Process and apparatus for producing a thermoplastic film

Details Process and apparatus for producing a thermoplastic film Process and apparatus for producing a thermoplastic film

B - Operations, Transporting

29

C

18/1040

B29C 55/06 (2006.01)

Patent

CA 1086917

Abstract of the Disclosure Thermoplastic films with improved mechanical and physico- chemical properties are manufactured in such a manner that the film, in one operating step, is heated for a short time (e.g. 1 to 10 seconds), under tension (which causes an elonga- tion of at least 25%) and orientation, to the thermoplastic temperature of the plastic material used and subsequently subjected to further orientation by deformation within the range of its thermo-elastic temperature or its crystalline melting point. PVC film (K value above 65) is formed e.g. at a temperature below 180°C and subsequently heated, under stretching and orientation, to at least 200°C. An apparatus for carrying out the process is also described.

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