Melt pump and screen changer for plastic granulation line

In a plastic pelletizing production line, the melt pump and screen changer are two critical auxiliary pieces of equipment, each playing a vital role and jointly ensuring the stable operation of the production line and the quality of the products. Below is a detailed introduction to these two devices:

Melt Pump

Functions:

Stabilizing Melt Pressure: The melt pump, through precise gear transmission, steadily transports high-temperature melt from the extruder to downstream equipment, effectively eliminating melt pressure instability caused by fluctuations in the extruder's pressure, thus ensuring a constant melt pressure.

Increasing Extrusion Output: The melt pump reduces melt backflow caused by pressure build-up in the extruder, thereby increasing extrusion output, typically by around 10%.

Reducing Extruder Load: Since the melt pump takes on the task of establishing melt pressure, the extruder can operate at lower pressures and temperatures, significantly reducing leakage flow and increasing output, which in turn lowers the extruder's load and saves energy and system costs.

Improving Product Quality: The melt pump enhances the plastication effect of the melt, improving the density, smoothness, and dimensional accuracy of the finished products, and reducing the scrap rate.

Structural Features:

The melt pump is primarily composed of a pump housing, driving gear, driven gear, sliding bearings, front and rear end plates, and packing seals. It features a compact structure, reliable operation, low energy consumption, high volumetric efficiency, and minimal shear effect on the melt.

Applications:

The melt pump is widely used in the extrusion molding of plastics, resins, rubbers, and chemical fiber products, such as in pelletizing, film, pipe, sheet, plate, artificial fiber, optical fiber, medical plastic catheter, and other industries.

Screen Changer

Functions:

Filtering Impurities: The primary function of the screen changer is to filter impurities from the melt, ensuring the purity of the melt and thereby improving the quality and performance of the products.

Enhancing Production Efficiency: By enabling quick screen replacement, the screen changer reduces downtime caused by screen blockages, improving the continuous operation capability of the production line.

Types:

There are various types of screen changers, such as manual screen changers, hydraulic quick screen changers, and non-stop screen changers. Among them, non-stop screen changers can replace screens without interrupting production, greatly enhancing production efficiency.

Applications:

The screen changer is also widely used in plastic pelletizing production lines, especially in scenarios where product quality requirements are high. By selecting the appropriate type of screen changer and screen specifications, the needs of different production lines can be met.

Cooperative Use of Melt Pump and Screen Changer

In a plastic pelletizing production line, the melt pump and screen changer are typically used in conjunction. The melt pump is responsible for stabilizing the pressure and flow rate of the melt, ensuring that the melt enters the screen changer at a constant speed and pressure. Meanwhile, the screen changer filters impurities from the melt, guaranteeing its purity. The two work together to ensure the stable operation of the production line and the quality of the products.

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