In the PP modification and granulation production line, the installation of melt pumps and screen changers is of paramount necessity, which is primarily manifested in the following aspects:
I. Necessity of Melt Pumps
Reduced Unit Energy Consumption:
The combined use of melt pumps and granulation extruders significantly reduces unit energy consumption. Compared to using granulation extruders alone, this combination mode can lower energy consumption per kilogram of material by approximately a quarter, facilitating green production.
Extended Equipment Lifespan:
The introduction of melt pumps effectively alleviates pressure stress within the screw barrel, reduces friction and wear between the screw and barrel, and also lightens the load on the thrust bearings of the gearbox. This contributes to extending the overall lifespan of the extruder, ensuring efficient and stable operation over a longer period.
Improved Extrusion Output and Quality:
Melt pumps directly pressurize the die head, unleashing the potential of the screw to operate at higher speeds. Additionally, they flexibly adjust pressure, shortening the residence time of the melt within the screw barrel, stabilizing the plasticizing process, and lowering melting temperatures, thereby enhancing product output and quality.
Stable Output Pressure:
Melt pumps effectively mitigate material output instability and pressure pulsations caused by fluctuations in extruder parameters, ensuring a smooth and reliable production process.
II. Necessity of Screen Changers
Enhanced Product Quality:
Screen changers filter impurities from the melt, ensuring product purity and quality. During PP modification and granulation, various impurities and foreign objects like paper scraps, aluminum foil, gravel, etc., present in raw materials can directly impact product quality and performance if not filtered out.
Ensured Production Continuity:
Modern screen changers, such as double-column hydraulic screen changers, enable on-the-fly screen changes, eliminating production interruptions and material pressure fluctuations caused by traditional stop-and-change methods. This maintains production continuity and stability, boosting efficiency.
Reduced Production Costs:
By minimizing waste and defective products, screen changers help lower production costs. Furthermore, on-the-fly screen changes reduce energy consumption and labor costs associated with downtime.
Expanded Production Capacity:
When using recycled materials and scraps for production, screen changers enable capacity expansion, cost reduction, and enhanced economic benefits.
In conclusion, installing melt pumps and screen changers in PP modification and granulation production lines is crucial for enhancing production efficiency, reducing energy consumption, extending equipment lifespan, improving product quality, and ensuring production continuity. The integration of these devices will further elevate the overall performance and competitiveness of the production line.
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