Patent ID: 6398993
Filing Date: 2002-06-04
Classification: B29C

Abstract:
A method for producing a synthetic resin film comprising a film supplying step for supplying an original film, a film tentering step for clamping both longitudinal edges of the film supplied from the film supplying step by a pair of continuously moving clamp means provided along both side edges of the film and for stretching the clamped film in the transverse direction of the film, a film recovering step for taking over the film supplied from the film supplying step, without feeding it to the film tentering step, and a film running direction changing step for cutting the film running toward the film recovering step and feeding the tip of the film to the film tentering step, and further comprising detecting the side edge position of the film fed toward the film recovering step and changing the positions of the pair of clamp means in the transverse direction of the film based on a signal obtained through the detecting.