Abstract: The die channel was simulated using Polyflow software in order to find a way to produce films with different breadth using a same die through inner-die insertion. The effect of core angle on the residence time was investigated. It showed that the flow was most resided at the end of the channel; the longest residence time was mostly affected by the smallest angle of the channel. When the angle of the core angle was 40°, the least residence time of the flow was observed

Key words: residence time, Polyflow software, core, coat-hanger die, finite element analysis software