Analytical determination of process windows for bilayer slot die coating

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• 作者：Marcel Schmitt ; Sebastian Raupp…
• 关键词：Multilayer ; Bilayer slot die coating ; Process window ; Non ; newtonian flow ; Lithium ; ion batteries
• 刊名：Journal of Coatings Technology and Research
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：12
• 期：5
• 页码：877-887
• 全文大小：1,684 KB
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• 作者单位：Marcel Schmitt (1)
  Sebastian Raupp (1)
  Dennis Wagner (1)
  Philip Scharfer (1)
  Wilhelm Schabel (1)
  
  1. Institute of Thermal Process Engineering, Thin Film Technology, Karlsruhe Institute of Technology, Karlsruhe, Germany
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Tribology, Corrosion and Coatings
  Surfaces and Interfaces and Thin Films
  Polymer Sciences
  Materials Science
  
• 出版者：Springer US
• ISSN：1935-3804

文摘

Slot die coating is a film casting process with a highly diverse variety of everyday applications. As a pre-metered process it not only guarantees excellent film uniformity, but is also suitable for simultaneously applied multilayer coatings. Characteristic singularities like the behavior of the liquid–liquid interface and the impact of the additional mid-lip on film uniformity were already investigated before. However, the effect of an altered gap pressure regime on commonly used coating windows has not yet been discussed. In this work, we therefore extended available single-layer coating windows for Newtonian and power-law liquids to the bilayer case. Here, the emphasis was laid on the air entrainment limit. Subsequently, the theoretical results were compared to experimental data. It was found that the onset of air entrainment strongly depends on the top to bottom film thickness ratio for bilayer coatings. A critical film thickness ratio which delivers similar coating limits as those for single-layer coatings was derived and confirmed by experimentally gained results. Keywords Multilayer Bilayer slot die coating Process window Non-newtonian flow Lithium-ion batteries