Method and apparatus for removing impurities from pulverized or chipped material, especially wood chip and fiber materials
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United States of America Patent
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Apr 6, 1999
Grant Date -
N/A
app pub date -
Feb 14, 1996
filing date -
Feb 15, 1995
priority date (Note) -
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Abstract
The invention relates to a method and apparatus for screening pulverized or chip material, such as fibers or wood chips, free from impurities. The material to be screened is fed onto a roll set formed by a number of adjacent, essentially parallel rolls (1) and is brought to an advantageous movement with the help of the rolls (1), whereby material particles of highest density drift downward closest to the surfaces of the rolls and that the material fraction closest to the roll surfaces can escape the rolls via a gap (B) a width essentially larger than the gap width (A) of the preceding roll pairs.
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