Method and apparatus for feeding a conical refiner

Details Method and apparatus for feeding a conical refiner Method and apparatus for feeding a conical refiner

1989-06-29

1991-01-22

Rosenbaum, Mark

Solid material comminution or disintegration

Processes

Wood and similar natural-fibrous vegetable material

162 52, 241 37, 241247, 2412592, 2412611, B02C 1912

Patent

active

049864807

ABSTRACT:
Mechanical cellulosic fibrous material pulp (mechanical pulp to produce paper products) having lower freeness, and enhanced light scattering properties, tensile and tear strengths, for a given energy input, is produced by force feeding a refiner. Using a progressive compacting plugscrew, cellulosic material (e.g. wood chips) is fed to the refiner inlet at a rate greater than the transporting capacity of the refiner (e.g. about 10-40% greater). The refiner preferably is a low frequency conical refiner with steam removal at the grinding area between the conical refiner elements. The production rate is regulated by sensing the axial force on the refiner rotor and controlling the spacing between the refiner elements in response to the sensed axial force. The screw has a compaction ratio of at least 3/1 for wood chips and 6/1 for pulp, and is rotated at about 6-10% the speed of rotation of the refiner rotor.

REFERENCES:
patent: 2573321 (1951-10-01), Ernst
patent: 3327952 (1967-06-01), Rosenfeld
patent: 4059237 (1977-11-01), Mannstrom
patent: 4082233 (1978-04-01), Reinhall
patent: 4283016 (1981-08-01), Reinhall
patent: 4401280 (1983-08-01), Reinhall
patent: 4457804 (1984-07-01), Reinhall
patent: 4700900 (1987-10-01), Rowland
patent: 4754935 (1988-07-01), Gullichsen
patent: 4801099 (1989-01-01), Reinhall

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