De-ashing

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.

RotoWash RW: compact/flexible de-ashing with efficient fiber recovery

RotoWash RW is a multi-use machine ideal for de-ashing pulp and recovering fiber from filtrates and sludges. The RotoWash can also be used as a protection filter for shower nozzles and similar devices. Its design is based upon a well-proven pressure screen with electron-beamed hole basket and optimized rotor and tip design.

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