B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1040, 18/777
B29C 55/18 (2006.01) B29C 47/00 (2006.01) B29C 53/30 (2006.01) B29C 55/16 (2006.01) C08J 5/18 (2006.01) F16L 9/12 (2006.01)
Patent
CA 1166808
A BIAXIALLY ORIENTED THERMOPLASTIC POLYMER FILM AND METHOD OF MANUFACTURE Abstract of the Disclosure The invention is directed to biaxially oriented thermoplastic polymer flexible film having a substantially uniform thickness between about .005 and .030 of an inch (.13 mm and .76 mm) and characterized by a structure comprised of discrete, platelet-like spherulitic crystalline aggregates compressed transversely to the plane of the film and biaxially oriented in the plane of the film and having a combination of improved properties and also to a rigid conduit or extrudate having a plurality of thermoplastic crystalline polymer layers each of which has e a unique microstructure and improved properties. The film is produced by solid state hydrostatic extrusion of a generally cylindrical preform comprised of a plurality of concentric tubular-like discrete layers of polymers through an extrusion zone having converging walls and a diverging geometry, wherein the discrete layers in the preform are substantially simultaneously circumferentially expanded and axially elongated by compressive forces to produce an oriented polymer rigid tubular extrudate com- prised of a plurality of concentric tubular-like layers of oriented polymer. The tubular extrudate or preform is slit longitudinally so that the discrete layers of the extrudate can be separated into individual films. -1-
407869
Austen Alfred R.
Humphries Darral V.
Bethlehem Steel Corporation
Smart & Biggar
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