Highly bi-axially oriented, heat-shrinkable, thermoplastic, multi-layer film and process for the manufacture thereof

摘要

A process for manufacturing a highly bi-axially oriented, heat-shrinkable, thermoplastic, multi-layer film comprising a core layer (A) comprising an ethylene-vinyl alcohol copolymer (EVOH), a first outer layer (B) comprising an ethylene homo-or co-polymer and a second outer layer (C), which may be equal to or different from the first outer layer (B), comprising an ethylene homo-or co-polymer, which process comprises extrusion of the film resins through a flat die and bi-axial orientation of the obtained cast sheet simultaneously in two perpendicular directions at an orientation ratio in the longitudinal direction higher than 4:1 and an orientation ratio in the cross-wise direction higher than 4:1. Also included is the film produced by the process.