JPH0838546A - Solid shorts type disposable diaper - Google Patents

Abstract

PURPOSE:To enable preventing of prints from being left along a leg part elastic body after the removal of a diaper by forming a slit keeping the leg part elastic body part kept from being joined on both side rim parts in the joining thereof. CONSTITUTION:In the bonded closure of a side joint part 8, a front panel is piled on a rear panel through a crotch part of a back sheet 4 with a absorbing pad texture 9 make inside and joined by a hot melt bonding or the like with both side rims thereof sticking outside. At this point, leg part elastic body parts 13 are not joined and a slit is formed with the parts as non-joint part 8', so that the circumference of legs is not tightened, leaving no print. When the non-joint part 8 is not less than about 30% of the overall length of both the side rims, fitness in the perimeter of the waist becomes worse and so it is preferable to set the part within about 10-25% of the overall length thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional pants type disposable diaper which is used as a diaper for infants or incontinent persons.

[0002]

2. Description of the Related Art A three-dimensional pants type disposable diaper has elastic members provided in the waist opening and leg openings to form gathers, so that it fits the wearer's body when worn and It also has the function of preventing leaks. In Japanese Patent Laid-Open No. 2-4364, an elastic side panel is joined to a side edge portion of an absorbent pad structure, and the side panel fits the wearer at the time of wearing.
Further, in Japanese Patent Publication No. 62-231005, a plurality of elastic bodies are curved along the circumference of the leg so as to fit the wearer.

[0003]

SUMMARY OF THE INVENTION A pair of elastic side panels are attached to the side edges of an absorbent pad structure composed of a top sheet, a barrier sheet and an absorbent body placed between the sheets. The diaper has elastic side panels directly attached to the side edges of the absorbent pad structure, so the absorbent pad structure is always restrained by the movement of the side panel, and the absorbent pad structure itself fits the body. Therefore, there is no freedom of movement required, and a gap is apt to occur between the absorbent pad structure and the body, especially in the crotch portion. Further, since the stretchable elastic member is installed only on the leg openings in a planar manner, the leak prevention and the fit are not perfect. Further, in the case of a disposable diaper in which a plurality of elastic bodies are curved along the circumference of the leg to improve the fitting property and prevent leakage, it is necessary to increase the gather strength of the elastic body. However, since this strongly tightens the circumference of the leg, there is a problem that a mark remains along the elastic body of the leg after taking off the diaper. An object of the present invention is to solve such a problem.

[0004]

SUMMARY OF THE INVENTION The present invention provides a liquid permeable topsheet, a liquid impermeable barrier sheet, and an absorbent pad structure having an absorbent body between the sheets, a waist opening,
Elastic bodies are provided in the leg openings, and the crotch part,
Three-dimensional pants in which a non-stretchable elastic back sheet having a front body and a back body arranged with the crotch portion sandwiched therebetween, and both side edges extending between a waist opening portion and a leg opening portion of the back sheet are joined to each other. The three-dimensional pants type disposable diaper is characterized in that the leg elastic bodies are not joined to each other to form a slit when the both side edges are joined together.

[0005]

The present invention will now be described in more detail with reference to the drawings showing examples of the present invention, but the present invention is not limited to these examples. FIG. 1 is a perspective view of a three-dimensional pants type disposable diaper 1 showing an embodiment of the present invention. The three-dimensional pants-type disposable diaper 1 shown in FIG. 1 has a waist opening 2 and leg openings 3, and an elastic elastic member 5 is attached to at least a part of the waist portion of the back sheet 4 so that at least a part of the leg openings. Attach the elastic member 13 to
The front body 6 and the rear body 7, which are formed so as to extend between the both openings, are formed of side joints 8 in which both side edges are adhesively closed.

Adhesive closure of the side joints 8 is accomplished by stacking the front body 6 and the back body 7 via the crotch portion of the back sheet 4 so that the absorbent pad structure 9 is on the inside, and projecting both side edges to the outside. In this state, a hot melt adhesive, pressure melting, ultrasonic waves, etc. are joined individually or in combination along the outermost portions of both side edges. It may be in any state such as a state in which both side edges are projected inward, a state in which one side edge is outside and the other side edge is inwardly abutted. At this time, the leg elastic bodies are not joined and the non-joint portion 8'forms a slit, so that the leg circumference is not tightened.

If the unbonded portion 8'is 30% or more of the total length of both side edges, the fit around the waist is inferior, so less than 30% of the total length of both side edges is preferable, and more preferably within 10 to 25%. Is preferred.

In another embodiment, after the leg elastic body is attached, in the manufacturing process of cutting around the leg elastic body, the elastic body hanging on the side edge is cut and the slit 17 is formed on the side edge portion. There is no strong tightening around the legs like.

As shown in FIG. 2, the three-dimensional pants type disposable diaper of the present invention basically comprises a non-stretchable elastic backsheet 4, a stretchable elastic sidesheet and an absorbent pad structure 9.

The absorbent pad structure 9 includes a liquid-permeable top sheet 10, a liquid-impermeable barrier sheet 11, and an absorbent body 12 having a length and a width smaller than those of the two sheets interposed between the sheets. There is. It is more preferable to provide elastic bodies on the flap free edges on both side edges in the longitudinal direction of the absorbent pad 9 to form a double gather.

