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Practical operations for intermittent dual-layer slot coating processes

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Abstract

Transient behaviors of dual-layered patches for Newtonian liquids were numerically investigated in dual-layer slot coating processes for the first time using step-changed inlet flows. To further tune the leading and trailing edges in a patch cycle, startup and end lag times between the top and bottom layers were proposed, considering the flow state of a bottom-layer liquid in a coating bead region. Carefully chosen lag times significantly reduced the defects in the leading and trailing edges of a dual-layered patch. It was also found that a greater coating layer viscosity results in a greater amount of residue left on the die lips, which affects the next patch cycle.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Ministry of Science and ICT (MSIT) of the Korea government (No. NRF-2016R1A5A1009592 and NRF-2021M3H4A6A01041234) and the Ministry of Trade, Industry & Energy (MOTIE, Korea) under the Industrial Technology Innovation Program (No. 20011712).

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Authors and Affiliations

  1. Department of Chemical and Biological Engineering, Korea University, Seoul, 02841, Republic of Korea

    Jin Seok Park, Sanghun Jee, Byoungjin Chun & Hyun Wook Jung

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  1. Jin Seok Park
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  2. Sanghun Jee
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  3. Byoungjin Chun
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  4. Hyun Wook Jung
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Correspondence to Hyun Wook Jung.

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Park, J.S., Jee, S., Chun, B. et al. Practical operations for intermittent dual-layer slot coating processes. Korea-Aust. Rheol. J. 34, 181–186 (2022). https://doi.org/10.1007/s13367-022-00033-y

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  • DOI: https://doi.org/10.1007/s13367-022-00033-y

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