The Effect of the Relative Viscosity of the Dissolving Pulp on the Sulphidation Resistance

Abstract

As a measure of the reactivity of dissolving pulp the sulphidation resistance (S. W.) of the mercerized cellulose at the same relative viscosity was investigated for the most part from the stand point of the relative viscosity (ηr) of their original pulp.The results were as follows : 1. The S. W. was mostly affected by the ηr of the original bleached pulp. The lower the ηr, the better the S. W.2. At the equal level of the vr of pulp, the S. W. was found better, accompanied with high α cellulose content of their original pulp.However, this effect was smaller than that of ηr.Yet, when the mercelized cellulose, prepared from the pulp of varied a cellulose content, the ηr remaining constant, was compared in the equal a cellulose content, the difference of the S. W. disappeared.3. However varied the yr of the unbleached pulp, the bleached pulp which was prepared at the same level of yr and a cellulose content were not different in their S. W. of mercelized cellulose.4. The over-cooked pulp which has low yr was not necessarily better in this reactivity.