Pants type disposable diaper

Abstract

A pants type disposable diaper in which side seal sections simultaneously achieve both sufficient seal strength and ease of separation. In the pants type disposable diaper, a belly-side exterior sheet (12F) and a rear-side exterior sheet (12B) are separated from each other without being connected to each other on the crotch side. The exterior sheets (12F, 12B) have a waist-side folded back portion (21) and a crotch-side folded back portion (22). The crotch-side edge of the waist-side folded back portion (21) and the waist-side edge of the crotch-side folded back portion (22) agree with each other. The number of plies in that portion of a sheet-like air permeable material (12) which is at a waist-side end and the number of plies in that portion of the sheet-like air permeable material (12)which is at a crotch-side end are the same. Further, the number of plies in that portion of the sheet-like air permeable material (12) which is at an intermediate section between the waist-side end and the crotch-side end is the same as or less than the number of plies in those portions of the sheet-like air permeable material (12) which are at the waist-side end and the crotch-side end.

Description

technical field [0001] The present invention relates to a pants-type disposable diaper. Background technique [0002] Underpants-type disposable diapers often have a shorts-type structure consisting of an inner body and an outer sheet. There are leg gathers on both sides of the inner body, and the inner body is formed to cover the abdomen from the back side through the crotch portion, and the outer sheet is attached to the outer surface of the inner body, and is formed to cover the waist and the crotch area. The two side parts of the back part and the two side parts of the abdominal part in the outer covering sheet are respectively joined by heat sealing to form a side seal part, and a waist opening and a leg opening are formed in advance (refer to patent Documents 1-8). [0003] In such pants-type disposable diapers, for example Figure 25 As shown, in order to improve the fit to the body, the structure of such a structure is widely used: the exterior sheets 12F, 12B are ...

AI Technical Summary

Problems solved by technology

[0013] However, in conventional underpants-type disposable diapers, since the entire exterior sheet is formed by laminating a sheet-like air-permeable material, the air permeability and flexibility are lowered.

[0014] In addition, the side seal part is formed by laminating multiple layers of sheet materials such as non-woven fabrics, and the number of laminations of the sheet materials differs between the waist side end and the crotch side end of the side seal part. Problems like this: One of the welds is too strong and difficult to peel off; or one of the welds is too weak to cause accidental peeling during use

That is, if the upper part of the side sealing part is made to be properly welded, the welding of the lower part becomes insufficient, and there is a possibility that the seal will be peeled off due to the strong force applied around the legs. If the side part is properly welded, the upper part is welded firmly, and it is almost impossible to peel off after use, so it is extremely difficult to set appropriate conditions

[0016] In addition, such a problem is difficult to solve by changing the welding mode as described in each of the above-mentioned patent documents.

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