Multi-layer heat-shrinkage film with reduced shrink force, process for the manufacture thereof and packages comprising it
AssigneeCryovac, Inc.
InventorsSerge Bax, Paolo Ciocca, Edward Lee Mumpower
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Abstract
A heat-shrinkable film comprising a core layer comprising an ethylene-vinyl alcohol copolymer, two outer layers of blends comprising ethylene-vinyl acetate and ethylene-.alpha.-olefin copolymers, and two adhesive layers, characterized in that said film has a free shrink of at least 40%, preferably at least 45% and most preferably at least 50%, in both dimensions at 120.degree. C. and a maximum shrink force in the transversal direction, throughout its range of shrink temperatures, not exceeding 0.5. N/cm. The film is suitable to package deformable articles such as trays to give a tight package without causing deformation.
Claims9
A heat-shrinkable film comprising:
- a) core layer comprising an ethylene-vinyl alcohol copolymer;
- b) two outer layers comprising a blend of ethylene-vinyl acetate copolymer and ethylene-.alpha.-olefin copolymer;
- and
- c) two adhesive layers, wherein said film has
- i) a free shrink of at least 40% in both directions at 120.degree. C. and
- ii) a maximum shrink force in the transverse direction, throughout its range of shrink temperatures, not exceeding 0.5 N/cm.
Dependencies are inferred from the claim text.