Study of process parameters of the atomizer-based spray gun for the application of a temporary matte coating for 3D scanning purposes

• Published in: Materials chemistry and physics 2022-04, Vol.282, p.125950, Article 125950
• Main Authors: Franke, Jakub, Koutecký, Tomáš, Malý, Milan, Kalina, Michal, Koutný, Daniel
• Format: Article
• Language: English
• Subjects: 3D scanning; Atomization; Atomizing; Coatings; Ethanol; Matte coating; Optical properties; Phase Doppler Anemometer; Phase Doppler anemometry; Process parameters; Profilometers; Scanning; Spray guns; Thickness; Titanium dioxide; Velocity measurement
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2022.125950

The aim of this paper is to find the most suitable process parameters of the spray gun for the deposition of matte coating for 3D optical scanning purposes. The membrane atomizer-based spray gun is used as a coating device. A suspension of TiO2 and ethanol is used as a coating material. In this study, the formed spray is analyzed using Phase Doppler Anemometry and the results are compared to the deposited coatings. Applied coatings are further examined using a profilometer and 3D scanner to analyze their thickness and the effect they have on the 3D surface reconstruction. The results of this work show that two spray layers are sufficient to evenly apply a coating with good properties for 3D optical scanning purposes. The coating thickness is below 1 μm, reference area is entirely scanned, and the scanned point cloud has a standard deviation from the reference plane below 1.1 μm. •Vibrating mesh atomizer-based spray gun allows the creation of a homogeneous coating.•The spray axial distance has a major effect on the coating appearance.•Minimal overlap of reflective surface by coating to scan at least some data is 40%.•TiO2 particle size and number of the coating layers define the coating thickness.•Coating with 95% surface overlap with thickness of 740 nm was satisfying.