Patent ID: 7121064

Claim:
A method of manufacturing an article, comprising the following steps: extending a web of bag making film under tension in a machine direction; joining a first zipper tape to said web along a first zone of joinder generally aligned with said machine direction; joining a second zipper tape to said web along a second zone of joinder generally parallel to said first zone of joinder of said first zipper tape and spaced apart therefrom; and folding said web in first, second and third mutually parallel zones extending in said machine direction, said first zone of folding being disposed between a first edge of said web and said first zipper tape, said second zone of folding being disposed between said first and second zipper tapes, and said third zone of folding being disposed between said second zipper tape and a second edge of said web, joining said first zipper tape to said web along a third zone of joinder generally parallel to said first zone of joinder; and joining said second zipper tape to said web along a fourth zone of joinder generally parallel to said second zone of joinder; wherein said first and third zones of folding are folded before said second zone of folding is folded.