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US 6,602,598 B1Granted
Quiet unwind stretch wrap film
AssigneeSLS Patent Corporation
InventorsDavid M. Simpson, Terry F. Jones, Charles M. Leonard
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Abstract
A novel multi-layer stretch film comprising at least 3 layers and having excellent mechanical properties and stretch film performance, comprising at least one outer or skin layer that has little or no cling or blocking characteristics in an unstretched state, but has substantial blocking characteristics when stretched. The stretch wrap films of the present invention have little or no unwind noise when removed from a stretch wrap film roll.
Claims31
A multi-layer, thermoplastic stretch wrap film comprising:
- (a) a skin layer comprising an ethylene homopolymer, propylene homopolymer, ethylene/alpha-olefin copolymer, ethylene/alpha-olefin terpolymer, or blends thereof;
- (b) a sub-skin layer comprising an ethylene homopolymer, propylene homopolymer, ethylene/alpha-olefin copolymer, ethylene/alpha-olefin terpolymer, or blends thereof;
- (c) a core layer an ethylene homopolymer, propylene homopolymer, ethylene/alpha-olefin copolymer, ethylene/alpha-olefin terpolymer, or blends thereof;
- wherein said stretch wrap film has a cling force of no more than 80 grams/inch when in an unstretched state and a cling force of at least 100 grams/inch when stretched at least 150% of the length of the unstretched state.
1 more element
A multi-layered stretch wrap film, comprising
- (a) a skin layer comprising an ethylene homopolymer, propylene homopolymer, ethylene/alpha-olefin copolymer, ethylene/alpha-olefin terpolymer, or blends thereof,
- wherein the skin layer comprises between 1 and 10 weight % of the total composition of the stretch wrap film;
- and
- wherein the stretch wrap film exhibits a noise of no more than 60 dB when arranged as a stretch wrap film roll and unwinding on a mechanical stretch wrapping machine at a rate of 50 to 200 feet/min, as measured approximately 12 to 18 inches from the stretch wrap film roll,
- wherein the skin layer loses integrity as an individual layer.
2 more elements
Dependencies are inferred from the claim text.