Polymer film and production method thereof
AssigneeFuji Photo Film Co., Ltd.
InventorHiroshi Miyachi
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Abstract
A dope produced from cellulose acylate, solvent and additive, is cast on a belt and peeled as a film containing the solvent, with use of a peel roller. Then the film is dried to a film. After the peeling, the film is transported with use of plural rollers in an transfer section. Each roller is provided with a temperature controlling device for controlling the surface temperature of each roller. A surface temperature is controlled in the range of Tm (° C.) to Tm+50 (° C.), if the melting point of the additive for the dope is described as Tm (° C.). While the drying is made with support of the roller, the transporting becomes stable, and the roll-print defects and the scratch defects are reduced. Thus the produced film is excellent in smoothness and optical properties.
Claims5
A film production method with use of a polymer solution containing polymer, solvent and additive, comprising steps of:
- casting said polymer solution onto a running support to form a casting film;
- continuously peeling from said support said casting film as a film in a situation of containing said solvent;
- and
- performing a first drying of said film by a plurality of rollers whose temperatures are independently controlled.
Dependencies are inferred from the claim text.