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675.2 : Préparation du cuir naturel. Tannage |
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CO2 Deliming / Michael J. Klaasse in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXV (Année 1990)
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Titre : CO2 Deliming Type de document : texte imprimé Auteurs : Michael J. Klaasse, Auteur Année de publication : 1990 Article en page(s) : p. 431-441 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Increasing environmental pressures are forcing tannery to reduce the level of nitrogenous compounds in their effluent. A substantial portion of this problem is due to the use of ammonium compounds for deliming. An environmentally friendly method of deliming using gaseous CO2 can greatly reduce or, in some cases, completely eliminate the use of ammonium salts.
This paper details the development of the CO2 deliming process. It draws upon experience gained through extensive lab drum testing as well as full-scale drum and mixer operations. It focuses on :
1) the chemistry of CO2 deliming ;
2) advantages versus conventional deliming methods ;
3) implementation techniques ;
4) the effects of process parameters (e.g. temperature), and ;
5) controlling hydrogen sulfide formation.
At least 11 tanneries in the United States and Europe are currently using the CO2 deliming process. This proven technology offers considerable benefits over conventional deliming techniques and can be economically incorporated into the operations of most tanneries.En ligne : https://drive.google.com/file/d/1uCY4x6shV4wR9GmGMf9DlkW_9dwJDC5m/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8821
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Code-barres Cote Support Localisation Section Disponibilité 008090 - Périodique Bibliothèque principale Documentaires Disponible Collagen and polyphenols : new relationship and new outcomes. Part 1. Flavonoid reactions for new tanning processes / Anthony D. Covington in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 9 (09/2005)
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Titre : Collagen and polyphenols : new relationship and new outcomes. Part 1. Flavonoid reactions for new tanning processes Type de document : texte imprimé Auteurs : Anthony D. Covington, Auteur ; L. Song, Auteur ; T. H. Lilley, Auteur Année de publication : 2005 Article en page(s) : p. 325-335 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The process of vegetable tanning is hindered by the astringency of the tannins, which affects the development of their use as organic tanning agents for modern purposes. The use of non tans, either from natural sources such as green tea or by degrading tannins into non tannins, avoids the problem of hindered penetration through pelt due to the high reactivity of the polyphenols. Both tannins and non tannins are capable of engaging in combination tannage with aldehydic agents, to confer high hydrothermal stability to collagen. The use of prodelphinidin or prorobinetinidin polyphenols, characterized by the presence of a pyrogallol B-ring, is preferred in this context. Also, the use of non tannins provides a practical route to modem organic tanning. En ligne : https://drive.google.com/file/d/15iPRhEGaqXGcbGEUN68FWrIxyzBvussz/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4054
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Code-barres Cote Support Localisation Section Disponibilité 003081 - Périodique Bibliothèque principale Documentaires Disponible Collagen and polyphenols : new relationships and new outcomes. Part 2. Phenolic reactions for simultaneous tanning and coloring / Anthony D. Covington in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 9 (09/2005)
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Titre : Collagen and polyphenols : new relationships and new outcomes. Part 2. Phenolic reactions for simultaneous tanning and coloring Type de document : texte imprimé Auteurs : Anthony D. Covington, Auteur ; Ono Suparno, Auteur ; T. H. Lilley, Auteur ; C. S. Evans, Auteur Année de publication : 2005 Article en page(s) : p. 336-343 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Polyphenols are the basic building blocks of natural skin and hair pigments: they can be polymerised to create versions of natural black, brown and orange melanins. These reactions can be catalysed by laccase: not only dothey create colour, but also, if they are conducted in the presence of collagen, the resulting pigment is bound to the leather in a covalent tanning manner. Therefore, the leather becomes coloured by a lightfast pigment, which is firmly fixed. It has not proved possible to create a pure black, but earth shades from green to brown/black are easily produced. It appears to be a feature of this type of stabilising mechanism for collagen, the creation of a polyphenol matrix around the triple helix, that it has the added benefit of actually strengthening the leather. Since every traditional process step effectively weakens collagen, especially tanning, this is the first chemical reaction that has been shown to reverse that effect. En ligne : https://drive.google.com/file/d/1Sex4BZgd7gbc5qBoke0HQi9MOb0bDntG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4055
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Code-barres Cote Support Localisation Section Disponibilité 003081 - Périodique Bibliothèque principale Documentaires Disponible Collagen crosslinking : new binding sites for mineral tannage / Neil A. Evans in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXII (Année 1987)
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Titre : Collagen crosslinking : new binding sites for mineral tannage Type de document : texte imprimé Auteurs : Neil A. Evans, Auteur ; Brian Milligan, Auteur ; K. C. Montgomery, Auteur Année de publication : 1987 Article en page(s) : p. 86-95 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Treatment capable of covalently binding aromatic 1,2-dicarboxylic acids to collagen are described. Aluminium tannage of the modified collagen produces white leather with good thermal and dyebath stability, in contrast to that produced by similar tannage of unmodified collagen. However, the treatment also results in excessive swelling and reduced dye affinity.
