Gas-barrier shrink films and their use in deep-drawing applications

摘要

Abstract A multi-layer, gas-barrier, biaxially oriented and heat-shrinkable film comprising a) a first outer heat-sealable layer b) an inner gas-barrier layer, and 5 c) a second outer abuse resistant layer that contains at least 28 % by weight of polystyrene polymer, preferably made up for a major proportion by a high styrene styrene-butadiene block copolymer, in the second outer abuse-resistant layer c) and/or in one or more inner layers positioned between the first outer heat-sealable layer a) and the inner gas-barrier layer b) and/or in one or more 10 inner layers positioned between the gas-barrier layer b) and the second outer abuse layer c). The film of the invention showed to be particularly suitable to be deep-drawn to form a flexible container in a packaging process where the end vacuum lidded package is heat shrunk. Ft/