Here, as the top sheet 10, a liquid-permeable nonwoven fabric made of polyethylene, polypropylene or other thermoplastic fibers is used. The stretchable elastic member 14, the leg opening stretchable elastic member 13 and the waist stretchable elastic member 5 arranged on the free edge of the flap are urethane films, urethane threads, urethane foam, thread rubber, etc. used in ordinary paper diapers. Can be used as is.

The absorbent body 12 is preferably made of fluff pulp as a main material in combination with a superabsorbent polymer, and other absorbent paper alone or a mixture or laminate of heat-fusible fibers is used. Further, the shape of the absorber 12 may be an hourglass shape or a rectangular shape, but the hourglass shape can obtain a better fit property.

The barrier sheet 11 is a liquid-impermeable polyethylene sheet, preferably a polyethylene sheet having micropores, a moisture-impermeable liquid-impermeable sheet obtained by adding a filler to a thermoplastic resin and stretching it. If such a breathable sheet is used, it is more comfortable without worrying about getting stuffy. The thickness of the barrier sheet is 20-40μ
It is preferably m.

Side sheet 14 having elastic elasticity
Is a non-woven elastomeric web, or a polyester fiber such as polyethylene terephthalate fiber, a polyolefin fiber, a polyamide fiber such as nylon fiber, a cellulose fiber such as cotton fiber, a pulp fiber and a mixture thereof on at least one side of the elastomer non-woven web. A web or the like in which hydro-entangled or laminated fiber layers made of a material selected from the group including is used. Again 5
A web or a hydroentangled non-woven fabric in which the fibrous layer is hydroentangled or laminated on the elastomer non-woven web on at least one side of a polyurethane-based film having a thickness of 40 μm and having elasticity and elasticity, a natural rubber sheet, or a foamed sheet. It may be a laminate of the above. The laminated lamination is in the central area of the web,
It may be partial such as one side edge. The method for laminating and laminating may be any of pressure fusion bonding by hot embossing, bonding with a hot melt adhesive, ultrasonic bonding and the like.

The side sheet 14 has a basis weight of 20 to 7
It is preferable that the elastic stress at 0% / m ² and 50% elongation is 300 g / 25 mm width or less in both longitudinal and transverse directions, and the recovery rate at stress relaxation is 80% or more.

The non-stretchable elastic back sheet 4 is made of a material including polyester fiber such as polyethylene terephthalate fiber, polyolefin fiber, polyamide fiber such as nylon fiber, cellulose fiber such as cotton fiber, pulp fiber and a mixture thereof. A hydrophilic or water repellent non-woven fabric obtained by hydroentangling selected fibers is used. These non-woven fabrics stretch when a tensile force is applied, but when they are released from the tensile force, they do not have a contracting force to return to their original state.

The absorbent pad structure 9 is attached to the backsheet 4 by a continuous or intermittent linear adhesive region 15 provided over the entire length of the central region of the backsheet 4 in the longitudinal direction.
Also, the barrier sheet 11 at the longitudinal end of the back surface of the absorbent pad structure and the adhesive region 16 provided at the waist portion of the back sheet 4 overlapping with the absorbent pad structure are bonded and fixed using a hot melt adhesive.

[0018]

As described above, according to the present invention, since the side sheet has elasticity, the diaper fits well, and since the legs are curved along the legs, there is no leakage of excrement. Since the elastic body portions around the legs on both sides have slits, no traces of the elastic body are left around the legs, so that it is possible to provide a diaper that can be comfortably worn by the wearer.

[Brief description of drawings]

FIG. 1 is a perspective view of a three-dimensional pants type disposable diaper of the present invention.

FIG. 2 is an exploded perspective view of an absorbent pad structure and a back sheet of the three-dimensional pants type diaper shown in FIG.

FIG. 3 is a perspective view showing a state in which a slit is formed in a side seam portion of the three-dimensional pants type diaper shown in FIG.

FIG. 4 is a development view of a three-dimensional pants-type diaper showing another embodiment different from FIG.

[Explanation of symbols]

1: Three-dimensional pants-type disposable diaper 2: Waist opening 3: Leg opening 4: Back sheet 5: Waist opening elastic elastic member 6: Front body 7: Back body 8: Side joint 8 ': Side part Non-joint part 9: Absorbent pad structure 10: Top sheet 11: Barrier sheet 12: Absorber 13: Leg opening elastic member 14: Side sheet 15: Linear adhesive region in the longitudinal central region of the absorbent pad structure 16 : Adhesive areas at both ends in the longitudinal direction of the absorbent pad structure 17: Side cuts

Claims (1)

[Claims] 1. A liquid-permeable top sheet, a liquid-impermeable barrier sheet, and an absorbent pad structure having an absorbent body between the two sheets are placed, and elastic members are provided in the waist opening and leg openings, respectively. Further, a crotch portion, a non-stretchable elastic back sheet having a front body and a back body arranged with the crotch portion interposed therebetween,
In a three-dimensional pants-type disposable diaper in which both side edges extending between the waist opening and leg openings of the backsheet are joined to each other, the leg elastic body section is used when joining the both side edges. A three-dimensional pants-type disposable diaper characterized by forming slits without being joined.