Patent ID: 6602455
Filing Date: 2003-08-05
Classification: B29C,B29K,B32B,Y10S,Y10T

Abstract:
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 at an orientation ratio in the cross-wise direction higher than 4:1.