蒸汽高温处理工艺对竹材软化效果的影响

Effect of Softening of Bamboo Specimen Treated by Steam

以毛竹(Phyllostachys heterocycla cv.pubescens)材为研究对象,研究蒸汽高温处理温度、处理时间和毛竹初始含水率对毛竹抗弯弹性模量与静曲强度的影响。180℃蒸汽软化处理5 min后试件自身温度下降规律,结果表明,随着处理温度的升高和时间的延长,试件弹性模量与静曲强度均呈下降趋势,并且在处理温度为160-200℃时,其力学性能下降最快;180℃软化处理5 min后,初含水率为114%的泡水试件较初始含水率为11%的气干试件,静曲强度和弹性模量分别下降了51.8%,27.9%;蒸汽高温处理对竹材具有较好的软化效果,但处理后试件温度下降过快会导致其力学性能升高、塑性降低,不利于展平,在实际生产中应快速高效的进行软化展平,适当提高生产环境温度。

Experiments were conducted on MOE and MOR of bamboo specimen treated by steam softening treatment with 5 diffenrent temperatures and 2 durations. And temperature of specimen were determined treated by temperature of 180℃ and duration of 5 minutes. The results showed that MOE and MOR decreased with the increase of softening temperature and duration, especially at temperature of 160℃ - 200℃. MOR of bamboo specimen with initial moisture content of 114% decreased by 51.8% and MOE decreased by 27.9% compared with speciment with initial moisture content of 11%. The experiment concluded that treatment of temperature at 180℃ and duration of 5 minutes had better softening effect.Recommandations were made on high moisture content of specimen and suitable factory temperature..