Plastic film zipper bag having straightened heat seals
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United States of America Patent
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-
Oct 6, 1992
Grant Date -
N/A
app pub date -
Mar 22, 1991
filing date -
Mar 22, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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Family
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Cited Art Landscape
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