木材科学与技术2025，Vol.39Issue(4)：21-32,12.DOI:10.12326/j.2096-9694.2025071
加热介质及其压力对表层压缩毛白杨木材颜色的影响
Effects of Heating Media Composition and Pressure on Color Changes of Surface-Compressed Populus tomentosa Wood
摘要
Abstract
Effects of heating media composition and its pressure on color changes in wood during permanent compression deformation were analyzed using statistical methods.The heating media,including steam only,air only,nitrogen(N2)only,and the mixture of either steam combining with air or steam combining with N2 were used to treat the compressed poplar(Populus tomentosa)wood for permanent setting at 180℃for 2 hours at various pressures of 0.1 MPa,0.3 MPa,and 0.5 MPa.The variables that represented wood color,mass loss,and equilibrium moisture content(EMC)were measured.The results showed that the medium composition and pressure had significant impact on wood color changes.When L* decreased and a* increased consistently with the increasing pressures,wood surface color turned to red brown.When air only was used as the medium,△L* increased significantly with the increasing pressure.When steam only was used as the medium,a pressure of 0.5 MPa had a significant impact on △L*.When N2 only was used as the medium,the increasing pressure had no significant effect on △L*.The results of factorial analysis indicated that a certain relationship existed among the △L*,△E*,and △H*,between the △b* and △C*,and between the mass loss rate and EMC.Based on color changes,the clustering analysis results showed that the largest absolute values of △L* and△E* were 22.71 and 23.09 at 0.5 MPa respectively.Either 1/3 or 1/2 of air or N2 was added into the steam medium,△L* and △E* decreased more than 50%.Moreover,if the data was classified into 3 clusters,the similarity was shared among the clusters.If it was classified into 4 clusters,it could be further divided into 2 clusters:one was the treatment with air only and the mixed medium of steam and air,the other one was the treatment with a mixed medium of steam and N2.Through regulating the pressures and the mixing ratios of steam to air or N2,the color of the pressured wood can be controlled.关键词
毛白杨/表层压缩木材/加压热处理/热处理介质/木材颜色Key words
Chinese white poplar wood(Populus tomentosa)/surface-compressed wood/pressurized heat treatment/heating medium/wood color分类
农业科技引用本文复制引用
黄荣凤,何啸宇,王艳伟,孙龙祥,黎静,侯晓鹏,陈章景..加热介质及其压力对表层压缩毛白杨木材颜色的影响[J].木材科学与技术,2025,39(4):21-32,12.基金项目
国家自然科学基金项目"基于过热蒸汽压力和介质组成的木材塑性变形永久固定机理及其适用性"(32071690) （32071690）
湖州市重点研发计划项目"劣质材增强及表面高质修饰地板关键技术研发"(2022ZD2049). （2022ZD2049）
