Refiner element pattern achieving successive compression...

B - Operations – Transporting – 02 – C

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B02C 7/12 (2006.01) D21D 1/24 (2006.01) D21D 1/26 (2006.01) D21D 1/30 (2006.01)

Patent

CA 1329033

ABSTRACT OF THE DISCLOSURE A refiner for producing mechanical pulp has greater spacing between bars of the refiner grinding elements than is conventional. The grooves between the bars have a sloping bottom, making an angle of about 1-30° (preferably 5-20°) with respect to a straight line between the bars. The width of the grooves is about 10-50 mm. The relative rotation of the refiner elements (whether disks, cylindrical, or conical) with respect to each other results in sequential refining: a moving tension field, with successive compressions before impacts, and expansions, achieving increased fiber flexibility, more fiber rolling motion, and less fiber cutting. Pulp produced has increased fiber flexibility yet maintains a high content of long fibers, and higher refiner capacity also ensues. Also, the refiner of the invention can be used to mix treatment chemicals -- such as bleaching chemicals in liquid form -- into kraft pulp at high consistency (e.g. about 30-55%).

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