PRODUCING HIGH YIELD PULP BY SCREENING PULP INTO FINE AND LONG FIBRE FRACTIONS

摘要

Improved chemimechanical, particularly chemithermomechanical, pulp (CTMP), is produced by defibrating or refining wood chips to produce pulp, and then screening the pulp and separating out at least 30% by weight of the incoming fiber suspension as a first long-fiber fraction, and also separating out a first fine-fiber fraction, screening the first fine fiber fraction a second time, and separating out a second long-fiber fraction which is combined with the first long-fiber fraction to form a long-fiber fraction of improved properties, and a second fine-fiber fraction of improved properties.