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Method for improving product dimensional accuracy during molding process of plastic granulator
In recent years, driven by the rapid development of China's economy, plastic granulators have also begun to develop at a high speed. China is a famous plastics producing country in the world. The innovative technology of plastic granulators is closely related to the development of plastic products in China. In 2010, the national output reached 8.42 million tons, an increase of 31.1% year-on-year, ranking first in the world. During the “Twelfth Five-Year Plan†period, the growth rate of plastic granulator production will remain at around 10%. By 2015, the national plastic granulator production capacity will be close to 12 million tons. The plastic granulator will occupy the market in all kinds of pipelines nationwide. The rate will exceed 60%.
The export pressure of plastic granulators has been affected by various factors and there are large fluctuations, which will inevitably affect the dimensional accuracy of the products. If a melting is added between the outlet of the granulator and the die. The body pump can be used to stabilize the outlet pressure fluctuation of the granulator, thereby improving the dimensional accuracy of the plastic products. The following is a method for improving the dimensional accuracy of the three plastic granulators during the molding process of the plastic granulator:
1. Increase production, reduce energy consumption, achieve low temperature extrusion, and extend the life of the machine. The extruder can work under low pressure and low temperature conditions, the leakage flow is greatly reduced, and the output is increased. The gear pump can more easily and effectively establish the head pressure than the extruder, and can reduce the back pressure of the extruder, so that the axial force of the screw is reduced and the service life is prolonged.
2, to achieve stable extrusion, improve the dimensional accuracy of extruded products, reduce the rate of waste, uneven material feeding, fluctuations in barrel and head temperature, pulsation of screw speed is difficult to avoid. The use of the melt gear pump can eliminate the feeding error of the feeding system, can greatly reduce the fluctuation of the upstream process transfer, quickly enter a stable working state, improve the dimensional accuracy of the extruded product, and reduce the scrap rate.
3. Since the working speed of the upstream and downstream equipment and the gear pump can be determined, the information such as the pressure and temperature collected at the inlet and outlet of the gear pump can be used to realize the online monitoring and feedback control of the entire plastic granulator extrusion process.