There are several things to note when using a mesh belt dryer to dry onions:

1. Clean the onions: Before drying, make sure the surface of the onions is clean. Remove any dirt or residue and peel it off.

2. Cut evenly: Cut the onions into uniform slices or thin slices to ensure they are heated evenly during the drying process.

3. Control the temperature: When using the dryer, ensure that the temperature is controlled within the appropriate range. Onions should generally be dried at a temperature between 50°C and 60°C to avoid overdrying or burning.

4. Good ventilation: Make sure the dryer has a good ventilation system to expel the moisture and steam released from the onions. This helps speed up the drying process and prevents the onions from spoiling.

5. Turn the onions: During the drying process, turn the onions regularly to ensure they heat evenly and to avoid clumping or sticking together.

6. Make sure it is completely dry: Make sure the onions are completely dry without any wet or soggy parts. This helps extend the shelf life of the onions and prevents the growth of mold and bacteria.

7. Store properly: Once the onions are dry, store them in a dry, clean, airtight container to ensure their long-term preservation.

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