JPH0724673B2 - Disposable diapers - Google Patents

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 receiving body excrement, and more specifically, an elastic band is attached to the disposable diaper. The present invention relates to a disposable diaper worn by an infant, a sick person, an elderly person, or an incontinent person, in which a specific portion of a flexible side flap is erected upward by a contracting action of the elastic band and has pockets on the opposite side.

Conventionally, in absorbent articles such as disposable diapers, in order to improve the adhesion of the side flaps around the legs of the wearer and prevent the leakage of excrement from around the legs, the side flaps stand upright. What you have configured is, for example,
It is disclosed in US Pat. No. 4,579,556. According to the technique of this US patent, the absorbent core (layer) interposed between the top sheet and the back sheet is formed in a rectangular shape, and the side flap is attached to the outer edge of the elastic band by the contracting action of the elastic band. It is intended to stand along the outer edge of the core. Since the rigidity of the absorbent core is stronger than that of the side flap, the side flaps are erected in this manner, so that the contracting action of the elastic band transmitted to the siflap is blocked at the outer edge of the absorbent core. It is considered that this is because it is converted to the standing action on the side flaps. But according to these ideas,
The absorbent core is constrained to have a shape in which its outer edges are substantially straight, generally rectangular, and also constrained by the width of the absorbent core. It is unsuitable to form another shape, for example, an hourglass shape, etc., in order to achieve a conforming close contact property with respect to. Further, even if the side flaps are erected as described above, the erection is simply performed by bending the side flaps along the outer edge of the absorbent core, so that the height (width) of the side flaps is increased. If the distance between the elastic gather made by an elastic band attached to the free end of the absorbent core and the outer edge of the absorbent core is relatively large, the side flaps have a rigidity of the absorbent core. Due to the stress strain, the flexible core is apt to be impeded from free flexibility, and at the same time, the absorbent core is likely to be deformed irregularly due to the stress strain due to the contraction action of the elastic band, resulting in the appearance of wearing the diaper. In addition to making the wearer uncomfortable and giving discomfort to the wearer, the adhesion between the diaper and the wearer's body, especially the sealability around the legs cannot be obtained sufficiently.

On the other hand, as a representative technique to disclose the means for overcoming the problem of coupling the side flap, which is made of elastic gathers by the elastic band, with the semi-rigid absorbent core, U.
S. Patent No. 3,860,003 can be mentioned. This US
The patented technique is to place an elastic band on the outside well away from the outer edge of the absorbent core without hindering the shrinkability and flexibility of the side flaps due to the elasticity of the absorbent core. Teach that an effective seal can be made around the legs. However, attempting to place the elastic band on the outside relatively far away from the outer edge of the absorbent core limits the overall width of the diaper, thus creating a relatively narrow absorbent core width, at least in the crotch region. Inevitably,
Then, the absorption capacity of the most important area for absorbing and receiving excrement decreases, which causes leakage of excrement from around the legs. Also, US Pat.No. 3,860,003
It is also intended to eliminate the disadvantages of the prior art in which the front part of the diaper is inflated like a dump apron, but a relatively large distance between the outer edge of the absorbent core and the elastic band would rather You cannot achieve your intentions.

On the other hand, the side flap is folded back inward, the longitudinally opposed ends of the folded portion are fixed, an elastic band is attached to the free end of the side flap, and a disposable diaper in which 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 back ends of the side flaps, and like US Pat. No. 3,860,003, the elastic bands due to the rigidity of the absorbent core hinder the contraction and flexibility of the side flaps. Without
It is recognized that an effective seal can be made around the legs. However, in these diapers, since 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 the longitudinally opposite ends thereof, the upper surfaces of the side flaps and the side flaps when worn are worn. When it is deployed to the opposite side, its lower surface comes into contact with the skin and is pressed against the topsheet by the absorbent core, so that the pocket on the opposite side is sufficiently opened and the excrement is sufficiently guided therein. I may not be able to enter.

The prior art does not teach means for overcoming the above mentioned problems due to the special construction of the side flaps which will be described later with respect to the present invention.

The main object of the present invention is to effectively solve the above-mentioned problems of the prior art, to form an effective seal around the leg, which cannot be expected in the prior art, and minimize the leakage of excrement from around the leg. It is to provide an improved disposable diaper that can.

Other objects and advantages of the present invention will be clarified by the following description.

