Patent ID: 7185475

Claim:
A method of manufacture comprising the following steps: (a) folding a length of a web having first and second parallel edges along first, second and third folds that are substantially parallel to said first and second edges, said folded web comprising a first portion extending from said first fold to said second fold, a second portion extending from said second fold to said third fold, said first and second portions confronting each other, a third portion extending from said first fold, and a fourth portion extending from said third fold, wherein no portion of said third and fourth portions is disposed between said first and second portions; (b) joining a back of a length of a first flangeless zipper strip and a portion of said third portion of said length of said web that is near or adjacent said first fold to an intervening portion of said first portion of said length of said web that is near or adjacent said first fold, thereby forming a first double-layer seal; (c) joining a back of a length of a second flangeless zipper strip and a portion of said fourth portion of said length of said web that is near or adjacent said third fold to an intervening portion of said second portion of said length of said web that is near or adjacent said third fold, thereby forming a second double-layer seal; (d) inserting a slider onto said lengths of said first and second flangeless zipper strips, said first double-layer seal passing between said back of said length of said first flangeless zipper strip and a first sidewall of said slider, and said second double-layer seal passing between said back of said length of said second flangeless zipper strip and a second sidewall of said slider; (e) joining respective distal portions of said third and fourth portions of said length of said web to each other to form a shroud that covers said first and second flangeless zipper strips and said slider; and (f) prior or subsequent to the performance of step (e), forming a first opening in said third portion of said length of said web that is situated so that said slider is exposed through said first opening after steps (a) through (f) have been performed.