| Summary: | 碩士 === 國立虎尾科技大學 === 創意工程與精密科技研究所 === 98 === Plastic extrusion is the most common technology in plastic industry. To obtain the optimum parameters, we need lots of experiments and experiences to get the value; however, doing experiments take lots of time and even if they ere done, there is theoretical basis to analyze them. Hereby, the purpose of this study is to find out the optimum parameters by using Taguchi Method.
We found out the factors affecting the quality of PS extrusion by using Taguchi Method. The major factors to affecting PS extrusion process are as below:(A)Proportion of plastic material, (B)Cooling head temperature, (C)Cooling can temperature, (D)Die Zone 1 temperature, (E)Die Zone 2 temperature, (F)Gas pump RPM, (G)Primary screw RPM, (H)Pull Roll line speed (Experiment: A in 2 level, B~H in 3 level),This experiment using Taguchi L18 orthogonal array, the analysis of samples S/N ratio and variance obtain the optimum parameter for extrusion. The shrinkage improvement is as following:
1.The improvement of volumetric shrinkage could effectively evaluate the defects on the product.
2.Appropriately adjust the control factors could improve the volumetric shrinkage problems.
3.By means of Taguchi method analyzes the best combination of parameter could get the best volumetric shrinkage ratio.
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