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Thermochromism for smart leathers / Vairaperumal Tamilmani in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 6 (06/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 6 (06/2015) . - p. 161-164 Titre : Thermochromism for smart leathers Type de document : texte imprimé Auteurs : Vairaperumal Tamilmani, Auteur ; Dimple Kanadasan, Auteur ; R. Muthazhagan, Auteur ; Kalarical Janardhanan Sreeram, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2015 Article en page(s) : p. 161-164 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir Cuirs et peaux -- Finition Formulation (Génie chimique) Matériaux intelligents Pigments inorganiques Thermochromie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The Leather industry globally is poised for enhancing the unit value realization. With availability of raw material remaining more or less constant, conferring customer desired smart properties to leather enhances the value of leather. It is also quite pos-sible that such new features would enable leather to enter unexplored territories such as those envisaged for smarter textiles. An innovation in visual stimulus creates immediate appeal and utility, leading to consumer perception of owning it. A survey of such stimulus-based innovations of immediate appeal to people indicated a preference to thermochromism – a reversible color change influenced by temperature. While such applications are predominantly associated with sensor applications, the same as a concept for leather has not yet emerged. This paper reports synthesis of a rare earth doped transition metal complex that had a color shift from pale pink to dark green in the temperature range of 200 – 210°C. This colorant could be applied through con-ventional finishing techniques on leather and is envisaged to have applications in safety products such as heat resistant gloves. Note de contenu : - EXPERIMENTAL : Materials and methods - Synthesis of the complex - Product characterization - Application trials - RESULTS AND DISCUSSION : Application of thermochromic pigment in finishing of leather En ligne : https://drive.google.com/file/d/1irvOfoAyxdJ-pKNPiBFdmXlZ_agXAsej/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24230 [article]

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An assessment of differences between butt and belly regions of indian sheep skin / Dagnew Negasa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 6 (06/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 6 (06/2015) . - p. 165-176 Titre : An assessment of differences between butt and belly regions of indian sheep skin Type de document : texte imprimé Auteurs : Dagnew Negasa, Auteur ; Punitha Velmurugan, Auteur ; Kalarical Janardhanan Sreeram, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2015 Article en page(s) : p. 165-176 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux de moutons Peau -- Histologie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Skins and hides undergo changes in biochemical and biophysical properties during the leather processing. Biochemical composi-tion varies with respect to different portions of the skin like butt, belly, shank, and neck. Belly part looseness is the main problem in leather making from sheepskin. To address this issue, the present work focuses on analysis of histology and biochemical prop-erties of butt and belly portion of sheepskin from the southern part of India. Globular proteins are relatively higher in the butt portion than the belly, whereas it is reverse in the case of fibrous proteins except collagen. Interestingly, the presence of proteo-glycans content in butt regions is significantly high compared to belly and in case of fat content it is reverse. Acid soluble colla-gen contribution is higher in butt region than belly and vice-versa in the case of pepsin soluble collagen. In general, collagen con-tent is significantly higher in butt than belly, which may be the major cause for the higher strength characteristics of butt regions. Cr2O3 content is higher in butt region than belly, which corroborates with protein content and its interaction with tanning agents. Distribution of pore size influences the breathability property of leather, which has been altered in all the unit operations. Scan-ning electron microscopy study reveals the morphology of the grain and cross-section of the skin changes during leather pro-cessing. Thus, this study aids in better understanding of the butt and belly regions of Indian sheepskin. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - Non-collagenous proteins analysis - Fat content and chromic oxide content analysis - Thermal stability determination and pore size distribution - Collagen extraction and analysis - Conformational analysis - Scanning electron microscopic analysis - Histological examination - RESULTS AND DISCUSSION : Non-collagenous protein analysis - Fat content analysis - Thermal stability - Pore size distribution - Chromic oxide content analysis - Determination of collagen content - Scanning electron analysis - Histological examination En ligne : https://drive.google.com/file/d/193mZgED0wKCjT-NWI09j55OhjbuB5McX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24231 [article]

