Both polypropylene (PP) and polystyrene (PS) parts were molded by injection-compression molding. The Taguchi method was utilized to investigate the effects of six processing parameters, including mold temperature, compression speed, compression time, compression distance, delay time, and compression force, on part shrinkage uniformity. Analyses of means and variance showed that the compression force is the most important parameter for part shrinkage uniformity of both parts. The compression distance is the second most significant parameter on shrinkage uniformity of PS part, but not significant parameter on PP part. The optimal processing parameters for improving the shrinkage uniformity of both parts are found and verified experimentally.
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