Collaborative study for the determination of repeatability and reproductibility of the measurement of the water vapour permeability of leather with method ISO 14268 / Giorgio Pozza in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 6 (11-12/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 6 (11-12/2016) . - p. 289-297 Titre : Collaborative study for the determination of repeatability and reproductibility of the measurement of the water vapour permeability of leather with method ISO 14268 Type de document : texte imprimé Auteurs : Giorgio Pozza, Auteur Année de publication : 2016 Article en page(s) : p. 289-297 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse Mesure Perméabilité Vapeur d'eau Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The standard method 1SO 14268 describes a technique for the measurement of water vapour permeability (WVP) of leather which is based on the mass surge of a desiccant contained in a vessel sealed with the specimen under test. The water vapour that seeps inside the container through the leather specimen is absorbed by the desiccant, the mass of which increases proportionally ; fresh water vapour is provided onto the external side by a constant flow of air conditioned at 23°C and 50% relative humidity that is perpendicularly conveyed onto the specimen surface by a rotating fan. Since the inner side of the vessel is kept dry by the desiccant, the difference of chemical potential between the two facets generates a diffusive force (quantitatively accounted for by the first Fick's law) that drives water vapour across the leather piece in the out-in direction. The mass increase of the desiccant nominally equates the total amount of vapour that has crossed the leather specimen so that the WVP can be calculated by dividing the mass growth of the desiccant by the duration of the measurement (between 7 and 16 hours) and by the exposed area of the specimen. Note de contenu : - Design of the precision experiment - Materials and sampling - Raw data - Statistical analysis - Scrutiny for consistency and outliers : Mandel's statistics - Cochran's test - Grubbs' tests - Final decisions about the consistency of the experimental data - Functional relationship between precision values and mean level - Supplementary considerations concerning the trueness of the method and the results En ligne : https://drive.google.com/file/d/1tSDXouH5NqzF5se05J2JIq00sKn3rsOn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27664 [article]

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The measurement of water vapour permeability of leather with ISO 14268 and related methods / Giorgio Pozza in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 4 (07-08/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 4 (07-08/2015) . - p. 157-162 Titre : The measurement of water vapour permeability of leather with ISO 14268 and related methods Type de document : texte imprimé Auteurs : Giorgio Pozza, Auteur Année de publication : 2015 Article en page(s) : p. 157-162 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants Adsorption Cuir Déshydratation Gel de silice Perméabilité Vapeur d'eau Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A known technique to measure the water vapour permeability of leather is described by ISO 14268 and similar standards. These methods rely on the adsorption of the water vapour by a solid desiccant inside a closed vesse' that is separated from a conditioned atmosphere by the leather piece. The mass increase of the desiccant corresponds to the amount of moisture transmitted by the specimen and is thus used to calculate its water vapour permeability. In this investigation different desiccants are used to measure the permeability of a chrome split and of cellulosic membranes, showing that the results are influenced by the features of the desiccant. As accounted by the theoretical modal proposed, the outcome of the measurement is affected by a systematic error that leads to an underestimation of the true value of permeability. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Equipment - Measurement of the permeability - THEORETICAL BACKGROUND : Diffusion - Adsorption dynamic of the desiccant - RESULTS AND DISCUSSION : Permeability of the leather measured with the three silica gels G1, G2 and G3 - Adsorption dynamic ofthe silica gels - Influence of the quantity of dessicant on the permeability estimate En ligne : https://drive.google.com/file/d/1Ef7XCtG_PkooQUO_GD_DFN8Bqupybd2A/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24556 [article]

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