Document 4, the opening by the perforation 60 does not have elasticity, and is rounded. When fixing a diaper, it was very difficult to operate and there was a problem that the fixed state could not be held exactly.

  Therefore, the main problem of the present invention is to provide a pants-type disposable diaper that can be easily held in a rolled state by a disposal means formed on the diaper body, not a separate member such as a fastening tape for disposal. There is to do.

In order to solve the above-mentioned problems, as the present invention according to claim 1, in the product state, the front body and the back body are joined at the side portions, thereby forming a waist opening and a pair of left and right leg openings. In the pants-type disposable diaper having a plurality of elastic elastic members arranged along the horizontal direction with an interval in the vertical direction on the front body and the back body,
A piece of the back body is formed on the side or both sides of the back body along the elastic elastic member, and by forming a slit hole close to the elastic elastic member, the slit hole is formed by the action of the elastic elastic member. A pants-type disposable diaper characterized by having stretchability in the longitudinal direction is provided.

In the present invention according to claim 1 , the slit of the back of the diaper is formed on the side or both sides of the diaper, and the longitudinal direction of the hole is formed by the elastic elastic member disposed close to the slit hole. It is made to have elasticity. Therefore, when discarding the used paper diaper, after tearing off the seal welds on both sides of the diaper and removing it from the body, the paper diaper is folded in half and rounded from the crotch, and then the slit hole is formed. After the side is pulled to open the slit hole largely, the end of the rolled diaper can be fixed through the slit hole.

The slit is, since the pieces of the back body is is formed on the I side or both sides, because that will close to seal joints that join the front body and the back body, the ends of the slits Can be effectively prevented. Normally, pants-type disposable diapers have a curved shape with the back side bulging in the product state (two-fold flat state) so that the rear heel is loosened. The slit hole is preferably formed in the back body because it is rounded in a direction following the curve.

According to a second aspect of the present invention, there is provided the pants-type disposable diaper according to the first aspect, wherein the slit hole has a deformed rectangular shape in which the width of one side end corresponding to the diaper side is gradually enlarged. .

According to a third aspect of the present invention, there is provided the pants-type disposable diaper according to any one of the first and second aspects, wherein the slit hole has a longitudinal dimension of 100 to 200 mm.

According to a fourth aspect of the present invention, there is provided the pant-type disposable diaper according to any one of the first to third aspects, wherein a peripheral portion of the slit hole is reinforced by a heat seal. By reinforcing the periphery of the slit hole with a heat seal, it is possible to prevent tearing from the edge of the slit hole.

  As described in detail above, according to the present invention, after the diaper is rounded at the time of disposal, the slit hole is widened, and the rounded diaper is fixed so as to pass through the end, thereby easily holding the diaper in a rounded state can do.

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

<< First embodiment >>
FIG. 1 is a perspective view showing a product-like body of a pants-type disposable diaper 1A according to the first embodiment, and FIG. 2 is a partially broken development view.

  As shown in FIG. 1 and FIG. 2, this pant-type paper diaper 1 </ b> A includes an absorbent body 13 made of cotton-like pulp or the like by a liquid-permeable top sheet 11 made of a nonwoven fabric and a waterproof film 12 made of polyethylene or the like. Is a paper diaper having a structure in which an exterior sheet 20 is integrally provided on the outer surface side of the absorbent main body 10 having a structure including

  The absorbent body 13 has a substantially hourglass shape in the illustrated example, is surrounded by crepe paper, and has a semi-rigid property that can be deformed as a whole, and contains a powdery polymer absorbent polymer inside. Has been.

  The liquid-permeable top sheet 11 is fixed to the upper surface of the absorbent body 13 by a hot melt adhesive on almost the entire surface, and the waterproof film 12 is also fixed to the lower surface of the absorbent body 13 by the hot melt adhesive. The absorptive main body 10 is configured. Three-dimensional gathers B and B are provided on both sides of the surface of the absorbent main body 10 by gather sheets.

