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Reasons for Using Dry Kilns
Conditions Necessary for Kiln Drying Lumber
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air enters air seasoning air-dried air-operated amount become bulb casehardening ceiling cell walls cent humidity cent moisture circulation compartment kilns condensation conifers construction cooled Courtesy desired diaphragm difference door Douglas fir dried drier dry end dry kilns dry-bulb Dry-bulb temperature drying lumber ducts especially evaporation feet fiber-saturation point Forest Products Laboratory grain green end hardwoods header coil heartwood heating coils high humidity high temperatures honeycombing hygrometer illustrated in Fig inch increase instrument interior kiln drying length located lower lumber pile material method moisture content operation pieces pine pipes pressure produce progressive kilns radial rapidly recirculated reduced regulated relative humidity resawed return-bend roof samples sapwood saturated schedules sections shrink shrinkage side walls softwoods sprays steam stickers surface checks surface layers temperature and humidity thermometer thermostat thick tile tion trap trucks usually Ventilating type wet-bulb wet-bulb temperature wood