Rotary film sealing and severing head for thermoplastics
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United States of America Patent
Stats
-
Jun 20, 1989
Grant Date -
N/A
app pub date -
Jul 22, 1988
filing date -
Jul 22, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary film sealing and severing device for use with thermoplastic film for forming packages. The device includes a rotating anvil assembly and a counter-rotating film cutting assembly having a heated sealing and cutting knife. First and second liquid cooled clamping bars on either side of the knife hold the layers of film together while the film is being sealed and cut. Cooling the clamping bars prevents the film from adhering to the clamps and causes the layers of film to quickly fuse together and allows high speed operation by preventing separation of layers of film due to slow cooling.
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