目的 研究微波辅助加热处理条件下梓木的弯曲工艺。 方法 当微波处理频率一定时,分析比较梓木浸水材与尿素浸泡材的软化弯曲性能差异,探讨微波处理时间、木材初含水率以及微波处理功率等工艺因素对梓木软化效果的影响。 在单因素实验基础上,采用响应面法建立二次回归模型,并对微波辅助软化弯曲工艺进行优化。 结果 梓木经尿素浸泡处理后弯曲性能得到明显提高,且微波处理时间、木材初含水率以及微波处理功率等工艺因素对梓木软化弯曲性能影响显著。 结论 当微波处理时间为 2 min、初含水率为 40% 、微波处理功率为 500 W 时,梓木的最小弯曲半径比 h / r 能达到 1 / 5。

Objective To study the bending process of ovata catalpa during microwave-assisted heating. Methods The difference of bending performance between urea and water soaking ovata catalpa wood was explored under constant microwave frequency. The influences of microwave processing time, wood moisture content and microwave power on the softening effect of ovate catalpa were discussed. A quadratic regression model was established with response surface methodology based on single factor experiments,and the process was optimized. Results The results showed that urea soaking could obviously improve the wood bending performance, and the process factors of microwave processing time, wood moisture content and microwave power had significant effects on wood bending performance. Conclusion The compression strain could reach 16. 3% and the value of h / r could reach 1 / 5 when the microwave processing time was 2 min, the wood moisture content was 40% and the microwave power was 500 W.