What is the basic principle and dew point of a dehumidifier dryer?

The following is an introduction to the basic principle and dew point of a dehumidifier dryer.

1) Basic principle

Dehumidifiers are mainly used to dry plastics with strong hygroscopicity. The principle is to send the dehumidified low dew point air into one or more standard drying hoppers to improve drying efficiency and shorten drying time.

2) Relative humidity and dew point

The moisture content expression method is mostly used for solids or liquids. When used for gases, this concept is not applicable.

Water vapor partial pressure (Pw): refers to the water vapor pressure in air or gas.

Saturated water vapor pressure (Pws): refers to the maximum pressure in water vapor at a specific temperature. The higher the temperature, the more water vapor the air can withstand.