JP3121205B2 - Disposable 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 disposable diaper for infants, adults and incontinent persons, and more particularly to a so-called pants-type disposable diaper.

[0002]

2. Description of the Related Art Generally, a disposable diaper includes a vertically long main body including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber interposed between the two sheets. The abdomen is located on the abdomen of the wearer when worn, and the back is located on the back. As such a disposable diaper, for example, a flat type in which a fastening device is disposed on both side edges (side flaps) of a back side and the fastening device is fastened to a ventral side of a main body when worn is known. (Japanese Patent Publication No. 52-40267).

Recently, a pair of left and right leg openings and a pair of left and right waist openings are formed by joining and fixing the abdominal and back sides of a pair of left and right side flaps formed on both sides along the longitudinal direction of the main body. There has been proposed a so-called pants-type disposable diaper in which a diaper is formed (Japanese Patent Application Laid-Open No. Sho 61-2).
No. 07605). The pants-type disposable diaper,
The pair of leg openings and one waist opening are formed so as to be extendable and contractible, respectively, so as to fit the body shape, and usually, the wearer himself can wear it in a standing position, so that the infant can wear it. It is used for toilet training to promote "diaper detachment" or for incontinent or walkable adults.

[0004] Pants-type disposable diapers of this type are characterized in that they can be raised and lowered by the wearer in the same way as ordinary underwear, as compared with so-called flat diapers. In order to prevent the excrement from leaking out by the wearer and to allow the wearer to easily wear the excrement, the pants-type disposable diaper is required to have an excellent fit. Furthermore, it is required that the wearer has sufficient follow-up ability even for active activities of the wearer.

To cope with such a demand, Japanese Patent Laid-Open No.
Japanese Patent No. 4364/1992 discloses an elastic side panel (side member) provided at a side portion connecting a ventral side and a back side of a main body.
And a configuration in which elastic members are disposed at the abdominal end and the back end of the main body. That is, as shown in FIG. 4 , a main body 55 of a conventional pants-type disposable diaper 51 is provided.
, Side flaps 59a, 59b extend outwardly of the absorber 54 at both side edges of the crotch, and waist flaps 57a,
57b extends, and side flaps 59a, 59
Elastic members 61, 61 are arranged in a stretchable manner in each of b. Also, the waist flaps 57a, 57
Elastic members 58a and 58b are arranged at b in a stretchable state in order to improve the fit around the waist of the wearer. Side panels 62, 62 are provided on both sides of the back of the main body 55, and side panels 6 are provided on both sides of the abdomen.
3 and 63 are provided. Each side panel 62, 63
Are formed as members separate from the main body 55 using elastic members, respectively, and the side panels 62 and 63 have end portions 64,
64 are joined together.

[0006]

However, as shown in FIG. 7, the conventional underpants-type disposable diaper 51 is mounted by elastic members 61, 58a, 58b and elastic side panels 62, 63 as shown in FIG. There is the following problem from the relationship between the formed elastic line of the leg opening and the formed elastic line at the waist opening (the elastic stress curve is indicated by a hollow arrow).

[0007] The term "stretch stress line" indicates a stretchable portion gathered by an elastic member. That is, although the stretching stress lines of the respective openings intersect as they extend, a gap portion X where there is no stretching stress line may exist between the stretching stress lines. For example, there is a problem that a gap X is generated between the diaper and the wearer when the wearer assumes a bent position in the abdomen of the wearer, which causes leakage.

Further, since the side panels 62 and 63 are formed of members separate from the main body, there is a problem that the number of parts and the manufacturing process of the diaper are complicated and the cost is increased. Furthermore, the side panels 62 and 63 are one member, and the elastic properties of each part are the same. Therefore, in order to increase the tightening force in order to prevent slip-off and improve fit, it is necessary to increase the elasticity of the entire side panels 62 and 63, but this gives the wearer an unnecessary feeling of pressure,
Alternatively, the operability of attachment / detachment is impaired.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pants-type disposable diaper capable of reliably preventing leakage and reducing costs.

[0010]

SUMMARY OF THE INVENTION The present invention comprises a body having a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorber disposed between the two sheets. When worn, the abdomen located on the abdomen of the wearer, and is divided into a dorsal portion located on the dorsal side, and the respective side edges of the abdominal portion and the dorsal portion are joined and fixed. In a pants-type disposable diaper having a waist opening and a pair of leg openings formed therein, the waist opening and the pair of leg openings each have gathers that are substantially continuous over the entire periphery thereof. An elastic member is provided, and the main body is further provided with the abdominal part and the upper part on both sides around the waist.
The above object has been achieved by providing a disposable diaper characterized by comprising an elastic member forming a gather substantially continuous over the back side .

