【摘要】 在传统化学机械法制浆之前,用木聚糖酶预处理木片获得生物化学机械浆(B io-CMP)。在预处理阶段,木聚糖酶能水解纤维细胞壁上的部分木聚糖,从而引起木片中部分木聚糖的溶出,疏松了木片结构。由于阔叶木纤维细胞壁的初生壁和次生壁S1层具有较高浓度的半纤维素,阔叶木半纤维素的主要组分是木聚糖,因此在后续的盘磨磨浆过程中,纤维之间的分离更多地发生在结构疏松的初生壁P层和次生壁的S1层,而不是传统CMP磨浆过程中的胞间层(ML),使得更多的微细纤维能够暴露在纤维的表面。更多还原

【Abstract】 The fiber separation in traditional chemi-mechanical pulping(CMP) occurs in the middle lamella(ML) layer due to the reaction between the chemicals and lignin in the chemical pretreatment stage.Thus,the fiber surfaces are covered with quite a lot of lignin and extractives,and those hydrophobic materials will prevent the bonding between the fibers.It was confirmed in this paper that when the wood chips were pretreated with xylanase prior to the CMP process,some xylan in the primary and secondary walls of the fiber cells was removed,which led the fiber structure to loosing.In the subsequent refining process of Bio-CMP,the fiber separation occurred mainly in the primary wall and secondary wall rather than the middle lamella because much xylan dissolved in the primary wall and secondary wall for hardwood,it created more microfibrills on the fiber surfaces after refining.Therefore,those fibers with much carbohydrate and less lignin and extractives on the surface could benefit to the interfiber bonding.更多还原