酶处理对混合杨木P-RC APMP浆打浆性能的影响

Effects of Enzyme-treatment on Beatability of Mixed Poplar P-RC APMP

探讨了纤维素酶、木聚糖酶处理对混合杨木温和预处理和盘磨化学处理的碱性过氧化氢机械浆(P-RC APMP)的打浆性能和打浆能耗的影响。结果表明:与未经过酶处理浆相比,纤维素酶和木聚糖酶处理可明显改善纸浆的打浆性能和降低打浆能耗,纸浆打浆度提高1.0～6.5°SR,或在相同打浆度下打浆能耗降低10%～25%。纤维素酶处理浆裂断长提高18%,撕裂指数提高14%,耐破指数提高16%,耐折度提高100%。木聚糖酶处理纸浆白度提高1.7度(ISO),纸浆物理强度略有上升。纤维素酶在改善纸浆打浆性能、降低打浆能耗和提高物理强度方面好于木聚糖酶,木聚糖酶在改善纸浆光学性能方面优于纤维素酶。酶处理可以使纸浆纤维结构变得疏松柔软,从而增强纤维间的交织能力。

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.