IMPROVING THE QUALITY OF TIMBER FROM RED BEECH (N. FOSCA) BY INTERMITTENT DRYING
作者:
T.A.G. Langrish,
R.B. Keey,
M. ~umar',
期刊:
Drying Technology
(Taylor Available online 1992)
卷期:
Volume 10,
issue 4
页码: 947-960
ISSN:0737-3937
年代: 1992
DOI:10.1080/07373939208916489
出版商: Taylor & Francis Group
关键词: cyclic conditions;drying time;hardwood;timber quality
数据来源: Taylor
摘要:
The effect of cycling the external conditions on the timber quality and drying time during seasoning has been studied for red beech (Nothofagus fusca), a difficult-to-dry New Zealand hardwood, inalaboratorybatchdryer. Intermittent drying at anair temperature of 45°C and a wet-bulb depression of 10°C takes longer to yield a given moisture content than continuous drying under the same conditions, but produces timber without honeycomb or severe case-hardening as observed in continuous drying. The experiments also indicate that the timber can tolerate a higher air temperature (55°C) in intermittent drying at the same wet-bulb depression with less case-hardening and without showing honeycomb compared with continuous drying at 45°C, having a similar total drying time. Intermittent drying at a slightly higher dry-bulb temperature (60°C) and a much higher wet-bulb depression (18°C) gives a similar degree of case-hardening to that found in samples dried continuously at a dry-bulb temperature of 45°C.
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