Effect Of Filler And Its Modification On Paper Properties

With the "low-carbon economy" era coming,the trend of low basis weight paper development is becoming evident.However,reducing basis-weight makes paper opacity and stiffness decrease, the binding between the fibers weak, resulting in the production process to increase the frequency of interruption of paper, while easy to picking out the paper powder, paper through the printing. The results are as follows:Papermaking low weight paper with the requirements of high opacity, are better befilled with the mixed filler of PCC and titanium dioxide,especially when the ration of PCC and titanium dioxide is 3:2. Cationic starch can form a good coating on PCC surface, the main factors affect the coating conditions are the amount of cationic starch, PCC dispersions of solid content, shear force and reaction time. The filler modified by only PCC and PCC and titanium dioxide respectively has very good results on application in wet end or being filled into the sheet.Take the 35 g/m2 paper filled with 25% filler for example. The paper opacity is 81.88%, tensile index is 34.61 N.m/g, ash is 16.70% when the filler is modified by only PCC; paper opacity is 84.03%, tensile index is 33.3 N.m/g, ash is 14.28% while the filler is modified by PCC and titanium dioxide. yet paper opacity is 79.49%, tensile index is 28.92 Nm/g, ash is 12.93% when the filler is unmodified. Compared with the same proportion unmodified mixture filler, reducing the proportion of titanium dioxide in modified filler, still has some advantages on the optical properties and strength properties.Therefore, the modified mixed filler to be filled to the sheet, not only to improve the filler retention, increase the opacity of the paper and ash, while enhancing the integration between the fibers...