JP3846076B2 - Disposable diapers - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disposable diaper provided for infants or adults. More specifically, the present invention relates to a disposable diaper having a hook-and-loop fastener that does not peel off from the diaper surface during attachment and detachment and can be easily attached and detached.
[0002]
[Prior art]
Conventionally, in a deployable diaper, it is well known that a fastening tape is extended to the left and right edges of either the front or back body of a side flap, and the front body part and the back body part are attached and detached by this fastening tape. Technology. As this fastening tape, one using a surface fastener together with an adhesive tape is well known. For example, Japanese Patent Application Laid-Open No. 63-309606 discloses that a hook member or a loop member, or a hook-and-loop fastener member, is provided on the inner surface of a fastening tape extending from both side edges of the rear body of a used diaper. Diapers have been proposed.
Japanese Laid-Open Patent Publication No. 9-154485 discloses that a hook member which can be engaged with a three-dimensional gather sheet on both side edges of the back side part is disposed on both side edges of the back side part of the used diaper. Diapers have been proposed.
[0003]
[Problems to be solved by the invention]
In general, the attachment and detachment by the hook-and-loop fastener has a higher engagement force than the adhesive tape, and is very beneficial by repeated joining. However, in the case of a disposable diaper disclosed in Japanese Patent Application Laid-Open No. 63-309606, the base tape and the surface fastener member on the base tape are simply bonded to each other, and thus several times. When the engagement force between the hook member and the loop member is greater than the adhesive force between the base tape and the hook-and-loop fastener member due to detachment, a peeling force is generated between the base tape and the hook-and-loop fastener member, and the hook-and-loop fastener member It may come off.
In addition, in the case of a used diaper shown in Japanese Patent Laid-Open No. 9-154485, in which side flap solid gathers are bonded as the engaging portion, since the tape tab is not in the back sheet, it is difficult to attach and remove it. There is no stiffness, and it takes time to attach and detach.
[0004]
The object of the present invention is to eliminate the above-mentioned problems of conventional diapers, prevent peeling of the hook-and-loop fastener member from the diaper when the engaging force of the hook-and-loop fastener is strong, and further improve the operability when attaching and detaching. The goal is to provide a good diaper.
[0005]
[Means for Solving the Problems]
The present invention includes a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber disposed between the two sheets, and an outer side extending from both longitudinal edges of the absorber (the top sheet). A side flap (formed by a back sheet), a fastening tape is disposed on both side edges (the top sheet surface) of the side flap on the back body side, and the back sheet surface on the front body side is In the disposable diaper where the front patch to which the fastening tape is joined is arranged,
The fastening tape is formed by one member constituting a hook-and-loop fastener, and the front patch is formed by the other member constituting the hook-and-loop fastener,
Furthermore, the present invention relates to a disposable diaper characterized in that a side edge located outside a diaper of a hook-and-loop fastener member forming the fastening tape is covered with a tape tab together with a side edge of a side flap.
[0006]
The present invention also relates to the above-mentioned disposable diaper, wherein the fastening tape is formed of a hook member of a hook-and-loop fastener, and the front patch is formed of a loop member of the hook-and-loop fastener.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The used diaper of the present invention is such that the fastening tape is formed by one member constituting the surface fastener, the front patch is formed by the other member constituting the surface fastener, and further the surface forming the fastening tape. The side edge located in the outer side of the diaper of a fastener member is covered with the tape tab with the side edge of a side flap.
Since the side edge of the hook-and-loop fastener member is covered with the tape tab, the hook-and-loop diaper of the present invention having such a configuration does not peel off the hook-and-loop fastener from the diaper when the hook-and-loop fastener is attached or detached, The hook-and-loop fastener can be easily attached and detached by picking the tape tab.
[0008]
The top sheet used in the present invention is a hydrophilic or hydrophobic nonwoven fabric, woven fabric, porous plastic film or the like, and its constituent fibers are polypropylene, polyethylene, polyester, nylon or polyester, polypropylene, polyethylene, nylon, etc. These fibers may be a composite fiber composed of two or more components, and polyester / polyester and polypropylene / polyethylene composite fibers are preferred from the viewpoint of strength, but are not particularly limited.
[0009]
The top sheet need not be composed of a single sheet, and may be composed of a plurality of sheets, for example, a side top sheet, such as changing the sheet between the absorber upper surface and the side flaps. In addition, when the top sheet is composed of a plurality of sheets, each sheet may use a different material, but the same material may be used.
