Abstract: A fractional factorial experiment was employed to screen out significantly independent and interactive factors among numerous processing parameters that are closely related to injection molding cooling system. And, regarding the interaction effect, the cycling time and cavity temperature difference at the end of cooling were taken as the optimization objectives to evaluate their contributions using Taguchi experiment design method as well as with fuzzy comprehensive judgment method. Through an analysis of the evaluation, the influence of various process parameters was clarified, and an optimum combination of processing parameters was thus determined.

Key words: Cooling system, Fractional Factorial, Taguchi experiment design, comprehensive evaluation.