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.
| Original language | English |
|---|---|
| Pages (from-to) | 181-186 |
| Number of pages | 6 |
| Journal | Korea Australia Rheology Journal |
| Volume | 34 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 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.
Keywords
- Dual-layer
- Edge formation
- Intermittent coating
- Liquid transfer
- Slot coating
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics