标题：Finite element simulation of PET film extrusion and analysis of choked flow
作者：Qin, Shengxue ;Yang, Qian ;Xu, Xingming
作者机构：[Qin, Shengxue ;Yang, Qian ;Xu, Xingming ] College of Mechanical and Electrical Engineering, Shandong University of Science and Technology, Qingdao 26 更多
来源：Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering
摘要：A coathanger type extrusion runner of polyethylene terephthalate (PET) film with thickness 0.12 mm was designed. The polymer flow was simulated through finite element software, and the distribution of pressure, velocity and temperature field were obtained. The influence of polymer flow on the choked flow design was analyzed. The results show that the runner structure influences the pressure distribution significantly, influenles the distribution of speed and temperature slightly. If the size of choked flow structure of the runner is changed slightly, the pressure of the melt flow within the range of the runner will be changed markedly. So the size change of choked flow structure easily causes the process of extrusion instable, and significantly affects the product quality. Furthermore, the influence of melt flow rate on pressure distribution is insignificant.