JP2580834Y2 - Diapers - Google Patents

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 to be used as a diaper for infants or incontinent persons.

[0002]

2. Description of the Related Art There has been known a three-dimensional pants-type disposable diaper in which an absorbent pad structure comprising a top sheet, a barrier sheet, and an absorber placed between both sheets is mounted on a back sheet having elasticity and elasticity. (Table 1-503)
473).

[0003]

SUMMARY OF THE INVENTION The above-mentioned prior art absorbent pad structure comprising a top sheet, a barrier sheet, and an absorber placed between both sheets is mounted on a back sheet having elastic characteristics. In the diaper, since the elastic member is installed only in a plane at the leg opening,
Leak prevention and fit were not perfect.
In addition, it is difficult to attach an absorbent pad structure on a back sheet having stretch elastic characteristics so as not to restrict stretchability.

[0004] The present invention solves the above-mentioned drawbacks of the conventional pants-type diaper, improves the prevention of wetting at the leg openings of the pants and the fitting property, and makes the attachment of the absorbent pad structure to the back sheet firm and easy. It is intended to do so.

[0005]

According to the present invention, there is provided an absorbent pad structure having a liquid-permeable top sheet, a liquid-impermeable barrier sheet, and an absorber placed between the sheets. A waist opening, a leg opening, a crotch portion, a backsheet having a front body and a back body separated by sandwiching the crotch portion, and two side edges extending between the leg opening portion and the waist opening portion of the backsheet are mutually engaged. In three-dimensional pants-type disposable diapers consisting of side seams that are formed by bonding to
The absorbent pad structure has a flap in which both side edges of a barrier sheet extending outward in the same direction from both lateral side edges of the absorber are folded on the absorber, and a folded portion is provided with a stretchable elastic member, The back sheet is made of a non-stretchable elastic material, a stretchable elastic member is disposed at the waist opening and the leg opening, and both end portions and a leg opening of the stretchable elastic member disposed at the waist opening except the central portion. Having a structure in which a stretchable elastic member provided in the portion is covered with a side sheet, and the absorbent pad structure is provided on the back sheet over the entire length in the longitudinal direction of a central portion of the back sheet not covered with the side sheet. It is characterized by being fixed. As the side sheet in the three-dimensional pants-type disposable diaper having the above structure according to the present invention, a sheet capable of reinforcing a back sheet is used. In particular, it is preferable to use a sheet having elastic properties. Further, as the absorber, there may be used one having a plurality of laminated structures made of fluff pulp and a nonwoven fabric disposed between the layers.

[0006]

According to the disposable diaper of the present invention having the above structure, a flap formed by a barrier sheet provided on an absorbent pad structure rises to form a leak-proof wall, and in particular, a stretchable elastic member disposed at a leg opening. Has the function of preventing leakage from the leg openings in combination with the leakage prevention function. Also, the side sheet attached to the back sheet is a back sheet,
In particular, it suppresses the elongation of the back sheet composed of a sheet having the property of being easily stretched when a tensile force is applied, such as a hydroentangled nonwoven fabric, and functions to maintain the adhesiveness with the absorbent pad structure. Even if irreversible elongation occurs in the backsheet due to a stronger tensile force, the backsheet is in the original state due to the contraction force of the sidesheets having the elasticity due to the elastic sheet. The original fit and leakage prevention function are not impaired.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings showing embodiments of the present invention, but the present invention is not limited to these embodiments. 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 a leg opening 3, and a stretchable elastic member 5 (see FIG. 2) is attached to at least a part of the waist of the back sheet 4. The front seam 6 and the rear body 7 formed between the two openings have side seams 8 which are adhesively closed at both side edges.

The side seam 8 is closed with the front body 6 and the back body 7 overlapped via the crotch portion of the back sheet 4 so that the absorbent pad structure 9 is on the inside, and both side edges are projected outward. Then, the bonding is performed by joining both side edges with a hot melt adhesive, pressure melting, ultrasonic waves, or the like.
This joining may be performed in any state such as a state in which both side edges protrude inward, a state in which one side edge is directed outward, and the other side edge is directed inward.

FIG. 2 is an exploded perspective view of the absorbent pad structure 9 and the backsheet 4 in an extended state where the side seam of the three-dimensional pants-type disposable diaper 1 shown in FIG. , An absorbent pad structure 9, a waist elastic member 5 and a side sheet 16. FIG. 3 is a perspective view in which the side seam of the three-dimensional pants type disposable diaper 1 is opened and opened. FIG. 4 shows FIG.
5 is a sectional view taken along line AA 'of FIG. 5, and FIG. 5 is a perspective view of the waist portion of FIG.

