Method and apparatus for removing impurities from pulverized or

Details Method and apparatus for removing impurities from pulverized or Method and apparatus for removing impurities from pulverized or

1996-02-14

1999-04-06

Nguyen, Tuan N.

Classifying, separating, and assorting solids

Plural, diverse separating operations

Sifting and stratifying

209673, B07B 1305

Patent

active

058906002

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.

REFERENCES:
patent: 4102502 (1978-07-01), Vaplon et al.
patent: 5058751 (1991-10-01), Artiano
patent: 5386914 (1995-02-01), Eramaja et al.
Publication "Classifarmer for surface" from Sunds Defibrator. Year 1994.

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