Patent ID: 7655165
Filing Date: 2010-02-02
Classification: A22C,C08L

Abstract:
1. A process for continuous casting of film sheets, comprising passing a film-forming fluid through the nip of a pair of side-by-side heated rollers, said film-forming fluid being a dispersion comprising structurally expanded cellulose dispersed in a continuous aqueous phase including at least one plasticizer, in an amount sufficient to impart flexibility to said film sheets, said fluid being converted to a plasticized film having opposite coherent surfaces respectively engaging opposite rollers of said pair, said film becoming divided between said opposite surfaces into two distinct, self-supporting, continuous film sheets after exiting the nip of said rollers, each sheet having one side comprising one of said opposite coherent surfaces adhering to a surface of one of said rollers, and a second side which is opposite the side adhering to the roller surface, and which has microscopic protuberences extending from the surface thereof, the one side of each sheet facing said roller surface being relatively smooth, said rollers being heated sufficiently to dry the resulting continuous film sheets, said resulting sheet releasing intact from the surface of each roller.