Introduction to the Working Principle of a Dehumidifying Dryer (Standard Type)

Dehumidifying dryer (standard type) combines dehumidifying, drying, and two-stage feeding functions, which is particularly suitable for moisture-absorbing engineering plastic raw materials such as PA, PET, PC, and PBT. The optical grade model can be used in the production process of optical grade products such as lenses, LCD light guide plates, and optical discs, with a dew point of up to -50℃ in ideal conditions.

The Dehumidifying, Drying, and Feeding Three-in-one series is suitable for places with high automation and compact space, which integrates drying, dehumidifying, and feeding functions into one. The entire system adopts IC control and is simple to operate. A dew point calculator that allows monitoring of the machine's dehumidifying effect is also available for selection. Recently, in accordance with European design requirements, the appearance of the machine has become more attractive, its performance more stable, and its energy consumption lower.

Working Principle of the Dehumidifying dryer (standard type)

Dehumidifying and Drying Part

The dehumidifying dryer cools the hot and humid air coming back from the drying hopper and introduces it into the honeycomb rotor. Water in the air is adsorbed by the rotor and then desorbed by the regenerated hot air. The two air flows act on the rotor simultaneously and, with the rotation of the rotor, the water in the air is adsorbed continuously and desorbed and discharged by the regenerated air, forming stable low-dew-point air. This air is heated to the drying temperature of the plastic and blown into the drying hopper to form a closed cycle and dry the raw material.

Feeding Part

The material is sucked into the drying hopper from the material storage bin or other storage container. When the magnetic switch of the vacuum hopper detects that there is no material, the suction motor runs, creating a vacuum in the vacuum hopper, and the material in the storage bin is sucked into the vacuum hopper due to the pressure difference in the air. After the feeding time is completed, the suction motor stops running, and the material falls into the drying hopper due to its weight. The dry material extracted from the drying hopper is then fed into the photocell hopper installed on the plastic molding machine.

Relative Humidity and Dew Point of the Dehumidifying dryer (standard type)

Relative Humidity

The percentage of the actual water vapor density in the air to the saturated water vapor density at the same temperature is the relative humidity of the air.

Dew Point

The temperature at which saturated water vapor condenses in the air is the dew point temperature. When the relative humidity is 100%, the temperature of the surrounding environment is the dew point temperature. The smaller the dew point temperature is compared to the temperature of the surrounding environment, the less likely dew will form, which means that the air is drier. The dew point is not affected by temperature, but by pressure.

The three-in-one dehumidifying dryer strictly controls the moisture in the raw material and is the key to processing high-quality plastic products. With a honeycomb rotor based on ceramic fiber, the drying air can easily reach a dew point of -40℃, and even up to -50℃ or lower in ideal conditions. The dew point temperature is stable, ensuring the physical properties (such as strength, hardness, and transparency) of the molded plastic products. The series product realizes automation, reduces the labor intensity of operators, and saves space.

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