Importance of Controlling Speed of PET Melt Gear Pump

In continuous PET production, it is very important to keep the rotational speed of gear pump stable for the material balance and stability of the whole production. The rotational speed of the melt gear pump can flexibly choose whether to adopt flow control or pressure control according to the control emphasis. Flow control has the advantages of direct control and intuitive flow display, while its disadvantages are that the pressure before pump is not easy to be stabilized due to the increase of granulation and spinning. The advantage of pressure control is that pressure regulation is timely and sensitive, and the pressure of sequential system is stable. The disadvantage of pressure control is that the actual flow rate of melt gear pump is not well matched with the required output. Whether the speed of the melt gear pump is controlled by flow or pressure, the flow rate of the melt gear pump is affected by the volume efficiency of the pump. In actual production, the formula for calculating the volume efficiency of the pump is written into the formula for calculating the flow rate of the melt gear pump, which can keep the display value of the flow rate of the melt gear pump consistent with the actual flow rate value, and better ensure the stable operation of the whole continuous production line.

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