Method for screening paper fiber stock

Details Method for screening paper fiber stock Method for screening paper fiber stock

1976-05-14

1978-08-08

Halper, Robert

Classifying, separating, and assorting solids

Sifting

Feeding and discharging

209273, 209379, B07B 120

Patent

active

041055438

ABSTRACT:
A method of screening paper fiber stock incorporating a screen member having generally circular perforations and a rotor supporting vanes movable in the supply chamber, the rotor vanes are spaced from the screen member by a substantial distance (3/16"-1/2") to establish a tubular layer of stock of corresponding radial thickness adjacent the screen member, the rotor is operated at high speed to develop strong hydraulic shear forces in the tubular layer of stock causing tangential orientation of predominantly two-dimensional contaminant particles, and ribs on the inlet side of the screen member cause the stock to be continuously recirculated in the supply chamber to prevent undue increase in the consistency of the stock in the tubular layer, thereby enabling the screen to operate effectively at high capacity and high stock consistencies.

REFERENCES:
patent: 1856176 (1932-05-01), Trimbey
patent: 2900077 (1959-08-01), Sandison
patent: 2975899 (1961-03-01), Cannon
patent: 2983379 (1961-05-01), Cram
patent: 3080696 (1972-08-01), Morin
patent: 3363759 (1968-11-01), Clarke-Powder
patent: 3394809 (1968-07-01), Hunter
patent: 3581893 (1971-06-01), Rich
patent: 3581903 (1971-06-01), Holz
patent: 3586172 (1971-06-01), Hunter
patent: 3726401 (1973-04-01), Bolton
patent: 3849302 (1974-11-01), Seifert

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