Dyeing properties of natural leather using red natural dyes / Sang Chul Lee in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 6 (11-12/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 6 (11-12/2014) . - p. 252-258 Titre : Dyeing properties of natural leather using red natural dyes Type de document : texte imprimé Auteurs : Sang Chul Lee, Auteur ; Eun Chul Shin, Auteur ; Won Ju Kim, Auteur Année de publication : 2014 Article en page(s) : p. 252-258 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Champignons microscopiques Cochenilles Colorants végétaux Cuirs et peaux -- Teinture Extraction (chimie) Frottements (mécanique) Photostabilité Plantes tinctoriales Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : An environment-friendly, non-toxic, red-dyed leather was developed using four naturel dyes -cochineal, lac, beet red, and monascus. The affects of the dye concentration, dyeing time, and temperature on the light fastness, rubbing fastness, colour difference, and K/S values (i.e., each dyed sample's apparent depth value) were investigated to find the hast natural dye for eco-dyeing the Ieather. When dyeing the leather red, the K/S value generally increased as concentrations of cochineal, monascus, lac, or beet red dyes were increased. However, the increase in the K/S value was substantially lowered when more than 5.0% o.w.l. (on the weight of Ieather) was used, indicating that the optimal dye concentration is 5.0 % o.w.l. A dyeing Urne of 100 minutes was found to be optimal because the K/S value stabilized aller 100 minutes. The use of cochineal 5.0 % o.w.l. resulted in a 9.18 RP (plum) and the use of lac 5.0 % o.w.l. resulted in a 9.52 RP. These resuits indicate colours that were the closest to red. Their ?E* values, which were the levelling property indicators of the leather, were 0.56 and 0.13, respectively, showing superior characteristics compared to the other two dyes. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and apparatus - Process of leather manufacturing and extraction of natural dyes - Measuring of physical properties - RESULTS AND DISCUSSION : pH change with natural dye content - Effect of dyeing time on colour - Effect of the concentration of natural dyes on colour En ligne : https://drive.google.com/file/d/1lYRs_tVWfcynfmT9IFH0GUGfzUE5c16R/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22646 [article]

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Properties of regenerated leather prepared using fibrous biomass / Chan-Wook Park in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 4 (07-08/2024)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 108, N° 4 (07-08/2024) . - p. 191-202 Titre : Properties of regenerated leather prepared using fibrous biomass Type de document : texte imprimé Auteurs : Chan-Wook Park, Auteur ; Young-Woo Kim, Auteur ; Sang Chul Lee, Auteur ; Eun-Chul Shin, Auteur ; Jae-Sik Seo, Auteur Année de publication : 2024 Article en page(s) : p. 191-202 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Champignons et constituants Collagène Cuir reconstitué Fibrilles de collagène La fibrille de collagène est une structure constituée d'un assemblage de fibres de tropocollagène (assemblage de 3 protéines de collagène alpha (alpha 1 - alpha 1 - alpha 2) en une hélice droite. Formulation (Génie chimique) kénaf et constituants Le Kenaf (Hibiscus Cannabinus L. et Hibiscus Sabdarifa L.), aussi appelé chanvre de Deccan, est une plante annuelle de la famille des Malvaceae. Le kenaf est apparenté au jute. Ces tiges épineuses d'1 à 2 cm de diamètre sont souvent, mais pas toujours ramifiée. Les feuilles de 10 à 15 cm de longueur sont de forme variable, celles de la base sont lobées et celles du sommet lancéolées. Les fleurs de 8 à 15 cm de diamètre sont blanches, jaunes ou pourpres. Le fruit est un capsule contenant plusieurs graines. Mesure Paille de riz Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The recycling of leather processing wastes and agricultural by-products is the most realistic alternative to address the causes of environmental pollution in conjunction with the aspect of resource recycling. Research has been actively conducted on the use of leather processing wastes for architectural interior materials, flooring materials, and regenerated leather. In the case of regenerated leather, it is attracting attention because its properties are different from those of natural leather and synthetic leather. Conversely, recycling research using waste mushroom media is still in the basic stage and remains at the level of simple recycling. In this study, we prepared regenerated leather samples using the following four raw materials in different mixing ratios and analyzed their properties : collagen fibre recovered from shaving scraps, kenaf fibre, rice straw fibre, and waste mushroom medium. The results of the physical property analysis show that the regenerated leather samples prepared with collagen fibre tend to have better tensile and tear strengths than those prepared with kenaf or rice straw fibre. Regarding the specific gravity of the material, the samples prepared with kenaf and rice straw fibres, which have porous structures, yielded poor results compared with the sample prepared with collagen fibre. In terms of softness, the sample prepared with animal-derived collagen fibre is superior compared with the samples prepared with plant-based kenaf and rice straw fibres. In conclusion, the regenerated leather samples prepared by mixing waste mushroom medium with collagen fibre exhibit superior properties compared with those of the samples prepared with kenaf or rice straw fibre. Note de contenu : - EXPERIMENTAL PROCEDURES : - Experimental materials - Manufacturing of regenerated leather - Measurements - RESULTS AND DISCUSSION : - Analysis of surface characteristics based on the type of natural fibre and the mixing included proportion of waste mushroom medium - Analysis of mechanical properties based on the type of natural fibre and the mixing proportion of waste mushroom medium - Analysis of specific gravity and softness based on the type of natural fibre and mixing proportion of waste mushroom medium - Table 1 : Properties of the materials used - Table 2 : Formulation of samples according to different fibre types - Table 3 : Surface characteristics based on the mixing ratio of natural fibre and waste mushroom medium En ligne : https://drive.google.com/file/d/1WsMNHMF1PsvBbKhE-LENIlgIQmm9_iTR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41406 [article]

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