Roger B. Keey

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This two-part set of papers presents a study of the stress and check development inPinus radiata boards under high-temperature kiln-seasoning conditions. In the first part, a one-dimensional stress model incorporating the various strain components is developed based on a physically realistic model of drying behaviour. The drying of sapwood is assumed to be(More)
This work examines the applicability of mathematical models for correlating the visco-elastic strains during kiln drying of radiata pine (Pinus radiata D. Don) sapwood at various temperatures and moisture contents. The eventual aim is to use a mathematical model incorporating these strains to optimise the drying schedules and minimise the degradation. Data(More)
Although the increasing economic importance of Eucalyptus lumber to furniture and other value added products manufacturing, its industrial use is still small. One of the main reasons is the difficulty to dry the lumber and related loses of row material. There is a general recommendation in literature to use a low drying rate in initial stages of the(More)
 Stacked lumber in a box-shaped kiln is prone to non-uniform flows due to the appearance of re-circulation zones before and after the stack. Flow visualisations in a hydraulic model of a kiln were conducted to test the effectiveness of different kiln configurations for eliminating the larger re-circulation zone at the inlet to the stack. When the sharp(More)
This paper presents a study of the effectiveness of cooling and steam-conditioning processes in relieving drying stresses in high-temperature dried sapwoodPinus radiata boards. An earlier-developed model of moisture movement and stress development has been modified to analyse a procedure recommended by the New Zealand Forest Research Institute. While the(More)
The boric acid retention profile in a plece of timber which has been treated by the vapour boron process can be accurately predicted by a model which includes both convective and diffusive fluxes if the initial moisture content of the timber is known. The reaction rate between the adsorbed water and trimethyl borate is a strong function of the differential(More)
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