酶预处理对纤维打浆性能的影响

Effect of Enzyme Treatment on the Performance of Fiber Refining

关键词:  漂白阔叶木浆  纤维素酶  PFI磨浆机  打浆能耗  纤维形态

Key Words:bleached hardwood pulp  cellulase  PFI refiner  refining energy consumption  fiber morphology

摘要:采用纤维素酶对漂白阔叶木浆进行预处理，研究了酶预处理工艺对纤维形态和打浆能耗的影响，并进一步分析浆料通过PFI磨打浆后的纤维形态变化，为酶预处理漂白阔叶木浆制备纤维素微纤丝（CMF）提供理论指导。结果表明，酶预处理并没有明显改变纤维形态，但经PFI磨打浆后的纤维更易被切断和分丝帚化，纤维润胀程度得以提高，且当酶用量8 U/g，打浆度达到50°SR和68°SR时，浆料的扭结纤维含量相比未经酶预处理的对照样分别减少了17.2个百分点和16.2个百分点，细小纤维含量分别增加了20.8个百分点和17.6个百分点；此外，酶预处理能显著降低磨浆能耗。当酶用量8 U/g时，打浆度达到50°SR和68°SR时，打浆能耗相比未添加酶的对照样分别节省了50%和33.3%。

Abstract:Cellulase was used for the pretreatment of bleached hardwood pulp, and the effects of enzyme pretreatment on fiber morphology and refining energy consumption were studied, and the changes of fiber morphology after PFI refining were further analyzed, thus providing the guidance for the preparation of cellulose microfibril (CMF)via enzymatic beating pretreatment of hardwood pulp.The results showed that the enzyme pretreatment did not significantly change the fiber morphology, but the fibers were more easily cut and shredded after PFI refining, the degree of fiber swelling was increased, and when the dosage of enzyme was 8 U/g and the beating degree reached 50°SR and 68°SR, the content of kinked fibers of the pulp was decreased by 17.2 percentage points and 16.2 percentage points, the amount of fines was increased by 20.8 percentage points and 17.6 percentage points respectively compared with the control samples.In addition, enzyme pretreatment could significantly reduce the refining energy consumption of the pulp.When the dosage of enzyme was 8 U/g and the beating degree reached 50°SR and 68°SR, the refining energy consumption of the pulp was reduced by 50% and 33.3% respectively compared with the control samples.