| abstract |
(57) [Summary] [PROBLEMS] To reduce the time from the start of production of a stretched film to stabilization, to promptly cope with the occurrence of retardation unevenness generated during the production, and to have different characteristics. It is possible to respond promptly when the conditions for manufacturing a product are changed. SOLUTION: In the production of a stretched film, Re spots generated in a stretching step are detected, and the stretching temperature is controlled based on the data. |