Titre : |
Unhairing with enzymes |
Type de document : |
texte imprimé |
Auteurs : |
A. Crispim, Auteur ; M. MOTA, Auteur |
Année de publication : |
2003 |
Article en page(s) : |
p. 198-202 |
Note générale : |
Bibliogr. |
Langues : |
Anglais (eng) |
Catégories : |
Cuirs et peaux Epilage enzymatique
|
Index. décimale : |
675 Technologie du cuir et de la fourrure |
Résumé : |
The use of enzymes in the leather industry is increasing and their application is being widened to include operations such as de-greasing, unhairing and other wet-end operations. Enzymes can also be used to assist with recycling leather wastes as well as to avoid pollution. The present work is devoted to illustrate the potential application of enzymes in unhairing without hair destruction. Enzymatic unhairing is based upon the weakening of the epidermis basal layer to which the hair is attached. The hair root is weakened and the hair may then be removed without being destroyed. Two alkaline enzyme preparations were used for this work. After the physical removal of the hair, the quality of the hides was evaluated and the wastewater characterised. As compared with the classical sulphide unhairing method, a 50% reduction of sulphide was observed in the wastewater, as well as a 40% reduction in the suspended solids level.
Furthermore, the reduction in sulphide reduced odours and made it possible, by simple oxidation, to convert all the sulphide to sulphate giving concentrations well below environmental specifications. |
Note de contenu : |
- Table 1 : Sodium sulphide and enzyme quantities used in each trial
- Table 2 : Sodium sulphide and organosulphur compound quantities used in each pilot scale trial with Riberzym MPX
- Table 3 : Sodium sulphide and organosulphur compound quantities used in each pilot scale trial with Erhavit MC
- Table 4 : Unhairing evaluation
- Table 5-1 : Pollution load of the resulting bath from the small scale trials done with Erhavit MC
- Table 5-2 : Pollution load of the resulting bath from the small scale trials done with Riberzym MPX
- Table 6 : Evaluation of unhairing, tightness and softness
- Table 7 : Evaluation of grain cracking and tear strength
- Table 8 : Pollution load of the bath from the pilot scale trials |
En ligne : |
https://drive.google.com/file/d/1DjUnZZ4PO6MHQc_mWj-8mrjTZ2po0j4B/view?usp=drive [...] |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39745 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 87, N° 5 (09-10/2003) . - p. 198-202