Method and apparatus for screening waste paper pulp
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United States of America Patent
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Oct 15, 1996
Grant Date -
N/A
app pub date -
Oct 4, 1994
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 and a reject containing contaminants and undefibered waste paper. The high quality stock is sent to a next stage as accept. The reject is sent to a defibering section and is diluted after defibration, part of the reject being circulated to the screening sections, the remainder being discharged out of the system through a reject outlet. 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-saving.
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