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How to Make a Microwave Vacuum Dryer with a Turntable

机译：如何制作带转盘的微波真空烘干机

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A domestic microwave oven was adapted in order to operate as a microwave vacuum dryer with turntable. The dryer performance was assessed with 5 mm thick slices, dried under vacuum at three different levels of microwave power: 400, 700 and 1000 W. The experimental results showed that it is possible to produce dried bananas with similar characteristics as those obtained from a freeze-drying (FD) process, but taking much shorter process times, i.e. 20 minutes against 10-12 hours. The system developed in this work is a low cost, flexible and ease-to-assemble device, which can be easily made from domestic microwaves. It allows microwave vacuum drying (MWVD) of fruits and vegetables at lab scale, but can be the basis for making larger equipment. Vacuum drying is particularly suitable for products that are sensitive to heat, such as fruits with high sugar content and certain vegetables with high added value [1]. Microwave heating under vacuum improves the efficiency of drying and prevents or reduces oxidation, preserving product color, texture and flavor, leading to products with quality compared to freeze-dried products [2]. The use of turntable during the drying process is important to improve the quality of the dried fruits as a result of fast and more uniform heating. Literature reports many studies on MWVD of fruits and vegetables, like banana [3], among others, although these studies did not report the use of turntables. The new device was tested for drying banana slices, which were also freeze-dried in order to compare processes and products.
机译：家用微波炉采用，以便作为带转盘的微波真空干燥器操作。用5mm厚的切片评估干燥器性能，在三种不同水平的微波功率下真空干燥：400,700和1000W。实验结果表明，可以生产具有类似特性的干香蕉，因为从冻结获得的那些。 -DRING（FD）工艺，但采取更短的过程时间，即20分钟的10-12小时。在这项工作中开发的系统是一种低成本，灵活，易于组装的设备，可以轻松由家庭微波制成。它允许在实验室规模的水果和蔬菜的微波真空干燥（MWVD），但可以是制造较大设备的基础。真空干燥特别适用于对热敏感的产品，例如具有高糖含量的水果和具有高附加值的某些蔬菜[1]。真空下的微波加热可提高干燥的效率，防止氧化，保存产品颜色，质地和风味，与冷冻干燥的产品相比具有质量的产品[2]。在干燥过程中使用转盘是重要的，因为快速更均匀的加热，因此在改善干果的质量方面是重要的。文献报告了许多关于水果和蔬菜MWVD的研究，如香蕉[3]，虽然这些研究没有报告转盘的使用。测试新设备用于干燥香蕉切片，该切片也会冷冻干燥，以比较工艺和产品。

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