As shown in FIGS. 2 to 5, the absorbent pad structure 9 has a liquid-permeable top sheet 10, a liquid-impermeable barrier sheet 11, and a smaller length between both sheets than the two sheets. A barrier sheet extending with a width of the absorber 12 interposed therebetween, and a barrier sheet portion extending to the side of the absorber 12 is folded back on the absorber to form a flap 13 and extends outward before and after the absorber. 11 and the folded flaps 13 are attached to each other, and one or more elastic members 14 are arranged along at least a part of the length direction of each free edge of the flaps 13 arranged in the longitudinal direction on the absorber upper surface. Is provided.

As shown in FIGS. 3 and 4, when the absorbent pad structure 9 having the above structure is left without restraining the elastic member 14, the elastic member 14 contracts freely and the elastic member is disposed. Each free edge of the flap 13 is separated from the absorber 12 to form an opening with gathers, and the barrier sheet 11 forms a pouch with the absorber 12.

As shown in FIG. 5, the waist elastic member 5 is disposed between the back sheet and the barrier sheets 11 at both ends in the longitudinal direction of the absorbent pad structure 9, and between the back sheet and the side sheets 16. . In addition, by disposing a plurality of elastic members 15 in the leg opening, a planar area having a large width can be fitted well around the leg, and leakage from the leg periphery can be minimized.

As shown in FIG. 2, the absorptive pad structure 9 is attached to the backsheet 4 by the length of the central portion of the backsheet 4 excluding the side edges covered by the side sheets 16 in the longitudinal direction and the absorptivity of the absorbent pad structure 9. Adhering to the entire length in the longitudinal direction of a part of the side sheet 16 overlapping with the base end portion 20 of the flap formed in the pad structure, for example, using a hot melt adhesive 22 or the like arranged continuously or discontinuously in a stripe shape Fixed. It is desirable that the width of the adhesive with the side sheet is 1 to 20 mm from the side edge of the center of the side sheet.

As the top sheet 10, polyethylene,
Liquid permeable non-woven fabrics made of polypropylene and other thermoplastic fibers are used. The elastic members 14, the elastic members 15 and the elastic members 5 disposed on the free edge of the flap are used in ordinary paper diapers such as urethane film, urethane thread, urethane foam, and thread rubber. The product can be used as it is. In addition, the elastic members are disposed at the free ends, the leg openings, and the waist portions of the flap 13 in the extended state, respectively, and are bonded and fixed by a hot melt adhesive.

The absorber 12 is preferably made of fluff pulp and a superabsorbent polymer in combination, and may be a single absorbent paper or a mixture or laminate of heat-fusible fibers. A layered structure in which fluff pulp is mixed in the upper layer 17 and fluff pulp and a superabsorbent polymer are mixed or layered in the lower layer 18, and a nonwoven fabric 19 is provided between the layers to prevent the absorber from losing its shape. The shape of the absorber 12 may be an hourglass type or a rectangular type, but the hourglass type provides better fit.

Examples of the barrier sheet 11 include a liquid-impermeable polyethylene sheet, a moisture-permeable liquid-impermeable sheet obtained by adding a filler to a thermoplastic resin, and a composite material in which a nonwoven fabric is bonded to a film to improve the touch. A sheet or the like is used. When laminating a non-woven fabric to a film for a barrier sheet, lamination is performed on the entire surface of the film,
The bonding may be partial such as both side edges, and may be lamination such that the side edge of the film and the side edge of the nonwoven fabric coincide, or may be lamination such that the nonwoven fabric exists outside the both side edges of the film.

As shown in FIG. 4, the flap is located inside the elastic member at the leg opening. A non-woven fabric 21 is provided on the outer side of both sides of the film
When a flap 13 having a stretchable elastic member 14 provided on a non-woven fabric portion extending outside the film is formed using a composite material bonded so that there is a rubber, a more comfortable and excellent air permeability can be obtained. .

As the side sheet 16 having elasticity and elasticity, an elastomer non-woven web alone is preferable, but at least one surface of the elastomer non-woven web is a polyester fiber such as polyethylene terephthalate fiber, a polyamide fiber such as polyolefin fiber or nylon fiber. Also, a web in which a fiber layer made of a material selected from a group including cellulose fiber such as cotton fiber, pulp fiber and a mixture thereof is hydroentangled or laminated can be used.

