JPH1081U - Disposable pants-type diapers - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To facilitate the tearing of the disposable pants-type diaper in the vertical direction on the side around the waist. SOLUTION: In a disposable pants-type diaper in which front and rear bodies are joined by a welding portion 10 at a waist side, a welding portion 10 is formed in a diamond shape.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 This invention relates to a disposable pants-type diaper.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, in a disposable pants-type diaper made of a heat-weldable sheet material, a technique of sealing the front and rear bodies by heat welding at left and right waist circumference sides is known. For example, Japanese Unexamined Patent Application Publication No. HEI 5-15551 filed by the present applicant discloses that a rectangular welded portion having a long side in the circumferential direction is formed on the waist side of a pants-type diaper using ultrasonic technology. A technique of intermittently arranging and sealing in a row is disclosed. Using this technique, the diaper worn can be easily removed by tearing the sealed side. Further, between the welded portions intermittently arranged, that is, between the non-welded portions, the inside and outside of the diaper communicate with each other, and a diaper having good air permeability can be obtained.

[0003]

[Problems to be solved by the invention]

 When the diaper is torn, the sheet material on the front and back surfaces tends to tear at the periphery of the welded portion. Normally used sheet materials are thin non-woven fabrics and plastic films with a small basis weight, which have relatively low tear strength, and when the sheet materials are welded together, the strength of the welded parts becomes relatively high. This is because the tearing force is concentrated on the boundary between the non-welded portion and the welded portion. For this reason, in this diaper, when the sheet tears along the long side of the rectangle located in the waist direction, the tears continue to move in the waist direction, that is, in the lateral direction, and tear to the front or back body. May not tear in the direction. There is a difference in the tear strength between the front and back sheets in the vertical and horizontal directions. Unless the diaper is torn in the vertical direction, it will not be possible to quickly remove it by tearing the side around the waist, causing a problem that the intended purpose cannot be achieved.

[0004] In this invention, it is an object to solve the above problem by making the diaper easily tear in a diagonally downward direction.

[0005]

[Means for Solving the Problems]

 The present invention is as follows to solve the above problems.

In this invention, a liquid-absorbent core is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, each of which is heat-weldable, and extends laterally from a side edge of the core. The front and back bodies are joined together by overlapping the front and back sheets on the waist side and sealing them with a welded portion located along the longitudinal direction, thereby forming a waist opening and a leg opening. And a disposable pants-type diaper to which a plurality of waist and leg elastic members are attached in parallel with each other in the direction around the openings.

In one embodiment of the present invention based on the above premise, at least the welded portions between the waist elastic member and the leg elastic members are separated from each other in the longitudinal direction of the diaper, and The diaper is substantially rhomboid with a pair of corners substantially facing in the vertical and horizontal directions.

[0008] In another configuration of the present invention based on the above premise, the welding portion is provided between the waist elastic members and in the vicinity thereof, and has a long side parallel to the waist elastic members. Interposed intermittently between the first welding pattern and the adjacent elastic members around the legs, and the long sides are parallel to the elastic members around the legs. A second welding pattern having a rectangular shape and the waist circumference and each leg circumference are disposed between the elastic members, and are spaced apart from each other in the vertical direction of the diaper and substantially opposed in the vertical and horizontal directions of the diaper. It is characterized by comprising a pair of substantially diamond-shaped third welding patterns whose corners face.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the disposable pants-type diaper according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a disposable pants-type diaper 1 in a worn state.

FIG. 2 is a perspective view of the diaper main body 1A obtained by expanding the diaper 1 of FIG. 1 in the front-rear direction.

1 and 2, a diaper 1 and a main body 1A are composed of a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a liquid-absorbent core 4 interposed between the sheets 2 and 3. It has a front body 5, a back body 6, and a crotch 7. The top sheet 2 is a non-woven fabric made of thermoplastic fiber, the back sheet 3 is a thermoplastic film, and the two sheets 2 and 3 can be thermally welded to each other. 2, in the main body 1A, the front and back sheets 2, 3 extend from the periphery of the core 4, and the extending portions are intermittently joined to each other by an adhesive (not shown). The main body 1A is bent inward along a center line XX that bisects its longitudinal direction, and extends from the side edge of the core 4 to overlap the front and back surfaces of the front and rear bodies 5, 6 formed by the sheets 2, 3. Pants-type diaper 1 can be obtained by providing and sealing welding portions 10 arranged side by side at the side edges. The diaper 1 has a waist opening 11 and a pair of left and right leg openings 12. A plurality of elastic members 13, 14 parallel to each other are attached to the periphery of each opening 11, 12 in an extended state. .

FIG. 3 is an enlarged view of the waist circumference of the diaper 1 showing details of the welding portion 10. Above this side is a waist elastic member 13 and below is a leg elastic member 14. The welding portion 10 includes a first welding pattern 17 that is intermittently disposed between the waist elastic members 13 and in the vicinity thereof, and has a long side 17 </ b> A parallel to the member 13. A second welding pattern 18, which is intermittently arranged between the members 14 and in the vicinity thereof, and has a long side 18A parallel to the member 14, and is intermittently arranged between the members 13 and 14. The third welding pattern 19 has a rhombus shape which is separated from each other in the vertical direction of the diaper and has substantially a pair of corners in the vertical and horizontal directions of the diaper. Each of the welding patterns 17, 18, and 19 has a separation distance d of 0.5 to 3 mm. In a non-welding area between the patterns, the diaper 1 communicates with the inside and outside, and has air permeability.

