![](./images/home.jpg)
![](./images/bar_spacer.gif)
Détail de l'auteur
Auteur Jonnalagadda Raghava Rao
Commentaire :
Central Leather Research Institute - Adyar - Chennai - India
|
Documents disponibles écrits par cet auteur
![](./images/expand_all.gif)
![](./images/collapse_all.gif)
Development of formaldehyde-free leathers in perspective of retanning : Part 1. Benchmarking for the evolution of a single syntan system / Palanisamy Thanikaivelan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 10 (10/2007)
![]()
[article]
Titre : Development of formaldehyde-free leathers in perspective of retanning : Part 1. Benchmarking for the evolution of a single syntan system Type de document : texte imprimé Auteurs : Palanisamy Thanikaivelan, Auteur ; C. Ram Mohan, Auteur ; Subramani Saravanabhavan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2007 Article en page(s) : p. 306-314 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The awareness of health risks due to the use of leather products is escalating day by day. The demand for eco-labelled leather and leather products is increasing in the developed countries. Eco-labeling concepts force the tanners to look into various options for developing eco-benign products. Formaldehyde is classified as a probable human carcinogen. In this study, an attempt has been made to produce leather without formaldehyde by employing formaldehyde-free syntans. A relative measure of performance of formaldehyde-free and formaldehyde based syntans has been done to test their ability to produce leathers with desired properties by employing these syntans individually. Three formaldehyde-free syntans (resin, acrylic and protein) and two formaldehyde based syntans have been chosen for optimization trials. Trials have been carried out to find out the optimal amount of individual syntans required for providing sufficient properties to the leather. Based on organoleptic and strength properties as well as other property evaluation, it has been found that 12 and 8% formaldehyde based syntans A and B and 8, 10 and 12% formaldehyde-free resin, acrylic and protein syntans are capable of providing sufficient properties to the leather. There seems to be a considerable relation between the nature of the syntans and properties imparted to the leather. Aromatic syntans tend to decrease the strength and softness properties of leathers with increasing offer. Relation between the fullness of leathers and offer of syntans has been substantiated through scanning electron microscopy. The leathers treated with formaldehyde-free syntans do not contain free formaldehyde when analyzed using standard procedure and hence do not possess any health risks. En ligne : https://drive.google.com/file/d/15iClkdMNH44GxjWG196MOaLkn6-kQ0cG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3324
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 10 (10/2007) . - p. 306-314[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008304 - Périodique Bibliothèque principale Documentaires Disponible Development of a leather processing method in narrow pH profile : Part 1. Standardisation of dehairing process / Palanisamy Thanikaivelan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 84, N° 6 (11-12/2000)
![]()
[article]
Titre : Development of a leather processing method in narrow pH profile : Part 1. Standardisation of dehairing process Type de document : texte imprimé Auteurs : Palanisamy Thanikaivelan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2000 Article en page(s) : p. 276-284 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux
Epilage enzymatique
Essais dynamiquesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : An attempt has been made to develop a method for processing leathers in a narrow range of pH viz., 4.0 8.0. A process for dehairing at a pH of around 8.0 has been explored. This has been achieved by employing a commerical enzyme in combination with small quantifies of sodium sulphide. A method for applying the dehairing formulation on the grain side was established. Hair removal was shown to be complete using scanning electron microscopy (SEM ) and cystine content analysis. Potential grain damage by the enzyme formulation was avoided through process control measures and the effectiveness of such methods was established by investigation by scanning electron micrographs. Strength and bulk properties of the experimental leathers appear to show some improvement as compared to the leathers made using conventional processes. The process enjoys an environmental benefit by significantly reducing the COD load in the effluent. Improved chrome content in the grain surface of the butt region adds an additional benefit to the dehairing process developed. Note de contenu : - EXPERIMENTAL PROCEDURE : Standardisation of dehairing process - Comparison of effectiveness of the developed process with a conventional unhairing process
- RESULTS AND DISCUSSION : Standardisation of dehairing system - Developed dehairing process vs conventional dehairing process
- Table 1 : Composition of paste for determination of depilatory mixture
- Table 2 : Composition of paste for different methods of application
- Table 3 : Composition of paste for optimisation of depilatory mixture
- Table 4 : Physical testing of control and experimental leathers
- Table 5 : Stratigraphic distribution of chromium
- Table 6 : Composite liquor analysisEn ligne : https://drive.google.com/file/d/1UYGono16nGaXlpW4eI3EptAUIpd2gY6A/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40819
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 84, N° 6 (11-12/2000) . - p. 276-284[article]Development of leather processing method in narrow pH profile : Part 2. Standardisation of tanning process / P. Thanikaivlaen in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 3 (05-06/2001)
![]()
[article]
Titre : Development of leather processing method in narrow pH profile : Part 2. Standardisation of tanning process Type de document : texte imprimé Auteurs : P. Thanikaivlaen, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2001 Article en page(s) : p. 106-115 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eau -- Consommation
Liqueurs de tannage -- Analyse
Normalisation
pH
Tannage au chromeIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Conventional methods employed in leather processing subject the skin or hide to wide variations and alterations in pH. This contributes to an increase in COD. TDS. chlorides, sulphate and other minerals in tannery waste waters.
