| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method concerning effective orientation in the widthwise direction which can obtain a biaxially oriented polyamide film having uniform physical properties in the widthwise direction, by controlling a bowing phenomenon when the film is stretched in the widthwise direction. SOLUTION: In the method for producing the biaxially oriented polyamide film obtained by stretching a substantially unoriented polyamide film in the longitudinal direction and then in the widthwise direction, when the unoriented film is stretched in the width direction, the temperature of the unoriented film is changed in the widthwise direction of the unoriented film. |
