Grinding plate with angled outer bars

Details Grinding plate with angled outer bars Grinding plate with angled outer bars

1992-04-17

1993-01-26

Watts, Douglas D.

Solid material comminution or disintegration

Apparatus

Cooperating comminuting surfaces

241296, B02C 712

Patent

active

051816644

ABSTRACT:
A grinding plate (10) for the face (104) of a refiner disc (100) having a center and a substantially circular periphery (102), comprises a plurality of grinding plate segments (12) arranged side-by-side on the face (104) of the disc to form a substantially annular refining region (14) having an inner edge (22) near the center and an outer edge (24) near the periphery of the disc. Each plate segment (12) extends substantially radially and has a pattern of bars and grooves between bars, whereby material to be refined and steam produced during refining, can flow in the grooves in the general direction from the inner edge (22) toward the outer edge (24) of the refining region (14). The pattern includes an inner pattern (18) of substantially radially oriented inner bars (30) and inner grooves (32), substantially each inner groove having dam structure (34) for interrupting radial flow of material therethrough and an outer pattern (20) of outer bars (36) and outer grooves (38), defining flow channels (48) extending from the inner pattern (18) to the outer edge (24) of the plate segment (12) at an angle of at least about 45 degrees relative to the general direction of flow through the inner grooves (32). The flow channels (48) do not have surface dams.

REFERENCES:
patent: 183664 (1876-10-01), Grigg et al.
patent: 2654295 (1953-10-01), Sutherland
patent: 4023737 (1977-05-01), Leider et al.
patent: 4039154 (1977-08-01), Peterson
patent: 4237589 (1980-12-01), Boothe
patent: 4635864 (1987-01-01), Peterson et al.
patent: 5112443 (1992-05-01), Virving et al.

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