When the temperature of the drying room rises to about 30 °C, put the purple potato chips into the drying room. Afterwards, set the temperature to 40 °C, and set the drying time to 1-2 hours.
In the next step, the temperature is set to 45°C, and the drying time is 2-3 hours. Afterwards, the temperature is set to 60°C, and the drying time is 3 hours. At this time, the water content of purple potato chips should not exceed 10%.
After turning off the power, take out the dried materials after 1 hour, and then soften it at drying room for 1-2 hours. During this process, pick out the potato chips that do not meet the drying requirements and dry them again.