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Studies on the influence of proteolytic enzymes in leather dyeing / Swarna Vinodh Kanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 12 (12/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 12 (12/2006) . - p. 435-443 Titre : Studies on the influence of proteolytic enzymes in leather dyeing Type de document : texte imprimé Auteurs : Swarna Vinodh Kanth, Auteur ; S. Sadulla, Auteur ; Chandra Babu Narasimhan Kannan, Auteur ; Arjunan Yasothai, Auteur ; P. Chitra, Auteur ; Malathy Jawahar, Auteur ; Balaraman Madhan, Auteur ; R. Venba, Auteur Année de publication : 2006 Article en page(s) : p. 435-443 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Dyeing is an important process in the leather industry. It is well known that many of the dyes used do not exhaust completely and this causes concern, as the biotreatability of the unexhausted dyes in effluent is normally difficult. Environmental concern demands the improvement of the exhaustion of dye. To achieve increased uptake of dye, an eco-friendly dyeing process is designed using enzymes. The effect of varying conditions of enzymatic treatment on the exhaustion of the dye, levelness of the dyeing, shade brightness and color intensity have been studied and the conditions optimized. The improvement in dye exhaustion is accomplished using extremely low amounts of enzymes in the presence of other post tanning auxiliaries at optimized pH, temperature and running time. The change in shades obtained is quantified by reflectance measurements and compared with the visual assessment data. Scanning electron microscopy analysis showed an opened up and cleaned fiber matrix with enzymatic treatment. The bulk properties viz., softness and grain smoothness are found to be marginally improved in the enzyme treated leathers. The strength properties are not significantly altered by the use of enzymes in the post tanning process. En ligne : https://drive.google.com/file/d/1M5EoprOEdJg2hG7DlXzk2ZVNqOyT1NwK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3852 [article]

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Studies on the stabilization of collagen using dialdehyde starch : Part I. Effect of autoclaving on dialdehyde starch / Swarna Vinodh Kanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 12 (12/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 12 (12/2006) . - p. 444-453 Titre : Studies on the stabilization of collagen using dialdehyde starch : Part I. Effect of autoclaving on dialdehyde starch Type de document : texte imprimé Auteurs : Swarna Vinodh Kanth, Auteur ; Balaraman Madhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur ; S. Sadulla, Auteur ; T. Ramasami, Auteur Année de publication : 2006 Article en page(s) : p. 444-453 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Polysaccharides are abundant, non-toxic, biodegradable natural polymers possessing a high degree of functionality. Starch, an inexpensive and renewable material is modified and widely used as a raw material in various industries. Starch on selective oxidation gives dialdehyde starch (DAS), a polymeric dialdehyde. In this investigation tanning system using autoclaved dialdehyde starch (ADAS) has been explored. Autoclaving of DAS is found to result in hydrolysis to lower molecular weight oligomeric species. These lower molecular weight species show better tanning properties compared to unautoclaved DAS. Similar effect has also been observed on the use of DAS at alkaline conditions. Thermal and enzymatic stability of ADAS tanned leather at varied concentration, pH, time and temperature have been studied. Leathers with a maximum shrinkage temperature of 88°C have been obtained while using ADAS at pH 10. The ADAS tanned leather also imparted highest degree of, stability to collagen against collagenase at pH 10. Scanning electron microscopic analysis showed a well-coated fiber matrix. The leathers obtained using ADAS as tanning agent have been compared with chrome tanned leathers for organoleptic properties. En ligne : https://drive.google.com/file/d/1wQX26JG9XSgtHqb_LAsdaMCJt0wKEg9M/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3853 [article]

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Study of a chrome tanning process without float and with low-salt content as compared to a traditional process. Part II / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 12 (12/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 12 (12/2006) . - p. 454-460 Titre : Study of a chrome tanning process without float and with low-salt content as compared to a traditional process. Part II Type de document : texte imprimé Auteurs : Josep Maria Morera, Auteur ; Anna Bacardit, Auteur ; Lluis Ollé, Auteur ; J. Costa, Auteur ; Heinz-Peter Germann, Auteur Année de publication : 2006 Article en page(s) : p. 454-460 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The process of pickle-tanning results in the significant pollution of wastewaters through the presence of chrome and chlorides. A new process has been studied in order to reduce the negative environmental effect that pickle-tanning causes on leather making. The new process involves a pickle without float and with minimum salt offer as well as the substitution of the inorganic acid by a sulphoaromatic acid. By doing so, the required additions of chrome salt and salt are minimized and this results in high levels of chromium exhaustion in the residual float. When this process is compared to the traditional one, the results obtained indicate that there is a 78 percent reduction in residual float volume, a 93 percent reduction in chlorides content in the effluent and a 95 percent reduction in chrome content in the float. En ligne : https://drive.google.com/file/d/1YfNzvhnRc2AMMYbbn0Myy9IC5c1V0jp1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3854 [article]

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Alternative solutions for fungal protection of packaged wet blue / George Stockman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 12 (12/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 12 (12/2006) . - p. 461-466 Titre : Alternative solutions for fungal protection of packaged wet blue Type de document : texte imprimé Auteurs : George Stockman, Auteur ; Ravindran Rangarajan, Auteur ; Dean Didato, Auteur Année de publication : 2006 Article en page(s) : p. 461-466 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Every year, fungal growth on wet blue causes significant, costly damage measured as rework and downgrading of the resulting leather. Even the best mold control programs are prone to failure now and again. The reasons are varied and range from the programmed decomposition of fungicides in the wet blue to environmental exposure to the occurrence of mold species that could not be anticipated during fungicide selection. Tanners are always on the lookout for a novel antifungal substance that can be applied after palletizing, immediately prior to packaging of the wet blue. Such a post-process spray would provide just ehough added protection to minimize damage during extended shipment and storage intervals. Several synthetic fungicides have shown to be effective in this role, but their toxicity profiles preclude their being applied to the palletized wet blue by spray application. A group of low risk, environmentally benign substances has shown significant antifungal properties when applied to wet blue. The extracts of select naturally occurring plants have been tested for efficacy against commonly encountered molds. These compounds can be applied to the substrate with other commonly available organics by spray application, while presenting minimal risk to the user or the environment. This new family of leather fungicides can be used as part of an integrated system of wet blue fungal protection. As such, they will complement the existing wet blue fungicide programs to help extend storage intervals. En ligne : https://drive.google.com/file/d/1Ra-BluONF5r94OWyBUbuzRtkKkSA7AjP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3855 [article]

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