PARTICLE SIZE DISTRIBUTIONS OF FINES IN MECHANICAL PULPS AND SOME ASPECTS OF THEIR RETENTION IN PAPERMAKING.

In the reported experiments, particle size distributions of mechanical pulp fines have been determined by automated image analysis, and the technique is illustrated by the results of a series of experiments designed to determine what effect various conditions of sheet formation have on the size distributions of unretained fines. The range of values for the average longest linear dimension (ALLD) of fines in this work was 16-25 mu m, and the …