Two stage rotary pulp screening device

Details Two stage rotary pulp screening device Two stage rotary pulp screening device

D - Textiles, Paper

21

D

209/105

D21D 5/22 (2006.01) B01D 29/11 (2006.01) D21D 5/02 (2006.01)

Patent

CA 1316145

ABSTRACT OF THE DISCLOSURE 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.

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