Since most engineering plastics are hygroscopic, coupled with the influence of weather and regional climate, it is easy to cause the plastic pellets to be excessively wet and fail to achieve the molding effect. In addition, the plastic raw materials are different in the previous granulation process, so the air moisture content and hygroscopicity are also different. Therefore, during molding, bubbles, silver bars, poor transparency, cracks, and poor stability are likely to occur, which seriously affect product quality. The air pipeline of the desiccant dryer adopts a closed circulation system, which can not be affected by the external weather. The material can be dried well in dry weather or wet weather, without reversing moisture, and the product quality is high.
The desiccant dryer first draws the air in the environment to remove the moisture in the air under low dew point, and then heats the dried air into one or more standard drying hoppers, which can improve the drying efficiency and shorten the drying time. If a traditional hot air blower uses moisture with external air to dry the material, it is difficult to achieve the drying effect. In addition, when the plastic is taken out from the moisture-proof sealed packaging bag and exposed to the atmosphere, it will begin to absorb moisture from the atmosphere. Traditional hot air blowers cannot prevent the plastic from continuing to absorb moisture, and the drying effect is poor.
The use of desiccant dryers can be divided into stand-alone and centralized. The stand-alone dehumidification dryer usually includes a dryer mainframe, a drying barrel, and a suction machine. The stand-alone dehumidification dryer is suitable for a small amount of various drying, and its advantages are good drying efficiency and convenient and quick material change.
The centralized dehumidification dryer includes a dryer host and several drying barrels. Each drying barrel has an independent heating controller, which can dry several different raw materials at the same time, and cooperates with an air volume control valve to control the air volume of each drying barrel. , Suitable for mass production of plastics.
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