不同螺杆接触状态下异向双螺杆挤出机的流道分布规律

Study on flow channel distribution of different twin screw extruder under different screw contact state

目的:探索聚乳酸在异向双螺杆挤出机不同螺杆接触状态下的流道分布规律。方法:用Solidworks软件建立啮合螺杆、部分啮合螺杆和非啮合螺杆3种几何模型;运用POLYFLOW流体仿真软件进行数值模拟;对3种螺杆不同接触状态下聚乳酸流体的压力场、剪切速率场与黏度场进行对比研究。结果:部分啮合状态下的异向双螺杆挤出机对聚乳酸有较好的建压能力与分散混合能力。结论:聚乳酸在部分啮合状态下的挤出效果优于其他2种螺杆接触状态。

Objective:In order to explore the distribution law of the flow channel of polylactic acid in different screw contact states of the counter-rotating twin-screw extruder.Methods:Partially meshing screw and non-meshing screw were established by Solidworks software.Numerical sim-ulation was carried out using POLYFLOW fluid simulation software.The pressure field,shear rate field and viscosity field of polylactic acid fluid under different contact states of three screws were compared.Results:The counter-rotating twin-screw extruder in the partially meshed state has better pressure-building ability and dispersing and mixing ability for polylactic acid.Conclusion:The extrusion effect of polylactic acid in the partially meshed state is better than the other two screw contact states.