Heat shrinkable composite film and packaging method using same

Details Heat shrinkable composite film and packaging method using same Heat shrinkable composite film and packaging method using same

1988-03-01

1990-05-08

Buffalow, Edith

Stock material or miscellaneous articles

Hollow or container type article

Shrinkable or shrunk

428516, 428240, B65B 5300

Patent

active

049237225

ABSTRACT:
A heat shrinkable composite film comprises a core layer formed of (a) a straight chain, low density polyethylene having a density of 0.890-0.905 g/cm.sup.3 and a Vicat softening point of 60.degree.-80.degree. C. and/or (b) a copolymer of propylene and one or more .alpha.-olefins with 2-8 carbon atoms having a Vicat softening point of 70.degree.-110.degree. C., and two outer layers laminated over the opposite surfaces of the core layer and each formed of (c) a crystalline polypropylene resin having a melting point of 135.degree.-150.degree. C., the core layer having a thickness of 30-80% of the total thickness of the outer layers and the core layer.

REFERENCES:
patent: 3754063 (1973-08-01), Schirmer
patent: 4049147 (1977-09-01), Stiles et al.
patent: 4390385 (1983-06-01), Ferguson et al.
patent: 4755403 (1988-07-01), Ferguson

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