Extrusion apparatus for producing marbeleized thermoplastic extrusions
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United States of America Patent
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-
May 1, 1990
Grant Date -
N/A
app pub date -
Mar 14, 1988
filing date -
May 27, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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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