| 摘要 |
<p>Appts. for prodn. of biaxially drawn plastic film, esp PVC film, has supply rollers and drawn rollers driven at different velocities, and two endless belts (b) which diverge relative to the lengthwise edges of the films and cooperate with these edges for transversely drawing the film. The belts are composed of metal plates fastened together by spiral springs which allow a free displacement of the metal plates without certain limits in the lengthwise direction of the belt, while pins extending perpendicular to the longitudinal direction of the belt are fastened to the plates.</p> |
