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What are the core functions of a melt pump?

The core functions of a melt pump are mainly embodied in the following aspects:

Precision Melt Delivery: A melt pump is primarily used to convey high-temperature, high-viscosity polymer melts at a stable flow rate. For example, in the production of cast film, the melt pump precisely delivers the melt conveyed from the extruder screw to the die head at a set flow rate, ensuring a stable supply of melt throughout the casting process.

Pressure Establishment and Maintenance: The melt pump can establish a stable pressure within the system, which is crucial for ensuring uniform flow of the melt out of the die slit. It can compensate for fluctuations in the extruder's output pressure, maintaining a relatively stable pressure at the die head, thus ensuring uniform thickness of the cast film.

Melt Quality Improvement: During conveyance, the melt pump also plays a role in mixing and homogenizing the melt. As the melt passes through gears and other components inside the pump body, it undergoes shear and stirring, making the temperature and composition of the melt more uniform, which is conducive to improving product quality.

Stable Extrusion Process: The melt pump has stable extrusion capabilities, effectively eliminating instability factors in the extrusion process caused by uneven material feeding, temperature fluctuations in the barrel and die head, and screw speed variations.

Improved Dimensional Accuracy of Products: The melt pump can significantly improve the dimensional accuracy of extruded products, reducing scrap rates. Its flow accuracy can typically reach within ±1%, ensuring minimal thickness tolerance of the products.

Increased Production and Reduced Energy Consumption: The melt pump transfers the extruder's pressure reduction function to itself, allowing the extruder to operate under lower pressure and temperature conditions, reducing leakage flow and increasing overall production. At the same time, its efficient design reduces the extruder's back pressure when establishing and maintaining die head pressure, thereby reducing the axial force borne by the screw and lowering energy consumption.

Enhanced Equipment Durability: By stabilizing the extrusion process, the melt pump reduces equipment failures and damage caused by extrusion instability, thereby extending the equipment's service life.

Linear Extrusion Characteristics and Online Monitoring: The melt pump has linear extrusion characteristics, facilitating coordination between upstream and downstream equipment. Additionally, by utilizing pressure, temperature, and other information collected at the melt pump's inlet and outlet, the entire extrusion process can be monitored and controlled online in real-time, thereby better achieving automated control and optimization of the production process.

In summary, with its core advantages such as stable extrusion capabilities, efficient production increase, energy consumption reduction, equipment life extension, ease of detection and control, and product quality improvement, the melt pump plays a crucial role in production lines for chemical fibers, pelletizing, plastic films, and other applications.

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