ApplicationNo. 06/221240 filed on 12/30/1980
US Classes:26/72, Biaxial expansion26/106, Including heater or dryer26/92, With heater or dryer264/290.2, Biaxial or transverse to travel direction425/66CONTINUOUS FILAMENT FORMING OR FILM CASTING MEANS WITH STRETCHING MEANS COMPRISING PRODUCT ADVANCING MEANS
ExaminersPrimary: Mackey, Robert R.
Attorney, Agent or Firm
International ClassesB29C 55/14 (20060101)
B29C 35/04 (20060101)
AbstractThe present invention is an apparatus for biaxial orientation of precrystalline polyacrylonitrile polymer sheet consisting essentially of a machine direction orientor which stretches the sheet in the machine direction a transverse direction orientor which stretches the sheet in the direction 90° to the machine direction, both processes of which may be completed rapidly in a heated essentially aqueous environment.