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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The EMC (Equilibrium Moisture Content) is the numerical value of the in-use MC for the spruce at equilibrium with the indicated humidity. Almost all species of wood have similar values as spruce, varying by less than 2% EMC below 80% RH. Some species, especially those with a lot of extractives, and many tropical species will vary at the higher RH values, with the EMC for those species usually being lower than for spruce. It should be noted that the most common cause of manufacturing defects in furniture and cabinet plants that occur after drying (probably 85% of the defects that I am called on to help cure) is incorrect MC. Careful attention must be paid to the humidity (not the temperature) in which lumber is stored, manufactured, shipped, and used to assure that the MC of the dried lumber or wood product is kept close to the final, in-use EMC at all times. 7

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