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Extrusion molding process of plastic melt pump

If we add a melt pump between the outlet of the extruder and the die head, it can be used to stabilize the pressure fluctuation of the extruder outlet and make the linear extrusion possible, thus improving the dimensional precision of the plastic products and increasing the output of the extruder within a unit time. The melt pump is a kind of positive displacement conveying equipment, high precision gear clearance and volumetric structure design, making it possible to stable and balanced extrusion. It has been widely used in chemical fiber, granulating, plastic film, sheet, sheet, profile, pipe, wire and cable, wire drawing, compound extrusion and so on. Effect:

1., it can achieve stable extrusion, improve dimensional accuracy and reduce reject rate. During extrusion, it is difficult to avoid the phenomenon of uneven feeding quantity, fluctuation of cylinder and head temperature and screw speed fluctuation. The use of the melt gear pump can eliminate the feeding error of the feeding system, which can greatly weaken the fluctuation of the upstream process transfer, quickly enter the stable working state, improve the precision of the extrusion product size and reduce the waste product rate.

2., increase production, reduce energy consumption, achieve low temperature extrusion and prolong machine life. As the polymer melt pump is installed in the extruder, the pressure reducing function of the extruder is transferred to the gear pump. The extruder can work at low pressure and low temperature, and the leakage flow is greatly reduced and the output is increased. The gear pump is more effective than the extruder to establish the head pressure and reduce the back pressure of the extruder, so that the axial force of the screw decreases and the service life is prolonged.

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