USE OF DISTILLED TALL OIL AS A FLOTATION COLLECTOR IN DEINKING MILLS - DISCUSSES STRATEGIES TO REDUCE FATTY-ACIDS AND INCREASE RESIN ACIDS IN DEINKED PULPS

A comparison of the composition of extractives of three commercial new sprint papers suggested that runnability problems such as run-aheads i n pressrooms, was related to a high fatty acid and/or low resin acid c ontent in the paper. A number of strategies were vied in the laborator y and at a mill site to reduce the fatty acid levels in a deinked pulp . Replacement of the saturated fatty acids with distilled tall oils wi th various resin acids contents, with and without addition of a nonion ic surfactant, yielded good notation efficiencies and a significant in crease in the paper-to-paper friction.