Abstract
We have proposed a new method of calculating the crystallization process of flowing resin. A program for simulating the crystallization during the filling stage of injection molding process was developed, and applied to the molding process of polypropylene in a simple planar mold. For the case of short filling time (10s), only the resin near the surface of the mold started to crystallize during the filling stage, while for the case of long filling time (30s), crystallization started during the filling stage at all depths in the mold. For both cases, the crystallinity was highest at the melt front and lowest at the gate throughout the filling stage. For short filling time, the crystallization progressed in the packing-cooling stage, and the relative crystallinity reached 100% at the end of the cooling stage. For long filling time, however, the crystallization almost stopped during the packing-cooling stage due to high remaining pressure (about 60MPa), and the relative crystallinity did not reach 100%.
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