Longitudinal stretching process for the manufacturing of oriented polypropylene films

摘要

The invention relates to a process for the longitudinal stretching of an at least single-layer film of thermoplastic material.; The slow-moving part of the drafting unit comprises at least one driven roller (1,2,3) and the high-speed part of the drafting arrangement at least two driven rolls (2,3), wherein the pair of rollers (2,3) is arranged such that a nip (4) is formed in which the film (9) is guided such that it is simultaneously detected by the roller pair and extended.