JP2003265523A - Disposable paper diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve an overall fitting property, and at the same time, to prevent urine from leaking out without applying an excessive pressure. <P>SOLUTION: An absorber element 10 including a liquid-permeable top sheet 1, a liquid-impermeable back sheet 2 and an absorber 3 is arranged on a main body back sheet 20 for this paper diaper. In such a paper diaper, both of front and rear end sections of the absorber element 10 are bonded on the main body back sheet 20 corresponding to these areas. Also, the absorber element 10 is bonded to the main body back sheet 20 in the width direction at an intermediate section in the longitudinal direction. Sections other than these bonded sections 30A and 30C are made to be free sections. Then, the main body back sheet 20 is made of a material which shows elastic stretchability at least in the longitudinal direction. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper, and particularly preferably to a pants-type diaper such as so-called training pants.

[0002]

2. Description of the Prior Art Disposable disposable diapers, especially training pants, are used to promote separation of disposable diapers during the transition from an infant to an infant.

Various proposals have been made and some of these pants-type disposable diapers are commercially available. Typical examples thereof include Patent Document 1, Patent Document 2, and Patent Document 3.

The device disclosed in Patent Document 1 is provided with an elastic stretchable sheet on the side (side) of the waist. An absorber element is provided in the central portion in the width direction, and elastic stretchable members are provided around the legs and waist respectively.

As shown in FIG. 6, in the device disclosed in Patent Document 3, an absorbent body 53 is provided between a liquid-permeable top sheet 51 and a liquid-impermeable back sheet 52, and an absorbent body 53 is provided around the waist. Elastic member 54 and leg elastic members 55, 5 over the entire length
5 is provided. The leg-surrounding elastic members 55, 55 are arranged in a dish shape with a collar while intersecting with each other in an upside down direction in a plan view. In addition, as a preferable embodiment of the liquid-impermeable back sheet, page 8 line 10 to page 9 4 of the same specification is used.
As described in the row, the nonwoven fabric and the thermoplastic elastomer having elastic stretchability are joined, but the elastic stretchability is hindered by the joining, and the elastic stretchability as in the present invention described below is exhibited. There is no such thing. Further, the thermoplastic elastomer does not show air permeability. By the way, even the pants type “Moonie Man” (trade name) marketed by the same applicant corresponding to the same application does not substantially exhibit elastic stretchability. Even if it is shown, since it is based on the spunlace method in which the heat-crimped thermoplastic fiber is entangled under a high-pressure water flow, the elastic expansion and contraction degree is at most 50 to 10.
It is about 0%.

[0006]

[Patent Document 1] Japanese Patent Laid-Open No. 2-4326

[Patent Document 2] Japanese Patent Laid-Open No. 4-226658

[Patent Document 3] Japanese Utility Model Publication No. 4-44920

[0007]

However, even if a paper diaper is made up of a liquid-permeable top sheet and a liquid-impermeable back sheet having the elasticity and elasticity as shown in Patent Document 3, the legs and waist are exclusively surrounded. Since the elastic stretchable member prevents lateral leakage and front-back leakage, it is not substantially effective in improving fit.

Further, in the one disclosed in Patent Document 1,
The elastic stretchable sheet on the side of the waist secures the elastic stretchability around the waist, but since the elastic stretchability is not exhibited in the other portions, the effective fit has not been improved.

Therefore, the main object of the present invention is to improve the overall fit. Another problem is to prevent leakage of urine without applying undue pressure.

[0010]

Means for Solving the Problems The above-mentioned problem is a paper diaper in which an absorber element including a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorber is arranged on a main body backsheet. Both front and rear end portions of are joined on the main body backsheet corresponding to this portion, and the absorber element is joined to the main body backsheet along the width direction at the front-rear direction intermediate portion, and portions other than these joint portions are This can be solved by using a material that is not joined and is a free portion, and the main body backsheet is made of a material that exhibits elastic stretchability at least in the front-rear direction.

Further, in a disposable diaper in which an absorbent element including a liquid-permeable top sheet, a liquid-impermeable back sheet and an absorber is arranged on a main body back sheet, both front and rear end portions of the absorbent element are located at this portion. The absorber element is joined on the corresponding main body backsheet, and the absorber element is joined to the main body backsheet in the front-rear direction at the central portion, but the intermediate portions on both sides are not joined, and other than these joined portions. It is also possible to solve the problem by making the portion of the body a free portion without being joined, and the main body backsheet is made of a material exhibiting elastic stretchability at least in the width direction.

