Dissertation > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > General issues > Machinery and equipment

Study on Melt Transport Balance Problem of Different Assembled Screw in Extrusion Granulator

Author HeMing
Tutor LuoBing
School Beijing University of Chemical Technology
Course Mechanical Design and Theory
Keywords Intermeshing twin screw Extrusion granulator Screw combination Melt Conveying Numerical Simulation Screw correction
CLC TQ320.5
Type Master's thesis
Year 2010
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Intermeshing co-rotating twin-screw extruders in plastics processing and modification has been more widely used, and has become an important core of plastic extrusion granulation equipment. Driven by market demand, meshing with twin-screw extrusion granulator to the development of high-yield, high-efficiency, large-scale and low-energy direction. Pair of meshing twin-screw extruder extrusion process theory research continues to deepen, but there are still many issues that need further research. On the basis of the theory of the twin-screw extrusion process to carry out the research has a very important significance to improve the design and application of extrusion granulator level engagement with the combination of the twin-screw extruder screw design theory and design methods. The study of this topic is for intermeshing co-rotating twin-screw melt extrusion granulation machine conveyor segment, the combination of the thread of the screw element correction, the melt conveying balance and melt full length of the theoretical and experimental studies. In this study, the use of three-dimensional modeling technology, Detailed threaded components used correction method, and the calculation procedure of the preparation of the different methods of correction. The study showed that: based on the law of the base lead to the correction method of the correction method and the groove surface to obtain a uniform engagement clearance, to ensure a smooth transition between the elements of the combination of elements of different lead thread. In this study, meshing twin-screw extrusion granulation machine screw combination designed to target commonly used screw element runner through numerical simulation geometrically similar and dissimilar commonly used screw element runner, melt conveying quantitative models. Axial pressure distribution, melt conveying quantitative model to calculate the flow channel of the screw combination speculated screw combination of the flow channel in the stable melt extrusion full length. Melt full length to optimize screw combination, in order to improve the production efficiency of the extruder, and provide a reference for intermeshing co-rotating twin-screw extrusion granulation machine screw design. Screw combination of numerical and experimental study of the flow channel: quantitative model to calculate melt conveying screw combination runner melt the full length of the simulation results are consistent with the experimental results of the error of 2.5%. Twin-screw extruder given the granulator extruder throughput and process conditions, the use of the melt conveying quantitative models can be calculated Melt Conveying Section screw parameters, provide the basis for the design of the screw combination.

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