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Thursday, 01 October 2020
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Raw materials & technologies, Technologies

A process model for slot coating of narrow stripes

Monday, 30 December 2019

In a new study, scientists develop a process model for slot coating of variable-width narrow stripes, as a fundamental and representative pattern feature for patterned slot coating.

Selective deposition of patterned films, without masks or subtractive postprocessing steps, can potentially be achieved by extending the capabilities of traditional slot coating. Source: Kaz / Pixabay.
Selective deposition of patterned films, without masks or subtractive postprocessing steps, can potentially be achieved by extending the capabiliti...

The process model addresses the sensitivity of stripe output to fluid deposition rate, substrate speed, and coating gap for a given coating material. To explain the observed process behaviour, they distinguish between separate configurations of contact line pinning of the liquid bridge at the coating tool surface and show experimentally how these configurations relate to regimes in the process model that must be characterised separately.

A model for patterned slot coating

They also demonstrate how the geometry of the liquid bridge and range of intermediate contact angles along its contact line correspond to observed hysteresis of the coated stripe width.

The study is published in: Journal of Coatings Technology and Research  November 2019, Volume 16, Issue 6, pp 1653–1661.

Image source: Pixabay

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