Apparatus for extruding plastic materials

Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Extrusion shaping means

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259 4AB, 425467, 425468, 425376, B29F 310

Patent

active

039471721

ABSTRACT:
Flow conditions in an extrusion head in a cross head type extrusion apparatus for applying a concentric plastic insulating covering uniformly around a longitudinally advancing filamentary core advancing axially through a die concentrically disposed in an extrusion chamber in the head, are improved by providing channeled tooling within the chamber which bends and divides an initial stream of plastic material forced into the chamber into a plurality of equal streams which combine symmetrically around the core. With respect to certain channels, the ratio of the length of the channel to its effective cross-sectional diameter exceeds a predetermined critical number to achieve the development of steady state fluid flow therein.
Additionally, whenever a stream of plastic material is divided subsequent to a bend before steady flow can develop therein, the division is made symmetrically with respect to the principal plane of the preceding bend to ensure identical pressure and velocity profiles in each of the divided streams.

REFERENCES:
patent: 2766480 (1956-10-01), Henning
patent: 2766481 (1956-10-01), Henning
patent: 2943351 (1960-07-01), Gray
patent: 3191230 (1965-06-01), Ashton
patent: 3486192 (1969-12-01), LeRoy
patent: 3737260 (1973-06-01), Kaye
patent: 3737506 (1973-06-01), Martin et al.
patent: 3758247 (1973-09-01), Deegen

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