Effects of Selective Addition of Papermaking Chemicals to Fines and Long Fibres on Strength and Runnability of Wet Paper, 2008 PAPERCON Conference

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Selective addition of papermaking chemicals to fines and long fibre fractions are known to have positive effect on strength properties of dry paper. Practically no information on the effects of selective addition on drainage and wet web properties is available. In this laboratory scale study, the effect of adding cationic starch and synthetic cationic polymer selectively to different fibre fractions was examined. TMP and bleached hardwood kraft pulp were used. The pulps were fractionated to fines and long fibre fractions. Starch was added into the long fibre fraction and synthetic cationic polymer was added into the fines fraction. After a certain time the fractions were combined and hand sheets were prepared. Tensile strength and tension holding capacity of the wet and dry paper were measured using high strain rate. The tension holding capacity (defined as the tension after a fast straining to 1% elongation followed by 0.5 seconds of relaxation) has been found to be a good indicator of wet web runnability in high speed machines.