Disposable diaper and method for incorporation of elastic member into such diaper

Claim 1

A method for incorporation of elastic members into a disposable diaper including a topsheet, a backsheet, an absorbent body fixedly interposed between said both sheets, and elastic members arranged in respective side flaps formed by portions of said both sheets extending beyond opposite outer edges of said absorbent body so as to be closely laid upon one another so that longitudinal elastic lines are formed in said side flaps to fit said side flaps around infant's thighs, said method comprising steps of feeding an elastic member in the form of a tape consisting of six (6) to ninety (90) rubber strings joined together in parallel, said rubber strings each having a substantially equal cross-sectional area of 0.03 mm 2 to 0.45 mm 2 and a totally cross-sectional area of 0.18 mm 2 to 2.7 mm 2 , separating these rubber strings along joints thereof into individual rubber strings while stretched at a stretching ratio of 100% to 400%, supplying respective three (3) to forty-five (45) rubber strings of said six (6) to ninety (90) rubber strings onto regions of the diaper to be formed into said side flaps at appropriate intervals while these rubber strings are applied with adhesive agent, and adhesively securing these rubber strings in said regions.

Claim 2

A method for incorporation of elastic members into a disposable diaper including a topsheet, a backsheet, an absorbent body fixedly interposed between said both sheets, and elastic members arranged in respective side flaps formed by portions of said both sheets extending beyond opposite outer edges of said absorbent body so as to be closely laid upon one another so that longitudinal elastic lines are formed in said side flaps to fit said side flaps around infant's thighs, said method comprising steps of feeding an elastic member in the form of a tape consisting of six (6) to ninety (90) rubber strings joined together in parallel, said rubber strings each having a substantially equal cross-sectional area of 0.03 mm 2 to 0.45 mm 2 and a totally cross-sectional area of 0.18 mm 2 to 2.7 mm 2 , separating these rubber strings along joints thereof into individual rubber strings while stretched at a stretching ratio of 100% to 400%, supplying respective three (3) to forty-five (45) rubber strings of said six (6) to ninety (90) rubber strings onto regions of the diaper to be formed into said side flaps at appropriate intervals while these rubber strings are applied with adhesive agent, and adhesively securing these rubber strings in said regions.