摘要
以过热蒸汽作为介质于185℃～215℃热改性7种国产阔叶材,分析窿缘桉、马占相思、荔枝木、刺槐、春榆、臭椿、橡胶木等木材热改性后心边材颜色的变化,考察不同处理对几种阔叶材心边材颜色的影响,为几种阔叶材工业热改性生产工艺优化及木材热变色规律提供试验依据。结果表明,(1)几种阔叶材185℃和200℃热改性后,对于心材树种,其心边材明度都显著降低,200℃明度低于185℃,且心材颜色仍较边材颜色深;(2)对于边材树种,热改性后木材明度也显著降低,200℃处理颜色亦比185℃深;(3)热改性后,马占相思等含有抽提物的心材树种木材颜色比橡胶木等不含抽提物的边材树种深;(4)热改性后窿缘桉木材的颜色变化,除了处理温度与处理时间对木材颜色有影响外,心边材也对其材色差异有显著影响。
Effect of heat treatment on the color changes of sapwood and heartwood from seven Chinese hardwoods using ThermoWood process was investigated.The samples were heat-treated using an experimental kiln at temperature 185°C-215°C for duration 1-5 hours.The colour parameters L＊ were determined on sapwood and heartwood of untreated and treated hardwoods.The results indicated that after heat treatment,the brightness L＊ of all the samples declines.With increase the temperature,both sapwood and heartwood brightness L＊ decreased and the colour of heartwood darkened than the sapwood.The discolouration during thermal treatment is mainly due to the treatment temperature than the treatment time.
出处
《木材加工机械》
北大核心
2012年第4期1-5,共5页
Wood Processing Machinery
基金
海南省重点科技计划项目(ZDXM20100019)
中央级公益性科研院所基本科研业务专项资金项目(1630022011016)资助
关键词
热改性
颜色
阔叶材
心边材
heat treatment
colour
sapwood
heartwood
