Process for the production of a moulding composed of foamed polyetrafluoroethylene

摘要

The method for the production of molded body from thermoplastically processable and foamable polytetrafluoroethylene by a conventional extruder, comprises supplying the polytetrafluoroethylene to a chemically active foaming agent in the extruder at a decomposition temperature of 320[deg] C, introducing a gas to the polytetrafluoroethylene in molten condition in the extruder, and stripping the mold body after its discharge from the extruder without further measures concerning the foaming process in production direction. The method for the production of molded body from thermoplastically processable and foamable polytetrafluoroethylene by a conventional extruder, comprises supplying the polytetrafluoroethylene to a chemically active foaming agent in the extruder at a decomposition temperature of 320[deg] C, introducing a gas to the polytetrafluoroethylene in molten condition in the extruder, and stripping the molded body after its discharge from the extruder without further measures concerning the foaming process in production direction. The polytetrafluoroethylene is added to ammonium polyphosphate as foaming agent in a quantity of 0.5-3 wt.% or ammonium phosphate as foaming agent in a quantity of 0.15 wt.% and additionally added to a nucleating agent in a quantity of 0.5-1.5 wt.%, related to 100 wt.% of polytetraflouroethylene.