Le chromate dans le cuir. Enqûete sur la possible formation et le soin à éviter / Christiane Hauber in INDUSTRIE DU CUIR (IDC), N° 2014/01 (01-02/2014)

[article]  inINDUSTRIE DU CUIR (IDC) > N° 2014/01 (01-02/2014) . - p. 26-31 Titre : Le chromate dans le cuir. Enqûete sur la possible formation et le soin à éviter Type de document : texte imprimé Auteurs : Christiane Hauber, Auteur ; Heinz-Peter Germann, Auteur Année de publication : 2014 Article en page(s) : p. 26-31 Langues : Français (fre) Catégories : Cuir -- Teneur en chrome hexavalent Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Le tannage au chrome utilise des composants de chrome sous la forme de Cr(III). Du chromate (VI) a, cependant, été détecté occasionnellement dans des cuirs sans qu'aucune explication soit clairement apportée. Une recherche poussée sur la question a été réalisée et un aperçu de l'enquête et de ses résultats vous est apporté dans cet article. Note de contenu : - Détails de l'enquête - L'influence de la neutralisation - L'influence des agents humidifiants avant la teintes des croutes de cuir - L'influence du retannage végétal - L'influence des alcools gras - Les effets de l'acide oléique et d'autres variables - Les effets des agents de retannage et des alcools gras - Les effets du tara avec la combinaison de différents alcools gras - L'influence des différents types de tara - L'influence de l'entreposage - L'influence des procédés mécaniques - Résumé des résultats Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20494 [article]

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Chrome tannage from the viewpoint of ecology / Heinz-Peter Germann in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 79, N° 3 (05-06/1995)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 79, N° 3 (05-06/1995) . - p. 82-85 Titre : Chrome tannage from the viewpoint of ecology Type de document : texte imprimé Auteurs : Heinz-Peter Germann, Auteur Année de publication : 1995 Article en page(s) : p. 82-85 Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage En ligne : https://drive.google.com/file/d/1NSqGX_-weKenm7_jOqngUUIY3aGlyplf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8204 [article]

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Collagen thermal transitions in chrome leather - thermogravimetry and differential scanning calorimetry / Teresa Bosch in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 11 (11/2002)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 11 (11/2002) . - p. 441-450 Titre : Collagen thermal transitions in chrome leather - thermogravimetry and differential scanning calorimetry Type de document : texte imprimé Auteurs : Teresa Bosch, Auteur ; Heinz-Peter Germann, Auteur ; Hans-Jürgen Kellert, Auteur ; Agusti Marsal, Auteur ; Jaime Cot, Auteur ; Josep Carilla, Auteur ; Albert M. Manich, Auteur Année de publication : 2002 Article en page(s) : p. 441-450 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Thermal analysis of chrome bovine leather was performed by means of thermogravimetry (TGA) and differential scanning calorimetry (DSC). The glass-transition, the crystallisation and the denaturation temperatures of the collagen molecule within the leather matrix were measured. At low moisture content one single endothermic peak which corresponds to the denaturation process of leather and the evaporation of water was detected. At higher moisture contents two endothermic peaks were detected, the first one corresponding to denaturation and the second one to evaporation of water. The temperature of the low-temperature peak decreased as the water content increased. At much higher moisture content the low temperature peak maintained its temperature being equal to the shrinkage temperature of leather determined by the IUP-16 standard method. The glass transition of room-conditioned leather determined by DSC in sealed pans was approx. 45ºC. En ligne : https://drive.google.com/file/d/1OSRHz_EOt-pe-ehkSSADOHi9EFL35QBe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4244 [article]

