Process for preparation of biaxially drawn laminated films

Abstract From the Canadian patent

A biaxially drawn laminated films having a good oxygen barrier property, a good mechanical strength and high thickness uniformity are made by a process comprising:, a first step of forming a substantially amorphous unoriented laminated film comprising a saponified ethylene/vinyl acetate copolymer having an ethylene content of 25 to 45 mole% and a polyamide and, drawing the film in the longitudinal direction at a deformation rate of at least 10,000%/min and a draw ratio of 2.7 to 3.5 at 45 to 65°C by using a roll drawing machine;, a second step of transferring the film drawn at the first step to the transverse drawing-initiating point of a tenter type transverse drawing machine expanding the …