With the widespread use of engineering plastics, dehumidifying dryers have gradually replaced traditional hot air blowers and are increasingly used in the injection molding industry, bringing more benefits to enterprises. The following is a detailed introduction of why dehumidifying dryers are used in the injection molding industry?
Since most engineering plastics are hygroscopic, coupled with the influence of weather and regional climate, it is easy to cause the plastic particles to be too wet and unable to achieve the molding effect. In addition, in the previous granulation process, the plastic raw materials are different, so the moisture content and moisture absorption in the air are also different. Therefore, during the molding process, bubbles, silver bars, poor transparency, cracks and poor stability are likely to occur, which seriously affect the product quality. The air duct of the dryer adopts a closed circulation system, which is not affected by the external weather. The material can dry well in dry or humid weather without reversing moisture, and the product quality is high.
The dehumidifying dryer first sucks the air in the environment to remove the moisture in the low dew point air, and then heats the dried air into one or more standard drying funnels, which can improve drying efficiency and shorten drying time. If the traditional hot air blower uses the moisture in the outside air to dry the material, it is difficult to achieve the drying effect. In addition, when the plastic is taken out of the moisture-proof sealed packaging bag and exposed to the atmosphere, it will start to absorb moisture from the atmosphere. The traditional hot air blower cannot prevent the plastic from continuing to absorb moisture, and the drying effect is poor.
The use of desiccant dryers can be divided into independent and centralized. An independent dehumidification dryer usually includes a dryer host, 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 high drying efficiency and convenient and quick material change.
The centralized dehumidifying dryer includes a drying 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 the air volume control valve to control the air volume of each drying barrel. , Suitable for mass production of plastics.
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