Effect of Drying Temperature on Colorimetric Change in Plantation-grown Eucalyptus Wood

摘要：

In order to make out the reasonable drying technology suitable for plantation-grown eucalypt wood, the the colorimetric parameters in seven species of Eucalyptus urophylla, E.grandis,E.urophylla×E.grandis, E. grandis×E.urophylla, E. dunii, E.cloeziana and E. pellita wood dried at 3 levels of 20℃, 60℃ and 100℃ were measured and evaluated. The results demonstrated that: (1) The lightness(L*), chroma(C*),hue value(h) and color difference (△E*ab) in seven species of plantation-grown eucalyptus wood appeard to be turning point at 60℃, except for E. dunii. (2) Color change at less than 60℃ would be mainly affected by the polyphenol compounds, in particular hydrolysable tannins, while either the degradation of hemicellulose or the combination of hemicellulose and polyphenol compounds probably played major role in color change at more than 60℃. (3) With the increasing of temperature, △E*ab gradually decreased and the color becamed more homogeneous.Accordingly, it is suggested that it should be reasonable to properly enhance temperature in the last stage of drying plantation-grown eucalypt wood.

关键词： Drying temperature Plantation-grown Eucalyptus Colorimetric parameters CIEL*C*h colour system

作者: WU Yi-qiang LIU Yuan

作者单位: College of Material Science and Technology,Central South University of Forestry & Technology,P.R.China,410004

会议类型: 国际会议

会议名称: 2007 International Conference on Agriculture Engineering(2007年农业工程国际会议)

会议地点: 河北保定

会议语种:英文

页码: 670-674

在线出版日期: 2007-10-20（万方平台首次上网日期，不代表论文的发表时间）