Two stage rotary pulp screening device

Classifying – separating – and assorting solids – Sifting – With liquid treatment

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Details

209306, 210405, 210413, B01D 2942, B07B 120

Patent

active

047494751

ABSTRACT:
A two stage rotary pulp screening device has two screens in line within a single chamber. The accepts from the second screen can be recirculated to the primary screen as an integral part of the device. The improvement comprises a second screen within the chamber, downstream and co-axial with the primary screen and having a diameter at least as large as the primary screen, the impeller extends axially in a downstream direction within the second screen and has a body shape with a circular axial cross section whose diameter increases from the outlet end of the primary screen in the downstream direction, second impeller blades radiating from a downstream portion of the impeller for the length of the second screen, and second pulp stock discharge outlet from exterior of the second screen.

REFERENCES:
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patent: 868341 (1907-10-01), Holden
patent: 1134304 (1915-04-01), Westbye
patent: 1537691 (1925-05-01), Priem
patent: 3394809 (1968-07-01), Hunter
patent: 3399772 (1968-10-01), Salomon
patent: 3545621 (1970-12-01), Lamort
patent: 3713536 (1973-01-01), Hooper
patent: 4268381 (1981-05-01), Hooper
patent: 4642189 (1987-02-01), Hooper

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