METHOD FOR PRODUCING OBLIQUELY STRETCHED FILM

This method for producing an obliquely stretched film comprises an oblique stretching step wherein a film is transported while gripping both ends of the film in the width direction thereof with a pair of gripping tools and relatively advancing one gripping tool and relatively delaying the other gripping tool, and a path for transporting the film is bent in an arc shape, to thereby stretch the film in an oblique direction with respect to the width direction. In the oblique stretching step, the temperature of the film at the termination point of the arc-shaped bend in the transportation path for stretching the film in the oblique direction is set lower than that at the starting point of the bend. 种斜向拉伸膜的制造方法，具有如下斜向拉伸工序：用对把持件把持膜的宽边方向的两端，使侧的把持件相对地先行，使另侧的把持件相对地延迟而输送膜，并且使膜的输送路径圆弧状地弯曲，由此将膜相对于宽边方向在斜方向拉伸。在斜向拉伸工序中，将用于在斜方向拉伸的输送路径的圆弧状的弯曲的结束时刻的膜的温度比弯曲的开始时刻低。