JPS63235501A - Disposable diaper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the invention [Field of industrial application] The present invention relates to a disposable diaper for absorbing and catching body excrement, and more specifically, to a disposable diaper with an elastic band attached. A specific portion of the flexible side flap is erected upward by the contraction of the elastic band. The present invention also relates to a disposable diaper that has a pocket on the opposite side and is worn by infants, the sick, the elderly, and incontinent people.

Conventionally, in absorbent articles such as disposable diapers, in order to improve the adhesion of the side flaps to the wearer's legs and prevent the leakage of excrement from the legs, the side flaps have been designed to stand upward. For example, what you configured is
Disclosed in US Pat. No. 4,579,556. According to this U, S, patented technology, the absorbent core (layer) interposed between the top sheet and the back sheet is formed into a rectangular shape, and the side flaps are attached to the outer edge of the elastic band. It is made to stand up along the outer edge of the absorbent core. The reason why the side flaps stand up in this way is that the rigidity of the absorbent core is stronger than that of the side flaps, and the contraction effect of the elastic band transmitted to the side flaps is blocked by the outer edge of the absorbent core, causing the side flaps to stand up. This is thought to be because it is converted into an erecting action on the side flaps. However, according to this philosophy, the absorbent core is constrained to have a substantially straight outer edge, generally rectangular in shape, and its width is limited. These limitations make it inappropriate to form the diaper into other shapes, such as an hourglass shape, in order to achieve better conformation to the body. Furthermore, even though the side flaps are erected as mentioned above, the erected side flaps are simply bent and along the outer edge of the absorbent core.
The height *) of the side flap is formed relatively large,
Unless the distance between the outer edge of the absorbent core and the stretchable gear portion created by the elastic band attached to its free end is relatively large, the side flaps will be strained due to the stiffness of the absorbent core. At the same time, the absorbent core tends to be irregularly deformed due to the stress strain caused by the contraction of the elastic band, resulting in poor appearance of the diaper when worn. ,
Not only does this cause discomfort to the wearer, but it also does not provide sufficient sealing between the diaper and the wearer's body, especially around the legs.

On the other hand, as a representative technique disclosing a means to overcome the problem of combining side flaps made of elastic gears with a semi-rigid absorbent core by elastic bands,
U.S. Patent No. 3,860,003 may be mentioned. The technology of this U.S. patent is that when an elastic band is placed on the outside sufficiently away from the outer edge of the absorbent core, the elastic band will cause the side flaps to contract and flex due to the stiffness of the absorbent core. The present invention teaches that an effective seal can be formed around the undercarriage without being inhibited. However, if you try to place the elastic band on the outside relatively far from the outer edge of the absorbent core, the overall width of the diaper is limited.
The width of the absorbent core, at least in the crotch area, has to be made relatively narrow1, which reduces the absorption capacity of the most important area for absorbing and receiving excrement, and prevents the absorption of excrement from around the legs. This can cause leakage. Also, U
, S., Patent No. 3,860°003 is also intended to eliminate the drawback of the prior art in which the front part of the diaper bulges like a dump apron and becomes like a bag, but the outer edge of the absorbent core and the elastic band are If the distance between is made relatively large,
Rather, they are unable to achieve their intentions.

On the other hand, there is a disposable diaper in which the side flaps are folded inward, the vertically opposing ends of the folded portions are fixed, an elastic band is attached to the free end of the side flaps, and a pocket for receiving excrement is formed on the opposite side. It is disclosed in JP-A-59-25741 and JP-A-61-244347. These diapers also stand up through the folded base ends of the side flaps, and U, S, Patent Nos. 3 and 8
Similar to No. 60,003, it is recognized that the stiffness of the absorbent core allows for an effective seal to be formed around the leg without impairing the elastic bands' ability to contract and flex the side flaps. However, in these diapers, the side flaps are folded back to the upper surface of the top sheet located on the upper surface of the absorbent core to fix their longitudinally opposing ends, so when worn, the upper surface of the side flaps,
When the side flap is unfolded to the opposite side, its lower surface comes into contact with the skin and is pressed against the top sheet by the absorbent core, so that the pocket on the opposite side opens sufficiently to prevent excrement from entering inside. may not be fully introduced.

The prior art does not teach a means of overcoming the above-mentioned problems through the special configuration of the side flaps, which will be described below with respect to the present invention.

The main purpose of the present invention is to effectively solve the problems of the prior art described above, to create an effective seal around one leg that cannot be expected from the prior art, and to minimize leakage of excrement from around the leg. The object of the present invention is to provide an improved disposable diaper that can

Other objects and benefits of the invention will become apparent from the following description.

