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More gloss, less weld lines / Gerald Berger in KUNSTSTOFFE INTERNATIONAL, Vol. 101, N° 7 (07/2011)
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Titre : More gloss, less weld lines Type de document : texte imprimé Auteurs : Gerald Berger, Auteur ; Susanne Roock, Auteur ; Georg Steinbichler, Auteur ; Josef Giessauf, Auteur ; Dieter P. Gruber, Auteur ; Walter Friesenbichler, Auteur Année de publication : 2011 Article en page(s) : p. 26-29 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection Tags : 'Moulage injection' 'Contrôle température' processus' Variothermal 'Phase remplissage' Brillance Surfaces Index. décimale : 668.4 Plastiques, vinyles Résumé : Variothermal Temperature Control - In the filling phase, a higher contact temperature is required in order to achieve high-gloss surfaces or perfectly replicated microstructures and nanostructures. This is economically contra-productive, however, since only a low mold temperature enhances the cooling of the molding. Variothermal process control helps achieve both goals. Note de contenu : - Heating and injection parallel to the cycle
- Instrumental simulation of human perception
- Materials behave differently
- Influence on the roughness
- Grained surfaces, microstructures and nanostructuresPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14973
in KUNSTSTOFFE INTERNATIONAL > Vol. 101, N° 7 (07/2011) . - p. 26-29[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013214 - Périodique Bibliothèque principale Documentaires Disponible Replication of stochastic and geometric micro structures – Aspects of visual appearance / G. R. Berger in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 3 (07/2011)
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Titre : Replication of stochastic and geometric micro structures – Aspects of visual appearance Type de document : texte imprimé Auteurs : G. R. Berger, Auteur ; Dieter P. Gruber, Auteur ; Walter Friesenbichler, Auteur ; C. Teichert, Auteur ; M. Burgsteiner, Auteur Année de publication : 2011 Article en page(s) : p. 313-322 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection
Polycarbonates
Polymères cristallins
PolypropylèneTags : 'Moulage injection' Polypropylène hautement cristallin 'Polycarbonate 'Miscrostructures stochastiques' 'Microstructures géométriques' 'Aspect visuel' 'Réplication microstructures' Index. décimale : 668.4 Plastiques, vinyles Résumé : The surface quality of injection molded parts depends on the processing conditions, the cavity surface structure, the runner system, the used polymer and the part geometry. Different replication of the cavity surface structure to the molded part influences its surface function and visual appearance. A descriptive model of the replication process has been developed, taking into account the thickness of the frozen layer during injection. The expected dependencies were proven by systematic injection molding tests with geometric surface micro structures, having depths of 45 or 100 μm and widths from 400 to 2 000 μm, that were replicated into highcrystalline polypropylene (HCPP) and polycarbonate (PC). The volumetric structure replication ratio increased with rising mold temperature, melt temperature and cavity pressure. As expected, the mold temperature was dominant for very small micro features. The RMS roughness, determined by confocal microscopy and atomic-force microscopy, was found to be a suitable replication parameter for draw-polished to mirrorfinished stochastic cavity surface structures. An abrupt change in wall thickness decelerated the flow front velocity, thus decreased the replicated polymer surface roughness and increased the surface gloss. Moreover, a several micrometer high “surface step” remained, due to the different thicknessdependent shrinkage. This step always ascended from the thicker to the thinner part area. The replication of a mirrorfinished mold surface into HCPP was dominated by morphological effects. Local micro shrinkage differences led to micro sink marks, which affected the surface gloss much more than the mold surface structure. DOI : 10.3139/217.2451 En ligne : https://drive.google.com/file/d/1-0SMNhW1w25G6Z5ldo0iFFVthFdqYNeh/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12420
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 3 (07/2011) . - p. 313-322[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013159 - Périodique Bibliothèque principale Documentaires Disponible Tactile friction and perception of UV-curable coatings and their relation to physical surface parameters and contact mechanic simulation / Thomas Ules in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 6 (11/2023)
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Titre : Tactile friction and perception of UV-curable coatings and their relation to physical surface parameters and contact mechanic simulation Type de document : texte imprimé Auteurs : Thomas Ules, Auteur ; Michael GrieBer, Auteur ; Andreas Hausberger, Auteur ; Christian Schipfer, Auteur ; Mohammad Mansouri, Auteur ; Peter Fuchs, Auteur ; Sandra Schlögl, Auteur ; Dieter P. Gruber, Auteur Année de publication : 2023 Article en page(s) : p. 1803-1814 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Chimie des surfaces
Dureté (matériaux)
Eléments finis, Méthode des
Revêtements -- Séchage sous rayonnement ultraviolet
Revêtements organiques
Simulation, Méthode de
ToucherIndex. décimale : 667.9 Revêtements et enduits Résumé : In this paper, the results of new investigations on the relationship between physical surface parameters of polymer-based coatings, skin hydration levels and tactile friction are presented. For this purpose, the chemical composition of the investigated coatings was varied on the basis of the curing and binding agent and also with respect to the addition of selected fillers. This allowed the adjustment of various surface parameters such as hardness, surface wettability and roughness over a wide range. Tribological tests were carried out in which the coefficient of friction between the finger pad and the respective coating was measured for different skin hydration levels. A specially developed setup was used that minimized changing skin hydration levels during the experiments that would impede reproducible friction measurements. While for dry skin the perceived friction correlates well to the coefficient of friction and surface hardness, this is not the case for moist finger skin. The results are explained under the assumption of adhesion dominated friction and the application of the Hertz contact theory. This finding was further investigated through contact mechanic simulations using the finite element method (FEM). To this end, the contact area formation dependence on the reaction force was studied for surfaces of different hardness and skin with different mechanical properties reflecting various hydration levels. The results qualitatively confirmed the experimental findings and the analysis based on the Hertz contact theory. Note de contenu : - EXPERIMENTAL : Materials - Methods - FEM contact model
- RESULTS & DISCUSSION : Physical characterization - Tactile friction - Perception studies - Contact simulation
- Table 1 : Chemical composition of the UV-curable coatings (all formulations contained 2 wt% Irgacure TPO-L)
- Table 2 : Physical surface parameters of the investigated sample coatings
- Table 3 : Elastic moduli (in kPa) of the hyperelastic material model (neo-Hookean solid) for the single skin layers Stratum Corneum (SC), Epidermis (ED) and Dermis (D)DOI : https://doi.org/10.1007/s11998-023-00792-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00792-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40162
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 6 (11/2023) . - p. 1803-1814[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24337 - Périodique Bibliothèque principale Documentaires Disponible