Plastic extrusion how to improve the dimensional accuracy

There is greater volatility in the extruder outlet pressure by a variety of factors will affect the dimensional accuracy of products, if we install a melt pump between exports and die of the extruder can be used to stabilize the extruder outlet pressure fluctuations, the linear extrusion possible to improve the output of the extruder, thereby improving the dimensional accuracy of plastic products, in unit time. The Haike melt pump is a positive displacement conveyor equipment, high-precision gear clearance and volume structure design, stable balanced extrusion made possible, in the chemical fiber granulator, plastic film, sheet, plate, extrusions, tubes The production line, wire and cable, wire drawing, composite extrusion, has been widely used to obtain fairly good results:http://www.prmindustry.com/
Abstract...Articles section To achieve stable extrusion to improve the extrusion products, dimensional accuracy, and reduce scrap. During the extrusion process, uneven material feeding quantity, the fluctuations of the barrel and die temperature, screw speed, the pulse phenomenon is difficult to avoid. Melt gear pump to eliminate the feeding of the feeding system error can be substantially reduced fluctuations in the upstream process passed quickly into the stable state, and improve the extrusion products, dimensional accuracy, and reduce scrap.

    Increase production, reduce energy consumption, low-temperature extrusion, extend the life of the machine. Since the installation of a polymer melt pump to the extruder, extruder decompression functions transferred to the gear pump extruder in the low-pressure low-temperature state, the leakage flow is greatly reduced, production increased. The gear pump is easier than the extruder the establishment of head pressure and reduce the back pressure of the extruder screw to withstand the axial force decline and prolong life.

    With linear extrusion characteristics, easy on the downstream equipment co-ordination. As the gear pump leakage less traffic, the transmission capacity and speed of the pump is basically a linear relationship between the gear pump speed changes, and its flow can know exactly, can determine the downstream device synchronization with the gear pump speed gear pump inlet pressure, temperature and other information collected by the exit of the entire extrusion process full-line monitoring and feedback control.

    Control system adopts Siemens PLC programmable control mode, equipped with advanced man-machine interface, on pressure, temperature, flow, speed of a full range of control, worry-free switching of the automatic and manual control functions, the control system to the elimination of kinds of factors that cause pressure fluctuations of the extruder, the stable spout pressure to maximize the melt pump in the precision extrusion of advantages.

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 Peter  Huang