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Effect of supercritical CO 2 treatment and kiln drying on collapse in Eucalyptus nitens wood
European Journal of Wood and Wood Products ( IF 2.6 ) Pub Date : 2020-01-30 , DOI: 10.1007/s00107-020-01500-5
Bernard S. W. Dawson , Hamish Pearson , Mark O. Kimberley , Bruce Davy , Alan R. Dickson

Collapse-prone timbers such as species of Eucalyptus are poorly utilised due to low conversion rates that necessitate long pre-drying times. A supercritical CO2 lumen water expulsion pre-treatment prior to kiln drying is proposed to bypass lengthy pre-drying. After drying (air, kiln or oven drying), shrinkage, collapse, washboard depression and checking of Eucalyptus nitens were determined using image analysis of 0.8 mm thick wafers and 5 mm thick biscuits. Lumen water expulsion-kiln drying reduced collapse by 75% and washboard depression by 71%, compared to drying from green. As water is removed from the water conductive tissue (vessels, rays, and fibre-tracheids) by lumen water expulsion, the water column is broken throughout the specimen, thereby disrupting the development of meniscus-induced water tension as subsequent drying occurs. Remaining water is proposed to reside in the non-water-conductive fibre tissue. If the process can be applied on large scale to Eucalyptus nitens, there is the opportunity for higher conversion rates to increase the commercial viability of solid wood products.

中文翻译:

超临界CO 2处理和窑干燥对桉木木材倒塌的影响

由于转化率低,因此需要很长的预干燥时间,易塌陷的木材(例如桉树)的利用不善。提出在窑干燥之前进行超临界CO 2内腔水排出预处理以绕过冗长的预干燥。干燥(风干,窑炉或烤箱干燥),收缩,塌陷,搓衣板凹陷并检查桉树后使用0.8毫米厚的薄饼和5毫米厚的饼干的图像分析来确定。与从绿色干燥相比,流明水排出窑干燥减少了75%的塌陷,而搓板降低了71%。由于通过管腔水排出而从导水组织(血管,射线和纤维-管摆物)中除去了水,水柱在整个样品中破裂,从而在随后发生干燥时破坏了弯液面引起的水张力。建议将剩余的水留在非水传导性纤维组织中。如果该方法可以大规模应用于桉树,则有机会获得更高的转化率,从而提高实木产品的商业可行性。
更新日期:2020-01-30
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