Method of making mechanical pulp

Details Method of making mechanical pulp Method of making mechanical pulp

D - Textiles, Paper

21

B

92/52

D21B 1/00 (2006.01) D21B 1/02 (2006.01) D21B 1/14 (2006.01) D21B 1/16 (2006.01)

Patent

CA 1315583

Abstract The making of mechanical pulp from softwood intended for coated light-weight paper (LWC), for uncoated cal- endered magazine paper (FSC) or the like is carried out in several steps as follows: a) impregnation (2) of chips with water in combination with complex-forming agent; b) refining-of the chips with double-disc refiner (3); c) fractionating screening (6-10) of the pulp; d) refining (12,14) of the screen reject in two steps, at high and, respectively, low concentration; e) screening (15) of the refined reject and combining with the accept from the screening (6-10) according to step c).

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