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A novel approach for enhanced color intensity and uniformity in leather dyeing / Sujata Mandal in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 6 (06/2018)
[article]
Titre : A novel approach for enhanced color intensity and uniformity in leather dyeing Type de document : texte imprimé Auteurs : Sujata Mandal, Auteur ; Jayanthi Durga, Auteur ; G. Jothi, Auteur ; Malathy Jawahar, Auteur ; Chellappa Muralidharan, Auteur Année de publication : 2018 Article en page(s) : p. 176-182 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale
Cuirs et peaux -- Teinture
Photostabilité
Résistance à l'abrasion
Résistance à la transpiration
Résistance aux frottements humides
Solidité de la couleurIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Dyeing is a significant process step in leather making that is carried out to enhance the aesthetics of the tanned hides and skins. Due to the heterogeneous nature of the skin matrix, obtaining leathers with consistent color is challenging. The present study describes application of hydrotalcite-like inorganic synthetic material (HTLM) during leather dyeing to bring color uniformity among leathers by maximizing the color intensity within the skin and among the skins processed in a batch. The HTLM has been used in an interim step between two phases of dyeing that enhanced shade intensity as well as color consistency through modification of the leather surface chemically. The efficacy of the HTLM for enhanced color intensity and uniformity in leather has been investigated. Influence of the HTLM on the physicals characteristics like, perspiration, color fastness to light and dry/wet rub are also studied. Note de contenu : - Materials
- Methods
- Color fastness testing. Fastness to dry and wet rub
- Fastness to light
- Perspiration
- Spectroscopic assessment of color intensity and uniformity
- Characterization of the HTLMEn ligne : https://drive.google.com/file/d/1CDZaPfJCQjnefo3Te9Sro4NC9GcEbmFv/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30686
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 6 (06/2018) . - p. 176-182[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19986 - Périodique Bibliothèque principale Documentaires Disponible Rapid fiber opening process for skins : an approach for fail-safe chemical-free process / Jayanthi Durga in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 1 (01/2015)
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Titre : Rapid fiber opening process for skins : an approach for fail-safe chemical-free process Type de document : texte imprimé Auteurs : Jayanthi Durga, Auteur ; Ammasi Ranjithkumar, Auteur ; Ramakrishnan Ramesh, Auteur ; Chellan Rose, Auteur ; Chellappa Muralidharan, Auteur Année de publication : 2015 Article en page(s) : p. 7-12 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbohydrases
Cuirs et peaux -- Analyse
Cuirs et peaux de chèvres
Epilage enzymatique
Travail de rivière (cuir)
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Conventional beamhouse operations adopted by the global tanning industry are coming under the close scrutiny of the environmentalists on account of the possible adverse effect on human health and environment. Lime, which is used to the tune of about 10% on the weight of the raw hides and skins, in re-liming stage contribute to generation of large quantities of sludge, the disposal of which is a serious concern. Also the process duration to achieve the required fiber opening in the re-liming process is very long, ranging from 24-72 hrs for different substrates and end products. Enzyme based beamhouse processes are being advocated to overcome the problems associated with the conventional processes. However, enzyme based methods need greater control over process parameters to achieve satisfactory results in leather processing and avoid damage to the pelt. To overcome the problems associated with the conventional re-liming process, an attempt has been made in the present investigation to utilize cocktail of carbohydrases for fiber opening of hides and skins. Fiber opening at optimized concentration of the above enzyme has been studied for its efficiency on goatskins. A process using optimum quantity of enzyme led to fiber opening in 30 minutes. The efficacy of enzyme on rapid fiber opening of dehaired skin was studied at different experimental conditions of pH, time and enzyme concentration. The performance of the enzyme in the given experimental conditions was assessed by quantifying the removal of carbohydrate and proteoglycan and examining the fiber opening by scanning electron microscopic studies. Effect of enzyme on the final quality of the leather was evaluated by changes in chemical characteristics, physical properties and visual examination. Note de contenu : - EXPERIMENTAL : Optimization of enzyme concentration - pH optimization - Time course study - Carbohydrate assay - Estimation of proteoglycan - Scanning electron microscopic analysis - Physical testing and visual assessment
- RESULTS AND DISCUSSION : Effect of enzyme concentration of fiber opening - Effect of pH on fiber opening - Effect of time on fiber opening - Chromium content of wet blue leather - Scanning electron micrography - Physical and organoleptic propertiesEn ligne : https://drive.google.com/file/d/1exmz-jTGm0C0NTh0WpzBYlQtS-Ni_g4y/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22791
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 1 (01/2015) . - p. 7-12[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16774 - Périodique Bibliothèque principale Documentaires Disponible Studies on alkaline protease from bacillus crolab MTCC 5468 for applications in leather making / Ammasi Ranjithkumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 7 (07/2017)
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Titre : Studies on alkaline protease from bacillus crolab MTCC 5468 for applications in leather making Type de document : texte imprimé Auteurs : Ammasi Ranjithkumar, Auteur ; Jayanthi Durga, Auteur ; Ramakrishnan Ramesh, Auteur ; Victor John Sundar, Auteur ; Chellan Rose, Auteur ; Chellappa Muralidharan, Auteur Année de publication : 2017 Article en page(s) : p. 232-239 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Confitage Le confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse.
Cuirs et peaux -- Analyse
Cuirs et peaux de chèvres
Enzymes microbiennes
PeptidasesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Bating has become an indispensable operation of leather making to obtain good quality leather. Alkaline proteases are commonly used in leather manufacture in the process of unhairing and bating of hides/skins. In this study, experiments were carried out to test the bating efficacy of a new alkaline protease obtained from Bacillus crolab MTCC 5468 and compared with commercial bate. Impact of alkaline protease on porosity of enzymatically and conventionally unhaired goat skins, have been compared. New enzyme treated pelt was free from scud and pigments, with fine, clean, white, silkier grain and pliable. The result was superior to that of commercial bate treated pelts. The pore size/distribution and water vapor permeability was better than commercial bate and conventionally unhaired skins. Scanning electron microscopy and histological analysis of pelt obtained from new alkaline protease based process reveals complete removal of scud and better opening up of collagen fibers. Moreover, the collagen was not damaged and resulted in good quality of leather. The physio- chemical studies conclusively show that among the experiments, the skins unhaired with new alkaline protease was better in comfort properties than the conventionally unhaired skins as inferred by porosity measurements. Using new alkaline protease for bating led to better results than commercial bate. The study indicates improved efficiency of bacterial alkaline protease in leather processing for beam house applications. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - Qualitative analysis for efficiency of bating - Analysis of unhairing and bating spent liquor - Chrome liquor analysis - Water vapor permeability measurement - Capillary flow porometry analysis - Histological analysis - Scanning electron microscopic analysis - Shrinkage temperature of the wet blue leathers - Physical and organoleptic properties of leather
- RESULTS AND DISCUSSION : Qualitative analysis of bating - Protein content in unhairing and bating spent liquors - Water vapor permeability - Capillary flow porometry analysis - Scanning electron micrograph analysis - Histological analysis - Physical and organoleptic properties of leather - chrome contentEn ligne : https://drive.google.com/file/d/1Quyk6d9iv6UdGf9haqVeQgtytIIUdeo1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28821
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 7 (07/2017) . - p. 232-239[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19155 - Périodique Bibliothèque principale Documentaires Disponible