PROCEDURE FOR IMPROVING PROPERTIES OF MECHANICAL WOOD PULPS

摘要

21 Mechanical pulps in the form of RMP or, more preferred, TMP, of improved properties suitable for substitution for chemical pulp, especially in newsprint furnish, is obtained in a substantially pollution-free process by subjecting the mechanical pulp to chemical treatment using sodium sulphite solution. This treatment results in increased wet stretch and stress-strain properties while retaining high drainage and avoiding substantial yield loss.