The aromatic 1,2-dicarboxylic acid groups also act as strong binding sites for chromium, but not for titanium or zirconium. The shrinkage temperature of the modified collagen, after chrome tannage, is exeptionally high, whereas the thermal stability after titanium or zirconium tannage is little different from that attained by similar tannage of untreated collagen.En ligne : https://drive.google.com/file/d/13Q8bXdCYpE9NzEThZ7FUXozmPVsluK7Y/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8984
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Code-barres Cote Support Localisation Section Disponibilité 008087 - Périodique Bibliothèque principale Documentaires Disponible Collagen hydrolysate : Soluble skin applied in post-tanning processes : Part 2 - Interaction with acyrlic retanning agents / Carlos S. Cantera in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 5 (09-10/2002)
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Titre : Collagen hydrolysate : Soluble skin applied in post-tanning processes : Part 2 - Interaction with acyrlic retanning agents Type de document : texte imprimé Auteurs : Carlos S. Cantera, Auteur ; J. Martegani, Auteur ; G. Esterelles, Auteur ; Jorge A. Vergara, Auteur Année de publication : 2002 Article en page(s) : p. 195-202 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : acrylique, Acide L'acide acrylique ou acide acroléïque ou acide prop-2-énoïque est un composé organique de formule brute C3H4O2 et de formule semi-développée CH2=CHCOOH. C'est un acide carboxylique et un alcène vinylique, et se présente comme un liquide incolore à l'odeur âcre.
L'acide acrylique et ses esters, les acrylates, sont utilisés dans la fabrication de matières plastiques, dans les peintures acryliques et dans divers autres polyacryliques qui ont de multiples usages.
Agents de tannage
Copolymères
Cuir pleine fleur
Cuirs et peaux de bovins
Hydrolysat de collagène
Post-tannage
Tannage synthétiqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In the upgrading of tannery solid wastes, the commercial application of the by-products obtained is the key to attractive technological alternatives.
In the particular case of chrome shavings hydrolysed by an alkaline-enzyme process, the uses of collagen hydrolysate (CH) are the driving force for the start-up of a project when consideration is given to the amounts generated and to the diversity of applications, in addition to the fact that basic chrome salts -obtained from the dissolution of the chrome cake - may be used as trouble-free assistants to the fresh tanning agent.
The present paper, which follows the Part I of this study ; "Collagen Hydrolysate : ‘soluble skin’ applied in post-tanning processes I. Characterisation” (JSLTC, 2000, 84,29) shows the experimental results obtained from the manufacture of various types of bovine leathers carried out at the CITEC pilot plant and in tanneries using CH in the post-tanning processes. In addition, the interactions of CH with acrylic retanning agents, studied at laboratory scale, are included.
