| 摘要 |
A method for producing a thermoplastic film, comprising cooling and solidifying a filmy thermoplastic melt resin, by holding it between a metallic presser and a metallic casting roll for cooling; wherein the temperature of the filmy thermoplastic resin just before being held between the metallic presser and the casting roll for cooling is from Tg+20° C. to Tg+90° C. and a difference between a surface temperature (Tt) of the metallic presser and a surface temperature (T1) of the casting roll for cooling satisfies the formula (1) and a contact length Q satisfies the following formula (2) <?in-line-formulae description="In-line Formulae" end="lead"?> 0.5 ° C.<=T 1 -Tt <=20 ° C. (1)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?> 0.1 cm<=Q<= 8 cm (2)<?in-line-formulae description="In-line Formulae" end="tail"?> The method provides a thermoplastic film having high thickness accuracy and surface smoothness.
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