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Numerical Study of Secondary Coating Die Geometry Effects on High Speed Optical Glass Fiber Coating Process  

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)
Publication Information
Journal of the Semiconductor & Display Technology / v.18, no.3, 2019 , pp. 12-18 More about this Journal
Abstract
The protective double layer polymer coatings on silica optical fibers are realized by wet-on-wet liquid coating process and they play an important role in final quality of mass produced optical fibers. This numerical study aims to analyze the effects of secondary coating die design parameters by employing two dimensional axisymmetric model of coating cup and coating die geometry and computational fluid dynamics simulations which include temperature dependent viscosity of polymer coating liquids and viscous dissipation heating. Under high speed fiber drawing conditions and pressurized coating liquid supply, the effects of converging die angle are investigated in order to appreciate the change of coating liquid flow patterns such as flow recirculation zone near coating die as well as primary and secondary coating layer thicknesses. The auxiliary coating die to converging coating die is also tested and the results find that this concept is advantageous in achieving stable double layer coatings on silica glass fiber.
Keywords
Optical Fiber; Glass Fiber Coating; Liquid Coating; Coating Die; Computational Simulation;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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