The three main functions of metering pumps in plastic filament extrusion lines

The melt metering pump in a wire drawing machine plays a crucial role in the drawing process, mainly encompassing the following three aspects:

Precise Flow Control

The metering pump of a wire drawing machine can control the melt flow with high precision. During the drawing process, the melt needs to pass through the spinneret at a stable and accurate flow rate to ensure that the formed wire has a uniform diameter. By precisely adjusting its output flow rate, the metering pump can adapt to the production needs of different wire specifications. For instance, when producing high-end fibers with fine diameters, the metering pump of a PP wire drawing machine can control the flow rate within an extremely small error range, guaranteeing consistency in wire diameter.

Maintaining Stable Pressure

To ensure the stability of the drawing process, the metering pump provides stable pressure to the melt, allowing it to flow at a uniform speed throughout the drawing system. Stable pressure helps prevent issues such as uneven thickness and breakage of the wire. For example, during high-speed drawing, stable pressure ensures that the wire maintains good morphology during cooling and stretching.

When changes occur in wire drawing process parameters, such as adjustments to spinneret hole diameters and draw ratios, the metering pump can quickly respond and adjust pressure and flow rate to maintain process stability. This enables the wire drawing machine to adapt to different production requirements and product specifications.

Enhancing Product Quality

Ensuring wire uniformity, precise flow control and stable pressure result in more uniform wire diameters and smoother surfaces. This is crucial for producing high-quality fiber products, such as synthetic fibers for high-end textiles, where uniformity directly affects the texture, strength, and appearance of the textiles.

Reducing product defects, the stable operation of the metering pump in the wire drawing machine can reduce the probability of flaws in the wire, such as bubbles and breaks. By ensuring uniform melt flow and pressure stability, it reduces product defects caused by flow instability and improves product yield.

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