Device for changing color during the extrusion of a sheath aroun

Details Device for changing color during the extrusion of a sheath aroun Device for changing color during the extrusion of a sheath aroun

1987-07-07

1988-08-02

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

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

Extrusion shaping means

264169, 264174, 425462, 4253823, B29C 4704

Patent

active

047611294

ABSTRACT:
Apparatus for extruding a sheath of synthetic material around a conductor, comprising an extruder head with two inlet conduits respectively connected to two orifices traversed by the conductor, and distributor means for selectively connecting the inlet conduits to a first and second extruder, the distributor means including a distributor communicating with the two extruders and to a first and second inlet conduit of the extruder head, and means for control of the distributor, the distributor having a mobile member which includes at least one pair of direct channels respectively providing communication of the first extruder with the first inlet conduit and of the second extruder with the second inlet conduit in a predetermined position of the mobile member, and a pair of inverted channels respectively providing communication of the first extruder with the second inlet conduit and of the second extruder with the first inlet conduit in another position of the mobile member. Different colors of synthetic material may be supplied to the respective inlet conduits, and the colors may be changed during production without wasting material.

REFERENCES:
patent: 3324739 (1967-06-01), Schrenk
patent: 3486195 (1969-12-01), Greenwood et al.
patent: 3979170 (1976-09-01), Monnet
patent: 4164956 (1979-08-01), Takahashi et al.
patent: 4182601 (1980-01-01), Hill

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