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Effect of Xylanase-Aided Refining on Wet-End Chemistry and Bleachability of Masson Thermomechanical Pulp

The Masson thermomechanical pulp (TMP) which was obtained from the first stage refiner was pretreated with xylanase followed by refining with PFI refiner. The impact of enzymatic refining on wet-end chemistry and bleachability of pulp were studied. The results showed that the enzymatic pretreatment could improve the wet-end chemistry properties and enhance the bleachability of masson TMP. In contrast to the control pulp sample, the beating degree, the zeta potential, the dissolved charge, the filler retention, and the sizing degree was increased respectively by 18.8%, 17.5%, 10%, 19.6%, and 18.8% at the xylanase dosage of 0.3 AXU/g (o.d. pulp); the tensile index, the tearing index and the brightness was increased by 2.3 N·m2/g, 0.19 mN·m2/g, and 1.3%ISO, respectively.