timber2pp16.05

timber2pp16.05 - Timber Seasoning Seasoning is the...

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DJ Lavery Timber Seasoning Seasoning is the controlled drying down to a moisture content level consistent with the end use of the timber Air drying Kiln drying – quickly in conditions of controlled heat air flow and moisture Too rapid drying can result in damage - degrade
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DJ Lavery Timber Principles of seasoning It is essential to keep a balance between evaporation of water from the surface and the movement of water within the timber Below fibre saturation point shrinkage takes place Some timbers are predisposed to shrinkage problems Too rapid drying sets up a steep moisture gradient Outer layers can shrink & are restrained by the wet interior resulting in damage
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DJ Lavery Timber Principles of seasoning Three factors control movement in wood – Humidity Rate of circulation of air Temperature of the surrounding air
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DJ Lavery Timber - Natural Defects Compression wood Found in softwoods - lower side of inclined trunks Excessive, irregular longitudinal shrinkage Lower strength properties Eccentric pith, circular cells, denser wood Tension wood Found in hard woods - upper side of inclined trunk Annular rings wider High longitudinal shrinkage Weak in compression parallel to the grain Other natural defects Shakes, splits & knots
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DJ Lavery Timber - Conversion Defects Wane Occurs when sawing produces rounded periphery of the
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timber2pp16.05 - Timber Seasoning Seasoning is the...

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