Stretchable structure of absorbent article and manufacturing method of the same

A method of manufacturing a stretchable structure of an absorbent article, comprising:

• using a first sheet layer made of a spunbond nonwoven fabric and a second sheet layer made of an air-through nonwoven fabric;
• sandwiching a plurality of elongated elastically stretchable members provided along a stretchable direction at intervals from each other between the first sheet layer and the second sheet layer, in which an air-through surface of the air-through nonwoven fabric is disposed to face a spunbond surface of the spunbond nonwoven fabric;
• and
• forming sheet bonded portions by bonding the first sheet layer and the second sheet layer via a hot melt adhesive disposed in a striped pattern that is intermittent in a longitudinal direction of the elastically stretchable members and continuously elongated in a direction intersecting with the elastically stretchable members;
• wherein the air-through surface is fluffier and configured to have a lower adhesiveness with respect to the hot melt adhesive than the spunbond surface;
• wherein in the forming of the sheet bonded portions, the hot melt adhesive is applied to the spunbond surface of the spunbond nonwoven fabric in the striped pattern that is intermittent in the longitudinal direction of the elastically stretchable members and continuously elongated in the direction intersecting with the elastically stretchable members;
• and
• wherein the hot melt adhesive is not applied to the air-through surface of the air-through nonwoven fabric.

A method of manufacturing a stretchable structure of an absorbent article, comprising:

• using a first sheet layer made of a spunbond nonwoven fabric and a second sheet layer made of an air-through nonwoven fabric;
• sandwiching a plurality of elongated elastically stretchable members provided along a stretchable direction at intervals from each other between the first sheet layer and the second sheet layer, in which an air-through surface of the air-through nonwoven fabric is disposed to face a spunbond surface of the spunbond nonwoven fabric;
• forming sheet bonded portions by bonding the first sheet layer and the second sheet layer via a hot melt adhesive disposed in a striped pattern that is intermittent in a longitudinal direction of the elastically stretchable members and continuously elongated in a direction intersecting with the elastically stretchable members;
• a step of applying the hot melt adhesive in which at least one of the first sheet layer and the second sheet layer is brought into contact with an engraved roll such that a circumferential direction of the engraved roll is a stretchable direction, and the hot melt adhesive, which is held in the striped pattern that is intermittent in the circumferential direction and continuous in an axial direction on the outer peripheral surface of the engraved roll, is transferred on at least one of the first sheet layer and the second sheet layer;
• and
• a step of performing pressure bonding in which the elastically stretchable members are sandwiched between the first sheet layer and the second sheet layer on at least one of which the hot melt adhesive is transferred;
• wherein the air-through surface is fluffier and configured to have a lower adhesiveness with respect to the hot melt adhesive than the spunbond surface;
• and
• wherein in the step of applying the hot melt adhesive, on the outer peripheral surface of the engraved roll, an application width of the hot melt adhesive in the circumferential direction is set to 0.5 to 4 mm, and an interval between the adjacent applications of the hot melt adhesive in the circumferential direction is set to 4 to 8 mm.