Abstract: The effects of cellulase and xylanase treatment on beatability of mixed poplar P-RC APMP pulp were studied. The results showed that, compared with the pulp untreated by enzyme, the beatability of pulp treated by enzyme was improved, such as an increase of 1.0- 6.5 °SR in beating degree and a decrease of 10%-25% in beating energy consumption at the same beating degree. Breaking length, tearing index, bursting index and folding endurance of the pulp treated by cellulase were respectively improved by 18%,14%,16% and 100% at the same PFI revolution. Brightness of the pulp treated by xylanase was increased by 1.7 percent ISO,and physical strengths of the treated pulp were slightly improved.Effect of cellulase-treatment is better than that of xylanase-treatment in improvement of beatability, decreasing of beating energy consumption and intensification of physical strength. Effects of xylanase-treatment is better than that of cellulase-treatment in optical properties of pulp, such as improvement of brightness. Treated by enzyme,fiber structure was turned loose and limp, leading to strengthen the crosslinking among fibers.

Key words: cellulase, xylanase, P-RC APMP, beatability, enzyme-treatment