Method and device for making packaging bags and resulting bags
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United States of America Patent
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Jul 17, 2001
Grant Date -
N/A
app pub date -
Sep 29, 1998
filing date -
Jan 29, 1997
priority date (Note) -
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status (Latency Note)
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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 of 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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