Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1979-09-05
1981-08-04
Dixon, Jr., William R.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
264323, 264570, 428220, 4284744, 428523, 428524, 428480, 428910, 260 37N, 260 37R, 260 40R, 260 40P, 260 4246, 5263481, 526309, 526323, 526335, 526270, 526351, B29C 2300, F16L 912, B32B 2706, B32B 2732
Patent
active
042822777
ABSTRACT:
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 essentially 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 hydrostatic extrusion of a substantially non-oriented semi-crystalline thermoplastic polymer preform which may contain up to about 60 weight percent filler. The polymer is substantially simultaneously elongated in both circumferential and axial directions by compressive forces with the circumferential 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 circumferential 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.
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.
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Austen Alfred R.
Humphries Darral V.
Bethlehem Steel Corporation
Dixon Jr. William R.
O'Keefe Joseph J.
Simitz John S.
Wilkinson Charles A.
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