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Application of gelatin extracted from chrome shavings for the glazed finishing of leather / M. Catalina in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 5 (05/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 5 (05/2010) . - p. 138-144 Titre : Application of gelatin extracted from chrome shavings for the glazed finishing of leather Type de document : texte imprimé Auteurs : M. Catalina, Auteur ; Geoffrey E. Attenburrow, Auteur ; J. Cot, Auteur ; Anthony D. Covington, Auteur ; A. Paula M. Antunes, Auteur Année de publication : 2010 Article en page(s) : p. 138-144 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The objective of this work was to ascertain the performance of extracted gelatin from dechromed leather shavings as a coating in the finishing of leather. Gelatin is a protein-ased material isolated from chrome-tanned collagenic wastes. A comparison between a commercial protein-based product, extracted gelatin and a mixture of extracted gelatin/glycerol was carried out. Based on the results obtained in previous studies, two fixing agents were used to fix the finishing : 5-ethyl-1-aza-3,7-dioxabicyclo[3,3]octane (oxazolidine II) and ethylene glycol diglycidyl ether (EGDE). The mixture gelatin/glycerol (using glycerol as a plasticiser) presented satisfactory results, compared with the commercial product, for the abrasion, gloss and flex resistance, although a poor performance under wet rub fastness (assessment of 1 on the grey scale (ISO 105-A02, A03) and adhesion tests were found due to the hygroscopic nature of glycerol. The formulation for potential further studies was the extracted gelatin fixed with EGDE which showed the best performance on dry rub fastness (4-5 on the grey scale) and finish adhesion, and a good performance on resistance to abrasion and to flex (low loss of finishing and no cracking observed). The results confirmed the optential for gelatin, obtained from chrome shavings, to be used as a leather finishing agent. En ligne : https://drive.google.com/file/d/1BO1nsFXR6X0nyzNYe_RCH-6UdKfUJrBq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9358 [article]

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Studies on the removal of inter-fibrillary materials part I : Removal of protein, proteoglycan, glycosoaminoglycans from conventional beamhouse process / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 5 (05/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 5 (05/2010) . - p. 145-149 Titre : Studies on the removal of inter-fibrillary materials part I : Removal of protein, proteoglycan, glycosoaminoglycans from conventional beamhouse process Type de document : texte imprimé Auteurs : Balaraman Madhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2010 Article en page(s) : p. 145-149 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The removal of the inter-fibrillar materials viz., proteins, proteoglycans and glycosoaminoglycans (GAGs) are the integral part of conventional liming and bating processes. However, precise quantification on the removal of these interfibrillar materials is still lacking. Hence, in the present work quantification on the removal of protein, proteoglycans and glycosaminoglycans (from goat skins) during liming and bating was attempted. An understanding of the removal of these inter-fibrillar materials precisely could help in developing objective process control measures. Alternative techniques can be developed as it is known that conventional liming processes contribute to more than 60 % of the total pollutionload. The quantification of proteins, proteoglycans and glycoaminoglycans was standardized to suit the requirement for the estimation of the samples obtained from beamhouse process liquors (from liming to bating). It is observed that 3,2 % proteins, 1,2 % proteoglycans and 0,04 % GAGs are released (based on wet salted weight) in the pretanning processes, from liming to bating. removal of proteoglycans during liming has been found to be dependent on the duration of liming process. En ligne : https://drive.google.com/file/d/1XNT4QFwe_VUEsO1eT5sS1xYqwMjQx9YP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9360 [article]

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Effect of ultrasound on several chromium tanning parameters / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 5 (05/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 5 (05/2010) . - p. 150-159 Titre : Effect of ultrasound on several chromium tanning parameters Type de document : texte imprimé Auteurs : Josep Maria Morera, Auteur ; Esther Bartoli, Auteur ; M. Serrano, Auteur ; F. Ccombalia, Auteur ; E. Borràs, Auteur ; Lluis Ollé, Auteur ; Anna Bacardit, Auteur Année de publication : 2010 Article en page(s) : p. 150-159 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Tannage au chrome Ultrasons Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome tanning with ultrasound - This work studies the effect of several variables on a series of properties of the final leather obtained from chrome tanning, using ultrasounds as the sole mechanical effect during the tanning operation. The variables studied (at two levels by means of a 2 3 factorial design) are tanning temperature, condition of chrome offered (solid or dissolved) and salt basicity. Our studies indicate that the results obtained measuring parameters such as struck-through time of tanning agent, chromium uptake and its distribution, shrinkage temperature, tensile strength, tear load, grain distension and leather burst distention significantly depend on the previously selected level of one or more of the variables being studied. The study of the evolution of the concentration and basicity of the chromium salts has led us to conclude that reutilization is possible. Results show that ultrasound use in chrome tanning is a possibility to consider in the case of leather goods in which the use of drum may not be avisable. En ligne : https://drive.google.com/file/d/1VGwjmGwSc975iHa4k7Ssbw6iRGFjJTj9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9364 [article]

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Research on materials appropriate for restoration - Impacts of ancient and modern tanning techniques on leather character / Bernhard Trommer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 5 (05/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 5 (05/2010) . - p. 160-171 Titre : Research on materials appropriate for restoration - Impacts of ancient and modern tanning techniques on leather character Type de document : texte imprimé Auteurs : Bernhard Trommer, Auteur ; Andreas Schulze, Auteur ; Gabriele Hilsky, Auteur Année de publication : 2010 Article en page(s) : p. 160-171 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Technology for restoration leathers - There now exist a large number of investigations on leather decay and its effect on cultural heritage ; however, appropriated and sustainable sources of restoration leather are missing. Simple test methods and agreements regarding the quality assurance of commercial restoration products are not available. Many of the outstanding properties of ancient leather like long-term stability are attributed to the method of manufacture and the processing auxiliaries' common for the period of origin. The pure replication of the ancient techniques in detail is neither possible nor economically viable. Every step of tannage causes an anticipated step of collagen degradation. Is it possible to obtain a restoration leather of outstanding quality also under modern conditions ? The Saxon States Authority for the Care of Monuments, the Research Institute for Leather and Plastic Sheeting (FILK Freiberg) and the Department of Conservation & Restoration of Moritzburg Castle co-operate in research on material appropriated for restoration of baroque leather wall hangings. The paper presents different characteristics of ancient and modern tanning techniques, practical experiences, test methods and recommendations for the manufacturing of restoration leather. En ligne : https://drive.google.com/file/d/1Zm3q201SW3bGL4XYz1mKkmqw0ge0MGKg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9365 [article]

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