Extrusion apparatus for producing marbeleized thermoplastic extr

Details Extrusion apparatus for producing marbeleized thermoplastic extr Extrusion apparatus for producing marbeleized thermoplastic extr

1988-03-14

1990-05-01

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

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

Extrusion shaping means

264 75, 425197, 425205, 425206, 425380, 4253824, B29C 4704, B29C 4766

Patent

active

049214144

ABSTRACT:
The extrusion apparatus used to make a marbled section of a thermoplastic material is connectable to a screw press with at least one screw shaft and an extruder housing. A thermoplastic base material having one color is fed in using the screw press. A thermoplastic marbling material having another color is mixed with the thermoplastic base material. The extrusion apparatus includes an extrusion apparatus housing, a central passage for receiving the thermoplastic base material which encloses the screw shaft and a shaping outlet. The extrusion apparatus housing has at least one injector cavity in which an injection device for feeding in the thermoplastic marbling material is mounted. This injection device for feeding the thermoplastic marbling material projects fingerlike approximately transverse to the extrusion direction of the thermoplastic base material and has a plurality of injector ducts which open in the central passage at a variety of locations across the cross section of the central passage and a wall of the central passage is provided with a rifled section or insert.

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patent: 4687430 (1987-08-01), Morris et al.
patent: 4728279 (1988-03-01), Bellmer

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