Classifying – separating – and assorting solids – Sifting – Combined type
Patent
1980-05-02
1983-05-17
Hill, Ralph J.
Classifying, separating, and assorting solids
Sifting
Combined type
209273, 209306, B07B 120
Patent
active
043839185
ABSTRACT:
Apparatus for screening a suspension of liquid, paper making fibers and undesirable rejects to remove a substantial portion of the rejects therefrom comprise a cylindrical screening member provided with circumferentially extending screening slots in the range of from greater than 0.008 inch to approximately 0.030 inch in width, and bars projecting from the inlet face of the screen and cooperating with rotating foils for creating a field of high intensity, fine scale turbulence adjacent the inlet face of the screen. The paper making fibers and other particles of elongated thin shapes can pass through the screening slots, but relatively chunky reject particles, which would pass through the larger openings of conventional paper making screens, are rejected without fractionation of the paper making stock or appreciable variation in the consistencies of the feed, accepts and reject flows. The apparatus has special utility in a two-stage screening system when installed immediately ahead of the headbox of a paper machine, and also as the primary screen in a waste paper stock preparation system.
REFERENCES:
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patent: 3849302 (1974-11-01), Seifert
patent: 3873410 (1975-03-01), Chupka
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patent: 4155841 (1979-05-01), Chupka et al.
Chupka David E.
Seifert Peter
Hill Ralph J.
The Black Clawson Company
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