  An exterior sheet 20 is integrally provided on the outer surface side of the absorbent main body 10. As shown in FIG. 2, the exterior sheet 20 is a two-layer nonwoven fabric sheet composed of an upper nonwoven fabric 20A and a lower nonwoven fabric 20B, and various elastic stretch members are provided between the upper nonwoven fabric 20A and the lower 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.

  Specifically, in the developed shape shown in FIG. 1, the opening of the front body F and the opening of the back body B are made of, for example, rubber bands. , 24... Are provided.

  In the front body F, a plurality of waist elastic elastic members 25, 25... Made of, for example, rubber thread are provided along the horizontal direction in the illustrated example, and also in the back body B. In the illustrated example, five waist elastic elastic members 25, 25,... Made of, for example, rubber thread are provided along the horizontal direction.

  On the other hand, at the leg portion, one or a plurality of elastic members 30... 31 in the illustrated example are provided along the leg openings. Although various forms can be considered as arrangement modes of these leg-hole elastic members, the illustrated arrangement mode is an arrangement in which the leg-hole elastic members are arranged across the absorber 13 in the crotch portion. It is an aspect. Specifically, one or a plurality of three in the illustrated example, which are continuously arranged from the front end F end side of one leg around the crotch portion to the front end F end side of the other leg periphery. The first elastic elastic members 30, 30... Of the leg and one or a plurality of continuously arranged around the crotch part from the rear body B end side of one leg and the rear body B end of the other leg. In the illustrated example, it is composed of three leg elastic second elastic members 31, 31.

  The elastic elastic members 24, 25, 30, and 31 are made of commonly used materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, and polyester. Can be used.

  As shown in FIG. 2, the front diaper F and the rear body B are overlapped with each other at a folding line L at the center, and both side edges thereof are joined by a welding method such as heat sealing or ultrasonic welding. By doing so, it is formed into a pant mold in which a waist opening and a pair of left and right leg openings are formed in a product state.

  In contrast to such a pants-type disposable diaper 1A, in the present invention, as shown in FIGS. 1 and 2, the piece of the back body B is on the flank side and between the waist elastic elastic members 25, 25. A slit hole 27 that is long in the horizontal direction is formed. The slit hole 27 is formed so as to penetrate the exterior sheet 20 and is used for fixing a rounded state when the used diaper 2 is discarded.

  The slit hole 27 is formed along the direction of the waist elastic elastic members 25, 25, so that the elasticity of the waist elastic elastic members 25, 25 acts, so that the elasticity of the slit holes 27 extends along the longitudinal direction of the hole. Has been granted. That is, since the opening by the slit hole 27 can be enlarged and reduced, when fixing the diaper, the opening can be enlarged like rubber, and after fixing, the diaper is rounded by contraction force. The state can be maintained.

  The longitudinal dimension B of the slit hole 27 is 100 to 200 mm, preferably 100 to 150 mm. When the longitudinal dimension B is less than 100 mm, it is difficult to pass the end of the diaper rounded to disposal. When it exceeds 200 mm, the opening is too large, and there is a possibility that the rolled diaper cannot be held tightly by the contraction force. The slit hole 27 has a rectangular shape as shown in FIG. 8 (A), as shown in FIG. 8 (B), and the end of the rolled diaper is easily passed through the slit hole 27 as shown in FIG. 8 (B). Moreover, it can be set as the deformation | transformation rectangular shape which expanded the width | variety of the one side edge part (diaper side part side) gradually. Further, it is desirable to reinforce the periphery of the slit hole 27 by reinforcing it with a heat seal.

  To dispose of used diapers, tear off the seal welds on both sides of the diaper and remove it from the body. Then, as shown in FIGS. After being rounded from the side, as shown in FIG. 3 (C), the side of the diaper on which the slit hole 27 is formed is pulled to the side, and the slit hole 27 is greatly opened, and then FIG. ), The end of the rolled diaper is passed through the slit hole 27. Since the slit hole 27 has elasticity, the diaper is fixed while maintaining a curled state by its contraction force.

The slit hole 27 can be formed in a pair of left and right sides on the both sides of the back body B as shown in FIG.
In this case, as shown in FIG. 4B, the ends of the rolled diaper are respectively passed through the slit holes 27, 27 formed on both sides, and both ends are fixed respectively. .

