Oriented heat-sealable multilayer packaging film
AssigneeW. R. Grace & Co., Cryovac Div.
InventorJulian H. Schoenberg
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Abstract
A three layered heat shrinkable, heat sealable thermoplastic packaging film having a desired combination of physical characteristics is disclosed. The film may be utilized to package a wide variety of items. A preferred embodiment of the film comprises a core layer consisting essentially of a linear low density polyethylene and two surface layers comprising a three component blend of (1) a linear low density polyethylene, (2) a linear medium density polyethylene and (3) a copolymer of ethylene and vinyl acetate.
Claims20
An oriented heat sealable multilayer film comprising:
- a cross-linked core layer consisting essentially of a linear low density polyethylene;
- and
- two cross-linked surface layers each comprising a three component blend of (1) a linear low density polyethylene, (2) a linear medium density polyethylene and (3) an ethylene vinyl acetate copolymer.
An oriented heat sealable three layer packaging film comprising:
- a cross-linked core layer consisting essentially of a linear low density polyethylene;
- two cross-linked surface layers each comprising a three component blend of (1) from about 40% to about 60%, by weight, of a linear low density polyethylene, (2) from about 20% to about 30%, by weight, of a linear medium density polyethylene and (3) from about 20% to about 30%, by weight, of an ethylene vinyl acetate copolymer.
An oriented heat sealable three layer packaging film comprising:
- a cross-linked core layer consisting essentially of a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter;
- and
- two cross-linked surface layers each consisting essentially of a three component blend of (1) about 50%, by weight, of a linear low density polyethylene having a density of about 0.920 grams per cubic centimeter, (2) about 25%, by weight, of a linear medium density polyethylene having a density of about 0.935 grams per cubic centimeter and (3) about 25%, by weight, of an ethylene vinyl acetate copolymer comprising from about 3.3% to about 4.1% vinyl acetate derived units, said copolymer having a density of from about 0.9232 to about 0.9250 grams per cubic centimeter.
Dependencies are inferred from the claim text.