Apparatus for heat sealing thermoplastic sheeting

Details Apparatus for heat sealing thermoplastic sheeting Apparatus for heat sealing thermoplastic sheeting

1988-07-27

1990-08-07

Culver, Horace M.

Package making

Progressively seamed cover web or web folds

With closing of web between package units

53568, 53373, B65B 902, B65B 906, B65B 5126, B65B 5128

Patent

active

049457128

ABSTRACT:
An improvement in film sealing apparatus, such as L-sealers, having an endless package discharge conveyor provides an arrangement for momentary conveyor reversal at the beginning of each sealing cycle to relieve film tension for maximization of seal strength. A cooling manifold directs an air stream at the transverse seal line at the completion of each sealing cycle to accelerate the curing of the seal to prevent undesired seal separation.

REFERENCES:
patent: Re30010 (1979-05-01), Shanklin
patent: 2613488 (1952-10-01), Attride
patent: 3239993 (1966-03-01), Cherrin
patent: 3347729 (1967-10-01), Seefluth
patent: 3429100 (1969-02-01), Zelnick et al.
patent: 3490981 (1970-01-01), Shanklin
patent: 3653177 (1972-04-01), Adams et al.
patent: 4035983 (1977-07-01), Shanklin
patent: 4219988 (1980-09-01), Shanklin
patent: 4532753 (1985-08-01), Kovacs
patent: 4650535 (1987-03-01), Bennett et al.
patent: 4719741 (1988-01-01), Mabry

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