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Studies on solubilized sulfur dyes for coloring leather / R. Venba in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 6 (06/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 6 (06/2015) . - p. 177-185 Titre : Studies on solubilized sulfur dyes for coloring leather Type de document : texte imprimé Auteurs : R. Venba, Auteur ; Malathy Jawahar, Auteur ; G. Jothi, Auteur ; D. Dakshinamoorthy, Auteur ; A. Deepika, Auteur ; Chandra Babu Narasimhan Kannan, Auteur ; K. N. Ramesh, Auteur Année de publication : 2015 Article en page(s) : p. 177-185 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorants Cuirs et peaux -- Teinture Evaluation visuelle Solidité de la couleur Solutions (chimie) Soufre Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Cow wet blue stock was colored with solubilized sulfur dyes in a systematic study to unravel the color yield quality of dyeing and fastness of the dyes. These dyes penetrated the leather cross-section well and this performance resulted in a beneficial tone-in-tone dyeing, which means that the color of the grain, flesh and cross section of leather was almost the same tone. The levelness and uniformity of dyeing were excellent. Their fastness performance was generally very good. The resultant shades suggested that the sulfur dyes were best suited for light, pastel and medium shades, which require a high degree of levelness, penetration and fastness properties. An intense shade resulted from offering the sulfur dyes ahead of the retanning and fatliquoring process steps with a trivial reduction in penetration through the leather cross section for all the ten dyes studied. These findings favor the profitable production of light, medium to dark dye shades on leathers. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - Leather application trials with sulfur dyes - Study on the fastness characteristics of the dyed leathers - Study on the effect of process parameters on color intensity - RESULTS AND DISCUSSIONS : Study on the solution characteristics - Visual assessment of the dyeing characteristics of sulfur dyes - Fastness characteristics of full chrome cow leathers dyes with sulfur dye - Influence of process sequence variation on color strength En ligne : https://drive.google.com/file/d/1WYScwtMe3Km5iaxJPT9uO6xcuBYlAINi/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24232 [article]

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Identification and metabolic activities of bacterial species belonging to the enterobacteriaceae on salted cattle hides and sheep skins in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 6 (06/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 6 (06/2015) . - p. 186-199 Titre : Identification and metabolic activities of bacterial species belonging to the enterobacteriaceae on salted cattle hides and sheep skins Type de document : texte imprimé Année de publication : 2015 Article en page(s) : p. 186-199 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bactéries -- Identification Cuirs et peaux -- Analyse Cuirs et peaux de bovins Cuirs et peaux de moutons Entérobactériacées Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The detailed examination of the Enterobacteriaceae on salted hides and skins offers important information to assess faecal con-tamination of salted hides and skins, its roles in hide spoilage, and efficiency of hide preservation. Hence, salted cattle hide and skin samples were obtained from different countries and examined. Total counts of Gram-negative bacteria on hide and skin samples, respectively, were 104-106 and 105-106 CFU/g; of Enterobacteriaceae 104-105 and 105-106 CFU/g; of proteolytic Enter-obacteriaceae 103-105 and 105-106 CFU/g; of lipolytic Enterobacteriaceae 102-105 and 104-105 CFU/g; and of each species be-longing to Enterobacteriaceae 102-105 and 103-105 CFU/g. Moisture contents of the hide (between 17% - 29%) and skin samples (between 18% - 39%) were low, and salt saturations of most hide and skin samples were fairly high (100%), but these microor-ganisms were isolated from the samples in high numbers. Although 16 bacterial species belonging to genera of Cedecea, Enterobacter, Escherichia, Ewingella, Klebsiella, Proteus, Raoultella, Serratia and Yersinia were isolated from the hide sam-ples, 16 bacterial species belonging to genera of Citrobacter, Enterobacter, Escherichia, Klebsiella, Proteus, Raoultella, Serra-tia and Yersinia were isolated from the skin samples. These species were identified using API® 20E Test Kits. Although Cede-cea lapagei, Serratia rubidaea and Yersinia enterocolitica were the most prevalent microorganisms on the hide samples, Esche-richia coli, Serratia rubidaea and Serratia plymuthica were the most prevalent bacterial isolates on the skins. The most com-mon bacterial species isolated from both hides and skins was Serratia rubidaea. The presence of the members of Enterobacteri-aceae on the hides and skin samples in high numbers was evidence of faecal contamination and inadequate preservation. Ac-cording to biochemical test results, isolates exhibited catabolic activity to break down carbohydrate, lipid and protein which may adversely affect leather quality. Hide and skin samples contain different species of Enterobacteriaceae which may cause deterioration of hides and skins; therefore, effective antibacterial applications should be applied to hides and skins to eradicate these microorganisms and prevent substantial economical losses in leather industry. Note de contenu : - EXPERIMENTAL : Cattle hide and sheep skin samples - Determination of pH values of the hide and skin samples - Determination of salt saturation, moisture and ash content of the hide and skin samples - Determination of total counts of gram-negative bacteria and the enterobacteriaceae on the hide and skin samples - Isolation and identification of the members of enterobacteriaceae from the hide and skin samples - Determination of protease activity of the isolates - Determination of lipase activity of the isolates - Determination of oxidase activities of the isolates - Determination of catalase activity of the isolates En ligne : https://drive.google.com/file/d/1fVjG6QB3ARYw1HPDB02bcaanzrRIsGJT/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24233 [article]

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