There are four factors that determine a good drying efficiency: DryTemperatur, Drytime, Airflow, and Dewpoint. These four factors are interlocking, and any change in conditions will affect the drying effect.
Dehumidifying dryer
The drying time refers to the time of pre-drying before the raw material is formed. If the drying time is too long, the raw material may change or agglomerate or waste energy. When the drying time is too short, the moisture content may be too high. For example: PC/3 to 4 hours, ABS/3 to 4 hours.
DryTemperatur refers to the temperature of the air entering the drying tank. Each raw material has a certain limit due to its physical properties, such as molecular structure, specific gravity, specific heat, moisture content, etc., and the temperature is too high. The local additives in the raw materials are volatile or agglomerate. Too low will make certain crystalline materials not reach the desired drying conditions. For example: PC/120°C, ABS/80 to 95°C. In addition, the dry barrel selection needs insulation insulation to avoid the loss of drying temperature, resulting in lack of drying temperature or energy waste.
Dewpoint refers to a unit that measures the dry (wet) level of gas when the gas is cooled to a temperature at which the moisture contained is condensed into water droplets. The less moisture in the gas, the lower the temperature. A good dehumidifying dryer can reach a temperature of 40°C.
Airflow is the only medium that removes moisture from raw materials. The amount of air volume affects the dehumidification effect. If the air volume is too high, the return air temperature will be too high, causing overheating and affecting the stability of the air. If the air volume is too small, the moisture in the raw materials cannot be completely removed. The air volume also represents the dehumidification capacity of the dehumidifying dryer.
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