Polypropylene (FDY, or Fully Drawn Yarn) extrusion melt pump plays a crucial role in the production process of polypropylene fibers. Below is a detailed analysis of the polypropylene FDY extrusion melt pump:

I. Definition and Function

The polypropylene FDY extrusion melt pump is primarily used to uniformly and steadily convey high-temperature molten polypropylene material into the barrel of the extruder, where it performs pressure boosting, stabilization, and metering to ensure the quality and yield of the final product. On the polypropylene fiber production line, the stability and precision of the melt pump directly impact the fiber's tensile properties, diameter uniformity, and overall quality.

Structure: The polypropylene FDY extrusion melt pump typically comprises a pump body, rotor, seals, bearings, and transmission devices. The pump body is internally designed with specific flow channels to accommodate the flow characteristics of polypropylene melt.

Working Principle: The melt pump draws molten polypropylene material into the pump chamber through the rotating rotor, then conveys the material towards the outlet end through the clearance between the stator and rotor. During transportation, the melt pump maintains the material in a molten state through pressure and temperature control, ensuring its uniformity and stability.

III. Performance Parameters

The performance parameters of the polypropylene FDY extrusion melt pump commonly include operating temperature, cleaning temperature, outlet pressure, and viscosity. Taking a certain brand of melt pump as an example, its performance parameters may be as follows:

Operating Temperature: ≤400℃ (750℉)

Cleaning Temperature: ≤450℃ (850℉)

Outlet Pressure: ≤40MPa (6,000psi)

Viscosity: ≤40,000Pa.s

These parameters ensure that the melt pump can operate stably under high-temperature, high-pressure, and high-viscosity conditions.

IV. Application Advantages

Pressure Boosting and Stabilization: The melt pump effectively boosts and stabilizes the pressure of the polypropylene melt, ensuring stable extrusion pressure and thereby improving product dimensional accuracy and surface quality.

Pressure Fluctuation Control: The gear structure within the melt pump acts like a piston, exerting a squeezing effect on the melt to effectively isolate the pressure fluctuations in the feed zone from the discharge zone, stabilizing the pressure fluctuations throughout the extrusion system.

Increased Productivity: Through precise metering and stable conveyance, the melt pump reduces energy consumption and waste during extrusion, enhancing overall production efficiency. Versatility: The polypropylene FDY extrusion melt pump exhibits good adaptability, compatible with various sizes and models of extruders, meeting diverse production requirements.

V. Selection and Installation

When selecting a polypropylene FDY extrusion melt pump, factors such as the specific needs of the production line, the pump's performance parameters, brand reputation, and after-sales service should be considered. During installation, ensure that the pump body is placed on a level ground, maintaining its horizontality and stability, and follow the instructions for proper connection and commissioning.

In conclusion, the polypropylene FDY extrusion melt pump is an indispensable and critical piece of equipment on the polypropylene fiber production line. Through its stable conveying, pressure boosting, and metering functions, it ensures that polypropylene fibers achieve optimal quality and yield.

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