Abstract
The hydrophobicity characteristic of lignocellulosic fibers is an advantage for some paper or paperboard. In this work, the unbleached kraft pulp was treated by laccase and lauryl gallate (LG). The sizing degree, water retention value (WRV) and the wet strength of the treated fibers were studied. The optimal process conditions such as the beating degree of pulp, the drying time and drying temperature of the resulting paper for improving the sizing degree and wet strength were discussed. The results showed that the sizing degree of pulp with beating degree of 25 °SR could be increased by 4.6 times after laccase/LG treatment. The optimal drying time and temperature of the resulting handsheet was 30 min and 105°C for improving the sizing degree of pulp, respectively. The water retention value of pulp with beating degree of 25 °SR decreased. The wet/dry tensile index value of the treated pulp increased after laccase/LG treatment. The high drying temperature (above 105 °C) of handsheet helped to enhance the wet strength of pulp.
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