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Abstract
Employing a spiral channel mold and a set of cavity pressure measurement equipments from Kistler, the cavity pressure response and the maximum flow length during dynamic injection molding were studied. The processing conditions include injection velocity, injection pressure, mold temperature, vibration frequency, and vibration amplitude. The result shows that the maximum flow length can be improved by the dynamic injection molding. Especially at the lower injection pressure, the maximum flow length can be improved about 15%. From the curves of cavity pressure, we found that the cavity pressure undulated regularly in the dynamic filling phase, which is conduced by the screw vibration. During dynamic injection molding, the viscosity of the polymer flow reduces, and the capability of mold filling improves.