Injection molders presently use the "Apparent Viscosity Curve" to determine the optimum fill time for a particular modl. Once the fill time has been determined, the Viscosity Curve is set aside and the goal of the molder is to maintain the fill time. The motivation for my work is not only to determine fill time, but also to quantify the melt viscosity using an injection molding machine/mold combination. the ability to determine the melt viscosity would assist the molder with "root cause" analysis when evaluating small dimensional shifts. The study will focus on determining if the derived viscosity, using traditional rheological equations, is of value when compared to dimensional or cosmetic changes.
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