Analysis of the flow field in a meshing and co-rotating differential twin screw extruder for extruding polylactic acid
Objective:To explore the differences in runner performance of screw groups with different differential ratios,and to clarify the effects of differential speed on the extrusion performance of polylactic acid materials.Methods:Four groups of differential twin screw groups were established by Solidworks software,meshing and finite element numerical simulation were carried out by Fluent software,the calculation results were analyzed by CFD-post software,and the contours and discounted plots of various characterization parameters were combined,and they were verified by experiments.Results:Under the condition that the inlet and outlet pressures were 0.2 MPa and 0.5 MPa,and the reference speed of a single head was 30 r/min,the screws with a differential ratio of 1∶2 and 1∶3 had their own advantages and disadvantages under different properties,and the screws with a difference ratio of 1∶2 for output and pressure in the barrel had an advantage.In terms of mixing capacity,a screw with a differential ratio of 1∶3 had an advantage.Conclusion:Compared with the traditional twin-screw extruder,the differential twin-screw extruder has a positive impact on the extrusion performance of polylactic acid materials,and can be used as a new polylactic acid production equipment.
PLAtwin-screw extrudersdifferential speedco-contract meshingfinite element numerical simulationflowchannel
万方数据
维普
