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Hair saving unhairing process - Part 4. Remarks on the evolution of the investigations on enzyme unhairing - JSLTC Vol. 85, N° 4 - 07-08 2001.pdf / Carlos S. Cantera in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 4 (07-08/2001)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 4 (07-08/2001) . - p. 125-132 Titre : Hair saving unhairing process - Part 4. Remarks on the evolution of the investigations on enzyme unhairing - JSLTC Vol. 85, N° 4 - 07-08 2001.pdf Type de document : texte imprimé Auteurs : Carlos S. Cantera, Auteur Année de publication : 2001 Article en page(s) : p. 125-132 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux Epilage enzymatique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this new article of the series "Hair saving unhairing process" the development of the theme of enzyme unhairing is initiated. It gathers three curious features : it has been extensively studied by many researchers in different countries during the last century, it is scarcely used in the industry and it still keeps the attraction, as a challenge, to keep on calling together the interest of research groups that find in this process the ideal unhairing process. Enzymatic unhairing will be the ideal unhairing process when the enzyme specificity is guided specially towards the components of the epidermis system, its action on the structured proteins—especially the collagen—is minimized or avoided, and when leather is developed with desirable properties. The aim of this first article on the enzyme unhairing is to show—with no intention of being exhaustive—the research evolution of those work groups that showed relevant activity, adding in each of the sections comments and complementary suggestions from other work. Experimental studies and theoretical speculation at the Leather Research and Development Centre (CITEC) on the hair—saving unhairing process, particularly enzyme unhairing, tries to contribute to better knowledge on mechanisms (diffusive and chemical) involved in the unhairing, with the purpose of proposing the design of enzyme preparations to bring us closer to ideal unhairing. The introduction of the research evolution on the enzyme unhairing, the behaviour of enzyme preparations on different substrates, the mechanisms that can take place in the process and the desirable/undesirable properties of resultant leather come before the presentation of the experimental results that are being obtained at CITEC. Thus, we will show in a further article, the results of the characterisation of commercially available enzyme preparations through the evaluation of proteolytic activities against a representative substrate of animal hide components and the activation inhibition effects that an unhairing system has on enzymes. En ligne : https://drive.google.com/file/d/11NnYX35BV5FNy11vL-JXMSFnzprIfIiS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40243 [article]

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Measurement of creep relaxation and bagginess indexes of leather / Albert M. Manich in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 4 (07-08/2001)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 4 (07-08/2001) . - p. 133-136 Titre : Measurement of creep relaxation and bagginess indexes of leather Type de document : texte imprimé Auteurs : Albert M. Manich, Auteur ; Teresa Bosch, Auteur ; A. J. Long, Auteur Année de publication : 2001 Article en page(s) : p. 133-136 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux Fluage Gonflement (physique) Relaxation des contraintes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Currently there are no available standard methods to measure the "creep" and the "relaxation" of leather. In this paper a new method is proposed which allows determination of both parameters as well as the retained set or "bagginess". The creep and the stress-relaxation phenomena quantify the visco-elastic character of leather and are related to handle and comfort characteristics. Note de contenu : - Description of the method : Evaluation of stress-relaxation - Evaluation of creep - Experimental : Correlation with handle assessment - Table 1 : Characteristics of leathers, results of creep and stress-relaxation indexes - Table 2 : Anaysis of Correlation between the creep and the stress-relaxation indexes and the values of subjective handle given by the experts En ligne : https://drive.google.com/file/d/1rufOaCTbrTIz60qArRIcSp-eJhvJYqY_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40244 [article]

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Assessment of properties and effect of heterogeneous cultures of aerobic micro-organisms in the bio technology of tannery wastewater / J. Kupec in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 4 (07-08/2001)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 4 (07-08/2001) . - p. 137-139 Titre : Assessment of properties and effect of heterogeneous cultures of aerobic micro-organisms in the bio technology of tannery wastewater Type de document : texte imprimé Auteurs : J. Kupec, Auteur Année de publication : 2001 Article en page(s) : p. 137-139 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Biodégradation Biopolymères Biotechnologie Boues résiduaires -- Analyse Cuirs et peaux -- Déchets Déchets industriels -- Elimination Microorganismes Tannage -- Déchets Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The article presents a review of results we obtained during recent years in the field of assessing the properties and effect of activated sludge produced during treatment of tannery wastewaters by activation. The first part primarily mentions works concerning this biornass itself (composition. activity, sorption properties and others). The second then summarises results obtained when evaluating processes under way during the removal of specific substrates produced by tanning manufacture (e.g. proteins, tanning agents). The results can serve to choose alternatives capable of use in disposing of the significant pollution that tanning emits into the environment. Note de contenu : - Survey results : Elementary analysis - Biopolymers - Adsorbance - Buffer ability - Treatment of tanning materials - Enzyme activity - Respiration activity - Biodegradation of proteins and polyphenols En ligne : https://drive.google.com/file/d/1wX_JgFPpBR5LXe7ouWq9uvYSuevSrClg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40245 [article]

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The correlation between composition of vinyl polymer tannages and their properties / Wei Wang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 4 (07-08/2001)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 4 (07-08/2001) . - p. 140-143 Titre : The correlation between composition of vinyl polymer tannages and their properties Type de document : texte imprimé Auteurs : Wei Wang, Auteur ; Jianzhong Ma, Auteur ; Zongsui Yang, Auteur ; Lingxian Feng, Auteur Année de publication : 2001 Article en page(s) : p. 140-143 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Cuirs et peaux -- Propriétés mécaniques Polymères -- Synthèse polymères vinyliques Tannage synthétique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The correlation between the composition of vinyl polymer tannages and their properties were studied by using the two-power regression orthogonal design. Six monomers (AN-acrylonitrile, AM-acrylic amide, MAA-methyl acrylic acid. MMA-methyl methacrylate. VAc-vinyl acetate, EA-ethyl acrylate) were chosen to copolyrnerize with acrylic acid (AA) to form the corresponding copolymers. Using these copolymers as tannages, ten indexes of retanning properties. e.g. thickness increment, shrinking temperature increment. phys-mech properties, compressibility factor, were measured. Using regression analysis the experimental cognitive equations relating properties with composition of tannages were derived. The form is Yp = ax2 + bx + c (p. a, It, c are regression parameters). The influences of tannages composed with different comonomers on the properties of leather samples are also discussed. Note de contenu : - Experimental details : Design - Synthesis - - Application : Materials and equipment - Application procedures - Characterisation of leather samples - Results and discussion : The experiment data - Data pret-treatment - Quantitative correlation between composition and properties - Optimization and verification of result - Conclusions : Qualitative conclusion - Quantitative conclusion En ligne : https://drive.google.com/file/d/1vyfcZOwGoFcK1YgoBoGMc1tx3D0-7K4E/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40246 [article]

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