Abstract
Soda-anthraquinone (soda-AQ) pulping of sunflower stalks increased the rate of delignification and the pulp yield, and improved the bonding strength properties at the lower active alkali consumption compared to soda pulping. The wet depithing of the stalks contributed considerably to the yield and strength properties, together with decrease in alkali consumption and rejects. Addition of guar gum (0.5% on oven-dry pulp) during beating after reaching 25°SR as wet-end/dry-strength agent, improved further the drainability and strength properties. The soda-AQ pulping makes pulping of sunflower much more attractive and feasible once the other technical constrains such as the high pith content are overcome by employing recent techniques developed for other agricultural residues.
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