Plastic Melt Pump for Wire and Cable Extrusion

The plastic melt pump for wire and cable extrusion plays a crucial role in the production process of wire and cable. Here is a detailed introduction to this equipment:

I. Structural Composition

The plastic melt pump for wire and cable extrusion mainly consists of a pump casing, a driving gear, a driven gear, sliding bearings, front and rear end plates, gland seals, and other components. These components work together to ensure that the melt pump operates stably and efficiently.

II. Working Principle

The working principle of the plastic melt pump for wire and cable extrusion relies on the change in working volume caused by the meshing of the driving and driven gears to convey the melt. When the gears rotate in the specified direction, the melt enters the tooth spaces of the two gears in the feed zone. As the gears rotate, the melt is carried into the conveying zone and ultimately extruded into the discharge zone, where it is pressed and conveyed to the outlet pipe. This positive displacement conveying method ensures continuous and stable melt conveying.

III. Functional Characteristics

Precise Metering and Conveying: The output flow rate of the melt pump has a strict positive correlation with its rotational speed, enabling near-linear output. This allows for precise control of the thickness of the cable insulation or sheath, ensuring stability and consistency in product quality.

Significant Pressure Stabilization: The melt pump effectively isolates pressure fluctuations and flow pulsations upstream of the extruder, providing stable melt pressure to the cable extrusion die, ensuring smooth extrusion.

Strong Pressure-Building Capability: The melt pump can generate high pressure, meeting the requirements for melt pressure during cable extrusion, ensuring that the melt can smoothly pass through the die and be extruded into shape.

Increased Production Efficiency: The melt pump reduces the pressure requirements on the extruder screw, enabling the screw to extrude material at high speed and efficiency under lower pressure, thereby increasing the extruder's production capacity and output.

Improved Melt Quality: During conveying, the melt pump shears and mixes the melt through the rotation and meshing of the gears, making the melt more uniform, which is conducive to improving the physical properties and appearance quality of the cable.

Reduced Waste Rate: Stable pressure and precise metering control reduce the production of waste and defective products due to unstable extrusion, improving product qualification rates.

Reduced Extruder Load: The melt pump bears part of the pressure-boosting task originally undertaken by the extruder, reducing the extruder's workload, energy consumption, and wear.

IV. Application Scope

The plastic melt pump for wire and cable extrusion is widely used in the production of various wire and cable products, especially those requiring high-precision, high-quality insulation and sheaths. Additionally, it can convey various high-temperature, high-viscosity polymer melts, such as polyethylene, polyvinyl chloride, rubber, and other commonly used cable insulation and sheath materials.

V. Precautions

When using the plastic melt pump for wire and cable extrusion, it is necessary to monitor it to a certain extent, including outlet pressure, suction pressure, inlet and outlet pressure difference, motor current, gear shaft sealing, and pump temperature. Regular maintenance and servicing of the melt pump should be conducted to ensure its normal operation and extend its service life.

In summary, the plastic melt pump for wire and cable extrusion is an indispensable piece of equipment in the production process of wire and cable. Its characteristics of precise metering, stable conveying, and efficient pressure building ensure high-quality and efficient production of cable products.

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