Plastic zipper with end stops and method for manufacturing same
AssigneeIllinois Tool Works Inc.
InventorZdenek Machacek
Life of this patent
Estimating the term…
Abstract
A method for producing a zipper for use in the production of reclosable plastic bags of the type having the zipper extending across a top end of the bag. The zipper has a first profile member and a second profile member that is interengageable with the first profile member. At bag length intervals of the zipper notches are formed by removing at least a portion of the first profile member and a portion of said second profile member. A mold is positioned about each of the notches and a molten thermoplastic material is introduced into the mold cavity filling the notch and extending beyond the notch and over the zipper top so that when the molten thermoplastic material is cooled an end stop is formed in situ at each of said notches.
Claims13
A method of manufacturing a zipper for use in the production of reclosable plastic bags of the type having said zipper extending across a top end of the bag, said zipper comprising a first profile member and a second profile member interengageable with said first profile member, said method comprising the steps of:
- notching out said zipper at bag length intervals of said zipper to form a series of spaced notches by removing at least a portion of said first profile member and a portion of said second profile member;
- positioning a mold about each of said notches;
- introducing a molten thermoplastic material into said mold;
- and
- cooling said molten thermoplastic material whereby to form an end stop in situ at each of said notches.
A zipper for use in the production of reclosable plastic bags of the type having said zipper extending across a top end of the bag, said zipper comprising:
- a first profile member and a second profile member interengageable with said first profile member;
- a spaced series of notches in said zipper at bag length intervals of said zipper, at each of said notches, at least a portion of said first profile member and a portion of said second profile member being removed by each of said notches;
- and
- an end stop molded in situ at each of said notches.
Dependencies are inferred from the claim text.