JP2594946Y2 - Pants-type disposable diapers - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a pants-type disposable diaper.

[0002]

2. Description of the Related Art Conventionally, in this type of diaper, there has been known a diaper in which right and left side edges of a waist of a front and rear body are joined so that top sheets face each other on an inner surface thereof. For example, Japanese Unexamined Patent Publication No. 4-89050 discloses the use of double-sided adhesive tape to the bonding.

[0003]

FIG. 4 is a perspective view of a pants-type diaper 40 in which the front and rear waist side edges of the known diaper are joined in a palm-shape manner. In the diaper 40, a side edge 41 of the front body and a side edge 42 of the back body are joined with an adhesive 43. When the wearer's waist is larger than the diaper's waist size, the diaper 40 has a tension indicated by an arrow A acting in the circumferential direction of the diaper acting as a peeling force.
There is a problem that 1, 42 easily peels off. Although it is possible to use such an adhesive 43 having a high adhesive strength to withstand such a peeling force, various problems occur when the adhesive 43 adheres to a portion other than a portion to be adhered.
For example, sticking to the wearer's skin can be severely painful to peel off.

[0004] Another known diaper for joining the front and rear bodies is to use a tape fastener. When this fastener has a width corresponding to the side edge length of the diaper,
A diaper that when worn can resemble a pants-type diaper. However, it is necessary to fix one end of the fastener to the side edge of one body, and the fixed side edge loses its original flexibility and becomes highly rigid. Therefore, the diaper thus formed has a problem in that the side edges are stiff and the wearing feeling is significantly deteriorated. However, a tape fastener that is usually used does not have such a problem because the width is made smaller than the length of the side edge.

A diaper of the type using a tape fastener (a so-called open type diaper) is capable of adjusting the waist size at the side edges. There is a problem that the side edges are bulky because they are gathered at the part, and the wearing feeling is further deteriorated.

[0006] In this invention, the adhesive on the top sheet at the side edge of the back body is joined to the adhesive on the back sheet at the side edge of the front body, so that the adhesive having a relatively weak adhesive strength is obtained. It is an object to provide a pants-type diaper that can be used. Another problem is to join the side edges without impairing the flexibility.

[0007]

According to the present invention, a diaper body having a liquid-absorbent core interposed between a liquid-permeable topsheet and a liquid-impermeable backsheet is folded inward in the longitudinal direction of the body with the topsheet inward. The present invention relates to an improvement in a pants-type diaper in which a front body and a back body are overlapped, and the right and left waist sides of the front and rear bodies are joined along the longitudinal direction of the main body.

The feature of the invention relating to the improvement is that the width between the side edges of the rear body is formed to be wide so as to extend outward from the left and right side edges of the front body in the overlapping state. On the top surface sheet of the extending side edge of the back body, the outer edge and the upper and lower ends of the side edge are left along the longitudinal direction, and extend over substantially the entire vertical length along the side edge. Only the first pressure-sensitive adhesive applied successively in a strip shape, and the outer edge and the upper and lower ends of the side edge along the longitudinal direction on the back sheet of the side edge of the front body, are attached to the side edge. Almost all along the vertical
The pants type is formed by joining only the second adhesive applied continuously in a strip shape over a long time,
The first pressure-sensitive adhesive on the top sheet is the back sheet.
The vertical and horizontal dimensions larger than the second adhesive on the
There, the first and second pressure-sensitive adhesive is made from the same ingredients together, lies in each of the adhesive force are strongly against the table backsheet than the adhesive strength thereof with each other.

[0009]

In the diaper constructed as described above, the circumferential tension of the waist opening acts as a shearing force on the joint surface of the side edge. Since the peel strength of the joint surface with respect to the shearing force is determined by the size of the joint area, an adhesive having a weak adhesive force can be used by increasing the application area. When joining the side edges, the adhesives are joined to each other, so that it is easy to obtain high peel strength even if the adhesive strength of the adhesive is weak.

[0010] Since the side edge portion is merely coated with the adhesive, it does not lose its flexibility.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pants-type diaper according to the present invention will be described below with reference to the illustrated embodiment.

FIGS. 1 and 2 show a pants-type diaper 1 according to the present invention. FIG. 1 is a perspective view of the diaper 1 in a state of being worn, and FIG. 2 shows the diaper 1 of FIG. The joint of the waist side edge is peeled off, and it is shown in an expanded state. In the diaper 1, a liquid-absorbent core 4 is interposed between the liquid-permeable top sheet 2 and the liquid-impermeable back sheet 3, and the two sheets 2 and 3 are joined to each other on the outer periphery to form a diaper body 5, The body sheet 5 is folded back with the topsheet 2 inward along a line MM that bisects the main body 5 in the longitudinal direction, and the side edge 6
A, 6B and the side edges 7A, 7B of the back body 7 are applied to the respective side edges by the adhesives 10A, 10B and 11A, 1A.
1B, the pants-type shape shown in FIG. 1 is formed.

[0013] For such a configuration, in the main body 5, the front body 6 has a width W ₁ between the side edges, the back body 7 has a width W ₃ between the side edges. Width W ₃ being Yes widely by a width W ₂ than the width W ₁ at its left and right sides, the side edge portion 7A having a width W _2, on the surface sheet 2 in the 7B, pressure sensitive adhesives 11A, 11B is Along the longitudinal direction of the side edge and along the side edge leaving the outer edge and the upper and lower ends of the side edge
It is continuously applied in a strip shape over almost the entire vertical length .
On the back sheet 3 at the side edges 6A, 6B of the front body 6, pressure-sensitive adhesives 10A, 10B composed of the same components as the pressure-sensitive adhesives 11A, 11B are provided along the longitudinal direction of the side edges. And leaving the outer edge and upper and lower ends of the side edge
It is continuously applied in a strip shape over substantially the entire length along the portion . It is preferable that the pressure-sensitive adhesives 11A and 11B on the top sheet 2 are larger in length and width than the pressure-sensitive adhesives 10A and 10B on the back sheet 3. When folding the diaper body 5 along the line M-M in the crotch portion, side edges 7A, the side edges 6A and 7B are front body 6, because extends outwardly by W ₂ from 6B, the side extending Edges 7A, 7B are replaced with side edges 6A, 6B
Wrap along.

