JP2597841B2 - Disposable diapers - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a disposable diaper having an elastic member at a waist.

[Conventional technology]

It is well known that an elastic member is used to fit a diaper to a user and prevent leakage from the waist circumference (so-called front-back leakage). Conventionally, various types of elastic members have been proposed. For example, JP-A-59-
As seen in 59901, heat-shrinkable elastic members,
As disclosed in Japanese Patent Application Laid-Open No. 57-193501, an elastic member is provided at the front and rear waist ends.

[Problems to be solved by the invention]

However, the conventional elastic members are intended only to fit the diaper to the wearer's waist by fitting it, cannot follow the movement of the wearer, and a gap is formed between the wearer's waist and the diaper. Yes, emissions often leak from it.

In particular, when the elastic member is inserted into the entire lengthwise end of the diaper, a small gather is generated, and excreted liquid (urine) exudes from a gap between the gathers.

Further, as the elastic member used around the waist, a rubber material having a large tension is mainly used, and as a result, the wearer tends to give an excessive feeling of pressure.

Therefore, a main object of the present invention is to effectively prevent leakage before and after, provide a comfortable fit to a wearer, and improve the disposability of a disposable diaper.

[Means for solving the problem]

The present invention for solving the above-described problems and achieving the object of the present invention is such that the body fluid absorber is wrapped between the water-permeable top sheet and the water-impermeable back sheet, and extends outward from the end of the absorber,
The front waist and the back waist have flaps at the waist corresponding positions and where there is no absorber, and elastic members are fixed along the waist direction of both flaps, and further worn on both sides of the back waist In a disposable diaper having a coupling tape that is also coupled to the front waist, a length of the elastic member of the front waist is shorter than a length of the elastic member of the rear waist, and a longitudinal end of the elastic member of the front waist. And a distance from the corresponding side edge of the flap portion is longer than a distance between the longitudinal end of the elastic member of the rear waist portion and the corresponding side edge of the flap portion. .

[Action]

According to the present invention having the above configuration, the following operation and effect can be obtained.

The elastic member at the rear waist is longer than the elastic member at the front waist, the elastic member at the front waist is shorter, and the elastic member at the front waist is more stretchable than the elastic member provided at the rear waist. Is small, the tension of the elastic member is unevenly distributed mainly on the back,
Since the front waist (abdomen) is hardly tightened, a comfortable fit is provided to the wearer.

The length of the elastic member provided on the front waist is short, and as a result, the distance between the longitudinal direction of the elastic member and the side edge of the flap portion is longer than that of the rear waist, so that the diaper can be easily attached to the user.

That is, in order to attach the diaper, the bonding tape adhered to both side edges of the rear waist flap is adhered to the front waist flap. At this time, the elastic member length of the front waist is long, and the elastic member If the distance from the end to the side edge of the flap is short, it is necessary to adhere the connecting tape while stretching the flap of the front waist, which is contracted due to the contraction of the elastic member, and it is troublesome.

However, in the present invention, the elastic member length of the front waist is short,
And since the distance from the elastic member end of the front waist to the flap side edge is long, the flap portion of the front waist does not shrink so much in the vicinity of the flap side edge, the amount of stretching operation is small and the bonding tape can be easily adhered, and the diaper Installation becomes easy.

In addition, the so-called back-and-forth leakage from the longitudinal direction of the diaper is frequently performed with the back waist (back) down and often leaks from the back side. It is necessary to provide a sufficient contraction force (length) by making the elastic member longer than the elastic member length. Even in this case, when wearing the diaper, the back side of the diaper is deployed to lower the waist of the wearer, and then the flap By pulling both sides outward, the elastic member is less likely to contract again due to the weight of the wearer's waist, and therefore does not impair the attachment of the connecting tape to the front.

Thus, the improvement of the disposability of the disposable diaper, the improvement of the fit (prevention of excessive pressure on the abdomen), and the increase of the front-rear leakage prevention effect can be solved at once.

[Embodiment of the invention]

Hereinafter, the present invention will be described in further detail with reference to examples of a figure shown in the drawings.

FIGS. 1 and 2 show a first embodiment of a disposable diaper. This diaper is composed of a top sheet 1 made of a water-permeable material such as a nonwoven fabric and a back sheet 2 made of a water-impermeable material such as polyethylene. It has a basic configuration in which the absorbent body 3 mainly composed of cotton-like pulp is wrapped while leaving the surroundings.

On both sides of the diaper, elastic elastic members 4 such as rubber are provided along the longitudinal direction of the diaper (vertical direction in FIG. 1). In addition, before and after the flap portion 5 where the absorber 3 is not present at the longitudinal end of the diaper, preferably a heat-shrinkable elastic band 6 is provided along the width direction of the diaper (the left-right direction in FIG. 1).
A and 6B are provided. These elastic bands 6A and 6B are the top sheet 1
And the back sheet 2. The heat-shrinkable elastic bands 6A and 6B which expand and contract in the waist direction are fixed to at least one of the sheets 1 and 2 in an unshrinked state and shrink by receiving heat later. Shrink the part.

