System for producing non-compatible zipper film

Details System for producing non-compatible zipper film System for producing non-compatible zipper film

1987-04-23

1988-07-12

Little, Willis

Flexible bags

With closure

Rib and groove

156 66, B65D 3316

Patent

active

047566299

ABSTRACT:
A method and apparatus of forming a reclosable bag of flexible film wherein the bag has confronting side walls joined by seams at its edges and confronting rib and groove fastener strips at the top edge with the strips joined to the inner faces of the bag walls by bonding layers which have a predetermined width such that when a spot seal is formed at the ends of the strips, leakage is prevented between said strip ends so that the interconnecting profiles of the strips are sealed in permanent alignment. The flattened melted material of the spot seals is secured to the bag walls by the bonding layer and the predetermined width of the bonding layer is wider than the spot seals.

REFERENCES:
patent: 3904468 (1975-09-01), Noguchi
patent: 4341575 (1982-07-01), Herz
patent: 4428788 (1984-01-01), Kamp
patent: 4654878 (1987-03-01), Lems
patent: 4691372 (1987-09-01), Van Erden
patent: 4691373 (1987-09-01), Ausnit

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