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Talking about the method of plastic dehumidification and drying

Release time:2021-08-20 09:17:24  Source:Plastic dryer  Author:Plastic dryer
Since most engineering plastics are highly hygroscopic, it is necessary to dehumidify and dry the raw materials. There are many kinds of plastic drying methods. When choosing plastic drying methods, we must be pertinent. For different materials, choose reasonable plastic drying methods, so as to achieve the fastest and most effective drying effect. So what are the plastic drying methods? Below, Hengrong Machinery will organize and introduce for you.
1. Vacuum plastic drying method:
The vacuum drying equipment consists of three cavities installed on a rotating conveyor belt. At the first cavity, when the rubber particles are filled, a gas heated to a drying temperature is introduced to heat the rubber particles. At the gas outlet, when the material reaches the drying temperature, it is moved to the second cavity evacuated. Under normal circumstances, the residence time of the material in the second cavity is 20min to 40min, but for some materials with strong hygroscopicity, it needs to stay at most 60min. Finally, the material is sent to the third chamber, and thus removed from the dryer.
2. Convection plastic drying method:
For non-hygroscopic materials, you can use a desiccant dryer for drying. Because the water is only loosely constrained by the interfacial tension between the material and the water, it is easy to remove. The principle of this type of machine is to use a fan to absorb the air in the environment and heat it to the temperature required to dry a specific material. The heated air passes through a drying hopper and heats the material by convection to remove moisture. The heated gas is continuously heated to the regeneration temperature through the molecular sieve until it reaches a specific temperature when it leaves the molecular sieve.
3. Infrared plastic drying method:
When using infrared drying, because the molecules are irradiated by infrared rays, the absorbed energy will be directly converted into thermal vibration, which means that the heating of the material is faster than in convective drying. Infrared drying and vacuum drying are new technologies in plastic processing. The application of these new technologies greatly shortens the residence time of materials and reduces energy consumption.
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