Screw element for same-sense rotating multi-screw extruders
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United States of America Patent
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Dec 13, 2005
Grant Date -
Jun 17, 2004
app pub date -
Mar 8, 2002
filing date -
Mar 22, 2001
priority date (Note) -
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Abstract
A screw element includes an outer radius Ra and a core radius Ri for multiscrew extruders with co-rotating and intermeshing screw shafts. The screw element has in axial cross section through its longitudinal axis a profile which has at each of the two axial end faces (i.e. a front end face and a rear end face) only one screw flight corresponding to a conventional single-start screw element for intermeshing screw shafts. In this case, the width (flight land angle φ) of the screw flight and conversely, in a corresponding way, the width (flight land angle φ) of the screw flight are formed in a special way and a shearing flight with a constant shearing flight radius Rs, which is greater than Ri, and less than Ra, is provided.
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