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JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) / Union internationale des sociétés de techniciens et chimistes des industries du cuir . Vol. 85, N° 6Mention de date : 11-12/2001Paru le : 15/11/2001 |
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Ajouter le résultat dans votre panierUsing ashes from incineration of chromium sulphate tanned leather scrap. Part 2 : Tanning liquors, additives in footwear adhesives and fillers in mortars / M. J. Ferreira in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 6 (11-12/2001)
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Titre : Using ashes from incineration of chromium sulphate tanned leather scrap. Part 2 : Tanning liquors, additives in footwear adhesives and fillers in mortars Type de document : texte imprimé Auteurs : M. J. Ferreira, Auteur ; E. Xara, Auteur ; M. F. Almeida, Auteur ; M. Barla, Auteur ; J. Ferrer, Auteur Année de publication : 2001 Article en page(s) : p. 193-198 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésifs -- Additifs
Caractérisation
Cendres
Charges (matériaux)
Chrome
Cuirs et peaux -- Déchets -- Recyclage
Mortier -- Additifs
Récupération (Déchets, etc.)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chromium is the basis of leather manufacture and its extractable reserves are limited in distribution.
mainly in South Africa. Zimbabwe and ex-USSR countries. Almost 20% of the metal is used by the chemical industry where one third of it goes into leather production as chromium sulphate tanning agent.
The European Union depends on chromium imports as for most other metals.
After burning leather scrap tanned with chromium sulphate. the very rich chromium resulting ashes may contain chromium (VI) in such a concentration that it becomes a hazardous waste and needs careful
handling. 23Thus. both economic and environmental reasons suggest the use of these ashes.
This paper follows another 4in presenting some of the work carried out under CRAFT project BRST CT96-5085. where leather incineration ashes generated by two different pilot—combustion systems, respect ively a fixed grill incinerator (FGI) and a fluidized bed incinerator (FBI) were characterized and some alternatives for using those ashes were studied. In the previous paper two routes for recovering chromium from leather ashes were considered as well as the influence of some factors on their efficiency. Now, producing chromium sulphate tanning liquors with chromium leached from the ashes is considered, as well as some other alternatives of using those ashes, namely as additives in footwear adhesives and fillers in mortars.Note de contenu : - Characterization of ashes
- Application of recovered chromium in the leather industry as tanning agent
- Application of ashes in footwear adhesives
- Application of ashes as a filler in mortars
- Table 1 : Chemical characteristics of leathers tanned using a 50/50 mixture of commercial and FBI ash derived liquor
- Table 2 : Physical characteristics of leathers tanned using a 50/50 mixture of commercial and FBI ash derived liquor
- Table 3 : Characteristics of leathers tanned using a 50/50 mixture of commercial and FGl ash derived liquor
- Table 4 : Characteristics of leathers tanned using a 75/75 mixture of commercial and FGI ash derived liquor
- Table 5 : Type of failure of leather adhesive bonding
- Table 6 : Heavy metals in the leachates from ashes and mortars DIN 38414-S-4 tests and Photobacterinin Phosphoreum toxicityEn ligne : https://drive.google.com/file/d/1g9VcBCydqP4pVFRkAKVhOvYQeHtRAxJg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40213
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 6 (11-12/2001) . - p. 193-198[article]Stability of a Rhus Coriaria L. tannin extract under different storage conditions / A. Zalacain in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 6 (11-12/2001)
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Titre : Stability of a Rhus Coriaria L. tannin extract under different storage conditions Type de document : texte imprimé Auteurs : A. Zalacain, Auteur ; I. Blazquez, Auteur ; G. L. Alonso, Auteur ; M. Carmona, Auteur Année de publication : 2001 Article en page(s) : p. 203-206 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie en phase liquide à hautes performances
Extraction (chimie)
Extraits de plantes
Spectrophotométrie infrarouge
Stabilité au stockage
Sumac et constituantsRhus est un genre d'arbres ou d'arbustes de la famille des Anacardiacées, communément appelés sumacs en France, summaqen arabe littéraire et qui signifie "rouge". Il compte environ 125espèces présentes dans les régions subtropicales et tempérées dans de nombreuses parties du monde.Les plus connues sont le sumac vinaigrier (Rhus typhina) originaire d'Amérique du Nord et le sumac des corroyeurs (Rhus coriaria) indigène en Europe du Sud et au Proche-Orient
- Utilisation : Comme l'appellation "sumac des corroyeurs" y fait allusion, certains sumacs sont utilisés dans le tannage du cuir, les feuilles contenant beaucoup de tanin. Le tannage au sumac rend le cuir souple et léger. Le maroquin peut être tanné au sumac. Il est encore utilisé pour la teinture des laines des tapis. Il ne faut pas le confondre avec le Sorgo sumac qui est un antioxydant très puissant avec un indice ORAC de 312 400.
