不同类型飞刀对纤维打浆性能的影响

Influence of Different Types of Blades on the Beating Performance of Fibers

关键词:  Valley飞刀  打浆  纤维形态  纸张性能

Key Words:Valley blades  beating  fiber morphology  paper properties

摘要:本研究以未漂白硫酸盐针叶木浆为原料，探讨了Valley飞刀对打浆前后的纤维形态及纸张性能的影响。结果表明，不同类型飞刀对纤维打浆性能影响显著。在相同打浆条件下，随着齿宽的增加，飞刀对纤维的揉搓作用增强，加剧了纤维形态变化，纤维分丝帚化现象更明显，从而加快打浆度和纸浆纤维保水值的提升。当浆浓提高时，飞刀类型对纤维打浆效果的影响减弱。在同一浆浓、相近打浆度下，不同类型飞刀的纸张性能差异较小。其中浆浓为2.0%时，齿宽为2 mm的2^#飞刀处理的纸张性能最佳，其纸张在打浆度为56 °SR时的抗张指数、耐破指数和撕裂指数分别为104 N·m/g、6.93 kPa·m²/g和11.5 mN·m²/g。

Abstract:In this study， unbleached kraft softwood pulp was used to explore the effects of Valley blades on the fiber morphology and paper properties before and after beating. The results showed that different types of blades had a great effect on the beating performance of fiber. Under the same beating conditions， with the increase of bar width， the rubbing effect of blade on fibers was enhanced， which aggravated the change of fiber morphology， and the phenomenon of fiber fibrillation was more obvious， which accelerated the improvement of beating degree and water retention value of pulpfibers. When the pulp consistency increased， the influence of blade type on the beating effect was weakened. Under the same pulp consistency and similar beating degree， paper properties of different types of blades exhibited minor variations. Paper properties of the 2^# blade with 2 mm bar width were optimal when the pulp consistency was 2.0%. When the beating degree was 56°SR， the tensile index， burst index and tearing index were 104 N·m/g， 6.93 kPa·m²/g and 11.5 mN·m²/g， respectively.