Stretch layered sheet, disposable wearing article, and method and device for manufacturing stretch layered sheet

A method for manufacturing a stretchable layered sheet comprising at least one sheet of non-woven fabric that includes thermoplastic fibers and is air-permeable, and a thermoplastic and stretchable film layered on the non-woven fabric, the method comprising:

• a first conveying step of conveying the non-woven fabric while stretching the non-woven fabric;
• a second conveying step of conveying the film in a stretched state;
• a step of layering together the non-woven fabric and the film while performing the first and second conveying steps;
• a step of thermally bonding together the non-woven fabric and the film, which have been layered together, at a plurality of attachment portions, wherein each one of the attachment portions includes at least one thermal bonding area a where the non-woven fabric and the film are thermally bonded together;
• a step in which a part of the film in the stretched state breaks due to the thermal bonding along at least one boundary line, which defines the thermal bonding area, thereby forming a first opening in the film to be a first vent that exerts air permeability in the stretched state;
• and
• a step in which a part of the film that is adjacent to the thermal bonding area and delimited by the at least one boundary line becomes absent as a result of the thermal bonding, thereby forming a second opening to be a second vent that exerts air permeability both in the stretched state and in a non-stretched state,
• the first opening and the second opening provided for each of the at least one boundary line that defines the thermal bonding area.