Pulper for circulating a fibrous stock suspension
AssigneeVoith Patent GmbH
InventorOliver Lüdtke
Life of this patent
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Abstract
A pulper for circulating a fibrous stock suspension. The pulper includes at least one screen, having a screen surface which is provided with screen openings, and over which a rotor passes. The rotor is formed by a rotor head, to which a plurality of rotor blades are attached on the outer circumference. The rotor circle of the screen, which is passed over by the rotor wings, includes a plurality of bar-shaped elevations. In the process, pulping is to be improved, while wear is to be minimized, in that the angle of intersection between the working edge of the rotor blades pointing in the direction of rotation and the shear edge of the elevations pointing counter to the direction of rotation does not decrease radially outwardly.
Claims20
A pulper for circulating a fibrous stock suspension which is present in a vat, comprising:
- at least one screen including a screen surface with a plurality of screen openings therein, the at least one screen further including a plurality of bar-shaped elevations, each elevation defining a shear edge that points in a first direction;
- a rotor that is configured to pass over the screen surface, the rotor being formed by a rotor head and a plurality of rotor blades attached to the rotor head, each rotor blade defining a working edge that points in a second direction which is opposite to the first direction, the second direction being a direction of rotation of the rotor,
- wherein an angle of intersection between the working edge of each rotor blade and the shear edge of each elevation remains constant radially outwardly, at least in sections, and/or increases, at least in sections, the angle of intersection being between 80° and 120°.
Dependencies are inferred from the claim text.