B - Operations – Transporting – 29 – F
Patent
B - Operations, Transporting
29
F
18/726
B29F 3/014 (1980.01)
Patent
CA 1094767
ABSTRACT OF THE DISCLOSURE This invention discloses a novel method and apparatus for extruding polytetrafluoroethylene tubing materials from a mixture of polytetrafluoroethylene and a lubricant. The method of extruding the tubing material from the mixture of poly- tetrafluoroethylene and a lubricant uses a ram type extruding apparatus which has a central mandrel and a die connected to a cylinder along and within which a ram is slidable to force the mixture into the die. The method includes the step of rotating at least the central mandrel in one direction during the extrusion of the mixture into a tubing material. The apparatus has a cylinder for receiving the thermoplastic material to be formed into the tubing material, a tapered die connected to the cylinder to define an outer configuration of the tubing material, a ram disposed in the cylinder which is adapted to push the material in the cylinder toward said die, and a central mandrel extending through the cylinder and the die to define an inner configuration of the tubing material. The apparatus includes a second device for rotating at least the center mandrel in one direction during the extrusion. The products produced by this method are stronger and show greater elongation percentages than the prior art as well as the diameter of these products being able to be made greater after extrusion when compared with conventionally made products.
331614
George H. Riches And Associates
Sumitomo Electric Industries Ltd.
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