Method for treating pulp

Details Method for treating pulp Method for treating pulp

1990-03-28

1992-05-12

Fisher, Richard V.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With classifying, separating or screening of pulp

162251, 8156, 209211, 209273, D21C 900

Patent

active

051124440

ABSTRACT:
A method of treating a pulp suspension in a screening plant of a pulp mill wherein reject impurities are separated from defibered pulp by screening and/or cleaning, the cleaned pulp is thickened to a consistency of from about 10 to about 20%, the impurities are further treated in the screening plant by screening and defibering the accept fiber material for further screening and thickening and further reject impurities are removed from the screening plant after various screening stages, the method including effecting one or both of the pulp screening and cleaning stages in a closed, pressurized space in the screening plant and preventing the access of air to the pulp treated by effecting the thickening stages in a pressurized state and at the initial pressure of one or both of the preceding screening and cleaning stages.

REFERENCES:
patent: 1933609 (1933-11-01), Wagner
patent: 3664501 (1972-05-01), Cowan
patent: 4167438 (1979-09-01), Holz
patent: 4594152 (1986-06-01), Gullichsen
patent: 4961844 (1990-10-01), Eckholm et al.
patent: 4968417 (1990-11-01), Ahs
"Chesapeake-The West Point Pulp & Paper Mill", Brochure, 1986.

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