the present invention is directed to an improved cast film process for manufacturing amorphous film from a polymeric material , particularly a toughened polymeric material . the improvement is directed to a simple and efficient method for obtaining appropriate , controlled orientation of a film produced from a resin such as polyester , wherein the die gap and other factors affecting orientation are properly adjusted to provide a final amorphous film having reduced aging and &# 34 ; splitting &# 34 ; problems .