PROCESS FOR LONGITUDINAL STRETCHING IN THE PRODUCTION OF ORIENTED POLYPROPYLENE FILMS

摘要

Process for longitudinal strentching in the production of oriented polypropylene films The invention relates to a process for the longitudinal stretching of an at least single-layer thermoplastic film. The slow-running part of the stretching machine contains at least one driven roll and the fast-running part of the stretching machine contains at least two driven rolls, the roll pair being arranged in such a way that a roll nip is formed, into which the film is fed in such a way that it is gripped simultaneously by the roll pair and stretched.