The convey belt runs on the heating plate at a constant speed, and the internal heat source of heating plate can be steam, hot water or electrical heating, With the running of convey belt, the temperature is adjustable up and down according to the specific characteristics of material from evaporating and drying in the front to cooling discharging in the end.
https://www.sedmachinery.com/solid-preparation-equipment/vacuum-drying-machine/vacuum-dryer-for-fruit-and-vegetable.html