Function and Principle of the Metering Pump for a Plastic Wire Drawing Machine

The metering pump for a plastic wire drawing machine is a critical component in the plastic wire drawing production line. Its core function lies in precisely controlling the melt flow rate and maintaining stable pressure, directly influencing the quality of the filaments and production efficiency.

Technical Parameters and Structure

Core Parameters

Flow Rate Range: Adjustable based on filament specifications, such as 0.3-170 L/h (applicable to filaments of different diameters).

Pressure Range: Typically 0-0.7 MPa, with some high-end models reaching up to 1.0 MPa.

Material Selection: The pump body often employs industrial aluminum with anti-corrosion coatings. The chamber and check valve materials are PVC or 316 stainless steel, while the diaphragm is made of polytetrafluoroethylene (PTFE) to accommodate acidic or high-temperature melts.

Structural Features

Plunger-Type Metering Pump: Achieves flow control through the reciprocating motion of a plunger, suitable for high-viscosity media (e.g., molten plastics).

Gear Metering Pump: Utilizes gear meshing principles for more stable flow, ideal for low-viscosity media or scenarios requiring continuous feeding.

Hydraulic Diaphragm Metering Pump: Drives diaphragm movement via a hydraulic system to realize leak-free conveyance, suitable for applications with high hygiene requirements.

Application Advantages

Enhancing Product Quality

Precise flow control and pressure stability reduce filament defects (such as bubbles or broken filaments), improving the yield rate. For example, in the production of high-end synthetic fibers, the uniformity of filament diameter can be controlled within ±1%.

Reducing Production Costs

By minimizing raw material waste and defect rates, overall production costs are lowered. Statistics indicate that raw material utilization can increase by 5%-10% after adopting metering pumps.

Adapting to Diverse Process Requirements

Enables rapid switching between the production of filaments with different specifications without replacing core components, improving equipment utilization. For instance, transitioning from producing coarse-denier fibers (50μm diameter) to fine-denier fibers (10μm diameter) only requires adjusting the pump parameters.

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