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Effect of heating methods on drying quality of small-diameter birch lumbers

Journal of Harbin Institute of Technology(New Series) 2005年第5期12卷 536-539页

作者：郭明辉赵西平闫丽 Key Laboratory of Bio-based Material Science and Technology Northeast Forestry University Harbin 150040 China

Following a normal low temperature drying schedule, the small-diameter Birch lumbers （ 1 000mm× 45mm ×30mm） were dried with consecution-heats or intermittent-heating, visual drying defects （bow, crook, twist, check along grain and end check） were measured, and then statistical analyses were performed. It was found that the drying quality of small-diameter Birch lumbers could be improved with intermittent-heating, but the intermittent time should be prolonged. Prolonging intermittent time helped to weaken or even avoid wood distortion and drying checks. It wash＇ t helpful in avoiding crook. The drying quality of small-diameter Birch lumbers with all kinds of drying methods reached the second class of the Chinese National Standard. The drying quality reached the first class of the Chinese National Standard with the intermittent-heating in the area of visual wood defects.

关键词： small-diameter timber birch lumber consecution-heats intermittent-heating drying quality

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STUDY ON IMPROVING drying quality OF SMALL-DIAMETER LUMBERS WITH INTERMITTENT-HEATING METHOD

STUDY ON IMPROVING DRYING QUALITY OF SMALL-DIAMETER LUMBERS ...

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作者： Guo Minghui, Zhao Xiping, Yang Haili Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China

＜正＞Heating methods affect the drying quality of lumbers. In this study, the small-diameter Birch lumbers were dried with consecution-heats or intermittent-heating, visual drying defects （bow, crook, twist, check along grain and end check） were measured before drying and after drying, and then statistical analysis were performed. It was found that the drying quality of small-diameter Birch lumbers could be improved with intermittent-heating, but the intermittent time should be prolonged. Prolonging intermittent time helped to weaken or even avoid wood distortion and drying checks. It wasn’t helpful in avoiding crook. The drying quality of small-diameter Birch lumbers with all kinds of drying methods reached the second class of the Chinese National Standard. The drying quality reached the first class of the Chinese National Standard with the intermittent-heating in the area of visual wood defects.

关键词： Small-diameter timber Birch lumber Consecution-heats Intermittent-heating drying quality

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Study of drying of small diameter Larch lumbers with intermittent heating

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Journal of Harbin Institute of Technology(New Series) 2006年第4期13卷 431-434页

作者：郭明辉赵西平 Key Laboratory Bio-based Material Science and Technology Northeast Forestry University

Intermittent heating for drying of small diameter Larch lumbers is investigated experimentally. The lumbers were dried using an experimental drying schedule. Moisture content (MC) of the lumber was continuously recorded and final drying defects were examined. The drying curves showed that the drying rate was a constant in the early stage of intermittent heating drying and decreased evidently when the MC was about 18% (intermittent 2h) and 20% (intermittent 6h). The drying quality reached the second (intermittent 2h) and first grade (intermittent 6h) of the Chinese National Standard. The visual drying defects, especially the check extent along grains were reduced with intermittent heating. When the intermittent time increased, the effect was more obvious.

关键词： small diameter lumber Larch intermittent heating drying curve drying quality

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