Journal of the Semiconductor & Display Technology (반도체디스플레이기술학회지)

The Korean Society Of Semiconductor & Display Technology (한국반도체디스플레이기술학회)
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Analysis of Coating Flow Characteristics in Wet-on-Wet Optical Fiber Liquid Coating Process

광섬유 WOW 액상코팅 공정의 코팅액 유동특성 해석연구

  • Kim, Kyoungjin (Department of Mechanical System Engineering, Kumoh National Institute of Technology) ;
  • Park, Joong-Youn (Department of Mechanical System Engineering, Kumoh National Institute of Technology)
  • 김경진 (금오공과대학교 기계시스템공학과) ;
  • 박중윤 (금오공과대학교 기계시스템공학과)
  • Received : 2017.12.21
  • Accepted : 2017.12.26
  • Published : 2017.12.31
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Abstract

In this computational study of optical fiber manufacturing, WOW (wet-on-wet) double coating process on freshly drawn glass fiber has been numerical modelled and simulated using a simplified geometry of typical optical fiber coating apparatus. The numerical domain includes primary and secondary coating dies along with secondary coating cup and the interface between primary and secondary coating liquids are investigated using level set method. Coating liquid viscosity is an important parameter and its dependence on temperature is also considered. Since there would be possibility for pressure and temperature of primary coating liquid to be increased substantially at high fiber drawing speed, the effects of increased pressure and temperature of primary coating liquid are examined on flow patterns of coating liquids in secondary coating cup. In case that both pressure and temperature of primary coating liquid are high enough, liquid interface becomes noticeably unstable and this flow instability could adversely affect the uniform coatings and final quality of produced optical fiber.

Keywords

References

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