Oxidative unhairing with hydrogen peroxide : development of an industrial scale process for high-quality upper leather / S. Bronco in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 2 (02/2005)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. C, N° 2 (02/2005) . - p. 45-53 Titre : Oxidative unhairing with hydrogen peroxide : development of an industrial scale process for high-quality upper leather Type de document : texte imprimé Auteurs : S. Bronco, Auteur ; Sandra Vitolo, Auteur ; Maurizia Seggiani, Auteur ; M. Salvadori, Auteur ; G. d'Elia, Auteur ; D. Castielo, Auteur Année de publication : 2005 Article en page(s) : p. 45-53 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : As an alternative to the traditional process based on the use of sulfides, an unhairing process in drum by hydrogen peroxide was developed for the production of high-quality bovine upper leather. A preliminary investigation at laboratory scale has allowed us to set out the optimal process conditions, in terms of H2O2 dosage and pH, in order to achieve an effective unhairing and a compatible swelling of the hide. The pilot and industrial scale runs have assessed the industrial feasibility of the process that allows the production of a versatile base for different final applications of the leather (either chrome or vegetable tanned), and appear practical to implement as well as compatible with existing machinery. The finished leather obtained by the innovative unhairing process shows good physical-mechanical and technical properties comparable with those of the traditional process, and the leather was technically assessed as satisfactory and suitable for use in the production of high quality upper leathers. The major pollutants of the oxidative unhairing, either as absolute concentrations or if normalized with respect to the salted weight of hide processed, appear quite similar to those from the traditional process. The evident advantage is obviously the complete absence of dissolved sulfides in the exhaust baths of the oxidative process. Scanning electron microscopy was used as investigation method to better understand the mechanism of the oxidative unhairing in comparison with the traditional. En ligne : https://drive.google.com/file/d/1r9dNeH9n5FPgt2ADVOdqhb0OpkXBFRdb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4076 [article]

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A practical evaluation of acrylic resins and the development of a materials evaluation method / M. Bientinesi in WORLD LEATHER, Vol. 18, N° 4 (06-07/2005)  

[article]  inWORLD LEATHER > Vol. 18, N° 4 (06-07/2005) . - p. 31-35 Titre : A practical evaluation of acrylic resins and the development of a materials evaluation method Type de document : texte imprimé Auteurs : M. Bientinesi, Auteur ; Maurizia Seggiani, Auteur ; Sandra Vitolo, Auteur ; Domenico Castiello, Auteur ; M. Salvadori, Auteur Année de publication : 2005 Article en page(s) : p. 31-35 Langues : Anglais (eng) Catégories : Agents de tannage Cuirs et peaux -- Analyse Essais (technologie) Evaluation Indice des prix Polyacryliques Polymères -- Analyse Retannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study describes a method for evaluating commercial acrylic resins as used in retannage. By means of in-house tests, this technique can prove useful to tanneries in the selection of resin retanning agents that, from a cost-effectiveness point of view, best suit their purposes. The technique has been used previously in an evaluation of dyestuffs and, furthermore, it is believed that this method can be used as a powerful tool within any manufacturing process as part of product or component evaluation. Note de contenu : - The study - Consistency tests - Determination of the performance index - Determination of the price index - Findings from the investigation - The performance index - The final product evaluation - Findings from the investigation - Fig. 1 : Standard procedure for retanning, dyeing and fatliquoring - Fig. 2 : Weightings attributed to tactile parameters of finished leather - Fig. 3 : Dry solids content of resins - Fig. 4 : Lastometer test results - Fig. 5 : Evaluation of retanned, fatliquored and dyed leathers - Fig. 6 : Price index for resins - Fig. 7 : Final evaluation of resins examined - Panel 1 : Price index calculations for resins En ligne : https://drive.google.com/file/d/1JRiRbDpp1z_yI_qImQR3AimWuGELVlcs/view?usp=drive [...] Format de la ressource électronique : pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32465 [article]

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