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US 4,061,283 AGranted
Refiner for grinding of fibrous material
AssigneeEscher Wyss Limited
InventorAlbrecht Kahmann
Life of this patent
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Abstract
The teeth of the stator and rotor of the refiner are each formed with a surface layer on the leading flanks which is harder than the end faces so as to maintain a sharp cutting edge. The hardness of the surface layer is at least 600 HB while the end face is of a hardness of from 280 to 320 HB.
Claims2
A refiner for grinding fibrous materials comprising
- a stator having a plurality of rib-shaped teeth of substantially rectangular cross-section;
- and
- a rotor having a plurality of rib-shaped teeth of substantially rectangular cross-section, said rotor being disposed in facing relation to said stator;
- each said tooth of said stator and said rotor having a leading flank disposed in the mutual direction of movement of said stator and rotor, an end face and a surface layer on said leading flank of a hardness greater than the hardness of said end face to maintain a sharp cutting edge during operation.
1 more element
Dependencies are inferred from the claim text.