The factors that affect the drying effect of dehumidifying dryers are as follows:
1. Dew point:
In the plastic desiccant dryer, the humid air is first removed to make it contain very low residual moisture (dew point). Then, heat the air to reduce its relative humidity. At this time, the vapor pressure of dry air is low. By heating, the water molecules inside the particles get rid of the binding force and diffuse to the air around the particles.
2. Drying temperature:
Heat is the key to unlock the force between the water molecules and the hygroscopic polymer. When the temperature is higher than a certain temperature, the attraction between water molecules and polymer chains will be greatly reduced, and the water vapor will be taken away by the dry air.
3. Airflow:
The dry hot air transfers heat to the particles in the drying silo, removes moisture on the surface of the particles, and then sends the moisture back to the plastic dryer. Therefore, there must be enough airflow to heat the resin to the drying temperature and maintain this temperature for a certain period of time.
4. Time:
In the air around the particles, it takes a certain time for the absorption of heat and the diffusion of water molecules to the surface of the particles. Therefore, the resin supplier should specify the time it takes for a material to be effectively dried at the appropriate temperature and dew point.
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