Advanced diagnostics and innovative solutions for leather defects : the problem of yellowing / Claudia Florio in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 6 (11-12/2019)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 6 (11-12/2019) . - p. 296-304 Titre : Advanced diagnostics and innovative solutions for leather defects : the problem of yellowing Type de document : texte imprimé Auteurs : Claudia Florio, Auteur ; Roberta Aveta, Auteur ; Gianluigi Calvanese, Auteur ; Biagio Naviglio, Auteur Année de publication : 2019 Article en page(s) : p. 296-304 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux -- Défauts Jaunissement (défaut) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Providing peculiar enhanced features to leather items is a factor of primary importance for the marketing of high-end articles; although tanning production is oriented to satisfy a wide market range, it is mainly in the `high end' and `premium luxury' categories that the quality properties of the material are more expressed, indeed. It is particularly on this market segment that the main current challenges have been focussed, according to the growing requirement of technological innovation, sustainability and product quality. Light-coloured leathers, with particular reference to white items, belong to the category of materials designed especially for the luxury market. For this type of articles, the uniformity of colour and the agreeable appeal of the overall surface appearance are crucial requirements for the most international fashion and luxury brands. One of the most common and undesirable defects of this type of article is the alteration of the colour, with particular reference to the localised or diffused effects of yellowing of the surface of the material. There are several causes able to contribute to the production of this type of defects, due to the complexity of the matrix and to the variability of traditional or innovative production processes used: from the intrinsic fragility, photosensitivity and thermo-sensitivity of the finishing polymers, to the chemical instability of some components of the finishing pigments, further the presence of photosensitive chemical additives, the migration of skin components or assembly components of the manufactured articles (fats, fillers, plasticisers, glues etc.), up to the indirect contribution of environmental and thermo-climatic factors able to affect negatively the performance of the material. SSIP, which has always been involved in research and consulting activities for the leather industry with regards to defect monitoring, through this work, would offer an overview of all the main tools for advanced diagnostics (with particular reference to Scanning Electronic Microscopy and to chromatographic and spectroscopic methods) aimed to the identification of the causes of yellowing, beside to explore innovative solutions for the development of strategies for the resolution and/or minimisation of the problem of yellowing. The technical solutions will include innovative tanning processes, innovative finishing methods, and leather surface treatments carried out in order to provide a sensible attenuation of surface absorption of IR and UV-visible radiation. Note de contenu : - Technical and diagnostic approach - Technical results - Possible technical solutions - Fig. 1 : The different main factors able to promote leather yellowing - Fig. 2 : IR spectra overlap of the topcoat of defective and not defective samples - Fig. 3 : Cross section and surface of a not defective calf leather and cross section and surface of a defective buffalo leather - Fig. 4 : IR Spectrum of the glue found on the sample: spectroscopic profile compatible with a polyacrylate - Fig. 5 : Gas-chromatographic profile of the organic extract of the defective sample (leather for footwear) - Fig. 6 : Overlap of the gas-chromatographic profiles of the organic extract of the defective and not defective parts of the sample (leather for automotive) - Fig. 7 : 2-Octyl-2H-isothiazol-3-one - Table 1 : Gas-chromatographic determination of the volatile substances in the non-defective sample - Table 2 : Gas-chromatographic determination of the volatile substances in the defective sample En ligne : https://drive.google.com/file/d/1nLKxh25oQc7eYZjHyti_fPnv9AefpJdf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33206 [article]

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Biodegradability of "eco-friendly" leather using respirometric approach / Marco Guida in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 9 (09/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 9 (09/2019) . - p. 325-332 Titre : Biodegradability of "eco-friendly" leather using respirometric approach Type de document : texte imprimé Auteurs : Marco Guida, Auteur ; Antonella Giorgio, Auteur ; Roberta Aveta, Auteur ; Maria Scotti, Auteur ; Daniela Caracciolo, Auteur ; Giovanni Libralato, Auteur ; Francesco Aliberti, Auteur ; Salvatore De Bonis, Auteur ; Biagio Naviglio, Auteur Année de publication : 2019 Article en page(s) : p. 325-332 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux -- Biodégradation Respirométrie Sels métalliques Tannage au chrome Tannage sans sels Wet-white (tannage) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Biodegradability is the ability of degradation of organic substances and materials into more simple inorganic substances through enzymatic activity of microorganisms. The measure of the tanning products biodegradability allows to predict the deterioration of the materials and allows to assess their impact on the environment since chromium, derived from tanning industries, could be transformed in the hexavalent stage of chromium (Cr6+) that is a suspected carcinogen. Three leather samples, have been chosen for biodegradability test, in order to evaluate differences in biodegradability and to evaluate the possibility of using alternative leathers of those based on chromium. It was possible to make a comparison between three different leather samples; among these, the highest percentage of biodegradability was found for the metal-free leather sample (84%) compared to 45% and 80% of the chrome leather and wet-white leather samples. Results highlight the possibility of using differently tanned leathers with a considerably reduced environmental impact. Note de contenu : - Materials - Microscoic and physic-chemical analysis - Biodegradability analysis - Table 1 : List of chemical parameters analyzed in leather samples - Table 2 : List of physical parameters analyzed in leather samples - Table 3 : Results of chemical analysis of leathers - Table 4 : Results of physical analysis of leathers En ligne : https://drive.google.com/file/d/1xZjGx_qg9Sj3L9wShUxVz9OG-d_oNoGF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32900 [article]

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