纸浆纤维种类和性质对其凝胶点浓度的响应关系研究

Study on the Response Relationship Between the Types and Characteristics of Pulp Fibers and Their Gel Point Concentrations

关键词:  凝胶点浓度  加拿大标准游离度  保水值  拥挤数理论

Key Words:gel point concentration  Canadian Standard Freeness  water retention value  crowding number theory

摘要:本研究考察了漂白针叶木浆、漂白竹浆和漂白蔗渣浆3种纸浆纤维的沉降情况，研究了纤维种类和性质对其凝胶点浓度（C_g）的响应关系，为纸浆纤维悬浮液脱水过程中纤维网络的形成提供关键信息。结果表明，加拿大标准游离度（CSF）与C_g存在一定负相关关系；随着纤维保水值的增大，C_g总体上随之增大，并且保水值对C_g的影响受纤维种类的影响明显；随着纤维质均长度（L）的增大，C_g随之降低，当L增大至1.2 mm时，C_g基本不变；C_g的变化规律在较高长宽比（>20）下，可以采用拥挤数理论或有效介质理论解释，在较低长宽比时，2种理论均无法直接解释，还需要考虑纤维非物理性参数，如表面电荷等。

Abstract:The settlement of three pulp fibers （bleached softwood pulp， bleached bamboo pulp and bleached bagasse pulp） was compared to analyze the effects of fiber types and characteristics on the gel point concentration （C_g）， further to provide the key information of fiber network during the dewatering of pulp fiber suspension. The results showed that there was a negative relationship between the Canadian Standard Freeness （CSF） and the C_g. With the increase of fiber water retention value （WRV）， the C_g increased， and the effect of WRV on the C_g was affected by fiber type. With the increase of fiber length-weighted length （L）， the C_g decreased. When the L increased to 1.2 mm， the C_g basically remained unchanged. The change of C_g at a high aspect ratio （>20） could be well explained by the crowding number theory or the effective medium theory. However， both theories cannot directly explain the change of C_g at a lower aspect ratio， and non-physical parameters （such as surface charge） of fibers needed to be considered.