Research On The Application Of Modified Filler Used In Papermaking

At present, our country is a world leader in the production and consumption of paper and paperboard. However, it is insufficient in raw materials year by year, especially for the high quality materials. Fillers added in papermaking not only can save fibers, but it can also reduce production costs and improve some properties of paper. Now, the main filler used in paper industry is talcum powder、calcium carbonate and kaolin. However, these fillers added to the pulp will generally reduce the physical strength of the paper. Researching and using of the modified filler can make better use of current resource to produce paper.The modification talcum powder filler and calcium sulfate whisker filler were studied in this paper. The purpose of modified talcum powder used in base paper for diazotype is to improve the filling performance and filler percentage. The strength performance of paper filled with modified talcum powder and paper filled with unmodified talcum powder were analysed and compared under the conditions of satisfaction forurrent process of paper factory and the quality index needed in base paper. And the filler retention was detected in this study. The experimental results showed that,while paper filled with 20% non-modified talcum power and 35% modified talcum power has roughly the same tensile index,paper filled with 35% modified talcum power has better strength properties either by handsheet or machine-made. Besides, modified talcum power filler retention is improved.This research is also connected to the structure function and characteristics of calcium sulfate whisker, and studied the dissolution restraint of calcium sulfate whisker simply. In the study, the dissolvability change of calcium sulfate whisker after adding modifier such as TSNG or LHBG was analysed, and the change of the paper whiteness and some strenth of papers after filling the modified calcium sulfate whisker were also studied. Meanwhile, the filler retention was measured in this study. The experimental results showed that adding appropriate modifier TSNG or LHBG can reduce phosphorus gypsum whisker solubility effectively. The paper filled with modified phosphorus gypsum whisker can obtain better whiteness. But paper sheet strength is reduced to a certain extent.