Comparison of the effect of the tropical test on both chrome-tanned and wet-white upholstery leather / Lluis Ollé in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 3 (05-06/2011)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 95, N° 3 (05-06/2011) . - p. 109-115 Titre : Comparison of the effect of the tropical test on both chrome-tanned and wet-white upholstery leather Type de document : texte imprimé Auteurs : Lluis Ollé, Auteur ; M. Jorba, Auteur ; Joaquim Font, Auteur ; Anna Bacardit, Auteur Année de publication : 2011 Article en page(s) : p. 109-115 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir -- Effet du rayonnement ultraviolet Cuir -- Effets du climat Cuir dans les automobiles Cuirs et peaux -- Biodégradation Cuirs et peaux -- Détérioration Cuirs et peaux -- Effets de la température Tannage au chrome Wet-white (tannage) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Automotive upholstery leather can undergo extreme environmental that may cause premature ageing. Leather is strongly affected by three main environmental parameters : temperature relative humidity and UV radiation. UV radiation causes colour change, fading, surface erosion, loss of gloss, etc. Increasing the levels of UV radiation represents a primary accelerating factor for leather ageing. Temperature produces thermal oxidation degradations, subsequent reaction rates and acceleration of other weathering reactions. Relative humidity acts as a chemical reagent in many hydrolytic weathering reactions and as a physical stressor of leather Additionally, when relative humidity is over 65 % leather is susceptible to mould attack. The aim of this work is to compare the effect of the tropical environment exposure on both chrome-tanned and wet-white upholstery leather. Note de contenu : EXPERIMENTAL PROCEDURES : Materials - Methodology - Evaluation of sample RESULTS AND DISCUSSION : Physical degradation due to tropical environment - Chemical degradation due to tropical environment exposure - Biological degradation due to tropical environment exposure En ligne : https://drive.google.com/file/d/1dVABD2ajwZLkKZhcZk-UDFe5fxS3dXfL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11879 [article]

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Effect of temperature, relative humidity and UV radiation on wet-bright leather ageing / Anna Bacardit in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 5 (09-10/2017)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 5 (09-10/2017) . - p. 231-236 Titre : Effect of temperature, relative humidity and UV radiation on wet-bright leather ageing Type de document : texte imprimé Auteurs : Anna Bacardit, Auteur ; Teresa Mir, Auteur ; Joaquim Font, Auteur ; Rosa M. Cuadros, Auteur ; Lluis Ollé, Auteur Année de publication : 2017 Article en page(s) : p. 231-236 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Air -- Humidité Cuir -- Effet du rayonnement ultraviolet Cuirs et peaux -- Détérioration Cuirs et peaux -- Effets de la température Wet-bright (tannage) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Since leather is strongly affected by three main environmental parameters — temperature, relative humidity, and UV radiation — this study focuses on the effect that these three factors have on wet-bright leather ageing. Wet-bright leathers were exposed to weathering affects in a climatic chamber to 1) try and Identity the major variables affecting this weathering process; and 2) check for any possible interactions among these variables. Both a multilevel centralized factorial experimental design and an analysis of variance (ANOVA) were used as statistical tools for estimating the effects of the parameters. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Methodology - Evaluation - RESULTS AND DISCUSSION : Effect of weathering variables on physical and fastness properties of leather - Effect of weathering variables in the modification of leather composition - Changes in fibrous structure En ligne : https://drive.google.com/file/d/1q_wF3pgQIsq4VOHVp10sPcky7RefuI6C/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29237 [article]

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Leather ageing and hexavalent chromium formation as a function of the fatliquoring agent. Part I : chrome tanned leathers / Ramón Palop in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 5 (09-10/2008)

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 5 (09-10/2008) . - p. 200-204 Titre : Leather ageing and hexavalent chromium formation as a function of the fatliquoring agent. Part I : chrome tanned leathers Type de document : texte imprimé Auteurs : Ramón Palop, Auteur ; Joan Parareda, Auteur ; Olga Ballùs, Auteur ; Agusti Marsal, Auteur Année de publication : 2008 Article en page(s) : p. 200-204 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir -- Effet du rayonnement ultraviolet Cuir -- Teneur en chrome hexavalent Cuirs et peaux -- Détérioration Cuirs et peaux -- Effets de la température Essais (technologie) Jaunissement (défaut) Produits de nourriture du cuir Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The aim of this work was to evaluate the influence of eighteen different types of fatliquoring agents on leather ageing. Temperature and ultraviolet light tests were conducted separately. The existence of a direct relationship between leather yellowing, diminution of shrinkage temperature, autoflammability and odour was confirmed. There was also a non-linear relationship between the above parameters and the iodine index of the fatliquoring agents. Hexavalent chromium was not formed when temperature tests were applied on neutralised and fatliquored leathers. The possible physicochemical mechanisms for this phenomenon are discussed. The temperature test exerted greater influence than the ultraviolet light tests on the aforementioned parameters. Note de contenu : - AIM OF THE WORK - EXPERIMENTAL PROCEDURES : Materials and methods - Evaluation of the treated samples - RESULTS AND DISCUSSION : Effect of temperature - Relationship between iodine number an the parameter evaluated - Table 1 : Process details - Table 2 : Fatliquoring agents used with their iodine index - Fig. 1 : Influence of temperature on yellowing - Fig. 2 : Influence of temperature on shrinkage temperature - Fig. 3 : Yellowing and detanning mechanisms - Fig. 4 : Plot of shrinkage temperature versus quantity of fixed chromium - Fig. 5 : Influence of temperature on denaturing temperature - Fig. 6 : Influence of temperature on odour - Fig. 7 : Influence of temperature on surface area variation - Fig. 8 : Influence of ultraviolet light on yellowing - Fig. 9 : Influence of ultraviolet light on shrinkage temperature Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35251 [article]

