The advantages of using a desiccant dryer: It can take away the water in the plastic raw materials to eliminate the generation of bubbles, so that the product can achieve ideal mechanical, electrical, dimensional stability and appearance. So what are the technical indicators of the desiccant dryer?
◆ Prevent the production of defective products and return losses, and reduce the production of waste.
◆ Because the desiccant dryer uses very dry air to dehumidify, it can shorten the drying time and save working hours.
◆ The air pipeline of the desiccant dryer adopts a closed circulation system and is equipped with a filter, so it is not affected by the outside climate, and it can prevent dust from causing pollution in the factory and improve the working environment.
The determinants of a good drying efficiency are: Drying Temperature, Residence time, Air flow, and Dew point. These four factors are interlinked, and any one of the conditions changes. Will affect the drying effect.
◆ Drying temperature refers to the temperature of the air entering the drying barrel. Due to its physical properties, such as molecular structure, specific gravity, specific heat, moisture content and other factors, the drying temperature has certain restrictions. If the temperature is too high, the raw material Part of the additives in volatile deterioration or agglomeration, too low will make some crystalline raw materials can not meet the required drying conditions, such as: PC/120℃, ABS/80～95℃. In addition, insulation and heat preservation are needed in the selection of dry barrels to avoid loss of drying temperature, resulting in insufficient drying temperature or waste of energy.
◆ Drying time refers to the pre-drying time of raw materials before molding. Too long drying time will cause raw materials to deteriorate or agglomerate or waste energy. Too short drying time will cause excessive moisture content. For example: PC/3-4 hours, ABS/3-4 hours.
◆ The air volume is the medium that takes away the moisture in the raw materials, and the air volume will affect the dehumidification effect. Too much air volume will cause the return air temperature to be too high, causing over heat and affecting the stability of the dew point. If the air volume is too small, the moisture in the raw materials cannot be completely taken away. The air volume also represents the dehumidification capacity of the desiccant dryer.
◆ Dew point temperature refers to the temperature when the gas is cooled to the temperature at which the contained moisture condenses into water droplets. It is a unit for measuring the degree of dryness (moistness) of the gas. The less moisture in the gas, the lower the dew point temperature. The dew point of a good desiccant dryer should be able to reach a dew point temperature of -40°C.
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