The melt 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.

Precise Flow Rate Control

The metering pump delivers the melt to the spinneret at a stable and precise flow rate through the reciprocating motion of a plunger or gear. For instance, in the production of PP (polypropylene) woven bags, the pump body must control the flow rate error within an extremely narrow range (e.g., ±0.5%) to ensure the uniformity of the filament diameter.

Pressure Stability

By maintaining a stable melt pressure, the metering pump prevents uneven filament thickness or breakage caused by pressure fluctuations. During high-speed wire drawing (e.g., with a linear speed of 300-500m/min), stable pressure ensures that the filaments maintain consistent morphology during the cooling and stretching stages.

Process Adaptability

When process parameters such as spinneret hole diameter and stretching ratio are adjusted, the metering pump can quickly respond and regulate the flow rate and pressure. For example, when producing fine-denier fibers (with a diameter ≤10μm), the flow rate needs to be adjusted to 0.3-3cm³/r to meet high-precision requirements.

Typical Application Cases

PP Woven Bag Wire Drawing: It requires a metering pump that is resistant to high temperatures and wear, with a flow rate range typically between 10-50 L/h.

High-End Fiber Production: For fibers such as polyamide (PA) or polyester (PET), a high-precision metering pump is necessary (with a flow rate error ≤ ±0.1%).

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