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Read e-book online An Introduction to the Seasoning of Timber PDF

By W. J. Kape

ISBN-10: 0080106358

ISBN-13: 9780080106359

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Extra info for An Introduction to the Seasoning of Timber

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130 ft per sec. In kiln drying, temperature of the dry bulb and air velocity is high enough under normal working conditions to enable relative humidity to be found and maintained in the correct ratio for proper drying. SOURCES O F ERROR Wet and dry bulb readings may err because of bad maintenance. The sleeving to the wet bulb should be the correct linen or cotton tubular kind, suppHed by the hygrometer manufacturer. If the sleeving is dirty or badly fitting, wet bulb readings will be affected, as they will also if the radiation shields covering the bulbs are wetted when the water in the container is renewed.

Badly dried wood that has split, twisted and distorted, does not only create higher wastage factors, but reduces the quality by one or more grades. It is no exaggeration to say that a tree with 100 per cent volume, may only produce 25 per cent of usable material, and in extreme cases a much lower figure. Let us assume that the entire yield of timber is of first quality stock. If this is badly handled in drying, the quality then becomes second quality or even lower. The inference is obvious. M E T H O D OF MOISTURE MOVEMENT It has been explained that the movement of moisture is governed by various factors including the capacity of the surrounding air to absorb moisture from the surfaces of the wood.

Green oak can be kiln dried, but the risks from surface checking, discoloration, case hardening, and collapse, are high, plus the fact that the process would tie up the kiln for about two months. Obviously a different technique would have to be followed and this would mean air drying the timber for several months to reduce the moisture content, and then to kiln dry the stock down to the requisite 10 per cent. It should be noted that in the foregoing example, English Oak was cited. Had this been Japanese or American Oak, the stock could have been kiln dried straight away, since the fact of shipment from abroad in boards, means the moisture content has been suitably reduced to avoid degrade during the voyage.

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An Introduction to the Seasoning of Timber by W. J. Kape

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