Improving the Dimensional Stability of Spruce and Birch Boards by Heat-Treatment at 190 and 210℃
0
조회
0
다운로드
7
인용
0
참고문헌
키워드
초록
It is known that heat treatment decreases the hygroscopicity of wood. Thus heat-treated wood is good for outdoor construction due to its improved dimensional stability. This study is to investigate the hygroscopicity and discoloration of spruce and birch boards heat-treated above 190℃. The equilibrium moisture contents (EMCs) at all relative humidities decreased with the increase of heat treatment temperature and/or time for both spruce and birch. It was revealed that heat-treatment temperature affected more on the hygroscopicity thaan heat-treatment time. The average basic densities decreased for the spruce specimens, but increased for the birch specimens with an increase of the treatment time and/or temperature. The same heat treatment condition (190-8) made the birch specimens darker than the spruce specimens.
Abstract
It is known that heat treatment decreases the hygroscopicity of wood. Thus heat-treated wood is good for outdoor construction due to its improved dimensional stability. This study is to investigate the hygroscopicity and discoloration of spruce and birch boards heat-treated above 190℃. The equilibrium moisture contents (EMCs) at all relative humidities decreased with the increase of heat treatment temperature and/or time for both spruce and birch. It was revealed that heat-treatment temperature affected more on the hygroscopicity thaan heat-treatment time. The average basic densities decreased for the spruce specimens, but increased for the birch specimens with an increase of the treatment time and/or temperature. The same heat treatment condition (190-8) made the birch specimens darker than the spruce specimens.
참고문헌 (8)
- Bhuiyan, M.T.R., "Changes of crystallinity in wood cellulose by heat treatment under dried and moist conditions", Journal of Wood Science, 46(6), pp.431~436 (2000)
- Hoadley, R. B., "Understanding Wood" (1989), The Taunton Press
- Kalnins, M. A., "Increase in wettability of wood with weathering", Forest Products Journal, 43(2), pp.55~57 (1993)
- 강호양, "국산 침엽수재의 재색변화 기술 개발", 한국가구학회지, 19(3), pp.156~162 (2008), 한국가구학회
- 강호양, "Hygroscopicity and Surface Hardness of Domestic Wood Heat-Treated at 220℃", 한국가구학회지, 19(4), pp.229~234 (2008), 한국가구학회
- 이원희, "주요 국산 침엽수종의 평형함수율", 한국가구학회지, 19(1), pp.75~82 (2008), 한국가구학회
- Obataya, E., "Hygroscopicity of heat-treated wood I: Effects of after-treatments on the hygroscopicity of heat-treated wood", Mokuzai Gakkaishi, 46(2), pp.77~87 (2000)
- Tejada, A., "Reduction of growth stress in logs by direct heat treatment: Assessment of a commercial-scale operation", Forest Products Journal, 47(9), pp.86~93 (1997)