Apparatus for making a thermoplastic product from a base plastic material and at least one marbling additive material
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United States of America Patent
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May 30, 1989
Grant Date -
N/A
app pub date -
Jan 13, 1988
filing date -
Jan 13, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the extrusion process an inhomogeneous thermoplastic marbled product is made from a base plastic material and at least one marbling additive material mixed therein. The additive material is fed into the interior of an extrudate flow made from the base plastic material in an extruder device. The extruder has a mixing head at the end of its screw having a narrow throat surrounded by a ring. The ring is formed with angularly spaced slot-like passages for the base material. The additive veining plastic is fed through the mixing head downstream of this throat.
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