Paper making machine

Application

ZNW series 2-stage pulp washer(pulping machine) is a state of art facility for paper stock thickening. It combines gravity-filter and vacuum thickener in one unit. It is used for washing and thickening waste paper stock as well as other pulps, especially suitable for washing waste paper deinked pulp. By this machine, paper stock at consistency 0.55% can be thickened to 8% and the best result can be achieved in removing ink particles sized 1~100 microns.

Structure feature

ZNW series 2-stage pulp washer consists of cylinder wire thickener, vacuum drum thickener and intermediate tank. The cylinder wire thickener consists of cylinder cage, pulp inlet trough, vat, frame, shower and drive, etc. The vacuum drum thicker consists of wire support cylinder, vat, press roll and loading device, frame, shower and drive etc.

The pulp at consistency 0.55% enters the vat of wire cylinder from the inlet trough and carries on the rotating wire cylinder at low speed. Stock water is draining as effect of difference level between inside and outside of cylinder. The difference level can be adjusted for yielding required stock consistency. The pre-thickened pulp flows into the vat of the vacuum drum thickener via the intermediate tank, where the pre-thickened stock is filtering under vacuum generated by drop leg. As effect of vacuum, fiber mat on wire is getting thicker and thicker, consistency is gradually increasing. As continued, the filtered stock is pressed on drum by press roll and finally dropped into the tank. The filtrate by vacuum is discharged directly from vacuum drum.

Thanks to combination of gravity dewatering by cylinder wire and vacuum dewatering, dewatering intensity is gradually increased, the ink particles sized 1~100mm are effectively filtered by fully utilize of the hydrophobicity difference between the ink particles and fiber.

Simple structure, easy, safe and reliable in operation.

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