MOISTURE CONDUCTIVITY AND DENSITY OF INDUSTRIAL WOODS: A STUDY FOR EFFECTIVE DRYING
Keywords:
lumber; convection drying; processing temperature; moisture conductivity coefficient; basic density.Abstract
An analysis of the physical properties of the main industrial tree species revealed significant variation across growing regions with different climatic conditions. For drying sawn timber products, convection chambers equipped with automatic systems with pre-set schedules designed for tree species native to the countries where dryers are manufactured are most widely used. It does not always lead to positive results. Adjusting the parameters of the modes requires the density and moisture-conductivity coefficients for industrial tree species. The dependence of moisture conductivity coefficients in the transverse directions of moisture movement on temperatures in the 25 °C – 80 °C range was determined. Adequate regression equations for the dependence of moisture conductivity coefficients on temperature in the tangential and radial directions were obtained. The values of the average basic density of these tree species originating from different regions and its dispersion determined experimentally were as follows: pine 414 kg∙m-3 ± 11%; alder 448 kg∙m-3 ± 9%; oak 569 kg∙m-3 ± 10%; ash 640 kg∙m-3 ± 6%; hornbeam 667 kg∙m-3 ± 7%. These values were used to determine the analytical dependence of the moisture conductivity coefficients on the basic density and its dissipation, which is necessary for developing optimal schedules of drying sawn timber by adequately modelling convection drying and predicting process quality.
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Copyright (c) 2025 prof. Ing. Ján Sedliačik, PhD., Andrii Spirochkin , Olena Pinchevska, Yuriy Lakyda, Denis Zavyalov, Rostislav Oliynyk
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