硅藻土的添加对纸张性能的影响

Effects of internal addition of diatomite on properties of the handesheet

评价了添加硅藻土纸张的光学、物理性能,以及对密度的影响,探讨了硅藻土作为造纸填料的适应性。实验结果表明:单独添加硅藻土纸张的白度高于PCC、GCC添加纸张,并且PCC、GCC并用添加硅藻土(并用添加30%以内)可提高纸张的白度。对不透明度的影响,两者之间没有太大的差别,但PCC、GCC并用添加硅藻土(并用添加20%)时,可得到非常良好的不透明度。硅藻土的添加可降低纸张的紧度。通过SEM照片也证实了纸张厚度的增加。但考虑层间强度的影响,在30%以内的添加量较合适。

The influences of diatomite on optical and physical properties of handesheet and its density were evaluated in this paper. The adaptability of diatomite as papermaking filler was discussed as well. The results showed that the brightness of handsheets added only diatomite as filler, is higher than those added with PCC or GCC respectively. In addition, the brightness of sheets can be enhanced by combining the diatomite with PCC or GCC（the amount of diatomite should be less than 30 %）. The different kinds of additives have little effect on the opacity of handsheets. Meanwhile good opacity of sheets can be achieved when the usage amount of diatomite reached 20%. Furthermore,the density of handsheets decreased as the diatomite adding with the sheets thickness increased, which has been confirmed by SEM characterization. With the concern of the tensile strength between fiber layers, the adding amount of diatomite should be within 30%.