冰冻对纤维角质化的影响

Effects of freezing on fiber hornification.

为了解冰冻对纤维的影响,该文研究了冰冻处理后纤维形态、保水值及性能的变化.研究结果表明,硫酸盐浆、酸性亚硫酸盐浆、氢氧化钠浆经冰冻处理后,浆料的保水值都明显下降,商品硫酸盐浆的游离度大幅度升高,抄造成的纸张紧度降低,光散射系数升高,抗张指数、耐破指数、耐折度明显下降;纤维的长度基本没有变化,弯曲指数和扭结指数有所增加,表明纤维发生了角质化;并提出了冰冻引起纤维角质化的机理.

To better understand the influence of freezing on fiber properties, the authors evaluated the changes in water retention value and handsheet properties of pulp fibers which had been frozen. The results indicated that freezing reduced the water retention values of all the three pulps studied, including kraft, bisuplphate and soda pulps. The freezing also changed the physical characteristics of market kraft pulp fibers. For example, the pulp freeness, light scattering coefficient, tear index, curl index and kink index were remarkably increased, while the tensile index, burst index, sheet density and folding endurance were significantly decreased. There was no significant changes in fiber length. These results whowed that freezing can cause fiber hornification, and the mechanism of it was discussed.