Chrome free tannages : Part 1 - Preliminary studies / Samir Dasgupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 5 (09-10/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 5 (09-10/2002) . - p. 186-194 Titre : Chrome free tannages : Part 1 - Preliminary studies Type de document : texte imprimé Auteurs : Samir Dasgupta, Auteur Année de publication : 2002 Article en page(s) : p. 186-194 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux d'agneaux Douceur (toucher) Mimosa et constituants Oxazolidine Résistance à la déchirure Sels d'aluminium Sulfate de tétrakis hydroxyméthyl phosphonium Le sulfate de tétrakis hydroxyméthyl phosphonium est un myxobactéricide qui offre une prévention efficace contre les biofilms microbiens dans les eaux de traitement, et ce, pour une vaste gamme de micro-organismes formant des biofilms. Le sulfate de tétrakis (hydroxyméthyl) phosphonium agit principalement en augmentant la perméabilité de la membrane externe de l'enveloppe de la cellule microbienne, ce qui entraîne la libération rapide de protéines et d'autres substances cellulaires par les cellules. En outre, le sulfate de tétrakis (hydroxyméthyl) phosphonium inhibe le processus de sulfatoréduction dans les bactéries réductrices de sulfate. Tannage chrome free Tannage combiné Le 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 Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Tannage minéral Tannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium Tannage synthétique Tannage végétal Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The object of this study was to look afresh at the basic nature of a number of already established tanning agents, like aluminium chloride, aluminium sulphate, basic aluminium formate, basic aluminium acetate, and examine their tanningactivity alone or in combination with oxazolidines, tetrakishydroxy methyl phosphonium sulphate (THPS) andvegetable tanning agents. Note de contenu : - METHODOLOGY : 1) Studies on aluminium salts - 2) Tannages with aluminium salts - 3) Treatment of vegetable tanned lambskins with THPS and oxazolidine - 4) Vegetable tanned lambskins retanned with aluminium salt - RESULTS AND DISCUSSION : 1) Separation of various aluminium salts - 2) Tannages with aluminium salts - 3) Combination tannages with aluminium salts with other agents - 4) Combination with vegetable tanning agent (Mimosa Extract Powder ME) - Table 1 : Effect of aluminium retannage on the shrinkage temperature of vegetable tanned lambskin - Table 2 : Effect of aluminium retannage on the tear strength of vegetable tanned lambskin - Table 3 : Effect of oxazolidine offer on the shrinkage temperature of vegetable tanned lambskin (final pH 6.5; temperature – 45°C) - Table 4 : Effect of THPS offer on the shrinkage temperature of vegetable tanned lambskin (final pH 5.5; temperature – 45°C) - Table 5 : Effect of temperature on shrinkage temperature of vegetable/oxazolidine combination tanned skins - Table 6a : Effect of THPS/oxazolidine E retannages on the tear strength of vegetable tanned lambskin processed at 45C - Table 6b : Effect of THPS/oxazolidine E retannages on the tear strength of vegetable tanned lambskin - Table 7 : Effect of THPS/oxazolidine E retannage on the softness of vegetable tanned lambskin En ligne : https://drive.google.com/file/d/14NvgDGrpGo8I4x_2mpV1A04aUX3r50_V/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39858 [article]

