D - Textiles – Paper – 21 – D
Patent
D - Textiles, Paper
21
D
92/43
D21D 5/18 (2006.01) B02C 7/06 (2006.01) B02C 7/12 (2006.01) D21D 1/30 (2006.01)
Patent
CA 1102159
METHOD AND APPARATUS FOR CONTROLLING THE EFFECT OF THE CENTRIFUGAL FORCE ON THE STOCK IN PULP DEFIBRATING APPARATUS ABSTRACT OF THE DISCLOSURE A method and apparatus is provided for controlling the effect of centrifugal force on pulp stock while being ground in the grind- ing space of a defibrating apparatus defined between a pair of grinding discs which rotate relative to one another in a fluid en- vironment under superatmospheric pressure and corresponding elevated temperature. The grinding space includes a central portion, a first outwardly extending grinding space and a second outer grinding zone extending at an inclined angle from the first grinding zone. Pulp stock to be ground is introduced into the central portion and ac- celerated through the first and second grinding zones by centrifu- gal force generated by the rotating discs. The inclined grinding zone serves to split the centrifugal force into a vector perpen- dicular to the direction of flow of the pulp material and a vector aligned with the axial flow to reduce the accelerating force on the pulp grist in the direction of outward flow. By reducing the out- ward acceleration, the dwell time of the grist in the second grind- ing space is increased, resulting in optimum utilization of the en- tire grinding space for optimum refining efficiency.
321160
Reinhall Rolf B.
Marks & Clerk
Reinhall Rolf B.
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