Microwave drying: microwave heating method to dry vegetables into "dry vegetables" with a moisture content of less than 20%. Compared with the traditional method, the efficiency can be increased by more than ten times. This method is not only suitable for the drying of vegetables, but also for the drying of seaweed foods. Experiments have shown that the microwave-dried vegetables are close to the freeze-dried products in tissue and fresh vegetables, but their drying time is shorter than freeze-drying. Microwave can also be used to dry the fried products, which not only saves oil, but also obtains light and delicious foods with low oil content. Dry the dough with hot air for 5~8h to avoid crust or cracking. Dry the microwave for only 1~2h, dry from the initial moisture content to 20%, and take away the moisture with hot air to save 25%. Drying with microwaves can also reduce bacterial contamination, such as hot air and microwave combined drying of garlic, hot air drying from 80% to 10% (wet basis), then drying to 5% with microwaves, the total number of bacteria is reduced by 90%, energy saving 30 %. Under vacuum, microwaves can handle materials that deteriorate or degrade at temperatures above 40 ° C (sometimes even at 15 ° C). Vacuum ovens can only pass heat conduction, usually without convection heating, and have a long drying time. Microwave vacuum drying products include fruit juice, tea powder, enzymes, vegetables (mushrooms, garlic, soybeans, etc.), and the operating cost is between spray and freeze-drying. In these systems, the material is usually a paste-like material that is placed on a conveyor belt and passed through a specially manufactured tunnel (vacuum degree 133.3 to 2666 Pa) to form a bubble. Rehydration performance is good.
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