Flow and film-forming characteristics analysis of non-newtonian fluid slot coating

Wei Chu Shu, Tsai Fang Wu, Ren-Haw Chen, Kuei Yuan Cheng, Chih Wei Hsieh

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The slot coating process in the production of polymer films has a wide range of applications. However, the process cannot be systemized. This study used the computational fluid dynamics software Polyflow to analyze the slot coating process and investigate the influence that the process parameters have on the characteristics of thin-film coating to reduce the time and cost consumed in the experimental methods. The rheological characteristics of the non-Newtonian fluid used in this study were first identified by conducting experiments, and then configured in the simulation software for fitting with mathematical models. In addition, the models of the slot coating process were constructed, and the Arbitrary Lagrangian-Eulerian (ALE) calculation methods were then used in the Polyflow software. The simulation results were then compared to the experimental results and the findings reported in relevant literature, to determine the influence that the process parameters have on the characteristics of thin-film coating. The simulation results were represented graphically in a coating window plot. The comparison results indicate that the viscosity-shear rate characteristic of the material in the shear rate range of optical film coating is an excellent fit for the Cross Law. When the coating speed is too high or the amount of fluid supply is insufficient, phenomena such as break lines, uneven thickness, and air entrainment can occur.

Original languageEnglish
Title of host publicationAdvances in Materials and Processing Technologies XVI
PublisherTrans Tech Publications
Pages539-546
Number of pages8
ISBN (Print)9783038350972
DOIs
StatePublished - 1 Jan 2014
Event16th International Conference on Advanced Materials and Processing Technologies, AMPT 2013 - Taipei, Taiwan
Duration: 22 Sep 201326 Sep 2013

Publication series

NameAdvanced Materials Research
Volume939
ISSN (Print)1022-6680

Conference

Conference16th International Conference on Advanced Materials and Processing Technologies, AMPT 2013
CountryTaiwan
CityTaipei
Period22/09/1326/09/13

Keywords

  • Coating window
  • Computational fluid dynamics
  • Functional film
  • Slot coating

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