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Leather ageing and hexavalent chromium formation as a function of the fatliquoring agent. Part II : Chrome retanned leathers / Ramón Palop in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 6 (11-12/2008)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 6 (11-12/2008) . - p. 237-239 Titre : Leather ageing and hexavalent chromium formation as a function of the fatliquoring agent. Part II : Chrome retanned leathers Type de document : texte imprimé Auteurs : Ramón Palop, Auteur ; Joan Parareda, Auteur ; Olga Ballùs, Auteur ; Agusti Marsal, Auteur Année de publication : 2008 Article en page(s) : p. 237-239 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chrome hexavalent Cuir -- Effet du rayonnement ultraviolet Cuirs et peaux -- Détérioration Cuirs et peaux -- Effets de la température Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Produits de nourriture du cuir Retannage Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this second part, we assessed the influence of a chromium retanning process applied to wet-blue hides fatliquored with eighteen different fatliquoring agents on yellowing, detanning and Cr(VI) formation after exposure to the separate effects of temperature and ultraviolet light. The results obtained for chromium retanned leathers are compared with those of non-retanned leathers in Part I. The temperature test gave rise to less yellowing in chromium-retanned leathers than in non-retanned leathers. As for shrinkage temperature, there were no linear variations although a tendency to lower shrinkage in the retanned samples was observed. Amounts of hexavalent chromium varied as a function of the fatliquor type. It may be concluded that the oxidised chromium present resulted from residual or weakly fixed chromium from the retanning process. Regarding fastness to ultraviolet light, both yellowing and shrinkage temperature reduction were lower in chromium retanned leathers. Eight fatliquoring agents were selected in line with the results obtained. Their behaviour with respect to physical and organoleptic properties was compared with that of a sulphated triglyceride used as reference. The most suitable fatliquoring agents were suggested for four different leather articles. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials and methods - Evaluation of the treated samples - RESULTS AND DISCUSSION : Effect of temperature - Effect of light - BEHAVIOUR OF SELECTED FATLIQUORING AGENTS V. PHYSICAL AND ORGANOLEPTIC PROPERTIES : Comparison with a standard process - Results - CONCLUSIONS : Selection of fatliquoring agents for different leather articles - Table 1 : Process details - Table 2 : Fatliquoring agents used with their iodine index - Table 3 : Variation of the properties (%Δ) compared with the reference except fogging, which refers to the absolute values for each fatliquoring agent En ligne : https://drive.google.com/file/d/1U17gAnTjeWUhI1pnG6jm0c0MEj4I70j9/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38991 [article]

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Study of the effect of temperature, relative humidity and UV radiation on chrome-tanned leather ageing / Anna Bacardit in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 6 (06/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 6 (06/2012) . - p. 179-185 Titre : Study of the effect of temperature, relative humidity and UV radiation on chrome-tanned leather ageing Type de document : texte imprimé Auteurs : Anna Bacardit, Auteur ; Montse Jorba, Auteur ; Joaquim Font, Auteur Année de publication : 2012 Article en page(s) : p. 179-185 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Effet du rayonnement ultraviolet Cuirs et peaux -- Détérioration Cuirs et peaux -- Effets de l'humidité Cuirs et peaux -- Effets de la température Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Since leather is strongly affected by three main environmental parameters: temperature, relative humidity and UV radiation, this piece of research focuses on the effect that these three factors have on chrome-tanned leather ageing. Chrome tanned leathers were exposed to weathering effects in a climatic chamber in order to identify the most important variables affecting this weathering process and also to check for any possible interactions. Both a multilevel centralized factorial experimental design and an analysis of variance (ANOVA) were used as statistical tools for estimating the effects of the parameters. Note de contenu : - Effect of the weathering variables on physical and fastness properties of the leather - Effect of the weathering variables in the modification of the leather composition - Changes in fibrous structure En ligne : https://drive.google.com/file/d/1JQiJtykQcD3JHLq9wDi0eIFYbIbzpT3v/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15468 [article]

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