[article]
| Titre : |
Optimum chrome tanning ofhides and modified Thrublu process for lime-split hides |
| Type de document : |
texte imprimé |
| Auteurs : |
Samir Dasgupta, Auteur |
| Année de publication : |
2005 |
| Article en page(s) : |
p. 17-21 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Tannage au chrome
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Chrome tanning for a long lime enjoyed a unique position amongst tanners all over the world and almost 90% of leather produced is chrome tanned. Of all these benefits, high shrinkage temperature bas been the paramount feature in favour of chrome tanning as this cannot be achieved by any other tanning systems. A number of studies have been published recently suggesting that Chromium(III) itself may be toxic at higher levels under certain ligand environment and Chromium(VI) is a known carcinogen. So, tanners have to consider how best to modify their chrome tanning process for better exhaustion of chrome and look for alternative means to minimise the impact of tanning on the environment. LASRA research has shown that none of the alternatives to chrome free tanning systems are as cost effective and cheap than chrome tanning. The best commercial option is, therefore, to develop an effective chrome management system for the tannery.
Several chrome management technologies have emerged recently. Among the options available is the no pickle ThruBlu process, first introduced for lambskins in 1993 at LASRA Conference by DasGupta and further developed and subsequently extended to split hides tannages. h is is the most cost effective and easily adoptable. But this novel system challenges the basic established theory of chrome tanning and therefore demands conviction from tanners. The partial substitution of chromium with alternative tanning agents like Oxazolidine E (Zolidine E, Angus Chernicals), THPS (Albrite AD, Rhodia) is also promising because this combines benefits of both the tanning materials.
To develop an effective optimum system, a tanner must first find out what is the minimum amount of chrome that is required to satisfy his customer requirements, both in respect of dye ability and other performance requirements. This is a must before subsequent options can be considered, such as :
- Simply recycling the chrome exhaust in pickle
- Precipitate the chrome in the exhaust liquor, then deposit the cake in land fill
- Precipitate the chrome in the exhaust liquor, regenerate as chrome tanning agent for reuse.
This report outlines systems which give an optimum chrome tanning of hides. Further, LASRA ThruBlu process that was originally devised for delimed hides, has been modified for chrome tanning of pickled hides to minimise chrome in exhaust liquors. |
| Note de contenu : |
- The optimum chrome tannage of hides
- Modification of the Thrublu process : Residual formaldehyde in the modified Thrublu leather
- Panel 1 : 1. Effect of chrome offer on shrinkage temperature of wet blue sides, °C - 2 : Effect of chrome offer on the residual chrome in exhaust liquor - 3 : Layerwise distribution of chrome in side leather
- Panel 2 : 1 : Tear and tensile strength of chrome tanned side leather - 2 : Grain strength of chrome tanned side leather
- Panel 3 : The original LASRA ThruBlu process
- Panel 4 : 1. Effect of tannage on the shrinkage - 2. Layerwise distributionof chrome in leather
- Panel 5 : 1. Tear and tensile strength of chrome side leather - 2. Grain strength of chrome tanned side leather
- Panel 6 : Softness of chrome tanned side leather
- Panel 7 : Formaldehyde content of chrome tanned side leather |
| En ligne : |
https://drive.google.com/file/d/1rfPARWOhJl1od96TFxYmhydX-2k77r0M/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32492 |
in WORLD LEATHER > Vol. 18, N° 7 (11/2005) . - p. 17-21
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Optimum chrome tanning ofhides and modified Thrublu process for lime-split hides in WORLD LEATHER, Vol. 18, N° 7 (11/2005)
