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The Effect of Carbon Ink Rheology on Ink Separation Mechanisms in Screen-Printing
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Christopher Phillips ,
Tim Claypole ,
Eifion Jewell
Coatings, Volume: 10, Issue: 10, Start page: 1008
Swansea University Authors:
Sarah-Jane Potts , Christopher Phillips , Tim Claypole , Eifion Jewell
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DOI (Published version): 10.3390/coatings10101008
Abstract
Screen-printable carbon-based inks are available in a range of carbon morphologies and concentrations, resulting in various rheological profiles. There are challenges in obtaining a good print when high loading and elasticity functional inks are used, with a trade-off often required between function...
| Published in: | Coatings |
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| ISSN: | 2079-6412 |
| Published: |
MDPI AG
2020
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa55510 |
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| Abstract: |
Screen-printable carbon-based inks are available in a range of carbon morphologies and concentrations, resulting in various rheological profiles. There are challenges in obtaining a good print when high loading and elasticity functional inks are used, with a trade-off often required between functionality and printability. There is a limited understanding of how ink rheology influences the ink deposition mechanism during screen-printing, which then affects the print topography and therefore electrical performance. High speed imaging was used with a screen-printing simulation apparatus to investigate the effect of viscosity of a graphite and carbon-black ink at various levels of solvent dilution on the deposition mechanisms occurring during screen-printing. With little dilution, the greater relative volume of carbon in the ink resulted in a greater tendency towards elastic behavior than at higher dilutions. During the screen-printing process this led to the ink splitting into filaments while remaining in contact with both the mesh and substrate simultaneously over a greater horizonal length. The location of separating filaments corresponded with localized film thickness increases in the print, which led to a higher surface roughness (Sz). This method could be used to make appropriate adjustments to ink rheology to overcome print defects related to poor ink separation. |
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| Keywords: |
carbon inks and pastes; screen printing; ink separation |
| College: |
Faculty of Science and Engineering |
| Issue: |
10 |
| Start Page: |
1008 |