FIG. 3 is a view taken in the direction of arrows D--D in FIG. 1 and shows the joined state of the side edges 6A and 7A. The tension A acting in the circumferential direction when the diaper 1 is worn acts as a shearing force substantially parallel to the joint surfaces 12, 13 of the front and rear bodies 6, 7. Adhesive 10A, 1 for constant tension A
When the adhesive force of 1A is weak, for example, the adhesive 10A,
By increasing the application area by increasing the application width B of 11A, the peel strength of the bonding surfaces 12, 13 can be improved.

The pressure-sensitive adhesives 10A, 10B and 11A, 11B have their front and back bodies 6, 7 peeled off once by making each of the pressure-sensitive adhesives to the front and back sheets 2, 3 stronger than their mutual adhesion. Adhesives 10A, 10B, 1
Since 1A and 11B remain on the front and back sheets 2 and 3, respectively, as shown in FIG. 2, they can be joined again in a pants-type. If it is possible to repeat joining and peeling in this way, it is convenient to repeat diaper wearing and to check the dirt condition during wearing by removing the side edges.

In the diaper 1, the front and back sheets 2, 3
Are substantially the same shape and size. Elastic thread rubbers 15 and 16 are provided around the waist and the legs (see FIGS. 1 and 2) so as to have elasticity.

A nonwoven fabric or a perforated plastic sheet is used for the top sheet 2, a plastic sheet is used for the back sheet 3, a mixture of ground pulp and a superabsorbent polymer is used for the absorbent core,
The adhesives 10A, 10B, 11A and 11B are made of ethylene.
A vinyl acetate-based or other adhesive, and a double-sided tape made of such an adhesive can be used.

[0018]

In [devised effect of diaper according to this invention, since the bonding surface formed by a pressure-sensitive adhesive of the waist side edges are set to be parallel to the tension applied in the circumferential direction, the bonding surfaces even during diaper wear, There is no effect of so-called peeling force, and there is no easy peeling. Moreover, the first and second joint surfaces
Since the pressure-sensitive adhesive of No. 2 is applied leaving the outer edges and the upper and lower ends, the cured adhesive does not protrude from the outer edges and the upper and lower ends and does not hurt or irritate the wearer's skin.

The first and second pressure-sensitive adhesives are composed of the same components, and each of the first and second pressure-sensitive adhesives has a higher adhesion to the front and back sheets than their mutual adhesion. Since the first and second pressure-sensitive adhesives remain on the front and back sheets, respectively, they can be joined again in a pants shape.

Since the pressure-sensitive adhesives of the two joining surfaces facing each other are pressure-sensitive and composed of the same components, the two joining surfaces can be joined by only relatively pressing and have good affinity, and the required joining force can be improved. Obtainable.

The first pressure-sensitive adhesive on the top sheet is a back surface
The vertical and horizontal dimensions are larger than the second adhesive on the sheet
The first adhesive and the second adhesive are slightly shifted
To the top sheet without the first adhesive.
If necessary, even if the adhesive
When peeling the mating surface, the topsheet is not damaged
No. By the way, if the topsheet breaks,
Because of the wearer's skin contact surface, part of the core is in direct contact with the skin.
Touching or falling inside the diaper may cause
It gives a sense of harmony.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pants-type diaper according to the present invention.

FIG. 2 is a development view of a diaper.

FIG. 3 is a view as seen from the direction of arrows DD in FIG. 1;

FIG. 4 is a partial perspective view showing an example of a side edge joining method according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pants type diaper 2 Liquid-permeable topsheet 3 Liquid-impermeable backsheet 4 Liquid-absorbent core 5 Main body 6 Front body 7 Rear body 10A, 10B, 11A, 11B Adhesive

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A61F 13/58

Claims (2)

(57) [Scope of request for utility model registration] 1. A diaper main body having a liquid-absorbent core interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet. In a pants-type disposable diaper in which the left and right waist circumference side edges of these front and rear bodies are joined along the longitudinal direction, the width between the side edges of the rear body is the left and right sides of the front body in the superimposed state. wide and formed so as to extend outwardly from the edge, the side edges leaving the outer edges and the upper and lower ends of the side edges along on its longitudinal surface sheet side edges to output the extended of the back body A first adhesive applied continuously in a strip shape over substantially the entire vertical length along the portion, and an outer edge and upper and lower ends of the side edge along the longitudinal direction on the back sheet of the side edge of the front body To almost the entire length along the side edge
Over continuously by joining only the second adhesive agent applied in a band shape Yes formed on the pant, the first pressure-sensitive adhesive on the top sheet, the back surface Sea
Dimension in the vertical and horizontal directions (up, down, left and right) than the second adhesive on the
The Yes Increase, the first and second pressure-sensitive adhesive is made from the same ingredients together, said characterized in that each of the adhesive force are strongly against the table backsheet than the adhesive strength thereof mutually Diapers. 2. The diaper according to claim 1, wherein said first and second adhesives are of the same pressure-sensitive composition.