Practical operations for intermittent dual-layer slot coating processes

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

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


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.

Original languageEnglish
Pages (from-to)181-186
Number of pages6
JournalKorea Australia Rheology Journal
Issue number3
Publication statusPublished - 2022 Aug

Bibliographical note

Funding Information:
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).

Publisher Copyright:
© 2022, Korean Society of Rheology.


  • Dual-layer
  • Edge formation
  • Intermittent coating
  • Liquid transfer
  • Slot coating

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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