填料和助剂预絮聚对填料留着和成纸抗张强度的影响

Influence of Pre-flocculation of Filler and Wet End Additives on Filler Retention and Paper Strength

利用两个纸厂的浆料,在填料和助剂预絮聚工艺条件及模拟实际生产工艺条件下进行实验,研究了不同工艺条件下,手抄片中细小纤维含量与纸张灰分、抗张强度之间的关系,通过扫描电子显微镜(SEM)对纸张表面形貌进行了观察。实验结果表明,在填料和助剂预絮聚后进行的加填,与实际生产工艺条件相比,成纸的灰分分别从10.8%、9.0%提高到12.2%、10.3%;成纸的抗张指数分别从21.6、23.4 N.m/g提高到22.2、27.6 N.m/g;填料和助剂预絮聚工艺条件下的加填,相对于普通生产工艺,在纤维交织所形成的毛细孔中的填料含量明显增加。

Using two pulps from two mills, the handsheets were prepared with adding filler in two ways, one was to simulate the current production operation, another was to use pre-floceulation technique, and the filler was pre-flocculated with wet end chemicals. The relation between fines con- tent and ash content, paper strength of the handsheets prepared by different loading processes was studied. The results indicated that when filler was added by using pre-flocculation technique, the ash content increased from 10.8% and 9.0% to 12. 2% and 10. 3%, tensile strength increased from 21.6 N.m/g and 23.4 N＇m/g to 22.2 N.m/g and 27.6 N.m/g of the handsheets prepared by using two different mill＇s pulps respectively. The surface morphology of the handsheets was analyzed by SEM; it was found that most of the pre-floccalated fillers were resented in the pores of fi- ber network, on the contrary, the fillers mainly resented on the fibers surface when fillers were added according to conventional process.