Effect of Precipitated Calcium carbonate (PCC) on paper properties with CMP-Long Fiber furnish

This study was carried out with this target to investigate the effect of using precipitated calcium carbonate (PCC) mineral filler on properties of printing and writing paper. PCC mineral filler in 20%، 30%، and 40% levels was added to the fiber suspension prepared by mixing Wood-Free pulp with CMP pulp (30:70 ratio)، in order to improve the optical properties and also diminish the used fiber amount which is more expensive and costly constituent part of paper. In order to improvement in filler retention in paper، high molecular weight and high charge density cationic polyacrylamide (C-PAM) polymer also was used as retention-aids. Results indicated that optical properties of prepared handsheet papers were improved by increment in filler amount in paper، but on the other hand the other strength indices reduced، except tear index which approximately remained without change.