Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1977-12-05
1980-02-05
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
264176R, 264209, B29F 310
Patent
active
041872690
ABSTRACT:
Process and apparatus for extruding synthetic resinous thermoplastic materials, wherein a heat plastified stream of such material is divided into a primary or core stream, and non-primary or secondary stream(s), the secondary stream(s) heated to a temperature substantially hotter than the core stream, and the hot secondary stream(s) thereafter layered onto the opposite surfaces of the core stream prior to expelling the material from an extrusion die. Such a process and apparatus is practiced to avoid a loss of surface smoothness in the extruded product.
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patent: 3780149 (1973-12-01), Keuchel et al.
patent: 3860372 (1975-01-01), Newman
patent: 3904730 (1975-09-01), Shimizu et al.
Blanchard Robert R.
Hutchinson Loyd B.
The Dow Chemical Company
Woo Jay H.
Young A. J.
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