Patent ID: 9266278
Filing Date: 2016-02-23
CPC Classification: B29C,B29D,B29K,B29L

Claim Text:
1. A method of manufacturing an obliquely stretched long film that includes: an oblique stretching step of stretching a long film in an oblique direction with respect to a width direction to form the obliquely stretched long film, and a tension application step of applying, while drawing the obliquely stretched long film along a longitudinal direction, a tension in a drawing direction to the obliquely stretched long film by using a roll, wherein in the tension application step, the obliquely stretched long film is drawn while the tension in the drawing direction of the obliquely stretched long film is changed in the width direction by using the roll such that a difference between a maximum value and a minimum value of an orientation angle in the width direction of the obliquely stretched long film is smaller than immediately after the oblique stretching step.