Dépouillements

Effect of fillers prepared from enzymatically modified proteins on mechanical properties of leather / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 4 (04/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 4 (04/2008) . - p. 128 - 137 Titre : Effect of fillers prepared from enzymatically modified proteins on mechanical properties of leather Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; William N. Marmer, Auteur ; Eleanor M. Brown, Auteur Année de publication : 2008 Article en page(s) : p. 128 - 137 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In an environment where petroleum feedstuffs are becoming increasingly too expensive for a good cost-effective return, utilization of renewable resources makes economic sense, particularly when these substrates are waste proteins. We have thus proposed the application of enzymatically modified waste proteins from the leather (gelatin) and dairy (casein and whey) industries as fillers in leather production. In previously reported research, we prepared different combinations of these waste proteins, enzymatically modified them, characterized the products and applied them to blue stock using fluorescently labeled proteins to determine how they were distributed in the hide and more importantly not removed by washing. From the data acquired in these previous experiments, we identified potential filling materials. We now have treated various areas in the hide (butt, belly, and neck) with the products, retanned, colored and fatliquored the treated pieces, evaluated them with respect to subjective properties against controls, and finally determined mechanical properties. The results from these tests show that the mechanical properties were not significantly affected by the treatment and subjective properties, e.g., handle, fullness, break and color, were improved over the controls. Fillers thus have the potential to be economically produced from sustainable resources as an alternative to more expensive and increasingly limited conventional products. En ligne : https://drive.google.com/file/d/1PiOi7-VwTFYHO0OzctFOQUl7nF6cVqQd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2567 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
010013	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Reduction of water demand and treatment cost in tanneries through reuse technique / Mariliz Gutterres in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 4 (04/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 4 (04/2008) . - p. 138 - 143 Titre : Reduction of water demand and treatment cost in tanneries through reuse technique Type de document : texte imprimé Auteurs : Mariliz Gutterres, Auteur ; J. O. Trierweiler, Auteur ; L. S. Severo, Auteur ; P. M. Aquim, Auteur ; J. B. Passos, Auteur Année de publication : 2008 Article en page(s) : p. 138 - 143 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Tannery industries employ great amounts of water; because most of their processes occur in an aqueous medium. This leads to the generation of high wastewater flowrates which will have to be treated due to the relatively high concentrations of some pollutant species. The attending paper presents this problematic throughout a case study in Rio Grande do Sul, state of Brazil. It establishes the water consumption in each stage of leather processing. In order to achieve the reduction in the total water consumption, herein it is proposed the water reuse technique in some stages of the process. Experimental results, on industrial scale, are shown so that the methodology is demonstrated to be successful. Water reuse reduces the load of the wastewater treatment plant as well as it reduces the costs. Research on water demand in tanneries defines water consumption for each stage: beamhouse, tanning and pos-tanning operations. It is known that tanneries make use of water in an uncontrolled manner, usually higher than actually would be necessary. Additional, most of the stages use fresh waters from artesian wells or from rivers. Recycling technique is current in liming operation. This paper shows that reuse and recycle techniques could be applied for other operations. Alternatives of water reuse were evaluated through the analysis of the process's wastewater to estimate the concentration of some contaminant parameters. The study was carried out on industrial scale. These parameters are indicators to evaluate the water quality according with the objectives of the reuse system. During analysis, it was tested reuse in the pre-deliming and deliming stages, using 100% of the effluent from bating washing. The parameters analyzed in the process's wastewater with reuse practice did not present any considerable difference when one compared with the conventional process. It demonstrates the viability of reuse practice in tannery industry. This study is of great importance to the environmental and to tannery industry, because the reuse technology aims at a solution to water minimization that results in the maximum environmental protection and cost reduction. En ligne : https://drive.google.com/file/d/1XMrqQGYKTSRXhxdouloYSVUGwDkitjWX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2568 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
