机械精浆处理对竹材化学热磨机械浆性能的影响研究

Study on the Effect of Mechanical Refining on the Properties of Bamboo CTMP

关键词:  竹材化学热磨机械浆  精浆  纤维形态  湿部化学  纸张强度

Key Words:bamboo chemithermomechanical pulp  refining  fiber morphology  wet-end chemistry  tensile strength

摘要:以竹材化学热磨机械浆（Chemithermomechanical pulp, 简称CTMP）为原料，利用PFI磨浆机对其进行机械精浆处理，探讨了精浆处理对纸浆纤维形态、湿部化学特性及其成纸性能的影响。结果表明，机械精浆处理降低了纤维的平均长度，提高了细小纤维含量及其留着率，纸浆的溶解电荷量增加，但是纸浆的滤水性、Zeta电位和酸性基团含量下降；同时，精浆处理改善了纸张的抗张强度、耐破强度以及初始湿抗张强度。当纸浆打浆度由15 °SR提高到40 °SR时，纤维平均长度下降了0.13 mm，细小纤维含量及其留着率分别提高了1.0%和2.5%，纸浆的溶解电荷量增加了0.685 μeq·g-1，但其Zeta电位下降了-22.2 mV，成纸抗张指数和初始湿抗张强度分别提高了3.268 N·m·g-1和1.498 N·m-1。

Abstract:The effects of mechanical refining of bamboo chemithermomechanical pulp (CTMP) by PFI refiner on fiber morphology, wet-end chemistry and paper properties were discussed. The results showed that the mechanical refining decreased the average length of fiber, increased the content of fines and its retention, increased the dissolved charge of pulp, but decreased the drainability, Zeta potential and acid groups content of pulp. Meanwhile, the tensile strength, bursting strength and initial wet tensile strength of the paper were improved due to the refining treatment. When the beating degree of pulp increased from 15 °SR to 40 °SR, the average fiber length decreased by 0.13 mm, the content of fines and its retention increased by 1.0% and 2.5%, respectively, the dissolved charge of pulp increased by 0.685 μeq·g-1, but the Zeta potential decreased by -22.2 mV. The tensile index and initial wet tensile strength were increased by 3.268 N·m·g-1 and 1.498 N·m-1, respectively.