melt pump for polycarbonate

Melt pumps are used to pressurize and stabilize the flow of high temperature plastic melt from the extruder into the extruder head. Its ability to stabilize melt pressure and flow is superior to various types of extruders. Melt pumps are widely used in the extrusion molding of plastics, resins, rubber products, such as pelletizing, film, pipe, plate sheet and other industries.

Advantages of using melt pumps for polymer extrusion:

1. Improved dimensional stability ---- effectively isolate the mold from fluctuations from upstream;

2. Controls melt quality ----- regulates extruder back pressure to reduce retention time, stabilizes plasticizing action, and reduces melting temperature;

3. Increase throughput ----- providing very high efficiency regardless of the amount of pressure required to build up;

4. Reducing raw material use ---- provides a final product with little variation in finished size;

5. Elimination of fluctuations and screw impacts ----- effectively solves problems caused by melt density or extruder parameters;

6. Enhanced extruder flexibility ----- allows for changes in processed parts, e.g., higher return material usage, temperature and pressure.

7. Extended extruder life ----- reduces extruder workload, e.g. pressure and torque;

8. Less running cost ---- provides more accurate delivery metering and avoids raw material waste.

Melt pump is a positive displacement conveying device, the flow rate is strictly proportional to the speed of the pump. It mainly consists of pump casing, active gear, driven gear, slide bearing, front and rear end plates, packing seal and so on. The tooth profile of the two gears, the pump body, the side cover plate constitutes the feeding area, transmission area and discharge area of the pump. When working, it relies on the working volume change caused by the mutual meshing of the master and slave gears to convey the melt.

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