Classifying – separating – and assorting solids – Sifting – With liquid treatment
Patent
1990-10-15
1991-12-24
Huppert, Michael S.
Classifying, separating, and assorting solids
Sifting
With liquid treatment
209273, B07B 100
Patent
active
050749951
ABSTRACT:
An apparatus for separating undesired particles from a suspension flow of pulp and for dividing the suspension flow into fractions is described. The apparatus comprises a housing having a first chamber with an inlet for the suspension flow and a first outlet for the undesired particles, a second chamber with a second outlet and communicating with the first chamber through a first annular gap, and a third chamber with a third outlet and communicating with the second chamber through a second annular gap, the radial extension of the second gap being less than that of the first gap. First and second rotating discs are carried by a shaft for common rotation therewith. The first disc is disposed in the first chamber in front of the first gap to separate the undesired particles by means of teeth protruding from the first disc. The second disc is disposed in the second chamber in front of the second gap to remove, by means of teeth protruding from the second disc, particles in form of twigs, undissolved fiber bundles and any remaining undesired particles from the suspension flow in front of the second gap. The discs have cavities axially aligned with the first and second gaps, respectively, to form axial passages, said second disc and said second gap cooperating to divide the suspension flow into a coarse fraction which is removed through the second outlet and a finer fraction which passes through said second annular gap and is removed through the third outlet.
REFERENCES:
patent: 4303508 (1981-12-01), Skretting
patent: 4737274 (1988-04-01), Jacobsen et al.
patent: 4911828 (1990-03-01), Musselmann et al.
patent: 4941970 (1990-07-01), Ahs
patent: 4968417 (1990-11-01), Ahs
patent: 4991720 (1991-02-01), Hoglund et al.
Huppert Michael S.
Kamyr Aktiebolag
Wacyra Edward M.
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