JP2518953Y2 - Disposable diapers - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a disposable diaper used for infants, adults or incontinent persons.

In the following description, the present invention will be described in detail by taking a disposable diaper for infants as an example.

[Conventional technology]

As a disposable diaper for infants, for example, as one of the disposable articles, various types of disposable diapers have been conventionally proposed.

The main disposable diaper among them is provided with a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber positioned between these two sheets, and a pair of left and right side flaps. There is a so-called flat type in which fasteners are arranged at both end edges on the back side of the body so that they are fastened in the ventral region (Japanese Patent Publication No. 52-40267).
issue).

In such a flat type disposable diaper, an elastic member is stretched in the crotch region of the side flap so as to form a gather for preventing leakage of excrement from the crotch.

Therefore, although the side flaps are elasticized by the elastic member, they are arranged between the top sheet and the back sheet, so that the side flaps have poor air permeability, and generally, the back sheet is a plastic film, and therefore the texture is bad. In addition, since the joints such as the back sheet and the adhesive are high in rigidity, the elastic properties cannot be sufficiently exhibited, and there is a drawback that the followability of the side flaps to the movement of the wearer is poor.

On the other hand, JP-A-59-146651 and JP-A-62-2233
In the No. 02 publication, the gather is composed of a nonwoven fabric sheet and a stretchable elastic member to improve breathability,
A gather of disposable diapers with improved fit has been proposed.

[Problems to be solved by the device]

However, the gathers of these conventional disposable diapers are those in which a stretchable elastic member is fixed to one surface of a back sheet or a top sheet with a hot melt adhesive, but a hot melt adhesive is sprayed on the adhesive surface, Alternatively, the entire adhesive surface is coated, and the elastic elastic member is placed on the adhesive surface and fixed by adhesion.

Therefore, as shown in FIG.
The area of the joint portion 22 between the stretchable elastic member 20 and the nonwoven fabric sheet 21 and the interval between the adjacent joint portions 22, 22 are not uniform but random.

For this reason, as shown in FIG. 6, when the gathers 24 are formed, the elastic members 20 do not expand and contract uniformly, and the gathers 24 become irregular. There is a problem that the functions cannot be fully exhibited.

Here, the "texture" is generally evaluated organoleptically, and the elements of the texture include softness, appearance, touch and gloss.

Therefore, an object of the present invention is to provide a disposable diaper having a good texture and an excellent gather function.

[Means for solving the problem]

The present invention is directed to a liquid-permeable top sheet, a liquid-impermeable back sheet corresponding to the top sheet, an absorbent body which is fixed between the sheets and absorbs excrement, and the back sheet. It is composed of a non-woven sheet having a size larger than that of the pack sheet disposed on the outer side surface of the sheet, and the non-woven sheet includes a pair of left and right side flaps extending outward in the width direction from both side edges of the absorbent body, And a pair of back and abdominal waist slaps extending outward from both longitudinal ends of the absorbent body, respectively, and a pair of the waist slaps is bonded and fixed to the nonwoven fabric sheet by an elastic elastic member. The stretchable elastic members are arranged in the stretched state on the non-woven sheet, and the stretchable elastic members are provided on the non-woven sheet. A plurality of linear joint portions that intersect substantially at right angles to the extension direction are provided with a predetermined interval, and the elastic elastic member is joined and fixed at the intersection portion with the linear joint portion, and The non-woven fabric sheet is characterized in that both longitudinal edges thereof are folded back toward the top sheet so as to sandwich the stretchable elastic member, and both sides of the stretchable elastic member are fixed to the non-woven sheet. The above-mentioned object is achieved by providing a disposable diaper that does.

[Action]

In the disposable diaper according to the present invention, gathers are formed on both sides of the crotch or at the waist when worn.

The gathers are regularly and regularly formed at predetermined intervals.

〔Example〕

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5 of the accompanying drawings.

As shown in FIG. 2, the disposable diaper 1 according to the present invention comprises a liquid-permeable top sheet 2 forming a side in contact with the wearer's skin, and a liquid-impermeable back sheet 3 corresponding to the top sheet 2. An absorbent body 4 which is fixed between the two sheets 2 and 3 and absorbs excrement, and a non-woven fabric sheet 8 arranged on the outer side surface of the back sheet 3 and having a size larger than that of the back sheet 3. It is configured.

