Heat sealing element for packaging machines which make lap-seale

Details Heat sealing element for packaging machines which make lap-seale Heat sealing element for packaging machines which make lap-seale

1993-04-13

1994-10-18

Bray, W. Donald

Package making

Closing packages and filled receptacles

By means adapted to engage outturned seam of package cover

156251, 156515, B65B 5100

Patent

active

053556569

ABSTRACT:
A heat sealing element, for sealing and simultaneously cutting 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, e.g. chocolate fudge sundae topping, in a lap seamed pouch. The heat sealing element has a portion, which has a greater electrical resistance than the remainder of the element, at the position where the lap seal is to be formed. The portion which has a greater electrical resistance is preferably a portion which is narrower than the remainder of the element, preferably 83 to 94% of the width of the remainder of the element.

REFERENCES:
patent: 3162564 (1964-12-01), Buchner
patent: 3409494 (1968-11-01), Korzinek
patent: 3692613 (1972-09-01), Pederson
patent: 3982991 (1976-09-01), Hamm et al.
patent: 4115182 (1978-09-01), Wildmoser
patent: 4774845 (1988-05-01), Posey
patent: 5056295 (1991-10-01), Williams

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