Countercurrent-driven continuous tanning of natural leather / D. M. Turtoi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 1 (01-02/2003)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 87, N° 1 (01-02/2003) . - p. 15-19 Titre : Countercurrent-driven continuous tanning of natural leather Type de document : texte imprimé Auteurs : D. M. Turtoi, Auteur ; N. P. Slemcu, Auteur ; M. S. Belcu, Auteur ; E. I. Tudorache, Auteur ; I. Untea, Auteur ; D. Brasoveanu, Auteur Année de publication : 2003 Article en page(s) : p. 15-19 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux Solutions (chimie) Tannage au chrome Transfert de masse Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The present study was aimed to increase the mass transfer rate inside leather, thus allowing the use of concentrated solutions and consequently a reduction in pollutant quantities. Alaboratory installation for wet processing and tanning leather was conceived and put into operation. It is based on the almost instantaneous absorption of the processing solutions by the compressed leather after the compression is removed. The possibility of applying the countercurrent process for pickling and chromium fixing inside the leather was studied. The process parameters taken into consideration were: the concentration and the basicity of the basic chromium sulphate solutions, the intermediate basification of the solution, the intensity, frequency and number of pressing operations, the insertion of rest periods between the pressing operations, the partial removal of pickling solutions before the treatment with chromium solutions. The treated leather was analysed for total, soluble and fixed chromium, stratigraphic distribution, shrinkage index and moisture content were determined. Some correlations between the process parameters and the final leather characteristics were determined. Note de contenu : - Fig. 1 : Laboratory installation for continuous countercurrent-driven wet tanning ; 1 - upper compression tambour ; 2 - processed skin ; 3 - lower tambour ; 4 - tank ; 5 - lead disks; 6 - toothed wheel ; 7 - toothed belt ; 8 - driving toothed wheel ; 9 - tanning solution - Fig. 2 : Section of the pilot installation with unequal tambours for continuous, countercurrent-driven tanning ; 1 - upper compression tambour ; 2 - upper guide ; 3 - processed skin ; 4 - lower tambour ; 5 - lower guide ; 6 - liquid level - Fig. 3 : Section of the pilot installation with equal tambours for continuous, countercurrent-driven tanning ; 1 - upper compression tambour ; 2 - processed skin ; 3 - driving, lower tambour ; 4 - guides ; (P1 < P2 < P3) - Table 1 : Data on the chromium take-up for samples subject to multiple compressions - Table 2 : Compression conditions and stratigraphic distributions En ligne : https://drive.google.com/file/d/1v47g-eI9iM1fIquIQlkjBkjEYkiMO9Px/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39806 [article]

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