JPS63196701A - Disposable diaper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disposable diaper having a heat-shrinkable elastic band.

[Conventional technology]

In recent years, attention has been focused on the importance of preventing leakage from the waist area (so-called front and rear leakage) in this type of diaper, and several solutions have been proposed. One typical example of this is as described in Japanese Unexamined Patent Publication No. 61-83368, in which a heat-shrinkable elastic band is provided around the waist of the diaper in place of a normal rubber band.
1st prior art), and JP-A No. 58-87303
The techniques of Japanese Patent No. 60-2153803 (second prior art) and No. 60-2153803 (third prior art) are also known.

[Means for solving problems]

However, in the first prior art described above, only the central part of the wearer's back and abdomen are contracted, and when the contraction force is particularly concentrated in the central part of the abdomen, the wearer's abdomen becomes useless. It gives a feeling of pressure.

In addition, the wearer is usually put on the wearer while lying down, but the elastic band on the back side gets stuck under the wearer and cannot be stretched, so the elastic band only on the stomach side is stretched and worn. Moreover, since there is a limit to the degree of elongation, the shrinkage force is insufficient after wearing, making the diaper easy to shift and causing leakage.

In the second prior art, the elastic band along with the binding tape runs the entire length around the waist, which often places excessive pressure on the wearer, and when not in use, the flap part stretches the entire length around the waist. Since the product shrinks, especially the left and right portions of the flap part, the packaging of the product is poor and the ease of mounting is extremely poor.

Furthermore, in the third prior art, the left and right binding tapes tend to be worn at different degrees of elongation, which often gives the wearer a sense of discomfort (because the contraction forces are different between the left and right sides). Fitting the waist using only elastic stretching force has a limit in contractile force, and as a result, the diaper is likely to shift and leak.

SUMMARY OF THE INVENTION Therefore, the main object of the present invention is to provide a disposable disposable diaper that fits the wearer with appropriate shrinkage force, has good packaging form, and is easy to wear.

[Means to solve problems]

The above purpose is to have a body fluid absorbent wrapped between a water-permeable top sheet and a water-impermeable back sheet, and a flap part that extends outward from the edge of the absorber and is located at a position corresponding to the waist region and has no absorber. In the disposable diaper; an elastic band is fixed to the flap portion along the waist circumference direction;
This is achieved by forming the connection piece of the binding tape that connects the front and rear waist regions when the diaper is put on from an elastic stretchable member, and making it elastic in the direction around the waist with the elastic band and another elastic connection piece. .

[For production]

In the present invention, due to the presence of the elastic band in the flap around the waist, the flap always comes into close contact with the skin when worn, regardless of the movement of the wearer, so urine does not leak from the gap. .

Furthermore, if an attempt is made to fit the wearer using only the elastic band, the contraction force will be distributed to both sides of the waist, but if a strong elastic band is used, excessive compressive force will be applied to the waist. However, in the present invention, the binding tape also has elasticity and stretchability, so that the contractile force is applied to the entire waist area. This allows the paper diaper to fit around the waist with appropriate shrinkage force.

On the other hand, in the present invention, elasticity is achieved not only by making the binding tape elastic, but also by providing an elastic band at the waist.
At the time of attachment, there is no need to excessively stretch the binding tape and attach it to the ventral side, so the attachment operation is effortless and easy, and imbalances in left and right elastic forces are less likely to occur.

Moreover, when trying to apply contraction force to the entire waist area, if elasticity is applied to the entire middle of the flap part and the connecting tape,
This causes the paper diaper to lose its shape, making the process from attaching the elastic material to folding and packaging difficult, and damaging the packaging form of the product.According to the present invention, preferably, the elastic band has a width approximately equal to the width of the absorbent material. If the absorbent body has a certain degree of rigidity, it is possible to prevent the flap portion from shrinking and deforming to an appropriate degree, and the above-mentioned drawbacks can be solved.

[Specific Configuration of the Invention] The present invention will be further explained in detail below with reference to specific examples shown in the drawings.

Figures 1 to 3 show a first embodiment of a disposable diaper, which consists of a top sheet 1 made of a water-permeable material such as non-woven fabric and a back sheet 2 made of a non-water-permeable material such as polyethylene. It has a basic structure in which an absorbent body 3 mainly made of cotton-like pulp is wrapped in between, leaving the surrounding area.