The nonwoven fabric sheet 8 is provided with a pair of left and right side flaps 5 and 5 extending outward in the width direction from both side edges of the absorbent body 4, and the side flaps 5 and 5 are worn by the wearer's waist. It is divided into waist regions 5A and 5A located at, and crotch regions 5B and 5B located at the crotch of the wearer. Waist flaps 7 and 7 on the back side and the ventral side that extend outward are provided from both ends in the longitudinal direction of the absorbent body 4, respectively.

The crotch regions 5B and 5B are provided with side flap gathers 9, and the waist flaps 7 and 7 are provided with waist flap gathers 10.

The gathers 9 of the side flaps are configured by tensioning and fixing the first elastic members 6 along the side edges of the back sheet 3.

On the other hand, the gather 10 of the waist flap is according to the present invention, and is formed by fixing the second elastic member 11 to the waist flap 7 of the nonwoven fabric sheet 8.

In the gather 10 of the waist flap, the longitudinal edge of the nonwoven fabric sheet 8 is folded back toward the top sheet 2 side, and the elastic member 11 is sandwiched by the folded portion 8A.

As shown in FIG. 1, the second stretchable elastic member 11 is intermittently bonded and fixed to the non-woven fabric sheet 8 by using a hot melt type adhesive, but the bonding and fixing portion is a hot melt type adhesive. Not limited to the agent, welding by heat, welding by ultrasonic waves, or the like may be used.

FIG. 3 shows a state in which the hot melt adhesive is applied to the nonwoven fabric sheet 8. As shown in FIG. 3, the hot melt wire 12 as the joint fixing portion is linearly applied in a direction orthogonal to the extension direction of the second elastic member 11 and in a stripe shape at regular intervals. The thickness of each hot melt wire 12 is preferably 0.1 to 5 mm, and the distance between the individual wires is 1 to 12 mm. The extended second elastic member 11
Is joined at the intersection of the non-woven sheet 8 with the hot melt wire 12, but the folded portion 8a of the non-woven sheet 8 is folded back along the folded line 13 so that the non-woven sheet 8 becomes the second stretchable elastic member 11. Are joined and fixed to both sides of the to form gathers as shown in FIG. The second elastic member 11 is preferably adjacent to the line portion of the waist flap 7, that is, the folded line 13. In this way, as shown in FIG. 1, bellows-like ridges having a regular and excellent appearance are formed.

As the second elastic member 11, any material known in the art, such as a thread rubber, a flat rubber, a film type rubber, or a tape-shaped polyurethane foam, can be used. As shown in FIG. Not only the thread rubber 11 of FIG.
May be used. In addition, the second elastic member 11 is 150%
Particularly preferably, the stress during elongation is 70 to 100 grams. The gathers are used in the disposable diaper of the present invention,
The second stretchable elastic member 11 can be arranged curvilinearly, for example, along the recessed portion 15 as well.

As the non-woven fabric sheet 8 in the present invention, one that is soft to the touch, soft, breathable, and preferably water repellent is used. Further, the top sheet 2 is preferably a liquid-permeable sheet that allows excrement to permeate into the absorbent body 4 and has a feeling close to that of underwear. Examples of such a liquid-permeable sheet include woven cloth, nonwoven cloth, and porous cloth. Films and the like are preferable.

In addition, a method of applying a hydrophobic compound such as a silicone oil or paraffin wax to the peripheral portion of the top sheet 2,
By applying a hydrophilic compound such as an alkyl phosphate ester in advance and washing the peripheral edge with warm water, a water repellent treatment can be applied to prevent leakage of urine or the like at the peripheral edge due to bleeding.

The back sheet 3 used in the present invention is a liquid-impermeable sheet having moisture permeability that allows vapors that have been stretched by adding a filler to a thermoplastic resin, and a sheet that has a feel similar to underwear, such as a film and a nonwoven fabric. A composite material or a composite material of a film and a woven fabric is used.

The absorbent body 4 is preferably made of defibrated pulp as a main material together with a term molecular water-absorbing polymer, and is preferably made of a thermoplastic resin, cellulose fiber, or a polymer water-absorbing polymer mixture which is heat-treated. The high water absorbing polymer may be present in any of the upper layer, the middle layer and the lower layer, or may be a mixture with pulp. The high molecular weight water-absorbing polymer has a retention performance capable of absorbing and retaining a liquid 20 times its own weight or more, and is preferably in the form of particles having a gelling property. , Starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer,
A crosslinked product of sodium carboxymethyl cellulose, an acrylic acid (salt) polymer and the like are preferable. The shape is preferably an hourglass shape according to the wearer's body shape, but may be rectangular.

