Apparatus for screening paper fiber stock

Classifying – separating – and assorting solids – Sifting – Feeding and discharging

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209273, 209306, 209379, B07B 120

Patent

active

039705480

ABSTRACT:
Screening apparatus for paper fiber stock and other fiber suspension is especially designed to handle relatively suspension containing stringy material. A perforate screen cylinder forms the outer wall of the supply chamber for the stock to be screened, and a rotor operates in the supply chamber and includes vanes which travel in spaced relation with the inner wall of the screen cylinder. These vanes are supported on the rotor hub by imperforate arms of substantial axial extent which act as propeller blades to maintain a high rate of circulation of the stock within the supply chamber and also to direct the stock toward the reject collecting chamber from which stock is continuously discharged at a high volumetric rate approaching or equal to the rate of discharge of accepted stock. Helical ribs on the inner surface of the screen cylinder aid in channeling the flow of reject-containing stock toward the reject outlet.

REFERENCES:
patent: 2975899 (1961-03-01), Cannon
patent: 3410409 (1968-11-01), Rittenhouse
patent: 3726401 (1973-04-01), Bolton
patent: 3759392 (1973-09-01), Syrjanen

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