Extrusion process and apparatus

Details Extrusion process and apparatus Extrusion process and apparatus

1975-11-17

1978-03-21

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

Stock pressurizing means operably associated with downstream...

Including heating or cooling means

425381, 425467, B28B 320

Patent

active

040801381

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.

REFERENCES:
patent: 2402281 (1946-06-01), Green
patent: 3611495 (1971-10-01), Langecker
patent: 3857914 (1974-12-01), Aishima et al.
patent: 3860372 (1975-01-01), Newman, Jr.

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