Melt pump is a high-precision, high-rotation speed, high reliability equipment, widely used in plastics, chemical fiber, rubber and other polymer materials industry. However, in daily use, sometimes encountered thermoplastic melt pump outlet pressure fluctuation problem, which will not only affect the quality and yield of the product, but also increase the energy consumption and maintenance costs of the equipment. In this paper, we will discuss the reasons for the large fluctuations in melt pump outlet pressure, and put forward the corresponding solutions.

thermoplastic melt pump

First, the extrusion melt pump outlet pressure fluctuation causes

1. Mechanical failure

Mechanical failure of the melt pump is one of the common causes of large fluctuations in export pressure. Common mechanical failures include bearing wear, gear damage, pump chamber blockage. These failures can lead to unstable pump speed, which in turn causes outlet pressure fluctuations.

2. Fluid characteristics

The fluids conveyed by melt pumps are mostly polymer melts with high viscosity, high temperature and high pressure. Fluid viscosity, temperature, pressure and other characteristics will directly affect the pump outlet pressure. When the viscosity of the fluid decreases or the temperature increases, the outlet pressure may increase; when the viscosity of the fluid increases or the temperature decreases, the outlet pressure may decrease.

3. Control system failure

The control system of the melt pump is an important part to ensure its normal operation. If the control system fails, such as sensor failure, solenoid valve stall, etc., it will lead to the pump's outlet pressure fluctuations.

4. Piping system failure

The piping system of the melt pump includes import and export piping, valves, filters and other components. If the piping system is clogged, leaking, vibration and other problems, it will lead to the pump's outlet pressure fluctuations.

extrusion melt pump

Second, the solution

1. Mechanical failure solutions

For outlet pressure fluctuation caused by mechanical failure, the following measures can be taken:

(1) Regularly check the wear and tear of key parts such as bearings and gears, and replace damaged parts in time;

(2) Clean the inside of the pump chamber regularly to prevent clogging;

(3) Adjust the installation position of the pump to ensure that it is in a horizontal state to reduce the impact of vibration on the pump.

2. Fluid characteristics of the solution

For outlet pressure fluctuations caused by fluid characteristics, the following measures can be taken:

(1) Add a heater or cooler at the inlet of the pump to control the fluid temperature;

(2) Add a diluent to the pump inlet to reduce the viscosity of the fluid;

(3) Select a pump model suitable for specific fluid characteristics.

3. Control system failure solutions

For outlet pressure fluctuations caused by control system failure, the following measures can be taken:

(1) Regularly check the sensitivity and accuracy of the sensors and replace damaged sensors in time;

(2) Check the working status of the solenoid valve and clean the stuck spool;

(3) Add filters or voltage regulators to the control system to reduce the effect of electrical noise on the control signal.

4. piping system failure solutions

For the outlet pressure fluctuation caused by piping system failure, the following measures can be taken:

(1) Check the sealing and integrity of the piping system and replace damaged pipes or valves in time;

(2) Add buffers or shock absorbers to the piping system to reduce the impact of vibration on the piping;

(3) Clean the filter regularly to prevent clogging.

melt pump in extruder

Third, the conclusion

The causes of large fluctuations in melt pump in extruder outlet pressure are manifold, including mechanical failure, fluid properties, control system failure and piping system failure. In order to solve this problem, it is necessary to take appropriate measures for different reasons, such as regular inspection and maintenance of mechanical components, control of fluid properties, inspection and maintenance of control systems and piping systems. Through the implementation of these measures, the problem of large fluctuations in melt pump outlet pressure can be effectively reduced, and production efficiency and product quality can be improved.

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