ANALISA VARIASI UKURAN RUNNER SYSTEM DAN MELT TEMPERATURE TERHADAP FILL TIME, CONFIDENCE OF FILL DAN QUALITY PREDICTION
DOI:
https://doi.org/10.26740/otopro.v20n2.p51-55Keywords:
Fill time, Injection molding, Melt temperature, Runner systemAbstract
The technology used in making plastic products is injection molding technology. In general, the products obtained are not
of good quality, so simulations need to be carried out to determine the correct production process parameters. This research focuses
on determining the effect of variations in runner system size and variations in melt temperature on the optimal fill time, confidence of
fill, and quality prediction for tensile test specimen products. This research uses a simulation approach with the help of software. The
simulation method is used to determine the characteristics of each variation in runner size and melt temperature. The type of runner
layout used is a grid layout type, the runner system type is H balance, and the cross-section type is circle-shaped. Variations in runner
size use runner diameters of 2 mm, 3 mm, and 4 mm. Variations in melt temperature use values of 190°C, 200°C, and 210°C. The
simulations carried out include fill time analysis, confidence of fill analysis, and quality prediction analysis. Simulation results of fill
time, confidence of fill and quality prediction at a runner diameter of 2 mm and melt temperature of 210°C yielded optimal values of
0.7524 s, 100% and 95.1%, respectively. These conditions ensured that the molten polymer remained in a fully flowable state until
complete cavity filling was achieved, thereby minimizing the risk of defects and enhancing cycle time efficiency. An increase in runner
size results in reduced flow resistance of the molten material, while the melt temperature remains within the process conditions
recommended by the material manufacturer.
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