Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1981-07-30
1982-07-27
Dixon, Jr., William R.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
138137, 138140, 138177, 264323, 264570, 264514, 428220, 4284744, 428480, 428523, 428524, 526270, 526309, 526323, 526335, 5263481, 526351, 524425, 524427, 524449, 524451, 524557, 524582, 524584, 524585, 524586, 524587, 524593, 524604, 524605, 524606, B29C 2300, F16L 912, B32B 2706, B32B 2732, C08F11006, C08F 3800, C08F 2226, C08F 3600
Patent
active
043418279
ABSTRACT:
The invention is directed to biaxially oriented thermoplastic polymer flexible film having a substantially uniform thickness between about 0.005 and 0.030 of an inch (0.13 mm and 0.76 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 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 comprised 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.
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Austen Alfred A.
Humphries Darral V.
Bethlehem Steel Corporation
Dixon Jr. William R.
O'Keefe Joseph J.
Simitz John S.
Wilkinson Charles A.
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