(Function and Effect) In the present invention, in a disposable diaper in which an absorbent body element including a liquid-permeable top sheet, a liquid-impermeable back sheet and an absorbent body is arranged on a main body back sheet, the absorbent body element Both front and rear end portions are joined on the main body backsheet corresponding to this portion, and the absorber element is joined to the main body backsheet along the width direction at the front-rear intermediate portion, and the portions other than these joined portions are joined. Is not a free portion, since the main body backsheet is made of a material exhibiting elastic stretchability in at least the front-back direction, when the diaper is worn, the entire main body backsheet is tightened against the wearer, It will always fit, even if the wearer is active.

In this respect, in each of the above-mentioned conventional examples, even if it has elastic stretchability, it is not sufficient, or since only the side part shows elastic stretchability only partially, such an effect cannot be obtained. is there.

At least one of a leg elastic member and a waist elastic member may be provided on the main body back sheet or the absorbent element having high elasticity. In the conventional example, the elastic member around the leg and the elastic member around the waist are required to have a certain degree of elastic expansion and contraction in view of the idea that these members alone prevent leakage. But,
In this case, there is a large difference in the degree of tightening with respect to the other parts, giving an excessive feeling of pressure.

On the other hand, according to the embodiment of the present invention, the elastic elasticity of the back sheet of the main body and the elastic elasticity of the elastic member around the leg or the elastic member around the waist are added, so that the elastic member around the leg or the waist is elastic. It is sufficient that the peripheral elastic member has a small elastic expansion / contraction degree, and the difference in elastic expansion / contraction degree between the disposition part and other parts is small, so that excessive compression can be prevented. Moreover, by tightening with the back sheet of the main body,
Since the lateral and anterior-posterior diffusion of urine is suppressed, the amount reaching the leg part and the waist part is reduced, and as a result, the elastic elasticity of the leg elastic member or waist elastic member is small. There are also advantages.

[0016] On the other hand, the absorber element may be a free portion in which only the front and rear end portions and the intermediate portions of both side portions are joined to the main body backsheet, and the other portions are not joined. In this case, the free portion stretches well according to the wearer's wearing manner and movement, and gives a good fit.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments. (First Embodiment) FIGS. 1 and 2 show a first embodiment of the present invention, in which a liquid-permeable top sheet 1 made of a non-woven fabric and a liquid-impermeable back sheet 2 made of a polyethylene sheet or the like are shown. The absorber element 1 having a structure in which the absorber 3 is wrapped by
0 is provided on the main body backsheet 20.

In the absorbent element 10, the side flap portion formed by the liquid-permeable top sheet 1 and the liquid-impermeable back sheet 2 outside the side edges of the absorbent body 3 has a rubber thread or the like between them. One or a plurality of elastic elastic members 4 around the legs made of, and waist elastic elastic members 5 made of urethane foam or the like are provided between them at the front and rear flap portions outside the front and rear end edges of the absorber 3. Has been.

The absorbent element 10 is preferably provided with side barrier cuffs 6 and front and rear barrier cuffs 7 as shown. These barrier cuffs 6 and 7 are preferably made of a liquid-impermeable or water-repellent sheet.
The side barrier cuffs 6 can be fixed to the liquid-permeable top sheet 1 so as to stand upright at the side flaps or from the position of the side surface of the absorbent body 3. An elastic elastic member 8 for barrier cuffs made of rubber thread or the like is fixed to the free portion (standing portion) of the side barrier cuffs 6 under its extension so that the side barrier cuffs 6 stand up in use. The front-rear direction end portions of the front-rear barrier cuffs 7 can be fixed to the liquid-permeable top sheet 1 so as to stand upright at the front-rear flap portions or from the upper surface positions of the front-rear end portions of the absorbent body 3. Further, the widthwise end portions of the front and rear barrier cuffs 7 are superposed below or above the side barrier cuffs 6 and fixed to the inner surface or the outer surface of the end portions of the side barrier cuffs 6 and 6, respectively. When 6 and 6 stand up, the non-fixed part stands up at the same time. If necessary,
Elastic stretchability can be imparted by providing elastic stretchable members along the free standing ends of the front and rear barrier cuffs 7 or by forming the elastic cuffs 7 themselves from a material having elasticity.

