Coextrusion die

Details Coextrusion die Coextrusion die

1976-01-28

1978-10-03

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

Plural distinct feed inlets

264173, 4251331, 425381, 425382R, 425466, 425467, B29D 2304

Patent

active

041181670

ABSTRACT:
A multiple-cavity extrusion die for coextruding a plurality of indefinite lengths of multiple-layer tubular rubbery material. Core mandrels which extend into openings in the face of the die are adjustable for concentricity with respect to the die by internal or special external adjusting means. Cylindrically shaped core dies have frustro conically shaped forward portions which form extrusion dies with the cores for the core layer of rubbery material and form extrusion dies with a beveled back edge of an adjustable cylindrical cover die. Each of the cover dies is axially adjustable with respect to a respective core die to adjust the speed at which the individual tubes are extruded so that the speed of all tubes can be equalized. Special concentricity plates on the face of the covered dies are adjustably mounted with respect thereto so as to adjust the die openings for concentricity of the cover layer of rubbery material of each tube.

REFERENCES:
patent: 3365750 (1968-01-01), Donald
patent: 3404432 (1968-10-01), White et al.
patent: 3697209 (1972-10-01), Schiesser
patent: 3752614 (1973-08-01), Bremer
patent: 3856448 (1974-12-01), Iijima et al.
patent: 3860372 (1975-01-01), Newman
patent: 3948079 (1976-04-01), Fuchs, Jr.

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