Device for continuous hot-sealing of thermoplastic films

Details Device for continuous hot-sealing of thermoplastic films Device for continuous hot-sealing of thermoplastic films

1988-01-27

1989-10-31

Wityshyn, Michael

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

With work feeding or handling means

156 736, 1565801, 1565831, B30B 1534

Patent

active

048774782

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.

REFERENCES:
patent: 3439392 (1969-04-01), McNab, Jr.
patent: 3505136 (1970-04-01), Attwood
patent: 3703427 (1972-11-01), Sellers et al.
patent: 3787257 (1974-01-01), Akerlund
patent: 4353776 (1982-10-01), Giulie et al.

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