Polymer Melt Gear Pump

The polymer melt pump serves as the core unit for pressure stabilization and metering in continuous polymer production lines. Unlike standard transfer pumps, its primary purpose extends beyond mere conveyance; instead, it focuses on ensuring stable flow rates, maintaining constant die pressure, and protecting heat-sensitive melts. By absorbing output fluctuations from extruders or reactors, it delivers a controlled melt supply to downstream processes-such as die forming, coating, and spinning-thereby minimizing defects like uneven thickness, gels, and color variations at the source.

Key Features of polymer melt gear pump

I. Independent Volumetric Metering: Decoupling Flow from Extrusion Fluctuations

Extruder screw discharge inherently involves pulsating flow fluctuations. Melt pumps utilize precise gear meshing to **independently lock the output flow rate**, ensuring that fluctuations in inlet pressure have virtually no impact on discharge volume. This results in significantly tighter thickness tolerances for films, sheets, and fibers, improved product consistency, and reduced scrap rates.

II. Low-Shear Flow Path Design: Protecting Heat-Sensitive Polymers

Featuring a proprietary low-compression gear profile and a flow path free of stagnant zones, the design ensures short melt residence times and minimal shear-induced temperature rise. For easily degradable materials-such as polyimide, PET, PC, and polyurethane prepolymers-this minimizes carbonization, gel formation, and molecular chain scission, thereby preserving the material's original physical and optical properties.

III. Dual Temperature Control Options: Electric Heating or Thermal Oil Jacket

1. Electric Heating Model: Features built-in heating elements and multi-point PT100 temperature sensors with PID closed-loop control. It offers rapid heating response and a streamlined layout without the need for extensive thermal oil piping, making it ideal for pilot-scale testing, coating applications, and intermittent reaction discharge.
2. Thermal Oil Jacket Model: Provides a more uniform temperature distribution. It is suited for long-term, continuous, high-capacity operations, ensuring stable production for materials like high-temperature asphalt and high-viscosity polymers.
The entire series supports a maximum operating temperature of 350°C.

FAQ:

Q1: Can melt pump reduce the load of extruder?

A: Yes. The extruder only melts polymer, while the melt pump takes over pressure build-up. Lower outlet pressure reduces screw load, energy consumption and barrel wear, extending the maintenance cycle of extruder.

Q2: Can displacement (cc/rev) be customized?

A: Yes. Custom displacement from 0.5cc/rev to 200cc/rev is available. Small displacement for lab & pilot lines, large displacement for industrial extrusion and compounding.

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