[article]
| Titre : |
Ultrasound assisted diffusion in vegetable tanning for leather processing |
| Type de document : |
texte imprimé |
| Auteurs : |
Venkatasubramanian Sivakumar, Auteur ; M. V. Harikrishnan, Auteur ; K. Gopi, Auteur |
| Année de publication : |
2008 |
| Article en page(s) : |
p. 330-337 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Vegetable tanning is one of the more versatile tanning methodologies involving natural materials. The problem associated with this tanning method is that it takes longer time for diffusion of vegetable tanning agents (VTA) thoug the pelt matrix. Therefore, there is a pressing need to transform this traditional eco-friendly tanning process into a tanner friendly efficient methodology by way of augmentation techniques such as the use of ultrasound. In the present paper, influence of ultrasound on vegetable tanning process has been studied. The influence of important process parameters such as process time, ultrasonic power, pre-tanning on VTA uptake has been investigated. The effect of ultrasonic power on shrinkage temperature of tanned leather has also been studied. The results indicate that there is a significant enchancement in vegetable tanning process due to the use of ultrasound. There is about 30-40 % increase in % uptake of VTA of VTA due to the use of ultrasound for 120-210 watts. In order to find out the possible mechanism for the enhancement with ultrasound, effect of pre-sonication of substrate (pelt matrix) as well as substance (VTA) has been studied. There is an appreciable reduction in the particle-size of VTA due to sonicationprior to tanning process aiding penetration. diffusion coefficient (D) of VTA during the tanning process has been calculated from the experimental data which indicates nearly two fold increase in the D value 2.64 x 10-5 cm2/sec) due to ultrasound under the given process conditions. Therefore, ultrasound application in vegetable tanning proccess could improve the diffusion rate leading to significant savings in process time and enhancementn in quality of the tanned leather. This methodology can be easily adopted in existing paddle or tanning pit systems for large scale production. Hence, this novel technique is a viable option for tanners in near future. |
| En ligne : |
https://drive.google.com/file/d/1oPyAT4I2Qw5rbeLgjuo6crxAzjyIEY41/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2409 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 10 (10/2008) . - p. 330-337
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Ultrasound assisted diffusion in vegetable tanning for leather processing in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 10 (10/2008)
