The primary scenarios where a melt pump is required in an underwater pelletizing system include processing low-viscosity/high-melting-point engineering plastics, achieving high-precision pellet size control, maintaining stable high-pressure extrusion conditions, and enhancing energy efficiency on production lines.
Core Application Scenario Analysis
Processing Special Engineering Plastics.
When processing low-viscosity or high-melt-temperature engineering resins such as PET, nylon, and polycarbonate, a melt pump can stabilize melt pressure and prevent die hole freezing and blockage caused by process fluctuations. These materials are temperature-sensitive, and during underwater pelletizing, the die head comes into direct contact with cooling water. A melt pump ensures a continuous and stable melt flow, preventing solidification within the holes.
High-precision pellet production requirements.
When finished pellet diameter must be controlled within 0.01-0.20 inches (e.g., 0.8mm PP micro-pellets) with strict tolerances, the melt pump precisely meters melt extrusion volume, reducing size variation to within 0.5%, thereby minimizing the formation of oversized pellets or agglomerates.
High-pressure extrusion conditions.
In large underwater pelletizing systems, the melt pump can increase the extruder outlet pressure to 35-50 MPa, effectively addressing the molding resistance of high-filler materials and preventing uneven die head discharge due to insufficient backpressure.
Production efficiency optimization scenarios
Energy saving and consumption reduction: The melt gear pump can reduce energy consumption by approximately 25%, particularly in the direct molding of blended modified materials (such as TPU/rubber block pelletization), where eliminating the pelletization process can shorten the production cycle by 30%.
Equipment protection: By diverting the extruder load, screw wear is reduced, extending the service life of critical components in the underwater pelletizing system (such as die plate heaters and hydraulic cutting systems).
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