(2) Configuration of the Invention [Means for Solving Problems] The present invention relates to a water-permeable top sheet, a water-impermeable back sheet, an absorbent core interposed between the both sheets, and having semi-rigidity, and An impermeable side flap having high flexibility and located on the side opposite to the absorbent core, and an elastic band for forming elastic gathers in the longitudinal direction of the side flap,
A disposable diaper comprising: a tape fastener having laterally opposite sides of a dorsal area of the diaper, wherein the side flaps are first flaps located outside the absorbent core;
A second flap located on an upper surface of the first flap, the second flap having the elastic band on an inner edge thereof, and an outer edge thereof being joined to the first flap;
It is folded back 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 opposed ends of the folded portion are joined to the non-folded portion of the second flap. Therefore, a pocket is formed on the folding line, which is erected upward by the contracting action of the elastic band and which has an opening partitioned by the intermittent joining with the first flap. The problem is solved by providing the diaper characterized by the following.

〔Example〕

Referring to FIGS. 1 to 4, the diaper has a water-permeable top sheet 11, a water-impermeable back sheet 12, a semi-rigid absorbent core 13, and side flaps 14.
The side flap 14 comprises a first flap 16 and a second flap 17. The first flap 16 is composed of the topsheet 11 and the backsheet 12 that extend outward from the laterally opposite side edges of the core 13. The second flap 17 overlies the upper surface of the first flap 16 and these overlapping outer edges 18 are tightly joined together such that a pocket 19 is formed therebetween.
Further, the second flap 17 is folded back outward in the middle of the outer edge 18 and the pocket 19, and the longitudinally opposed ends 24, 25 of the folded back portion 20 are the front section 21 and the back section 22.
It is joined and fixed at. An elastic band 26 is attached to the free end of the folded-back portion 20 located in the crotch region 23 between the anterior-dorsal regions 21 and 22 so as to extend in the lengthwise direction thereof, and a bag is formed at the edge 27 of the folded-back portion 20. It is covered in a shape. A recess is formed on the outside of the side flap 14 in the crotch region 23.

As shown in FIG. 3, the folding line 28 of the second flap 17
Along this, at a predetermined interval in the vertical direction, preferably 5 to 50 m
m, more preferably 10-30 mm, most preferably 15-20 m
It is joined to the first flap 16 in a dot shape at intervals of m, and the reference numeral 29 indicates the joining point. Further, as shown in FIG. 4, the joint may be a continuous line or a discontinuous line extending in the lateral direction of the second flap 17, and reference numeral 30 denotes the joint line. As shown in FIG. 5, thus, the opening edges of the pockets 19 are 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 flaps 14 in the dorsal area 22, and the diaper, when worn, has its free end adhered to the front surface as shown in FIG. Assembled by

A fiber nonwoven fabric, a porous plastic film or the like is used for the top sheet 11, a plastic film, a laminated sheet of the film and the fiber nonwoven fabric, or the like is used for the back sheet 12. In the case of the laminate sheet, the non-woven fabric is used so as to be located on the outer surface. Also, the back sheet 12
It is preferable that the plastic film as mentioned above has a breathable waterproof property, but if it is provided with a means for ventilating the inside and outside of the diaper, it may not have a breathable property. As the core 13, a fluff pulp in which particles of a superabsorbent polymer are mixed or not mixed, at least the upper and lower surfaces of a mat-like body coated with a water-permeable sheet such as tissue paper and a hydrophobic net are used, and, It is semi-rigid due to its morphology made from such materials. Of course, the core 13 has, for example, a hot-melt adhesive (not shown) on the top sheet 11 and the back sheet 12.
It is fixed and fixed relatively immovably. Elastic band 26
Also, a thread-shaped or tape-shaped rubber, a tape-shaped plastic foam, a plastic film which is stretchable by heat treatment, or the like is used. Since these diaper materials have been conventionally used for disposable diapers, it will be extremely easy for a person skilled in the art to appropriately select them as necessary.

As described above, the first flap 16 includes the top sheet 11 and the back sheet 12 extending outward from the laterally opposite side edges of the core 13.
Of the second flap 17 and a part of the second flap 17. The second flap 17 is formed of a breathable waterproof sheet,
As the material, a fibrous non-woven fabric, which is water-repellent treated with, for example, silicone resin, is preferably used. However, in the present invention, the second flap 17 may also be formed by folding back a part of the topsheet 11 and the backsheet 12 like the first flap 16.

Outer edge between the first flap 16 and the second flap 17
It goes without saying that the joints such as 18, the joint points 29, and the joint lines 30 can be made by an adhesive or a welding means.

Wide topsheet for forming side flaps 14
11 and the backsheet 12 may be used to fold these or the outer portion of the backsheet 12. However, the use of separate sheets of different materials for the topsheet 11 and the backsheet 12 has an advantage that cannot be obtained when the side flaps 14 are formed at the extending portions of the topsheet 11 and the backsheet 12. For example, even when a breathable waterproof material is used as the back sheet 12, the side flaps 14 can be made of a highly breathable waterproof material to reduce stuffiness inside the diaper. Also, even though the highly breathable waterproof material is relatively expensive, side flaps 14, especially the second flap
Since the flap 17 may be narrower than the back sheet 12, it is not economically disadvantageous.

