2.5.3. Response Surface Optimization Test and Regression Model Establishment

This study used the response surface analysis method to obtain the optimal parameter combination based on the results of the Plackett–Burman test and the steepest ascent test. The phloem and xylem were both using the central composite design method. Three significant levels (high, medium, and low) were taken from the results of the phloem and xylem climbing tests for the experimental design. The interaction effects of the significant factors on the stacking angle were analyzed.
