Classifying – separating – and assorting solids – Sifting – With liquid treatment
Patent
1988-01-19
1990-05-22
Rolla, Joseph J.
Classifying, separating, and assorting solids
Sifting
With liquid treatment
209304, 209250, 2105121, 210784, 210788, B07B 122
Patent
active
049275291
ABSTRACT:
A method of and apparatus for separating knots from a fibre suspension in the wood processing industry. A known problem in the prior art has been the quick wear of the screen surface of the knotter when the screen surface has been profiled. On the other hand the ability to separate with an unprofiled screen has not been satisfactory. When using a profiled screen cylinder (5), it has been noticed in performed tests that it is preferable to feed the pulp from the connections (2) in the direction of rotation of the screen cylinder and also to discharge the reject from connections (4) and the accept from the connections (3) in the direction of rotation of the cylinder (5). Accordingly, there is not only less wear of the screen surface, but also a significantly smaller consumption of power per pulp ton than in the prior art apparatuses.
REFERENCES:
patent: 2038931 (1936-04-01), Goldberg et al.
patent: 2827169 (1958-03-01), Cusi
patent: 3933649 (1976-01-01), Ahlfors
patent: 3939065 (1976-02-01), Einarsson Ahlfors
patent: 4309284 (1982-01-01), Morimoto et al.
patent: 4466862 (1984-08-01), Ring et al.
Henricson Kaj O.
Repo Erkki T.
Ronkonharju Hannu U.
A. Ahlstrom Corporation
Bollinger David H.
Rolla Joseph J.
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