COMPUTER-BASED SIMULATION OF THE FLOW BEHAVIOR OF CORE MELT IN SANDWICH INJECTION

摘要

The sandwich injection molding technique can be used in wide ranges of engineering applications. On the chance of understanding the melt flow behavior and the mechanism of sandwich injection molding, we made dynamic simulation researches on sandwich injection molding process by employing the software of Moldflow Plastics Insight. In this study, the flow behavior of the core melt in sandwich injection molding was investigated by changing the viscosities of melts and process parameters.We find that the viscosity ratio of core to skin melt should be varying in an appropriate range or else a breakthrough phenomenon would occur unavoidably. Furthermore, the flow rate of the melts will greatly influence the flow behavior of the core melt among the process parameters, while the influences from mold temperature and melt temperature are comparatively inapparent.