Abstract: A method for producing an underpants-type disposable diaper including a stretchable region stretchable at least in one direction in an outer body. The stretchable region is formed by stacking an elastic film between a first sheet layer composed of a nonwoven fabric and a second sheet layer composed of a nonwoven fabric. When the elastic film is stretched in the stretching and contracting direction, the first sheet layer and the second sheet layer are joined via through holes formed in the elastic film at a large number of sheet bond portions arranged at intervals in each of a stretching and contracting direction and a direction orthogonal thereto, and in the sheet bond portions, the first sheet layer and the second sheet layer (20B) are joined at least by a melted and solidified material of the elastic film among the first sheet layer and the second sheet layer.

Abstract: Both high air permeability and high peeling strength are achieved.

Abstract: A fitting to a male genitalia has a male-genitalia-facing portion. Portions on both sides thereof in a width direction, in an outer member of a front body, have an elastic film stretchable structure in which an elastic film is stacked between a first sheet layer and a second sheet layer, which are bonded by sheet bonded portions arranged at intervals. A change region is included in which an area rate of the bonded portions decreases stepwise or continuously from a central portion of the male-genitalia-facing portion in a width direction to the portions of the both sides of the male-genitalia-facing portion in the width direction. A portion of the change region other than a portion having the highest area rate of the bonded portions, is contracted in the width direction due to contraction of the elastic film in a natural length state and is extensible in the width direction.

Abstract: A method for producing an underpants-type disposable diaper including a stretchable region stretchable at least in one direction in an outer body. The stretchable region is formed by stacking an elastic film between a first sheet layer composed of a nonwoven fabric and a second sheet layer composed of a nonwoven fabric. When the elastic film is stretched in the stretching and contracting direction, the first sheet layer and the second sheet layer are joined via through holes formed in the elastic film at a large number of sheet bond portions arranged at intervals in each of a stretching and contracting direction and a direction orthogonal thereto, and in the sheet bond portions, the first sheet layer and the second sheet layer (20B) are joined at least by a melted and solidified material of the elastic film among the first sheet layer and the second sheet layer.

Abstract: A fitting to a male genitalia has a male-genitalia-facing portion. Portions on both sides thereof in a width direction, in an outer member of a front body, have an elastic film stretchable structure in which an elastic film is stacked between a first sheet layer and a second sheet layer, which are bonded by sheet bonded portions arranged at intervals. A change region is included in which an area rate of the bonded portions decreases stepwise or continuously from a central portion of the male-genitalia-facing portion in a width direction to the portions of the both sides of the male-genitalia-facing portion in the width direction. A portion of the change region other than a portion having the highest area rate of the bonded portions, is contracted in the width direction due to contraction of the elastic film in a natural length state and is extensible in the width direction.

Abstract: Both high air permeability and high peeling strength are achieved.