Working Temperature and Pressure of Polymer Melt Gear Pumps
The operating temperature of polymer melt gear pumps typically reaches up to 300°C, satisfying the requirements for most plastic melt transportation applications. Some high-temperature-resistant models can operate at temperatures up to 500°C. Melt gear pumps are primarily used for the transfer, pressurization, and metering of high-temperature, high-viscosity polymer melts, with widespread applications in the extrusion molding of plastics, resins, rubber, and chemical fiber products.
The working pressure of melt gear pumps is generally expressed by three parameters: inlet pressure, outlet pressure, and differential pressure. For standard pumps, the inlet pressure is below 10 MPa, the outlet pressure is below 35 MPa, and the differential pressure reaches 25 MPa. For high-pressure-resistant models, the outlet pressure can reach 50 MPa.
The inlet pressure of melt gear pumps does not need to be excessively high, with 3-5 MPa typically sufficient. Higher inlet pressures are required for high-viscosity fluids. In some cases, to enhance mixing of the melt within the extruder screw, higher pressure at the screw head may be needed to increase backflow, which can be adjusted by raising the inlet pressure. The inlet pressure is regulated through upstream equipment (e.g., extruders). The outlet pressure depends on factors such as die shape, melt viscosity, and flow rate.
When selecting the operating temperature and pressure of melt gear pumps, users should prioritize meeting application requirements rather than unnecessarily choosing overly high specifications. While melt gear pumps can function under high temperature and pressure conditions, this relies on specialized materials, structures, and corresponding power systems. Pumps with higher temperature and pressure resistance ratings incur higher costs.
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