[article]
| Titre : |
A sharper look at gloss |
| Type de document : |
texte imprimé |
| Auteurs : |
K. B. Smith, Auteur |
| Année de publication : |
1997 |
| Article en page(s) : |
p. 573-576 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Tags : |
Peinture 'Propriété optique' Feuil Automobile |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
A crucial factor in assessing the appearance of cars and heavy transport is the gloss of the external finish. Gloss can be used to demonstrate cleanliness of a vehicle, and stylists use gloss to emphasise sleek lines. Gloss is also an indicator of the quality of the surface finish since dry-spray ; orange peel ; oven checking ; poorly dispersed pigments ; flocculated pigments ; micro-bubbles, and exudations can all diminish perceived gloss.
The term gloss describes the perception of the shiny appearance of a surface when light is reflected from that surface. When viewing glossy surfaces it is found that a sudden increase in brightness occurs when tha angle of observation is equal to the angle of observation is equal to the angle of incidence of the illuminating light. The condition is termed specular reflection or mirror image angle.
In the case of dielectric materials such as organic paint films some incident light penetrates the transparent surface and, if reflected fromthe underlying pigmentation, will emerge as scattered light. In other words most reflections off paint surfaces contain a proportion of both specular and diffuse light.
Diminished gloss in paint topcoats arises primarily from imperfections in, and roughness of, the surface. This causes light to be reflected at angles slightly offset from the specular. |
| Note de contenu : |
- DEVELOPMENT OF THE MEASUREMENT OF GLOSS
- DEVELOPMENT OF A LIGHT FLUX DENSITY METER : Peak specular reflectance Rs - Standard specular gloss
- HAZE
- DISTINCTNESS OF IMAGE (DOI) |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17270 |
in SURFACE COATINGS INTERNATIONAL > Vol. 80, N° 12 (12/1997) . - p. 573-576
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