Method and machine for welding thermoformed sheets of plastics material
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United States of America Patent
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Apr 17, 2001
Grant Date -
N/A
app pub date -
May 5, 1998
filing date -
May 7, 1997
priority date (Note) -
Expired
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Abstract
A method and apparatus for welding thermoformed sheets of plastic material having lands formed therein such that the lands are welded to one another utilizing tubes which are positioned to be in line with the lands in a stack of thermoformed sheets so as to direct hot and cold gas to the lands to complete the welding process. In some embodiments, a plurality of tubes are inserted from opposite sides of blocks of stacked thermoformed sheets such that the tubes enter cells defined between the sheets of the block.
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