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Effects of vacuum drying variables on the mechanical properties of leather / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 7 (07/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 7 (07/2001) . - p. 243-254 Titre : Effects of vacuum drying variables on the mechanical properties of leather Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Gary L. DiMaio, Auteur Année de publication : 2001 Article en page(s) : p. 243-254 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Due to its fast drying speed, vacuum drying has become one of the most popular drying methods in recent years for leather manufacture. However, information regarding how drying conditions affect the resulting leather mechanical properties is lacking. Without this information, drying operations often produce leather with poor mechanical properties. Therefore, we conducted a systematic vacuum drying study to gain a clear picture of how drying variables affect the mechanical properties of vacuum-dried leather. Data clearly indicate that a lower drying temperature, shorter drying time, and proper initial water content in leather are favorable conditions to produce stronger and softer leather. In this investigation we not only formulate the relationship between drying factors and mechanical properties, but also explore the possibility using a mass transfer quantity such as drying rate to generalize the complex relationship between drying variables and resultant mechanical properties. Observations showed that the rate of drying is one of key factors that governs the tear strength. This investigation may benefit the leather industry in optimizing drying conditions to obtain improved mechanical properties. En ligne : https://drive.google.com/file/d/1jC0uJ8b0JslmVpIWOUFYmtkscjj06JIe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4367 [article]

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Strategic technical process design and competitive advantage enhancement techniques / Rumon A. Hankey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 7 (07/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 7 (07/2001) . - p. 255-261 Titre : Strategic technical process design and competitive advantage enhancement techniques Type de document : texte imprimé Auteurs : Rumon A. Hankey, Auteur Année de publication : 2001 Article en page(s) : p. 255-261 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the dynamic environment of a globalized economy, customer-focused organisations, which have successfully developed strategies of growth, high market-share and differentiation are in a position to compete profitably and grow stakeholder value. Delivering results within this type of business strategy for the Leather Industry requires an equivalent highly developed Technical Innovation and Production Control Strategy. International Organisations can become more profitable by having a solid foundation to strategic technical process design to obtain competitive advantage. Successful achievement of which allows businesses to adequately design and successfully implement robust processes to consistently deliver high-performance quality products, with fast response times, cost-effectively to meet their customers' needs. En ligne : https://drive.google.com/file/d/1D35ZUHfYOguAOJODo5a4glwIPu9uaZUD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4368 [article]

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Modified collagen hydrolysate, potential for use as a filler for leather / Wuyong Chen in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 7 (07/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 7 (07/2001) . - p. 262-267 Titre : Modified collagen hydrolysate, potential for use as a filler for leather Type de document : texte imprimé Auteurs : Wuyong Chen, Auteur ; Peter H. Cooke, Auteur ; Gary L. DiMaio, Auteur ; Maryann M. Taylor, Auteur ; Eleanor M. Brown, Auteur Année de publication : 2001 Article en page(s) : p. 262-267 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Partially hydrolyzed collagen, previously extracted from chromium-containing leather waste, in which more than 50% of the fragments had molecular weights less than 21 kDa, was chemically modified with glutaraldehyde (0 to 18%). Glutaraldehyde, even at low concentration (6%), formed intermolecular crosslinks, as evidenced by a shift in the molecular weight distribution to higher weights. The 12% glutaraldehyde-hydrolysate protein (12% GHP) was used in a demonstration of leather filling. 12% GHP adhered better to chrome tanned calfskin from both back and flank areas than did 0% glutaraldehyde-hydrolysate (HP). To visualize the filling effect, 12% GHP and HP were labeled with a fluorescent dye, and treated leather samples evaluated by fluorescence microscopy. The results suggested a potential for this material as a filler for leather, but were difficult to interpret clearly. To better utilize the sensitivity of fluorescence techniques, additional experiments were performed using a low quality recovered gelatin (90 Bloom; more than 50% of the fragments had molecular weights less than 50 kDa). Gelatin was fluorescently labeled prior to crosslinking. Microscopy showed that in samples treated with 0% glutaraldehyde-gelatin, the fluorescence was localized on the inner surface of veins, whereas with 0.5% glutaraldehyde-gelatin the fluorescence filled the entire cross section of the vein. The results suggest that with appropriate treatment, the small fragment-proteinaceous material recovered from solid leather waste could be used in further leather production. En ligne : https://drive.google.com/file/d/1v4N2bVNaolS3DkQlyohVh1TBzum5k2se/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4369 [article]

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Evaluation of urea sulfate as a replacement for sulfuric acid in chrome tanning / Andrew G. Gehring in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 7 (07/2001)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVI, N° 7 (07/2001) . - p. 268-274 Titre : Evaluation of urea sulfate as a replacement for sulfuric acid in chrome tanning Type de document : texte imprimé Auteurs : Andrew G. Gehring, Auteur ; David G. Bailey, Auteur ; Gary L. DiMaio, Auteur Année de publication : 2001 Article en page(s) : p. 268-274 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Concentrated sulfuric acid is a noxious and corrosive chemical that must be handled with extreme care by workers in the leather tanning industry. A safe alternative to sulfuric acid in the chrome tanning process would be desirable if the alternative was demonstrated to be an equally efficient replacement. Small steer hide pieces (unhaired and bated) were treated with either sulfuric acid or urea sulfate, converted into leather, and physically tested in a laboratory bench scale study. Large hide pieces (unhaired and bated matched sides) were chrome-tanned in a pilot plant, again to compare sulfuric acid with urea sulfate. This paper documents that physical testing (hide swelling, shrinkage temperature, stress/strain, quantification of chromium uptake) results exhibited no remarkable difference between either the sulfuric acid or urea sulfate treated hide pieces. These results demonstrate that urea sulfate would be an acceptable alternative for sulfuric acid should circumstances (economic, legally mandated environmental protection issues, safety, etc.) warrant it. En ligne : https://drive.google.com/file/d/1F1ORzM0qgm5ym_zHKOU_ZI4Fjq9TF5m1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4370 [article]

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