Title
Modification of spruce sulphite pulp by cellulase treatment
Authors
DARIA POSHINA and EVGENY NOVOZHILOV

Received November 9, 2013
Published Volume 49 Issue 2 February
Keywords sulphite pulp, paper-grade pulp, dissolving pulp, cellulases, endoglucanases, pulp viscosity, mechanical properties, refining velocity

Abstract
Enzymatic treatment of different sulphite pulps with cellulases has been studied in this work. Endoglucanases were shown to beneficially alter the properties of both paper-grade and dissolving-grade pulps. In the case of the paper-grade pulp, the treatment with endoglucanase resulted in a considerable reduction of the pulp refining time without decrease in strength properties. While for the dissolving pulp, a viscosity decrease was achieved by cellulase treatments, which might be useful in upgrading pulp bleaching processes. The structure and composition diversity of sulphite and kraft pulps was found to define different employment of cellulases for their treatment.