Onion is a multi-functional health food. Making dried onion can effectively extend its shelf life of onion. Natural drying in the sun will make the onion skin easy to necrosis when heated. In addition, the temperature is uncontrollable. Drying in the shade will cause the onion to be too wet and easy to rot.
If you want to mass-produce dried onions, we recommend that you use an onion drying machine. With this equipment, you can use medium and low-temperature hot air drying, which is conducive to timely moisture discharge. And the dried onions do not change color. The key is that the air energy onion drying equipment is very energy-saving equipment.
Onion drying process
1. Clean the onion
In the process of washing, select the onions with poor quality
2. Strip cutting
Then you need to slice the onion. Then place it evenly on the tray of the onion drying machine. It is important that do not over the stack, as this will affect the drying effect.
- Temperature: Generally, the water content of vegetables is relatively high. So it is necessary to set nonlow temperature hot air constant temperature drying. The high temperature will destroy the nutritional value of vegetables. The drying temperature of onion shall not exceed 50 ℃, and the dehumidification rate shall reach more than 20% during drying. The drying can be carried out in several stages. In the beginning, the temperature is set at 50~40 ℃, then 40~30 ℃, and finally drops to about 35 ℃.
- Drying time: the drying cycle of a batch of onions is about 15 hours. Quick-drying destroys the quality of onions.
- Humidity: there are certain sugars in the water of vegetables, so it is difficult to dehydrate. Therefore, it is crucial to control the dehydration rate.
Structure of onion drying machine
- Host: air energy heat pump drying dehumidifier.
- Drying room: polyurethane foam insulation warehouse. The drying room is used to place materials and keep warm to avoid heat loss.
- Hot air circulation system: the hot air circulation system can bring heat to every corner of the drying room to improve the temperature of the drying room. And take away the water evaporated from the material.
- Moisture removal and drainage system: condense the hot and humid air in the curing house into the water and discharge the excess water vapor through the fan.
Application fields of onion dryer
Our onion drying machine is suitable for drying all kinds of meat products, vegetables, fruits, food, medicinal materials, crops, and other materials. You can make full use of the different receiving seasons of different crops, use equipment time-sharing, and improve the utilization of equipment and funds.