Heat sealing jaw assembly with film slackener

Details Heat sealing jaw assembly with film slackener Heat sealing jaw assembly with film slackener

1993-04-13

1994-07-05

Simmons, David A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156515, 1565831, 1565832, B32B 3100

Patent

active

053264169

ABSTRACT:
A heat sealing assembly, for sealing through at least two layers of thermoplastic film is disclosed. It is particularly adapted for use with a vertical form, fill and seal machine for packaging flowable materials. The heat sealing assembly comprises two jaws, resilient clamping elements and a heat sealing element, at least one of the jaws being capable of transverse motion and adapted to collapse a tubular film made from the thermoplastic film and passing between the jaws, each of said jaws having said element mounted thereon, said clamping elements being adapted to grip thermoplastic film which passes therebetween and urge said gripped film towards said jaws when the jaws close and to release said film when the jaws open. Clamping is accomplished without an activating device other than the jaws themselves. Preferably there are clamping elements on both sides of the jaws. Preferably the clamping elements are made of a flexible rubber.

REFERENCES:
patent: 3692613 (1972-09-01), Pederson
patent: 3775225 (1973-11-01), Schott, Jr.
patent: 3874976 (1975-04-01), MacFarland, Jr.
patent: 4115182 (1978-09-01), Wildmoser
patent: 4512138 (1985-04-01), Greenwalt
patent: 4744845 (1988-05-01), Posey
patent: 4761197 (1988-08-01), Christine et al.

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