林业工程学报2020，Vol.5Issue(6)：64-75,12.DOI:10.13360/j.issn.2096-1359.202003012
植物油蜡涂饰热改性落叶松的色度学差异性分析
Chromatic variability of larch wood impacted by high-temperature thermal treatment and oil-wax coating
摘要
Abstract
In terms of aesthetical perception,color is one of the most fundamental physical properties of wood materials,and surface color differences have decisive influences over the customer's acceptance of solid wood products.This study investigated the effect of thermal treatment and surface oil-wax coating on the chromatic variability of larch wood.Green larch lumber samples were kiln-dried with conventional technology and further high-temperature thermally treated in atmospheric superheated steam conditions.Subsequently,the larch samples were surface-painted with the transparent oil-wax coating,and the colorimetric variables of the earlywood and latewood of specified larch samples were further determined separately by a specially designed image colorimetry method.The colorimetric variable differences between the earlywood and latewood were calculated,aiming at quantitatively analyzing the chromatic variability of larch earlywood and latewood in specified cases.Comparing with the kiln-dried samples,under the circumstance of N2 oil-wax coating option and thermal treatment at 180 ℃ for 1 h,the saturation variable difference △S * between the earlywood and latewood increased by 60.8％,while the general colorimetric variable difference △E* remained at the same magnitude level.The variability mechanism behind the chromatic alterations of larch samples,induced by the combination of thermal treatment and surface oil-wax coating,was proposed as the interaction between the existing chromogen groups and the newly emerging ones brought about by these technical processes.Due to the inhomogeneous distribution of resin contents inside each annual ring,the latewood tissue,which contains more resin canals than the earlywood,could act as the diffusion barrier for the oil-wax compound and postpone the penetration of plant oils.In the light of this circumstance,the disrupt distribution behaviors of larch resins partially contributed to the chromatic variabilities between these two types of wood tissues.The test results demonstrated that a proper combination of thermal treatment and oil-wax coating could be used for improving softwood colorimetric properties,enhancing the surface characteristics of larch wood,promoting it as a sustainable alternative wood resource.关键词
色度学差异/木材室干/落叶松/油蜡涂层/热处理Key words
chromatic variability/wood kiln-drying/larch/oil-wax coating/thermal treatment分类
农业科技引用本文复制引用
张镜元,达妮娅,张宝元,战剑锋..植物油蜡涂饰热改性落叶松的色度学差异性分析[J].林业工程学报,2020,5(6):64-75,12.基金项目
Fundamental Research Funds for the Central Universities of China(2572019CJ01) （2572019CJ01）
Northeast Forestry University Undergraduate Innovation Training Project (201910225160).中央高校基本科研业务费专项资金C类(2572019CJ01) （201910225160）
东北林业大学大学生创新创业项目(201910225160). （201910225160）
