The vacuum technology of degassing, drying and transfer can be used in various processes of plastic industry.
1. Extruder degassing
During the processing, the thermoplastic melts in the extruder and degasses in the threaded part of the extruder.Vacuum devices are used to extract gases and vapors from melts. All low molecular weight substances were extracted to obtain the best quality of thermoplastic plastics with smooth shape, higher strength, better insulation performance and lower gas generation rate.
2. Shaping platform （section）
The continuous profile of the molten and degassed plastic material in the extruder enters the forming station.Typically, these profiles are in pipes or in different technical profiles, such as windows, grooves, and medical pipes.Plastic material is pulled into the die. In order to cool and lubricate, a water film is formed between the inner part of the plastic mould and the continuous working parts, and the air is pumped steadily by the vacuum pump.
3. EPS Foaming
In the production of EPS parts and moulds, the pre-expanded polystyrene was first blown into the moulds by side channel fan, and then pressurized by steam.Finally, the product is gathered and “baked“ into the mold.In order to avoid deformation in this process-for large parts, it is easy to use 3 to 4 minutes-parts must be cooled.Vacuum devices are used for these components to ensure they are not deformed and the moisture therein evaporates quickly.The heat generated during the evaporation process is excluded from the workpiece, which accelerates the cooling process.
Before the spherical material enters the extruder for further treatment, it is conveyed to the dryer by pneumatic conveyor belt （see below）.The dryer is a closed system with hot air circulation.The air in the dryer absorbs the moisture from the spherical material and drains it out through the desiccant.The desiccant itself must be blown with hot air before it can be reused.
5. Pneumatic conveyor
At different stages of production, plastic spherical materials must be transferred from one place to another.G. From tank to dryer）.The pneumatic conveying device can be realized automatically and can speed up. Pipes are laid from the starting point to the end point and connected to a vacuum pump or compressor.
The air in the pipeline is “loaded“ to transport materials – it can stir leaves, or have typhoon strength, or even lift roofs from houses, as compared with hurricanes, depending on wind speed. According to the weight of the goods and the length of the pipeline, the design of the system can make the vacuum pump （vacuum transfer） or compressor （pressure transfer） generate enough wind speed to pick up materials and transfer them to the destination without leaving them in the pipeline.
Since pneumatic conveyor is used to transport large amounts of dust from plastic spherical materials, a filtration system is recommended.
6. Gas extraction and vinyl chloride compression
In the process of polyvinyl chloride production, vinyl chloride gas is polymerized under the pressure of autoclave to form polyvinyl chloride.At the same time, the produced gas is sucked, compressed and liquefied.
The above is the application of vacuum pump in plastic industry summarized by our company.I hope it can help you.
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