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Principles and Practices of Drying Lumber

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Principles and Practices of Drying Lumber ( principles-and-practices-drying-lumber )

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List of Tables and Figures Table I Approximate Relationship Between RH and EMC at Room Temperature..............6 Table II Drying Systems and Quality for 4/4 Lumber............................................................10 Table III Variation in Shrinkage for Different Oak Species...................................................16 Table IV Change in Width for a 3" Wide Piece When MC Changes...................................17 Table V The Maximum Safe Rate of Drying ..........................................................................22 Table VI Relationship Between Shrinkage, MC, EMC, and RH ..........................................39 Table VII Recommended Kiln Schedule (T4-D2) for 4/4 and 5/4 Upland Red Oak ..........42 Table VIII Modified Kiln Schedule (T3-D2) for 4/4 and 5/4 Upland Red Oak.....................44 Table IX Traditional Wet-bulb Temperatures for Equalizing Hardwoods............................46 Table X Traditional Wet-bulb Temperatures for Conditioning Hard and Softwoods..........47 Table XI Drying Defect Identification ......................................................................................52 Figure 1 Effect of Velocity on Drying Rate at Different MCs ..............................................27 Figure 2 Combined Effect of Velocity and Humidity on Drying Rate.................................27 Figure 3 Checking for Checks................................................................................................37 Figure 4 Final Moisture Content and Stress Tests ..............................................................57 4

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