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EFFECTS OF ULTRASOUND ON WOOD VACUUM DRYING CHARACTERISTICS

机译：超声对木材真空干燥特性的影响

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Ultrasound was examined as an alternative way to assist wood vacuum drying in this paper. Drying tests were carried out at three absolute pressure levels at 25°C to determine the effects of ultrasound and absolute pressure levels on the drying characteristics. A microscopic analysis was also carried out to visualize the formation of microchannels and view any other changes to wood tissue structure that occurred. Results showed that ultrasound could improve wood temperatures during the drying process, and the final temperatures increased with decreasing absolute pressure levels. The temperature decreased with increasing ultrasound propagation distance. Ultrasonic waves also could create microchannels within the tissue of wood samples. For the ultrasound-vacuum combined dried samples, there were some ruptures and small holes on the wall of vessel; some pits were abscission, extracts in wood ray cells were removed, and pits on parenchyma were punctured. These changes provide the passageways for water leaving from wood, and thus improve the drying rates and decrease the drying time.
机译：本文研究了超声作为辅助木材真空干燥的替代方法。在25°C的三个绝对压力水平下进行干燥测试，以确定超声波和绝对压力水平对干燥特性的影响。还进行了显微镜分析，以可视化微通道的形成并查看发生的木材组织结构的任何其他变化。结果表明，超声波可以提高干燥过程中的木材温度，最终温度随着绝对压力水平的降低而升高。温度随着超声传播距离的增加而降低。超声波还可能在木材样品的组织内产生微通道。对于超声-真空混合干燥样品，在容器壁上有一些破裂和小孔。去除一些凹坑，去除木射线细胞的提取物，并穿刺薄壁组织上的凹坑。这些变化为水从木材中流出提供了通道，从而提高了干燥速率并减少了干燥时间。

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    《Pro Ligno》 |2013年第4期|共7页
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    P.R. China;

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