Canadian Forest Service Publications
Operational extractives management from mountain pine beetle-attacked lodgepole pine for pulp and papermaking. 2007. Allen, L.; Uloth, V. Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, Victoria, BC. Mountain Pine Beetle Initiative Working Paper 2007-15. 45 p.
Available from: Pacific Forestry Centre
Catalog ID: 28110
This report addresses the impact of mountain pine beetle infestation on extractives in pulp and paper mills and their impact on process operation. The main concerns addressed include: extractives in pulp, pitch control, friction properties of paper, effluent treatment, and soap separation in the kraft chemical recovery system. In kraft mills, use of beetle-affected wood in the green and red stages did not cause a change in the normal amount of extractives across the mill (after unbleached washing) that is greater than the normal variability. For gray-stage wood, however, preliminary results suggest that the amount of extractives in the final pulp can be significantly higher. Because of the higher resin acid content of beetle-affected wood in green and red stages, good brownstock washing is especially important in kraft mills. High resin acid content in the wood results in an increased solubility of fatty and resin acids in black liquor and a decrease in soap recovery to zero in kraft mills using gray-stage wood. Use of beetle-affected wood in thermo-mechanical pulping (TMP) pulp and paper mills did not seem to cause significant changes in the normal amounts of extractives and their chemical composition across the mill. Use of a pitch dispersant for pulping of green- and red-stage beetle-affected wood to prevent plugging of grooves in refiner plates may be necessary. The friction properties of newsprint made from beetle-affected wood were within the normal range for newsprint. Effluent treatment plants in TMP pulp and paper mills successfully reduced the extractives of effluents during use of beetle-affected wood to near-zero values. In the kraft mill using gray stage infested wood, the resin acid concentration in the final effluent was high
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