Composite drying with simultaneous vacuum and toggling / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 4 (04/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 4 (04/2009) . - p. 131-138 Titre : Composite drying with simultaneous vacuum and toggling Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Liu Linshu, Auteur ; Nicholas P. Latona, Auteur ; Neil M. Goldberg, Auteur ; Peter H. Cooke, Auteur Année de publication : 2009 Article en page(s) : p. 131-138 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Drying is one of key steps to govern the physical properties of leather and it is where leather acquires its final texture, consistency and flexibility. Recently we have been working diligently to improve chrome-free leather by optimizing its drying process. We developed a drying method using a combination of toggle and vacuum drying together. This is because vacuum drying offers fast speed at a low temperature, which is particularly advantageous to heat-vulnerable chrome-free leathers. On the other hand, adding a toggle action during vacuum drying can significantly increase the area yield. We explored this composite drying method and investigated how drying variables affect mechanical properties and area yield of chrome-free leather. This study showed that the stretch applied in a drying operation significantly affects stiffness and area yield. We also observed that biaxial stretch increases tensile strength but has less effect on fracture energy. Our study also showed that tensile strength increases with apparent density and decreases with drying rate. Under an optimal drying condition, a 16% increase in area yield with good properties can be achieved. En ligne : https://drive.google.com/file/d/1IP_KXJiCVd69R_bbcNpNEo3BccKiNcG7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4806 [article]

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The use of mixed tocopherols to improve UV and heat resistance of leather / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 1 (01/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 1 (01/2010) . - p. 9-15 Titre : The use of mixed tocopherols to improve UV and heat resistance of leather Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Liu Linshu, Auteur ; Nicholas P. Latona, Auteur ; Mila Aldema-Ramos, Auteur Année de publication : 2010 Article en page(s) : p. 9-15 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux Cuirs et peaux -- Propriétés mécaniques Photostabilité Résistance au rayonnement ultraviolet Résistance thermique Solidité de la couleur Vitamine E Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Most leather products are constantly exposed to outdoor environments, therefore UV and heat resistance are very important qualities, particularly for non-chrome-tanned (chrome-free) leather. In recent years, we have addressed this problem and focused on an environmentally friendly finishing process that will improve the UV and heat resistance of leather. Tocopherols are well-known antioxidants commonly used in the cosmetic and food industries. Tocopherols have been reported as potent free radical scavengers and highly protective agents for collagen fibers against UV and heat damage. Our previous research on alpha-tocopherol showed that it significantly improved UV and heat resistance of leather. Mixed tocopherols, on the other hand, are more abundant and are produced from a renewable source such as soybeans. We have investigated its potential to be applied to leather for improving UV and heat resistance. Experiments were conducted by adding 5 to 12% mixed tocopherols to the grain layer finishes of chrome-free leather. The treated samples were tested in a weatherometer, where they were exposed to artificial sunlight at a high temperature. Colorfastness and mechanical properties tests showed that mixed tocopherols significantly improved UV and heat resistance of leather. Note de contenu : - EXPERIMENTAL : Materials and procedure : Leather preparation - Scanning Electron Microscopy - Leather properties testing - RESULTS AND DISCUSSION : Color lightfastness - tensile properties - Stiffness - Dynamic mechanical behavior - Table 1 : Coating experiments En ligne : https://drive.google.com/file/d/1Ixua0RX4chrgsMRgnyMy1z5ViqLMIkyk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8090 [article]

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