Method of making a stand-up plastic bag
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United States of America Patent
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-
Jan 14, 1992
Issued Date -
N/A
app pub date -
Jun 5, 1990
filing date -
Mar 21, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved method of making a stand-up plastic bag in which the side seam seals are formed at the same time as the gusset wall seals. The method includes the steps of supplying the film, folding the film to form the gusset, simultaneously forming the heat seals for the gusset walls and the side seams at one temperature, forming the heat seals to join the gusset walls together at a higher temperature, and separating the film into completed bags. The improved method provides greater efficiency and increased production rates.
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