Abstract: The computational fluid dynamics software Polyflow was used to simulate the inflation process of extrusion blow molding under nonisothermal condition. The influence of inflation pressure was analyzed. It showed that the lower crystallinity degree resulted from higher cooling rate. The contact time increased with increasing inflation pressure. The weld seam weakness was more serious with a higher inflation pressure. Considering the comprehensive effect of the efficiency and weld seam weakness, the appropriate inflation pressure was around 0.6 MPa.

Key words: simulation, non-isothermal process, inflation pressure, extrusion blow molding