Visualization Analysis of Cavity Filling Behaviors in Extra Thick-wall Injection Molding

Abstract

It has been reported that the in-mold filling behavior of injection-molded products up to 18 mm in thickness is not affected by gravity. In this study, the thickness of the molded product was increased to 30 mm, the mold temperature was increased to 90°C, and the visualization analysis of the effect of gravity was performed when the gate position was changed upward, downward, and laterally. When the thickness of the molded product was 25mm or more, the sagging phenomenon occurred at the upper gate, and the slanting filling at the front became apparent at the side gate. It was clarified that the initial filling was stabilized at the lower and side gates, while the upper gate was unstable in the high temperature mold.