An injection molding process capability comparison between position and hydraulic transfer modes across various degrees of check ring wear

摘要

The purpose of this study was to determine whether using the traditional position transfer mode or the hydraulic pressure transfer mode produces parts with less variation under the conditions of successively greater check ring wear. The process capability characteristics that were used were the standard deviations of the part weights, part diameters, cushion values and pressure at transfer values for each of the various molding conditions. The hypothesis of the study was that a process set-up in a three-stage hydraulic transfer mode will be more resistant to process variations caused by molding with a worn check ring and therefore more capable than a three-stage position transfer mode process.