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11/22/2021 Cyclic/Convection Vacuum Drying • Lumber is heated using convectional methods • Lumber is stickered • After heating phase, a vacuum is drawn causing drying • When the wood temperature drops, the heating cycle is repeated Superheated Steam Vacuum Drying • Superheated steam is used under low-pressure conditions and forced through courses of lumber 19 20 21 22 23 24 Radio Frequency Drying • Heating occurs by using an alternating electromagnetic field causing polar water molecules in the wood to shift when changes fields. • The rapid shifts causes the wood to heat up. Source: www.heatwave.com Vacuum Drying Advantages • Much shorter drying times • Lower drying temperatures • Wood retains original color • Stronger wood • Quality at least as conventional drying • No Volatile Organic Compounds (VOC) emissions • Energy efficient Advantages Continued • More uniform final moisture content • Much easier to mix species and thickness • Just-in-time inventory • Use less valuable space Disadvantages • High cost of energy and equipment • Vessel capacity • Each system is different • Risk of over-drying • Dependent on permeability (white oak) • Equalization and conditioning capabilities (M.C. variations among boards and residual stresses) • Complex technical operational skills • Loading and unloading challenges 4PDF Image | Understanding Vacuum Drying Technologies
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