 Next, the operation of this embodiment will be described.

The waist flap gathers 10 are formed by applying a hot-melt type adhesive in stripes at substantially equal intervals in the diaper manufacturing process, as shown in FIG. next,
The second elastic member 11 is stretched and arranged so as to be orthogonal to the hot melt wire 12.

Subsequently, the folded-back portion 8a is folded back from the folded-back line 13, and the second stretchable elastic member 11 is sandwiched between the non-woven fabric sheets 8.
The stretchable elastic member (11) is bonded and fixed at the intersection with the hot melt wire (12).

On the other hand, when the disposable diaper is worn, tape fasteners (not shown) provided in the waist regions 5A, 5A of the side flaps on the back side are attached and fastened to the waist regions 5A, 5A of the side flaps on the ventral side.

Thereby, the waist flaps 7 and 7 surround the wearer's waist, the crotch region 5B of the side flap 5 surrounds the leg, and the side flap gather 9 and the waist flap gather 10 are formed around the leg and the waist. .

The waist flap gather 10 according to the present invention forms regular bellows-like ridges, has a good appearance, and has a gather function evenly and uniformly so that the gather function is excellent as a whole.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

As a reference example of the present invention, as shown in FIG. 5, the end portion of the non-woven sheet 8 forming the gathers 10 of the waist flap is not limited to the configuration in which the folded-back portion 8a is provided, and a non-woven sheet sandwiched by a pair of non-woven sheets may be used. Can be mentioned. Note that FIG. 5 shows an example in which a band-shaped elastic member 14 is used as the elastic elastic member.

Further, in the above-described embodiment, the flat type disposable diaper 1 has been described as an example, but the present invention is not limited to this, and a pants type disposable diaper may be used.

Further, if the non-woven fabric sheet 8 is made of a water-repellent material, it is possible to prevent leakage due to seepage from the top sheet 2.

[Effect of device]

According to the present invention, it is possible to obtain a disposable diaper having a good texture and an excellent gather function.

Further, according to the present invention, the elastic member is partially joined, so that thermal deterioration of the elastic member can be prevented. That is, regarding the joining of the elastic member and the film sheet or the like, since the joining is generally performed through heat, the entire surface has been conventionally joined, so that the heat deterioration of the elastic member has been a problem.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing a waist gather portion of a disposable diaper according to an embodiment of the present invention, FIG. 2 is a plan view showing a developed state of a disposable diaper according to this embodiment, and FIG. FIG. 4 is a perspective view showing a gathered portion of a waist flap according to a modified example of the present embodiment, and FIG. 5 is a perspective view showing a gathered portion of a waist flap according to a reference example. FIG. 6 is a perspective view showing a conventional gather portion, and FIG. 7 is a plan view showing a fixed state of elastic members in the gather portion shown in FIG. 1; disposable diaper 8; non-woven sheet 9; side flap gathers 11 and 14; elastic elastic member 12; hot melt wire (joint part)

Claims (2)

(57) [Scope of utility model registration request] 1. A liquid-permeable top sheet, a liquid-impermeable back sheet corresponding to the top sheet, an absorbent body fixed between the two sheets to absorb excrement, The nonwoven fabric sheet is arranged on the outer surface of the backsheet and has a size larger than that of the backsheet. The nonwoven fabric sheet includes a pair of left and right side flaps extending outward in the width direction from both side edges of the absorber. , And a pair of waist flaps on the back side and the ventral side that respectively extend outward from both ends in the longitudinal direction of the absorbent body, and the elastic elastic members are bonded to the nonwoven fabric sheet on the pair of waist flaps. Gathers that are fixed are provided respectively, and the elastic elastic member is disposed on the nonwoven sheet in an expanded state, and the elastic sheet has the elastic portion. A plurality of linear joint portions substantially intersecting at right angles to the extension direction of the are provided at a predetermined interval, the elastic elastic member is joined and fixed at the intersection with the linear joint portion, and The nonwoven fabric sheet is folded back to the top sheet so that both end edges in the longitudinal direction sandwich the stretchable elastic member, and both sides of the stretchable elastic member are fixed to the nonwoven fabric sheet. Disposable diaper. 2. The disposable diaper according to claim 1, wherein the predetermined intervals are substantially equal intervals.