B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/726
B29D 23/00 (2006.01) B01D 39/16 (2006.01) B29C 47/00 (2006.01) B29C 47/24 (2006.01) B29C 47/54 (2006.01) B29C 55/22 (2006.01) B29C 67/00 (2006.01) B29C 67/04 (2006.01) F16L 11/06 (2006.01)
Patent
CA 1081422
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. A ram type extruding apparatus having a central mandrel and a die connected to a cylinder and within which a ram is slidable to force the mixture into the die is used in the process and during the process, at least an end portion of the die is rotated in one direction during the extrusion of the mixture into a tubing material. In a preferred embodiment, both the die and the mandrel are rotated in opposite directions to achieve the extrusion. Thus, a molded product is produced which is made fibrous by the shearing force in the extrusion direction as well as fibrous in a two dimensional direction by the application of the shearing force in the direction perpendicular to the extrusion direction. 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.
267627
Na
Sumitomo Electric Industries Ltd.
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