How to ensure the stability of PET melt pump speed?
In a continuous PET device, the melt from the final polymerization kettle needs to be transported to the granulator and corresponding downstream spinning system through a thermoplastic extrusion pump; How to ensure the stability of PET melt pump speed is the key to determining product quality. Zhengzhou BATTE thermoplastic melt pump manufacturer provides a PLC control system, which can accurately regulate the speed of the melt pump and achieve the goal of output control. The speed of the melt pump is usually controlled by flow or pressure, and the advantages and disadvantages of each will be explained in detail below.
thermoplastic extrusion pump
In continuous PET production, maintaining the stable speed of the melt pump is of great significance for the material balance and stability of the entire production. The speed of the thermoplastic extrusion melt pump can be flexibly selected based on the focus of control, whether to use flow control or pressure control. Adopting flow control has the advantages of direct control and intuitive flow display; Its disadvantage lies in the increased pressure before the pump caused by particle cutting and spinning, which is not easy to stabilize. Adopting pressure control, its advantages are reflected in timely and sensitive pressure regulation, and stable pressure in the subsequent system; Its disadvantage lies in the poor matching between the actual flow rate of the melt pump and the required output. Whether the speed of the melt pump is controlled by flow or pressure, the flow rate of the melt pump is affected by the volumetric efficiency of the pump. In actual production, by incorporating the calculation formula for the volumetric efficiency of the pump into the calculation formula for the flow rate of the melt pump, the displayed flow rate of the melt pump can be kept consistent with the actual flow rate value, better ensuring the stable operation of the entire continuous production line.
thermoplastic melt pump manufactuer
In PET production, the reverse control method is used to control the material feeding speed of the entire system. The slurry feeding amount is actually determined by the output of the melt pump from the final polymerization kettle. Therefore, how to control the speed of the melt pump is particularly important for the material balance and stability of the entire PET production.
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