Apparatus for manufacturing extruded polytetrafluoroethylene products

摘要

There is disclosed an apparatus for forming a PTFE green tube, comprising: an extrusion die (16) defining an elongate die cavity; an elongate mandrel (26) concentrically located within said die cavity, said die cavity and said mandrel (26) defining a passageway therebetween for extrusion of PTFE paste therethrough; means for relatively rotating said die (16) with respect to said mandrel (26); and temperature control means for maintaining the temperature of said PTFE paste at a substantially constant uniform temperature during said extrusion thereof.