In this investigation, the secondary fibers from old book papers were treated with a kind of commercial cellulase. The modifying conditions that cellulase works best as enzyme dosage, temperature, pH value,pulp consistency, the reaction time and the primary freeness of pulp were optimized. Investigative work showed that the better drainage of the pulp was obtained, and the physical strengths were improved in different degrees, including the breaking length and density, when the fibers were treated with adequate enzyme preparations. The enzyme treatment effects were evidenced by means of SEM technology.
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