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Auteur Jonnalagadda Raghava Rao
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Central Leather Research Institute - Adyar - Chennai - India
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Solving vein marks defects problem through wet end process / K. Gowthaman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 9 (09/2014)
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Titre : Solving vein marks defects problem through wet end process Type de document : texte imprimé Auteurs : K. Gowthaman, Auteur ; S. Vikram, Auteur ; N. N. Fathima, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2014 Article en page(s) : p. 278-283 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Défauts
Cuirs et peaux -- Finition
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés organoleptiques
Défaut de veine (cuir)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather grading is done on the basis of number of defects found on the leather. Defects either ante mortem or post mortem thus affect the final quality and price of the leather. In this study, we have investigated one of the ante mortem defects namely vein marks and have developed a process for upgrading leathers with this defect. SEM studies clearly depict the groove or indentation due to the vein marks. Upgradation using finishing often results in affecting the breathability of leathers. Hence, we have adopted a strategy of changing the post tanning recipe for upgradation of leathers with vein marks. The optimized post tanning recipe resulted in upper leathers with visibly reduced vein marks and the strength and organoleptic properties are on par with that of control leathers. Thus, this study shows that vein marks defect in leathers can be overcome by suitable post tanning process modifications. Note de contenu : - EXPERIMENTAL : Post tanning operations - Physical testing of leather samples - Evaluation of organoleptic properties - Wet and dry rub fastness - Scanning electron microscopic analysis
- RESULTS AND DISCUSSION : Strategy followed for optimization of the post-tanning recipe - Upgradation in vein marks leathers - Physical strength characteristics, organoleptic properties and rub fastness measurementsEn ligne : https://drive.google.com/file/d/1iUAdqD0l62TdRRaqH20vDDq9OAGcz1RB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21865
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIX, N° 9 (09/2014) . - p. 278-283[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16485 - Périodique Bibliothèque principale Documentaires Disponible Stepping into third millennium : Third generation leather processing : A three step tanning technique / Palanisamy Thanikaivelan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 5 (05/2003)
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Titre : Stepping into third millennium : Third generation leather processing : A three step tanning technique Type de document : texte imprimé Auteurs : Palanisamy Thanikaivelan, Auteur ; T. Ramasami ; Balachandran Unni Nair ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2003 Article en page(s) : p. 173-184 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The do-undo methods adopted in conventional leather processing generate huge amounts of pollutants. In other words, conventional methods employed in leather processing subject the skin/hide to wide variations in pH. Pre-tanning and tanning processes alone contribute more than 90% of the total pollution from leather processing. Apart from this, a great deal of solid wastes like lime and chrome sludge is being generated. In the approach described here, the hair and flesh removal as well as fibre opening have been achieved using biocatalysts and sodium hydroxide at pH 8.5 for cow hides. This was followed by a pickle free chrome tanning, which does not require a basification step. Hence, this tanning technique involves primarily three steps namely dehairing, fibre opening and tanning. It has been found that the extent of hair removal and opening up of fibre bundles is comparable to that of the control. This has been substantiated through scanning electron microscopic, stratigraphic chrome distribution analysis and softness measurements. Performance of the leathers is shown to be on par with conventionally processed leathers through physical and hand evaluation. Importantly, softness of the leathers is quantitatively found to be comparable with that of control. The process also demonstrates reduction in chemical oxygen demand (COD) load by 71%, total solids load by 72% and chromium load by 84% compared to the conventional process. The total dry sludge from the beam house processes is brought down from 149 to 14 kg for processing 1 ton of raw hides. The input-output audit shows that the biocatalytic three step tanning process employs very low amount of chemicals thereby reducing the discharge by 84% compared to the conventional multi step processing. Further, it has also been demonstrated that the process is techno-economically viable. En ligne : https://drive.google.com/file/d/1Y0DaEEJ319MBo2-rfDLS1Oet_zbMfrKl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4120
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 5 (05/2003) . - p. 173-184[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001587 - Périodique Bibliothèque principale Documentaires Disponible Stimuli responsive leathers using smart retanning agents / Sangeetha Subramanian in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 6 (06/2012)
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Titre : Stimuli responsive leathers using smart retanning agents Type de document : texte imprimé Auteurs : Sangeetha Subramanian, Auteur ; N. N. Fathima, Auteur ; Kalarical Janardhanan Sreeram, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2012 Article en page(s) : p. 196-204 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermique
Cuir
Formaldéhyde
Fourier, Spectroscopie infrarouge à transformée de
Matériaux intelligents
Matériaux thermosensibles
MélamineLa mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6.
Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde.
Microscopie électronique à balayage
Naphtalène
Retannage
Syntans
Thermogravimétrie
Transition de phaseEn physique, une transition de phase est une transformation du système étudié provoquée par la variation d'un paramètre extérieur particulier (température, champ magnétique...).
Cette transition a lieu lorsque le paramètre atteint une valeur seuil (plancher ou plafond selon le sens de variation). La transformation est un changement des propriétés du système.Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The main use of leather is to protect the body against external environment and to provide comfort. However, leather may be used for additional functions specific to 1) an adverse or extreme climate and 2) job-ambience or profession so as to enhance adaptability and productivity of the user. When such an application arises, the leather is termed as “smart material”. Making leather perform the functions it did as a skin on a live animal renders it as smart leather. Hence, the futuristic objective is to make the processed skin termed “leather” retain its memory so as to result in “smart or intelligent leather”. In this paper, it has been attempted to incorporate thermo responsive function into leathers using smart materials such as phase changing materials (PCM). PCMs are capable of absorbing or releasing large amount of heat during phase transitions between two solid states and/or liquid and solid states. Manufacture of syntans using PCM based on two different prepolymers viz, melamine formaldehyde and naphthalene sulfonic acid has been attempted in this paper. The retanning agents synthesized have been characterized using various techniques like FT-IR, DSC, TGA and SEM analysis. Leathers made using PCM incorporated retanning agents have been tested for various properties viz. strength properties, thermal stability, organoleptic properties to study the influence of the PCM incorporated retanning agents. Note de contenu : - REAGENTS
MICROENCAPSULATION OF n-OCTADECANE : Synthesis of prepolymer solution - Synthesis of oil phase - Synthesis of water phase - Emulsion preparation - Fabrication of microcapsules (PCM))
- CHARACTERIZATION OF SMART RETANNING AGENTS : FT-IR analysis - Differential scanning calorimetry - Thermo-gravimetric analysis - Scanning electron microscopy
- RETANNING AND CHARACTERIZATION OF LEATHERS MADE USING SMART RETANNING AGENTS
- CHARACTERIZATION OF RETANNING AGENTS MADE USING PCM FTIR ANALYSIS : Scanning Electron Microscopy analysis - Thermo Responsive Function Analysis
- PROPERTIES OF LEATHER MADE USING PCM : Thermal Stability (DSC and TGA) of leathers - Scanning Electron Microscopic Studies of Leathers - Physical strength characteristics of leathers - Hand evaluation of leathers - Thermo responsive functionEn ligne : https://drive.google.com/file/d/1q8RiPFy-qGqifrMclOhTAMfwDOMHfayT/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15533
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 6 (06/2012) . - p. 196-204[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13991 - Périodique Bibliothèque principale Documentaires Disponible Studies of ethiopian sheepskins as an opportunity for value addition, part II : optimization and characterization of wanke upper and garment leather / H. Mohammed in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 5 (05/2014)
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Titre : Studies of ethiopian sheepskins as an opportunity for value addition, part II : optimization and characterization of wanke upper and garment leather Type de document : texte imprimé Auteurs : H. Mohammed, Auteur ; G. Aysanew, Auteur ; Rathinam Aravindhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Chandra Babu Narasimhan Kannan, Auteur Année de publication : 2014 Article en page(s) : p. 161-169 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux de moutons
Vêtements en cuirIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Ethiopian tanners face a shortage of raw material input for the production of leather. The government strategically planned for importing raw skins from neighboring countries and also for effective utilization of available raw material resources in the country. The meat of Wanke sheep is in high demand in international markets, but the skin commands low price not only due to low availability but also less demand by tanners due to natural problems associated with the skin. Hence, tanners treat the skin as a reject. The problems of Wanke skin include high natural fat deposition, thin substance and low strength. Usually, leathers made out of Wanke skins have low selections compared to Ethiopian sheep skins and are mainly utilized for making lining leather. In this work, efforts have been made to develop a process technology for making high value leathers with improved properties from Wanke sheepskin. Note de contenu : - MATERIALS AND METHODS : Process design and standardization - Physical characterization of the skin
- RESULT AND DISCUSSION : Processing strategy - Organoleptic properties - Pilot scale trials for making wanke garment and ladies upper leathersEn ligne : https://drive.google.com/file/d/1sZ5yZi_0u5m7oFbmIpCIcjFLSWCtSUiT/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21288