- Consommation : Les baies du sumac des corroyeurs, Rhus coriaria, également appelé vinaigrier, sont également utilisées en cuisine du Moyen-Orient comme condiment. (Wikipedia)
Tanins végétauxIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In the past year, vegetable tannin consumption has increased considerably. Having overconie the problems that sumac (Rims corearia L.) gave in the past. it is now possible to reintroduce it in tanneries. It would be convenient to present this extract as a liquid. In this work, we have studied by hide powder assay. UV-Vis spectrophotometry and HPLC-DAD the stability of liquid sumac extracts with different tannin contents and that were kept in different storage conditions. If no stabilizer is added, the higher the extract concentration the lower the loss of tanning activity. Low temperatures such as 4°C or - 5C help to maintain the sample’s tanning properties for longer periods. Adding small quantities of a stabilizer (80 mg/L SO,) to different liquid extracts helps such samples to maintain their tanning capacity after storage for 9 months at 35 C, this behaviour is similar to the powder control sample. Note de contenu : - MATERIALS AND METHODS : Vegetable material and extraction process - State and storage conditions of the extract - Measurement of the tanning capacity - HPLC analysis
- RESULTS AND DISCUSSION : Degradation products - Extract stabilityEn ligne : https://drive.google.com/file/d/1VUjq59-NJeAQ9UNrizuGJyZOaTPy-pMU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40214
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 6 (11-12/2001) . - p. 203-206[article]Structure of skin in collagenous fibres : crossbreeds from black-and-white-cows X bulls of beef breeds / Piotr Zapletal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 6 (11-12/2001)
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Titre : Structure of skin in collagenous fibres : crossbreeds from black-and-white-cows X bulls of beef breeds Type de document : texte imprimé Auteurs : Piotr Zapletal, Auteur ; J. Szarek, Auteur ; A. Weglarz, Auteur Année de publication : 2001 Article en page(s) : p. 207-210 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bovins -- Races
Collagène -- Analyse
Croisement de races
Cuirs et peaux de bovins
Peau -- analyse
Peau -- HistologieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The aim of this study was to define the effect of crossing Black-and-White (CB) cattle with Italian beet' breeds (Piemontese-P. Marchigiana-M and Chianina-.Ch) and with Aberdeen Angus (AA) breed as well as that of pure Black-and—White breed with AA and Simmental (S) bulls, on the histological structure of skin tissue and properties of the collagen fibres. Knowledge of the arrangement and structure of' collagen fibres of the studied skins may be helpful in choosing the correct technological process for their dressing, or in developing a new one which would result in a better utilisation of raw material.
It can be stated that analysis of’ photographs of skin tissue under scanning electron microscopy (SEM) corresponds with the results of fibre measurements conducted under a light microscope. Skin tissue of bulls (CB x P) x AA and CB x AA showed the smallest spacing between the bundles of collagen fibres. The largest number of fibres in a bundle was contained in the skins of crossbreeds (CB x M) x AA and (CB x P) x AA. In contrast. the skins of S and (CB x Ch) x AA. crossbreeds (CB x M) x AA and (CB x P) x AA were characterised by a largest number of fine fibres in a bundle. Based on an organoleptic assessment the latter skin tissue displayed higher fineness and softness as well as better elasticity.
The thickness of the collagen fibres was relatively greater in the skins of those breed groups. which were characterised by a smaller number of fibres in a bundle. A high content of collagen in the skin of Simmental and CB x S bulls is indicative of its extended structure and denser network.Note de contenu : - Table 1 : Selected parameters of skin histological structure
- Table 2 : Selected parameters of skins ultrastruktural structure (scanning microscope)En ligne : https://drive.google.com/file/d/14rMlnaSUXfvi5a20zck_Strc8pn1HjBR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40215
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 6 (11-12/2001) . - p. 207-210[article]Cr(VI) Formation in leather during post-tanning processes / D. Chaudhuri in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 6 (11-12/2001)
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Titre : Cr(VI) Formation in leather during post-tanning processes Type de document : texte imprimé Auteurs : D. Chaudhuri, Auteur ; S. K. Sarkar, Auteur Année de publication : 2001 Article en page(s) : p. 211-216 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ammoniac
Analyse quantitative (chimie)
Bicarbonate de sodium
Cuir -- Teneur en chrome hexavalent
Cuirs et peaux -- Analyse
Déshydratation
Neutralisation (chimie)
Post-tannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Experiments have been conducted to examine the influence of three parameters, namely, degree of neutralisation. intensity of acidification towards the end of fatliquoring and drying condition, on the development of Cr(VI) in soft leathers such as utility gloving which require very strong deacidification.
Chrome tanned cow hide pieces have been neutralised, fatliquored, dried and eventually analysed quantitatively for Cr(VI) using EN420, a colorimetric method based on diphenyl carazide (DPC).
Experiments have also been carried out to identify the processing stages at which Cr(VI) can be detected in leather. In this case, samples of leather have been drawn during processing at the end of different unit operations, namely, neutralisation, fatliquoring and drying with or without sunlight and all these samples have been analysed for Cr(VI) immediately using the same analytical method.
The results of all these experiments are presented here. The results show that a high degree of neutralisation when combined with total absence of acidification in the final stage of fatliquoring and sun-drying, results in leather containing large amounts of Cr(VI). Therefore, the results of the experiments conducted in the present study clearly indicate that coversion of Cr(Ill) to Cr(VI) takes place during processing of chrome tanned hide specially for soft leathers such as garment and utility gloving.Note de contenu : - Possible Sources of Cr(Vl)
- Quantitative analysis of leather for Cr(Vl)
- Experimental
- Analytical methods
- Limitations of the Work
- Appendix 1
- Table 1 : Cr( Vl) content of leather neutralised with varying percentage of sodium bicarbonate
- Table 2 : Influence of ammonia treatment on Cr(VI) level
- Table 3 : Influence of a combined treatment of sodium bicarbonate and ammonia on Cr(VI) content of leather
- Table 4 : Combined influence of end pH and degree of neutralisation on Cr(VI) level
- Table 5 : Effect of sundrying on Cr(Vl) level in leatherEn ligne : https://drive.google.com/file/d/1TyR8jWoSKDAIavpNCkgruLbhW4nEk_TA/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40216
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 6 (11-12/2001) . - p. 211-216[article]