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Modern researches in leather dyeing / Samir Dasgupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60 (Année 1976) . - p. 163-168 Titre : Modern researches in leather dyeing Type de document : texte imprimé Auteurs : Samir Dasgupta, Auteur Année de publication : 1976 Article en page(s) : p. 163-168 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Teinture Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The colour of the leather is the most important factor for its acceptance to the customer. Leather has other important characteristics such as water vapour permeability which are difficult to demonstrate convincingly to the customer. Recent developments in dyeing have contributed considerably towards producing serviceable leather in anticipation of the changing demand of the customer. Constant efforts should be made in the future to develop dyes with improved fastness properties, in particular dry-cleaning and perspiration fastness. Developments in the manufacturing technique of leather with better hydrothermal resistance would contribute towards improvements in continuous through-put dyeing systems. All these would further improve the competitive position of leather against synthetic materials. Note de contenu : - IMPROVEMENTS OF FASTNESS OF DYED LEATHER : Auxiliaries - Newer types of dyes - High temperature dyeing - NEWER TECHNIQUES OF DYEING : Dyeing through graft-polymerisation - Dyeing through tanning - Solvent-aided dyeing - Transfer printing - Continuous and newer processes of dyeing En ligne : https://drive.google.com/file/d/1kWryEkGectco3cQ2M_ifMAJPy8Q3WeR8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31843 [article]

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Modern researches in leather dyeing / Samir Dasgupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60, N° 6 (11-12/1976)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 60, N° 6 (11-12/1976) . - p. 163-168 Titre : Modern researches in leather dyeing Type de document : texte imprimé Auteurs : Samir Dasgupta, Auteur Année de publication : 1976 Article en page(s) : p. 163-168 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Teinture Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The colour of the leather is the most important factor for its acceptance to the customer. Leather has other important characteristics such as water vapour permeability which are difficult to demonstrate convincingly to the customer. Recent developments in dyeing have contributed considerably towards producing serviceable leather in anticipation of the changing demand of the customer. Constant efforts should be made in the future to develop dyes with improved fastness properties, in particular dry-cleaning and perspiration fastness. Developments in the manufacturing technique of leather with better hydrothermal resistance would contribute towards improvements in continuous through-put dyeing systems. All these would further improve the competitive position of leather against synthetic materials Note de contenu : - IMPROVEMENTS OF FASTNESS OF DYED LEATHER : Auxiliaries - Newer types of dyes - High temperature dyeing - NEWER TECHNIQUES OF DYEING : Dyeing through graft-polymerisation - Dyeing through tanning - Solvent-aided dyeing - Transfer printing - Continuous and newer processes of dyeing En ligne : https://drive.google.com/file/d/1kWryEkGectco3cQ2M_ifMAJPy8Q3WeR8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34114 [article]

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Modified thrublu chrome tanning for lambskins -Low residual - chrome tannages / Samir Dasgupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 3 (05-06/2004)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 3 (05-06/2004) . - p. 116-120 Titre : Modified thrublu chrome tanning for lambskins -Low residual - chrome tannages Type de document : texte imprimé Auteurs : Samir Dasgupta, Auteur Année de publication : 2004 Article en page(s) : p. 116-120 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Couleur Cuirs et peaux -- Propriétés physiques Cuirs et peaux d'agneaux Oxazolidine Tannage au chrome Tannage combiné Le 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 Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Chrome tanning has for a long time enjoyed a unique position amongst tanners all over the world and almost 90% of all leather produced is chrome tanned. The main reason for this relates to the following characteristics of chrome tanned leather : - high shrinkage temperature/hydrothermal stability - good flexibility - excellent fastness properties - lightweight and not too full - good comfort characteristics - good moulding and shape retention properties High shrinkage temperature, unequalled by any other tannage, has been the paramount feature of these benefits in favour of chrome tanning. A number of studies have been published recently suggesting that chromium (III) itself may be toxic at higher levels under certain ligand environments and also that chromium (VI) is a known carcinogen. In view of this tanners have to consider how best to modify their chrome tanning processes for better chrome exhaustion and also to look for means of minimising any impact on the environment. Note de contenu : - Optimal chrome tanning of lambskins - Optimal chrome/ oxazolidine E combination tanning of lambskins : Modified ThruBlu system for lambskin tannage - Table 1 : Effect of chrome offer (Cr2O3) on shrinkage temperature and chrome levels in leather and exhaust liquor - Table 2 : Colour values of lambskins with different chrome offers - Table 3 : Physical properties of chrome tanned leather with different chrome content - Table 4 : Reduction of chrome in exhaust with oxazolidine E - Table 5 : Comparative properties of chrome tanned leathers - Table 6 : Colour of lambskin leather En ligne : https://drive.google.com/file/d/1U4kzZ9mIig1Rq0dZydh_ps1lnGr6WSOq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39639 [article]

