Reclosable zipper with tamper evident feature

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

1993-12-09

1995-07-25

Johnstone, Adrienne

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

24399, 24400, 24576, 24587, 156 82, 15624418, 15624427, 156260, 1562726, 383 61, 383 63, 383211, 493213, 493214, B32B 3120, B32B 3130, B65D 3324, B65D 3334

Patent

active

054358647

ABSTRACT:
A plastic bag having a reclosable plastic zipper is provided with a tamper-evident, non-reclosable peel seal formed by coextruding an adhesive onto a side strip adjacent to the interlocking zipper. The coextrusion causes the adhesive to preferentially adhere to the side strip when the peel seal is broken. A method for manufacturing the reclosable plastic zipper includes the steps of coextruding a zipper profile including a plane area with an adhesive on the plane area, 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: 4925318 (1990-05-01), Sorensen
patent: 4947525 (1990-08-01), Van Erden
patent: 4966470 (1990-10-01), Thompson et al.
patent: 4969967 (1990-11-01), Sorensen
patent: 5188461 (1993-02-01), Sorensen
patent: 5224779 (1993-07-01), Thompson et al.
patent: 5238306 (1993-08-01), Heintz et al.

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