Device for continuous hot-sealing of thermoplastic films
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United States of America Patent
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-
Oct 31, 1989
Grant Date -
N/A
app pub date -
Jan 27, 1988
filing date -
Feb 13, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a device for continuous hot-sealing of thermoplastic films. This device comprises a sealing head, the sealing head being provided with two rip cord electric resistances that are heated by causing an electric current to flow therethrough and being made of a material the electric resistance of which is proportional to the temperature, the sealing head being caused to rapidly vibrate against a counter-plate so as to cause the thermoplastic film to be sealed to be rapidly pounded as it glides between the head and the counter-plate. The sealing of the thermoplastic films is brought about by the synergistic action of the heat of the resistances and of the pressure due to the pounding.
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