Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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A Study on Improvement of Flow Characteristics for Thin-Wall Injection Molding by Rapid Mold Heating

급속 금형가열에 의한 박육 사출성형의 유동특성 개선에 관한 연구

  • Park Keun ;
  • Kim Byung H. (Dept. Mechanical & Industrial Engineering, University of Massachusetts Amherst, USA)
  • Published : 2006.02.01
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Abstract

The rapid thermal response (RTR) molding is a novel process developed to raise the temperature of mold surface rapidly to the polymer melt temperature prior to the injection stage and then cool rapidly to the ejection temperature. The resulting filling process is achieved inside a hot mold cavity by prohibiting formation of frozen layer so as to enable thin wall injection molding without filling difficulty. The present work covers flow simulation of thin wall injection molding using the RTR molding process. In order to take into account the effects of thermal boundary conditions of the RTR mold, coupled analysis with transient heat transfer simulation is suggested and compared with conventional isothermal analysis. The proposed coupled simulation approach based on solid elements provides reliable thin wall flow estimation for both the conventional molding and the RTR molding processes.

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References

  1. R. Selden, 2000, Thin wall molding of engineering plastics-a literature survey, J Injection Molding Tech., Vol. 4, pp. 159-166
  2. F. Jim, 1995, Thin wall molding differences in processing over standard injection molding, SPE ANTEC, Vol. 41, pp. 430-433
  3. B. H. Kim, N. P. Suh, 1986, Low thermal inertia molding, Polym. Plast. Technol. Eng., Vol. 25, pp.73-93 https://doi.org/10.1080/03602558608070076
  4. K. M. B. Jansen, A. A. M. Flaman, 1994, Construction of fast-response heating elements for injection molding applications, Polym. Eng. Sci., Vol. 34, pp. 894-897 https://doi.org/10.1002/pen.760341105
  5. D. Yao, B. Kim, 2002, Development of rapid heating and cooling systems for injection molding applications, Polym. Eng. Sci., Vol. 42, pp. 2471-2481 https://doi.org/10.1002/pen.11133
  6. D. Yao, B. Kim, 2002, Increasing flow length in thin wall injection molding using a rapidly heated mold, Polym. Plast. Technol. Eng., Vol. 415, pp. 819-832
  7. R. P. Maloney, A. J. Poslinski, 1998, Viscosity pressure dependence and material degradation effects on thinwall mold filling simulation, SPE ANTEC, Vol. 44, pp. 542-546
  8. M. Mahishi, 1998, Material characterization for thin wall molding simulations, SPE ANTEC, Vol. 44, pp. 547-553
  9. L. Yu, L. J. Lee, K. W. Koelling, 2003, Flow and heat transfer simulation of thin-wall injection molding with microstructures, SPE ANTEC, Vol. 49 pp. 602-606
  10. K. Park, 2004, A study on flow simulation and deformation analysis for injection-molded plastic parts using three-dimensional solid elements, Polym Plast. Technol. Eng., Vol. 43, pp. 1569-1585 https://doi.org/10.1081/PPT-200030276
  11. H. H. Chiang, C. A. Hieber, K. K. Wang, 1991, A Unified Simulation of the Filling and Postfilling Stages in Injection Molding, Part I: Formulation, Polym. Eng. Sci. Vol. 31, pp. 116-124 https://doi.org/10.1002/pen.760310210