Feed screw for sedimentation or treatment systems
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United States of America Patent
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Jun 25, 1996
Grant Date -
N/A
app pub date -
Jan 20, 1995
filing date -
Jan 22, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention concerns a feed screw in the form of a self-supporting, axleless helix whose surface extends essentially radially, the feed screw being used in sedimentation or treatment systems for clearing suspensions in paper making processes. The invention is characterized by a second helix whose surface, or generatrix, deviates preferably between 0.degree. and 20.degree. from the direction of the central axis and extends in the feed direction. The second helix may deviate between 0.degree. and maximally 40.degree. and have a length--per lead--between 20% and 40% of the lead of the helices.
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