D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
92/52
D21C 3/00 (2006.01) D21B 1/12 (2006.01) D21B 1/16 (2006.01) D21C 9/16 (2006.01)
Patent
CA 1320863
INTERSTAGE TREATMENT OF MECHANICAL PULP ABSTRACT OF THE DISCLOSURE A two-stage pulp refining system in which the fibrous material from the first stage refiner is in contact with an alkaline bleaching solution between refining stages at a temperature of 32-96°C and at a consistency of 15-25% on an oven dry basis. The material is then diluted and then pressed to a consistency of at least 20% and passes through the second stage refiner.
513097
Duncan William L.
Lowrie Leonard E.
North Pacific Paper Corporation
Osler Hoskin & Harcourt Llp
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