Process for the manufacture of equally biaxially oriented film

Details Process for the manufacture of equally biaxially oriented film Process for the manufacture of equally biaxially oriented film

B - Operations, Transporting

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B29C 49/08 (2006.01) B29C 47/00 (2006.01) B29C 55/14 (2006.01) B29C 55/28 (2006.01) B29D 7/01 (2006.01)

Patent

CA 1216409

TITLE OF THE INVENTION PROCESS FOR THE MANUFACTURE OF EQUALLY BIAXIALLY ORIENTED FILM ABSTRACT OF THE DISCLOSURE Equally biaxially oriented film is produced by extruding liquified polymer in tubular form, orienting the tubular film in the radial direction only and then either 1) equally orienting the radially oriented film in the long- itudinal direction and drying the resultant equally biax- ially oriented film while preventing any shrinkage thereof or 2) orienting the radially oriented film in the longi- tudinal direction to a degree less than said radial orienta- tion but equal to the radial orientation remaining after the biaxially oriented film undergoes radial shrinkage upon drying thereof in the absence of radial shrinkage control and drying the resultant biaxially oriented film in the absence of radial shrinkage control.

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