Patent ID: 6393804
Filing Date: 2002-05-28
Classification: B31B

Abstract:
A method of forming a gusseted plastic zipper bag, comprising the steps of:a. providing a continuous bag film with opposite side edges defining a width dimension of said bag, b. cutting in said bag film a spaced-apart pair of windows aligned the width dimension of said bag film, c. positioning a length of carrier web which has a thickness less than that of said bag film to transversely overlie said film, said length of carrier web including thereon a generally central section of zipper profile, a pair of zipper-free areas at opposite sides of said central section of zipper profile, and a pair of end sections of zipper profile at opposite ends of said zipper-free areas aligned with said central section of zipper profile, said two zipper-free areas being positioned to overlie and cover said pair of windows, d. sealing said length of carrier web onto said bag film, and. e. forming said bag film with said length of carrier web a hacked thereon into a bag.