Chip thickness vs. kraft pulping performance: experiments by multiple hanging baskets in batch digesters.


Differently screened chip samples were placed in baskets and were cooked inside industrial batch digesters.  These basket pulps were analyzed with regard to yield, delignification degree, rejects, and pulp strength.  Thickness screening was shown to be advantageous to conventional batch cooking and to full displacement cooking.  In both methods, the rejects could be cut in half by using thickness– ​screened chips.  Moreover, the SuperBatch cooking process, a modified full displacement process, resulted in 50​% less rejects than conventional cooking at the same kappa number.