Moisture absorption is based on the principle of adsorption. This method involves removing moisture from the air by absorbing it with hygroscopic materials. For drying with this method, adsorption dryers are used, the main elements of which are: a rotating drum (rotor) with a drive unit, fans, air heater, filter, housing and accessories. The drum is most often made of appropriately profiled aluminum sheets (forming axial capillaries), the surface of which is covered with a hygroscopic substance. This design significantly increases the moisture-absorbing surface. The rotor is divided into a dehumidifying sector and a regeneration sector, resulting in dehumidified air behind the rotor. The advantage of this type of dehumidification is the possibility of dehumidifying air at a temperature below 0 ° C.