B - Operations – Transporting – 29 – F
Patent
B - Operations, Transporting
29
F
18/726
B29F 3/014 (1980.01)
Patent
CA 1155265
AN ORIENTED, SEMI-CRYSTALLINE POLYMER PRODUCT AND METHOD AND APPARATUS FOR PRODUCING SUCH PRODUCT Abstract of the Disclosure A thick-walled, seamless, rigid conduit having a substantially uniform wall thickness which is not less than about 0.5 percent of the outside diameter consisting essen- tially of an oriented crystalline thermoplastic polymer characterized by a structure comprised of radially compressed discrete, platelet-like spherulitic crystalline aggregates and having a combination of good ultimate tensile strength and low temperature tensile impact strength is described. The conduit is fabricated by solid state hydro- static extrusion of a substantially non-oriented semi- crystalline thermoplastic polymer preform which may contain up to about 60 weight percent filler. The polymer is sub- stantially simultaneously elongated in both circumferential and axial directions by compressive forces with the circum- ferential elongation being at least 100 percent. The apparatus used to produce the product is a hydrostatic extrusion press which includes an annular orifice in which the thermoplastic polymer is elongated substantially simultaneously circumferentially and axially with the circum- ferential elongation being at least 100 percent. Means for maintaining the rigidity of tooling and the hydrostatic extrusion fluid pressure while providing a film of the fluid on the preform for lubricity are provided in the apparatus. -1- A sheet substantially uniform in thickness and having substantially the microstructure and properties of the conduit and excellent drawability may be made from the conduit. An article of manufacture may be made by solid state deformation processing of the conduit or the sheet. -2-
412516
Austen Alfred R.
Humphries Darral V.
Bethlehem Steel Corporation
Johnson Ernest Peter
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