OPTIMASI DESAIN RUNNER DAN GATE SYSTEM PADA PROSES INJEKSI PLASTIK UNTUK RANGKA KACAMATA SAFETY
Keywords:
Injection molding, Runner, Gate, Safety glasses, MoldflowAbstract
Plastic has become a dominant material in modern manufacturing industries due to its lightweight, low cost, and easy processing. However, around 15% of injection molding products fail because of non-optimal runner and gate design, while in the case of safety glasses frames, the rejection rate reaches 18–20% due to weld lines and air traps. This study aims to optimize the runner and gate system design in plastic injection molding for safety glasses frames using Autodesk Moldflow. Several runner (full round vs trapezoidal) and gate (fan vs edge) configurations were compared to evaluate filling time, injection pressure, weld lines, and air traps. The results show that the full round runner with fan gate configuration achieved the best performance with a filling time of 1.904 s, injection pressure of 75.6 MPa, only 2 weld lines, and 1 air trap. Compared to the worst configuration (trapezoidal–edge gate), this design reduced filling time by 12%, decreased injection pressure by 15%, and minimized weld line and air trap defects by 30–40%. These findings demonstrate that CAE-based simulation is effective in reducing trial-and-error approaches and increasing mold design efficiency.
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Indonesian Society of Applied Science (ISAS)
