Extrusion head with color-changing device

Details Extrusion head with color-changing device Extrusion head with color-changing device

1996-10-29

1998-06-30

Davis, Robert

Plastic article or earthenware shaping or treating: apparatus

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

Extrusion shaping means

425113, 4251331, 425462, B29C 4720

Patent

active

057730377

ABSTRACT:
The device (2) for changing the outside coating color of the extruded product is seated directly in the extrusion head (1), thus minimizing the length of the duct (25) in which the colored extrudates would be liable to mix; on the other hand, since no colored extrudate can stagnate upstream from that duct, the colored coating is always composed of freshly extruded material. Thus, the transition from one color to another is extremely short on the finished product, so that no faulty material is to be found on that product. The color changing device is essentially composed of an axially movable needle-valve (24) which can be actuated by various means. Through design modifications of this needle-valve, a two-color coating can be produced. An extrusion head equipped with such a device is particularly well adapted to the solid or expanded insulation of electric conductors, although other types of extruded objects can also be produced according to the same principle.

REFERENCES:
patent: Re34711 (1994-08-01), Compagnon
patent: 3143583 (1964-08-01), Haugwitz
patent: 3257482 (1966-06-01), Schecter
patent: 4182601 (1980-01-01), Hill
patent: 4761129 (1988-08-01), Aste et al.
patent: 4832960 (1989-05-01), Compagnon
patent: 4998870 (1991-03-01), Seibert
patent: 5108683 (1992-04-01), Anand
patent: 5197514 (1993-03-01), Jaun
patent: 5262119 (1993-11-01), Smith

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