Investigating the Effect of Using Ground Calcium Carbonate (GCC) and Clay Fillers on the Paper Properties

The trend of development in pulp and paper industry is to have higher filler content in writing and printing papers. However، the strength of paper will be reduced by increasing filler content، despite of maintaining many benefits such as improving the optical properties. In this study، the effect of different consumption levels of GCC and clay fillers on the strength and optical properties of a furnish containing 70% hardwood CMP and 30% bleached Softwood kraft pulps، was investigated. The results indicated that، by using GCC filler، in comparison with clay، it is possible to produce writing and printing paper at higher brightness and strength properties.