Abstract: In order to explore the effect of injection molding parameters on the glossiness of polypropylene parts, Taguchi method was employed to determine the experiment factors and their weighs. It was found that the increase of melt temperature, mold temperature, dwell pressure, and injection rate could increase the glossiness of the parts; meanwhile the tensile and bending strengths would also increase at the cost of notch impact strength. The descending order in weigh of the influence factors was melt temperature, mold temperature, packing pressure, and injection rate.

Key words: Taguchi method, glossiness, polypropylene, melt temperature, mould temperature, injection molding, part