When the disposable diaper of the present invention is worn, a continuous gather formed integrally with the main body continuously acts on the waist opening and the pair of leg openings, and a gap is formed between the diaper and the wearer. Without preventing formation of excrement, leakage of excrement from the diaper is reliably prevented. “Continuous” in the present specification means that the stretching stress line continues without interruption. For example, it is only necessary that the side portion of the present invention is substantially continuous via the joint portion, and it is not necessary that the elastic member be continuous.

Further, since the continuous gathers are formed integrally with the diaper main body, the number of parts is reduced as compared with a conventional product formed of a separate member (see the above-mentioned Japanese Patent Application Laid-Open No. 2-4364). In addition, the manufacturing process is simplified, and the manufacturing cost can be reduced. Furthermore, the gather of the present invention can improve the fitting property and the operability by arranging a plurality of elastic members side by side or overlapping one another.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. 1 to 3 of the accompanying drawings.

First, the disposable diaper 1 shown in FIGS. 1 and 2 will be described.
The disposable diaper according to the present invention is provided with a basic configuration, and has a liquid-permeable top sheet 2 on the side in contact with the wearer's skin, a liquid-impermeable back sheet 3 corresponding to the top sheet 2, A main body 5 comprising an absorber 4 fixed between the two sheets 2 and 3 for absorbing excrement
It has.

The body 5 is divided into an abdominal part 5a located on the abdomen of the wearer when worn and a dorsal part 5b located on the dorsal side. Are formed substantially symmetrically about a vertical center line 6a located substantially at the center of the main body 5. In the abdominal part 5a and the back part 5b of the main body 5, a pair of waist flaps 7a, 7b extending outward from the both ends in the longitudinal direction of the absorber 4 and the respective waist flaps 7a, 7b Elastic members 8a and 8b forming gathers respectively, a pair of left and right side flaps 9a and 9b extending outward in the width direction from both side edges of the absorber 4, and legs 10a of the side flaps 9a and 9b, Elastic members 11a, 11b forming gathers are provided on each of the side flaps 10b, and the back flaps 5b, 5a on the abdominal side are partially joined and fixed at both side edges 12b, 12a, respectively.
Waist opening 13 and pair of left and right leg openings 14
a, 14b (see FIG. 2).

The waist flaps 7a and 7b and the side flaps 9a and 9b are portions where the top sheet 2 and the back sheet 3 overlap each other, and are formed integrally with the main body 5. Elastic members 8a, 8b of waist flap
Along the edges of the waist flaps 7a, 7b respectively
It is continuously joined to the top sheet 2 and the back sheet 3 as a plurality of filaments arranged substantially in parallel. Thus, when the waist opening 13 is formed, the elastic members 8a and 8b of the waist flap are arranged continuously along the periphery of the waist opening 13.

On the other hand, the side flap elastic members 11a,
11b is an arc-shaped elastic member 11a and a linear elastic member 1
1b and an arc-shaped elastic member 11a
Are leg portions 10 at side flaps 9a and 9b.
a and 10b are formed in an arc shape along the horseshoe shape.
Further, in the horseshoe-shaped concave portion of the side flap, a linear elastic member 11b is linearly extended from the side flaps 9a, 9b and provided to intersect with the arc-shaped elastic member 11a. This side flap elastic member 11a,
11b is disposed adjacent to the edges of the pair of leg portions, that is, adjacent to the side edges of the side flaps 9a and 9b in the crotch section, and the side flap elastic members 11a,
The distance from the outer edge of the absorber to the innermost edge of the elastic members 11a, 11b is preferably 0 to 50 mm, more preferably 0 to 20 mm.
５０50 mm, more preferably 0-20 mm.

Elastic members 11a, 11b of side flaps
Is generally joined to the main body 5 of the pants-type disposable diaper 1 in an extended state by means of ultrasonic welding, heat welding, an adhesive or the like, which are well known in the art. Any thread known in the art, such as thread rubber, flat rubber, film-type rubber or tape-like foamed polyurethane, may be used, and one or more may be used. The arrangement of the elastic members 11a and 11b is symmetric. Further, those having a stress at the time of 150% elongation of 70 to 100 grams are preferred. Further, the stress of the elastic members 11a and 11b may be made different so that no gap is formed in the opening, or the elastic members 11a and 11b may be formed so that the stress on the outside of each of the elastic members becomes higher.

