Absorbent article and method and device for manufacturing absorbent article

1. A method for manufacturing an absorbent article that comprises a first sheet member, a second sheet member, a first elastic member, and side-seal sections, wherein the elastic first member is attached to the first sheet member, the first sheet member is stretchable in a lateral direction using the first elastic member, the side-seal sections are disposed at each lateral end portion of the absorbent article, the first sheet member and the second sheet member are overlaid in a thickness direction and welded together at the side-seal sections, and the thickness direction intersects the lateral direction, the method comprising:

arranging first elastic-member continuous bodies between a pair of mutually-opposing facing surfaces of a first sheet member continuous body that is transported in a transport direction that is the same as the lateral direction, wherein

the first elastic-member continuous bodies and the first sheet member continuous body are arranged continuously in the transport direction, and

the first elastic-member continuous bodies are in a stretched state in the transport direction and spaced side-by-side in a CD direction that intersects the transport direction and the thickness direction;

disposing first welding portions spaced apart in the transport direction and the CD direction on the first sheet member continuous body, wherein

the welding portions join the pair of mutually-opposing facing surfaces of the first sheet member continuous body,

the first welding portions are disposed on two sides of the first elastic-member continuous bodies in the CD direction while the first elastic-member continuous bodies are maintained in the stretched state,

the welding portions are disposed so that, by direction-of-transport contraction and CD-direction expansion of the first elastic member after cutting of the absorbent article, the first elastic member is sandwiched and pressed in the CD direction by the first welding portions on the two sides of the first elastic-member continuous bodies, and

the first welding portions are disposed so that a portion of at least one of the first welding portions overlaps with at least a portion of the side-seal sections in a thickness direction of the first sheet member continuous body;

overlaying, in the thickness direction, a second sheet member continuous body on the first sheet member continuous body where first the welding portions are disposed, wherein the second sheet member continuous body is arranged continuously in the transport direction;

disposing, in the transport direction, the side-seal sections on each of two sides of cutting target positions spaced apart at a predetermined pitch in the transport direction on the first sheet member continuous body, wherein the first sheet member continuous body and the second sheet member continuous body are welded together at the side-seal sections; and

the cutting of the absorbent article, after the disposing of the side-seal sections, by cutting the first sheet member continuous body, the first elastic-member continuous bodies, and the second sheet member continuous body at the cutting target positions.

2. The method according to claim 1 , wherein at least one of the first welding portions is disposed between one of the side-seal sections and one of the cutting target positions in the transport direction.

3. The method according to claim 1 , wherein

the at least one of the first welding portions that overlaps with the side-seal sections is a first overlapping-joining portion, and

at least one of the first welding portions other than the first overlapping-joining portion straddles one of the cutting target positions in the transport direction.

4. The method according to claim 1 , wherein

the first welding portions are disposed for each of the first elastic-member continuous bodies,

at least one of the first elastic-member continuous bodies are disposed farther than an endmost portion of the side-seal sections in one direction along the CD direction, and

the first welding portions of the at least one first elastic-member continuous body are disposed farther than the endmost portion of the side-seal sections in the one direction.

5. The method according to claim 4 , wherein

each of the first welding portions disposed farther than the endmost portion of the side-seal sections is a one-side joining portion, and

the first sheet member and the second sheet member are overlaid such that the first sheet member has a portion in which the one-side joining portion is disposed and that protrudes farther than an end of the second sheet member in the one direction.

6. The method according to claim 1 , wherein in the first sheet member continuous body and the second sheet member continuous body, an adhesive is not provided in a portion where the side-seal sections are disposed.

7. The method according to claim 1 , wherein

a second elastic member is attached to the second sheet member,

the second sheet member is stretchable in the lateral direction using the second elastic member,

the method further comprises:

arranging second elastic-member continuous bodies between a pair of mutually-opposing facing surfaces of the second sheet member continuous body, wherein

the second elastic-member continuous bodies are arranged continuously in the transport direction, and

the second elastic-member continuous bodies are in the stretched state and spaced side-by-side in the CD direction;

disposing second welding portions spaced apart on the second sheet member continuous body in the transport direction and the CD direction, wherein

the second welding portions join the pair of mutually-opposing facing surfaces of the second sheet member continuous body,

the second welding portions are disposed on two sides of the second elastic-member continuous bodies in the CD direction while the second elastic-member continuous bodies are maintained in the stretched state,

the second welding portions are disposed so that, by direction-of-transport contraction and CD-direction expansion of the second elastic member after the cutting of the absorbent article, the second elastic member is sandwiched and pressed in the CD direction by the second welding portions on the two sides of the second elastic-member continuous bodies, and

the second welding portions are disposed so that a portion of at least one of the second welding portions overlaps with at least a portion of the side-seal sections in a thickness direction of the second sheet member continuous body;

in the overlaying of the second sheet member continuous body on the first sheet member continuous body, overlaying the second welding portions on the first welding portions; and

in the cutting of the absorbent article, further cutting the second elastic-member continuous bodies at the cutting target positions.

8. The method according to claim 7 , wherein

the at least one of the second welding portions that overlaps with the side-seal sections is a second overlapping-joining portion,

the second sheet member continuous body and the first sheet member continuous body are overlaid such that the first overlapping-joining portion is shifted in the transport direction or the CD direction with respect to the second overlapping-joining portion closest to the first overlapping-joining portion.

9. The method according to claim 1 , wherein

the at least one of the first welding portions that overlaps with the side-seal sections is a first overlapping-joining portion,

a downstream one of the side-seal sections disposed on two sides of the cutting target positions in the transport direction is a downstream side-seal section,

the first overlapping-joining portion overlaps with the downstream side-seal section, and

in the transport direction, an upstream end of the first overlapping-joining portion located downstream with respect to an upstream end of the downstream side-seal section.

10. The method according to claim 9 , wherein in the transport direction, the upstream end of the first overlapping-joining portion is located downstream with respect to a central position of the downstream side-seal section.

11. The method according to claim 1 , wherein

at least two of the first welding portions are disposed at a predetermined formation pitch in the transport direction to span and extend beyond the side-seal sections and the cutting target positions in the transport direction, and

a size of the predetermined formation pitch is smaller than a direction-of-transport size of the side-seal sections.