Elastic stretchable members 4 made of rubber or the like are provided on both sides of the diaper along the longitudinal direction (vertical direction in FIG. 1). Also,
Absence of absorbent body 3 at the longitudinal end of the diaper a
Heat-shrinkable elastic bands 6B and 6A are provided at the front and rear of the (flap portion) 5 along the width direction of the diaper (left-right direction in FIG. 1). In this first embodiment, it is interposed between a top sheet 1 and a back sheet 2. The heat-shrinkable elastic bands 6A and 6B, which expand and contract in the direction around the waist, are fixed to at least one of the sheets 1 and 2 in an unshrinked state, and are later contracted by receiving heat, thereby causing the flap portion to contract. moreover,
In order to prevent body fluids absorbed into the absorbent body 3 from leaking from both ends in the longitudinal direction, a hydrophobic hot melt thin film 7 as a hydrophobic thin film is attached to the top sheet 1 and the elastic bands 6A, 6B from the ends of the absorbent body 3. It is set up astride between. As this hot melt thin film 7, it is also possible to use a water-impermeable hydrophobic plastic film.

T is the bonding tape. As shown in FIG. 3, this binding tape 8 has an elastic connecting piece 10 whose base is fixed to the back sheet 2 via, for example, a photoluminescent material.
It is made of a non-elastic (shrinkable) material such as a plastic film, which reinforces the fixation to the back sheet 2 and causes the fixed part to lose its elasticity, and is straddled between the connecting piece 10 and the bank sheet 2 using hot melt H. Fixed reinforcing piece ll; non-elastic (shrinkable) non-elastic piece 12 having an adhesive layer 12a and fixed to the tip of the connecting piece 10 via hot melt: TOFUPSHI! Peeling tape 13 attached to sheet 1 via Honmelt H; Intermediate tape 14 having adhesive layer 14a;
It has

The basic layer configuration itself with this binding tape T is known to those skilled in the art as a two-layer tape, but the connecting piece 10 of the binding tape of the present invention is conventionally made of paper or plastic film, and -i It differs in that it is made of an elastic material such as rubber, whereas it does not have elasticity. In addition, in conventional tapes, an adhesive layer is formed at the tip of the connecting piece 10, and this layer is releasably superimposed on the surface of the intermediate tape 14, but the connecting tape T of the present invention
This differs also in that a non-elastic piece 12 having no elasticity (contractability) is interposed.

When the bonding tape T is not in use, the inelastic piece 12 is superimposed on the intermediate tape 14, and when in use, the inelastic piece 12 is superimposed on the intermediate tape 14.
4 and the release tape 13, and is adhered to the front surface of the paper diaper.
This is done by peeling off the intermediate tape 14.

Further, this bonding tape T exhibits elastic contractility only in the length region Z. The elasticity of the elastic connecting piece is 1000 g
It is preferable that the degree of elongation is 30 to 500% and the length is 5 to 7011 when a force of 1 is applied.

As the heat-shrinkable elastic band in the present invention, for example, the one shown in JP-A-60-155783, specifically,
rKER-2207J manufactured by 3M Company can be used. ilW of the hot melt thin film 7 is the distance W from the edge of the absorber 3 to the end of the flap part.

20 to 100% is good, but about 150%, that is,
It may be made to extend even onto the surface of the absorber 3.
The length lI may be arbitrary, but it is better to be equal to or longer than the width of the absorbent body 3 in order to ensure prevention of leakage from front to back.

The elastic band has a stretching ratio of 110 to 250%, especially 150 to 2
00% is preferable 0 Elastic strength (tightening force) is 50~
400 g, especially 100-200 g is desirable.

From the viewpoint of aesthetics, it is preferable to color the Honmelt thin film or elastic band in blue, green, or the like in advance. The entire top sheet 1 of the paper diaper may be colored, and the cross-sectional shape of the elastic band may be arbitrary, but it is generally good to have a rectangular cross-section.

The shape, elasticity, etc. of the elastic band can be changed between the back side and the ventral side. For example, the degree of stretch on the back side may be increased. In the illustrated example, the elastic band 6A on the back side
By making it longer than that on the ventral side 6B, it increases elasticity and prevents excessive pressure on the abdomen. The elastic band is
A plurality of them may be provided in parallel for one flap detection.

In this case, they may be adjacent or spaced apart.

