抄録
We have developed a simulation method for injection molding which takes account of the dependency of material properties on crystallinity. The crystallinity is calculated during the simulation, and the thermal conductivity and viscosity of the resin are updated at each time step. We also take account of the latent heat of crystallization and pressure dependence of the thermal conductivity. The equation of state obtained during the crystallization simulation under actual cooling rate is used. We have applied this method to the molding of polypropylene in a rectangular mold. The results show that pressure in the mold rapidly decreases during the packing stage, in good agreement with experiment. It is found that taking account of the crystallinity dependence of viscosity and use of correct equation of state are most important in improving the accuracy of the simulation.
