脱墨方法对废纸纤维结构特性的影响

对国内旧报纸进行了碱性脱墨和中性脱墨研究,通过纤维形态分析仪对脱墨前后废纸纤维形态进行了分析,利用Olympus倒置生物显微镜对脱墨体系油墨粒子及纤维分散行为进行了观察,采用FT-IR表征了脱墨前后废纸纤维结构特征,并用SEM观察了脱墨后废纸纤维表面结构.结果发现,脱墨方法对废纸纤维形态和结构都有明显的影响,旧报纸经脱墨后,纤维平均长度下降,细小纤维含量增加,扭结指数降低,且碱性脱墨的影响大于中性脱墨；中性脱墨后纤维形态结构保持相对较好；FT-IR分析发现,碱性脱墨后废纸纤维表面出现更多的羟基；SEM分析发现,碱性脱墨后废纸纤维表面存在较为清晰的“纤维损伤”,细纤维化现象比较明显.

Effect of Deinking Process on Wastepaper Fiber Properties

Two kinds of deinking processes,neutral deinking process and alkaline deinking process,were used for old newspaper(ONP) deinking.Olympus inverted biological microscope was used to analyze fiber and ink particles dispersing behaviors in the deinking system.Waste-paper fiber structures before and after deinking were characterized by FTIR.Scanning electron microscopy(SEM) was used to analyze fiber surface change after alkaline and neutral deinking.The results showed that the effect of different deinking process on the fiber morphology and structure is obvious.After deinking,the average fiber length and kink index decrease and fines increase.Influence of alkaline deinking on the fiber morphology is more significant than that of neutral deinking.Compared to alkaline deinking,the fiber morphology and structure after neutral deinking have few change,there is less hydroxyl group on the fiber surface and the neutral deinked fiber surface has less fibril and less damage.