Application of dry vacuum pump in plastic industry ，dry vacuum pump is a kind of pump body with many uses at present, its application fields are all over various industries, among which it can be used as degassing device of extruder, gas conveying device, gas extraction and compression device in plastic product processing industry. We can learn about this knowledge in detail through the following information:
In the degassing process of extruder, thermoplastic plastics melt in extruder and Degas in extruder screw. The dry vacuum pump is used to extract gas and steam components from the melted material. Extract all low molecular substances to obtain ideal thermoplastic quality, with smooth shape, higher strength, better insulation performance and lower gas generation rate.
A continuous section on which plastic materials melted and degassed in an extruder enter the setting table. The typical cross-section includes pipes, door and window materials, trunking and medical pipes, etc. The plastic material is drawn into the mold. For cooling and lubrication, a water film is formed between the inner side of the mold and the continuous working parts, and the air is stably evacuated by the dry vacuum pump.
In the production of EPS foam, the pre expanded polystyrene particles are first sucked into the mould by dry vacuum pump, and then pressurized by steam. Finally, it is polymerized and foamed into foam products. In order to avoid deformation in this process, it is easy to exceed 3 to 4 minutes for large-scale products. The product must be cooled. In the foaming device of these products, vacuum pump is used for cooling to ensure that they will not deform, and the moisture in them will evaporate quickly. The evaporation process absorbs the heat of the product and accelerates the cooling process.
In different stages of production, the plastic ball material must be transferred from one location to another (such as from the storage tank to the dryer). It can be realized automatically by adopting pneumatic conveying device, and the conveying speed can be accelerated. The pipeline is arranged from the start point to the end point and connected to the dry vacuum pump or compressor. Because of transporting materials, the air in the pipeline “loads” very fast, which can be compared with hurricanes. According to the weight of the material and the length of the pipeline, the design of the system can make the vacuum pump (vacuum transfer) or the compressor (pressure transfer) generate enough wind speed to pick up the material and transfer it to the destination without accumulating in the pipeline.
In the process of PVC production, the vinyl chloride gas is polymerized under the pressure of autoclave to form polymerized PVC. At the same time, the gas produced is extracted, compressed and liquefied.
The application of several dry vacuum pumps in plastic industry is introduced. Using this kind of pump can obtain clean high vacuum and ultra-high vacuum environment, so it will not affect the quality of processed plastic products, which is a main feature of dry pump different from other vacuum pumps, but also the reason why many industries choose it.