Extruder apparatus for sheathing a strand-form product, in parti

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

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Details

156500, 4251331, 425192R, 425462, B29C 4702

Patent

active

047706201

ABSTRACT:
Extrusion head for sheathing a strand-form product, in particular a cable, comprises a central hollow mandrel having a central bore through which the product to be sheathed passes. An intermediate mandrel surrounds the central mandrel with an annular material flow channel between forward portions of the mandrels for applying a first layer of sheathing. The intermediate mandrel has at its forward end a parti-spherical enlargement by means of which it is mounted in a socket at the forward end of a tubular guide piece with a ball and socket type joint permitting angular movement of the intermediate and central mandrels relative to the guide piece which is received in a casing mounted on a support. A second annular material flow channel is provided between the casing and the intermediate mandrel for applying a second layer of sheathing. Material is supplied to the respective annular flow channels by extruders provided at opposite sides of the extrusion head through supply tubes connected with ball-type joints to preclude lodging of sheathing material.

REFERENCES:
patent: 3228356 (1966-01-01), Schafer
patent: 3538547 (1970-11-01), Drabb
patent: 3606635 (1971-09-01), Benteler et al.
patent: 4116605 (1978-09-01), Burrell
patent: 4247504 (1981-01-01), Karppo
patent: 4495022 (1985-01-01), Viriyayuthakorn et al.
patent: 4548567 (1985-10-01), Missout
patent: 4623495 (1986-11-01), Degoix et al.

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