Directed air flow / Fabian Kayatz in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 10 (10/2018)

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 10 (10/2018) . - p. 60-63 Titre : Directed air flow : Forming air impact technology for formed parts with higher quality Type de document : texte imprimé Auteurs : Fabian Kayatz, Auteur ; Simon Wagner, Auteur ; Andre Schult, Auteur ; Manuel Münsch, Auteur ; Jens-Peter Majschak, Auteur ; Antonio Delgado, Auteur Année de publication : 2018 Article en page(s) : p. 60-63 Langues : Anglais (eng) Catégories : Matières plastiques -- Thermoformage Index. décimale : 668.4 Plastiques, vinyles Résumé : The material distribution is often the main quality criterion in thermoforming. A precisely directed air flow can influence the local thickness of semi-finished products without the need for complex plug pre-stretching devices. A further advantage: the process is particularly easy to implement. Note de contenu : - Conventional technologies - Experimental and simulation results - Forming Air Impact Technology - Fig. 1 : Compressed air negative forming via FIT in a rotationally symmetric tool : a) experimental set-up, b) molded part geometry and position of the measurement point - Fig. 2 : Flow speed of the fluid (m/s) when using Forming Air Impact technology with a central nozzle in the forming tool - Fig. 3 : Normalized thickness of A-PET at point M1 as a function of different parameters for a combination of the ring and central nozzles - Fig. 4 : Comparison of the semi-finished product temperature during conventional negative pressure forming and using Forming Air Impact Technology. Right the time-temperature profile when using Forming Air Imact Technology (rotation axis in Fig. 1) - Table : Nozzle parameters and parameter regions investigated in the simulation studies Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31453 [article]

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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 Dérayures de cuir 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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New developments in thermoforming / Fabian Kayatz in KUNSTSTOFFE INTERNATIONAL, Vol. 107, N° 4 (04/2017)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 107, N° 4 (04/2017) . - p. 24-26 Titre : New developments in thermoforming : Material characterization, simulation, and quality evaluation Type de document : texte imprimé Auteurs : Fabian Kayatz, Auteur ; Andre Schult, Auteur ; Jens-Peter Majschak, Auteur ; Andrea Liebmann, Auteur Année de publication : 2017 Article en page(s) : p. 24-26 Langues : Anglais (eng) Catégories : Epaisseur -- Mesure Matières plastiques -- Thermoformage Mesure Qualité -- Contrôle Simulation, Méthode de Index. décimale : 668.4 Plastiques, vinyles Résumé : Increasing requirements on molded plastic components are presenting new challenges for machine manufacturers and users. These are being addressed by novel processes for optimizing the wall thickness and the development of innovative measuring methods and advanced models for simulating thermoforming. Note de contenu : - Goals of the development work - Simulation models - Evaluation of the quality of the molded components - FIGURES : 1. Conformable electronics : Example of formed, printed electronics - 2. Simultaneous orthogonal stretching of the gripper : prototype for validating the hose clamp - 3. Modular setup : thermoforming tests stand at the Fraunhofer IVV Dresden - 4. Measurement result : The wall thickness (blue) of the molded plastic component (white) is measured perpendicular to the surface En ligne : https://drive.google.com/file/d/1JPM_JUkV_kSx6LNy7UPDl3VpxAFvpy-6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28476 [article]

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