磨浆过程中P-RC APMP浆料及纤维特性变化的研究

对在P-RC APMP制浆中,磨浆程度对最终浆料及纤维特性的影响进行了探讨.通过对浆料纤维的筛分分析和纤维质量分析表明,在P-RC APMP制浆过程中,随着磨浆程度的增加,浆中长纤维组分含量下降,细小纤维含量增加,纤维粗度和纤维平均长度减小,同时纤维的卷曲和扭结程度有所增加,纤维的柔软度增加.SEM观察发现,随着磨浆的进行,纤维彼此分离并发生不同程度的细纤维化,同时伴随着纤维细胞壁的破损.提高磨浆程度,纤维细纤维化程度加强,所得纸页表面平滑,具有较少的空隙,纸页中具有较多的细小纤维和纤维碎片.增加磨浆程度,浆料强度提高,这是由于纤维细纤维化程度的提高及由此引起的纤维柔软度的增加而最终导致纤维结合力提高.

Changes of Pulp Properties and Fiber Characteristics in P-RC APMP Pulping

The change of pulp properties and fiber characteristics during the refining in the P-RC APMP process was investigated in this paper. The results showed that increasing the beating degree could reduce the long- and middle- fiber fraction and increase fines fraction. At the same time, the average fiber length and fiber coarseness descended gradually, while the curl index, kink index of the fibers and softness of the fibers increased. The results from SEM observation illustrated that during the refining, with the defiberation and fibrillation, many fibers were cut, broken and split. The higher beating degree, the higher fiber fibrillation extent, softness and inter-fiber bonding ability the fiber had. With increasing of beating degree, the surface of handsheets became more smooth and the porosity on the paper surface reduced. The pulp strength properties developed with beating degree increasing, it was mainly ascribed to the fiber fibrillation.