Korea-Australia Rheology Journal

The Korean Society of Rheology (한국유변학회)
권호 표지

Investigation of pressure-volume-temperature relationship by ultrasonic technique and its application for the quality prediction of injection molded parts

  • Kim Jung Gon (Hyosung Corporation, R&D Center for Chemical Technology, Bottle Process Team) ;
  • Kim Hyungsu (Applied Rheology Center, Department of Chemical Engineering, Dankook University) ;
  • Kim Han Soo (Applied Rheology Center, Department of Chemical and Biomolecular Engineering, Sogang University) ;
  • Lee Jae Wook (Applied Rheology Center, Department of Chemical and Biomolecular Engineering, Sogang University)
  • Published : 2004.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, an ultrasonic technique was employed to obtain pressure-volume-temperature (PVT) rela­tionship of polymer melt by measuring ultrasonic velocities under various temperatures and pressures. The proposed technique was applied to on-line monitoring of injection molding process as an attempt to predict quality of molded parts. From the comparison based on Tait equation, it was confirmed that the PVT behav­ior of a polymer is well described by the variation of ultrasonic velocities measured within the polymer medium. In addition, the changes in part weight and moduli were successfully predicted by combining the data collected from ultrasonic technique and artificial neural network algorithm. The results found from this study suggest that the proposed technique can be effectively utilized to monitor the evolution of solid­ification within the mold by measuring ultrasonic responses of various polymers during injection molding process. Such data are expected to provide a critical basis for the accurate prediction of final performance of molded parts.

Keywords

References

  1. Fujiyama, M., T. Wakino and Y. Kawasaki, 1988, Structure of skin layer in injection-molded polypropylene, J. App!. Polym. Sci. 35, 29-49 https://doi.org/10.1002/app.1988.070350104
  2. Hirschfelder, J.O., C.F. Curtiss and R.B. Bird, 1954, Molecular theory of gases and liquids, Wiley, New York
  3. Hobbs, S.Y. and C.F. Pratt, 1975, The effect of skin-core mor-phology on the impact fracture of poly(butylene terephthalate), J. Apply. Polym. Sci. 19, 1701-1722 https://doi.org/10.1002/app.1975.070190621
  4. Hsiung, C.M., M. Cakmak and J.L.White, 1990, Crystallization phenomena in the injection molding of poly ether ether ketone and its influence on mechanical properties, Polym. Eng. ScL 30, 967-980 https://doi.org/10.1002/pen.760301606
  5. Kim, J.G., I.H. Shin, W.H. Han and J.W. Lee, 2000, Injection molded part quality prediction using a new method of analysis, J. Injection Molding Tech. 4, 201-210
  6. Kim, J.G., 2000, Ph.D. Thesis, Sogang University, Korea
  7. Leung, W.P., F.C. Chen, C.L. Choy, A. Richardson and I.M. Ward, 1984, Ultrasonic measurements of the mechanical relax-ations and complex stiffness in oriented linear polyethylene, Polymer 25, 447-451 https://doi.org/10.1016/0032-3861(84)90200-3
  8. McSkimin, H.J., 1964, Physical acoustics, principles and methods, Mason, W.P., ed., Vol. 1, Chap 4, Academic Press, New York
  9. Moseley, W.W., 1960, The measurement of molecular orientation in fibers by acoustic methods, J. Appl. Polym. Sci. 3, 266-276
  10. Tan, V. and M.R. Kamal, 1978, Morphological zones and ori-entation in injection-molded polyethylene, J. Apply. Polym. Sci. 22, 2341-2355 https://doi.org/10.1002/app.1978.070220824