Sequential valve gating for thin wall injection molding comparison between experimental results and filling software

摘要

The objective of this study was to investigate the sequential and concurrent filling patterns of a U-shaped thin walled cavity and to evaluate the weld line location, shifting of weld line location and retention of weld line strength. The experimental results were also compared with the predicted results obtained from a computer filling simulation software. The opening of the gates was sequenced to achieve the desired fill pattern, thereby eliminating hesitation effects which cause the flow front freeze-off and also to control the wall thickness to flow length ratio. The paper discusses the effect of critical processing parameters that affect the shifting of weld line location such as, fill pressure, fill time and gate opening-closing time.