Slot die stripe coating of low viscous fluids

Slot die coating is applied to deposit thin and homogenous films in roll-to-roll and sheet-to-sheet applications. The critical step in operation is to choose suitable process parameters within the process window. In this work, we investigate an upper limit for stripe coatings. This maximum film thic...

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Bibliographic Details
Published in:JCT research 2018-09, Vol.15 (5), p.899-911
Main Authors: Raupp, Sebastian M., Schmitt, Marcel, Walz, Anna-Lena, Diehm, Ralf, Hummel, Helga, Scharfer, Philip, Schabel, Wilhelm
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Coatings
Corrosion and Coatings
Film thickness
Industrial Chemistry/Chemical Engineering
Materials Science
Polymer Sciences
Process parameters
Slot dies
Surfaces and Interfaces
Thick films
Thin Films
Tribology
Viscous fluids
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Summary:Slot die coating is applied to deposit thin and homogenous films in roll-to-roll and sheet-to-sheet applications. The critical step in operation is to choose suitable process parameters within the process window. In this work, we investigate an upper limit for stripe coatings. This maximum film thickness is characterized by stripe merging which needs to be avoided in a stable process. It is shown that the upper limit reduces the process window for stripe coatings to a major extent. As a result, stripe coatings at large coating gaps and low viscosities are only possible for relatively thick films. Explaining the upper limit, a theory of balancing the side pressure in the gap region in the cross-web direction has been developed.
ISSN:1547-0091
1935-3804
2168-8028
DOI:10.1007/s11998-017-0039-y