Heat development at the knife roller during leather shaving / Tilman Witt in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 11 p. Titre : Heat development at the knife roller during leather shaving Type de document : texte imprimé Auteurs : Tilman Witt, Auteur ; Anke Mondschein, Auteur ; Jens-Peter Majschak, Auteur ; Michael Meyer, Auteur Année de publication : 2021 Article en page(s) : 11 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux Cuirs et peaux -- Analyse Cylindre à couteaux Dérayage Eléments finis, Méthode des Thermocinétique Thermographie Thermométrie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather, which is regularly tanned from whole hides of up to 5 m2, needs a constant thickness over the entire surface in order to be processed into high-quality consumer goods such as shoes, furniture and car interiors. Precise adjustment of the thickness is achieved by shaving. On an industrial scale, rotating knife rollers are used to remove chips from the flesh side of semi-finished leathers whereby adjusting the specified thickness and generating a smooth surface. Care must be taken to prevent the temperature from rising above the denaturation temperature of the leather during shaving in order to avoid any loss of quality. Beside this, temperature rise is always a sign of friction showing avoidable energy expenditure. In order to localize the source of friction during shaving, actual temperature development at the roller knife is studied. Different measuring methods are used to evaluate the temperature increase at the blade roll of the shaving machine. The finite element method is used to thermally simulate the process. Measured temperatures, the geometry of the blade roll and process data are taken into account for modelling the temperature development close to the blade edge. The obtained results enhance the understanding of temperature generating processes during machine operation and allow conclusions about potential improvements in the design of the machine and blades. Note de contenu : - INTRODUCTION : Leather reactions to thermal stress - The shaving machine - Cutting principle and energy consumption - MATERIALS AND METHODS : Pre tanned leathers and shaving - Analysis of shaved hides - High speed infrared imaging - Temperature measurement of the cutting tool - Measurement of the roller turning speed - Thermal modelling with finite element method - Calculating the heat transfer coefficient - RESULTS : Thermography - Thermistor measurements - Transient finite element simulation - Analysis of shaved hides - Table 1 : Rizzi LW 3200 Shaving Machine Characteristics - Table 2 : Relevant material properties of steel - Table 3 : Selected material values for the surrounding fluid DOI : https://doi.org/10.1186/s42825-021-00057-0 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00057-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37543 [article]

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