Design & Manufacturing

Korean Society of Die & Mold Engineering (한국금형공학회)
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Analysis of defects caused by halo defects during injection molding

사출성형 중 달무리 현상에 의한 불량에 대한 분석

  • Lee, Soon-Young (Department of Product Design and Manufacturing Engineering, Graduate School, SeoulTech) ;
  • Park, Eun-Min (Department of Product Design and Manufacturing Engineering, Graduate School, SeoulTech) ;
  • Kim, Do-Hun (Department of Mechanical System Design Engineering, SeoulTech) ;
  • Kim, Yong-Chul (Department of Mechanical System Design Engineering, SeoulTech) ;
  • Yang, Chul-Seung (Department of Mechanical System Design Engineering, SeoulTech) ;
  • Jin, Gyeong-Min (Department of Mechanical System Design Engineering, SeoulTech) ;
  • Kim, Sun-Kyoung (Department of Mechanical System Design Engineering, SeoulTech)
  • 이순영 (서울과학기술대학교 대학원 기계디자인금형공학과) ;
  • 박은민 (서울과학기술대학교 대학원 기계디자인금형공학과) ;
  • 김도훈 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 김용철 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 양철승 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 진경민 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 김선경 (서울과학기술대학교 기계시스템디자인공학과)
  • Received : 2019.09.17
  • Accepted : 2019.12.31
  • Published : 2019.12.31
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Abstract

In this study, we investigated the halo surface defection of various phenomenon occurred during the injection molding process which is caused by the thinning of the product thickness and the importance of the appearance. Surface analysis was performed to observe the difference between the surface where defects appeared and the surface which did not appear. Based on these results, we analyzed the phenomenon of halo surface defects was caused by unstable flow of resin generated in injection molding and velocity change of flow front. Furthermore, we will conduct a clear analysis of halo surface defects through observations through optical microscopy and subsequent observations with atomic force microscope. It has been analyzed that halo in PP is due to the rheological difference between the crystalline and amorphous regions while that in PC/ABS is due to shear separation of PC and ABS.

Keywords

References

  1. Anne M. Grillet, Arjen C. B. Bogaerds, and Gerrit W. M. Peters, and Frank P. T. Baaijens, "Numerical analysis of flow mark surface defects in injection molding flow", J. Rheol., 46, p. 651, 2002. https://doi.org/10.1122/1.1459419
  2. Brent A. Salamon, Kurt A. Koppi, and Jack Little Dow Plastics, "Halo surface defects on injection molded parts", Antec p. 98, 1998.
  3. Hirano, K., Suetsugu, Y., and Kanai, T., "Morphological analysis of the tiger stripe on injection moulding of polypropylene design", J. Appl. Polym. Sci., 104, p. 192, 2007. https://doi.org/10.1002/app.25393
  4. Hobbs, S.Y, "Development of flow instabilities during the injection moulding of multicomponent resins", Polym. Eng. Sci., 36, p. 1489, 1996. https://doi.org/10.1002/pen.10543
  5. Tredoux, L., Satoh, I. and Kurosaki, Y., "Investigation of wave-like flow marks in injection moulding : flow visualization and microgeometry", Polym. Eng. Sci., 39, p. 2233, 1999. https://doi.org/10.1002/pen.11611
  6. Yokoi, H., Deguchi, Y., Sakamoto, L., and Murata, Y., Antec 94, pp. 829-832, 1994.