Polymer enhanced brownstock washing: Mill trial

Cationic polymer was applied onto fiber pads supported on brownstock vacuum drum washers in an effort to increase displacement washing efficiency. Sodium concentration, liquor conductivity, and lignin (VIS absorbance) at the feed and for pulp samples taken off the washer drum were measured as a function of polymer treatment concentration. Washing was characterized by the relative displacement ratio, RDR, defined as the displacement ratio of the …