Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1983-05-23
1985-02-12
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
2642098, 4251311, 4251331, 425462, B29F 304
Patent
active
044990413
ABSTRACT:
A process is disclosed for the coextrusion of a multi-layered tube whereby at least one stream of molten polymer from a single-screw extruder is passed through a die; wherein the stream is divided into two concentric streams which are balanced by varying the area of a restrictor orifice placed in the central stream. Spider lines in the outer molten stream are eliminated by the use of a second restrictor means used downstream of an open chamber for reuniting the melt, which chamber is downstream of the spider legs.
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Hahn Granville J.
Murley Jackie D.
Rutledge Raleigh N.
Cosden Technology, Inc.
Sproule Robert H.
Thurlow Jeffery
Van Winkle Roy L.
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