Dépouillements

Use of seawater in leather processing / N. Vedaraman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 9 (09/2003)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 9 (09/2003) . - p. 333-336 Titre : Use of seawater in leather processing Type de document : texte imprimé Auteurs : N. Vedaraman, Auteur ; P. G. Rao, Auteur ; Chellappa Muralidharan, Auteur ; Sathya Ramalingam, Auteur ; K. Iyappan, Auteur Année de publication : 2003 Article en page(s) : p. 333-336 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The leather industry is one of the major consumers of significant quantities of water. There is an urgent need for tanners to conserve water and effect process modifications leading to minimizing the consumption of water,which is currently recognized and adopted to varying extent. As the monsoon fails quite often and the underground water is drastically decreasing, recourses to suitable technologies become essential, especially in tropical countries. Need for specific quality of water for different operations do pose restrictions on use of water from different sources, This paper deals with a study made on use of seawater for leathers processing. The results indicate that pre-treated seawater could be used for select operations in leather processing without any impairment in the leather quality. En ligne : https://drive.google.com/file/d/1sA0ZToQSDlshSoy2vwBZeu0mBp5ICm9w/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4148 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001591	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Estimation of the sulfated glycosaminoglycan content of bovine skin with alcian blue / S. M. Mozersky in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 9 (09/2003)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 9 (09/2003) . - p. 337-343 Titre : Estimation of the sulfated glycosaminoglycan content of bovine skin with alcian blue Type de document : texte imprimé Auteurs : S. M. Mozersky, Auteur ; Renée J. Wildermuth, Auteur ; William N. Marmer, Auteur Année de publication : 2003 Article en page(s) : p. 337-343 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Procedures selected from the work of Bjornsson and Karlsson1,2 for the quantitation of sulfated glycosaminoglycans with Alcian Blue were modified and adapted to the measurement of this type of polysaccharide in bovine skin. Modifications include: (1) pulverization of the skin under liquid nitrogen, (2) brief, gentle digestion of the skin with collagenase, (3) the use of a variety of Alcian Blue widely used in histologic work, (4) the recipe for the preparation of the Alcian Blue reagent solution, (5) determination of suitable sample size, volumes of reagent solutions, incubation times, duration of centrifugation, etc. The procedure developed yields linear results for 50-300 mg samples of skin; the relative standard deviation for the procedure is +-15%. En ligne : https://drive.google.com/file/d/169-ps8Qurgctmtc1WnaY7zuxIjHz9jh_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4149 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001591	-	Périodique	Bibliothèque principale	Documentaires	Disponible

A reliable detection method for Cr(VI) in dyed leathers by Ion chromatography / Rama Jeevan Ganesh Jeevan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 9 (09/2003)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 9 (09/2003) . - p. 344-350 Titre : A reliable detection method for Cr(VI) in dyed leathers by Ion chromatography Type de document : texte imprimé Auteurs : Rama Jeevan Ganesh Jeevan, Auteur ; Ganga Radhakrishnan, Auteur ; Raghavan Chandrasekar, Auteur Année de publication : 2003 Article en page(s) : p. 344-350 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Cr(VI) detection without false positives in coloured (dyed) leather is an important issue. Several studies have highlighted the problems faced and the unreliability of the present official procedures viz. IUC-18, DIN 53314 and EN 420 especially when applied to coloured leathers. This is due to colourants soluble in the extractant interfering seriously when analysed by visible spectrophotometry. In the present study a method has been developed which targets cleaning of the matrix elements mainly dye in the first step, followed by ion chromatography with post column derivatization using DPC (1,5-diphenylcarbazide). The method is found to work with greater reliability, as ascertained from several Cr(VI) spiked studies on deliberated matrix preparations constituting Cr(III) and dyes. The study included analyses of several coloured leathers, and their spiked leather extracts and comparison of official procedures with IC (Ion chromatography) involving wet blue and light coloured leathers. En ligne : https://drive.google.com/file/d/1f9HemdmW4h26JPj3zveWUkKvA8m8Qykm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4150 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001591	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Rapid oxidative unhairing with alkaline hydrogen peroxide / William N. Marmer in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 9 (09/2003)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 9 (09/2003) . - p. 351-358 Titre : Rapid oxidative unhairing with alkaline hydrogen peroxide Type de document : texte imprimé Auteurs : William N. Marmer, Auteur ; Andrew G. Gehring, Auteur ; Robert L. Dudley, Auteur Année de publication : 2003 Article en page(s) : p. 351-358 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Hair can be rapidly removed from a bovine hide with caustic sodium sulfide. A rapid unhairing of the hide while still on the carcass in the slaughterhouse is an attractive alternative, because such a process could be part of a pathogen reduction program targeting the safety of the meat. The major drawbacks to the procedure are the high concentrations of base required for the unhairing, the potential of generating toxic hydrogen sulfide and the disposal of the spent unhairing solutions. We have studied the use of caustic hydrogen peroxide as a potential rapid oxidative unhairing agent to replace sodium sulfide. High concentrations of sodium hydroxide were required for the hydrogen peroxide to be an effective rapid unhairing agent. At these high base concentrations damage to the grain was observed. We were able to reduce the amount of sodium hydroxide and still carry out an effective rapid unhairing by the addition of lime or KOCN to the reaction mixture. An added advantage of using lime or KOCN was the elimination of grain damage. Shrink temperatures and physical test data of the wet blue and crust leather produced from hides that had been unhaired with alkaline hydrogen peroxide were compared to the results obtained from wet blue and crust leather produced from hide unhaired with sodium sulfide/lime/soda ash. The wet blue produced from hides that had undergone the four unhairing protocols had identical shrink temperatures. The shrink temperatures did not correlate to the chromium content of the wet blue. The physical testing data were also identical for all four samples except for the tensile strength and toughness index. The crust leather made from hides unhaired by sodium sulfide/lime/soda ash had significantly lower values. As with the shrink temperatures there was not a correlation between the physical testing results and chromium content. En ligne : https://drive.google.com/file/d/13cgUTWnjrHL6mZ5cUixjGqaFPOTnC2ht/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4151 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001591	-	Périodique	Bibliothèque principale	Documentaires	Disponible