Apparatus for making a thermoplastic product from a base plastic

Details Apparatus for making a thermoplastic product from a base plastic Apparatus for making a thermoplastic product from a base plastic

1988-01-13

1989-05-30

Thurlow, Jeffery

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

264 75, 264171, 26421121, 264245, 264349, 425207, 425208, 425381, 4253823, B29C 4704

Patent

active

048346390

ABSTRACT:
In the extrusion process an inhomogeneous thermoplastic marbled product is made from a base plastic material and at least one marbling additive material mixed therein. The additive material is fed into the interior of an extrudate flow made from the base plastic material in an extruder device. The extruder has a mixing head at the end of its screw having a narrow throat surrounded by a ring. The ring is formed with angularly spaced slot-like passages for the base material. The additive veining plastic is fed through the mixing head downstream of this throat.

REFERENCES:
patent: 3664789 (1972-05-01), Gibney
patent: 4183673 (1980-01-01), Easley et al.
patent: 4289408 (1981-09-01), Langlois
patent: 4548776 (1985-10-01), Holdredge, Jr.
patent: 4749279 (1988-06-01), Csongor

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