期刊论文

Influences of temperature on surface color of poplar flour formed by warm compaction

中文

中国粉体技术

1008-5548

2019

25

4

76-80

10.13732/j.issn.1008-5548.2019.04.011

2018JJ2681:湖南省自然科学基金 2017GK2255:湖南省工业领域重点研发计划项目 2016JJ5009:湖南省自然科学基金-常德市联合基金 :湖南省高等学校科技创新团队支持计划

本校为第一机构

采用CIE（1976） L*a*b*系统和傅里叶红外光谱技术（FTIR）,研究温压成形过程中温度对木材颜色和表面化学成分的影响规律。结果表明,成形温度升高可导致试件表面颜色加深,明度值变化范围为37. 5%～79. 2%,红绿色品指数变化范围为53. 8%～207. 7%,黄蓝色品指数变化范围为22. 4%～110. 3%;成形温度在180～200℃时ΔE*相差1. 1,在180℃之前温度对杨木粉末的影响较为显著;随着温度的升高,半纤维素和木质素开始软化,导致试件表面颜色加深;这2类物质的降解主要存在侧链上,半纤维素降解程度高于纤维素和木质素。

Influences of temperature on surface color and chemical composition of poplar flour formed by warm compaction were investigated by CIE(1976) L*a*b * system and fourier transform infrared spectroscopy(FTIR).The results show that the surface color darkens with the forming temperature increasing.Brightness value varies from 37.5% to 79.2%,red-green product index ranges from 53.8% to 207.7% and yellow-blue product index ranges from 22.4% to 110.3%.The difference of Δ E * is 1.1 when forming temperature is between 180 ℃ and 200 ℃.When temperature...