木材科学与技术2025，Vol.39Issue(4)：2-20,19.DOI:10.12326/j.2096-9694.2025012
基于空气与蒸汽介质组成比及其压力调控的木材压缩变形永久固定
Permanent Setting of Compressive Deformation in Surface-Compressed Wood through Regulation of Air-Steam Medium Composition and Pressure
摘要
Abstract
Permanent setting of compressive wood deformation has been a focus of wood modification.The heated and pressurized air only,steam only,and their mixture were applied as the heating media to treat surface-compressed poplar wood(Populus tomentosa)to study permanent setting.In the heat treatment process,the medium pressures were 0.1 MPa,0.3 MPa,and 0.5 MPa;the treatment temperature was 180℃;the treatment time was 2 hours.The effects of treatments on the set recovery,physical,chemical,and mechanical properties of compressed wood were recorded and analyzed.When steam-only treatment was used,at 0.5 MPa,around 80%of the compression was permanently set,compared to 54%of the compression deformation setting when air-only treatment was used.Although air-only treatment causes hemicellulose degradation,by-products of acetic acid and aldehyde compounds were significantly lower than that when steam-only treatment was applied.The correlation between set recovery induced from water absorption and crystallinity index(r=0.921,p<0.01)was closer than that between set recovery induced from water absorption and hydroxyl absorption strength based on the statistical analysis of the entire sample(r=0.557,p<0.05).It partially explained that hemicellulose degradation process contributed to permanent setting,greater than hygroscopicity decreased due to the reduction of hydroxyl groups.Compared with air-only,when the volume ratio of air and steam was 1∶1 or with steam ratio in the medium,the reduction rate of EMC and set recovery on the treated wood increased by 50%,and the loss rate of wood hardness and surface hardness decreased by more than 4.6%.The mixture of air and steam reduced the amount of steam used in the treatment process and simplified the treatment process.This process significantly reduces the production cost of compressed wood and accelerates the commercial application of wood compression technology.关键词
毛白杨/压缩变形固定/空气介质/蒸汽介质/回复率/化学成分Key words
white poplar/setting of compressive deformation/air medium/steam medium/set recovery/chemical components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..基于空气与蒸汽介质组成比及其压力调控的木材压缩变形永久固定[J].木材科学与技术,2025,39(4):2-20,19.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）
