Mechanisms and benefits of upgrading technologies in finishing / Loyd J. Burcham in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 6 (06/2005)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. C, N° 6 (06/2005) . - p. 209-216 Titre : Mechanisms and benefits of upgrading technologies in finishing Type de document : texte imprimé Auteurs : Loyd J. Burcham, Auteur ; Diamano Cracco, Auteur Année de publication : 2005 Article en page(s) : p. 209-216 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Upgrading of leather crusts that have been damaged by hide defects such as tick bites, scars, and other imperfections remains a high priority in leather finishing because it enables manufacturers to improve the overall quality of their finished leather. The present study uses surface mapping techniques to characterize samples of upgraded full-grain leathers prepared by reverse roll-coating (RRC) and hand stucco application methods. Specific techniques used for surface characterization included Impulse Thermography for surface thermal properties, FTIR mapping for surface chemical properties, dynamic contact angle mapping for surface tension, and scanning-electron and optical microscopy for surface morphology. It was found that the RRC method results in an upgraded crust surface that exhibits very uniform surface properties across the entire surface and in both defect and non-defect areas. By contrast, hand stucco results in a non-uniform crust surface with extremely discontinuous surface properties between defect and non-defect areas. Moreover, adjustments in the RRC add-on coat weight allow for selective and exclusive defect filling while maintaining constant surface physical and chemical properties outside of defect areas through the presence of a thin binder film across the entire surface. Therefore, while the mechanism of upgrading in hand stucco is simply the filling of defects, the mechanism of RRC upgrading comprises the filling of defects plus homogenization of surface physical and chemical properties. These uniform surface properties created by RRC upgrading provide a unique benefit by "priming" the surface for efficient and uniform application of subsequent basecoats and topcoats. En ligne : https://drive.google.com/file/d/1FSLaE4BG3xcWOJ4gexwhapuJGJoVDPRJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4059 [article]

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