Processing, MD and TD Stretching of Cast Polypropylene Film and Evaluation of Film Performance

Not all the polypropylene of film grades are suitable for manufacturing of biaxially stretched film. Material selection was implemented via hot tensile and rheological tests. Processing conditions were optimized for producing very thin uniform oriented film in machine and transverse directions. Different physical and mechanical properties pertaining to performance of the film in packaging application were measured and compared to the undrawn film. The enhancement in properties arises from stress induced crystallization and formation of row-nucleated lamellar structure

Keywords:

Polypropylene , Cast Film , Biaxially Stretching , Orientation