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Scaling Behavior of Pattern Formation in the Flexographic Ink Splitting Process

Brumm, Pauline ; Sauer, Hans Martin ; Dörsam, Edgar (2019)
Scaling Behavior of Pattern Formation in the Flexographic Ink Splitting Process.
In: Colloids and Interfaces, 3 (1)
doi: 10.3390/colloids3010037
Article, Bibliographie

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Abstract

We considered pattern formation, i.e. viscous fingering, in the ink splitting process between an elastic flexographic printing plate and the substrate. We observed an unexpected scaling behavior of the emerging pattern length scale (i.e., finger width) as a function of printing velocity, fluid viscosity, surface tension, and plate elasticity coefficients. Scaling exponents depended on the ratio of the capillary number of the fluid flow, and the elastocapillary number defined by plate elasticity and surface tension. The exponents significantly differed from rigid printing plates, which depend on the capillary number only. A dynamic model is proposed to predict the scaling exponents. The results indicate that flexo printing corresponded to a self-regulating dynamical equilibrium of viscous, capillary, and elastic forces. We argue that these forces stabilize the process conditions in a flexo printing unit over a wide range of printing velocities, ink viscosities, and mechanical process settings.

Item Type: Article
Erschienen: 2019
Creators: Brumm, Pauline ; Sauer, Hans Martin ; Dörsam, Edgar
Type of entry: Bibliographie
Title: Scaling Behavior of Pattern Formation in the Flexographic Ink Splitting Process
Language: English
Date: 2019
Place of Publication: Basel
Publisher: MDPI
Journal or Publication Title: Colloids and Interfaces
Volume of the journal: 3
Issue Number: 1
Collation: 16 Seiten
DOI: 10.3390/colloids3010037
URL / URN: https://www.mdpi.com/2504-5377/3/1/37
Corresponding Links:
Abstract:

We considered pattern formation, i.e. viscous fingering, in the ink splitting process between an elastic flexographic printing plate and the substrate. We observed an unexpected scaling behavior of the emerging pattern length scale (i.e., finger width) as a function of printing velocity, fluid viscosity, surface tension, and plate elasticity coefficients. Scaling exponents depended on the ratio of the capillary number of the fluid flow, and the elastocapillary number defined by plate elasticity and surface tension. The exponents significantly differed from rigid printing plates, which depend on the capillary number only. A dynamic model is proposed to predict the scaling exponents. The results indicate that flexo printing corresponded to a self-regulating dynamical equilibrium of viscous, capillary, and elastic forces. We argue that these forces stabilize the process conditions in a flexo printing unit over a wide range of printing velocities, ink viscosities, and mechanical process settings.

Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute of Printing Science and Technology (IDD)
DFG-Collaborative Research Centres (incl. Transregio)
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes > Research Area C: New and Improved Applications
DFG-Collaborative Research Centres (incl. Transregio) > Collaborative Research Centres > CRC 1194: Interaction between Transport and Wetting Processes > Research Area C: New and Improved Applications > C01: Forced Wetting with Hydrodynamic Assist on Gravure Print Cylinders
Profile Areas
Profile Areas > Thermo-Fluids & Interfaces
Date Deposited: 18 Mar 2019 18:26
Last Modified: 04 Dec 2023 12:32
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