Influence of power ultrasound on leather processing. Part I : dyeing / Jian-Ping Xie in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIV, N° 4 (06/1999)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCIV, N° 4 (06/1999) . - p. 146-157 Titre : Influence of power ultrasound on leather processing. Part I : dyeing Type de document : texte imprimé Auteurs : Jian-Ping Xie, Auteur ; Timothy J. Mason, Auteur ; Geoffrey E. Attenburrow, Auteur ; Ji-Feng Ding, Auteur Année de publication : 1999 Article en page(s) : p. 146-157 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Application of power ultrasound (18kHz - 1MHz) to leather processing has become more viable due to increased commercial availability and advances of ultrasound technology, the apparent applicability of ultrasound across the whole breadth of "wet" processes in leather manufacturing, and tightened environmental legislation which demands new efficient processing technology. Thus power ultrasound (38 kHz, 1.36 W cm-2) has been employed in our systematic investigations on a number of leather processes. In this first part of a series of papers, the effects of power ultrasound on leather dyeing and the factors influencing the effectiveness of ultrasonic dyeing, such as timing, mechanical agitation, temperature, type of dyes, type of leather and dye concentration, have been investigated. It was found that ultrasonic dyeing can increase the degree of dye penetration by 50-120 %, shorten the process time by 40-70 %, facilitate low temperature dyeing or allow a reduction of the dye offer by 30 %. In addition, it can also improve the color fastness particularly to wet rubbing. This remarkable enhancing effect is attributed mainly to an increased diffusion coefficient of dyestuff in leather in the presence of power ultrasound. The results have shown that ultrasound. The results have shown that ultrasound is best applied in the initial stage of the dyeing for a short period of time and is most effective for a dyeing system which has difficulty in achieving high dye exhaustion or penetration. It was found that ultrasound is more effective than mechanical stirring and can be combined with mechanical agitation in accelerating the dyeing process. The influence of temperature is system dependent and there exists an optimal temperature for maximizing the effectiveness of ultrasonic dyeing. Note de contenu : - MATERIALS AND METHODS : Materials - Ultrasonic dyeing facilities - Dyeing experiments - Dyeing of leather powder - Color fastness to dry and wet rubbing - RESULTS AND DISCUSSIONS : Effects of ultrasound on dye penetration and kinetics of leather dyeing - Effects of ultrasound on dye offer - Effects of ultrasound on color fastness to rubbing - Factors influencing the effectiveness of ultrasonic dyeing En ligne : https://drive.google.com/file/d/1YWHYnnLrFtq_BE21fp6Cq92sTTJnKMhZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4457 [article]

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