Improvement the Strength Properties of Chemimechanical Pulp Using Cationic Cellulosic Fines

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Cationic polymeric retention aids are usually used to increase fines and filler retention in papermaking but paper strengths are impaired at increased level of filler retention due to loss in fiber-to-fiber bonding. Synthesizing of cationic fiber fines and its- utilization as retention aids- in comparison with Cationic Polyacrylamide(C-PAM), was investigated at present research. - Fines were prepared from - bleached softwood kraft pulp after extended refining( 40000 PFI revelotions) up to about 50 mL, CSF, followed by screening with water jet on 200 mesh screen. Cationic fiber fines were prepared by using monomers of cationic ester amine salt. The results of cationic fines analysis by FTIR, kajeldal nitrogen content, and Zeta potential indicated that, the cationic groups were generated in the fiber fines and adsorbed on fibers and fillers in the process of papermaking. The effects of using different amounts of 0.3, 0.9, and 1.5% cationic fiber fines, in comparison with 0.1, 0.2, and 0.3% C-PAM, based on OD CMP pulp, have been investigated on filler retention as well as produced handsheets properties. The results showed that produced handsheets with using of cationic fines versus cationic polyacrylamide had higher strength properties. In addition, using a mixture of cationic fines and C-PAM, led to further improvement in the strength properties of paper.

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