| Abstract:In this paper, the influence of laccase-histidine on OCC fiber proterties was studied both in laboratory and mill. The laboratory results showed that when the amounts of laccase and histidine were 0.90 U/g and 1.0% respectively. The dry and wet ring crush index of papersheet increased by 22.9% and 30.3% compared with the control sample. Furthermore, the pilot test results also showed that when the amounts of laccase and histidine were 0.225 U/g and 0.10% (on oven dried pulp), the dry and wet ring crush index of papersheet increased by 14.9% and 26.4%, the longitudinal and cross tensile index increased by 8.0% and 10.7%, and brusting index increased by 16.4%, correspondingly. Besides, fibrillation was greatly developed and water retention value (WRV) increased by 37.5%. At the same time, the average pore size of fiber wall, specific surface area and carboxy group content increased by 1.1%, 5.1% and 35.4% respectively. |
