Pressure-assisted centrifugal grinding

Details Pressure-assisted centrifugal grinding Pressure-assisted centrifugal grinding

D - Textiles, Paper

21

B

92/55

D21B 1/00 (2006.01) B02C 19/00 (2006.01)

Patent

CA 1239824

11 ABSTRACT OF THE DISCLOSURE A method and apparatus for grinding woodchips into pulp provides an internal grinding surface of circular section defining a cavity in which a rotor rotates. The rotor has a pocket extending to the grinding surface from an inlet spaced inwardly from the grinding surface, and the rotation of the rotor gives rise to centrifugal force urging woodchips against the surface, the woodchips entering at the inlet. The woodchips form a compact plug of material filling the pocket adjacent the surface, and the woodchips are ground to pulp and then removed from the surface to a discharge. A pressure differential is placed across the plug of material in the sense to urge the woodchips in the plug more strongly against the grinding surface, so that the woodchips can press with a satisfactory grinding force against the surface without requiring an excessive rotational speed.

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