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Optimum chrome tanning ofhides and modified Thrublu process for lime-split hides / Samir Dasgupta in WORLD LEATHER, Vol. 18, N° 7 (11/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 7 (11/2005) . - p. 17-21 Titre : Optimum chrome tanning ofhides and modified Thrublu process for lime-split hides Type de document : texte imprimé Auteurs : Samir Dasgupta, Auteur Année de publication : 2005 Article en page(s) : p. 17-21 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome tanning for a long lime enjoyed a unique position amongst tanners all over the world and almost 90% of leather produced is chrome tanned. Of all these benefits, high shrinkage temperature bas been the paramount feature in favour of chrome tanning as this cannot be achieved by any other tanning systems. A number of studies have been published recently suggesting that Chromium(III) itself may be toxic at higher levels under certain ligand environment and Chromium(VI) is a known carcinogen. So, tanners have to consider how best to modify their chrome tanning process for better exhaustion of chrome and look for alternative means to minimise the impact of tanning on the environment. LASRA research has shown that none of the alternatives to chrome free tanning systems are as cost effective and cheap than chrome tanning. The best commercial option is, therefore, to develop an effective chrome management system for the tannery. Several chrome management technologies have emerged recently. Among the options available is the no pickle ThruBlu process, first introduced for lambskins in 1993 at LASRA Conference by DasGupta and further developed and subsequently extended to split hides tannages. h is is the most cost effective and easily adoptable. But this novel system challenges the basic established theory of chrome tanning and therefore demands conviction from tanners. The partial substitution of chromium with alternative tanning agents like Oxazolidine E (Zolidine E, Angus Chernicals), THPS (Albrite AD, Rhodia) is also promising because this combines benefits of both the tanning materials. To develop an effective optimum system, a tanner must first find out what is the minimum amount of chrome that is required to satisfy his customer requirements, both in respect of dye ability and other performance requirements. This is a must before subsequent options can be considered, such as : - Simply recycling the chrome exhaust in pickle - Precipitate the chrome in the exhaust liquor, then deposit the cake in land fill - Precipitate the chrome in the exhaust liquor, regenerate as chrome tanning agent for reuse. This report outlines systems which give an optimum chrome tanning of hides. Further, LASRA ThruBlu process that was originally devised for delimed hides, has been modified for chrome tanning of pickled hides to minimise chrome in exhaust liquors. Note de contenu : - The optimum chrome tannage of hides - Modification of the Thrublu process : Residual formaldehyde in the modified Thrublu leather - Panel 1 : 1. Effect of chrome offer on shrinkage temperature of wet blue sides, °C - 2 : Effect of chrome offer on the residual chrome in exhaust liquor - 3 : Layerwise distribution of chrome in side leather - Panel 2 : 1 : Tear and tensile strength of chrome tanned side leather - 2 : Grain strength of chrome tanned side leather - Panel 3 : The original LASRA ThruBlu process - Panel 4 : 1. Effect of tannage on the shrinkage - 2. Layerwise distributionof chrome in leather - Panel 5 : 1. Tear and tensile strength of chrome side leather - 2. Grain strength of chrome tanned side leather - Panel 6 : Softness of chrome tanned side leather - Panel 7 : Formaldehyde content of chrome tanned side leather En ligne : https://drive.google.com/file/d/1rfPARWOhJl1od96TFxYmhydX-2k77r0M/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32492 [article]

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Oxazolidines - A new class of tanning agents / Samir Dasgupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61, N° 5 (09-10/1977)  

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Oxazolidines - A new class of tanning agents / Samir Dasgupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61 et 62 (Années 1977 et 1978)  

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