[0010]
As the side top sheet, a non-woven fabric of synthetic fiber using polyethylene, polypropylene, polyester, or other thermoplastic resin as a raw material is used, but this side sheet is preferably water-repellent, and the non-woven fabric is made of a thermoplastic resin as a raw material. The film may be laminated to make it liquid impervious.
[0011]
As the back sheet used in the present invention, a liquid-impermeable polyethylene film or the like can be employed. More preferably, a polyethylene film provided with a large number of micropores that do not allow liquid molecules to permeate to prevent stuffiness, a moisture-permeable film stretched by adding a filler to a thermoplastic resin, or these films Using a composite sheet with non-woven fabric bonded to the outside releases excess moisture inside the diaper, making it less likely to cause rash and rash, making it more comfortable in terms of moisture permeability and touch. be able to.
[0012]
The absorbent body is mainly made of cotton pulp and highly water-absorbing material, but is not particularly limited, and may be a water-absorbing sponge or water-absorbing sheet, and any water-absorbing property can be used. It is preferable that the entire structure is wrapped with a tissue. The shape of the absorber may be an hourglass shape, a rectangular shape, or the like, but the hourglass shape can provide better fit.
The cotton-like pulp in the present invention is obtained by making a chemical pulp, a mechanical pulp, or a chemical mechanical pulp sheet into a cotton-like shape by a pulverizer. Pulp raw materials are not limited to conifers, but hardwoods, straw, bamboo, and kenaf are also applicable. The amount of the pulp used varies depending on the intended absorber, for example, whether it is used singly, in a plurality of layers, or in combination with other absorbers, but is generally 50 to 400 g / m ² . Is done. Moreover, synthetic fiber, a heat-fusion component, an adhesive agent, etc. may be contained with cotton-like pulp.
[0013]
As the superabsorbent material, starch-based, cellulose-based, synthetic polymer-based, etc. can be used, but those that absorb water more than 20 times their own weight, and polyacrylic acid-based materials are the most in terms of absorption performance. Is appropriate. Also, the shape is not particularly limited, such as fibrous, granular or sheet-like.
[0014]
In the disposable diaper of the present invention, elastic members are arranged at the waist and leg portions. The elastic member can be a stretchable elastic body used for ordinary diapers such as urethane film, urethane thread, urethane foam, and thread rubber. These stretchable elastic bodies are arranged in a stretched state and are hot-melted. It is adhesively fixed by water-soluble glue such as starch or CMC (carboxymethylcellulose), adhesive with high fluidity, or adhesion by heat or ultrasonic waves.
[0015]
In the present invention, the fastening tape and the front patch are formed of a hook member and a loop member constituting a hook-and-loop fastener, and the side edge located outside the diaper of the hook-and-loop fastener member forming the fastening tape is a tape tab. Covered.
Moreover, in this invention, although the surface fastener member which forms a fastening tape may be directly attached to the surface sheet of a diaper, you may attach to a surface sheet via a base tape.
[0016]
The material of the tape tab and base tape used in the present invention includes polyolefin resins such as polypropylene, polyethylene and polystyrene, polyester resins such as polyethylene terephthalate, polybutylene terephthalate and copolymers thereof, and polyamides such as nylon 6 and nylon 66. Examples thereof include biodegradable resins such as resins, polyvinyl alcohol resins, polyacrylonitrile resins, polylactic acid, and fatty acid polyesters.
[0017]
As hook members for forming the hook-and-loop fastener used in the present invention, Kuraray's Magic Tape (registered trademark), YKK's Quicklon (registered trademark), etc., hook shape, mushroom shape, hook shape, etc. And a hook member of a commercially available sheet-like mechanical hook tape in which a large number of engagement members are arranged.
Examples of the loop member include nylon, polyethylene, polyester, polypropylene, or a woven fabric or a nonwoven fabric made of a combination thereof.
[0018]
In the present invention, when a loop member is used as the front patch, when the back sheet is formed of a film made of a thermoplastic resin, it is necessary to attach a loop member made of a nonwoven fabric or the like to the back sheet surface. When the sheet is formed as a composite sheet in which a nonwoven fabric is bonded to the surface of the film, the nonwoven fabric on the surface of the backsheet may be used as it is as a front patch, and it is not particularly necessary to attach a loop member.
