文献类型：期刊文献

中文题名：加热介质及其压力对表层压缩毛白杨木材颜色的影响

英文题名：Effects of Heating Media Composition and Pressure on Color Changes of Surface-Compressed Populus tomentosa Wood

作者：黄荣凤[1] 何啸宇[2] 王艳伟[2] 孙龙祥[2] 黎静[1] 侯晓鹏[1] 陈章景[3]

第一作者：黄荣凤

机构：[1]中国林业科学研究院木材工业研究所,国家林业和草原局木材科学与技术重点实验室,北京100091;[2]久盛地板有限公司,浙江南浔313009;[3]弗吉尼亚理工学院,美国布莱克斯堡VA24061

年份：2025

卷号：39

期号：4

起止页码：21-32

中文期刊名：木材科学与技术

外文期刊名：Chinese Journal of Wood Science and Technology

收录：;北大核心:【北大核心2023】；

基金：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);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)。

语种：中文

中文关键词：毛白杨;表层压缩木材;加压热处理;热处理介质;木材颜色

外文关键词：Chinese white poplar wood(Populus tomentosa);surface-compressed wood;pressurized heat treatment;heating medium;wood color

分类号：S781.7;S792.117

摘要：采用统计学方法,综合分析木材压缩变形永久固定(定型)过程中热处理介质组成及其压力对木材颜色的影响,为处理过程中木材颜色变化控制提供依据。以蒸汽、空气、氮气,以及蒸汽与空气、蒸汽与氮气的混合气体为热处理介质,在气体压力分别为0.1、0.3和0.5 MPa的环境中,对表层压缩毛白杨(Populus tomentosa)木材进行180℃、2 h的压缩变形固定处理,测定木材的颜色参数、质量损失率(mass loss,ML)和平衡含水率(equilibrium moisture content,EMC)。结果表明,介质种类和压力对毛白杨木材颜色有显著影响。随着压力的增加,处理材的L^(*)降低,a^(*)值增大,颜色向红棕色转变。以空气为介质时,随着压力的增加,处理材的△L^(*)显著增大;以蒸汽为介质时,压力增大至0.5 MPa时才对处理材△L^(*)产生显著影响;以氮气为介质时,压力的增加对处理材△L^(*)无显著影响。因子分析结果表明,处理材△L^(*)、△E^(*)和△H^(*)三者间,△b^(*)和△C^(*)间,以及ML和EMC间,均存在相关关系。基于颜色差值的聚类分析结果,在0.5 MPa压力下蒸汽介质处理材的△L^(*)和△E^(*)最大,分别为22.71和23.09,单独聚为一类;蒸汽介质中混入1/3或1/2的空气或氮气后,处理材的△L^(*)和△E^(*)均可降低50%以上,而且在聚为三类的情况下出现在同1个集群,在聚为四类的情况下又可以分为含有空气的介质处理和蒸汽与氮气混合介质处理2个集群。调控气体压力、以及蒸汽与空气或氮气的混合比,可以减少处理木材的色差,实现木材颜色的调控。
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(N_(2))only,and the mixture of either steam combining with air or steam combining with N_(2) 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 N_(2) 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 N_(2) 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 N_(2).Through regulating the pressures and the mixing ratios of steam to air or N_(2),the color of the pressured wood can be controlled.