Onion is a perennial herb of Liliaceae and Allium. The harvesting time of onions is generally from the end of May to the first ten days of June. In our daily life, fresh onions are generally used as vegetables, while dried onions are generally used in food and chemical industries. Do you want to know the onion drying process? Today we will give you a detailed introduction.
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In the onion drying process, it is necessary to pay attention to temperature, humidity and drying time.
- Temperature: The drying temperature of onion should not exceed 50 ℃, and the dehumidification rate should reach more than 20% when drying. Drying can be carried out in several stages. The initial drying temperature is set at 50-40 ℃, the second stage is set at 40-30 ℃, and the third stage will be reduced to about 35 ℃.
- Humidity: For vegetables with high moisture content, the moisture discharge must be controlled. Because this is also one of the important factors that determine the drying quality.
- Drying time: The drying cycle of onions is generally about 15 hours. Rapid drying will damage the drying quality.
How to dry onions commercially?
The water content of onions is relatively high. The traditional onion drying method takes a long time and is easy to breed bacteria. With the development of food technology, most food processing plants use onion dryers to dry onions. In the onion drying process, the onion dryer machine generally adopts the method of low temperature hot air and constant temperature drying. Because high temperature will destroy the nutritional value of vegetables and make them lose nutrients.
Onion dryer machine adopts the drying technology of hot air circulation, which is also the best way to dry onions. If you need an onion dryer, please feel free to contact us. In addition, you can also use this machine to dry vegetables, fruits and traditional Chinese medicine such as chilli.