Development of leather processing method in narrow pH profile : Part 2. Standardisation of tanning process / P. Thanikaivlaen in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 3 (05-06/2001)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 3 (05-06/2001) . - p. 106-115 Titre : Development of leather processing method in narrow pH profile : Part 2. Standardisation of tanning process Type de document : texte imprimé Auteurs : P. Thanikaivlaen, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2001 Article en page(s) : p. 106-115 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eau -- Consommation Liqueurs de tannage -- Analyse Normalisation pH Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Conventional methods employed in leather processing subject the skin or hide to wide variations and alterations in pH. This contributes to an increase in COD. TDS. chlorides, sulphate and other minerals in tannery waste waters. A process sequence has now been explored to limit the pH range in leather processing from 4.0 to 8.0. In the previous investigation, development of a dehairing process at pH 8.0 was demonstrated. In this investigation, an appropriate tanning system with adequate opening—up at a pH range of 4.0—8.0 has been investigated. The required fibre opening was achieved by means of lyotropic rather than osmotic swelling. The conditions for chrome tanning were standardised without conventional pickling. A sequence of operations, viz., enzyme assisted zero-lime dehairing, lyotropic swelling for fibre opening and pickle-less chrome tanning provides leathers matching the functional performance of commercial upper leathers. The modified process leads to a substantial environmental benefit as observed in the reduction of chemical oxygen demand and total solids when compared to conventional processes. The process explored appears to be economy viable. Note de contenu : - EXPERIMENTAL PROCEDURES : Optimisation of opening-up of fibre bundles - Standardisation of tanning system - Selection of tanning system - Comparison of efficiency of selected tanning system with conventional tanning process - RESULTS AND DISCUSSION : Standardisation of opening-up of fibre bundles - Standardisation of tanning system - Selected tanning system vs. conventional tanning system - Feasibility study - Table 1 : Layer wise chromium content for pieces treated with enzymes and lyotropic agent (urea) - Table 2 : Comparison of topological and stratigraphic distribution of chromium in control and experimental et-blue sides - Table 3 : Comparison of characteristics of spherical particles in different chrome tanning systems - Table 4 : Physical testing data of control and experimental leathers - Table 5 : Analysis of spent chrome Iiquors - Table 6 : Composite liquor analysis for conventional and experimental leather processing - Table 7 : Comparison of water and time requirement for conventional and experimental leather processing En ligne : https://drive.google.com/file/d/1fgtfGb6Cx6of1gWWKLw3QLB7i5opsjxE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40365 [article]

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