Patent ID: 6767500
Filing Date: 2004-07-27
Classification: B29C

Abstract:
A method for forming a film by casting a ribbon on a support from a flow cast die while pulling said ribbon toward said support by providing a decompression area, said decompression area having at least a middle portion, a left portion and a right portion, said method satisfying the following formulae:0PCâˆ’PL)Ã—100/|PC|<15; 0PCâˆ’PR)Ã—100/|PC|<15; |PLâˆ’PR|Ã—100/|0.5(PL+PR)|<10; wherein PC is a degree of decompression in said middle portion, PL a degree of decompression in said left portion, and PR a degree of decompression in said right portion.