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JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) / Union internationale des sociétés de techniciens et chimistes des industries du cuir . Vol. 94, N° 4Mention de date : 07-08/2010Paru le : 17/08/2010 |
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Ajouter le résultat dans votre panierApplication of the hypothesis analysis method using Cohen's Kappa index to measure the agreement between leather sorters / Patricia Casey in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 4 (07-08/2010)
[article]
Titre : Application of the hypothesis analysis method using Cohen's Kappa index to measure the agreement between leather sorters Type de document : texte imprimé Auteurs : Patricia Casey, Auteur ; Gustavo Altobelli, Auteur ; Pablo Pignatelli, Auteur Année de publication : 2010 Article en page(s) : p. 144-148 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Automobiles -- Matériaux
Cuirs et peaux -- DéfautsTags : 'Cuir automobile' 'Défauts des surfaces' Evaluation 'Critères de tri' 'Index Kappa Cohen' Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : One of the more sensitive activities carried out in a tannery, because of the impact the results could cause on the customer and on the tannery's business is, certainly, the sorting or grading of the hides in the different stages (wet blue or wet white, crust and finished). The surface defects affect the aesthetics appearance of leather and leather goods as well as the usable area. If the grade assigned to a hide by a sorter is lower than the one it really is, according to the agreement with the customer it will cause economical damage to the tannery. On the other hand, if the grade assigned is higher than the one it really is, the customer will be disappointed and claim. The detection of defects on the surface of natural materials such as leather is a difficult task because of the variety of shapes and textures, as well as in the quality and quantity of defective areas. The most common method applied in the leather industry to sort or grade hides is visual inspection. Notwithstanding the sorting or grading criteria could be well defined and agreed between the tannery and the customer, we can always wonder: if we change from one sorter to another, which will be the concordance level existing between them? In other words, how far the sorters will coincide on their evaluation? Will the result be a real or random one? Due to the variability between two or more sorters which is traditionally recognized as an important source of mistakes, from our point of view, it would be very useful to transform an attribute analysis into a variable one. The tanneries that supply leather to the automotive companies have to certify their Quality System according to QS 9000 or ISO/TS 16949. One of the requirements in that norm and technical specification is to apply the Automotive Industry Action Group (AIAG) reference Manual "Measurement Systems Analysis" which describes the study of the measurement systems by attributes. In this paper, we describe the practical way on which the agreement between sorters is measured and the application of the hypothesis analysis method, cross tabulation, calculating Kappa coefficient initially proposed by Cohen, which is a statistical concordance rating measure for qualitative (categorical items) between two sorters. En ligne : https://drive.google.com/file/d/1qXL_GNqU5y1ahjug61SvgZKc9UK5pxYc/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9856
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Code-barres Cote Support Localisation Section Disponibilité 012384 - Périodique Bibliothèque principale Documentaires Disponible A thermogravimetric study on tannery sewage sludges in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 4 (07-08/2010)
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Titre : A thermogravimetric study on tannery sewage sludges Type de document : texte imprimé Année de publication : 2010 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Boues d'épuration
Déchets industriels -- Elimination
Formaldéhyde -- Elimination
Tannage -- Aspect de l'environnement
ThermogravimétrieTags : Boues d'épuration de tannerie 'Comportement thermique' TG-DSC-MS ICP-AES GC-MS Purge Piège Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Two different tannery sewage sludges (sludge 1 and sludge 2) have been characterized by thermal analysis coupled with mass spectrometry of evolved gases (TG-DSC-MS), inductively coupled plasma-atomic emission spectrometry (ICP-AES), Gas chromatography - mass spectrometry (GC-MS), Purge and trap GC-MS. Four main temperature ranges of weight loss are individuated in air flow TG-DSC-MS experiments on sludge 1. The first, below 200°C, coupled to an endothermic signal, is related to water release. Between 200 and 350°C, an exothermic signal accompanies the loss of sulphate as evolved SO2, and organic substances, aromatics and saturated cyclic compounds. In the latter range, development of CO2 was also observed, that becomes prevalent in the range 350-600°C. From 600 to 700°C carbon dioxide coming from carbonate decomposition was observed. On sludge 2 three main temperature ranges of weight loss are present, below 150°C, between 150 and 350°C and from 350 to 600°C, attributed, respectively, to water, sulphate, CO2 plus aromatic and carbonylic compounds releases. A larger amount of Cr and Al was found by ICP-AES on sludge 2. The differences between the samples evidence the influence of the different composition of the parent wastewater and of the depuration process. The influence of additives on combustion profiles has been also evaluated. Catalyst addition to the sludge results to reduce the emission of cyclic and aromatic substances, to lower temperature and to increase the oxidation rate of the organic fraction combustion. En ligne : https://drive.google.com/file/d/1GKKbQQRkjZK5PMvyYPBGvxaS438SO0eT/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9857
