Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Improving the Whitening Phenomenon Technology for Preform PET Injection Molding by Using a Ceramic Insulation Gate

세라믹 단열 게이트를 이용한 블로우성형용 PET 프리폼의 백화현상 저감 기술

  • Kwak, Tae-Soo (Department of Mechanical Engineering, Gyeongnam National University of Science and Technology) ;
  • Hwang, Deok-Sang (Department of Mechanical Engineering, Gyeongnam National University of Science and Technology) ;
  • Kang, Byung-Ook (Department of Mechanical Engineering, Gyeongnam National University of Science and Technology) ;
  • Kim, Tae-Kyu (Department of Mechanical Engineering, Gyeongnam National University of Science and Technology)
  • 곽태수 (경남과학기술대학교 기계공학과) ;
  • 황덕상 (경남과학기술대학교 기계공학과) ;
  • 강병욱 (경남과학기술대학교 기계공학과) ;
  • 김태규 (경남과학기술대학교 기계공학과)
  • Received : 2017.09.26
  • Accepted : 2017.12.06
  • Published : 2017.12.31
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Abstract

The purpose of this study is to improve the whitening phenomenon around the PET preform gate for blow molding. CAE analysis of plastic injection molding has been applied to design of preform shape and select the injection molding conditions. A ceramic insulation gate with lower thermal conductivity than metal is applied to improve the whitening phenomenon created around the gate in the injection molding process. According to the results of CAE analysis, the warpage deformation at the square corner was estimated to be about 0.34 mm at the bottom. From the results of the temperature history analysis, it was confirmed that the resin near the gate cooled more rapidly than the cavity. Ceramic insulated gates were fabricated to reduce the cooling rate and experiments were conducted to confirm the effectiveness of the whitening phenomenon improvement. As a result of the ceramic insulation gate experiment, it was confirmed that the whitening phenomenon was significantly reduced around the gate.

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References

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