Apparatus for treating pulp in a pressurized state

Details Apparatus for treating pulp in a pressurized state Apparatus for treating pulp in a pressurized state

1990-08-24

1992-09-15

Jones, W. Gary

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With classifying, separating or screening of pulp

162251, 162261, 2104161, D21C 900

Patent

active

051475049

ABSTRACT:
An apparatus for treating a pulp suspension in a screening plant of a pulp mill wherein impurities are separated from defibered pulp by screening and/or cleaning, the cleaned pulp is thickened, the impurities are further treated in the screening plant by screening and defibering the accept fiber material for further screening and thickening and further impurities are removed from the screening plant after various screening stages, the apparatus including means for 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), Ekholm et al.
patent: 4968417 (1990-11-01), Ahs
"Chesapeake--The West Point Pulp and Paper Mill" (Brochure 1986).
"Ahlstrom Fiber Flow Ensovac" (Brochure 1987).

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