Drying process of dehydrated vegetables
date:2021/04/15 15:32writer:admin
There are two kinds of dehydration methods for dehydrated vegetables: natural sun drying and artificial dehydration. Artificial dehydration includes hot air drying, microwave drying, puffing drying, infrared and far infrared drying, vacuum drying and so on. At present, hot air drying and freeze vacuum drying are widely used in vegetable dehydration. In the process of processing dehydrated vegetables, drying is an essential process. Most of the drying processes of different kinds of vegetables are similar
Dehydrated vegetables
1. Cooling and softening process. It can dehydrate about 3% at the temperature of 10 ° to 20 ℃.
2. Low temperature dehydration process. The temperature is 35-40 ℃, the retention time is 60-80 min, and the dehydration rate is 5-8%.
3. Heating process of dryer. In order to keep vegetables in a stable environment with a temperature of 60 ℃ when they enter the high-temperature drying section, the dryer should be preheated before feeding, so that the temperature in the dryer can be stabilized at 60 ℃.
4. High temperature dehydration drying process. The retention time is about 80% ～ 60 min.
