Pattern formation in slot-die coating

Author:

Kasischke Maren1ORCID,Hartmann Simon23ORCID,Niermann Kevin1,Smarra Marco1ORCID,Kostyrin Denis1,Thiele Uwe23ORCID,Gurevich Evgeny L.14ORCID

Affiliation:

1. Chair of Applied Laser Technology, Ruhr-Universität Bochum 1 , Universitätsstraße 150, 44801 Bochum, Germany

2. Institut für Theoretische Physik, Westfälische Wilhelms-Universität Münster 2 , Wilhelm-Klemm-Str. 9, 48149 Münster, Germany

3. Center for Nonlinear Science (CeNoS), Westfälische Wilhelms-Universität Münster 3 , Corrensstr. 2, 48149 Münster, Germany

4. Laser Center (LFM), University of Applied Sciences Münster 4 , Stegerwaldstraße 39, 48565 Steinfurt, Germany

Abstract

We experimentally study the occurrence of pattern formation during the slot-die coating of partially wetting liquids onto polyethylenterephthalat-substrates outside the coating window. The experimental investigation is supported by numerical simulations of a dynamical model. Our results demonstrate that beyond a critical coating speed, the deposition of homogeneous coating layers undergoes an instability resulting in the self-organized emergence of patterned coatings, i.e., stripes of different orientation and droplet patterns. We investigate the transitions between the different patterns as triggered by changes in the control parameters inherent to slot-die coating, e.g., the liquid viscosity and the coating gap height. The relatively simple theoretical approach is based on lubrication theory. It is already able to reproduce most of the patterns observed experimentally and reveals a wettability-driven instability mechanism.

Funder

Deutsche Forschungsgemeinschaft

Publisher

AIP Publishing

Subject

Condensed Matter Physics,Fluid Flow and Transfer Processes,Mechanics of Materials,Computational Mechanics,Mechanical Engineering

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Microscopic derivation of the thin film equation using the Mori–Zwanzig formalism;The Journal of Chemical Physics;2024-09-03

2. Paint and Coating Physics;Physics of Fluids;2023-09-01

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