Method of refining cellulosic fibrous material with successive e

Details Method of refining cellulosic fibrous material with successive e Method of refining cellulosic fibrous material with successive e

1990-08-23

1992-02-04

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Simultaneous mechanical defibration and chemical treatment

162 28, 162 57, 241 28, B02C 712, D21B 116, D21B 134

Patent

active

050857355

ABSTRACT:
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.degree.-30.degree. (preferably 5.degree.-20.degree.) 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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patent: 4635864 (1987-01-01), Peterson et al.
patent: 4754935 (1988-07-01), Gullichsen

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