Patent ID: 6907995

Claim:
A wood chip screening method comprising: separating, in a separating apparatus, pin chips from a quantity of chips that are to be led to a subsequent process, providing a dosing apparatus comprising a rotatable device having a plurality of sections of adjustable size, and said rotatable device is adapted to adjust at least one of the rate of the rotation of said device and the size of said sections to control said desired amount of said pin chips and said desired rate of speed at which they are dosed among the chips that are to be led to the subsequent process, dosing a desired amount of the separated pin chips with the dosing apparatus at a desired rate of speed among the chips are to be led to a subsequent process so that a share of dosed pin chips relative to a total amount of chips does not exceed a desired value, while simultaneously directing pin chips in excess of said desired amount to a location different than said to be led to a subsequent process.