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Code-barres Cote Support Localisation Section Disponibilité 012384 - Périodique Bibliothèque principale Documentaires Disponible Oxidation of Cr3+ to Cr6 by hydroxyl radicals in leather / Ling Zhang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 4 (07-08/2010)
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Titre : Oxidation of Cr3+ to Cr6 by hydroxyl radicals in leather Type de document : texte imprimé Auteurs : Ling Zhang, Auteur ; Yu Congzheng, Auteur ; Yang Hongmin, Auteur ; Hu Qiang, Auteur Année de publication : 2010 Article en page(s) : p. 156-160 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chrome trivalent -- Oxydation
Cuirs et peaux
HydroxylationTags : Cuir Tannage Chrome Oxydation 'Radicaux hydroxyles' 'Acide benzoïque' 'Réactif de Fenton' 'Dichromate potassium' 'Spectroscopie ultraviolette' Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study assesses the role of hydroxyl radicals (OH) on the formation of Cr6+ in leather. To avoid the complexity of composition of chemicals produced in leather fatliquors. OH produced from the oxidation of lipids in leather fatliquors was replaced by OH produced by a fenton reagent.
At room temperature, Fenton reagent was reacted with solutions of CrCl3, CrCl3-benzoic acid, chrome tanning agent and chrome tanning agent-benzoic acid, respectively. The amounts of Cr6+ was explored and the effect of adding an OH scavenger(benzoic acid) on inhibiting the formation of Cr6+ was also studied.
Using ultraviolet spectrometry, the molecular structure of benzoic acid was analysed both before and after oxidation by Fenton reagent or potassium dichromate. The oxidization of Cr3+ to Cr6° by Fenton reagent was initially explored. The results showed that the OH group can oxidize Cr3+ to Cr6+ in both systems of CrCl3 and chrome tanning agent and the OH scavenger can inhibit the production of Cr6+. When the amount of benzoic acid was 3wt.% of the chrome the Cr6+ concentration was decreased by 99.3 % in 90 minutes.En ligne : https://drive.google.com/file/d/1gNTHd8wfl8LJkh665-JpBKuDX3FPiFKq/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9858
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Code-barres Cote Support Localisation Section Disponibilité 012384 - Périodique Bibliothèque principale Documentaires Disponible Vertically integrated sheepskin processing / Peter Robinson in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 4 (07-08/2010)
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Titre : Vertically integrated sheepskin processing Type de document : texte imprimé Auteurs : Peter Robinson, Auteur Année de publication : 2010 Article en page(s) : p. 161-166 Langues : Anglais (eng) Catégories : Cuirs et peaux
Cuirs et peaux -- Finition
Cuirs et peaux de moutons
TannageTags : 'Peau de mouton tannée' Royaume-Uni 'Industrie du cuir' 'Processus tannage finissage' Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The aim of this presentation is to give an overview of the sheepskin industry and illustrate the major sheepskin tanning and finishing processes, which are undoubtedly familiar to most readers. In the final section of the presentation, we discuss some of the critical decisions facing the UK sheepskin industry for the 21st Century. En ligne : https://drive.google.com/file/d/13tLyV6Gdmib_fPQO3WYuM-mGLjPevADQ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9867
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Code-barres Cote Support Localisation Section Disponibilité 012384 - Périodique Bibliothèque principale Documentaires Disponible Zirconium acetate - Oxazolidine combination tannages in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 4 (07-08/2010)
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Titre : Zirconium acetate - Oxazolidine combination tannages Type de document : texte imprimé Année de publication : 2010 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acétate de zirconium
Chrome
Cuirs et peaux
Oxazolidine
TannageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : SOLO TANNAGES : Effect of concentration and time on the shrinkage temperature - Effect of temperature on shrinkage temperature - Effect of pH on the shrinkage temperature.
COMBINATION TANNAGES : Oxazolidine/zirconium acetate tannage - Chrome/zirconium acetate combination tannage.En ligne : https://drive.google.com/file/d/1HXWRLYCACHomr6Ij9ohiK52Q_dZCkRIM/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9868
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012384 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |