Design of experiments (DOEs) are a valuable tool for optimizing manufacturing processes and ensuring product quality. There are a wide variety of DOEs available, all having their own advantages and disadvantages and unique characteristics. In terms of plastic joining manufacturing processes, hot-plate welding of polypropylene was chosen as a platform for comparing three of the more common DOEs: full-factorial, Box-Behnken, and central composite. A complete analysis of the process was not southt, but within thefield of factors studied, hot-plate welding of polypropylene appears to be a robust process. All three DOEs resulted in slightly different model equations, but very similar response surface contour plots.
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