Pressure sensitive gas valve for flexible pouch
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United States of America Patent
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-
May 30, 1995
Grant Date -
N/A
app pub date -
May 6, 1993
filing date -
May 6, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A flexible pouch having a pressure sensitive gas valve for releasing gas from a sealed flexible pouch is disclosed. The gas valve is integrally formed in the lateral edge portions of the front and back wall panels which are heat sealed to form the flexible pouch. The gas valve has an unobstructed tortuous gas pathway, preferably having convoluted channels, extending across at least one and preferably both of the lateral heat seals of the pouch with one end of the gas pathway opening into the interior of the flexible pouch and the outer end of the gas pathway open to the ambient atmosphere at the outer edge of the lateral heat seal. A method of forming a pressure sensitive gas valve in each lateral heat seal of a flexible pouch is also disclosed.
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