A process sequence has now been explored to limit the pH range in leather processing from 4.0 to 8.0.
In the previous investigation, development of a dehairing process at pH 8.0 was demonstrated. In this investigation, an appropriate tanning system with adequate opening—up at a pH range of 4.0—8.0 has been investigated. The required fibre opening was achieved by means of lyotropic rather than osmotic swelling. The conditions for chrome tanning were standardised without conventional pickling.
A sequence of operations, viz., enzyme assisted zero-lime dehairing, lyotropic swelling for fibre opening and pickle-less chrome tanning provides leathers matching the functional performance of commercial upper leathers. The modified process leads to a substantial environmental benefit as observed in the reduction of chemical oxygen demand and total solids when compared to conventional processes. The process explored appears to be economy viable.Note de contenu : - EXPERIMENTAL PROCEDURES : Optimisation of opening-up of fibre bundles - Standardisation of tanning system - Selection of tanning system - Comparison of efficiency of selected tanning system with conventional tanning process
- RESULTS AND DISCUSSION : Standardisation of opening-up of fibre bundles - Standardisation of tanning system - Selected tanning system vs. conventional tanning system - Feasibility study
- Table 1 : Layer wise chromium content for pieces treated with enzymes and lyotropic agent (urea)
- Table 2 : Comparison of topological and stratigraphic distribution of chromium in control and experimental et-blue sides
- Table 3 : Comparison of characteristics of spherical particles in different chrome tanning systems
- Table 4 : Physical testing data of control and experimental leathers
- Table 5 : Analysis of spent chrome Iiquors
- Table 6 : Composite liquor analysis for conventional and experimental leather processing
- Table 7 : Comparison of water and time requirement for conventional and experimental leather processingEn ligne : https://drive.google.com/file/d/1fgtfGb6Cx6of1gWWKLw3QLB7i5opsjxE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40365
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 3 (05-06/2001) . - p. 106-115[article]Development of natural colors in Cr-Fe tanned upper leathers / Jonnalagadda Raghava Rao in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 7 (07/2002)
![]()
[article]
Titre : Development of natural colors in Cr-Fe tanned upper leathers Type de document : texte imprimé Auteurs : Jonnalagadda Raghava Rao, Auteur ; C. Prabhakar, Auteur ; R. Rajapandian, Auteur ; Palanisamy Thanikaivelan, Auteur ; J. Malathi, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2002 Article en page(s) : p. 267-283 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Dyes based on synthetic formulations are being widely used in the leather industry. However, it is known that many aryl amine dyes are banned due to their carcinogenic nature. Environmental concern leads one to look for dye products based on natural resources, which have several advantages like biodegradability, less toxicity, etc. The basis of this approach is to achieve an eco-friendly dyeing process with the use of iron salts, which give rise to various colors on reacting with vegetable tannins. Goatskins have been tanned with Cr-Fe tanning salt and striked with different vegetable tanning materials like wattle, chestnut, myrobalan and quebracho at various concentrations. Colors like brown, bluish black, deep black and grey shades have been developed. The color shades obtained have been quantified by reflectance measurements and compared with the visual assessment data. The strength and bulk properties are not significantly altered by increasing the concentration of various vegetable tannins from 1 to 5%. However, treatment with 5% wattle decreases the strength properties of the leathers appreciably due to its heavy filling nature coupled with prior filling using co-filling syntans. En ligne : https://drive.google.com/file/d/1V2CEzpPOP0NqfSdqEwjsHzy5U6UKp9Bf/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4287
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 7 (07/2002) . - p. 267-283[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 001576 - Périodique Bibliothèque principale Documentaires Disponible Development of natural garment leathers : a metal-free approach / Kalarical Janardhanan Sreeram in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 12 (12/2010)
![]()
[article]
Titre : Development of natural garment leathers : a metal-free approach Type de document : texte imprimé Auteurs : Kalarical Janardhanan Sreeram, Auteur ; Rathinam Aravindhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2010 Article en page(s) : p. 401-409 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acacia et constituants
Cuirs et peaux -- Propriétés organoleptiques
PolyamidesUn polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine.
Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères.
Tannage végétal
Vêtements en cuirIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Growing concerns over the toxicity of chromium and its influence on the health of customers using chromium tanned garment leathers has forced the leather industry to search for alternative tanning agents. Semi-metal tanning agents, aldehyde based systems, etc. Semi-metal tanning agents, aldehyde based systems, etc. have been considered but the toxicity issues are lingering. Hence, in the present study an attempt has been made to develop vegetable tannins and subsequent stripping prior to retanning and fatliquoring has been evaluated. It has been found that an 8 % offer of wattle for tanning provides better physical and organoleptic properties. A polyamide based retanning system was found to offer better perspiration and organoleptic properties. Amongst the various fatliquoring compositions, 50:50 combination of synthetic and natural fatliquors was found to offer higher softness. The optimized tanning-retanning-fatliquoring combination was found to be comparable to chrome tanned garment leathers and superior to semichrome garment leathers. En ligne : https://drive.google.com/file/d/1ySWQQy7he2G3jwUybArcpd85X-LxcoHQ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10504
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 12 (12/2010) . - p. 401-409[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 012693 - Périodique Bibliothèque principale Documentaires Disponible Direct chrome liquor recycling under indian conditions : Part 1. Role of chromium species on the quality of the leather / Kalarical Janardhanan Sreeram in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 6 (06/2005)
![]()
PermalinkDual functional replacement syntans for leather / Jaya Prakash Alla in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 3 (03/2021)
![]()
PermalinkDyeing of chamois leather using water soluble sulphure dyes / A. Jaya Prakash in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 10 (10/2016)
![]()
PermalinkEffect of acid swelling and its impact on the properties of cow industrial glove leathers / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 6 (06/2023)
![]()
PermalinkEffect of different unhairing methods on the ionic liquid based fiber opening process / Z. Mohammad Jamal Azhar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 6 (06/2016)
![]()
PermalinkEffect of finishing auxiliaries on permeability of leathers / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 11 (11/2015)
![]()
PermalinkEffect of syntan to fatliquor ratio on porosity and mechanical properties of wet-blue leather / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 4 (04/2017)
![]()
PermalinkEnzymatic hydrolysis of limed trimmings : preparation, characterization and application of collagen hydrolysate / Mohammed Hussein in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 2 (02/2017)
![]()
PermalinkEvaluation of antifungal activity of carbonate solvent - Part : 1 / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 11 (11/2021)
![]()
PermalinkEvaluation of antimicrobial activity of Lawsonia Inermis (Henna) against microbial strains isolated from goat skin/leather / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 5 (05/2011)
![]()
PermalinkFish skin and exotic leathers / Jaya Prakash Alla in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 2 (02/2017)
![]()
PermalinkGlove 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)
![]()
PermalinkGreen 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)
![]()
PermalinkGreen 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)
![]()
PermalinkHenna–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)
![]()
PermalinkHigh 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)
![]()
Permalink