A web in which the fiber layer is hydroentangled or laminated on at least one surface of a polyurethane-based film, a natural rubber sheet or a foamed sheet having a thickness of 5 to 40 μm and having moisture permeability and elasticity. Alternatively, a laminate obtained by laminating a hydroentangled nonwoven fabric may be used.

The lamination may be partial, such as in the central region of the web, on one side edge, on both side edges. The method of laminating may be any of pressure fusion bonding by hot embossing, bonding by hot melt adhesive, ultrasonic bonding, and the like.

The side sheet 16 having stretch elasticity has a basis weight of 20 to 70 g / m ² , an elastic stress at 50% elongation of not more than 300 g / 25 mm width in both longitudinal and transverse directions, and a recovery rate of 80% at the time of stress relaxation. It is preferable that it is above.

As the non-stretchable elastic back sheet 4, a hydrophilic or water-repellent hydro-entangled nonwoven fabric is used. The nonwoven fabric is a web formed from a material selected from polyester fibers such as polyethylene terephthalate, polyolefin fibers, polyamide fibers, cellulose fibers such as cotton fibers, pulp fibers, and mixtures thereof by hydroentanglement or the like. These webs are stretched when a tensile force or the like is applied, but do not return to their original contractility even when released from the tensile force.

[0023]

[Effects of the Invention] As described above, according to the present invention, a diaper that can be worn comfortably by a wearer who has no leakage of excrement, has a good fit, has excellent moisture permeability, and has a good touch is inexpensive. Can be provided.

[Brief description of the 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 disposable diaper of FIG.

FIG. 3 is a perspective view of the three-dimensional pants-type disposable diaper of the present invention when the elastic member disposed on the flap is left unrestricted.

FIG. 4 shows the disposable diaper of the present invention shown in FIG.
Sectional drawing when cut | disconnected by the A 'line.

FIG. 5 is a perspective view of a waist portion of the disposable diaper of the present invention shown in FIG. 3;

[Description of References] 1: Three-dimensional pants type diaper, 2: Waist opening, 3: Leg opening, 4: Back seat, 5: Waist elastic member, 6: Front body, 7: Back body, 8: side seam, 9: absorbent pad structure, 10: top sheet, 1
1: barrier sheet, 12: absorber, 13: flap, 1
4: stretchable elastic member, 15: leg opening stretchable elastic member, 1
6: side sheet, 17: upper layer absorber, 18: lower layer absorber, 19: interlayer nonwoven fabric, 20: base end of flap, 2
1: Non-woven fabric bonded to side edge of barrier sheet, 22: Adhesive layer

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Mie Takahashi 1-10-6 Shinonome, Koto-ku, Tokyo Oji Paper Co., Ltd. Research Center (56) References JP-A-62-231004 (JP, A) (58) ) Surveyed field (Int.Cl. ⁶ , DB name) A61F 13/15 A61F 5/44

Claims (2)

(57) [Scope of request for utility model registration] 1. An absorbent pad structure having a liquid-permeable top sheet, a liquid-impermeable barrier sheet, and an absorber placed between the sheets, a waist opening, a leg opening, a crotch, and the crotch. It comprises a backsheet having a front body and a backbody disposed therebetween, and a side seam formed by mutually adhering two side edges formed between leg openings and waist openings of the backsheet. In the three-dimensional pants-type disposable diaper, the absorbent pad structure is configured such that a barrier sheet extending outward from both lateral edges of the absorbent body in the same direction is folded over the absorbent body, and a stretchable elastic member is provided at the folded portion. A flap is provided, the backsheet is made of a non-stretchable elastic material, a stretchable elastic member is disposed at a waist opening and a leg opening, and a central portion of the stretchable elastic member disposed at the waist opening is formed. except It has a structure in which the elastic members provided at both end portions and the leg openings are covered with side sheets, and the absorbent pad structure extends over the entire length in the longitudinal direction of a central portion of the back sheet that is not covered with the side sheets. A three-dimensional pants-type disposable diaper fixed to the back sheet. 2. The side sheet has a stretchable elastic characteristic, and an end of a bottom surface of the absorbent pad structure is fixed to a part of the side sheet over the entire length in the longitudinal direction. The three-dimensional pants type diaper described.