Process for extruding large oriented polymer shapes

Details Process for extruding large oriented polymer shapes Process for extruding large oriented polymer shapes

B - Operations, Transporting

29

C

B29C 47/00 (2006.01)

Patent

CA 2044538

- 22 - ABSTRACT OF THE DISCLOSURE In a solid state extrusion process a semi-crystalline polymer billet in a pressure chamber is forced through a die at the end of the chamber, with the polymer passing through the die at a temperature between 30°C below the alpha-crystalline temperature and the melting point of the polymer to form an oriented polymer profile. The pressure chamber is heated to about 0.50- 0.95 of the melting point of the polymer and the die is heated to about 0.65-1.2 of the melting point of the polymer, with the die preferably being heating to at least 5°C warmer than the billet. A haul off stress on the profile extruded from the die is maintained between at least 0.5 MPa and a maximum amount without plastic deformation of the extrudate to obtain an oriented profile having a cross-sectional area greater than 0.5 cm2 at an extrusion rate greater than 0.5 m/min. F501\A45036\wjm

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