[0019]
Here, the combination of the hook member and the loop member is selected according to the balance of the engaging force and the shearing force, and the initial peel engaging force is preferably 50 to 400 g / 25 mm and the shearing force is preferably 3000 g / 25 mm or more. Here, the initial peel engagement force is a 25 mm wide hook member and a loop member, and a 2 kg load roller is reciprocated once, and a 2 kg shear stress is applied for 2 seconds. It is measured. In addition, the 25 mm wide hook member and the loop member are overlapped and the 2 kg load roller is reciprocated once for the shearing force, followed by pressure bonding and then peeling in the shearing direction (the direction along the joint surface between the hook member and the loop member). The stress is measured.
[0020]
【Example】
Hereinafter, although the used diaper of this invention is demonstrated in detail with reference to drawings, this invention is not restrict | limited at all by these.
FIG. 1 is a partially cut-away plan view of a used diaper of the present invention.
In FIG. 1, a used diaper 1 includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, an absorbent body 4 disposed between both sheets, and a longitudinal direction of the absorbent body 4. It is basically formed from side flaps 5 extending outward from both side edges.
Further, the side flap 5 of the used diaper 1 is formed by a side top sheet 10 extending from both side edges of the top sheet 2 and a back sheet 3 extending from both side edges of the absorbent body 4. Fastening tape 7 is attached to the surface of the side top sheet 10 at both side edges of the side flap 5 on the side, while the front patch 6 to which the fastening tape 7 is joined is attached to the surface of the back sheet 3 on the front body 8 side. It has been.
In this case, the fastening tape 7 is formed of a hook member 7b of a hook-and-loop fastener, while the front patch 6 is formed of a loop member of a hook-and-loop fastener. Moreover, the side edge located in the outer side of the diaper of the hook member 7b is covered with the tape tab 7a.
Further, in the crotch region of the used diaper 1, a leg-around elastic member 11 is disposed between the back sheet 3 and the side top sheet 10 that form the side flap 5.
[0021]
FIG. 2 is a cross-sectional view of the used diaper shown in FIG. 1 taken along the line XX ′, and shows a cross-sectional structure of the fastening tape 7.
In FIG. 2, the fastening tape 7 is formed of a hook member 7b of a hook-and-loop fastener, and is adhesively fixed to the side top sheet 10 via a base tape 7c. Moreover, the side edge located outside the diaper of the hook member 7b is covered with the tape tab 7a together with the side edge of the side top sheet 10 forming the side flap and the side edge of the back sheet 3, and both end portions of the tape tab 7a are These are respectively fixed to the side edge of the hook member 7b and the back sheet.
In FIG. 2, the fastening tape is formed by a hook member of a hook-and-loop fastener, but may be formed by a loop member. In FIG. 2, the hook member 7 b is bonded and fixed to the side top sheet 10 via the base tape 7 c, but the hook member 7 b may be bonded and fixed directly to the side top sheet 10.
[0022]
【The invention's effect】
The used diaper of the present invention is a fastening tape composed of a hook-and-loop fastener for making the front and back bodies detachable attached to the top sheet surface at both side edges of the side flaps of the back body, A side edge located outside the diaper of the hook-and-loop fastener is covered with a tape tab.
The used diaper of the present invention having such a configuration is such that the hook-and-loop fastener does not come off from the diaper when the hook-and-loop fastener is attached and detached, and the operability of attachment and detachment is good by picking the tape tab. .
[Brief description of the drawings]
FIG. 1 is a partially cutaway plan view of a disposable diaper of the present invention.
FIG. 2 is a cross-sectional view showing a state where the used diaper of FIG. 1 is cut along the line XX ′.
[Explanation of symbols]
1: Used diaper 2: Top sheet 3: Back sheet 4: Absorber 5: Side flap 6: Front patch 7: Fastening tape 7a: Tape tab 7b: Hook member 7c: Base tape 8: Front body part 9: Rear body Part 10: Side top sheet 11: Elastic member elastic around leg

Claims (2)

It has a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent body arranged between these two sheets, and side flaps extending outward from both longitudinal edges of the absorbent body. In the disposable diaper in which the fastening tape is arranged on both side edges of the side flap on the back body side, and the front patch to which the fastening tape is joined is arranged on the back sheet surface on the front body side,
The fastening tape is formed by one member constituting a hook-and-loop fastener, and the front patch is formed by the other member constituting the hook-and-loop fastener,
Furthermore, the use diaper characterized by the side edge located in the outer side of the diaper of the hook_and_loop | surface fastener member which forms the said fastening tape being covered with the tape tab with the side edge of a side flap. The disposable diaper according to claim 1, wherein the fastening tape is formed of a hook member of a hook-and-loop fastener, and the front patch is formed of a loop member of the hook-and-loop fastener.

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