(Z) Structure of the Invention [Means for Solving Problems] The present invention provides a water-permeable top sheet, a water-impermeable back sheet, a semi-rigid absorbent core interposed between the two sheets, and a water-permeable top sheet. a water-impermeable side flap having high flexibility and located on the horizontally opposite side of the absorbent core; and an elastic band forming elastic gears in the longitudinal direction of the side flap;
a tape fastener on laterally opposite sides of a dorsal region of the diaper, the side flaps comprising a first flap located on the outside of the absorbent core;
The second flap is folded outward between the side edges of the second flap located on the upper surface of the first flap and is intermittently joined to the first flap in the longitudinal direction along the folding line, and the vertically opposing ends of the folded part are an opening that is joined to the non-folded portion of the second flap, stands upwardly on the folded line due to the contraction of the elastic band, and is partitioned from the first flap by the intermittent joint; By providing the diaper as described above, characterized in that a pocket having a pocket is formed therein.

The purpose of this invention is to solve the above problems.

〔Example〕

Referring to FIGS. 1 to 4, the diaper.

Water-permeable top sheet 11 and water-impermeable back sheet 12
, a semi-rigid absorbent core 13 , and side flaps 14 . The side flap 14 is the first flap 1
6 and a second flap 17. The first flap 16 is made up of portions of the top sheet 11 and the back sheet 12 that extend outward from the lateral opposite side edges of the core 13. The second flap 17 overlaps the upper surface of the first flap 16 and their overlapping outer edges 18 are closely joined together such that a pocket 19 is formed between them. Furthermore, the second flap 17 is folded back to the outside at a midpoint between the outer edge 18 and the pocket 19, and the longitudinally opposing ends 24, 25 of this folded portion 20 are joined and fixed at the front section 21 and the back section 22. ing. Anterodorsal area 21.
An elastic band 26 is attached to the free end of the folded part 20 located in the crotch area 23 between the folded parts 22 and 22, extending in the length direction thereof, and is covered in a bag-like manner by the edge 27 of the folded part 20. . A recessed notch is formed on the outside of the side flap 14 in the crotch area 23.

As shown in FIG. 3, the second flap 17 is folded back
A28 at a predetermined interval in the longitudinal direction along this, preferably 5
They are joined to the first flap 16 in a dotted manner at intervals of ~50 m, more preferably 10 to 30 m, and most preferably 15 to 20 m, and numeral 29 indicates the joining point. As shown in the figure, the said joint is the second flap 17
It may be a continuous line or an interrupted line extending laterally,
Reference numeral 30 indicates the joining line.

As shown in FIG. 5, the opening edge of the pocket 19 is thus partitioned in the vertical direction to form individual openings 19a.

A tape fastener 31 coated with a pressure-sensitive adhesive is attached to the side flap 14 in the dorsal region 22,
When worn, the diaper is assembled by gluing the free end of the zipper to the front surface, as shown in FIG.

The top sheet 11 is made of a fibrous non-woven fabric, a porous plastic film, etc., and the back sheet 12 is made of a plastic film, a laminate sheet of the film and a fibrous non-woven fabric, or the like. In the case of the laminate sheet, the nonwoven fabric is used on the outer surface. Further, the plastic film used as the backsheet 12 is preferably breathable and waterproof, but may be non-breathable if a means for ventilating the inside and outside of the diaper is provided. The core 13 is a mat-like body in which flap pulp and superabsorbent polymer particles are mixed or not mixed, and at least the upper and lower surfaces thereof are covered with a water-permeable sheet such as tissue vapor or a hydrophobic net. Because it is made from such a material and has a shape, it is semi-rigid. Of course, the core 13 is the top sheet 1
1 and the back sheet 12 using, for example, a hot melt adhesive (not shown). The elastic band 26 may also be made of thread-like or tape-like rubber, tape-like plastic foam, plastic film that shows elasticity when heat treated, or the like. These diaper materials are those that have been commonly used in disposable diapers, and therefore it will be extremely easy for those skilled in the art to appropriately select them as necessary.

As described above, the first flap 16 is formed of each portion of the top sheet 11 and the back sheet 12 extending outward from the lateral opposite side edges of the core 13, and a portion of the second flap 17. The second flap 17 is formed of a breathable and waterproof sheet, and its material is preferably a fibrous nonwoven fabric treated to be water repellent with, for example, silicone resin.

However, in the present invention, the second flap 17 also includes the top sheet 11 and the back sheet 1 like the first flap 16.
2 may be formed by folding back a portion.

Outer edge 18 between first flap 16 and second flap 17, junction 29. It goes without saying that the bonding such as the bonding line 30 can be achieved by adhesive or welding means.

A wide topsheet 11 and a wide backsheet 12 may be used to form the side flaps 14 and the outer portions of these or the backsheet 12 may be folded back. However, if the top sheet 11 and the back sheet 12 are separate sheets made of different materials, there is an advantage that cannot be obtained when the side flaps 14 are formed from the extended portions of the top sheet 11 and the back sheet 12. For example, even when a breathable and waterproof material is used as the backsheet 12, the side flaps 14 can be formed of a highly breathable and waterproof material to reduce stuffiness inside the diaper. Also, even if its highly breathable and waterproof materials are relatively costly.

Since the side flaps 14, especially the second flaps 17, need only be narrower than the backsheet 12, this is not economically disadvantageous.

