What problems do polymer melt gear pump manufacturers solve for plastic extrusion?
In plastic extrusion production, after raw materials are plasticized by the screw, they go through filtration, conveying and die forming. If the screw speed, raw material viscosity or filter resistance changes, outlet pressure and flow rate may fluctuate. For the production of film, sheets, plates, pipes, profiles, pelletizing and other products, unstable discharging directly affects the subsequent forming quality.
Melt gear pumps boost pressure, stabilize pressure and ensure steady conveying. The melt pump is generally installed between the extruder and die. A pair of rotating gears continuously transports high-temperature polymer melt along the pump cavity from inlet to outlet. Compared with relying solely on the screw to build pressure, the melt pump reduces the impact of upstream extruder fluctuations on the die and delivers more stable downstream pressure and flow.
Displacement is not the only factor for pump selection. Materials such as PET, PP, PE, PC, PA, TPU and EVA have different requirements for temperature, viscosity and pressure. Selection requires confirmation of actual output, operating temperature, inlet pressure, outlet pressure, melt viscosity, installation dimensions and other working conditions.
Tianjin Ruicheng Pump supplies melt gear pumps and complete pump packages tailored to actual working conditions. Packages can include pump head, motor, reducer, coupling, screen changer and electric control system. Our products are used on extrusion lines for film, sheet, plate, pipe, profile, pelletizing and plastic recycling & reprocessing.
