Process for sealing a filled sack made of thermoplastic plastic and provided with gussets
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United States of America Patent
Stats
-
Mar 4, 2003
Grant Date -
Jan 31, 2002
app pub date -
Jul 30, 2001
filing date -
Jul 28, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sack made of thermoplastic plastic that has been provided with gussets is closed after being filled in that the open side of the sack is pulled tight and provided with a crosswise seal. In order to be able to produce the crosswise seal even when the region to be sealed is contaminated, the lateral regions of the crosswise seal are formed on the region of the sack, which is still lying flat, including the gussets and extending to the transitional region by a first sealing sequence, preferably by a thermal sealing process. After the sack has been filled, the middle region of the crosswise seal is produced by a second sealing sequence, preferably an ultrasound sealing process.
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