  Further, the slit hole 27 may be formed substantially at the center of the back body B as shown in FIG. 5, or both side portions (not shown) of the front body F as shown in FIG. Each of them may be formed on only one side), or may be formed substantially at the center of the front body F as shown in FIG. Furthermore, it may be formed on both the front body F and the back body B. In this case, the slit hole 27 formed in the front body F and the slit hole 27 formed in the back body B may be the same shape or different shapes. When different slit holes 27 are used for the front body F and the back body B, one of the slit holes 27 is rectangular as shown in FIG. 8A, and the other slit hole 27 is deformed as shown in FIG. 8B. It can be rectangular.

  In the case where the slit hole 27 is formed in the vicinity of the side portion, the slit hole 27 is close to the seal joint edge between the front body F and the back body B, so that breakage from the end of the slit hole 27 is effectively prevented. become able to.

<< Second Embodiment >>
Next, an example in which the present invention is applied to the pant-type disposable diaper 1B having a different diaper structure will be described in detail with reference to FIGS.

  FIG. 9 is a product state external view of the pants-type disposable paper diaper 1 according to the second embodiment, and FIG. 10 is an assembled view in an unfolded state.

  As shown in FIGS. 9 and 10, the pants-type disposable paper diaper 1 </ b> B (hereinafter simply referred to as “paper diaper”) is provided between a liquid-permeable surface sheet 11 made of nonwoven fabric or the like 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 This is 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 the back F and the back body B 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. 11 and 12.

  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 planar shape that is substantially rectangular. 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. 12, 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 rolled 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 absorbed 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. 12 (B), the thread-like elastic elastic members 16, 16... For forming a three-dimensional gather BS by raising the nonwoven fabric portion protruding from the absorber side edge portion by elastic elastic force. Is.

  The leak-proof sheet 12 enters 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. Further, 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 FIG. 13, the exterior sheet 20 is a two-layer nonwoven fabric sheet composed of an upper nonwoven fabric 20A and a lower nonwoven fabric 20B, and various elastic elastic members are disposed between the upper nonwoven fabric 20A and the lower nonwoven fabric 20B. In addition, elasticity is given. 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. 13, waist elastic elastic members 24, 24... Arranged around the waist opening 23 and the front body F And 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 in each of the front body F and the back body B, In addition to the waist elastic elastic members 25, 25..., The front body F and the back body B extend from the one side joint edge joining the front body F and the back body B to the crotch side, cross the absorbent main body 10 on the crotch side, and the rear body. It is provided with a plurality of curved elastic elastic member groups 26, 28, etc., which reach the other side joining edge with the body and are arranged at intervals without crossing each other. In addition, in this exterior sheet | seat 20, the leg periphery elastic expansion-contraction member which was substantially continuous along the said leg periphery cut line 29 as shown in the 1st form example is not provided.

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

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

  The waist elastic elastic member groups 25, 25... Are arranged in the horizontal direction at intervals in the vertical direction over the range from the upper part to the lower part of the side joint edges 21, 22. 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. It should be noted that the boundary between the waist elastic elastic members 24, 24... And the waist elastic elastic members 25, 25. 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 parts extending to the crotch portion along the line 29 and arranged so as to reach the other side side joint edge 22 while crossing the absorbent main body 10 and substantially along the opposite leg circumference cut line 29. In the illustrated example, there are nine elastic rubber elastic elastic members, and the back-side curved elastic elastic member groups 26, 26... Are arranged at intervals without crossing each other.

  The back-side curved elastic elastic member groups 26, 26... Are different from the conventional leg-hole elastic elastic members (refer to the first embodiment) in arrangement. 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 inside 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.

  In addition, 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 rear body B, and the absorbent main body. 10 at the intersection with the side edge, the acute angle 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 They are arranged in an arrangement pattern of 45 ° or more. Incidentally, in the example of illustration, it arrange | positions so that the crossing angle (alpha) may be about 47 degrees. The crossing angle α is preferably 60 ° or less at most from the balance between the horizontal component force and the vertical component force.