CH performs in a synergistic fashion with various retanning agents. In addition to its cosmetic-lubricating effect which enhances the leather grain properties and provides greater softness improving the resistance of the fibrous tissue, there is also a ‘restoring effect’ upon the grain surface of the semi-finished leather, masking preservation defects and damage marks on the skin. The interaction with dyes is evident from the intensified colours and improved homogeneity of the dyeing.
CITEC has developed, besides CH, a copolymer CH-acrylic acid : "acrylic-protein" retanning agent MCH-106, that shows good properties in the development of full grain leather and splits. The application of the CH and the acrylic-protein MCH-106 in processing full-grain leather generates leathers of similar or higher quality to the standard one.
The application of CH in leather manufacture is an attractive response to the question of how to use the by-products derived from the treatment of the chrome shavings.Note de contenu : - EXPERIMENTAL DEVELOPMENT : Experiments at CITEC
- ANALYSIS OF THE RESULTS : CH application trials at the tannery
- Table 1 : Reduction in formic acid consumption in the 'mixture solutions' With regard to the sum of the individual values (expressed in %)
- Table 2 : Reduction in the salt KCr (SO4)2.12H2O consumption in the ‘mixture solutions’ with regard to the sum of the individual values (expressed in %)
- Table 3 : Physical properties of the upper leather prepared with acrylic-protein retanning agent MCH106 and CHEn ligne : https://drive.google.com/file/d/1ApP8ftPrxBi4iuQPgF3ZwC9qWN4r9ckE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39859
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 5 (09-10/2002) . - p. 195-202[article]Collagen recovered, purified and enzymatically hydrolysed from tannery waste / M. E. Errasti in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 1 (01-02/2024)
PermalinkColoring of side leather / Bruce Sharp in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)
PermalinkCombination of white minerals with natural tannins : chrome-free tannage for garment leathers / Subramanian Saravanabhavan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 2 (03-04/2004)
PermalinkA combination tannage based on aluminium and glycine-modified lignosulfonate / Zhou Jian in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 5 (09-10/2011)
PermalinkCombination tannage of tannic acid and rare earth / Shan Zhihua in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 2 (03-04/2004)
PermalinkCombination tannage with vegetable and aluminium salts : glace kid for ladies shoe uppers / E. Gratacos in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 77, N° 6 (11-12/1993)
PermalinkCombination tannages / F. F. Miller in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 54, N° 8 (08/1970)
PermalinkCombination tanning based on tara : an attempt to make chrome-free garment leathers / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 6 (06/2007)
PermalinkCombination tanning based on tara-sodium metasilicate a new tanning / Getaneh Andualem / Saarbrücken [Germany] : Lambert Academic Publishing (2017)
PermalinkCombination tanning mechanism inspired environmentally benign catalyst for efficient degradation of tetracycline / Meng Xiao in COLLAGEN AND LEATHER, Vol. 5 (2023)
PermalinkCombined organic tanning based on mimosa and oxazolidine : development of a semi-industrial scale process for high-quality bovine upper leather / A. d'aquino in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 2 (03-04/2004)
PermalinkPermalinkComparative evaluation of deliming by the EPA (Koopman) Epsom salts and ammonium sulfate process / James M. Constantin in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
PermalinkComparative study of glucose and sulfur dioxide reduced chrome powders / Ding Xiaoliang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 1 (01-02/2019)
PermalinkComparative study of life cycle asessment of tanning processes based on efootprint / Fan Shan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 2 (03-04/2024)
PermalinkComparative study of retanning properties of melamine-glyoxal resins produced by different sulfonating agents / Muhammad Naveed Ashraf in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 5 (09-10/2022)
PermalinkComparative tanning ability of extracts from four north american species of acacia / David. S. Seigler in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)
PermalinkComparison of efficiencies and costs of chromium recovery methods / Hikmet Toprak in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 11 (11/1994)
PermalinkA comparison of low temperature softness of leather lubricated with various types of fatliquor / Zhengjun Li in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 4 (07-08/2014)
PermalinkComparison of one-bath and two-bath unhairing systems / David A. Boast in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)
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