Method and apparatus for screening waste paper pulp
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United States of America Patent
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Jan 28, 1997
Issued Date -
N/A
app pub date -
Oct 20, 1995
filing date -
Oct 20, 1993
priority date (Note) -
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Abstract
Waste paper stock pulp slurry supplied through a stock inlet is separated at screening sections to a high quality stock rejected stock containing contaminants and undefibered waste paper. The high quality stock is sent to a next stage as accepted stock. The rejected stock is sent to a defibering section and is diluted after defibration, part of the rejected stock; being circulated to the screening sections, the remainder being discharged out of the system through a rejection outlet. The provision of screening and defibering sections in one and the same screen can satisfy contradictory requirements, i.e., to increase contaminant removing efficiency, to raise production yield and to attain space and cost savings.
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