| 摘要 |
PROBLEM TO BE SOLVED: To compatibly establish a sufficient strength during wearing and easiness of peeling while suppressing sticking of fiber dust of nonwoven fabric in a seal device in a dot pattern.SOLUTION: The above problem is solved by an underpants-type disposable diaper characterized in that in a side seal part 13, a plurality of rows of point-like welded parts 13s, 13b arranged spaced apart at intervals in a longitudinal direction are arranged in a lateral direction, and non-welded parts 13n extending wholly in lateral direction are formed in dot patterns in both sides in a longitudinal direction of each of welded parts 13s, 13b. In the side seal part 13, at least a part of the longitudinal direction is a thin area LD, at least a part of the longitudinal direction is a dense area HD, the area of each of the welded parts 13b of the dense welded area HD is larger than that of each of the welded parts 13s of the thin welded part LD, and the thin welded area LD is formed in a polypropylene area constituted by laminating only nonwoven fabrics of polypropylene or a copolymer thereof. |
