BATCH DRAINAGE CURVES FOR PULP CHARACTERIZATION .1. EXPERIMENTAL

An apparatus consisting of a modified batch-drainage tester, an electr onic balance, and a computer data-acquisition system is presented. The apparatus yields a full batch-drainage curve that represents dewateri ng on the forming table to the dry line. Experimental results provide valuable insights into drainage and can be used to characterize pulps, wires, and screens. In the second part of this paper, a comprehensive model is presented for sheet structure and flow during forming. The m odel provides a good predictive basis for research in this field.