B - Operations – Transporting – 07 – B
Patent
B - Operations, Transporting
07
B
209/105
B07B 1/00 (2006.01) B01D 29/00 (2006.01) D21D 5/02 (2006.01)
Patent
CA 1238604
A B S T R A C T A rotary pulp screening device of the vertical type is disclosed having a high screening efficiency and high capacity. The screen provides a streamline flow of pulpstock, and aims to supply a fairly constant flow of pulp through the screen from top to bottom, thus utilizing the full height of the screen. The screening device includes a cylindrical housing with a vertical cylindrical screen therein, a rotary impeller mounted for rotation within the screen, the impeller having a body whose top is substantially level with the disc ring and bottom is adjacent the lower end of the cylindrical screen, the body having a shape with circular axial cross section from the top to the bottom, whose diameter increases from the top to the bottom thus leaving a larger annular space at the top, and impeller blades radiating from at least a portion of the body of the impeller and extending to within a short distance from the screen for the height of the screen. The improvement comprises at least one substantially frusto-conical shaped baffle concentric with the body of the impeller, extending down from the top of the screen- adapted to divide flow of pulp stock entering the screen- ing device, and direct the divided flows to different vertical locations on the pulp screen.
468118
Fetherstonhaugh & Co.
Uniweld Inc.
LandOfFree
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