Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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A Study on Mixing Characteristics of Two-component Polyurethane for In-mold Coating

인몰드 코팅을 위한 이액형 폴리우레탄의 혼합특성에 관한 해석적 연구

  • Lee, Ho Sang (Department of Aeronautical & Mechanical Design Engineering, Korea National Univ. of Transportation) ;
  • Kim, Dong Mi (Department of Aeronautical & Mechanical Design Engineering, Korea National Univ. of Transportation)
  • 이호상 (한국교통대학교 항공기계설계학과) ;
  • 김동미 (한국교통대학교 항공기계설계학과)
  • Received : 2012.11.08
  • Accepted : 2012.12.04
  • Published : 2013.03.01
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Abstract

In-mold coating is a reactive fluid designed to improve the surface quality of injection molded thermoplastic substrate in functional and cosmetic properties. In this study, a mixing head for in-mold coating was designed, and mixing characteristics of two-component polyurethane flowing through runner were investigated based on flow simulations. In order to achieve uniform mixing of two components injected through straight mixing head, an impingement aftermixer was used in runner design. Semi-circular cross-section was better than circular one for runners for uniform mixing. With increasing runner length and flow rate, mixing became more uniform. In addition, the degree of mixing was more improved with decreasing viscosity of isocyanate.

Keywords

References

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Cited by

  1. Influences of Polyurethane Nozzle Shape on Mixing Efficiency vol.33, pp.1, 2016, https://doi.org/10.7736/KSPE.2016.33.1.31