In the Dryer Mixer with Dimple Jacket, the humid air is first removed so that it contains very low residual moisture (dew point). Then, lower the relative humidity of the air by heating it. At this time, the vapor pressure of the dry air is low. By heating, the water molecules inside the particles get rid of the binding force and diffuse into the air around the particles.
In the air surrounding the particle, it takes time for the heat to be absorbed and the water molecules to diffuse to the surface of the particle. Therefore, the resin supplier should specify the time it must take for a material to dry effectively at the proper temperature and dew point.
The dry hot air transfers heat to the pellets in the drying silo, removes moisture from the surface of the pellets, and sends the moisture back into the Dryer Mixer with Dimple Jacket. Therefore, there must be sufficient airflow to heat the resin to drying temperature and maintain this temperature for a certain period of time.