Abstract
Gas counter pressure (GCP) technology can increase the pressure of melt before flowing effectively. Therefore, it has a potential to reduce shrinkage ratio and improve dimensional accuracy of conventional injection molding part. The effect of different process parameters on the shrinkage ratio of molded parts was studied by means of S/N ratio and ANOVA. The results showed that GCP pressure was the most important factor affecting the shrinkage ratio of molded parts, followed by packing time, injection pressure, mold temperature, melt temperature and packing pressure. Meanwhile, the most optimal combination of process parameters and 1.27% shrinkage ratio of parts were obtained. Finally, the influence of different process parameters on the shrinkage ratio of molded parts was also analyzed.
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