| 摘要 |
Apparatus for the molecular orientation of a polymeric film in the longitudinal direction, in which the film is pulled over two rotatable film supporting rollers which are closely spaced from each other and the first of which is heated and the second of which is cooled, the film is heated by an infrared heater which is located close to the rollers at the side of the film which is remote of the rollers, and in which the film is subjected to opposed tensional forces in order to stretch it longitudinally on its path from the first to the second roller. |