In the absorbent element 10, the side barrier cuffs 6 and the front and rear barrier cuffs 7 can be omitted if necessary. It is optimal to provide the elastic stretchable members 4 and 5, but this may be omitted.

The absorbent element 10 comprises a body backsheet 20.
Fixed against. The main body backsheet 20 is wider than at least the absorbent element 10 in the width direction,
The absorber element 10 is provided on the main body backsheet 20 in the widthwise middle.
Are joined.

The main body backsheet 20 is a continuous sheet that defines the overall shape over the entire outer surface of the final product, is made of a material that exhibits elastic stretchability in at least one of the front-rear direction and the width direction, and its elastic stretchability. Is 150% or more. The main body backsheet 20 in the embodiment is formed in an hourglass shape.

In the manufacturing process of the product, for example, in a state where the absorber element 10 is assembled in advance, it is bonded to the main body backsheet 20 entirely or preferably intermittently by a hot melt adhesive or the like. After that, the main body backsheet 20 is folded back and forth in the side direction 20A,
The 20A are joined together by heat welding or a hot melt adhesive to assemble a pants-type disposable diaper.

The most important characteristic of the disposable diaper is the fit property. However, an absorbent element is required because high absorption of urine is also required. This absorber element acts to retain its shape in order to exhibit semi-rigidity.

However, in the disposable diaper according to the present invention, the main body backsheet 20 exhibits elastic elasticity. Therefore, when the diaper is worn, the entire body backsheet 20 is tightened against the wearer, and the absorbent element 10 separates from the skin even if the wearer's movement is active with this. Will always fit without.

Further, the elastic expansion and contraction of the main body backsheet 20 itself acts on the portion other than the joining region of the absorber element 10, that is, on the side portion in the embodiment, the degree of expansion and contraction is large.

(Second Embodiment) FIG. 3 shows a second embodiment, in which the absorber element 10 is arranged over substantially the entire length of the main body backsheet 20 in the front-rear direction. Only the both ends 30A, 30A and the intermediate portions 30B, 30B on both sides are provided with the main body backsheet 20.
Is joined with a hot melt adhesive or the like, and the other portions are not joined and are used as free portions 31. Under such an aspect, when the main body backsheet 20 has elastic stretchability in the front-back and width directions, when the diaper is assembled,
As indicated by the white arrow in FIG. 4, the semi-rigid absorber element 1
Even in the 0 area, the main body backsheet 20 expands and contracts in the front-rear direction and in the width direction, so that a more suitable fit is exhibited.

As a modification of this embodiment, as shown by phantom lines and hatching, the absorber element 10 can be joined to the main body backsheet 20 as a fixing portion 30C in the front-rear direction at the central portion. This modification shows excellent stretchability when the main body backsheet 20 has stretchability in the width direction. When the main body backsheet 20 is stretchable in the front-rear direction, the intermediate portions 30B, 30B on both sides and only the width-direction end portions of the front-rear end portions 30A, 30A can be joined together. Further, as shown as the fixing portion 30D, it is also possible to fix along the width direction at the front-rear direction intermediate portion, and to fix only this fixing portion 30D and both front and rear end portions 30A, 30A.

Generally, since the stretchability in the width direction is more important, it is effective to fix only the front and rear end portions 30A, 30A and the fixing portion 30C (that is, the intermediate portions 30B, 30B are not provided). is there.

(Third Embodiment) In each of the above examples, the waist elastic elastic member and the leg elastic elastic member are provided in the absorbent element 10, but as shown in FIG.
Apart from this, a leg elastic elastic member 4A and a waist elastic elastic member 5A can be provided. As shown in the figure, the leg elastic elastic members 4A can be arranged along the leg cut of the main body backsheet 20 or can be linearly arranged in the front-rear direction.

By the way, when the elastic elastic members 4A around the leg and the elastic elastic member 5A around the waist are exposed at the inner surface (use surface) of the crocodile, the touch to the skin is deteriorated, and these parts can be covered with a non-woven fabric or the like. . Further, as shown in the figure, the entire diaper can be covered with the liquid-permeable cover sheet 40. The liquid permeable cover sheet 40 in this case follows the main body back sheet 20,
It is necessary that the material exhibits elastic stretchability in the same direction.