The degree of expansion and contraction may be changed.

In addition, the length β of the elastic band is 10/4 or more, and is preferably thicker than the width 12 of the absorber 3. If it is long, excessive This is because it applies shrinkage force and causes the diaper to lose its shape.Even if it is long, it is best to fasten it so that it extends laterally within 1.5 cm from the side edge of the absorbent body 3.

In addition to heat-shrinkable elastic bands, the elastic band may be a normal rubber band that is always elastic, but heat-shrinkable elastic bands can be used as long as the length dimensions before shrinking are the same. , unlike the case of rubber bands, it is possible to obtain an elastic band with a constant expansion and contraction rate, which is desirable.

By the way, as in the above example, it is preferable to use a thin film formed by applying hot melt adhesive as the hydrophobic thin film; the melting temperature at the time of application should be higher than the temperature at which the elastic band begins to expand and contract. desired. Japanese Patent Publication No. 61-833
In Japanese Patent No. 68, after the paper diaper is folded to heat shrink the elastic band, hot air is applied from the end of the paper diaper. However, since the disposable diaper is folded, the hot air does not shine on the elastic band sufficiently, resulting in insufficient heat shrinkability or lack of chemotaxis.

However, when using a true melt thin film, when applying it,
The heat-shrinkable band can be sufficiently shrunk by the heat of fusion of the hot melt, which is preferable.

It is also a good method to heat-shrink the elastic band using the heat of the hot melt, or after that, to completely smooth out the shrinkage using heat rolls or hot air.

The basis weight of the hydrophobic thin film is preferably 5 to 100 g/m'', particularly 1O to 50 g/m''. If the basis weight is too large, the texture and elasticity of the elastic band will be impaired, and if it is too small, the effect of preventing front and rear leakage will be small.

When forming a hot melt thin film, for example, Nitta Gelatin Co., Ltd.'s rH6285J and rHB Fuller, Malcolm Nicol Co., Ltd.'s Nicomelt ACH-IJ, etc. can be used.

When using a synthetic resin film such as polyethylene, polypropylene, polyester, or nylon as the hydrophobic thin film, it is necessary to use a true melt adhesive to fix it to the top sheet or back sheet.

FIG. 4 shows a second embodiment. In this example, the position of the elastic band 6A is determined in the longitudinal direction of the disposable diaper from the center side line 6a of the elastic band 6A to the line CL connecting the binding tapes T. The edges are offset. Preferably, the side line 6a is also the same as or offset from the side line of the binding tape T.

As a result, when the diaper is worn, the flap portions 4 curve inward toward the wearer's skin, improving not only the appearance but also the fit.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reliably prevent leakage from the front to the rear, and it is possible to provide a fit to the wearer with appropriate shrinkage force.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of the disposable disposable diaper of the present invention;
FIG. 2 is a cross-sectional view taken along the line ■-■, FIG. 3 is a cross-sectional view taken along the line ■-■, and FIG. 4 is a partially cutaway plan view of another example. 1...Top sheet, 2...Back sheet, 3...
・Absorber, 5...Edge (flap part), '6A, 6B・
...Heat-shrinkable elastic band, 7...Hot melt thin film, 10
...Elastic connecting piece, T...binding tape.

Claims (5)

[Claims] (1) A body fluid absorbent is wrapped between a water permeable top sheet and an impermeable back sheet, and extends outward from the edge of the absorber.
In a disposable diaper having a flap part located at a position corresponding to the waist region and without an absorbent body; an elastic band is fixed to the flap part along the direction around the waist,
The connecting piece of the binding tape that connects the front and rear waist regions when the diaper is worn is formed of an elastic stretchable member, and is made elastic in the direction around the waist by the elastic band and another elastic connecting piece. disposable diapers. (2) The disposable diaper according to item 1, wherein the contraction force of the elastic connecting piece is greater than the contraction force of the elastic band. (3) When the elastic connecting piece is subjected to a force of 1000g, the degree of elongation is 30 to 500%, and the length is 5 to 70 mm.
The disposable diaper according to item 1 or item 2. (4) The disposable diaper according to item 1 or 2, wherein the elastic band has a tightening force of 50 to 450 g and an elongation of 150 to 200%. (5) The disposable diaper according to item 1, wherein the attachment position of the elastic band is deviated toward the edge of the diaper from the line connecting the binding tapes on both sides.