Preheating screw
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United States of America Patent
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Aug 20, 1996
Grant Date -
N/A
app pub date -
Apr 12, 1995
filing date -
Apr 12, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A preheating screw for the simultaneous mixing and heating of fine-grained or paste-like substances, in which intensive heat transfer takes place during transport of the substance by use of a rotating hollow screw that is filled with a heat-transfer medium, preferably a fluid, heat being transfered from the heat-transfer medium to the product by way of the heated hollow screw. An electrical heating device is installed in a hollow screw shaft, and is supplied with electrical energy via sliding contacts positioned on the outside of the screw shaft.
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