Packages embodying a controlled peel seal and method of preparin

Details Packages embodying a controlled peel seal and method of preparin Packages embodying a controlled peel seal and method of preparin

1975-09-22

1981-02-24

Dixon, Jr., William R.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

206484, 206631, 156332, 156334, 220410, 229 35R, 428515, 428520, B32B 2708, B65D 7300

Patent

active

042528461

ABSTRACT:
Heat seals of closely controlled peel strengths are obtained utilizing a heat seal layer comprising essentially a blend of an ethylene vinyl acetate copolymer and a high density ethylene homopolymer, wherein a sealing temperature is employed adapted to activate the copolymer to seal, but insufficient to activate the homopolymer. Film packages prepared according to the invention may embody an easy opening peel seal achieved by sealing in the above-defined temperature range, and much stronger seals in other areas of the package achieved using the same heat seal layer, but a higher sealing temperature generally nearer the crystalline melting point of the homopolymer constituent.

REFERENCES:
patent: 3496061 (1970-02-01), Freshour et al.
patent: 3540962 (1970-11-01), Anzawa et al.
patent: 3560420 (1971-02-01), Tamura et al.
patent: 3595468 (1971-07-01), Repko
patent: 3617419 (1971-11-01), Fischer
patent: 3620435 (1971-11-01), Sogi
patent: 3682767 (1972-08-01), Britton et al.
patent: 3708388 (1975-01-01), Lindemann et al.
patent: 3725124 (1973-04-01), Gorton
patent: 3734798 (1973-05-01), Dooley
patent: 3817821 (1974-06-01), Gallini
patent: 4188441 (1980-02-01), Cook

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