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Closed loop for chromium in tannery operation / Karel Kolomaznik in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 12 (12/2003)
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Titre : Closed loop for chromium in tannery operation Type de document : texte imprimé Auteurs : Karel Kolomaznik, Auteur ; Maryann M. Taylor, Auteur ; Dennis C. Shelly, Auteur ; F. Langmaier, Auteur ; Milan Mladek, Auteur Année de publication : 2003 Article en page(s) : p. 487-490 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Even though the leather industry is environmentally important as a user of a byproduct of the meat industry, it is still perceived as a consumer of resources and a producer of pollutants. When processing one metric ton ofrawhide, 200 kg of a leather-final product is obtained, and only 20% of the raw material weight is converted to leather. The biggest problem, and one that is now under scrutiny, is the disposition of chrome-tanned solid wastes. To keep the chromium from tanned wastes within control limits we have worked out a modified enzymatic dechromation technology and developed it into an industrial scale with a daily capacity of three metric tons of chrome shavings. The chromium-containing sludge, isolated by this technology, contains 10-15% magnesium oxide, and is used (here) as a precipitator for chromium in spent tanning liquor. We treated a spent liquor containing 2294 ppm of chromium with the chromium sludge, obtained from the enzymatic reaction. After the treatment, the content of chromium decreased from the original 2294 ppm to 6 ppm, which means that practically total dechromation of the waste chrome water has occurred. This chrome removal from the spent tanning liquor, using the chrome sludge from digestion of the chrome-tanned solid wastes, effectively provides a closed loop for chromium in tanning operations. En ligne : https://drive.google.com/file/d/1WJKf1eo9Vp5pwBgM-FilabOY9odb4alH/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4170
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 12 (12/2003) . - p. 487-490[article]Réservation
Réserver ce documentImmobilization of degradative enzyme onto collagen hydrolysate films / C. Shanthi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 1 (01/2003)
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Titre : Immobilization of degradative enzyme onto collagen hydrolysate films Type de document : texte imprimé Auteurs : C. Shanthi, Auteur ; B. Stennett, Auteur ; Dennis C. Shelly, Auteur Année de publication : 2003 Article en page(s) : p. 6-12 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Chemical or biological degradation of chrome shavings results in collagen hydrolysate and chrome cake. To add value to the recovered collagen hydrolysate, we evaluated films, cast from this material, for immobilizing degradative enzymes. Organophosphorus hydrolase (OPH) has been shown to be effective in degrading a range of organophosphate esters. Organophosphate compounds, which are among the most toxic substances known, are used as pesticides and nerve gases. A crude extract of OPH from Flavobacterium sp. was immobilized onto collagen hydrolysate films. The collagen films were characterized by differential scanning calorimetry and water swelling behavior. The properties of the collagen hydrolysate films were compared with the films cast from commercially available gelatin. The effect of glutaraldehyde crosslinking the films on enzyme immobilization was studied. En ligne : https://drive.google.com/file/d/1aadJYItST3tLeKrZ4FFUFYUjmlSThrc-/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4089
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 1 (01/2003) . - p. 6-12[article]Réservation
Réserver ce documentInfluence of retanning of the adsorption capacity of water on cattlehide collagen fibers / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 11 (11/2009)
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Titre : Influence of retanning of the adsorption capacity of water on cattlehide collagen fibers Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Dominick J. Casadonte, Auteur ; Dennis C. Shelly, Auteur ; Jie Liu, Auteur ; Ming Yang, Auteur ; Xuejing Zheng, Auteur Année de publication : 2009 Article en page(s) : p. 367-374 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption
Collagène
Cuirs et peaux
TannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : There are an abundance of hydrophilic groups in the collagen fibers in leathers. Because the affinity between these hydrophilic groups and water molecules varies with changes in temperature and relative humidity, leathers will adsorb or de-adsorb water as these factors change; affecting strength, permeability, and thermal stability. Retanning is a key operation in leather making with the purpose of retanning is to obtain leathers with some special characteristics. The water content in leathers, often 15-20 wt%, is an amount that cannot be neglected. However, few reports are found on the interactions between collagen and water, particularly the influence of retanning on the interaction between water and collagen fibers. The state that water molecules exist in collagen fibers, the mechanism for collagen fibers to adsorb water, the de-adsorption kinetics for water molecules to escape from collagen fibers, and the influence of retanning on the adsorption of water on collagen fibers need to be studied to improve the leathermaking technology for controlling the structure and behaviors of leathers. In this study, after being chrome tanned, collagen fibers were retanned with chrome, glutaraldehyde, TGR retanning agent (proprietary acrylic based), and wattle extract, respectively, to obtain different retanned samples. The water adsorption isotherms of the samples were determined by using a gravimetric method, by which the influence of retanning on the equilibrium water adsorption capacity and the influencing mechanism were evaluated. Different retanned samples varied in water adsorption characterization and equilibrium adsorption capacity. The TGR retanning increased the equilibrium adsorption capacity, while glutaraldehyde retanning decreased it; likely related to differences in retanning mechanisms. For different relative humidity environments, leathers should be retanned with different retanning agents to get an optimum property. Based on the adsorption characterization and the equilibrium adsorption capacity for the samples, different mathematics models were used to describe the adsorption process and the adsorption mechanism. Six models were chosen to fit the experimental data, and it was found that the Bradley model was the best to describe the adsorption. En ligne : https://drive.google.com/file/d/1Rv1WvrffcvoLu3ITj9Od-y-F5wT4O2l2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6385
