AIRTIGHT EVACUABLE STORAGE BAG AND RELATED METHOD OF MANUFACTURE
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United States of America Patent
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Issued Date -
Jul 30, 2009
app pub date -
Jan 28, 2009
filing date -
Jan 30, 2008
priority date (Note) -
Abandoned
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Abstract
Methods for manufacturing airtight storage containers (e.g., bags or pouches) made from thermoplastic web material and having heat-sealed margins along a perimeter. To ensure that the storage containers are airtight, an unheated rib is pressed along each heat seal while the web material in the region of each heat seal is still in a softened and pliable state. As a result of the pressure applied, the rib deforms the contacted portion of the heat-sealed web material, leaving an indentation upon cooling of the web material that serves as an air leakage barrier. This air leakage barrier ensures that any air leakage pathway across the heat seal region is closed.
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