四螺杆挤出机螺杆排列方式对聚乳酸流场特性的影响

目的：探究聚乳酸在四螺杆挤出机不同螺杆排列方式下的流道分布规律。方法：运用三维建模软件Solidworks分别建立一字型螺杆排列方式、四方型螺杆排列方式和环绕型螺杆排列方式下的螺杆模型与对应的流体区域模型,通过仿真软件Polyflow进行数值模拟。结果：一字型与环绕型的螺杆排列方式与四方型排列相比有更好的建压能力与分布混合能力,四方型排列对聚乳酸的输送能力较弱。结论：一字型螺杆排列方式的四螺杆挤出机对加工聚乳酸有较好的效果。

Effects of screw arrangement in four screw extruder impact on characteristics of polylactic acid flow field

Objective: The flow channel distribution of polylactic acid in four screw extruder with different screw arrangement was studied. Methods: The three-dimensional modeling software Solidworks was used to establish the screw model and the corresponding fluid region model under the arrangement of one-word screw, four-square screw and encircle screw. Numerical simulation was carried out by the simulation software Polyflow. Results: The screw arrangement of monotype and surround type had better pressure building ability and distribution mixing ability than the square arrangement, and the square arrangement had weaker transport ability of polylactic acid. Conclusion: The four-screw extruder with one-line screw arrangement has a good effect on the processing of PLA.