Method for treatment of a fibrous material-fluid mixture
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United States of America Patent
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Aug 24, 1993
Grant Date -
N/A
app pub date -
Jun 29, 1990
filing date -
Jul 3, 1989
priority date (Note) -
Expired
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Abstract
The invention relates to a method and device for the washing of a medium consistency fibrous slurry, especially a chemical pulp slurry in which the slurry is fed at an inclined angle onto a substantially horizontal portion of circulating filter belt, and then distributed over substantially the entire working width of the filter belt. The distributed slurry is then washed with a washing liquid under localized pressure to produce a slurry having a medium consistency range, i.e., about 8 to 15 percent. In order to increase the consistency to 20 to 40 weight percent, preferably about 30 to about 35 weight percent, the washed slurry is passed to a pressing zone.
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