For the design of the runner system of an injection mold, it is important to initially estimate the pressure loss through the runner system. Furthermore, an evaluation of the filling balance is necessary for multi-cavity molds. Flow analysis in injection molding CAE is a useful tool for this estimation. However, most of flow analysis programs, which have been developed, are not powerful enough for studying the flow behavior of a polymer melt in the runner system because beam elements are used for the modeling of the runner system. We have developed a full 3-D flow analysis program, called Remylop-Flow. Solid elements are available to actually model the runner system. Therefore, it is possible to simulate in detail the flow in the runner system. In this paper, the 3-D program was applied to two analyses of the pressure loss through a bend in a runner and the filling unbalance of a naturally balanced runner system. The analysis results showed enough accuracy of Remylop-Flow program for the flow simulation of the runner system.
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