The diaper 1 of FIG. 1 can be split vertically from top to bottom along the welded portion 10 by pulling each of the front and rear bodies 5 and 6 in the directions of arrows A and B at the waist opening 11. It can be easily removed. Since the welded portion 10 of the diaper 1 generally has a higher tear strength than the front and back sheets 2 and 3, when pulled in the A and B directions, the front and back sheets 2 and 3 have the first, second and third welding patterns 17, 18, and Tears around the periphery of 19. Therefore, in the first and second welding patterns 17 and 18, the front and back sheets 2 and 3 are easily torn in the lateral direction, and in the third welding pattern 19, the sheets are almost rhombic and connected to each other as a whole. Is easily torn in a zigzag downward direction. In particular, when the fibers and polymers of the top sheet 2 and the back sheet 3 are oriented in the lateral direction of the diaper 1 and are easily ruptured in the lateral direction, when the tears along the first and second welding patterns 17 and 18, There is a risk of tearing back and forth. However, in this diaper 1, the first and second welding patterns 17, 18 are arranged only around the waist and around the elastic members 13, 14 around the legs, and the danger is minimized. Most parts are sealed with the third welding pattern 19 so that the front and back sheets 2 and 3 are easily torn in the vertical direction and are not easily torn in the horizontal direction. Although the first and second welding patterns 17 and 18 in the diaper 1 can be replaced with the third welding pattern 19, if the interval between the elastic members 13 and 14 is small, the substantially diamond-shaped welding pattern 19 becomes elastic. The members 13 and 14 may intersect with the members 13 and 14 and may be cut, or the elastic members 13 and 14 may hinder rapid welding of the front and back sheets 2 and 3.

In this invention, in order to obtain the first, second and third welding patterns 17, 18 and 19, the front and back sheets 2 and 3 which are heat weldable may be subjected to hot embossing or ultrasonic welding. For the top sheet 2, a thermoplastic film having openings may be used in addition to the non-woven fabric made of thermoplastic fibers. For the back sheet 3, in addition to the thermoplastic plastic film, a non-woven fabric or a non-woven fabric may be used. Laminated film products can be used. The liquid-absorbent core 4 may be made of a material commonly used in this field.

[0016]

[Effect of the invention]

 In the disposable pants-type diaper according to the present invention, the front and rear bodies are welded on the waist side, and the welding is performed by a welding part having a substantially rhombic shape. Therefore, when the worn diaper can be removed by tearing it around the waist, the front and back sheets tear almost diagonally downward along the diamond shape, and do not tear in the waist direction, resulting in abnormal tearing. I will not invite you. Moreover, since the welded portions are separated from each other in the vertical direction of the diaper, in other words, since a non-welded area is interposed between the welded portions, air permeability there is obtained and the tearing is easy. is there.

An intermittently arranged rectangular welding pattern is provided between and in the vicinity of the elastic members around the waist and the legs, and the long side is parallel to the elastic members around the waist and the legs. In the provided mode, these welding patterns are less likely to peel the front and rear bodies along the longitudinal direction compared to the welding pattern having a substantially rhombic shape. There is no risk of tearing.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pants-type diaper.

FIG. 2 is a perspective view of a pants-type diaper developed in the front-rear direction.

FIG. 3 is a partially enlarged view of a pants-type diaper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Diaper 2 Top sheet 3 Back sheet 4 Absorbent core 5 Front body 6 Back body 10 Welding part 11 Waist opening 12 Leg opening 13 Waist elastic member 14 Leg elastic member 17, 18, 19 Welding pattern 17A , 18A Long side

Claims (2)

[Utility model registration claims] 1. A liquid-absorbent core is interposed between a liquid-permeable top sheet and a liquid-impervious back sheet, each of which is heat-sealable, and the front surface extends laterally from a side edge of the core. The back sheet is overlapped on the waist side and the front body and the back body are joined by sealing them with welds located along the vertical direction, forming a waist opening and a leg opening. A disposable pants-type diaper to which a plurality of waist and leg elastic members are attached in parallel with each other in a direction around the openings along the periphery thereof, at least the waist elastic member and the leg elastic The diaper is characterized in that the welding portion between the diaper and the member has a substantially rhombus shape that is separated from each other in the vertical direction of the diaper, and has a pair of corners substantially facing each other in the vertical and horizontal directions of the diaper. 2. A liquid-absorbent core is interposed between a liquid-permeable top sheet and a liquid-impervious back sheet, each of which is heat-weldable, and the front surface extends laterally from a side edge of the core. The back sheet is overlapped on the waist side and the front body and the back body are joined by sealing them with welds located along the vertical direction, forming a waist opening and a leg opening. In the disposable pants-type diaper, in which a plurality of waist circumference and leg circumference elastic members are attached in parallel to each other in the circumferential direction of the openings along the circumference thereof, the welding portion is between the waist elastic members. In the vicinity thereof, and the first welding pattern forming a rectangular intermittently arranged long side parallel to the waist circumference elastic member, and between the respective leg surrounding elastic members and in the vicinity thereof, And the long side is parallel to the elastic member around each leg. A second welding pattern having a rectangular shape intermittently arranged, and being disposed between the waist and the elastic members around the legs, being separated from each other in the vertical direction of the diaper and substantially in the vertical and horizontal directions of the diaper. The diaper is characterized in that the diaper comprises a substantially rhombus-shaped third welding pattern having a pair of corners facing each other.