METHOD OF PRODUCING DIAGONALLY ORIENTED FILM

Japanese Patent JP2019123092

A

To provide means to suppress corrugation deformation occurring in a film edge, reduce deviation in an orientation angle in a breadth direction, and suppress lowering of in-plane retardation Ro after an endurance test even in a case of producing a diagonally oriented film using resin low in heat shrinkability.SOLUTION: A method of producing a diagonally oriented film of this invention includes a diagonally orienting step for producing the diagonally oriented film by bending a conveying direction midway while conveying a film base material in one direction. The method satisfies expressions: T1<0%≤T2 and -7.0%