The use of melt gear pumps can increase the flexibility of the extrusion system

Melt gear pump is a supporting equipment in the plastic extrusion industry, mainly used in conjunction with extruders to improve their performance. The two main functions of an extruder are heating, melting, and pressure conveying, which are closely combined. Due to the inherent instability of the melting process, the pressure conveying process also exhibits instability, causing the output of the extruder to be in a state of shock and fluctuation. The use of a melt pump is attached to the extruder, with the main purpose of eliminating these impacts and fluctuations. The use of a melt pump solves these problems and increases the flexibility of the extrusion system.

melt gear pumps

1. Pressure conveying mechanism

It is meaningful to compare the pressure conveying mechanism between the extruder and the polymer melt pump. In summary, the extrusion melt pump is an active conveying mechanism that can press polymer melt at a highly stable rate. The extruder generates pressure through viscous resistance.

polymer melt pump

2. Process control

When a melt pump is connected to an extruder, a control system is required to maintain an appropriate balance between the pump speed and screw speed of the melt pump. The simple control measure is to adjust the screw speed so that the inlet pressure of the melt pump remains constant. A more complex measure is to adjust the motor of the extruder and the motor of the pump to achieve a constant extrusion amount, even if the flow resistance increases due to slow and gradual blockage of the filter.

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