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.
关键词
聚乳酸/双螺杆挤出机/差速/啮合同向/有限元数值模拟/流道
Key words
PLA/twin-screw extruders/differential speed/co-contract meshing/finite element numerical simulation/flowchannel
维普
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