The SpeedWasher SW: efficient and selective de-ashing
The ANDRITZ SpeedWasher removes inorganic material (filler and coating pigments) from a fiber suspension. The machine has an endless wire running at a speed of up to 1,000 m/min. The de-ashing effect comes from the one-sided dewatering of the fiber suspension between a forming roll and the wire. Pigments are enriched in the filtrate, which is de-aerated and discharged through spin tubes. The thickened, de-ashed stock builds a fiber mat, is doctored off the rolls, and is transported out of the machine with a screw conveyor. Machine configurations with one or two headboxes are available.