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JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) . Vol. CIV, N° 10Mention de date : 10/2009Paru le : 06/11/2009 |
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Ajouter le résultat dans votre panierTreatment of low-quality hides with fillers produced from sustainable resources : effect on properties of leather / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 10 (10/2009)
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Titre : Treatment of low-quality hides with fillers produced from sustainable resources : effect on properties of leather Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; Joseph Lee, Auteur ; Lorelei P. Bumanlag, Auteur ; Peter H. Cooke, Auteur ; Eleanor M. Brown, Auteur Année de publication : 2009 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Prior research from this laboratory reported on the use of gelatin, alone or in combination with dairy byproducts (casein or whey), as a filler for leather. It was found that all these treatments had fully penetrated the blue stock, were not removed during washing, and had no significant effect on mechanical properties when compared to untreated controls, but did show improvements in the subjective evaluations over the controls with respect to handle, break, dye uptake, and fullness. In this present study we applied these treatments to hides that had grain properties that were characterized as being loose, more commonly known as having spring break, to see if a reduction in these undesirable properties could be realized. The treatments were applied to the butt, belly and neck areas of the hide, and these samples were subsequently retanned, colored and fatliquored (RCF). There were no significant differences between the untreated controls and treated samples with respect to mechanical properties. Importantly, however, it was determined from subjective evaluations, that those commonly inferior areas, such as belly and neck, showed improved cutting area when treated. At the same time, Scanning Electron Microscopy (SEM) was used to compare the blue stock of both poor quality hides and hides evaluated to be of better quality before and after RCF; distinct differences in fiber structure were observed, most dramatically in the belly area. Applying these treatments to low quality hides makes economic sense. Firstly, leathers are produced that present more quality cutting area, and, secondly, these renewable resources have the potential to replace petroleum feedstuffs that are increasingly becoming scarce as well as expensive. En ligne : https://drive.google.com/file/d/195a0m7TyKHnaMTitdRTZZifmK_ymDEqL/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6369
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Code-barres Cote Support Localisation Section Disponibilité 011705 - Périodique Bibliothèque principale Documentaires Disponible Studies on combination tanning based on henna and oxazolidine / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 10 (10/2009)
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Titre : Studies on combination tanning based on henna and oxazolidine Type de document : texte imprimé Auteurs : A. E. Musa, Auteur ; Balaraman Madhan, Auteur ; Rathinam Aravindhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; B. Chandrasekaran, Auteur ; G. A. Gasmelseed, Auteur Année de publication : 2009 Article en page(s) : p. 335-343 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Among the innumerable alternative tannages that are currently exploited, the vegetable tannins and oxazolidine combination is one of the most promising options. In this study, an organic combination tanning process based on henna and oxazolidine for the production of upper leather is presented. Extract from the leaves of Lawsonia inermis (henna) obtained from Sudan has been utilized for tanning in combination with oxazolidine. It has been observed that this combination tanning, which employs 20% henna extract and 4% oxazolidine results in leathers with shrinkage temperature of 98oC. The differential scanning calorimetry data is in accordance with the observed shrinkage temperature. The change in the order of addition of henna and oxazolidine though showed marginal difference in thermal stability, but significant variations were observed in physical characteristics of leathers. Scanning electron microscopic analysis showed that leathers tanned first with oxazolidine resulted in better fibre splitting. Leather made from oxazolidine followed by henna resulted in relatively softer leathers compared to henna followed by oxazolidine tanning. Leather made from both the tanning combination systems meets the required strength characteristics for upper leathers. The manufacture of upper leathers using combination of henna and oxazolidine appears to be promising. En ligne : https://drive.google.com/file/d/1La-kCqjf6RzfG3UbEoSgcY1Sa9MvCGhn/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6370
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Code-barres Cote Support Localisation Section Disponibilité 011705 - Périodique Bibliothèque principale Documentaires Disponible Preparation and characterization of alkali-soluble collagen from pigskin shavings / Shuai Shao in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 10 (10/2009)
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Titre : Preparation and characterization of alkali-soluble collagen from pigskin shavings Type de document : texte imprimé Auteurs : Shuai Shao, Auteur ; Min Zhang, Auteur ; Li Guoying, Auteur ; Wentao Liu, Auteur Année de publication : 2009 Article en page(s) : p. 344-351 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The leather industry discharges large quantities of solid wastes containing high-value native collagen. In this study, the pigskin shavings generated from the shaving of pelts which had been dehydrated with anhydrous sodium sulfate after deliming were pretreated to remove most of salt and fat. Then alkaline treatment method was used to extract collagen from the pigskin shavings. Sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) and circular dichroism (CD) spectra revealed that the alkali-soluble pigskin collagen (ASPC) retained the polypeptide chains and triple helix conformation. The amino acid profiles showed no major deviation from the characteristic collagen composition. Both of the denaturation temperature and the isoelectric point (pI) of ASPC were lower than those of pepsin-solubilized pigskin collagen (PSPC). Scanning electron microscopy showed that ASPC sponges had porous fibrillar network structures, and the pore sizes became larger with the decrease of collagen concentrations and as the pH of the collagen solution approached the pI of ASPC. En ligne : https://drive.google.com/file/d/1oxrpfE-DAUNzUkC1P-_gIBBVEs02RTLj/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6371
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Code-barres Cote Support Localisation Section Disponibilité 011705 - Périodique Bibliothèque principale Documentaires Disponible Preparation of acrylic resin/montmorillonite nanocomposite for leather tanning agent / Yan Bao in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 10 (10/2009)
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Titre : Preparation of acrylic resin/montmorillonite nanocomposite for leather tanning agent Type de document : texte imprimé Auteurs : Yan Bao, Auteur ; Jian-Zhong Ma, Auteur ; Yan-Li Wang, Auteur Année de publication : 2009 Article en page(s) : p. 352-358 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Acrylic resin/montmorillonite (AR/MMT) nanocomposite was prepared using Na+-montmorillonite (Na+-MMT) via in-situ polymerization of hydrophilic monomer in aqueous medium. The synthetic conditions, such as the contents of MMT and ammonium persulfate (APS), the molar ratio of different monomers, and the dosage of sodium bisulfate on the application properties of nanocomposite were investigated in detail. The thickness increment ratio, the wet-heat resistance and the tensile, slit and burst strengths of leather tanned by AR/MMT were improved and elongations at break and given load were slightly reduced, in contrast to AR treatment; the wet-heat resistance and the physical / mechanical properties of leather tanned by 6% AR/MMT associated with 2% chromate were lower than 8% chromate tanned. As well, AR/MMT facilitates the absorption of chromate. Compared with conventional chrome tanning, the dosage of chromate is reduced 75%. Scanning Electron Microscope (SEM) pictures of leather samples indicated that the collagen fiber of leather samples tanned by AR/MMT was well dispersed when compared to AR and pure chromate treatment. X-ray Diffraction (XRD) and Transmission Electron Microscope (TEM) confirmed AR/MMT is an exfoliated nanocomposite. En ligne : https://drive.google.com/file/d/1AN6WgUbdTfw365gPtqjMEq4IhKLpM0g6/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6372
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Code-barres Cote Support Localisation Section Disponibilité 011705 - Périodique Bibliothèque principale Documentaires Disponible
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Code-barres | Cote | Support | Localisation | Section | Disponibilité |
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011705 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |