| Titre : |
Optical analysis of coatings including diffractive pigments using a high-resolution gonioreflectometer |
| Type de document : |
texte imprimé |
| Auteurs : |
Jiri Filip, Auteur ; Radomir Vavra, Auteur ; Frank J. Maile, Auteur |
| Année de publication : |
2019 |
| Article en page(s) : |
p. 555-572 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Diffraction
Goniométrie
Pigments à effets spéciaux
Revêtements -- Propriétés optiques
Spectroscopie de réflectance
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The aim of this article is to demonstrate a new way of measuring and understanding the appearance of pigment flake orientation and texture in special effect pigments for use in industrial coatings. We have used diffractive pigments and analyzed the relative orientation of the particles in the coating layers by evaluating their behavior in two common industry applications: solventborne and powder coatings. We have measured the interference color by taking readings with a high-resolution gonioreflectometer, in order to test the viability of automatic diffractive pigment evaluation. The results were analyzed using both psychophysical (i.e., human) and computational (i.e., mechanical) methods. Our later psychophysical and computational analysis of the visual differences that diffractive pigments present in both solventborne (1) and powder coating (2) systems for in-plane and out-of-plane geometries revealed that solventborne liquid paint systems better preserve the appearance of original diffraction gratings. This is due to enhanced orientation of the anisotropic pigment particles. The powder coating surfaces investigated, on the other hand, preserved higher intensity and thus visibility in randomly oriented solitary flakes, creating a greater sparkle contrast. We confirmed our findings by capturing and visualizing coating appearance by means of a bidirectional texture function. We then compared the diffractive pigment evaluation results with other state-of-the-art measuring device readings. We believe that our work provides valuable information on flake orientation and also compares pigment performance in a range of industrial coating systems, which may enable industrial companies to improve paint spraying processes. |
| Note de contenu : |
- INTRODUCTION : The use of diffractive pigments in industry - The optical appearance of surfaces including diffractive pigments - Manufacture of diffractive pigments - Coatings systems analyzed for this study and panel preparation
- EXISTING ANALYSIS METHODS FOR EFFECT COATINGS TO DATE : Angular analysis of effect pigments in general - Analysis of coatings containing diffractive pigments - Texture analysis of effect coatings
- MOTIVATION EXPERIMENT ON THE VISUAL APPEARANCE OF DIFFRACTIVE PIGMENTS
- DEVELOOPMENT OF AN AUTOMATIC METHOD OF DIFFRACTIVE PIGMENT : Apearance acquisition system - Geometry decription
- ANALYSIS : Psychophysical analysis - Computational texture data analysis
- EXPERIMENTS ON PIGMENTS OF VARYING CONCENTRATION : Higher pigmentation samples - Lower pigmentation samples
- COMPARISON OF PROPOSED METHOD TO A STATE-OF-THE-ART TEXTURE MEASUREMENT DEVICE
- CAPTURE APPEARANCE ON COATED OBJECTS |
| DOI : |
10.1007/s11998-018-0137-5 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0137-5.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32425 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 2 (03/2019) . - p. 555-572
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Optical analysis of coatings including diffractive pigments using a high-resolution gonioreflectometer in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)