  In the back diaper 1B, in the back body B, in order to fit the exterior sheet 20 corresponding to the bulge shape of the buttock, in order to apply a stretching force 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. It extends to the crotch part along the leg circumference cut line 29, crosses over the absorbent main body 10 and reaches the other side side joint edge 21 along the opposite leg circumference cut line 29 and intersects. A plurality of, in the illustrated example, nine thread-like elastic elastic members arranged at intervals without any gap.

  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.

  With respect to such a pants-type disposable diaper 1B, in the present invention, as shown in FIGS. 9 and 13, the piece of the back body B is the flank side, and the waist elastic elastic members 24, 24. A slit hole 27 that is long in the horizontal direction is formed between the elastic elastic member groups 25, 25. The operation effect and the disposal mode of the slit hole 27 are the same as those in the first embodiment. However, in this embodiment, as described above, the waist elastic elastic member 24, not between the waist elastic elastic members, 24 and the waist elastic elastic member groups 25, 25... Are formed with the slit holes 27. As described above, the elastic elastic member that gives the elastic force in the longitudinal direction of the slit hole 27 is either or both of the waist elastic elastic members 24, 24... And the waist elastic elastic members 25, 25. There may be. Depending on the case, it may be an elastic elastic member in a direction inclined with respect to the longitudinal line of the slit hole 27, such as the curved elastic elastic members 26 and 28.

  Also in the second embodiment, the slit holes 27 can be formed in left and right pairs on both sides of the back body B, or can be formed substantially in the center. Further, it may be formed on both sides of the front body F (only one side is acceptable), or it may be formed at substantially the center of the front body F. Further, as shown in FIG. 14, the leg elastic part is provided with curved elastic elastic members 28, 28... And can be formed along the curved elastic elastic members 28, 28.

  In the disposable diaper 1B according to the second embodiment, as shown in FIG. 14, in order to prevent the absorber 13 from being contracted, the ventral curved elastic elastic members 28, 28. The groups 26, 26... May be cut off on the absorbent main body 10 to be discontinuous.

It is a perspective view which shows the product-like body of 1 A of underpants type disposable diapers which concern on this 1st form example. FIG. It is a figure which shows disposal procedure (A)-(D). (A) is a figure which shows the other formation aspect of the slit hole 27, (B) is a figure which shows the discard state. It is a figure (the 1) which shows the formation aspect of the slit hole 27 others. It is FIG. (2) which shows other formation aspects of the slit hole 27. FIG. It is FIG. (3) which shows other formation aspects of the slit hole. FIG. 6 is a view showing an example of the shape of a slit hole 27. It is a product state external view of the underpants type disposable paper diaper 1B which concerns on this 2nd form example. 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. FIG. 6 is a development view showing a modified example of the exterior 20. It is an expanded view of the conventional underpants type disposable diaper. It is a paper diaper perspective view with which the conventional fastening tape for disposal was equipped. It is a principal part enlarged view which shows the example of the discard means formed in the conventional diaper main body.

  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 edge joint edge, 24 waist elastic elastic member, 25 waist elastic elastic member, 26 dorsal curved elastic elastic member, 27 slit hole, 28 ventral elastic elastic member, 29 ... leg leg cut line, F ... front body, B ... back body

Claims (4)

In the product state, the front body and the back body are joined at the sides to form a waist opening and a pair of left and right leg openings, and the front body and the back body are spaced apart vertically. In a pants-type disposable diaper having a plurality of elastic elastic members arranged along the horizontal direction,
A piece of the back body is formed on the side or both sides of the back body along the elastic elastic member, and by forming a slit hole close to the elastic elastic member, the slit hole is formed by the action of the elastic elastic member. A pants-type disposable diaper characterized by having elasticity in the longitudinal direction. 2. The pants-type disposable diaper according to claim 1, wherein the slit hole has a deformed rectangular shape in which a width of one side end corresponding to the diaper side is gradually enlarged . The slit holes, pants type disposable diaper according to claim 1 in which the longitudinal dimensions are 100 to 200 mm. The pants-type disposable diaper according to any one of claims 1 to 3, wherein a peripheral portion of the slit hole is reinforced by a heat seal.

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