Dépouillements

Novel approach towards high exhaust chromium tanning - Part I : role of enzymes in the tanning process / R. Venba in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 12 (12/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 12 (12/2008) . - p. 401-411 Titre : Novel approach towards high exhaust chromium tanning - Part I : role of enzymes in the tanning process Type de document : texte imprimé Auteurs : R. Venba, Auteur ; Chandra Babu Narasimhan Kannan, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2008 Article en page(s) : p. 401-411 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Stringent environmental regulations on the discharge of pollutants from various industries have prompted researchers to seek the development of eco-benign technologies and process innovations aimed at low-waste and high exhaust chrome tanning systems. However, an effective biotechnological solution for reducing chromium pollution that is cost effective, commercially adaptable high exhaustion chrome tanning process has not been explored. In the present investigation, an attempt has been made to bring about enzyme assisted chrome tanning process using acid protease. The effect of varying conditions of enzyme treatment on the exhaustion of the chrome tanning agent have been studied and the conditions optimized. Three different control chrome tanning systems have been chosen with and without float in the tanning process. In order to have a comparative study, chrome tanning at an offer of 6% and 8% basic chromium sulphate (BCS) in experimental processes has also been performed. It has been observed that the penetration and distribution of chromium is much better for enzyme assisted chrome tanning process at pH 4.5 compared to other systems. There is no surface deposition of chromium in the experimental leathers, although chrome tanning has been carried out at higher pH of 4.5. This has been substantiated through scanning electron microscopic analysis. Chromium exhaustion greater than 95% has been achieved in optimized enzyme assisted chrome tanning systems. The amount of chromium present in these leathers has been relatively higher compared to conventional chrome tanned leathers. The performance characteristics assessed by physical and tactile evaluation of the enzyme assisted leathers has been on par with conventional leathers. En ligne : https://drive.google.com/file/d/16ylAk4UqoEkocabwiRiWInyAsONnQAnM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3253 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
010910	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Evaluation of the energy savings when using vacuum eryers with total thermal energy recovery in tanneries / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 12 (12/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 12 (12/2008) . - p. 412-415 Titre : Evaluation of the energy savings when using vacuum eryers with total thermal energy recovery in tanneries Type de document : texte imprimé Auteurs : Josep Maria Morera, Auteur ; Pere de Cabrera, Auteur ; Luisa F. Cabeza, Auteur ; Esther Bartoli, Auteur Année de publication : 2008 Article en page(s) : p. 412-415 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : One of the operations with large impact in the electrical consumption of a tannery is the drying of the leather. This paper compares the energy efficiency of two different types of vacuum dryers working at low temperature. The objective is to work at low temperature to obtain leather with higher quality. In particular, a traditional vacuum dryer is compared with a vacuum dryer modified to work at low temperature with low energy cost and with considerable economical savings. En ligne : https://drive.google.com/file/d/1kpZb3V1JGItyGbxhHKsqpNsoz29e8cx8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3254 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
010910	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Synthesis of hyper-branched polymer with terminal amidogen and its application as formaldehyde scavenger in leather / Wang Xuechuan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 12 (12/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 12 (12/2008) . - p. 416-421 Titre : Synthesis of hyper-branched polymer with terminal amidogen and its application as formaldehyde scavenger in leather Type de document : texte imprimé Auteurs : Wang Xuechuan, Auteur ; Qiang Taotao, Auteur ; Ren Longfang, Auteur Année de publication : 2008 Article en page(s) : p. 416-421 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A hyperbranched polymer with terminal amidogen was synthesized with succinic anhydride and diethylenetriamine by “one-step method”, and then it was characterized through FT-IR and GPC testing. Moreover, the prepared hyperbranched polymer with terminal amidogen was used to remove free formaldehyde in leather tanned by organic phosphonium tanning agent. The application results indicated that the formaldehyde-removal percentage of hyperbranched polymer with terminal amidogen reached 60.4%. The formaldehyde content of leather reduced to less 50mg/kg. Comparing with other formaldehyde scavengers, its formaldehyde-removal effect was much better. The thickening rate and dye absorptivity of the polymer were 16.7% and 96.5% respectively, so it also had thickening and assisting dyeing effects to leather. En ligne : https://drive.google.com/file/d/1iJdSjqLGqx3bSpcAQtqL1qP72lJLfhsq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3255 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
010910	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Consequence of UV irradiation on the zirconium tanned collagen : a molecular level study / N. N. Fathima in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 12 (12/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 12 (12/2008) . - p. 422-428 Titre : Consequence of UV irradiation on the zirconium tanned collagen : a molecular level study Type de document : texte imprimé Auteurs : N. N. Fathima, Auteur ; C. Pragadhish, Auteur ; B. Purushothaman, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2008 Article en page(s) : p. 422-428 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : UV and heat resistance are very important qualities for many leather applications especially, automobile upholstery. This study explores the effect of UV irradiation on zirconium tanned collagen. The changes in the physio-chemical characteristics of native collagen upon UV irradiation differ from that of the zirconium tanned collagen. The UV absorption characteristics of crosslinked collagen increases, which is attributed to the formation of photoproducts on UV radiation. Zirconium crosslinking has been found to reduce this formation when the duration of irradiation is less. There is a gradual decrease in the emission maxima of crosslinked collagen on increasing the time of irradiation, which is ascribed to conformational changes of the aromatic amino acids residue (tyrosine). The duration of irradiation plays a critical role in the conformational changes brought about by it. Thus, the crosslinking brought about by zirconium aids in imparting stability to collagen against UV irradiation. En ligne : https://drive.google.com/file/d/17h9gxmn8B1UdyOwM0SJkJ45WFcn_R3jX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3256 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
010910	-	Périodique	Bibliothèque principale	Documentaires	Disponible