In the papermaking industry, the significance of enzymes as biotechnological catalysts is now recognized. In this study, five cellulase formulations were used for fibre modification. The number of PFI revolutions decreased by about 50% while achieving the same freeness value (decrease in CSF by 200 ml) with the enzymatic pretreatment. The physical properties of handsheets were modified after enzymatic pretreatment followed by PFI refining. A slight decrease in tear strength was observed with enzymes C1 and C4 at pH 7 while the most decrease in tear was observed after C2, C3, C5 treatments. C1 and C4 which had xylanase activity improved paper properties, while other enzymes had a negative impact. Therefore, the intricate balance between cellulolytic and hemicellulolytic activity is the key to optimizing biorefining and paper properties. It was also observed that C1 impact was dependent on pH, which supports the importance of pH in developing an enzymatic strategy for refining energy reduction.%在造纸工业中,酶在生物技术催化剂中的重要性已经得到公认.此次研究选取了五种商业酶来改性纤维.结果显示,经过酶预处理后,浆料达到相同的游离度(下降200ml)所消耗的P F I磨浆机转数大约是未经处理的一半.并且,经过酶预处理及PFI磨浆后,手抄片的性能也会发生改变.最终得出结论,纤维经过酶C1和酶C4在pH=7下预处理后,其手抄片的撕裂强度略微下降.而经过酶C2、酶C3和酶C5预处理后,撕裂强度下降最明显.具有木聚糖酶活性的酶C1和酶C4预处理浆料后能够改善纸张性能,但是其他酶对纸的性能产生了负面影响.因此,水解纤维素活性和水解半纤维素活性之间复杂的平衡是优化生物质精炼和纸张性能的关键.同时发现,pH对酶C1的影响很大,这表明控制pH在开发减少磨浆能耗的酶策略中的重要性.
展开▼
