Toshiba Machine specializes in supply of De humidified Air Dryers for the drying of hygroscopic plastic resins. Hygroscopic resins lose many of the desirable properties if the moisture content is high. High performance dryers are needed to draw moisture out of these resins. 
A De humidified Air Dryer works by moving hot air through a bed of desiccant beads. These beads absorb moisture out of the air and the dry air then absorbs moisture when moving through the resin in the dryer. After a set time or when the dew-point of the air reaches a set-point, the dryer switches from one desiccant bed to another. The bed that was drying until now is then heated with very hot air. This hot air makes the desiccant give up the moisture they absorbed before. The desiccant is then cooled or let to cool at ambient temperature.