Design & Manufacturing

Korean Society of Die & Mold Engineering (한국금형공학회)
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A study on simultaneous injection molding and two-color coating for car gas cap cover

자동차 주유구 커버에 대한 사출성형과 2색 코팅 동시 구현에 관한 연구

  • Bae, Hyung-Sup (Dep. of Aeronautical & Mechanical Design Eng., Korea Nat'l Univ. of Transportation) ;
  • Park, Dong-Hyun (Dep. of Aeronautical & Mechanical Design Eng., Korea Nat'l Univ. of Transportation) ;
  • Kim, Boo-Kon (Woosung Precision Co., Ltd.) ;
  • Seo, Chang-Ho (Woosung Precision Co., Ltd.) ;
  • Heo, Won-Geun (Woosung Precision Co., Ltd.) ;
  • Lee, Ho-Sang (Dep. of Aeronautical & Mechanical Design Eng., Korea Nat'l Univ. of Transportation)
  • 배형섭 (한국교통대학교 항공기계설계학과) ;
  • 박동현 (한국교통대학교 항공기계설계학과) ;
  • 김부곤 ((주)우성정공) ;
  • 서창호 ((주)우성정공) ;
  • 허원근 ((주)우성정공) ;
  • 이호상 (한국교통대학교 항공기계설계학과)
  • Received : 2021.03.12
  • Accepted : 2021.03.31
  • Published : 2021.03.31
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Abstract

Mold design for in-mold coating was carried out to achieve simultaneous injection molding and two-color coating for car gas cap cover. The developed mold includes one core and three cavities which are composed of a substrate cavity and two coating cavities. To provide a sealing edge for complete seal during the second coating, the first coated material was used at the boundary between the first coating and the second one, and injection molded substrate was used at the parting line. The materials used were PC/ABS for substrate and 2-component Polyurea for coating. Through experiments, it was found that the suggested sealing edges were effective for complete seal during the second coating. In cavity pressure traces, there were three peaks caused by mold closing, coating-material injection and cleaning-piston advancement inside the mixing head. The cavity pressure increased with decreasing coating thickness.

Keywords

References

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