A numerical study on micro leakage behaviors at cavity edge during photo reaction injection molding

광반응사출성형 시 캐비티 엣지에서 발생하는 미세누출현상에 관한 해석적 연구

  • La, Moon-woo (Korea Institute of Industrial Technology, Molds & Dies Group)
  • 라문우 (한국생산기술연구원 금형기술그룹)
  • Received : 2016.08.05
  • Accepted : 2016.09.02
  • Published : 2016.09.05

Abstract

Despite technological advance, there have been several troubles in photo reaction injection molding (photo RIM) to produce ultra thin light guide panels (LGPs). In this study, micro leakage problem at cavity edge during photo RIM was investigated numerically. In order to obtain optimal processing conditions, we regulated inlet pressure of injected resin at the cavity edge and figured out micro leakage behaviors. At low inlet pressure (less than 100 Pa), though the micro leakage problem was not occurred, another problem, short shot due to not enough driving force, was appeared More than 1,000 Pa of the inlet pressure, injected resin was rapidly leaked through the micro gap at the cavity edge. Finally, we obtained optimal inlet pressure around 600 ~ 1,000 Pa. At this region, injected resin fully filled the cavity without micro leakage behavior. Based on the present study, further comparative investigations with experimental photo RIM should be performed to find optimal processing conditions for produce ultra thin LGPs.

Keywords

References

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