Procedure and apparatus for the sorting of wood chips

Details Procedure and apparatus for the sorting of wood chips Procedure and apparatus for the sorting of wood chips

1991-05-28

1992-07-28

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

With separation or classification of material

209 441, 209234, 209935, 241 80, 241 81, 241 28, B02C 1912

Patent

active

051335077

ABSTRACT:
A two-stage procedure is disclosed for sorting wood chips. The chips are directed to a gyratory screen in the first stage and to a disc screen in the second stage. The chip flow is divided in the first stage into four fractions of which the first fraction contains mainly oversized chips and is directed to a pin chipper, from which it emerges as suitable-sized chips and is directed back to the gyratory screen of the first stage. The second fraction contains acceptable sized chips and most of the overthick chips and is directed to the second or thickness screening stage. The third fraction consists mainly of acceptable chips and is directed to a pulping process, while the fourth fraction consists mainly of fine particles and is directed to a burning station. In the second or thickness screening stage the chip flow is divided into two fractions of which the rougher fraction comprises overthick chips and is directed via a rock and metal separating device into a slicing machine and then back to the first stage gyratory screen, while the finer fraction comprises acceptable chips and is passed directly to the pulping process.

REFERENCES:
patent: 3069101 (1962-12-01), Wexell
patent: 4376042 (1983-03-01), Brown
Screening of Pulpwood Chips for Quality and Profit, Paper Trade Journal, Apr. 30, 1979.

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