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US 10,239,296 B2Granted
Multilayer PVDC barrier heat shrinkable films
AssigneeCryovac, Inc.
InventorsFlavio Fusarpoli, Giuliano Zanaboni, Serena Stracuzzi
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Abstract
Multilayer barrier heat shrinkable films and flexible containers made therefrom, such as bags, pouches and the like, useful for packaging articles, in particular food items are described. These films are characterized by particular shrinking properties, which provide for tight packages reducing the drip loss from the product packaged therein. Moreover, the bags obtained from such films are endowed with very good optical properties and high abuse resistance.
Claims31
A multilayer coextruded biaxially oriented barrier heat-shrinkable packaging film comprising:
- (A) an outer heat-sealable layer (a);
- (B) a layer (b) which is not directly adhered to the heat sealable layer (a), wherein said layer (b) comprises at least one member selected from aromatic polyester and aromatic copolyester;
- and
- (C) at least one internal gas barrier layer (c) comprising polyvinylidene chloride, said film being characterized by a total free shrink at 85° C. of at least 45%, a maximum shrink tension in each one of the longitudinal and transverse directions of at least 20 kg/cm2, and a residual shrink tension at 5° C. in each one of the longitudinal and transverse directions at least of 25 kg/cm2, and wherein the total free shrink is measured according to ASTM D2732, the maximum shrink tension and the residual shrink tension are measured according:
- internal method MSTRST.
2 more elements
Dependencies are inferred from the claim text.