Application scope of melt pump for plastic pelletizing production line

Melt pumps for plastic pelletizing production line in a wide range of applications and key, its core function is to transport, pressurization, metering of high-temperature, high-viscosity polymer melt, and by stabilizing the pressure and flow rate, enhance the efficiency and quality of the extrusion, become an indispensable equipment in the pelletizing process.

Core application scenarios

Plastic melt pelletizing process

Homogeneous mixing and stable output: Before pelletizing, the melt pump homogenizes the plastic melt (e.g. PE, PP, PVC, etc.) through the precise meshing of gears or screws, eliminates feeding errors and process fluctuations (e.g. temperature fluctuations, screw speed pulsations), ensures a stable flow rate of the melt, and thus produces plastic pellets with uniform particle size and consistent composition.

High-pressure conveying and metering: The pelletizing process requires the melt to be conveyed to the pelletizer head. Melt pumps can provide outlet pressures up to 40 MPa, and through the volumetric principle of operation (e.g., positive displacement conveying structure), precise metering of the flow rate (flow rate ranging from 0.1 CC to 30,000 CC/revolution) is achieved, which meets the needs of different formulations and production capacities.

Used in tandem with an extruder

Improve mixing quality and output: Combining an isotropic twin-screw extruder with a melt pump to form a mixing, extrusion and pelletizing line improves mixing quality and output significantly compared to using a twin-screw unit alone. For example, energy consumption per kilogram of material processed can be reduced by about 25%, while the melt retention time in the screw barrel is reduced, stabilizing the plasticization process and lowering the melt temperature, thus improving pellet quality.

Simplify the process: in the single-screw or twin-screw pelletizing extruder with melt pumps and pipe / plate / film extrusion head, can eliminate the pelletizing process directly extruded products (such as wood-plastic profiles, pipes, etc.), shorten the production cycle and energy saving.

Multi-layer co-extrusion and composite pelletizing

In the process of multi-layer co-extrusion or composite extrusion, the melt pump can accurately control the flow rate of the melt in each layer to ensure the stability of the ratio of thickness between the layers, which is suitable for the production of high-precision composite pellets (e.g., co-mixed modified materials, functional masterbatch, etc.).

Selection and Configuration Suggestions

Matching of flow rate and rotational speed: Select the melt pump with suitable flow rate range (e.g. 0.1CC/rpm to 30,000CC/rpm) according to the production line capacity demand, and make sure that the working speed (10-100 rpm) matches with the extruder to realize the best synergistic effect.

Material and sealing form: For corrosive or high temperature melts, choose corrosion-resistant materials (e.g. high temperature alloy steel) and special sealing forms (e.g. screw seal, packing seal or mechanical seal) to ensure long-term stable operation of the equipment.

Heating and control system: electric heating or thermal medium heating system is adopted to precisely control the temperature of the melt; with pressure and temperature sensors and frequency conversion speed control device, the whole process of online monitoring and feedback control can be realized.

Melt pump plays the dual roles of “stabilizer” and “efficiency enhancer” in plastic pelletizing production line, and its application scope covers the whole process from melt homogenization, high-pressure conveying, precise metering to multi-layer co-extrusion, which significantly improves the pelletizing efficiency, product quality and equipment life. The application scope covers the whole process from melt homogenization, high-pressure conveying, precise metering to multi-layer co-extrusion, which significantly improves pelletizing efficiency, product quality and equipment life. For modern plastics processing enterprises pursuing high precision, high productivity and low energy consumption, melt pumps have become indispensable core equipment.

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