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Auteur Jonnalagadda Raghava Rao
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Central Leather Research Institute - Adyar - Chennai - India
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Fish skin and exotic leathers / Jaya Prakash Alla in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 2 (02/2017)
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Titre : Fish skin and exotic leathers Type de document : texte imprimé Auteurs : Jaya Prakash Alla, Auteur ; Giriprasath Ramanathan, Auteur ; Nishad Fathima Nishter, Auteur ; Tirichurapalli Sivagnanam, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2017 Article en page(s) : p. 36-43 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Teinture
Cuirs et peaux de Poissons
Cuirs exotiques
EosineL'éosine est un colorant de couleur orange-rosé aux propriétés asséchantes et antiseptiques.
Il existe deux composés appelés par ce nom, interchangeables dans leur utilisation : 1. l'éosine Y (éosine tirant sur le jaune) ou tétrabromofluorescéine, dérivé tetrabromé de la fluorescéine ; 2. l'éosine B (éosine tirant sur le bleu) en est un dérivé dibromo dinitro.
L'éosine est obtenue à partir d'anhydride phtalique et de résorcinol qui sont généralement produits à partir du goudron recueilli lors de la distillation de la houille au cours de la fabrication du coke.
Gants
Hématoxyline
Morphologie (matériaux)
Tannage au chrome
Uronique, AcideLes acides uroniques sont des composés chimiques obtenus par oxydation du dernier carbone des oses simples (ose acide). Ils entrent dans la composition des glycosaminoglycannes, constituants essentiels des matrices extracellulaires.
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Exotic leathers are favoured due to their appearance, unique natural pattern and strength properties. The use of exotic leathers from different animal sources has increased the demand in the leather market for various applications. Processing of these skins require a non-conventional approach in order to preserve the natural characteristics of the skin after converting into leather. The present work exploits a new raw material source for its utilization as exotic leather. An exceptional variety of star puffer fish was keyed out from Indian Ocean coast. Leather made out of this skin was unique from most of the exotic leathers. Unlike other fishes, skin surface morphology of this species is covered with calcified spines. These spines are aligned on dorsal and ventral sides. When they are converted into leather, spines get firmly anchored onto collagen matrix like caltrops. Scanning Electron Microscopy (SEM) served as a tool to relate structural morphology of the leather and spine composition was analyzed using Energy-Dispersive X-ray spectroscopy (EDX). The developed exotic leather exhibited better mechanical properties and finds application in making high grip articles, therapeutic footwear and other niche products. Note de contenu : - EXPERIMENTAL SECTION : Materials - Leather processing - Hexosamine and uronic acid estimation - Analysis wet blue leather - H&E staining - SEM and EDX analysis - 2.7 physical testing and organoleptic properties
- RESULTS AND DISCUSSION : Surface morphology of A. Stellatus fish skin - Leather processing - Hexosamine and uronic acid estimation - Hematoxylin and eosin staining - Chrome tanning and analysis of wet blue leather - SEM and EDX analysis - Physical properties and organoleptic properties - Preparation of gloves using fish skinEn ligne : https://drive.google.com/file/d/1n1yzWh8W4SEnnvXYyT0kus8s9ruSzJdm/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27883
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Code-barres Cote Support Localisation Section Disponibilité 18697 - Périodique Bibliothèque principale Documentaires Disponible Glove leather manufacture from sheepskins : influence of fatliquors and syntans on the gloving properties / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 5 (05/2008)
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Titre : Glove leather manufacture from sheepskins : influence of fatliquors and syntans on the gloving properties Type de document : texte imprimé Auteurs : Balaraman Madhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; S. Sadulla, Auteur ; Swarna Vinodh Kanth, Auteur ; Rathinam Aravindhan, Auteur ; G. Balaji, Auteur Année de publication : 2008 Article en page(s) : p. 182 - 190 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The post tanning auxiliaries like syntans and fatliquors are known to significantly influence the properties of glove leathers. The right choice of fatliquors and syntans is critical to obtain the leathers with good gloving property. Hence, in the present work an attempt has been made to study systematically the influence of various fatliquors and syntans on the gloving properties of leather made from sheep skins. Combinations of six different types of fatliquors and four syntans have been studied for their influence on the gloving properties viz., run, softness, strength properties and other subjective properties like smoothness and stretch. It is observed that the combination of fatliquors based on sulfited fish oil, sulfochlorinated paraffin wax and lecithin along with glutaraldehyde and polymeric retanning agents result in leathers with better gloving characteristics. En ligne : https://drive.google.com/file/d/1SbWduKdKigMOHOQZruYLGlD_LvfszrUl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2565
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Code-barres Cote Support Localisation Section Disponibilité 010088 - Périodique Bibliothèque principale Documentaires Disponible Green chemistry approach in leather processing : a case of chrome tanning / Marimuthu Pradeep Kumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 4 (04/2011)
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Titre : Green chemistry approach in leather processing : a case of chrome tanning Type de document : texte imprimé Auteurs : Marimuthu Pradeep Kumar, Auteur ; Rathinam Aravindhan, Auteur ; Kalarical Janardhanan Sreeram, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2011 Article en page(s) : p. 113-120 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie écologique
EthanolamineL'éthanolamine, également appelée 2-aminoéthanol ou monoéthanolamine, est un composé chimique organique qui est à la fois une amine primaire (par son groupe amine) et un alcool primaire (par son groupe hydroxyle). À l'instar des autres amines, la monoéthanolamine se comporte en base faible. L'éthanolamine est un liquide toxique, inflammable, corrosif, incolore et visqueux ; son odeur est similaire à celle de l'ammoniac.
