Investigation of the structure of leathers tanned with chrome-zirconium complex tanning material / T. Karnitscher in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 68 (Année 1984)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 68 (Année 1984) . - p. 8-12 Titre : Investigation of the structure of leathers tanned with chrome-zirconium complex tanning material Type de document : texte imprimé Auteurs : T. Karnitscher, Auteur ; F. J. Tothné, Auteur ; I. T. Skaranda, Auteur Année de publication : 1984 Article en page(s) : p. 8-12 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chrome Cuirs et peaux -- Analyse Microscopie électronique à balayage Tannage minéral Tannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium Zirconium Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In recent years there came to the fore the use of those tanning preparations which confer more advantageous leather properties because of their many functional groups. In order to extend the influence of the widely used chrome tannage there are available in the leather industry several products which are chemically modified with other metal salts including zirconium salts. We are well aware of the problems of the zirconium tannage and of the succeeding operations, e.g that the process is suitable for the tannage of upper leathers only to a limited extent. The leathers tanned by this method are very well filled and are also tight. They do not possess the softness and elasticity required for shoe upper leather. These negative properties do not appear if the tannage is performed with a chrome-zirconium complex compound because the chrome-zirconium complex is linked in a different manner to the collagen. Tannages performing differently yield leather with different properties which can be characterised both by organoleptic tests and by means of objective instrument measurements. The differences in the macroscopic dimension are followed in all cases by the change of microstructure. In order to follow these alterations many researchers have applied -die scanning electron microscope (SEM) which has turned out to be a useful instrument for gaining knowledge of fibre structure relationships which were not known before, e.g. for the study of the influence of enzymes on leather structure, for the investigation of the structure of pigskins during the leather process and in other fields of leather research. This instrument, developed on the basis of the technical results of the last ten years, makes possible the study of the least fibre structure units of leather, i.e. the study of the fibres and fibrillae. This instrument has the advantage that no preparation of ultrathin sections is needed, but is unavoidable for tests performed with transmission electron microscopes working similarly with several ten thousand-fold magnification. The stereoscopic micrographs that can be made with the scanning electron microscope (SEM) greatly advance the study of the arrangement of the structural units investigated. In the course of examining the influence of the chrome-zirconium complex tanning material, we studied (with the aid of scanning electron microscope investigations) the connection between the structure and properties of leathers tanned with different minerai tannages. Note de contenu : - Preparation of the leather for the SEM investigations - Evaluation of the SEM micrographs - Fig. 1 : Scanning electron microscope micrograph of fibres of cattlehide tanned with zirconium salt - Fig. 2 : Scanning electron microscopemicrograph of cattlehide tanned with chrome-zirconium mixture tanning material - Fig. 3 : Scanning electron microscope micrograph of fibres of cattlehide tanned with chrome-zirconium complex material - Fig. 4 : Cross-section and torn surface of elementary fibres cattlehide tanned with chrome-zirconium complex tanning material - Fig. 5 : Scanning electron microscope micrograph of elementary fibres En ligne : https://drive.google.com/file/d/1_TPAmjW9dOTPfKX_13h3VmBhiH5QlQju/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34142 [article]

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