SUBSTITUTION OF HIGH-YIELD-PULP FOR HARDWOOD BLEACHED KRAFT PULP IN PAPER PRODUCTION AND ITS EFFECT ON ALKENYL SUCCINIC ANHYDRIDE SIZING

摘要

In recent years, there is an increasing interest in using high-yield pulp (HYP), as a partial replacement for hardwood bleached kraft pulp (HWBKP) in the production of high-quality fine papers as a costeffective way of improving the product performance. In this study, we investigated the substitution of HYP for HWBKP and its effect on the Alkenyl Succinic Anhydride (ASA) sizing performance. The results showed that the substitution of an aspen HYP for HWBKP can increase the ASA sizing performance at a HYP substitution of up to 15-20%. Different ASA adding sequences can have influence on the ASA sizing performance and adding ASA to the HYP first, then mixing with kraft pulps was the preferred method.The precipitated calcium carbonate (PCC) as paper filler, at its dosage of less than 20%, can increase the ASA sizing performance, due to the contribution from the calcium soup of the hydrolysed ASA; at its dosage of higher than 20%, a negative impact on the sizing performance was observed. Different PCC loading sequences can also affect the ASA sizing performance.