Reference numeral 7 denotes a binding tape. The bonding tape 7 is bonded to the back sheet 2 by hot melt or the like.
The basic layer structure of the bonding tape 7 itself is known to those skilled in the art as a two-layer tape. In use, the bonding tape 7 is adhered to the front surface of the disposable diaper, thereby bonding the front and rear waist flaps.

Incidentally, the feature of the present invention is the length of the post-heat-shrinkable elastic band 6A.
The relationship between lB and the length lF of the front heat-shrinkable elastic band 6B is set as lB> lF, and the distance lBL from the rear heat-shrinkable band 6A to the left edge of the flap.
And the distance lF from the pre-heat-shrinkable elastic band 6B to the left edge of the flap
The relationship between L and lBL <lFL, and the relationship between the distance lBR from the rear heat-shrinkable elastic band 6A to the right edge of the flap and the distance lFR from the front heat-shrinkable elastic band 6B to the right edge of the flap is lBR <lFR. It is in. As a result, the elasticity of the rear waist is increased to prevent excessive pressure on the front waist, that is, the abdomen, and as described above, the diaper is easily worn by the user. Further, as shown in FIG. 3, a plurality of heat-shrinkable elastic bands may be provided in parallel per one flap portion.
In this case, they may be adjacent or separated, and the degree of expansion and contraction may be changed.

Further, the length IB of the elastic band 6A is preferably about the same as the width 1 of the absorber 3 in order to give an appropriate contraction force, and sometimes 70 to 130% of the width 1B. About 2/3 of the width of the body 3 is preferable. Furthermore, with regard to the tension (elastic strength) of the elastic bands 6A and 6B, by reducing the elastic band 6B, the pressure on the abdomen of the wearer is reduced,
It is desirable to prevent excessive shrinkage in the region where the elastic band 6B of the flap portion exists, and to reduce the amount of stretching operation of the flap portion when the disposable diaper is attached.

Further, it is desirable that the width of the elastic bands 6A and 6B is 20 to 150% of the width of the flap portion (width in the longitudinal direction of the paper diaper).

Examples of the heat-shrinkable zone include, for example, JP-A-60-1555783.
No. 3,028,098, specifically, "KER-2" manufactured by 3M Company.
207 "can be used. The elasticity of this elastic band is 110 ~ 250
%, Particularly preferably 150 to 200%. Elastic strength is 50-400g,
Particularly, 100 to 200 g is desirable.

As the elastic member in the present invention, in addition to the heat-shrinkable elastic band, a rubber band or the like having ordinary elasticity may be used. As long as the dimensions are uniform, unlike the case of the rubber band, an elastic band having a constant expansion and contraction ratio can always be obtained, which is desirable.

〔The invention's effect〕

As described above, according to the present invention, it is possible to surely prevent the front-rear leakage, to provide a great effect such as to allow the wearer to fit comfortably and to wear the diaper extremely easily.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of the disposable diaper of the present invention, FIG. 2 is a sectional view taken along line II-II, and FIG. 3 is a partially cutaway sectional view of another embodiment. DESCRIPTION OF SYMBOLS 1 ... Top sheet, 2 ... Back sheet, 3 ... Absorber, 5 ... Flap part, 6A, 6B ... Heat-shrinkable elastic band (elastic member), 7 ... Binding tape.

Claims (4)

(57) [Claims] 1. A body fluid absorber is wrapped between a water-permeable top sheet and a water-impermeable back sheet, extends outward from an end of the absorber, and has a flap portion at a position corresponding to a waist and having no absorber. A disposable having at the front waist and the back waist, and having an elastic member fixed along the waist direction of the flaps, and further having a connecting tape that is connected to the front waist when worn on both sides of the rear waist. In the diaper, the length of the elastic member of the front waist is shorter than the length of the elastic member of the rear waist, and each of the distance between the longitudinal end of the elastic member of the front waist and the side edge of the corresponding flap portion is A distance between a longitudinal end of the elastic member at the rear waist portion and a side edge of the corresponding flap portion is longer than each of the distances. 2. The disposable diaper according to claim 1, wherein the elastic member at the front waist has a length equal to or less than the width of the absorber. 3. The width of the elastic member is equal to the width of the flap portion.
2. The disposable diaper according to the above item 1, which accounts for 20 to 150%. 4. The disposable diaper according to claim 1, wherein the elastic member at the front waist has a lower tension when extended than the elastic member at the rear waist.