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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Cleaner chrome tanning - technology of chrome-reduced tanning without salt, pickling and short procedure / Luo Jian-Xun 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. 289-295 Titre : Cleaner chrome tanning - technology of chrome-reduced tanning without salt, pickling and short procedure Type de document : texte imprimé Auteurs : Luo Jian-Xun, Auteur ; Feng Yan-Juan, Auteur Année de publication : 2019 Article en page(s) : p. 289-295 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide polyacrylique Déchets -- Réduction Polycarboxylates Poudres Produits chimiques -- Consommation -- Réduction Tannage au chrome Tannage sans sels Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Tannery effluents with high salinity and containing chromium have a serious environmental impact. The traditional chrome tannage that involved the use of sodium chloride, acid and chromium is one of the main origins of salt and chromium pollution. In this study, a non-pickle, chrome-reduced tanning technology was developed. The novel chrome-free agent SL can be directly employed to tan bated bovine hide producing wet-white. The shaved wet-white was pre-treated by a poly-carboxylate auxiliary agent PAA and tanned by chrome powder. It was found that the shrinkage temperature of the wet-white tanned by SL reached over 80°C, the optimal consumption of poly-carboxylate auxiliary agent was 1.5- 2wt% based on the weight of the shaved wet-white, the better chrome-reduced tanning conditions were that the wet-white was tanned with 3-4wt% chromium powder for 150-180 minutes at room temperature when the initial pH value was 3.0-3.5. The next processes were same as those of a traditional chrome tannage. Meanwhile, the shrinkage temperature of the leather tanned by the chrome-reduced tannage reached more than 95°C, the absorption of chromium was 96%, the content of Cr2O3 in the effluent was under 200mg/L. For the chrome-reduced tanned leather,the absorption of dyestuff and fat-liquor reached 99.5% and 82.5% respectively. Compared with the traditional chrome tanning process, not only was the conventional pickling process eliminated, the process was shortened and reduced the pollution of sodium chloride. The process can reduce by 50% the consumption of chrome powder, improve the absorption of chromium and reduce the content of Cr2O3 in effluent. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Tanning properties of the novel chrome-free agent SL - The properties of wet-white tanned by the novel chrome-free agent SL - Optimisation of the offer of chrome tanning agent in tanning process - The properties of poly-carboxylate auxiliary agent in the low-chrome tannage - Contrast experiment between chrome-reduced tanning and traditional chrome tanning - Pilot production of leather tanned by chrome-reduced tannage - RESULTS AND DISCUSSION : Analysis of tanning properties of the novel chrome-free agent SL and its leather - Optimum initial pH of chrome tanning agent on shaved wet-white - Optimum offer of chrome tanning agent for shaved wet-white - Optimum offer of the poly-carboxylate auxiliary agent PAA in chrome-reduced tanning of shaved wet-white - Comparison of chrome-reduced tannage and traditional chrome tanning - The properties of leather tanned by chrome-reduced tannage from pilot production En ligne : https://drive.google.com/file/d/1_b6GCLclh8aX2f9oJk2AMc-M7-OyAz0H/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33205 [article]

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Engineering the square cow and other things... / Graham Lampard in LEATHER INTERNATIONAL, Vol. 214, N° 4822 (07/2012)  

[article]  inLEATHER INTERNATIONAL > Vol. 214, N° 4822 (07/2012) . - p. 38-40 Titre : Engineering the square cow and other things... Type de document : texte imprimé Auteurs : Graham Lampard, Auteur Année de publication : 2012 Article en page(s) : p. 38-40 Langues : Anglais (eng) Catégories : Cuirs et peaux Tannage sans sels Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The news that the CSIR - CLRI in Chennai have developed a 'salt free tanning technology' which completely eliminates pickling and basification using conventional tanning salts and without use of any new chemicals is encourging. But, G. Lampard suggests, the need for developments has been ongoing since the days of 'a year and a day tanning'. En ligne : https://drive.google.com/file/d/1a4IhWkXMQrbloDBK41bx_WIZGg-gKv65/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15566 [article]

