Melt gear pump pressure requirements: melt gear pump pressure stabilization depends on the critical inlet pressure; under normal conditions, the gear pump has a good self-priming effect, there is no harsh demand for the inlet pressure. When the melt pump inlet pressure is too low, because the melt does not have enough time to fill the rotating tooth valley, the resulting negative pressure will significantly affect the pump's volumetric efficiency and the effect of pressure stabilization, and produce cavitation phenomenon, increase the wear and tear of the gear pump, reducing the service life of the equipment. Usually in the case of a certain screw speed and pump speed, control the amount of charge to reduce the inlet pressure, within a certain range of the export pressure has little effect. When the inlet pressure is lower than the value shown in the vertical line position (about 41/min) below, the outlet pressure changes significantly, the melt gear pump loses the role of pressure stabilization, the inlet pressure at this time that is the critical inlet pressure of the gear pump. Below this value, should consider changing other process conditions (such as reducing the speed of the pump) to ensure the operation of the pump.
Polymer melt pumps significant pressurization effect: BATTE designed melt pumps can reach 35Mpa or even higher pressure, is a good pressurization equipment; plastic extrusion production system, the extruder metering section of the pressurization function can be transferred to the melt gear pumps to complete, thus making up for the extruder in the high head pressure when working under all kinds of shortcomings (such as load, shear, wear and tear serious, material) Long residence time, relatively low screw speed, etc.). At the same time, the extruder screw design can also focus on melting, plasticizing and high yield; relatively high speed, low temperature extrusion becomes possible.
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