Method for manufacturing zipper without shift in injection...

Details Method for manufacturing zipper without shift in injection... Method for manufacturing zipper without shift in injection...

2005-09-20

2005-09-20

Aftergut, Jeff H. (Department: 1733)

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

C425S814000, C264S154000

Reexamination Certificate

active

06946047

ABSTRACT:
A method for manufacturing a zipper without shift in injection molding comprises the steps of forming a bank of continuous zipper teeth at an edge of each of two parallel zipper strips by molding injection; wherein an inner side of each zipper strip has a respective connecting strip; scraping a part of zipper teeth on the zipper strip; melting two layers of films and coating the films on the upper and lower sides of the zipper strip; punching holes at inner lateral sides of the films, but the connecting strips are remained; guiding two zipper strips into an upper and a lower engaging piece molds; and tensioning the zipper strips within the molds; injection-molding engaging pieces; moving the molds from the zipper strips; cutting the zipper strips along the holes, thus forming the upper and lower engaging pieces of a zipper.

REFERENCES:
patent: 5536343 (1996-07-01), Kuse

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