Tests of Drying Rate and Scoring of Defects for the Prediction of Conventional Kiln Drying Quality of Eucalyptus sp. Wood – Part 2

ABSTRACT This research is a continuation of Klitzke & Batista (2010) work. The main objective was to assess whether the wood quality in the methodology of drastic drying test at 100 °C corresponds to that of conventional kiln drying. It was used 11 years old Eucalyptus saligna, Eucalyptus grandis and Eucalyptus dunnii woods, which were kiln dried together in the same batch in a pilot scale kiln, doing three repetitions. Drying defects evaluated were end and surface cracks, cupping and collapse, which generated a mean score by species, which was compared to the score of defects of the drastic drying test, as well as to the basic density and the total volumetric shrinkage. Eucalyptus grandis and Eucalyptus saligna had higher wood quality in conventional drying than Eucalyptus dunnii. It was rejected the hypothesis of using the score of defects in drastic drying test as a way of predicting the quality of conventional kiln drying.

摘要：本研究系Klitzke与Batista（2010）相关研究的后续拓展。核心目标为评估100℃剧烈干燥试验法所得木材品质与常规窑干木材品质是否一致。试验选取11年生柳桉（Eucalyptus saligna）、巨桉（Eucalyptus grandis）及邓恩桉（Eucalyptus dunnii）木材，将三者置于中试规模窑干炉中同批次窑干，共设置三次重复试验。本研究评估的干燥缺陷包括端裂、表面裂、翘曲与塌陷，据此计算各树种的平均缺陷得分，并将该得分与剧烈干燥试验的缺陷得分、木材基本密度以及总体积收缩率进行对比。常规窑干条件下，巨桉与柳桉的木材品质优于邓恩桉。本研究否定了"以剧烈干燥试验的缺陷得分预测常规窑干木材品质"的假设。