Reclosable zipper with tamper evident feature

Details Reclosable zipper with tamper evident feature Reclosable zipper with tamper evident feature

1993-04-22

1995-06-20

Johnstone, Adrienne

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

24400, 156 82, 15624418, 156260, 1562726, 383 61, 383 63, 383211, 493213, 493214, B31B 190, B32B 3112, B32B 3120, B65D 3316

Patent

active

054258251

ABSTRACT:
A plastic bag having a reclosable plastic zipper is provided with a tamper-evident, non-reclosable peel seal formed by applying an adhesive to a treated strip adjacent to the interlocking zipper. The treatment is preferably by corona discharge, which causes the adhesive used to provide the peel seal to preferentially adhere to the treated strip when the peel seal is broken. A method for manufacturing the reclosable plastic zipper includes the steps of extruding a zipper profile, treating a portion of its surface, preferably by corona discharge, applying an adhesive to the treated portion, slitting the profile lengthwise, and folding over one of the resulting sides of the zipper to interlock them with one another.

REFERENCES:
patent: 3986914 (1976-10-01), Howard
patent: 4540537 (1985-09-01), Kamp
patent: 4947525 (1990-08-01), Van Erden
patent: 4966470 (1990-10-01), Thompson et al.
patent: 5224779 (1993-07-01), Thompson et al.
patent: 5238306 (1993-08-01), Heintz et al.

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