B - Operations – Transporting – 07 – B
Patent
B - Operations, Transporting
07
B
209/105
B07B 1/18 (2006.01) D21D 5/02 (2006.01)
Patent
CA 1138381
BFN 6684 PRESSURIZED SCREEN Abstract of the Disclosure A pressurized screen (10) particularly adapted for screening paper making pulp includes a cylindrical screen plate (20) mounted in a cylindri- cal casing (12) and defining with it an annular chamber (24) which receives unscreened pulp from which rejects are removed as the good pulp passes from the annular chamber through the screen plate. The axes (34,36) of the screen plate and the casing are offset with respect to each other, forming an enlargement (38) of the chamber which extends approximately from an inlet (28) into the annular chamber to a rejects outlet (30) which is diametri- cally opposite the inlet. A partition (40) in the chamber extends parallel to the axes of the casing and screen plate from a position opposite the inlet to a position above the rejects outlet. The parti- tion is spaced from the opposing inner and outer surfaces of the screen and casing, respectively, and a baffle (50) is provided which extends co-exten- sively with the partition and slopes helically down- wardly about the screen plate from the inlet to the rejects outlet and defines with the partition, the screen plate and a floor (22) of the chamber, a passage (52) of decreasing cross-sectional. area. Inlets (62,64) are also provided for adding dilution liquid to the passage upstream of the rejects outlet and a purging liquid just upstream of the rejects outlet.
355523
Black Clawson Company (the)
Gowling Lafleur Henderson Llp
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