Process for preparing a polypropylene film for shrink packaging

Details Process for preparing a polypropylene film for shrink packaging Process for preparing a polypropylene film for shrink packaging

1977-11-21

1979-05-29

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Layered, stratified traversely of length, or multiphase...

264209, 264210R, 264230, 264342R, B29D 724

Patent

active

041567099

ABSTRACT:
A film for shrink packaging is prepared by extruding a tubular film made of crystalline polypropylene or crystalline ethylene-propylene copolymer containing up to 10% of ethylene monomer units, and from one to 10% of ethylene-vinylacetate copolymer containing 10 to 50% of vinyl acetate monomer units, and then biaxially stretching the tubular film.

REFERENCES:
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patent: 3271495 (1966-09-01), Gronholz et al.
patent: 3308215 (1967-03-01), Last
patent: 3433573 (1969-03-01), Holladay et al.
patent: 3510549 (1970-05-01), Tsuboshima et al.
patent: 3634552 (1972-01-01), Foglia et al.
patent: 3849520 (1974-11-01), Bullard et al.
patent: 3891737 (1975-06-01), Marsh et al.
patent: 3962388 (1976-06-01), Driscoll

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