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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A study on characteristics of lightweight split leather using foam technology / Eun-Chul Shin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 2 (03-04/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 2 (03-04/2023) . - p. 49-54 Titre : A study on characteristics of lightweight split leather using foam technology Type de document : texte imprimé Auteurs : Eun-Chul Shin, Auteur ; Young-Woo Kim, Auteur ; Won-Ki Lee, Auteur Année de publication : 2023 Article en page(s) : p. 49-54 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymères Cuirs et peaux Fixation (chimie) Matériaux expansés Microcapsules Moussage (chimie) Pénétration (physique) Polyacryliques Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Natural leather is traditionally a high-quality material that is widely used for vehicle interior materials (e.g., automobiles, trains and airplanes) and fashion items (e.g., handbags, shoes and gloves). However, it is heavier than materials such as various fibres and synthetic leather, which makes it unsuitable for modern applications that prioritise lightness, portability and fuel efficiency. In addition, animal skins used as raw materials are structured with collagen protein, which limits the ability to ability to reduce the weight by altering the thickness and chemicals used in its preparation. In this study, we investigated the penetration, fixation, and foaming methods of thermally expandable microcapsules (TEM) in leather manufacturing procedures to reduce the weight of natural leather. Dyeing and fatliquoring were suitable processes for applying TEM to leather, and the combined use of acryl polymers enabled TEM to attach efficiently to the leather tissue. The manufacture of foamed leather under conditions of 20% TEM and 3% fixing agent resulted in an increase in the thickness by >20% and enabled the production of foamed leather with excellent physical properties. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Apparatus - Process of leather manufacturing and measuring of physical properties - Measurements - RESULTS AND DISCUSSION : TEM application experiments for each leather - TEM content-specific application experiments in dyeing/fatliquoring processes manufacturing procedure - Foaming characteristics with time - Fixing agent application experiments - Table 1 : Characteristics of chemicals - Table 2 : Expansion ratio according to leather process En ligne : https://drive.google.com/file/d/1vj_BfNFpV9Ndk1h5_K2xhj5V36BwyZy3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39062 [article]

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A study on characteristics of low-density regenerated leather using chromium-tanned shaving waste / Eun-Chul Shin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 2 (03-04/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 2 (03-04/2023) . - p. 43-48 Titre : A study on characteristics of low-density regenerated leather using chromium-tanned shaving waste Type de document : texte imprimé Auteurs : Eun-Chul Shin, Auteur ; Young-Woo Kim, Auteur ; Won-Ki Lee, Auteur Année de publication : 2023 Article en page(s) : p. 43-48 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir reconstitué Cuirs et peaux -- Déchets -- Recyclage Dérayage Matériaux expansés Microsphères Moussage (chimie) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Shaving scrap is collagen fibre, that is the leather waste occurring during thickness adjustment during the natural leather manufacturing process, and may cause problems such as environmental contamination because of the chromium (Cr) contained when it comes to reclaiming processes. Various studies applying to shaving scrap are currently being conducted in many countries across the world with an initiative by the EU. Amongst those applications, the regenerated leather is being highlighted as a substitute for natural leather. However, since the regenerated leather uses latex as a binder, it accordingly entails a high weight, which is deemed as a disadvantage due to its dense internal tissues compared to other synthetic leathers. To address such disadvantages, this study employed the thermally expandable microspheres (TEMs) to improve its density and light weight by alleviating the internal structure. This is a study on the manufacturing of foamed regenerated leather using shaving scraps. In the study, the shaving scraps were forced to foam at under 100~120°C with consideration for the heat resistance of collagen fibre after applying the thermally expandable microsphere, and then the effect was analysed. In the analysis results, the most effective foaming rate was exhibited when the shaving scraps were treated at under 110°C for 8 minutes using TEMs T110. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Manufacture of regenerated leather - Measurements - RESULTS AND DISCUSSION : Optimisation of foaming conditions - Foaming studies by microsphere content - Table 1 : Microsphere used in this study - Table 2 : SEM images of foaming conditions - Table 3 : Physical properties according to content of microsphere - Table 4 : WVP* and density according to content of microsphere En ligne : https://drive.google.com/file/d/11Uz81wHKO5x9AAvLwpedwpNOepWJST2F/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39063 [article]

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Study on possibility of oil migration according to fatliquoring agent characteristics / Jae-Hyung Park in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 5 (09-10/2018)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 5 (09-10/2018) . - p. 247-250 Titre : Study on possibility of oil migration according to fatliquoring agent characteristics Type de document : texte imprimé Auteurs : Jae-Hyung Park, Auteur ; Young-Woo Kim, Auteur ; Won Ju Kim, Auteur ; In-Kye Paik, Auteur ; Eun-Ji Kim, Auteur ; Hyun-Dae Cho, Auteur ; Hyung-Joon Youn, Auteur ; Han-Do Kim, Auteur ; Eun-Chul Shin, Auteur Année de publication : 2018 Article en page(s) : p. 247-250 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir dans les automobiles Cuirs et peaux -- Analyse Cuirs et peaux -- Détérioration Fourier, Spectroscopie infrarouge à transformée de Huiles et graisses Hydrolyse Produits chimiques -- Migration Produits de nourriture du cuir Réflexion totale atténuée Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The natural leather used for car interior materials is a traditional and high-quality material that can be applied to diverse purposes such as the steering wheel, knob, seat and internal trim. However, continuous friction and sweat from the driver causes the hydrolysis of high-molecular resins and the painted surfaces weakened under the high-temperature conditions of the car interior often lead to slipperiness and increased lustre owning to the migration of the fatliquoring agent. Thus, this study investigated the bonding between the leather and different types of fatliquoring agent, and their influence on oil migration by facilitating ageing (hydrolisis). The results revealed that the silicon- and lecithin-based fatliquoring agents had a significant influence on oil migration owning to the low bonding to the leather under the ageing condition. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and apparatus - Process of leather manufacturing and measuring of physical properties - RESULTS AND DISCUSSION : Fat content in leather - Oil migration after hydrolisis - Attenuated total reflection-Fourier transform infrared characterisation of oil migration - Table 1 : Characteristics of fatliquoring agent - Table 2 : Process for fatliquoring with chrome-tanned steer hide leather - Table 3 : Extraction solvents of fat in leather - Table 4 : Oil contents of leather sample treatment with fatliquoring agent according to extraction solvents - Table 5 : The results of monitoring of the oil migration on each specimen - Table 6 : Oil absorption film after oil migration - Table 7 : Main component of migration oil En ligne : https://drive.google.com/file/d/1R2nzOqKwZm8GXwa9AsqB8OCMZcyvdHUp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31108 [article]

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