Operating Experiences with the Lo-Solids Pulping Process at Willamette Industries, 1999 Pulping Conference Proceedings
Dave Stanley, Bruno Marcoccia
In 1994 Willamette Industries’ Johnsonburg mill underwent a major, mill wide expansion and modernization. As part of the new fiberline a single vessel hydraulic digester was commissioned and then shortly afterwards converted to Lo-Solids cooking operations. This paper describes the long term operating experiences with the Lo-Solids pulping process. Compared to earlier batch and earlier modified continuous operations, the Lo-Solids cooking operation resulted in improved yield, washing, bleachability, pulp viscosity and paper machine runnability. Pulp yield was measured based on long term production and accounting data, and also by using laboratory methods. The production and accounting data indicate a bleached yield of 48.2%, while the laboratory based method indicates a bleached yield of 49.7%, both expressed as bone dry tons bleached pulp per bone dry ton of wood to the digester.
Operating Experiences with the Lo-Solids Pulping Process at Willamette Industries, 1999 Pulping Conf