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Author: Susana Fernandes and Ana Paula Duarte
Influence of wet-end variables on the sizing efficiency of A
ABSTRACT: The purpose of paper sizing is to make paper more resistant to liquid penetration. Alkenyl succinic anhydride (ASA) is a synthetic sizing agent usually used in alkaline papermaking. ASA has a fast curing size, but it can lose its ability if it is in contact with water. This work studies the influence of dissolved Ca2+ and HCO3¯ ions in the papermaking stock, the effect of precipitated calcium carbonate (PCC), and the influence of pH and temperature on ASA sizing efficiency using bleached Eucalyptus globulus kraft pulps. Two different types of ASA (designated P and UP) and three different emulsions of ASA were used: starch + ASA P, starch + ASA UP, and starch + ASA UP + surfactant. We concluded that a high concentration of dissolved Ca2+ ions in furnish diminished the sizing efficiency of ASA. Depending on the type of ASA, concentrations below 300 or 500 ppm did not reduce the sizing efficiency. The amount of dissolved HCO3¯ ions in furnish does not determine the sizing degree of ASA. According to our results, it is possible to work with relatively high PCC loading levels. If it is necessary work with high filler loading levels, how-ever, it is better to increase the ASA concentration in stock. The pH and temperature are the limiting variables of the process; high temperature with high pH reduces the sizing performance of ASA.
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