PROCESS FOR PRODUCING ARTICLES FROM POLYTETRAFLUOROETHYLENE

摘要

A process for producing articles of polytetrafluoroethylene (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 predetermined discharge temperature of above 370 DEG 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.