Elastic members 8a, 8b of waist flap
Is preferably a non-woven fabric type having elasticity, and if anything, a material having greater elasticity in the width direction than in the longitudinal direction is preferable. The elastic members 8a and 8b of the waist flaps are bonded and fixed to the waist flaps 7a and 7b by using an adhesive such as hot melt, ultrasonic welding, or thermal welding. Further, the elastic members 8a and 8b of the waist flap are connected in a state where both can be expanded and contracted.

Here, in the present specification, the term "coupling" means that the elastic member and the elastic member are in contact with each other in a state where at least a stretching stress line can be generated, as in the above-mentioned "continuous". Preferably, both are directly or indirectly polymerized and joined.

The top sheet 2 is preferably a liquid-permeable sheet that allows excrement to permeate into the absorber 4 and has a feeling close to that of underwear. Examples of such a liquid-permeable sheet include woven cloth, non-woven cloth, and the like. A porous film or the like is preferred. Also, a method of applying a hydrophobic compound such as a silicone oil agent or paraffin wax to the peripheral portion of the top sheet 2 or a method of applying a hydrophilic compound such as an alkyl phosphate ester in advance and washing the peripheral portion with warm water are used. Water treatment,
Leakage due to bleeding of urine or the like at the peripheral portion can be prevented.

The back sheet 3 is made by adding a filler to a thermoplastic resin such as polyolefin, and is stretched. The back sheet 3 has a moisture-permeable liquid-impermeable sheet that allows vapor to permeate, or a sheet that has a feeling similar to underwear, such as a film. A composite material of a nonwoven fabric or a composite material of a film and a woven fabric is used.

The absorbent 4 is preferably composed mainly of defibrated pulp and used in combination with a high-molecular-weight water-absorbing polymer.
Thermoplastic resin, cellulose fiber, preferably heat-treated to a mixture of high-molecular-weight water-absorbing polymer, the presence position of the high-molecular-weight water-absorbing polymer may be any of the upper layer, the middle layer, the lower layer, even if mixed with pulp Good. The high molecular weight water-absorbing polymer has a holding performance capable of absorbing and holding a liquid 20 times or more its own weight, and is preferably in the form of particles having a gelling property. , Starch-acrylic acid (salt) graft polymer, saponified starch-acrylonitrile copolymer,
A crosslinked product of sodium carboxymethyl cellulose, an acrylic acid (salt) polymer and the like are preferable.

In the pants-type disposable diaper 1 described above, the diaper main body is folded in half along the horizontal center line 6b, and both side edges 12a, 12a of the back portion 5b and side edges 12a of the abdominal portion 5a are formed.
b and 12b are obtained by joining and fixing. At this time, the elastic member 11b of the side flap on the back side 5b
The elastic member 8b of the waist flap 7b on the back side is overlapped with the elastic member 8b of the waist flap 7a on the abdominal side.

When the pants-type disposable diaper 1 is worn, the pants-type disposable diaper 1 is connected to the pair of leg openings 14a, 14b by the elastic members 11a, 11b of the side flaps, as shown in FIG. The waist opening 13 forms a continuous gather by the elastic members 8a and 8b of the waist flaps on the back side and the abdomen side. Therefore, the above-mentioned pants-type disposable diaper 1 has a continuous gather formed integrally with the main body and a waist opening 13 and leg openings 14a, 1a.
4b continuously acts to improve the fit to the wearer, and the leakage of excrement from the diaper is reliably prevented.

Also, the waist flap elastic member 8a,
8b and the elastic members 11a and 11b of the side flaps
Since the configuration is only to be joined to the main body 5, the number of parts is reduced, and the manufacturing process is simple. In addition, the elastic members 8a, 8b and 11a, 11b can express a stretching stress that matches the body shape by juxtaposing or intersecting a plurality of elastic members, thereby improving fit and preventing leakage. Can be. The elastic members of the side flaps are not limited to the configuration in which the elastic member 11a arranged in an arc shape and the elastic member 11b arranged in a straight line intersect, and are not limited to being arranged in one curved shape but arranged in a curved shape. It may be.

Further, the elastic members 11b of the side flaps are not limited to being arranged in a straight line, but may be arranged in a curved line.

