Classifying – separating – and assorting solids – Sifting
Patent
1975-03-28
1976-12-28
Halper, Robert
Classifying, separating, and assorting solids
Sifting
209262, 209304, 209359, 209106, B07B 100
Patent
active
040000630
ABSTRACT:
An improved system for the production of digested pulp from wood chips and knots which includes a separating apparatus, connected to the digester output, capable of separating knots from partially cooked wood chips and fibers at the digester pressure and consistency. The separated fibers and fiber bundles pass to a refiner where the fiber bundles are mechanically reduced to fibers in a liquid environment at a high consistency and at the digester pressure. The knots are then re-cycled to the digester or other processes.
The separating apparatus above uses a plurality of rotating members such as intermeshing screws or grooved rolls, arranged in a vertical screen to separate an inlet chamber from an outlet chamber. Knots cannot pass through the rotating members and thus are driven out of an outlet which communicates with the inlet chamber. The fibers, however, do pass through the rotating members to the outlet chamber and exit therefrom by a second outlet.
REFERENCES:
patent: 553945 (1896-02-01), Torrance
patent: 1841079 (1932-01-01), Barr
patent: 2748941 (1956-06-01), Fontein
patent: 2966267 (1960-12-01), Dunbar
patent: 2973093 (1961-02-01), Erickson
patent: 3219187 (1965-11-01), Ritze
patent: 3245535 (1966-04-01), Cowan
patent: 3626664 (1971-12-01), Hoffstrom
Halper Robert
Kamyr Inc.
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