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Expanding the practical approach for salt-free tanning / M. Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 6 (06/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 6 (06/2024) . - p. 279-289 Titre : Expanding the practical approach for salt-free tanning Type de document : texte imprimé Auteurs : M. Sathish, Auteur ; Surojit Manna, Auteur ; Nakkala Gopi Krishna, Auteur Année de publication : 2024 Article en page(s) : p. 279-289 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alumine Carbonate de sodium Le carbonate de sodium est un composé chimique ayant pour formule Na2CO3. Il s'agit d'un sel de sodium de l'acide carbonique. Dans le langage courant, on parle aussi de soude ou de cristaux de soude, à cause de son contenu en sodium et de sa forme habituellement cristalline. Par contre, il ne faut pas confondre le carbonate de sodium avec la soude caustique ou encore avec le bicarbonate de soude. Phénol Syntans Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Tannage minéral Tannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium Tannage sans sels Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Our research group previously established a practical approach for salt-free chromium tanning by changing the order of addition of masking salts (COAMS) for electrolyte-cum-masking effect. The present work deals with the modified COAMS process for developing a salt-chromium-free tanning system using aluminium. The tanning conditions such as Al to masking salt (cirtate) ratio, Al2O3 offer, the effect of phenolic syntan, and its order of addition on tanning performance have been studied in detail. It was found that the addition of 3% sodium carbonate (based on the weight of aluminium sulfate) along with aluminium sulfate reduces the acidity without affecting the tanning performance and leather quality. The ideal conditions for the pickle-free aluminium tanning were found to be 1.5% Al2O3 offer, 5% phenolic syntan offer, and an Al to citrate ratio of 1:0.2. It was also found that the order of addition of phenolic syntan did not affect the tanning performance. Furthermore, in comparison to leather produced without syntan, the combined effect of aluminum and phenolic syntan raises the shrinkage temperature by 6°C (Without syntan: 74°, with syntan80°) and decreases the rate of shrinkage by 74%. However, the addition of phenolic syntan did not improve Al exhaustion and leaching resistance to water. The physical characteristics and fiber compactness have been improved by the addition of phenolic syntan. SEX-EDAX study reveals that the aluminum is uniformly distributed throughout the cross-section. Note de contenu : - MATERIALS AND METHODS : Optimization of aluminium to masking salt ratio - Effect of phenolic syntan on tanning Performance - Changing the order of addition of phenolic syntan on tanning performance - Optimization of Al2O3 offer - Optimized tanning process - Analysis of aluminium leaching - Hydrothermal shrinkage temperature measurements - Physical strength characteristics and SEM analysis - RESULTS AND DISCUSSION : Salt-free aluminium tanning – Process strategy - Optimization study - Leaching study - Rate of hydrothermal shrinkage - Physical strength characteristics - SEM analysis - Table 1 : Process recipe for salt-chromium-free tanning Raw material : Goat delimed pelts, Thickness (Neck) : ~ 1.5 mm - Table 2 : Post-tanning process recipe (Thickness : 1.0 mm) - Table 3 : Optimization of Al2O3 offer - Table 4 : Physical strength characteristics of salt-free aluminium tanned leather with and without syntan treatment DOI : https://doi.org/10.34314/p2bkbr74 En ligne : https://drive.google.com/file/d/1GARAXNsKqoB6V91A0FLew0yaHND2til-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40989 [article]

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A new salt-free approach to tanning in WORLD LEATHER, Vol. 18, N° 7 (11/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 7 (11/2005) . - p. 23 Titre : A new salt-free approach to tanning Type de document : texte imprimé Année de publication : 2005 Article en page(s) : p. 23 Langues : Anglais (eng) Catégories : Polycarbamoyl sulfonates Tannage sans sels Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The following paper provides an overview of a different approach to tanning. The technique is managed in the 'non-swelling' pH zone, and thus eliminates the need for salt within the conventional acid pickle. The fibre stabilisation provided—somewhat similar to a pretannage with glutaraldehyde—allows strong leather characteristics, such as those provided by conventional chrome tannage, to be developed within a main tanning or retanning stage. En ligne : https://drive.google.com/file/d/1AydAqqHdpDC8GItMb04J5q2_oiOfKgCE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32493 [article]

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Salt-free chromium tanning : Practical approaches / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 1 (01/2022)  

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