PART OF FOAMING CONTROL AND MECHANICAL PROPERTIES DURING MICROCELLULAR INJECTION MOLDING PROCESS VIA A SYSTEM OF GAS COUNTER PRESSURE AND DYNAMIC MOLD TEMPERATURE VARIATION

摘要

The purpose of this study is to develop a foaming control for Gas Counter Pressure (GCP) combined with mold temperature control technology during the MuCell process and to investigate its influence on mechanical properties. The results show that under GCP control alone, foam qualities and the thickness of frozen layer may be affected. Further, the tensile strength increases, but impact strength falls. The lower the mold temperature control for the frozen layer, the more obvious is the increase in bubble size, while the greater the average bubble size, the lower the tensile strength. Using both GCP and the mold temperature control, when mold temperature was higher while get average bubble size small and uniform, resulting in improved tensile strength.