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Reasons for Using Dry Kilns
Conditions Necessary for Kiln Drying Lumber
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air enters air seasoning air valve air-dried air-operated amount become bulb casehardening ceiling cell walls cent humidity cent moisture circulation compartment kilns conifers cooled Courtesy cubic foot deﬁnite desired door Douglas ﬁr dried drier dry end dry kilns drying lumber ducts evaporation fans feet ﬁber-saturation point ﬁbers ﬁrst ﬂat ﬂoor ﬂow ﬂues Forest Products Laboratory grain green end hardwoods header coil heartwood heating coils heating pipes high temperatures hygrometer illustrated in Fig inch increase instrument interior kiln drying length located lumber piles material method moisture content operation pieces pine pipes pressure produce progressive kilns radial rapidly recirculated reduced regulated relative humidity resawed return-bend roof sapwood saturated sections shrink shrinkage side walls softwoods species sprays steam stickers sufﬁcient surface layers thermometer thermostat thick tion trap trucks tube usually ventilated kilns Ventilating type vertical wet-bulb wet-bulb temperature wood