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Advances in Materials Research
  Volume 3, Number 2, July 2014 , pages 091-103

Study molded part quality of plastic injection process by melt viscosity evaluation
Chung-Chih Lin and Chieh-Liang Wu

    A study that demonstrates how to investigate the molded part quality and the consistency of injection process based on the rheological concept is proposed. It is important for plastic material whose melt viscosity is variable with respect to the processing condition. The formulations to couple the melt viscosity with injection pressure and fill time are derived first. Taking calculations of the measured pressure and the time by using these formulations, the melt viscosity in injection process can be determined on machine. As the relation between the injection speed and the melt viscosity is constructed, the influences of the setting parameter of injection machine on the molded part quality can be investigated through evaluating the state of the melt viscosity. In addition, a pressure sensor bushing (PSB) designed with a quick installation feature is also provided and validated. The results show that a higher injection speed improves the tensile strength of the molded part but also the consistency of the molded part quality. This work provides an alternative to evaluate the molding quality scientifically.
Key Words
    rheology; melt viscosity; consistency of molded part quality; injection molding process
Chung-Chih Lin and Chieh-Liang Wu: Department of Mechanical and Computer-Aided Engineering, National Formosa University 63208, No.64, Wen-Hwa Road, Hu-Wei town, Yunlin county, Taiwan

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