Abstract The degree of interactions between fibers and the tendency of fibers to form flocs play an important role in effective unit operation in pulp and paper industry. Mechanical treatments may damage the structure of the fiber cell wall and geometrical properties, and ultimately change the fiber-fiber interactions. In this study, the gel crowding number, compressive and shear yield stress of fibrillated acacia pulps were investigated, and the results showed that the gel crowding number of the refined pulp samples ranged from 8.7 to 10.7, which were much lower than that of un-refined pulps. As the concentration increased, both the compressive yield stress P y {P_{y}} and shear yield stress τ y {\tau _{y}} of all suspensions increased accordingly, and the yield stress was found to depend on a power law of the crowding number. Moreover, the values of τ y / P y {\tau _{y}}/{P_{y}} were also examined and the variation of τ y / P y {\tau _{y}}/{P_{y}} became largely dependent on the fiber morphology and mass concentration.

中文翻译：

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原纤化相思浆纤维悬浮液的剪切和压缩屈服应力

摘要 纤维之间的相互作用程度和纤维形成絮凝物的趋势对制浆造纸工业的有效单元操作起着重要作用。机械处理可能会破坏纤维细胞壁的结构和几何特性，并最终改变纤维-纤维的相互作用。本研究考察了原纤化金合欢浆的凝胶拥挤数、压缩屈服应力和剪切屈服应力，结果表明精制浆样的凝胶拥挤数为8.7～10.7，远低于未加工的浆粕。精制纸浆。随着浓度的增加，所有悬浮液的压缩屈服应力 P y {P_{y}} 和剪切屈服应力 τ y {\tau _{y}} 都相应增加，并且发现屈服应力取决于幂律的拥挤数。而且，