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Why use a desiccant dryer for injection molding?


source:Dehumidifying dryer   release time:2021-04-30 16:29:46


With the widespread use of engineering plastics, dehumidification dryers have gradually replaced traditional hot air dryers. If you use a dehumidification dryer, it will bring you the following four major benefits:
1. The water in the plastic raw materials can be taken away to eliminate the generation of bubbles, so that the product can achieve very ideal mechanical, electrical, dimensional stability and smooth appearance.
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2. Prevent the production of defective products and the loss of returned goods, greatly reduce the generation of waste; make the product quality rate reach 99%, which greatly reduces the loss of materials,

3. Compared with the traditional hot air drying, the dehumidification dryer has good dehumidification effect and short dehumidification time. Because the dehumidification dryer uses very dry air for dehumidification, it can greatly shorten the drying time and save working hours. Create more profits;

4. The air pipeline of the desiccant dryer adopts a sealed circulation system and is equipped with a filter, so it is not affected by the outside climate, and can prevent dust from causing pollution in the factory, creating a beautiful working environment for you.
How to achieve the highest drying efficiency?
The determinants of a good drying efficiency have the following four points: drying temperature, drying time, air volume, and dew point. These four factors are interlinked, and any change in conditions 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 will be contained Part of the additives volatile or agglomerated, too low will make some crystalline raw materials unable to reach the required drying conditions, such as: PC/120℃, ABS/80~95℃. In addition, insulation and heat preservation are required 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.
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The air volume is the only medium to take away the moisture in the raw materials, and the air volume will affect the quality of the dehumidification effect. Too much air volume will cause the return air temperature to be too high, causing overheating 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 dehumidification dryer.
The dew point temperature refers to the temperature at which the moisture contained in a gas is cooled to a water droplet, and 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 dehumidification dryer must be able to reach a dew point temperature of -40°C