Composite extensible member and method of manufacturing the same

An extensible composite member comprising two sheet materials and a plurality of elastic members intermediate between the sheet materials,

• wherein the sheet materials being discontinuously bonded to each other in the extending direction of the elastic members and a direction perpendicular thereto to form a plurality of joint lines each composed of a plurality of joints in each of the two directions,
• the joint lines in the direction crossing the extending direction each have a ratio of a pitch P11 of arranging the fusion joints to a length L11 of the individual fusion joints (P11/L11) ranging from 1.05 to 80, and the pitch P11 of arranging the fusion joints is 1 to 40 mm,
• at least two of the elastic members being disposed along the joint lines in the extending direction to overlap each of the joints composing the respective joint lines and fixed between the sheet materials at the individual joints, and
• the sheet materials each forming folds between the joint lines in the direction perpendicular to the extending direction.

An extensible composite member comprising two sheet materials and a plurality of elastic members disposed between the sheet materials,

• wherein the two sheet materials being partly bonded to each other to form joints,
• the joints lining up to make joint lines in a direction crossing the extending direction of the elastic members,
• a part of the joint lines and another part of the joints being different in positions of the joints making up each joint line in the direction crossing the extending direction,
• the ratio of the pitch P11 of the fusion joints in the individual joint lines to the length L11 of the individual fusion joints in the joint lines (P11/L11) ranges from 1.05 to 80, and the pitch P11 of the fusion joints is 1 to 40 mm,
• the elastic members being each fixed between the sheet materials at least part of the joints, and
• the sheet materials each forming folds between every two adjacent joint lines.