1 Preheating for 90 minutes in advance
The preheating time is determined according to different ambient temperatures. The main reason is that temperature rise needs to be carried out in a step-by-step method. Preheating is very important. The drying temperature should set at 46°C at the beginning and should continue for 90 minutes, and then the temperature is gradually raised to about 60°C. If the preheating temperature is too high, the bamboo shoots may burst into pulp.
2 drying & dehumidification mode for 300 minutes
The temperature is set to 45°C, the humidity is set to 50%, the drying room is kept at a constant humidity and at a stable temperature, and the relative humidity in the drying room is kept at 68%.
3 Drying & dehumidification: the temperature rises to about 55 ℃
After entering the bamboo shoot drying mode, dehumidify it for 30 minutes and stop for 5 minutes, and keep the relative humidity in the drying room at 50%. This mode should keep for 6 hours. At this stage, the color of the bamboo shoots is fixed to ensure that the color of the bamboo shoots is golden yellow.
4 Drying & dehumidification: the temperature is adjusted to about 60 ℃
The relative humidity of the drying room is kept at 35% for about 12 hours, and the moisture is slowly drained out to maintain a certain degree of dryness.
5 Drying is completed: the temperature is adjusted to about 65 ℃
The relative humidity of the drying room is kept at 15% for about 10 hours. This process will be finished until the bamboo shoots are completely dehydrated and dried into yellow or golden yellow.
6 packing the bamboo shoots into bags
The dried bamboo shoots should be cooled down. After the original heat of the bamboo shoots is dissipated and cool down to the normal temperature, they are classified according to the size and tenderness and then packaged and stored.