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Mechanisms and benefits of upgrading technologies in finishing / Loyd J. Burcham in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 6 (06/2005)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. C, N° 6 (06/2005) . - p. 209-216 Titre : Mechanisms and benefits of upgrading technologies in finishing Type de document : texte imprimé Auteurs : Loyd J. Burcham, Auteur ; Diamano Cracco, Auteur Année de publication : 2005 Article en page(s) : p. 209-216 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Upgrading of leather crusts that have been damaged by hide defects such as tick bites, scars, and other imperfections remains a high priority in leather finishing because it enables manufacturers to improve the overall quality of their finished leather. The present study uses surface mapping techniques to characterize samples of upgraded full-grain leathers prepared by reverse roll-coating (RRC) and hand stucco application methods. Specific techniques used for surface characterization included Impulse Thermography for surface thermal properties, FTIR mapping for surface chemical properties, dynamic contact angle mapping for surface tension, and scanning-electron and optical microscopy for surface morphology. It was found that the RRC method results in an upgraded crust surface that exhibits very uniform surface properties across the entire surface and in both defect and non-defect areas. By contrast, hand stucco results in a non-uniform crust surface with extremely discontinuous surface properties between defect and non-defect areas. Moreover, adjustments in the RRC add-on coat weight allow for selective and exclusive defect filling while maintaining constant surface physical and chemical properties outside of defect areas through the presence of a thin binder film across the entire surface. Therefore, while the mechanism of upgrading in hand stucco is simply the filling of defects, the mechanism of RRC upgrading comprises the filling of defects plus homogenization of surface physical and chemical properties. These uniform surface properties created by RRC upgrading provide a unique benefit by "priming" the surface for efficient and uniform application of subsequent basecoats and topcoats. En ligne : https://drive.google.com/file/d/1FSLaE4BG3xcWOJ4gexwhapuJGJoVDPRJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4059 [article]

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Preparation of chrome liquor using chrome shavings as reducing agent / Cheng Fengxia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 6 (06/2005)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. C, N° 6 (06/2005) . - p. 217-224 Titre : Preparation of chrome liquor using chrome shavings as reducing agent Type de document : texte imprimé Auteurs : Cheng Fengxia, Auteur ; Ji Xianyong, Auteur ; Li Weihua, Auteur ; Zhang Yahong, Auteur ; Zhang Hanbo, Auteur Année de publication : 2005 Article en page(s) : p. 217-224 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Chrome-tanned waste produced in the leather industry would be a heavy burden to the ecological environment if stored without treatment. However, the collagen protein and chrome in leather shavings are both very precious resources and can be recycled. In this study, the high protein containing chrome shavings were utilized for the reduction of chromium(VI) in the preparation of chrome liquor. In the preliminary research, a practical synthesis method using chrome shavings as reducing agent was developed. To investigate the factors influencing the reaction process such as the quantity of sulfuric acid and shavings, reduction time and temperature, etc., various experiments were carried out including orthogonal tests, homogeneous tests, and single-factor tests. Data processing methods were adopted including range analysis, variance analysis, and regression analysis. Mathematical models were built to reflect the relationship of the quantity of sulfuric acid, shavings, and the reduction time to the basicity of chrome liquor and the percent reduction of sodium dichromate by shavings. En ligne : https://drive.google.com/file/d/1d5emrsJhJJCNzl_zzapzaCT2LRhc1Xjy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4061 [article]

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Integration of chrome tanning and wet finishing process for making garment leathers / Palanisamy Thanikaivelan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 6 (06/2005)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. C, N° 6 (06/2005) . - p. 225-232 Titre : Integration of chrome tanning and wet finishing process for making garment leathers Type de document : texte imprimé Auteurs : Palanisamy Thanikaivelan, Auteur ; Balachandran Unni Nair, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Subramani Saravanabhavan, Auteur Année de publication : 2005 Article en page(s) : p. 225-232 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Clean technologies are gaining importance in recent years among the tanners due to increased public pressure against the environmental degradation from tanning activity. Conventional leather processing is also associated with huge consumption of water, power, chemicals, labor and time. To alleviate these problems, a single step chrome tanning cum wet finishing process has been developed for making garment leathers. The process provides leathers having comparable or even better physical and bulk properties to that derived from conventional multi step process. Softness of the processed leathers is comparable to that of control leathers as confirmed through compressibility measurements. Integration of chrome tanning with post tanning improves the exhaustion of chromium thereby chrome content in the leathers. The process results in significant reductions in pollution loads, water, time, power and labor. More specifically, water consumption is reduced by half that of conventional requirement. En ligne : https://drive.google.com/file/d/1WhB_vCzUkyTFCe4p9XokxR1-IhYcQEXQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4062 [article]

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Direct chrome liquor recycling under indian conditions : Part 1. Role of chromium species on the quality of the leather / Kalarical Janardhanan Sreeram in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 6 (06/2005)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. C, N° 6 (06/2005) . - p. 233-242 Titre : Direct chrome liquor recycling under indian conditions : Part 1. Role of chromium species on the quality of the leather Type de document : texte imprimé Auteurs : Kalarical Janardhanan Sreeram, Auteur ; T. Ramasami, Auteur ; Balachandran Unni Nair, Auteur ; Chandra Babu Narasimhan Kannan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; R. Ramesh, Auteur Année de publication : 2005 Article en page(s) : p. 233-242 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The direct recycling of chrome liquor in pickle or tanning bath is gaining importance in the management of chromium and total dissolved solids in tanneries. Earlier studies indicate that the pre-acidification of the chrome liquor avoids surface fixation of chromium, thereby resulting in quality leathers. This assumes significance as it alters the charge and species-wise composition of the chrome liquor. In this study, the influence of pre-acidification pH on the nature of chromium (III) species and the resulting affect on the quality of leathers has been investigated The results obtained in this study indicate that a pre-acidification of spent chrome liquor to a pH of 1.0 results in the formation of larger percentage of lower charged species, thereby avoiding the surface fixation of chromium. The organoleptic properties, chromium distribution, and SEM analysis of the leathers processed using direct recycling methodology after pre-acidification of the spent chrome liquor to pH 1.0 indicates that the quality of leathers is not impaired. There is no significant influence of the pre-acidification pH on the pollution load. En ligne : https://drive.google.com/file/d/1J-Rnt9HMf407aWjtQ-HKnQqeRA73qMDH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4063 [article]

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