Method and apparatus for manufacturing packaging bags, and bags obtained thereby
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United States of America Patent
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-
Feb 5, 2002
Grant Date -
Sep 27, 2001
app pub date -
Jun 4, 2001
filing date -
Jan 29, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a method of manufacturing packaging bags having lateral bellows, the method being characterized by the fact that it comprises the steps consisting in: forming respective cutouts (150, 160) in each of the two lateral, bellows-forming zones of a packaging bag sheet (100) so that the bag has only two thicknesses superposed at the mouth of said bellows, at least over a portion of its width; and heat-sealing (184, 186) the adjacent edges of the sheet to the peripheries of the cutouts (150, 160) to close the bag. The invention also provides apparatus for implementing the method and bags obtained thereby.
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