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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Investigation of the feasibility of using powder coating for leather finishing / M. Tozan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 84, N° 4 (07-08/2000)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 84, N° 4 (07-08/2000) . - p. 187-191 Titre : Investigation of the feasibility of using powder coating for leather finishing Type de document : texte imprimé Auteurs : M. Tozan, Auteur ; Ji-Feng Ding, Auteur ; Geoffrey E. Attenburrow, Auteur Année de publication : 2000 Article en page(s) : p. 187-191 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Colles:Adhésifs Cuirs et peaux -- Finition Douceur (toucher) Matériaux -- Cuisson Pulvérisation électrostatique Résistance à l'abrasion Revêtements poudre Surfaces (Physique) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The feasibility of using powder coating technology, a process involving dry solid particulates, has been investigated for leather finishing for the first time. Results showed that powders can be applied to leather successfully using conventional electrostatic spraying facilities, provided that the leather is properly wetted with water. Powders can also be successfully applied to leather using non-electrostatic application methods, after pre-treating the leather surface with a tack agent, such as a soft resin, that makes the leather surface tacky and therefore receptive to powders. Finishing trials on leather using currently available commercial powder coatings have shown that a surface coating with an appearance no different to a conventional pigmented finished leather can be achieved without loss of area or softness, provided that stoving conditions are controlled (160°C for 10 minutes). Although the coating was incompletely cured, it still provided excellent wet and dry rub fastness, sufficient dry adhesion and adequate wet adhesion properties. However, the coating was not completely satisfactory due to the occurrence of surface cracking and poor flexing endurance. This was because the powder coating used had not been specifically formulated for leather finishing. Note de contenu : - EXPERIMENTAL TECHNIQUE : Materials - Application of the powder to leather surface - Stoving and determination of area loss - PHYSICAL TESTING - RESULTS AND DISCUSSION : Powder application techniques for leather - Stoving condition and area loss - Stoving and the softness - Stoving and appearance - Dry and wet rub fastness - Finish adhesion - Table 1 : Softness of the same leather sample before and after powder coating finishing. Softness was determined by BLC softness gauge En ligne : https://drive.google.com/file/d/1j_PcSCcwVEZbCZFvPmx4ndKhVj2PRJG9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41003 [article]

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