Next, an embodiment of the present invention will be described with reference to FIG .

In the disposable diaper 18 according to the embodiment shown in FIG. 3 , the waist elastic members 16a and 16b
It is arranged only on both sides of the waist without touching.
Elastic members 8a and 8b of waist flap, elastic members 11a and 11b of side flap, and waist elastic member 16
Both a and 16b are preferably natural rubber, polyurethane, foamed polyurethane or the like, and may be any of a thread shape and a belt shape. Since the disposable diaper 1 of the present embodiment has the above-mentioned configuration, it fits without slipping down to any movement of the infant during wearing, and furthermore, since there is no gap at the side, leakage of excrement is prevented. It can be reliably prevented.

[0030]

Test Example The following leak test and slip-off test were performed using the following disposable diaper (the disposable diaper according to the embodiment shown in FIG. 3 ).

[0031]

[0032]

<Leak test and slip-off test>
The disposable diaper 15 described above is attached to a baby model weighing 10 kg and walked 2,000 times.
After going round, the amount of slippage of the diaper was measured. Next, the model is placed on its side or in a prone position, and artificial urine (physiological saline) is supplied from the model tube such that the discharge rate from the urination unit is 5 g / sec. The effect of preventing leakage by No. 4 was observed. In addition, the following artificial soft stool was supplied from the model tube such that the defecation speed from the excretory part was 4 g / sec, and the effect of preventing fecal leakage in a lying state was similarly observed. Artificial loose stool: Bentonite 3 wt% suspension adjusted to a viscosity of 10 cp with carboxyethylcellulose

[0034] In Test Example 1 This test, some elastic members 16a of the waist, is provided between the four top sheet and the back sheet at 180% elongation state 16b, to produce a disposable diaper 18 shown in Figure 3,
Next, the above test was performed using the disposable diaper 18, and the results are shown in the following table.

Comparative Test Example 1 In this test, a comparative product was prepared without using the waist elastic members 16a and 16b, and the same test as in Test Example 1 was performed. The results are shown in the following table. <Test results> According to the results shown in the table below, in this test, the amount of slip-off was small, the amount of artificial urine and artificial stool absorbed was large, and the leak-proofing property was excellent. .

[0036]

[Table 1]

The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

For example, the elastic member of the side flap is not limited to the structure in which the elastic member 11a arranged in an arc shape and the elastic member 11b arranged in a straight line intersect, and may be arranged in a single curved shape. . Further, the elastic members 11b of the side flaps are not limited to being arranged in a straight line, but may be arranged in a curved line.

[0039]

According to the disposable diaper of the present invention, leakage of excrement can be reliably prevented and cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded view of the underlying structure used had discarded diaper of the present invention.

FIG. 2 is a perspective view showing a state of wearing the disposable diaper shown in FIG.

FIG. 3 is a disposable diaper according to an embodiment of the present invention .
It is a perspective view showing a wearing state .

FIG. 4 is a development view of a conventional disposable diaper .

FIG. 5 shows a state of wearing a conventional disposable diaper .
It is a perspective view .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 4 Absorber 5 Main body 8a Elastic member 8b Elastic member 11a Elastic member 11b Elastic member 13 Waist opening 14a Leg opening 14b Leg opening 16a Elastic member 16b Elastic member 18 Disposable diaper

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-263806 (JP, A) JP-A-62-263807 (JP, A) JP-A-53-19246 (JP, A) JP-A-2- 4364 (JP, A) JP-A-2-4367 (JP, A) JP-A-4-32718 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61F 13/15-13 / 84

Claims (3)

(57) [Claims] 1. A body having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the two sheets, wherein the body is placed on the abdomen of the wearer when worn. The abdomen and the dorsal part are located on the dorsal side, and the waist opening and the pair of leg openings are formed by joining and fixing both side edges of the abdominal part and the dorsal part. In the pants-type disposable diaper in which the portion is formed, the waist opening and the pair of leg openings are provided with elastic members that form gathers that are substantially continuous over the entire periphery of the peripheral edge, respectively. The main body is further provided with the above-
A disposable diaper, comprising an elastic member forming a gather substantially continuous over the back side and the back side . 2. The disposable diaper according to claim 1, wherein the gather is formed by a plurality of elastic members being juxtaposed at intervals. 3. The gather according to claim 1, wherein the leg opening forms a substantially continuous gather by partially overlapping a plurality of elastic members.
Use diapers as described.