Melt Pump: The Game-Changer for Transparent PU Tube Extrusion
Transparent PU (TPU) tubes demand exceptional clarity, uniform wall thickness, and stable mechanical properties, but traditional extrusion lines often struggle with pressure fluctuations, material degradation, and haze issues. A high-performance melt pump emerges as the critical solution to elevate production standards, addressing the unique challenges of transparent TPU processing.
The melt pump is installed between the extruder and the die head, serving as a precision “pressure stabilizer” during the extrusion of transparent polyurethane pipes. It isolates upstream pressure pulsations (reducing fluctuations to ±0.5 MPa) and provides a constant melt flow rate, ensuring wall thickness tolerances are maintained within ±1–2%—a significant improvement over the ±5–8% typical of traditional systems. This stability eliminates surface defects such as screw marks and shrinkage marks, while maintaining a light transmittance of over 90%.
For heat-sensitive transparent TPU, the melt pump’s low-shear design minimizes thermal degradation. By separating plasticization and pressure building, it reduces melt temperature by 10-20℃, preventing yellowing and haze increase caused by overheating . Its mirror-polished flow channels (Ra≤0.2μm) avoid material retention, ensuring ultra-clean processing critical for transparency .
Energy efficiency and productivity are further enhanced: the melt pump cuts extruder motor load by 15-30%, slashes energy consumption, and boosts output by 15-30% . Compatible with high-viscosity TPU (up to 20,000 Pa·s) and strict processing requirements (170-210℃), it’s the ideal upgrade for high-end transparent PU tube production in medical, automotive, and electronics industries.
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