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 11 (11/2009) . - p. 367-374[article]Réservation
Réserver ce documentInfluence of test length on the observed tensile properties of upholstery leather : Relation to weak link theory / Palanisamy Thanikaivelan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 1 (01/2007)
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Titre : Influence of test length on the observed tensile properties of upholstery leather : Relation to weak link theory Type de document : texte imprimé Auteurs : Palanisamy Thanikaivelan, Auteur ; K. Krishnaraj, Auteur ; B. Chandrasekaran, Auteur ; Dennis C. Shelly, Auteur ; S. Ramkumar, Auteur Année de publication : 2007 Article en page(s) : p. 10-15 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Maximum load and percentage extension at break are the two most important mechanical properties of leather. They influence the performance and end-use applications of leather materials. An experimental investigation on the influence of testing lengths on the aforementioned mechanical properties of upholstery leather has been undertaken using rectangular and dumbbell shaped specimens in parallel and perpendicular directions to the backbone of upholstery leather. Results show that the measured tenacity and percentage extension values exhibit a decreasing trend with increase in test lengths. The experimental study on the influence of testing lengths on the observed tensile load and percentage extension at break is important from both fundamental and applied points of view. More importantly, it will enable the setting up of test methods and help with the quality control procedures in the leather industry. En ligne : https://drive.google.com/file/d/105Nup4Bu643ByGXZoF7XBGAeRuwLL8lB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3372
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 1 (01/2007) . - p. 10-15[article]Réservation
Réserver ce documentModification and application of aminosiloxane in fatliquoring / Keyong Tang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)
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Titre : Modification and application of aminosiloxane in fatliquoring Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Ren Bin, Auteur ; Qin Shufa, Auteur ; Xuejing Zheng, Auteur ; Dennis C. Shelly, Auteur Année de publication : 2009 Article en page(s) : p. 217-221 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Amino silicone oil was modified with the acetic anhydride to produce a fatliquoring system that yields excellent flexibility, smoothness and elasticity in the finished leathers. The effect of reaction conditions on amino conversion was studied. Results indicate that a 50 %, the reaction temperature was 50-55°C, and the reaction time was 1.5 hours. The treated leathers showed good fullness, softness, elasticity and had a silky feeling. Both the tensile strength and tearing strength of these leathers were improved (6,73 % and 2,88 %, respectively), and the elongation at break and hydrothermal shrinkage temperature were greatly improved by 30,82 % and 10°C, respectively. En ligne : https://drive.google.com/file/d/1-0MGPTWk0DRx7hGS4oOkWK3kxBRlK8rr/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7290
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 6 (11-12/2009) . - p. 217-221[article]Réservation
Réserver ce documentModification of polyurethane finishing agent using collagen hydrolysate from chrome shavings / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 1 (01/2010)
PermalinkMolecular modeling approach to vegetable tanning : Preliminary results for gallotannin interactions with the collagen microfibril / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 5 (05/2011)
PermalinkMultidimensional analysis of magnesium oxide hydrolysis of wet-blue shavings / Kalyani Martinelango in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 6 (06/2004)
PermalinkNovel titanium (IV) tanning for leathers with superior hydrothermal stability / Biyu Peng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 9 (09/2007)
PermalinkNovel titanium (IV) tanning for leathers with superior hydrothermal stability / Biyu Peng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 10 (10/2007)
PermalinkPerformance evaluation of pelts and leather from domestic hair sheep crossbreeds / Dennis C. Shelly in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 6 (06/2009)
PermalinkPreparation and properties of polyurethane finishing agent using butylamine as chain-extension agent / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 9 (09/2009)
PermalinkQualitative and quantitative studies of various leather types using X-Ray fluorescence spectrometry / Dennis C. Shelly in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 6 (06/2008)
PermalinkRaman spectroscopy of wet blue bovine leather / Dennis C. Shelly in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 1 (01/2009)
PermalinkSampling strategies for infrared spectroscopic studies of raw, pickled, and in-process chrome tanned bovine hides / Dennis C. Shelly in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIV, N° 8 (10/1999)
PermalinkStudies on mono and divalent cations effects on hair immunization / Domenico Castiello in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 11 (11/2007)
PermalinkThermal shrinkage effects on the mechanical behavior of leathers / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 3 (03/2010)
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