Liqueurs de tannage
PicklageLe picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu.
Tannage au chromeIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The leather industry, world over, has adopted several new practices as a part of their green initiative. In this study the chrome tanning process, one of the most important steps in leather making, was evaluated for its ‘greenness’. The prominent tool employed for assessing greenness for an industrial process, atom economy (the conversion efficiency of a chemical process in terms of all atoms involved) was studied for the first time for four types of chrome tanning processes: direct chrome liquor recycle (DCLR), ethanolamine-assisted, pickleless chrome tanning, and conventional chrome tanning. All chemicals involved in the reaction with skin protein were taken into consideration for the computation of overall atom economy. An atom economy of only 29% was obtained for the conventional chrome tanning system. Among the four improved methods of chrome tanning evaluated, the pickleless chrome tanning method provides the maximum atom economy of about 57% followed by ethanolamine and DCLR, having atom economies of 42 and 32%, respectively. Note de contenu : - EXPERIMENTAL METHODS : Materials and methods - Analysis of leather and spent liquors
- RESULTS AND DISCUSSION : Atom economy for conventional chrome tanning process - Atome economy of various chrome management systemsEn ligne : https://drive.google.com/file/d/1sXASKYo0y5hG3KXknuDDD0qwnOypMpdd/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11313
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Code-barres Cote Support Localisation Section Disponibilité 013045 - Périodique Bibliothèque principale Documentaires Disponible Green solution for salinity in tannery wastewater : a step forward in leather processing / Subramanian Saravanabhavan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 7 (07/2014)
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Titre : Green solution for salinity in tannery wastewater : a step forward in leather processing Type de document : texte imprimé Auteurs : Subramanian Saravanabhavan, Auteur ; Punitha Velmurugan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2014 Article en page(s) : p. 214-223 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chlorure de sodium Le chlorure de sodium est un composé chimique de formule NaCl. On l'appelle plus communément sel de table ou de cuisine, ou tout simplement sel dans le langage courant. C'est le principal produit dissous dans l'eau de mer ; on l'appelle alors sel marin.
On l'obtient : dans des marais salants par évaporation de l'eau de mer, dans des mines, par extraction du sel gemme (halite) ou en le synthétisant lors de réactions à hautes températures entre du dichlore (Cl2) et du sodium métallique (Na).
Le chlorure de sodium est utilisé dans l'industrie chimique pour produire du chlore, de la soude caustique et de l’hydrogène.
Cuirs et peaux -- Analyse
Cuirs et peaux -- Conservation
Eaux usées -- Epuration
Eaux usées -- Teneur en sels
Hydroxyproline
Polyéthylène glycolIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The conventional leather processing method contributes to high salinity in wastewater due to the discharge of enormous amount of salts used for preservation. Hence, an attempt has been made to replace the salt with polyethylene glycol (PEG) to reduce the salinity in tannery wastewater. The molecular weight (MW) and percentage offer of PEG were standardized based on the rate of dehydration of hide matrix during preservation and rehydration of preserved hide matrix. The determination of hydroxyproline in spent soak liquors at various time periods during storage showed that the preservation of hides using PEG MW 2000 was more effective than sodium chloride. The reduction in total salinity by 43% is possible in tannery wastewater through PEG based preservation of raw hides. Functional characteristics of the experimental crust leathers are shown to be on par with control crust leathers. The developed greener process appears to be technically viable and economically acceptable alternative for salt based preservation. Note de contenu : - MATERIALS AND METHODS : Materials - Selection of molecular weight of PEG for preservation - Optimization of percentage offer of PEG MW 2000 for preservation - Rehydration studies - Scanning electron microscopy analysis - Differential scanning calorimetry and Fourier Transform Infrared Studies - Determination of hydroxiproline - Bulk preservation studies - Soaking operation for preserved control and experimental cow hide from bulk trials - Input and output analysis - Spent soak liquor and composite liquor analysis - Physical testing and hand evaluation of leathers
- RESULTS AND DISCUSSION : Underlying principle for selecting PEG for preservation - Selection of MW of PEG for preservation - Optimization of percentage offer of PEB MW 2000 for preservation - Scanning electron microscopy analysis - Differential scanning calorimetry and Fourier Transform Infrared studies - Comparison of the effectiveness of preservation method based on PEG MW 2000 and salt - Bulk trial studies : an appraisal input and output analysis - Analysis of soak liquor and composite liquor - Physical and hand evaluation of leathers - Techno-economic benefitsEn ligne : https://drive.google.com/file/d/1pFPmWHEqtaw8kHjM75xB5oaEE2opjVZg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21706
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Code-barres Cote Support Localisation Section Disponibilité 16423 - Périodique Bibliothèque principale Documentaires Disponible Henna–aluminum combination tannage : a greener alternative tanning system / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 6 (06/2011)
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Titre : Henna–aluminum combination tannage : a greener alternative tanning system Type de document : texte imprimé Auteurs : A. E. Musa, Auteur ; Rathinam Aravindhan, Auteur ; Balaraman Madhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; B. Chandrasekaran, Auteur Année de publication : 2011 Article en page(s) : p. 190-199 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse
Sulfate d'aluminium
Tannage combinéLe tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique
Tannage minéralTannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium
Tannage végétalIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Development of cleaner technologies for leather manufacture is imperative for the sustenance of the tanning industry. In the present study, a combination tanning system based on a henna-aluminum tannage for the production of upper leathers as a cleaner alternative is presented. Extract from the leaves of widely distributed Lawsonia inerims (Henna) from Sudan has been evaluated for its tanning characteristics in a combination tanning system based on henna and aluminum sulfate. Aluminum-henna (Al-henna) leathers tanned using 2% Al2O3; followed by 20% henna resulted in shrinkage temperature above 95°C. The uptake of henna in henna-Al tanning system with henna (20%) followed by aluminum (2% Al2O3) has been found to be better than the tanning system of Al-henna. These leathers showed compact fibre structure, indicating that the tanning process did not bring about any major change or destruction on the fibre structure of the leathers. Surface colour values of henna-Al leathers resulted in darker shades with less red and more yellow components in the crust leathers. The combination tanning system provides significant reduction in the discharge of total dissolved solids in the wastewater. Henna-Al combination tanning system resulted in leathers with good organoleptic and strength properties. The work presented in this paper established the use of henna and aluminum combination tanning system as an effective alternative cleaner tanning methodology. Note de contenu : - EXPERIMENTAL METHODS : Materials - Aqueous extraction of tannins from henna leaves - Preparation of basic aluminum sulfate solution - Henna and aluminum combination tannage - Measurement of hydrothermal stability of leathers - Physical testing and hand evaluation of leathers - Measurement of softness in leathers - Scanning electron microscopic analysis of leather samples - Analysis of spent liquors from tanning trials - Analysis of exhaustion of tanning spent liquors - Color measurements of control and experimental leathers - Evaluation of chemical constituents in leathers.
- RESULTS AND DISCUSSION : Optimization of combination tanning system using henna and aluminum - Performance of leathers organoleptic properties of leathers - Strength characteristics of experimental and control crust leathers - Softness measurements of henna-Al tanning system - Scanning electron microscopic analysis of leather samples - Reflectance measurements - Effect of surface color on control and experimental leathers - Chemical analysis of the crust leather - Environmental tolerability and spent liquor analysis.En ligne : https://drive.google.com/file/d/1Gf6K3aai4yAs469aF02XfUDmHP8G4M0Z/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11718
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Code-barres Cote Support Localisation Section Disponibilité 16697 - Périodique Bibliothèque principale Documentaires Disponible High exhaust chrome-aluminium combination tanning : Part 1. Optimization of tanning / Kalarical Janardhanan Sreeram in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 3 (03/2006)
PermalinkHydration in matrix stabilization of collagen fibres : relevance to mechanistic insight into tanning / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 7 (07/2003)
PermalinkIntegration of chrome tanning and wet finishing process for making garment leathers / Palanisamy Thanikaivelan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 6 (06/2005)
PermalinkInteraction of aluminum and hydrolysable tannin polyphenols : An approach to understanging the mechanism of aluminum vegetable combination tannage / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 9 (09/2006)
PermalinkIsolation and characterization of a low affinity chromium(III) complex in chrome tanning solutions / Jonnalagadda Raghava Rao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 6 (11-12/1997)
PermalinkKinetics of inhibition of type I collagenase by dialdehyde cellulose in stabilization of type I collagen / Gladstone Christopher Jayakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 3 (03/2015)
PermalinkLignin based colorant : modified black liquor for leather surface coating application / P. Balasubramanian in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 10 (10/2018)
PermalinkMetal organic based syntan for multi-stage leather processing / Gladstone Christopher Jayakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 9 (09/2015)
PermalinkMixed metal complexes of zirconium : A step towards reducing usage of chromium in tanning / Kalarical Janardhanan Sreeram in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 3 (03/2004)
PermalinkMixed metal tanning using chrome-zinc-silica : A new chrome-saver approach / N. N. Fathima in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 4 (04/2003)
PermalinkA modified leather processing method for water and pollution reduction in tannery / Subramani Saravanabhavan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 1 (01/2008)
PermalinkA molecular level investigation of dialdehyde starch interaction with collagen for eco-friendly stabilization / Gladstone Christopher Jayakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 5 (05/2015)
PermalinkMolecular level understanding of tanning using an organo-zirconium complex / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 11 (11/2003)
PermalinkNatural dyeing of leathers using natural materials / Jonnalagadda Raghava Rao in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 3 (02/2008)
PermalinkNatural fibers reinforced chrome shaving composites for sound absorption applications / D. Hemalatha in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 11 (11/2018)
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