Further, the absorbent element may be provided with barrier cuffs, and as a mode thereof, as shown on the right side of the figure, the barrier cuff has substantially the same shape as that of the absorbent body 3 in the absorbent element 10A. 6A is provided, and as shown on the left side of the figure, the liquid-permeable top sheet 1 is provided in substantially the same shape as the absorbent body 3, and the barrier cuffs 6B are extended to the main body backsheet 20 to be substantially the same. The shapes can be the same. In the case of the latter barrier cuff 6B, it is necessary that the barrier cuff 6B has elastic stretchability at least in a portion where it is joined to the main body backsheet 20.
A sheet having elastic elasticity can be used as the sheet forming the. Further, although the sheet itself does not substantially have elastic elasticity, it is intermittently joined to the main body backsheet 20, for example, in a scattered manner, or is joined in stripes in the front-rear direction at intervals in the width direction. At least the non-joint portion in the width direction can be formed so as to be stretchable in the width direction.

(Other Examples) The main body backsheet 20 in the present invention is sufficient if it is made of a material exhibiting elastic stretchability in at least one of the front-rear direction and the width direction,
Of course, it is possible to adopt a mode in which elastic stretchability is exhibited in both directions. Since it is easy to give elastic stretchability only in one direction in the production of the material, it is usually preferable to give directionality so as to exhibit elastic stretchability in the width direction.

When the elastic stretchable member is provided, it is preferably arranged around the legs or the waist along a direction other than the elastic stretch direction of the main body backsheet. Of course, it is also possible to arrange them around the legs or the waist in a state of being added along the elastic expansion / contraction direction.

Elasticity of the back sheet of the main body is 150%
That is all. That is, when the initial length is L,
It is necessary to extend it to 2.5 L or more. The inventor has found that if the elastic expansion / contraction degree is smaller than this value, the effect of overcoming the semi-rigidity of the absorber 3 and enhancing the fitting property is not sufficient. Also, 100% elongation stress is 200-700 g /
50mm width, especially 200-500g / 50mm width is 150
% Elongation stress is 300-1800g / 50mm width, especially 30
A width of 0 to 600 g / 50 mm is preferable. Furthermore, 100% recovery stress is 100-500g / 50mm width, especially 100-3
A width of 00 g / 50 mm is suitable.

From the viewpoint of preventing stuffiness, the back sheet of the main body has at least one of breathability and waterproofness (water repellency),
More preferably, it is desired to have both properties. The material can be appropriately selected, but as an example, a rayon spunlace non-woven fabric in which polypropylene-based heat-sealing fibers and rayon fibers are mixed, and a melt-blown non-woven fabric mainly composed of urethane or isoprene rubber-based material are heat-sealed, An example is one in which the former non-woven fabric is used on the skin side of the wearer by integrating them by ultrasonic bonding, bonding with a hot melt adhesive, or the like.

[0037]

As described above, according to the present invention, it is possible to improve the overall fit, and it is possible to prevent urine from leaking without applying excessive pressure. Be brought.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts of a disposable diaper according to a first embodiment of the present invention before final assembly.

FIG. 2 is an enlarged perspective view of a main part of the absorber element.

FIG. 3 is a plan view of the second embodiment.

FIG. 4 is a perspective view of the assembled state.

FIG. 5 is a plan view of the third embodiment.

FIG. 6 is an exploded perspective view of a conventional example.

[Explanation of symbols]

1 ... Liquid-permeable top sheet, 2 ... Liquid-impermeable back sheet,
3 ... Absorber, 4, 4A ... Leg elastic elastic members, 5, 5A
... waist elastic elastic member, 6 ... side barrier cuffs, 7
... Front and rear barrier cuffs, 10, 10A ... Absorber element, 2
0 ... Main back sheet.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) A61F 13/539 A61F 13/18 333

Claims (2)

[Claims] 1. A paper diaper in which an absorbent element including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber is arranged on a main body back sheet, and both front and rear ends of the absorbent element are located at this portion. Joined on the corresponding main body backsheet, and the absorber element is joined to the main body backsheet along the width direction at the front-rear direction intermediate portion, and the portions other than these joined portions are not joined and are free portions, The main body backsheet is made of a material exhibiting elastic stretchability at least in the front-rear direction. 2. A paper diaper in which an absorbent element including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber is arranged on a main body back sheet, and both front and rear ends of the absorbent element are located at this portion. The absorber element is joined on the corresponding main body backsheet, and the absorber element is joined to the main body backsheet in the front-rear direction at the central portion, but the intermediate portions on both sides are not joined, and other than these joined portions. Is a free part without being joined, and the main body backsheet is made of a material exhibiting elastic stretchability at least in the width direction.