Imbalances occur in powder injection molding of multi cavity molds, which are sometimes opposite to the shear induced imbalances of conventional plastic materials. In a previous study it was found that melt rotation technology not only reduced imbalances, but also helped reduce differences between the mechanical properties of parts molded in multi-cavity molds. This paper presents the results of a study that expands on a previous work to include effects of fill rate, additional variations in runner geometries, and designs of melt rotation technologies for eliminating the variations.
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