[article]
| Titre : |
Rapid oxidative unhairing with alkaline calcium peroxide |
| Type de document : |
texte imprimé |
| Auteurs : |
Andrew G. Gehring, Auteur ; David G. Bailey, Auteur ; Gary L. DiMaio, Auteur ; Robert L. Dudley, Auteur ; William N. Marmer, Auteur ; Chad E. Mazenko, Auteur |
| Année de publication : |
2003 |
| Article en page(s) : |
p. 216-223 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Sodium sulfide is frequently used to remove hair from animal hides during tanning operations. However, since sodium sulfide is an environmental pollutant that is quickly converted to highly toxic hydrogen sulfide gas if accidentally exposed to acid, an alternative unhairing agent is desired. We have observed that calcium peroxide may be used to rapidly unhair cattle hides with efficiency similar to that of sodium sulfide. Under alkaline conditions (pH ~13), 5-15 % (w/w) calcium peroxide mixture applied in two back-to-back applications, afforded either complete or nearly complete unhairing within 10 minutes of total reaction time at a reaction temperature of ~45°C. Most of the removed hair was essentially broken down or dissolved in this rapid oxidative hairburn process. Alternatively, intact, long strands of hair could be removed and recovered (hairsave) with a single application of the calcium peroxide solution (solids removed) followed by rapid adjustment of the hair solids to an approximately neutral pH. However, hair stubble remained on the hide after subjected to this latter hairsave process. The alkaline calcium peroxide hairburn and hairsave processes were studied using hide pieces (laboratory-scale experiments) and matched sides (pilot-scale experiments) and compared to conventional hairburn with sodium sulfide. The studies revealed that shrinkage temperature, physical testing, dye shading, dye levelness and grain appearance were comparable. In addition, several commercially available non-sulfide sharpening agents, added during reliming of hide pieces, were demonstrated to remove residual hair stubble that remained after rapid oxidative hairburn. |
| En ligne : |
https://drive.google.com/file/d/1IHk1VAMX6HZM61vQsuat_uami76ko9cI/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4139 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 6 (06/2003) . - p. 216-223
[article]
|
Aller sur edunet
Accueil
Rapid oxidative unhairing with alkaline calcium peroxide in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 6 (06/2003)
