Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1988-05-19
1989-12-19
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
264173, 264DIG69, 4251311, 425132, 425192R, B29C 4774
Patent
active
048881465
ABSTRACT:
An article such as a length of plastic tubing is integrally formed by melt extrusion and having opposite ends which in turn are provided with different flexibilities. The apparatus and extrusion method by which such articles are forming in a running length includes a gear assembly rotatable between at least two alternate positions whereby two different but mixable resins are alternatively extruded as product.
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Doherty Robert J.
Thurlow Jeffery
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