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A new pretannage with glyoxal and N-thioureidopyromellitamic acid for high exhaust chrome tannage / Hongru Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 3 (03/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 3 (03/2006) . - p. 81-85 Titre : A new pretannage with glyoxal and N-thioureidopyromellitamic acid for high exhaust chrome tannage Type de document : texte imprimé Auteurs : Hongru Wang, Auteur ; Xiang Zhou, Auteur Année de publication : 2006 Article en page(s) : p. 81-85 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A new compound, N-Thioureidopyromellitamic acid, has been synthesized from pyromellitic dianhydride and thiosemicarbazide, and used in pretanning along with glyoxal to improve chromium uptake. The results show that the pretanned pelt has a higher shrink temperature than conventionally processed pelt and subsequent chrome tanning results in a significant increase in chromium uptake, and thus the chrome offer in conventional chrome tanning can be reduced in large amounts. Furthermore, because of higher shrink temperature of the pretanned pelt, the initial temperature of two stage chrome tanning is raised and thus a much higher exhaustion of chromium is obtained at the elevated tanning temperature. The handle and the physical properties of pretanned crust leather are not much different from those of crust leather made from pelts that were not pretanned. En ligne : https://drive.google.com/file/d/1_bY8n9FacI7mfqrJS_B7YQ4RRH2_q6lR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4018 [article]

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High exhaust chrome-aluminium combination tanning : Part 1. Optimization of tanning / Kalarical Janardhanan Sreeram in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 3 (03/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 3 (03/2006) . - p. 86-95 Titre : High exhaust chrome-aluminium combination tanning : Part 1. Optimization of tanning 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 Année de publication : 2006 Article en page(s) : p. 86-95 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Managing chromium in both liquid and solid wastes is the need of the hour. The use of an aluminium based syntan (Alutan), in tanning, helps in the increased uptake of chromium by the hide/skin during tanning. This method also forms a chrome saver approach wherein reduced amount of chromium is offered, thereby reducing the concentration of metal ion in the waste stream. The use of Alutan during tanning finally helps in the reduction of post tanning chemicals offer. A detailed investigation has been made to optimize the tanning system for a standard wet finishing process for both upper and nappa leathers. It has been established through this study on cow hides that a combination of 5% basic chromium sulfate (BCS) and 1.5% Alutan for upper leathers and 5.5% BCS and 1.0% Alutan for nappa leathers are ideal tanning systems. Chromium uptake is in the range of 84-94% with 472-1341 ppm of chromium in the spent tan liquor. The distribution of chromium in thicker cow sides is uniform and comparable to that of conventional tanned leathers even at reduced dosage. In spite of reduced offer of syntans and dyes, the performance of leathers is shown to be on par with leathers produced by conventional process through physical and hand evaluation. The Alutan-BCS combination tanning forms a viable eco-benign chrome saver approach. En ligne : https://drive.google.com/file/d/1IFphn7RZtiyj3yAGqiuZg46Ps8KtI5gR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4019 [article]

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Ecological and innovative fungicide for the leather industry : Essential oil of Origanum minutiflorum / Eser Eke Bayramoglu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 3 (03/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 3 (03/2006) . - p. 96-104 Titre : Ecological and innovative fungicide for the leather industry : Essential oil of Origanum minutiflorum Type de document : texte imprimé Auteurs : Eser Eke Bayramoglu, Auteur ; G. Gulumser, Auteur ; Ismail Karaboz, Auteur Année de publication : 2006 Article en page(s) : p. 96-104 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Origanum minutiflorum (oregano) is an endemic species in Türkiye, from which essential oil is produced from its leaves and flowering tops by steam distillation. The antimicrobial activity of essential oil is known for years and many studies concerning its applications on different fields (medical science, pharmacy, food industry, etc.) have been carried out due to its advantages of being natural and nonmutagenic. The objective of this study was to examine the applicability of Origanum minutiflorum essential oil as a fungicide against fungus that grows on leather during the pickling and tanning processes. In the study, 2-Thiocyano-methylthiobenzotiazole (TCMTB) and N-octyl-isothiazolinone (N-OITZ) containing commercial fungicides were also used as controls. During the microbiologic tests, the growth of mould species like Aspergillus niger, Alternaria alternata, Penicillium rubrum and Trichoderma viride that cause problems in leather industry were also investigated against this essential oil and the fungicides. The results of this study show that oregano essential oil has antifungal activity and its effect improves with increasing concentration. Comparison of the experimental results reveals that leather treated with oregano essential oil is even more resistant against test moulds than leather treated with commercial fungicide at their recommended dosage. En ligne : https://drive.google.com/file/d/1_hrnp3U2bPsLkly0FamqXhKodSpk20fk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4020 [article]

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Infrared drying : A leather finishing application / S. Jöns in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 3 (03/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 3 (03/2006) . - p. 105-111 Titre : Infrared drying : A leather finishing application Type de document : texte imprimé Auteurs : S. Jöns, Auteur ; F. Taracena-Sanz, Auteur ; R. Zitzumbo-Guzman, Auteur Année de publication : 2006 Article en page(s) : p. 105-111 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In leather finishing, alternative technologies such as infrared radiation can provide fast and efficient heat transfer for drying water-based films compared to conventional convection processes. In this investigation, an infrared dryer was designed and parameters such as heater distance to substrate, number and spacing of heaters, and leather transport speed were evaluated by using response surface methodology. From an experimental array, it was found that heater spacing is not statistically significant. However, other variables can be manipulated to improve overall dryer performance. A statistical model predicting the film drying in the infrared dryer was derived which can be used to choose suitable operating conditions for a particular finishing formulation. Furthermore, if the equipment is properly tuned, IR radiation can reduce both dryer length and residence time of the substrate during the drying process. En ligne : https://drive.google.com/file/d/1B1rKzCziygOEiEuYH9xwk8SuTtZCa85f/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4021 [article]

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