DESTABILIZATION OF COLLOIDAL WOOD RESIN CAUSED BY CELLULOSIC FIBERS IN THERMOMECHANICAL PULP SUSPENSIONS

The adsorption of glucomannans onto cellulosic fibers and its effects on the behavior of colloidal wood resin were studied. Resin extracted from mechanical pulp, glucomannans and other dissolved substances isol ated from a suspension of the same pulp were primarily used. Glucomann ans were readily adsorbed onto cellulosic fibers upon deacetylation. A s such, colloidal resin had little affinity for the fibers. Addition o f glucomannans to resin, prior to the addition of fibers, did not resu lt in co-deposition of resin and glucomannans onto fibers. However, ag gregation of resin occurred when all substances dissolved from TMP, in cluding glucomannans, were used instead of a relatively pure glucomann an. The primary mode of resin aggregation was most probably salt-induc ed coagulation taking place upon the adsorption of glucomannans onto f ibers.