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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Molecular investigation of valonea tannin / Hasan Ozgunay in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 5 (05/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 5 (05/2007) . - p. 154-157 Titre : Molecular investigation of valonea tannin Type de document : texte imprimé Auteurs : Hasan Ozgunay, Auteur ; O. Sari, Auteur ; M. Tozan, Auteur Année de publication : 2007 Article en page(s) : p. 154-157 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Valonea is one of the well-known vegetable tannins, used for tannage and retanning processes in leather making. Although it is used very extensively in the leather industry, its main components and chemical structure are only gradually being identified. In order to investigate the chemical structure of valonea with novel techniques, MALDI-TOF (Matrix-Assisted Laser Desorption/Ionisation Time-of-Flight) and FTIR (Fourier Transform Infrared) Spectroscopy were used. The MALDI-TOF spectrum showed the presence of low molecular weight fraction of hydrolysable tannins such as nonahydroxytriphnoic, flavogallonic acid, ellagic and gallic acid, pentagalloylglucose and all sorts of degradation and oxidation products which are thought to be major components of valonea tannin. Moreover, castalagin/vescalagin and those added by a few residual structures/atoms, thus creating larger molecule and greater mass than castalagin/vescalagin, derived by internal rearrangements of a larger molecule constitute major components of valonea. En ligne : https://drive.google.com/file/d/1hMr5rCXaRvKqZixOP6Sa22ehFlRnfyvC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3356 [article]

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Studies on the mechanism of enzymatic degradation of dung / M. Tozan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 5 (05/2002)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 5 (05/2002) . - p. 178-188 Titre : Studies on the mechanism of enzymatic degradation of dung Type de document : texte imprimé Auteurs : M. Tozan, Auteur ; C. S. Evans, Auteur ; Anthony D. Covington, Auteur Année de publication : 2002 Article en page(s) : p. 178-188 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure En ligne : https://drive.google.com/file/d/1THgfqWYm63Yz7y89EYd4dEl6OIP2q1fN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4308 [article]

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