Canadian Forest Service Publications
Effects of acetone extractives in grey-stage mountain pine beetle-killed lodgepole pine on kraft mills. 2010. Allen, L.; Gagné, A. Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, Victoria, BC. Mountain Pine Beetle Working Paper 2009-28. 15 p.
Available from: Pacific Forestry Centre
Catalog ID: 31200
Previous work has indicated that in a kraft mill pulping a large proportion of grey-stage mountain pine beetle-killed wood, the concentration of extractives in the final bleached pulp increased. As this might give some customers pitch problems and affect product marketability, further research has been done to determine if this is a common problem. New results reveal that, like the wood extractives content in grey-stage pine chips, pulp extractives in grey-stage mill pulps are variable and can occasionally be high (e.g., > 0.05%), likely because of the composition of the extractives in the incoming chips. While this does not usually cause pitch problems in the pulp mill and its customer paper mills most of the time, kraft mills selling grey-stage pulp to extractives-sensitive customers should check the extractives content before shipment as it may occasionally be unacceptably high. It was also previously reported that the resin acid concentration in the final effluent from this grey-stage mill was high (3 mg/L). As concentrations greater than 1 mg/L could cause toxicity episodes, we have done further testing in several kraft mills using grey-stage beetle-killed wood and found resin acid concentrations to be consistently low and below 1 mg/L.
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