| Titre : |
An integrated eco-friendly tanning method for the manufacture of upper leathers from goatskins |
| Type de document : |
texte imprimé |
| Auteurs : |
Subramanian Saravanabhavan, Auteur ; Rathinam Aravindhan, Auteur ; Palanisamy Thanikaivelan, Auteur ; B. Chandrasekaran, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur |
| Année de publication : |
2003 |
| Article en page(s) : |
p. 149-158 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Coût-Efficacité
Cuir -- teneur en chrome
Cuirs et peaux de chèvres
Déchets -- Réduction
Eau -- Consommation -- Réduction
Eaux usées -- Analyse
Epilage enzymatique
Tannage au chrome
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Present leather-making processes cause difficulties, with regard to their perceived environmental impact. Pre-tanning and tanning processes contribute more than 90% of the total pollution load from leather processing.
Conventional process methods subject the skin to wide variations in pH. Such pH changes, lead to salt formation which results in a net increase in COD, TDS, chlorides, sulphates and chromium levels in tannery wastewaters.
In this study, a three-step process sequence has been explored to limit the pH range in leather processing to between 4.0-8.0. A sequence of operations, viz. enzyme unhairing, NaOH based fibre opening and pickle-less chrome tanning produces leathers matching the functional performance of conventionally processed leathers but leading to substantial environmental benefits in the reduction of COD and total solids by 43 and 70%, respectively. Water consumption for processing is reduced to 17.81/Kg raw hide. The process sequence explored appears to be economically viable. |
| Note de contenu : |
- EXPERIMENTAL METHODS :
- Standardisation of dehairing process
- Standardisation of opening up of fibre bundles
- Experimental tanning process (E)
- Conventional tanning process (C, as followed in India)
- EXAMINATION OF THE LEATHERS :
- Input-output analysis
- Scanning electron microscopic examination
- RESULTS AND DISCUSSION :
- Standardisation of dehairing system
- Standardisation of NaOH for opening up of fibre bundles
- INTEGRATED THREE STEP TANNING PROCESS : AN APPRAISAL
- Softness measurements
- Scanning electron microscopic analysis
- Chromium in leather
- OBJECTIVE AND SUBJECTIVE METHODS OF EVALUATION OF THE LEATHER
- Strength characteristics
- Tactile properties
- Environmental benefits
- Techno-economic viability
- INPUT-OUTPUT AUDIT OF THE EXPERIMENTAL AND CONTROL PROCESS
control process
- Table 1 : Composition of depilatory mixture* for different methods of application
- Table 2 : Extent of swelling and cross section pH of the pelts from preliminary fibre opening trials
- Table 3 : Compression measurement and gradient data for control (C) and experimental (E) crust Leathers
- Table 4 : Comparison of chromium content in wet blue leathers from control (C) and experimental (E) processes
- Table 5 : Physical testing data of control (C) and experimental (E) leathers
- Table 6 : Composite liquor analysis
- Table 7 : Comparison of water requirement and discharge for control (C) and experimental (E) leather processing of 1 kg raw skins
- Table 8 : Time and power consumption for the conventional (C) and experimental tanning (E) processes
- Table 9 : Cost estimates of the conventional (C) and experimental tanning (E) processes
- Table 10 : Input-output audit for both control and experimental process |
| En ligne : |
https://drive.google.com/file/d/1jxj7vQuxr9IAA_lOPXzd04eZ-44Kkiva/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39771 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 87, N° 4 (07-08/2003) . - p. 149-158
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