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Cavity air flow behavior during filling in microinjection molding

Griffiths, C. A., Dimov, Stefan Simeonov and Scholz, Steffen Gerhard 2011. Cavity air flow behavior during filling in microinjection molding. Journal of Manufacturing Science and Engineering 133 (1) , 011006. 10.1115/1.4003339

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Process monitoring of microinjection molding (µ-IM) is of crucial importance in understanding the effects of different parameter settings on the process, especially on its performance and consistency with regard to parts' quality. Quality factors related to mold cavity air evacuation can provide valuable information about the process dynamics and also about the filling of a cavity by a polymer melt. In this paper, a novel experimental setup is proposed to monitor maximum air flow and air flow work as an integral of the air flow over time by employing a microelectromechanical system gas sensor mounted inside the mold. The influence of four µIM parameters, melt temperature, mold temperature, injection speed, and resistance to air evacuation, on two air flow-related output parameters is investigated by carrying out a design of experiment study. The results provide empirical evidences about the effects of process parameters on cavity air evacuation, and the influence of air evacuation on the part flow length.

Item Type: Article
Status: Published
Schools: Engineering
Uncontrolled Keywords: cavitation, design of experiments, gas sensors, injection moulding, microfabrication, microsensors, process monitoring
Additional Information: 10 pages
Publisher: ASME
ISSN: 1087-1357
Last Modified: 05 May 2023 16:05

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