| 摘要 |
PROBLEM TO BE SOLVED: To provide a treating technique of pulp capable of reducing lowering degree of pulp whiteness in beating treatment step and to provide a treating technique of pulp capable of reducing bleaching cost. SOLUTION: After a washing and dust-removing step of cooked pulp and before a final bleaching step, pulp suspension is mechanically mixed and pulp fiber is fibrillated by imparting high shearing force to a pulp fiber to lower unbeaten freeness of pulp after breaching treatment. Then, bleached pulp is beaten to a target freeness by a beating machine. Lowering degree of whiteness in the beating step can be minimized by reducing the difference between the unbeaten freeness and the target freeness and beating load is lowered to minimize the lowering degree of whiteness in the beating step. COPYRIGHT: (C)2004,JPO
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