Practical operations for intermittent dual-layer slot coating processes

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 botto...

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Bibliographic Details
Published in:Korea-Australia rheology journal 2022, 34(3), , pp.181-186
Main Authors: Park, Jin Seok, Jee, Sanghun, Chun, Byoungjin, Jung, Hyun Wook
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Coating
Complex Fluids and Microfluidics
Food Science
Inlet flow
Materials Science
Mechanical Engineering
Newtonian liquids
Polymer Sciences
Short Communication
Soft and Granular Matter
Trailing edges
공학일반
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Summary: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.
ISSN:1226-119X
2093-7660
DOI:10.1007/s13367-022-00033-y