EXTENDED DWELL REVERSE HYDROCYCLONE CLEANER
A reverse hydrocyclone cleaner (10) for the centrifugal separation of lightweight contaminants contained in a suspension of papermaking fibers is formed with an elongated hollow body (12) of circular cross section which converges uniformly from a first inlet end to a second apex end, in which the ratio of the length of the conical body to its largest diameter is at least approximately 20 to 1 and defines an included angle of less than 3 degrees.