I. the definition and core functions of the melt pump

Melt Pump (Melt Pump) is the key power equipment in chemical extrusion production, dedicated to high temperature (≤ 400 ℃), high viscosity (≤ 40,000Pa - s) polymer melt conveying, pressurization and metering. Its core functions include:

Stabilizing pressure and flow

Through the principle of positive displacement conveying, it eliminates the pressure pulsation caused by fluctuation of feeding and temperature change of the extruder, and ensures that the melt flow is strictly proportional to the pump speed, so as to realize the minimization of dimensional tolerance of the extruded products (e.g., the thickness deviation of the pipe and plate is reduced by more than 50%).

Pressure boosting and stabilizing

Outlet pressure up to 0-40MPa, inlet pressure adapted to vacuum suction up to 30MPa, to meet the needs of high resistance molds or long process extrusion.

HOMOLIZATION OF MELT

The shear force generated by gear rotation improves melt homogeneity, reduces unmelted particles or gel spots, and enhances product surface quality.

Reduce Extruder Load

Transferring the extruder's depressurization function to the melt pump allows the screw to work at low pressure and low temperature (≤350°C), reducing leakage and extending equipment life.

II. Typical application scenarios in chemical industry

Plastic processing

Pelletizing: connected in series with twin-screw extruder to improve mixing quality and reduce energy consumption by 25%.

Film/pipe: through the melt pump pressure stabilization, to achieve high-speed extrusion (such as PE film line speed increased by 30%) and uniform thickness.

Wood-plastic composites: with a special twin-screw extruder, the production of skirting, door sets and other profiles, to solve the problem of poor melt fluidity caused by wood powder filling.

Chemical Fiber & Rubber

Man-made Fiber / Optical Fiber: Precise control of melt flow ensures consistent fiber diameter.

Rubber sealing strip: stabilizing pressure by melt pump, reducing air bubbles on the surface of the product and improving the qualification rate.

Medical plastic catheter

High-precision gear pumps (e.g. ZB-B series) can realize the melt flow pulsation rate <1% and meet the catheter wall thickness tolerance ±0.01mm requirement.

Chemical extruder melt pump is the core equipment to improve product quality and reduce energy consumption. When selecting the model, it is necessary to combine the process requirements (temperature, pressure, viscosity) with the production scale, and give priority to the model with optimized flow channel design and low pulsation rate (such as the ZB-B series), and strictly follow the operating rules to extend the life of the equipment.

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