010013	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Microemulsion copolymers for retanning applications on leathers / G. V. Ramana in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 4 (04/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 4 (04/2008) . - p. 144 - 150 Titre : Microemulsion copolymers for retanning applications on leathers Type de document : texte imprimé Auteurs : G. V. Ramana, Auteur ; R. W. Sugumar, Auteur ; D. Premkumar, Auteur ; P. Saravanan, Auteur Année de publication : 2008 Article en page(s) : p. 144 - 150 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The microemulsion polymerization method is used to synthesize tercopolymers of styrene, methyl methacrylate and methacrylic acid with finer particle dispersions. Four compositions of the monomers mixture are used in these syntheses. The copolymeriztion reactions are carried out at 70°C with potassium persulphate (KPS) as the initiator. Sodium lauryl sulphate (SLS) and n-heptanol (HA) are being used as the surfactant and cosurfactant combinations, respectively, in these reaction media.These experimental products are employed in retanning wet blue goat skins along with the fatliquoring agent, Balmol SXE. The offer of the experimental products are varied in the retanning experiments and the effects of these products on retanned goat skins are observed by measuring tensile strength, tearing strength and bursting strength. The copolymer products II and III containing 5 and 7.5 weight percents of methacrylic acid as comonomer units , respectively, in the copolymers show considerable improvement in these properties. Product I containing no methacrylic acid groups in the copolymer shows improvement in tensile strength and fall in other properties. Product IV containing 10 (%wt) of methacrylic acid groups in the copolymer does not show considerable improvement in these physical properties, the tensile strength decreases with the offer of the product, no uniform variation of tear strength with the offer level and the grain bursting strength increases with the offer of the product. Scanning electron micrographs (SEM) are obtained for the leathers retanned with product I and these SEM analyses reveal good filling of the product I in the leather matrix. En ligne : https://drive.google.com/file/d/1OnFzPygFxGA9SGckE9oqkCa9gAHrVPlL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2569 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
010013	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Effect of ultrasound on watery dissolutions of vegetable extracts used in leather tanning / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 4 (04/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 4 (04/2008) . - p. 151 - 157 Titre : Effect of ultrasound on watery dissolutions of vegetable extracts used in leather tanning Type de document : texte imprimé Auteurs : Josep Maria Morera, Auteur ; A. Shendryk, Auteur ; V. Diaz, Auteur ; Lluis Ollé, Auteur ; Anna Bacardit, Auteur ; Esther Bartoli, Auteur Année de publication : 2008 Article en page(s) : p. 151 - 157 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This paper analyses the effect of ultrasound on the aqueous dissolutions of vegetable extracts. This effect has been compared with that of a drum, which is the type of reactor used in leather tanning nowadays. The results indicate that the studied effects have similarities and that there is the possibility of using ultrasound during leather tanning with vegetable extracts. This may result in improvements in the quality of the leathers obtained. En ligne : https://drive.google.com/file/d/1rm63A1Ii6nxEDotcUdVaO89fnK74EJcs/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2570 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
010013	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Optimization of various parameters in vegetable tanning using ultrasound / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 4 (04/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 4 (04/2008) . - p. 158 - 161 Titre : Optimization of various parameters in vegetable tanning using ultrasound Type de document : texte imprimé Auteurs : Josep Maria Morera, Auteur ; V. Diaz, Auteur ; G. Fabregat, Auteur ; J. F. Del Rio, Auteur ; Anna Bacardit, Auteur ; Esther Bartoli, Auteur Année de publication : 2008 Article en page(s) : p. 158 - 161 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The influence of different variables has been determined in vegetable tanning when using ultrasound (US). US is used in a traditional tanning process in order to replace the mechanical effect of the drums. This prevents the damaging of the grain which results from the hitting of the hides against the pivots in the drum. However, it is necessary to optimize certain variables so that the use of US can be economically viable. The variables in this study were (a) the power applied (from 16.7 to 4.2 W/L), (b) the time devoted to the effect of US, and (c) the concentration of tanning liquor. These variables are of fundamental importance when attempting to determine the economic viability of the tanning system proposed here. The parameters that have been controlled during the tests were (a) the density of the float, (b) the absorption of the vegetable extract in the hide, and (c) the time devoted to tan-through. The tests provided positive results when using US with a power of 8.35 W/L and processing only for 5 hours. The quality of the grain in the pieces of leather obtained using US is higher than that of similar pieces of leather made using the drums. En ligne : https://drive.google.com/file/d/1HduodT_0ABKjkORRlUZo_NP443c0QY0S/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2571 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
010013	-	Périodique	Bibliothèque principale	Documentaires	Disponible