摘要 |
<p>PURPOSE: Provided a method and apparatus for producing a synthetic resin film which particularly brings reducing abnormal deformation or breaking of the film in the tenter and promoting efficiency in production of films. CONSTITUTION: A film production process having a film tentering step and a recovering step, is characterized by detecting the side edge positions of the film running toward the recovering step, transferring the film running direction based on the detected information, and controlling the clamp start position of the film arriving at a tenter in the tentering step by clamp means, in the transverse direction of the film. A film production process having a film tentering step, is also characterized by controlling the clamp start position of a film arriving at a tenter by clamp means, in the range from 5 mm to 1,000 mm from the tip of the film in the longitudinal direction of the film</p> |