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Whey protein isolate : a potential filler for the leather industry / Eduard Hernàndez Balada in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 4 (04/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 4 (04/2009) . - p. 122-130 Titre : Whey protein isolate : a potential filler for the leather industry Type de document : texte imprimé Auteurs : Eduard Hernàndez Balada, Auteur ; Cheng-Kung Liu, Auteur ; Eleanor M. Brown, Auteur ; Maryann M. Taylor, Auteur ; Jaume Cot Année de publication : 2009 Article en page(s) : p. 122-130 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The upgrading of leather that presents loose areas and poor grain break is one of the most value adding opportunities for a tanner. Typically, petroleum-based products are used to improve the final appearance and feel of crust leather. In this study, we demonstrate that blends composed of whey protein isolate (WPI), a byproduct of the cheese industry, and small amounts of gelatin, a byproduct of the leather industry, could be effectively used as filling agents for both shoe upper and upholstery leather. Wet blue leather from three different areas in the hide (butt, belly and neck) was treated with the WPI-gelatin blend, retanned, colored and fatliquored, and their subjective and mechanical properties evaluated. The effect of pretreatment of the wet blue samples with various concentrations of the enzyme microbial transglutaminase (mTGase) was also examined. It was found that the rate of uptake of the WPI-gelatin blend by upholstery wet blue increased four-fold when it was pretreated with a 2.5% mTGase solution. Conversely, this rate was decreased when shoe upper was pretreated with increasing amounts of mTGase. The subjective properties (e.g. handle, fullness, color and grain break) of both shoe upper and upholstery leather that were treated with the WPI-gelatin blend were significantly improved over the controls. Importantly, the grain break of the belly area of samples that were pretreated with enzyme (both upholstery and shoe upper) was remarkably improved. Hence, fillers mainly composed by the less expensive WPI were demonstrated to be effective filling agents for both upholstery and shoe upper leather. En ligne : https://drive.google.com/file/d/1EMtJdplpyAfC500s_wozq1UnuV9TN3be/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4805 [article]

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Composite drying with simultaneous vacuum and toggling / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 4 (04/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 4 (04/2009) . - p. 131-138 Titre : Composite drying with simultaneous vacuum and toggling Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Liu Linshu, Auteur ; Nicholas P. Latona, Auteur ; Neil M. Goldberg, Auteur ; Peter H. Cooke, Auteur Année de publication : 2009 Article en page(s) : p. 131-138 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Drying is one of key steps to govern the physical properties of leather and it is where leather acquires its final texture, consistency and flexibility. Recently we have been working diligently to improve chrome-free leather by optimizing its drying process. We developed a drying method using a combination of toggle and vacuum drying together. This is because vacuum drying offers fast speed at a low temperature, which is particularly advantageous to heat-vulnerable chrome-free leathers. On the other hand, adding a toggle action during vacuum drying can significantly increase the area yield. We explored this composite drying method and investigated how drying variables affect mechanical properties and area yield of chrome-free leather. This study showed that the stretch applied in a drying operation significantly affects stiffness and area yield. We also observed that biaxial stretch increases tensile strength but has less effect on fracture energy. Our study also showed that tensile strength increases with apparent density and decreases with drying rate. Under an optimal drying condition, a 16% increase in area yield with good properties can be achieved. En ligne : https://drive.google.com/file/d/1IP_KXJiCVd69R_bbcNpNEo3BccKiNcG7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4806 [article]

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Waste water reutilization in the leather industry using membrane technology / J. Roig in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 4 (04/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 4 (04/2009) Titre : Waste water reutilization in the leather industry using membrane technology Type de document : texte imprimé Auteurs : J. Roig, Auteur ; Joaquim Font, Auteur ; X. Marginet, Auteur ; M. Jorba, Auteur ; Lluis Ollé, Auteur ; Anna Bacardit, Auteur ; Rita Puig, Auteur Année de publication : 2009 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This paper documents a technical feasibility study of tannery wastewater which was reclaimed (treated) and reutilized in tannery leather making processes. The studied waste water was processed in the waste water treatment plant owned by Igualada tanners (IDR), in Spain. The objectives included reduction of city fresh water consumption by the tanners of this city. A pilot plant using membrane technology, determined to be the most appropriate technology in this case, was installed at the IDR wastewater treatment facility. It worked in three consecutive stages : pre-treatment by sand filtration, subsequent ultrafiltration, and then reverse osmosis. The reclaimed water was of the highest quality, superior to any other water currently available to city tanners. The right sides of 24 calf hides were fully processed with the reclaimed water, while the left sides of the same hides were processed with softened tap water. Three different leather articles were produced. No significant differences were detectable between the left and right sides, neither organoleptically nor analytically. En ligne : https://drive.google.com/file/d/1QE82tggKZBBH7WjgwGV7Jq_i1-pTFhh9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4807 [article]

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Modification of collagen for high Cr(III) adsorption / Zhaoyang Luo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 4 (04/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 4 (04/2009) . - p. 149-155 Titre : Modification of collagen for high Cr(III) adsorption Type de document : texte imprimé Auteurs : Zhaoyang Luo, Auteur ; Bi Shi, Auteur ; Yuansen Liu, Auteur ; Haojun Fan, Auteur ; Zhang Xiuli, Auteur Année de publication : 2009 Article en page(s) : p. 149-155 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Collagen has an ability to coordinate with chromium (III) salts which is mostly determined by the amount of pendent carboxyl groups on the backbone of collagen. Based on this principle, when an oxazolidine derivative which contains carboxyl group and oxazolidine rig was sinthesized and used as a modification agent, a novel collagen fiberbased high Cr (III) adsorption material was developed. In contrast to unmodified collagen fiber, the hydrothermal stability of the modified collagen fiber increased from 63.1°C to 78.8°C and the maximum adsorption capacity (A max) of Cr3+ increased from 41mg/G(Cr3+/collagen) with a pH value of 4.0. In the waste water from a leather tannery treated with the modified collagen fiber, the Cr2O3 content decreased from 1.76/L to 0.06g/L. Investigation of high chromium adsorption mechanism indicates that the increased number of carboxyl groups attached to the backbone of collagen and the intrinsic carboxyl groups of collagen coordinate together with chromium (III) and form ui- or multi-point bound chromium complexes, which seems to contribute to the modified collagen high chromium (III) adsorption. En ligne : https://drive.google.com/file/d/17DaW2SoRgqBhQl4fw1JbOeE-PabaVk-2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4808 [article]

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