Refiner element pattern achieving successive compression before

Details Refiner element pattern achieving successive compression before Refiner element pattern achieving successive compression before

1989-09-05

1991-08-13

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

Cooperating comminuting surfaces

2412613, 241296, B02C 712

Patent

active

050390228

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%).

REFERENCES:
patent: Re29053 (1976-11-01), Cumpston, Jr.
patent: 407326 (1889-07-01), Boehnlein
patent: 1098325 (1914-05-01), Kihlgren
patent: 2654295 (1953-10-01), Sutherland
patent: 2968444 (1961-01-01), Jones
patent: 4269362 (1981-05-01), Berggren
patent: 4754935 (1988-07-01), Gullichsen

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