What is the function of the plastic film extrusion melt pump?

Plastic film extrusion melt pumps play a pivotal role in the extrusion process of plastic films, and their functions are primarily manifested in the following aspects:

1.Pressure Stabilization and Boosting: The melt pump increases and stabilizes the pressure of the high-temperature plastic melt coming from the extruder, ensuring a steady flow into the extruder head. By adjusting the pump's rotational speed with a stable extruder or screw speed, it can achieve variable inlet pressure and steadily increasing outlet pressure, thereby meeting the melt pressure requirements of the extrusion process.

2.Enhanced Product Quality: During the melt transfer process, the internal shearing and mixing actions of the melt pump contribute to homogenizing the melt, improving its uniformity and stability. Furthermore, the stable output of the melt pump minimizes dimensional tolerances in extruded products, reducing scrap and waste rates, thereby significantly enhancing product quality.

3.Increased Extrusion Output: The use of a melt pump reduces the pressure demand on the screw, enabling it to extrude the melt at higher speeds and efficiencies. Additionally, the pump can regulate the backpressure in the extruder, shortening the melt residence time in the barrel, stabilizing the plasticization process, and lowering the melting temperature, ultimately boosting both product output and quality.

4.Reduced Unit Energy Consumption: By enhancing mixing quality and output, the melt pump lowers the energy consumption per kilogram of processed material. Data suggests that combining a melt pump with an extruder can significantly decrease energy consumption compared to using an extruder alone.

5.Extended Equipment Lifespan: The melt pump helps prolong equipment life by reducing wear and overuse of the extruder. Furthermore, stable output pressure and flow rates minimize operational fluctuations and impacts, further protecting the equipment.

6.Reduced Pulsation and Temperature Fluctuations: The melt pump minimizes pulsations in melt flow and temperature fluctuations, crucial for maintaining extrusion process stability and enhancing product quality.

7.Increased Control Precision: By adjusting the pump's rotational speed, precise control over melt flow rate and pressure is achieved, enabling near-linear flow output and enhancing the control precision of the extrusion process.

In summary, plastic film extruder melt pumps serve multiple critical functions during the extrusion process, not only improving production efficiency and product quality but also reducing energy consumption and extending equipment lifespan.

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