MANUFACTURING METHOD FOR BIAXIAL STRETCHED FILM AND MANUFACTURING EQUIPMENT FOR BIAXIAL STRETCHED FILM

摘要

A manufacturing method and an apparatus for a biaxial stretched film is provided to increase a degree of crystallization of a film and lubrication of the films laminated by pre heat treatment. In a manufacturing method for a biaxial stretched film including the steps of a biaxial stretching process and a heat-treatment process, a film is stretched in a biaxial stretching process. A substrate film(2) is heat-treated in a heat treatment process. A certain tension ranging from 98 to 196 is applied from a side of a lower part.