酶预处理对漂白针叶木浆性能和打浆能耗的影响

Effect of Enzymatic Pretreatment of BSKP on Its Refining and Paper Properties

采用纤维素酶对漂白针叶木浆进行预处理,研究了酶预处理对浆料打浆性能和成纸强度性能的影响。结果表明,酶预处理后,漂白针叶木浆纤维的表面起毛且长度减小,细小纤维含量增加。对酶预处理后浆料进行PFI磨打浆,当打浆5000或10000转时,随着酶用量的增加,浆料游离度逐渐降低,表明酶预处理可降低打浆能耗,但打浆过程中纤维易被切断。打浆与适当的酶预处理相结合,可提高成纸强度性能,当打浆500、2000和5000转时,酶用量为0.01 U/g浆料的成纸抗张指数较未经酶预处理浆料分别提高了54.6%、60.3%和48.5%。

A cellulase was used to pre-treat bleached softwood kraft pulp （BSKP） in present study, the changes of fiber morphology, freeness of pulp in refining and paper properties were investigated, and the effects of enzymatic pretreatment on refining and paper properties were studied. The results showed that when the BSKP was pre-treated by the cellulase, fiber surface was of hairiness, fiber length decreased, and the fines content increased, which was similar to the effect of refining. When enzymatic pre-treated BSKP refined at PFI mill for 5000 r or 10000 r, the pulp freeness decreased with the enzyme dosage increasing. Enzymatic pretreatment could save refining energy significantly, but the pretreated fibers were easier to be cut in refining. Appropriate enzymatic pretreatment and refining could increase the physical strength of the paper. Comparing to the control samples, the paper tensile index improved by 54. 6% , 60. 3% and 48.5% when the pulps were pre-treated with enzyme dosage of 0. 01 U/g and the pulps were refined for 500 r, 2000 r, and 5000 r in PFI mill respectively.