Process for producing articles from polytetrafluoroethylene

Details Process for producing articles from polytetrafluoroethylene Process for producing articles from polytetrafluoroethylene

B - Operations, Transporting

29

B

18/1214

B29B 7/40 (2006.01)

Patent

CA 1209314

A B S T R A C T A process for producing articles of polytetra- fluoroethylene (PTFE) is disclosed. The process allows some of the conventional plastic fabrication techniques to be used with PTFE which until now have not been possible. The process comprises the steps of intensively mixing and thermokinetically heating PTFE granules in an enclosed container with a plurality of blades attached to arms rotating about an axis, with a blade tip speed of at least 30 meters/second, to a pre- determined discharge temperature of above 370°C, discharging the granules at the discharge temperature, forming the discharged, heated granules into an article of desired shape at or below the discharge temperature, and cooling the shaped article.

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