Apparatus for crushing or grinding of fibrous material, in particular drum refiner
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United States of America Patent
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-
Jul 7, 1992
Issued Date -
N/A
app pub date -
Dec 10, 1990
filing date -
Nov 5, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A drum refiner for grinding fibrous material, preferably chips, has an engine-driven drumshaped rotor which is placed on a horizontal shaft. The rotor has grinding surfaces extending parallel to the rotor axis and corresponding opposing grinding surfaces arranged on the housing. The grinding elements are placed symmetrically about at least one material feeds which are conveniently evenly distributed around the circumference of the rotor. The grinding surfaces begin parallel to the axis and contiguously increasing in inclination forming a grinding gap inclined towards the rotor axis at an angle of approximately 5.degree. to 45.degree., preferably 15.degree.. The second embodiment includes grinding surfaces contiguously increasing in inclination and ending with an angle of inclination of approximately 90.degree. to the rotor axis.
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