Vacuum seal bar

Details Vacuum seal bar Vacuum seal bar

1983-02-28

1984-08-07

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156285, 156381, 156515, 493203, 493205, 493208, 493289, B32B 3118

Patent

active

044642199

ABSTRACT:
Disclosed are an apparatus and method for cutting and sealing a plastic film. The plastics film is conveyed to a sealing area which contains a sealing wire in a housing over which the plastics film is draped out of contact with the wire. The wire is preheated to a first temperature and is then heated to a second higher temperature while a differential pressure is applied to the film biasing it towards and into contact with the wire which cuts and heat seals it. By providing the heat sealing area in the outer periphery of a rotatable drum to which a continuous film is conveyed, a continuous cutting and heat sealing process can be achieved.

REFERENCES:
patent: 2229121 (1941-01-01), Nye et al.
patent: 2737859 (1956-03-01), Allison et al.
patent: 3950205 (1976-04-01), Hawkins et al.
patent: 4114520 (1978-09-01), Achelpohl et al.
patent: 4198259 (1980-04-01), Meulen

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