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"Formaldehyde-free leather" - a realistic objective ? / Renate Meyndt in WORLD LEATHER, Vol. 18, N° 4 (06-07/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 4 (06-07/2005) . - p. 23-27 Titre : "Formaldehyde-free leather" - a realistic objective ? Type de document : texte imprimé Auteurs : Renate Meyndt, Auteur ; Heinz-Peter Germann, Auteur Année de publication : 2005 Article en page(s) : p. 23-27 Langues : Anglais (eng) Catégories : Cuir -- Teneur en formaldéhyde Cuirs et peaux -- Analyse Formaldéhyde Produits chimiques -- Consommation -- Réduction Vieillissement Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : There is an increasing demand for "formaldehyde-free" leather. No legal regulation presently exists for this chemical in the EU, but in many areas of application the amount of formaldehyde contained in leather is limited by technical specifications or eco-labels. Formaldehyde is used in large quantities as a starting material for the production of synthetic aromatic and resin-tanning agents. During the production of these compounds formaldehyde acts as a condensation agent, helping to develop larger molecules. The resulting condensation products have different levels of hydrolytic stability, so are potential sources of formaldehyde. In addition, some dyeing auxiliaries, fatliquors and finishing products are also able to release formaldehyde. However, high quality leather requirements cannot be met unless a wide range of tanning and retanning agents, dyeing auxiliaries and fatliquors are used. It therefore appears necessary to develop a leather-producing technology that meets high quality demands and guarantees a minimal risk of formaldehyde release from the finished product. Attempts to bind free and releasable formaldehyde in leather with scavenging compounds have been reported and the modification of some technological steps has also been investigated. However, another way to reduce the formaldehyde content of leather is to select the recipe components on the basis of their potential to release formaldehyde. Even so, an adequate analytical method to determine the free formaldehyde in tanning agents and auxiliaries had not been previously developed. Within this investigation the development and validation of such a method was therefore essential. Furthermore, it was important to take into account that the interaction between chemicals and the leather matrix might generate synergistic effects. Also the ageing process of leather could involve formaldehyde release. Finally, several compounds needed testing regarding their suitability as formaldehyde scavengers. Note de contenu : - A test method for the determination of free formaldehyde - Materials for assessment and scope of the investigation - The production of formaldehyde-free leather - The influence of product selection - Determination of free formaldehyde in tannins and auxiliaries - The production of formaldehyde-free leather - The influence of product selection - The influence of ageing - Panel 1 : The release and collection of formaldehyde from leather making products - Panel 2 : Free formaldehyde in different product classes - Panel 3 : Inorganic compound: effect of sodium disulphite (chrome tanned leather) - Panel 4 : Inorganic compound : effect of Auxiliary A (chrome tanned leather) - Panel 5 : Organic compound: effect ofAuxiliary B (chrome tanned leather) - Panel 6 : Efficiency of the tested scavengers (VDA 275, chrome tannage) - Panel 7 : Development of recipes for low formaldehyde release (chrome tannage) - Panel 8 : Development of recipes for low formaldehyde release (chrome-free tannage) - Panel 9 : Artificial ageing parameters - Panel 10 : Results of artificial ageing experiments on chrome tanned leather - Panel 11 : Results of artificial ageing experiments on chrome-free leather - Panel 12 : Chrome tanned leather : Variation of formaldehyde content during storage - Panel 13 : Chrome free leather : variation of formaldehyde content during storage En ligne : https://drive.google.com/file/d/1_OebkuER7Ocv7ObV5t4-vhLMPJrsUl1a/view?usp=drive [...] Format de la ressource électronique : pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32463 [article]

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Low temperature conversion of tannery sludges / G. E. Renner in WORLD LEATHER, Vol. 15, N° 3 (05/2002)  

[article]  inWORLD LEATHER > Vol. 15, N° 3 (05/2002) . - p. 45-48 Titre : Low temperature conversion of tannery sludges Type de document : texte imprimé Auteurs : G. E. Renner, Auteur ; H. J. Renner, Auteur ; Heinz-Peter Germann, Auteur Année de publication : 2002 Article en page(s) : p. 45-48 Langues : Anglais (eng) Catégories : Basses températures Boues résiduaires Cuirs et peaux -- Industrie Déchets industriels -- Elimination Traitement thermique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : As part of the treatment of leather tanning industry effluents, waste water treatment sludges are generated. In June, 2005, new German landfill regulations (TA Siedlungsabfall) will come into force which limits the organic content of disposable waste. Consequently wastes will have to be thermally treated prior to landfilling. Tannery sludges contain non-toxic Cr(III), but when burning these residues partial oxidation to the toxic Cr(VI) occurs. A method is therefore required to avoid this oxidation. As part of a co-operative research project supported by the BMBF (Federal Ministry for Education and Research) and a German-Brazilian environmental programme, LGR has tested the low temperature conversion on leather industry sludges in an integrated pilot plant. A particular objective was that no Cr(VI) should be produced across the process. Note de contenu : - The integrated pilot plant - Operational Data - Reaction products of low temperature conversion - Heat content of the conversion products - Energy balance - Evaluation of the results - Fig. 1 : Direct flue gas dryer - Fig. 2 : Conversion system with two converters - Fig. 3 : Conversion yield - biolog. treatment sludge - Fig. 4 : Conversion yield - phys./chem. treatment sludge - Fig. 5 : The influence of organic matter and temperature on oil obtained - Fig. 6 : LTC-Product - Char - Fig. 7 : Reduction of substances in the eluate of solid wastes for disposal - Fig. 8 : LTC-Product - Oil - Fig. 9 : LTC-Product - Oil - Fig. 10 : LTC-Product - Reaction water - Fig. 11 : LTC-Product - Reaction water En ligne : https://drive.google.com/file/d/11kTLmtg2bBvXxEHTCs_ZwOaZ6qvZdoOR/view?usp=drive [...] Format de la ressource électronique : pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32220 [article]

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A natural plant crosslinker from olive waste for leather tanning / Stefan Marx in INDUSTRIE DU CUIR (IDC), N° 2012/01 (01-02/2012)

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Procter memorial lecture 2008. The ecological tannage - Challenges and progress / Heinz-Peter Germann in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 6 (11-12/2008)  

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Study of a chrome tanning process without float and with low-salt content as compared to a traditional process. Part II / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 12 (12/2006)  

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Study of a chrome tanning process without float and with low-salt content compared to a traditional process. Part I / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 7 (07/2006)  

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The 1997 John Arthur Wilson memorial lecture : The evolution of the unhairing process as influenced by technological, economic and ecological considerations / Heinz-Peter Germann in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCII, N° 4 (04-05/1997)  

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The physical-chemical treatment of tannery effluents / Heinz-Peter Germann in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 79, N° 3 (05-06/1995)  

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The role of post tanning processes on the embossing properties of upholstery leathers / K. O. Schoppe in WORLD LEATHER, Vol. 14, N° 8 (12/2001 - 01/2002)  

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