METHOD FOR IMPROVING THE DISCOLORATION RESISTANCE OF PULP AND PULP IMPROVED IN DISCOLORATION RESISTANCE

摘要

Provided are a method for improving the discoloration resistance of pulp which method is a general-purpose technique applicable to all kinds of pulps and which method is characterized by short treatment time, remarkable and persistent discoloration-inhibiting effect, and friendliness to the environment, and pulps remarkably improved by the method in discoloration resistance. The method comprises adding one or more members selected from among reducing agents, peroxides and hydrogen-donating organic compounds to one or more members selected from among preliminarily bleached, mechanical, semichemical, chemical, and waste paper pulps, and irradiating the resulting mixture with ultraviolet and/or visible rays. According to the method, the discoloration resistance of pulp can be remarkably improved.