Transverse direction zipper applicator and method
AssigneeIllinois Tool Works Inc.
InventorVictor Delisle
Life of this patent
Estimating the term…
Abstract
An apparatus for attaching discrete lengths of zipper at spaced intervals across a web of bag making film has an endless belt supported between a pair of pulleys for moving zipper segments into position on the web. The zipper segments are cut from a zipper supply and fed into a nip between the endless belt and the web top surface. After a zipper segment is deposited into position on the web, the endless belt is raised. A vertically movable sealing bar below the web is raised into position to heat the web to seal the zipper to the web after which the sealing bar is lowered. The web then advances and the process is repeated.
Claims6
An apparatus for attaching discrete lengths of zipper having a pair of interlocked profiles at spaced intervals across a film, one of said profiles being atop the other profile, said apparatus comprising:
- a film drive for moving a web of bag making film along a path off a supply roll, said web having a top surface and a bottom surface;
- a zipper segment drive extending transverse to the film path and at least partially across the film path for moving a zipper segment having a discrete length across the top surface of the film in a direction transverse to the moving direction of the web;
- and
- a sealer disposed below the web bottom surface and aligned with said zipper drive for sealing said web top surface to a bottom one of said zipper profiles by capturing said web between said sealer and said zipper drive.
Dependencies are inferred from the claim text.