[Effect]

As shown in FIGS. 3 to 5, the elastic band 26
gives elasticity to the second flap 17 to create gears. The contractile force of the elastic band 26 acts substantially on the entire second flap 17 on which the elastic band is located, but since it is intermittently joined at the fold line 28 of the second flap 17, the elastic band 26 first acts on the bending force. The contractile force is attenuated or suppressed on the fold line 28 , so that a significant amount of the contraction force is converted into an upwardly erecting action from the first flap 16 on the fold line 28 .

The folded portion 20 of the second flap 17 is made to stand up independently regardless of the outer edge of the core 13, and the opening 19a of the pocket 19 is opened by the contraction force. A slight contraction force of the elastic band 26 beyond the folding line 28 is applied to the first flap 16 via the joining point 29 and the joining line 30.
, and does not act on the core 13 to adversely affect it.

The folded portion 20 of the second flap 17 is formed vertically of the second flap 17 with the free end where the elastic band 26 is located facing outward and resisting the inclination tendency inward due to the shrinking action of the elastic band 26. Opposing end 24.
25 is fixed, the second flap 17 always has the required tension and always maintains an upwardly erect state. Further, the folded portion 20 of the second flap 17 follows the movement of one leg, and can tilt or tilt at any angle while maintaining elastic pressure contact with the skin using the folding line 28 and the vertically opposing ends 24 and 25 as fulcrums. Lay down.

Incidentally, in order to improve the elasticity of the second flap 17, the height of the second flap 17 should be at least LO nm,
Preferably it is 15-50 rm. The distance between the outer edge of the core 13 and the folding line 28 is not particularly limited, but is preferably 50 m or less. As long as the second flap 17 has the required height, the opening 19a of the pocket 19 is formed, and the fold line 28 is provided, the second flap 17 may be attached to the outer edge of the core 13. It may be close to.

(3) Effects of the Invention Since the present invention has the above-described structure and operation, even if the outer edge of the absorbent body and the position of the elastic band attached to the side flap are not far apart, the elastic band can be removed due to the rigidity of the core. The contractibility and flexibility of the side flaps are not inhibited by the band, and at the same time, due to the contractile force of the elastic band, the core is subject to significant stress distortion, causing discomfort to the wearer and causing leakage of excrement. No regular or unnatural deformations. Further, the pocket formed between the first flap and the second flap constituting the side flap has openings that are intermittently joined in the longitudinal direction, and each of these openings is connected to the elastic band. Since it opens with contraction force, excrement can easily flow in and be received.

Therefore, according to the present invention, it is possible to form an excellent seal against the shoulder opening and minimize leakage of excrement, which cannot be expected from diapers according to the prior art. You can also change the width of the side flaps, so
The side flaps do not bulge out like a dump apron, causing an unsightly appearance, and do not impede the wearer's exercise.

[Brief explanation of drawings]

The drawings show an embodiment of the diaper of the present invention; FIG. 1 is an assembled perspective view of the diaper, FIG. 2 is an exploded perspective view of the diaper,
3 and 4 are partial perspective views of the side portion of the diaper, and FIG. 5 is a partial perspective view of the side portion of the diaper seen from the inside. 11...Top sheet 12...Back sheet 1
3...Core 14...Side flap 1
6...First flap 17...Second flap 18
...Outer edge 19...Pocket 19a...
・Opening part 20...Folded part 24.25...
・Vertical opposing end 26...Elastic band 28...
・Folding line 29...Joining point 30...Joining line ↑, ・-,: Figure 3

Claims (4)

[Claims] (1) A water-permeable top sheet, a water-impermeable back sheet, a semi-rigid absorbent core interposed between the two sheets, and a highly flexible absorbent core located laterally opposite the absorbent core. A disposable diaper comprising water-permeable side flaps, an elastic band forming elastic gathers in the longitudinal direction of the side flaps, and a tape fastener on laterally opposite sides of a dorsal region of the diaper, the side flaps comprising:
It consists of a first flap located on the outside of the absorbent core and a second flap located on the upper surface of the first flap, and the second flap has the elastic band on the inner edge and the outer edge The folded portion is joined to the first flap, is folded outward between the inner and outer edges, and is intermittently joined to the first flap in the longitudinal direction along the folding line, and the longitudinally opposing end of the folded portion is connected to the second flap. It is joined to the non-folded portion of the flap, and therefore stands upwardly on the folding line due to the contraction of the elastic band, and has an opening partitioned off from the first flap by the intermittent joining. The diaper characterized in that a pocket is formed. (2) The disposable diaper according to claim 1, wherein the intermittent joining extends outward from the folding line continuously or intermittently. (3) The disposable diaper according to claim 1, wherein the second flap is formed of a separate breathable and waterproof sheet made of a different material from the first flap. (4) The first flap and the second flap are formed by respective parts of the top sheet and the back sheet that extend outward from the outer edge of the absorbent core. Disposable diapers as described.