Application 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]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 94, N° 4 (07-08/2010) . - p. 144-148 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 -- Défauts Tags : '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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9856 [article]

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The soft sell / Patricia Casey in LEATHER INTERNATIONAL, Vol. 217, N° 4861 (06/2016)  

[article]  inLEATHER INTERNATIONAL > Vol. 217, N° 4861 (06/2016) . - p. 39--41 Titre : The soft sell Type de document : texte imprimé Auteurs : Patricia Casey, Auteur ; Nicolàs Delgado, Auteur ; Silvia Metz, Auteur ; Leonardo Pileggi, Auteur Année de publication : 2016 Article en page(s) : p. 39--41 Langues : Anglais (eng) Catégories : Cuir dans les automobiles Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Douceur (toucher) Sellerie Sièges Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Importance on the relationship between softness and directionality of physical properties on leather for automotive upholstery. The interiors of high-quality cars are characterised by having a sophisticated design, sometimes minimalist, but very demanding. The seats of an automobile are important to secure comfort and safety to the driver and other passengers. Not only are colour, feel and the overall aesthetic of the seat important, but equally so is the comfort. If the seats fail, the travel experience can be unpleasant. An improper seat leads to greater fatigue and back pain. Leather is the material preferred for upholstering the interior of high-quality cars and, it being a natural product, faces demanding challenges to adapt it to the range that each automotive terminal applies. Often, companies engaged in cutting, sewing and assembling car-seat covers raise claims against leather suppliers because of defects such as : - wrinkles that, when the cover is manufactured for the seat or the headrest, appear on some identical parts but not on others - parts that, when sewn, stretch and deform, not returning to their original size or aspect - covers of which the pieces are cut from the same lot of leather and when placed on the seat, show unwanted wrinkles or look distorted. Each automotive terminal issues technical specification of which the purpose is to ensure the consistent quality of the leather to be processed, while considering the influence of physical, chemical and organoleptic properties during the stages of manufacture This article describes the relationship between the softness of the leather, measured by different methods and directionality of physical properties, and the influence they have to obtain a defect-free product. Note de contenu : - Leather as the material of choice - Topographical distribution leather physical properties - Description of the test methods - Determination of the most favourable leather zone and direction - FIGURES : 1. Average of softness and bending length results on each leather zone - 2. Correlation diagram between softness and bending length results - 3. Results of bending length - cantilever (mm) - 4. Histogram of bending length measurements (mm) - TABLES : 1. Softness and bending length results on each leather zone and each hide (mm) - 2. Results of statistic and permanent elongation En ligne : https://drive.google.com/file/d/1y1Y85oqFlnJQ5KqnmKJBAWxkOn1S0YI7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26712 [article]

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