[Work]

As shown in FIGS. 3-5, the elastic band 26 imparts elasticity to the second flap 17 to create a gather. The contracting force of the elastic band 26 acts substantially on the entire second flap 17 on which it lies, but the second flap 17
Since it is intermittently joined at the fold line 28 of,
Attenuated or suppressed on the bending line 28 so that a considerable part of the contracting force is converted to an upward standing action on the folding line 28 from the first flap 16 and the second direction.
The folded portion 20 of the flap 17 is erected independently of the outer edge of the core 13, and the shrinkage force causes the pocket
The opening 19a of 19 opens. The slight contracting force of the elastic band 26 beyond the folding line 28 is only transmitted to the first flap 16 via the joint point 29 and the joint line 30, and the core
13 does not act in any negative way.

The folding part 20 of the second flap 17 is an elastic band.
Since the free ends where the 26 are located are directed to the outside, and the longitudinally opposed ends 24 and 25 of the second flap 17 are fixed in a state of resisting the inclination tendency toward the inside due to the contracting action of the elastic band 26, A required tension is always generated in the second flap 17, and the second flap 17 always keeps an upright state.
Therefore, the folded-back portion 20 of the second flap 17 follows the leg movement and tilts at a free angle while maintaining elastic pressure contact with the skin with the folded-back line 28 and the longitudinally opposed ends 24, 25 as fulcrums. Lie down.

By the way, in order to improve the elasticity of the second flap 17, the height of the second flap 17 is at least 10 mm, preferably
15 to 50 mm. The distance between the outer line of the core 13 and the folding line 28 is not particularly limited, but is preferably 50 mm or less. The second flap 17 has the required height and has a pocket 19
As long as the opening 19a of the second flap 17 is formed and the folding line 28 is provided, the second flap 17 may be the core in some cases.
It may be adjacent to the outer edge of 13.

(3) Effects of the Invention Since the present invention has the above-described configuration and operation, even if the outer edge of the absorber and the position of the elastic band attached to the side flap are not so far apart from each other, the elasticity of the elastic band causes the core to be elastic. The shrinkability and flexibility of the side flaps by the band are not impaired, and at the same time, the elastic band shrinkage force causes the core to be significantly stressed, which causes discomfort to the wearer and leads to leakage of excrement. No rules or unnatural transformations. In addition, the pocket formed between the first flap and the second flap that constitutes the side flap has openings that are intermittently joined to each other in the longitudinal direction, and each of these openings forms an elastic band. Since it is opened by the contracting force, excrement easily flows in and is received.

Therefore, according to the present invention, it is possible to minimize the leakage of excrement by providing an excellent seal around the legs, which cannot be expected in the conventional diapers. Also, the width of the side flaps can be narrowed,
The side flap bulges like a dump apron to deteriorate the appearance, and also does not hinder the wearer's exercise.

[Brief description of drawings]

The drawings show an embodiment of the diaper of the present invention. FIG. 1 is an assembled perspective view of the diaper, and 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 13 …… Core, 14 …… Side flap 16 …… First flap, 17 …… Second flap 18 …… Outside edge, 19 …… Pocket 19a …… Opening, 20 …… Folded part 24,25 …… Vertical opposite end, 26 …… Elastic band 28 …… Folded line, 29 …… Joint point 30 …… Join line

Claims (4)

[Claims] 1. A water-permeable top sheet, a water-impermeable back sheet, an absorbent core having semi-rigidity interposed between the two sheets, and a laterally-opposite side of the absorbent core and having high flexibility. A disposable diaper comprising a water-impermeable side flap having, an elastic band that creates elastic gathers in the longitudinal direction of the side flap, and a tape fastener having a laterally opposite side of the dorsal region of the diaper, wherein the side flap is A first flap located outside the absorbent core and a second flap located on the upper surface of the first flap, the second flap having the elastic band on the inner edge, and the outer edge having The first flap is joined to the first flap, is folded back outward between the inner and outer edges, and is joined to the first flap intermittently in the longitudinal direction along the folding line, and the folding The longitudinally opposed ends of the bent portion are joined to the non-folded portion of the second flap, so that they stand upright on the folding line due to the contracting action of the elastic band, and the intermittent gap is formed between the flap and the first flap. The diaper is characterized in that a pocket having an opening partitioned by a mechanical joining is formed. 2. The disposable diaper according to claim 1, wherein the intermittent joining extends continuously or intermittently from the fold line to the outside. 3. The disposable diaper according to claim 1, wherein the second flap is formed of a separate breathable waterproof sheet made of a material different from that of the first flap. 4. The first flap and the second flap are formed by respective portions of the topsheet and the backsheet extending outward from an outer edge of the absorbent core. The disposable diaper according to item 1.