[article]
| Titre : |
Underlying principles in chrome tanning : Part 1. Conceptual design of pickle-less tanning |
| Type de document : |
texte imprimé |
| Auteurs : |
Wondu Legesse, Auteur ; Palanisamy Thanikaivelan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur |
| Année de publication : |
2002 |
| Article en page(s) : |
p. 475-486 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
The do-undo methods adopted in conventional leather processing generate huge amounts of pollutants. In this context pickle-less chrome tanning is becoming crucial to the tanners due to these environmental problems. However, a standard process with optimal pH and other parameters especially the need and the amount of masking is still lacking. In this investigation an attempt has been made to tan the cowhides using commercially available basic chromium sulfate at various pH's namely 8.0, 7.0, 6.0 and 5.0 without salt. Three acid systems have been chosen both with and without masking to adjust the pH's. In order to have a comparative study normal pickling to pH 3.0 as well as partial pickling to pH 4.0 have also been performed. It has been observed that the penetration and distribution of chromium is much better for pH 5.0 as 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. This has been substantiated through scanning electron microscopic, energy dispersive X-ray analysis and stratigraphic chrome distribution analysis. The exhaustion of chromium is above 90% in most of the chrome tanning systems and the amount of chromium present in the leather is relatively higher as compared to conventional chrome tanned leathers. Performance of the leathers is shown to be on par with conventionally treated leathers through physical and tactile evaluation. The process also enjoys reduction in total solids and chloride loads by 78 and 96%, respectively from the identified streams. |
| En ligne : |
https://drive.google.com/file/d/1lMYu10DJwO9cc3lh1w8ntTBTVvexGV7U/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4240 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 12 (12/2002) . - p. 475-486
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Underlying principles in chrome tanning : Part 1. Conceptual design of pickle-less tanning in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 12 (12/2002)
