Abstract The aim of this study was to evaluate changes in fibre properties with high (HC)- and low consistency (LC) refining of TMP and determine how these contribute to tensile index. Two process configurations, one with only HC refining and another with HC refining followed by LC refining were evaluated in three TMP mainline processes in two mills using Norway spruce. An increase in tensile index for a given applied specific energy was similar for all LC refiners in the three lines, despite differences in the fibre property profiles of the feed pulps. Compared with only HC refined pulps at a given tensile index, HC+LC refined pulps had greater fibre wall thickness, similar fibre length, strain at break and freeness, but lower light scattering coefficient, fibre curl and external fibrillation. The degree of internal fibrillation, determined by Simons’ stain measurements, was similar for both configurations at a given tensile index. The results indicate that the increase in tensile index in LC refining is largely influenced by a decrease in fibre curl and in HC refining by peeling of the fibre walls. Compared at a given tensile index, the shive content (Somerville mass fraction) was similar for both HC+LC and HC refining.

中文翻译：

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热机械纸浆高浓和低浓精炼中纤维特性的发展（第 1 部分）

摘要 本研究的目的是评估 TMP 的高 (HC) 和低稠度 (LC) 精炼对纤维性能的影响，并确定这些对拉伸指数的影响。在两个使用挪威云杉的工厂的三个 TMP 主线工艺中评估了两种工艺配置，一种仅采用 HC 精炼，另一种采用 HC 精炼，然后是 LC 精炼。尽管进料纸浆的纤维特性存在差异，但对于三个生产线中的所有 LC 磨浆机，对于给定的应用比能，拉伸指数的增加是相似的。在给定的拉伸指数下，与仅使用 HC 精制浆相比，HC+LC 精制浆具有更大的纤维壁厚、相似的纤维长度、断裂应变和游离度，但较低的光散射系数、纤维卷曲和外部原纤化。内部纤维化程度，由西蒙斯的染色测量确定，在给定的拉伸指数下，两种配置是相似的。结果表明，LC 精炼中拉伸指数的增加主要受纤维卷曲减少和 HC 精炼中纤维壁剥离的影响。与给定的拉伸指数相比，HC+LC 和 HC 精炼的碎屑含量（萨默维尔质量分数）相似。