Plastic film zipper bag having straightened heat seals

Details Plastic film zipper bag having straightened heat seals Plastic film zipper bag having straightened heat seals

1991-03-22

1992-10-06

Garbe, Stephen P.

Flexible bags

With closure

Rib and groove

156 66, 156 84, 156183, B65D 3316

Patent

active

051526131

ABSTRACT:
In the manufacture of thermoplastic film zipper bags and the like heat sealing the film to the zipper produces a seal line that shrinks, resulting in unsightly apearance. A system and method are disclosed for restoring the shrunk seal line to its orginal length by corrugating and stretching it between mating teeth. A method is also disclosed for restretching the seal without corrugation.

REFERENCES:
patent: 3173184 (1962-09-01), Ausnit
patent: 3259951 (1964-07-01), Zimmerman
patent: 4479244 (1984-10-01), Ausnit
patent: 4698118 (1987-10-01), Takahashi
patent: 4976811 (1990-12-01), Siebert

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