Solid material comminution or disintegration – Processes – With classifying or separating of material
Patent
1989-05-30
1991-03-19
Rosenbaum, Mark
Solid material comminution or disintegration
Processes
With classifying or separating of material
241 28, 241 81, 209 441, 209234, B02C 1912
Patent
active
050003909
ABSTRACT:
A wood chip sizing apparatus, based on the thickness dimension, which includes a gyratory screen system (16) comprising three separate screens (18, 22, 26) which produces a total of four fractions, one fraction (20) comprising substantially all overthick chips, another fraction (24) comprising both overthick chips and accepts, another fraction (28) comprising substantially all accepts, and another fraction (30) comprising substantially all unders. Fraction (20) is moved directly to a chip slicer (52) which reduces the size of substantially all the chips to accepts. Fraction (24) is directed to a second screening station (42) which separates fraction (24) into two further fractions (44 and 46), one of which (44) comprises overthick chips, and the other of which (46) comprises accepts. The overthick chips (fraction 44) are applied to the chip slicer (52). Fraction (30) is processed to produce products other than pulp, while fractions (28) and (44) and the chips from the chip slicer (52) are moved to storage or a digester for pulping.
REFERENCES:
patent: 4376042 (1983-03-01), Brown
J. V. Hatton, Chip Quality Evaluation, Pulp Paper Can., Jun. 1976, pp. T99-T103.
J. V. Hatton, Screening Mill Chips for Sizeable Savings, Pulp Paper Can., Mar. 1977, pp. T57-T60.
J. V. Hatton, Screening of Pulpwood Chips for Quality and Profit, Paper Trade Journal, Apr. 1979, pp. 25-27.
Rosenbaum Mark
Weyerhaeuser Company
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