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高温水热处理对毛竹材颜色和平衡含水率的影响
陈宣宗,牛帅红,姜年春,王新洲,王丽,李延军
0
(南京林业大学材料科学与工程学院,南京210037;浙江农林大学工程学院,临安 311300;浙江省开化县林场,开化 311300)
摘要:
为提高竹制品加工利用水平,以高温水为传热介质,在温度为120℃、130℃、140℃、150℃,160℃,时间为60min、90min、120min的密闭条件下对毛竹(Phyllostachys heterocycla)进行高温热处理,以饱和蒸汽压控制试验的压力环境,研究毛竹材在不同水热处理条件下颜色及平衡含水率的变化。结果表明,随着热处理温度的升高和时间的延长,毛竹材表面颜色由明黄色向深咖啡色转变,红绿色品指数(a*)略微上升后下降,趋向于绿色,黄蓝色品指数(b*)逐步下降,趋向于蓝色。总体色差(ΔE*)增大,明度(L*)下降,竹材平衡含水率下降拐点出现在140℃,与热处理时间相比,热处理温度对竹材颜色及平衡含水率的影响更显著。
关键词:  毛竹  高温水热处理  竹材颜色  平衡含水率
DOI:10.13610/j.cnki.1672-352x.20191122.011
基金项目:“十三五”国家重点研发计划(2017YFD0600801), 国家自然科学基金(3197140672), 江苏省科技计划项目(BE2018391)和浙江省级重点研发计划课题(2019C02037)共同资助。
Effects of high temperature hydrothermal treatment on color and equilibrium moisture content of bamboo
CHEN Xuanzong,NIU Shuaihong,JIANG Nianchun,WANG Xinzhou,WANG Li,LI Yanjun
(Nanjing Forestry University, Nanjing 210037;School of Engineering, Zhejiang A&F University, Hangzhou 311300;Zhejiang Province Kaihua Forestry Farm, Kaihua 311300)
Abstract:
In order to improve the levels of processing and utilizing for sympodial bamboo,6 years bamboo(Phyllostachys heterocycla) was thermally modified under hot water, hydrothermal treatment temperature of 120℃,130℃,140℃,150℃,160℃, treatment time of 60 min,90 min,120 min. Research on the change of bamboo color parameters and equilibrium moisture content (EMC) with different process. The main conclusions re concluded as follows: With the improvement of hydrothermal treatment temperature and time, the color of bamboo gradually change from yellow to brown; a* decreases slightly and then falls, tending to green, b* gradually decreases, tending to blue. The value of ΔE* were increased, and had negative relation with L*,The equilibrium moisture content of bamboo decreased at 140℃; compared with hydrothermal treatment time,temperature on bamboo color and EMC had more significant impact.
Key words:  bamboo  high temperature hydrothermal treatment  color  equilibrium moisture content

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