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Code-barres Cote Support Localisation Section Disponibilité 16230 - Périodique Bibliothèque principale Documentaires Disponible Studies on combination tanning based on henna and oxazolidine / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 10 (10/2009)
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Titre : Studies on combination tanning based on henna and oxazolidine Type de document : texte imprimé Auteurs : A. E. Musa, Auteur ; Balaraman Madhan, Auteur ; Rathinam Aravindhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; B. Chandrasekaran, Auteur ; G. A. Gasmelseed, Auteur Année de publication : 2009 Article en page(s) : p. 335-343 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Among the innumerable alternative tannages that are currently exploited, the vegetable tannins and oxazolidine combination is one of the most promising options. In this study, an organic combination tanning process based on henna and oxazolidine for the production of upper leather is presented. Extract from the leaves of Lawsonia inermis (henna) obtained from Sudan has been utilized for tanning in combination with oxazolidine. It has been observed that this combination tanning, which employs 20% henna extract and 4% oxazolidine results in leathers with shrinkage temperature of 98oC. The differential scanning calorimetry data is in accordance with the observed shrinkage temperature. The change in the order of addition of henna and oxazolidine though showed marginal difference in thermal stability, but significant variations were observed in physical characteristics of leathers. Scanning electron microscopic analysis showed that leathers tanned first with oxazolidine resulted in better fibre splitting. Leather made from oxazolidine followed by henna resulted in relatively softer leathers compared to henna followed by oxazolidine tanning. Leather made from both the tanning combination systems meets the required strength characteristics for upper leathers. The manufacture of upper leathers using combination of henna and oxazolidine appears to be promising. En ligne : https://drive.google.com/file/d/1La-kCqjf6RzfG3UbEoSgcY1Sa9MvCGhn/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6370
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Code-barres Cote Support Localisation Section Disponibilité 011705 - Périodique Bibliothèque principale Documentaires Disponible Studies on ethiopian sheep skins as an opportunity for value addition part I : histological, microscopic and chemical characterization of abyssinian and wanke sheepskins / H. Mohammed in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 3 (03/2014)
PermalinkStudies on phosphonium based combination tanning : less chrome approach / N. N. Fathima in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 9 (09/2011)
PermalinkStudies on selective defect identification of crust leathers for computer-aided grading / S. Nithiyanantha Vasagam in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 6 (06/2013)
PermalinkStudies on tanning with zirconium oxychloride : Part I. Standardization of tanning process / A. Sundarrajan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 3 (03/2003)
PermalinkStudies on tanning with zirconium oxychloride : Part II. Development of a versatile tanning system / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 3 (03/2003)
PermalinkStudies on tara-phosphonium combination tannage : approach towards a metal free eco-benign tanning system / Rathinam Aravindhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 3 (03/2015)
PermalinkStudies on the development of leathers from formaldehyde-free melamine syntan / Swarna Vinodh Kanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 5 (05/2012)
PermalinkStudies on the development of a multi-functional syntan / R. Nataraj in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 7 (07/2009)
PermalinkStudies on the development of pickle-sess vegetable tanning / Subramani Saravanabhavan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 7 (07/2004)
PermalinkStudies on the henna-glutaraldehyde combination tanning system / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 3 (03/2011)
PermalinkStudies on the physico-chemical behavior of synthetic tanning agents in non-aqueous medium / Gladstone Christopher Jayakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 8 (08/2017)
PermalinkStudies on the removal of inter-fibrillary materials part I : Removal of protein, proteoglycan, glycosoaminoglycans from conventional beamhouse process / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 5 (05/2010)
PermalinkStudies on the removal of inter-fibrillary materials. Part II : removal of protein, proteoglycan and glycosoaminoglycans from biobased pre-tanning process / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 6 (06/2010)
PermalinkStudies on the stabilization of collagen using dialdehyde starch : Part I. Effect of autoclaving on dialdehyde starch / Swarna Vinodh Kanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 12 (12/2006)
PermalinkStudies on the use of bi-functional enzyme for leather making / Gladstone Christopher Jayakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 12 (12/2016)
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