More gloss, less weld lines / Gerald Berger in KUNSTSTOFFE INTERNATIONAL, Vol. 101, N° 7 (07/2011)

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 101, N° 7 (07/2011) . - p. 26-29 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 nanostructures Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14973 [article]

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Practically reliable viscosities for simulations / Walter Friesenbichler in KUNSTSTOFFE INTERNATIONAL, Vol. 100, N° 3/2010 (03/2010)

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 100, N° 3/2010 (03/2010) . - p. 16 - 20 Titre : Practically reliable viscosities for simulations Type de document : texte imprimé Auteurs : Walter Friesenbichler, Auteur ; Ivica Duretek, Auteur ; Jegadeesan Rajganesh, Auteur Année de publication : 2010 Article en page(s) : p. 16 - 20 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.4 Plastiques, vinyles Résumé : Pro4plast – part 4 - Injection molding - Project planning and feasibility are the be-all and end-all of a development process. The filling simulations required for this must be based on reliable viscosity data for the material. A special injection molding machine rheometer now allows processors and developers to establish this data themselves under realistic conditions. Note de contenu : - Rheometer - Sensors record pressure and temperature - Measuring the pressure dependence of the viscosity - Verification of the measuring system and evaluation software - Temperature correction available as an option Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9260 [article]

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Reducing costs through systematic development processes / Walter Friesenbichler in KUNSTSTOFFE INTERNATIONAL, Vol. 103, N° 7 (07/2013)

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 103, N° 7 (07/2013) . - p. 35-38 Titre : Reducing costs through systematic development processes Type de document : texte imprimé Auteurs : Walter Friesenbichler, Auteur ; Thomas Gröger, Auteur ; Christian Hopmann, Auteur Année de publication : 2013 Article en page(s) : p. 35-38 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Coût -- Contrôle Innovations Matières plastiques -- Moulage par injection Technique de la production Temps de cycle (production) -- Réduction Index. décimale : 668.4 Plastiques, vinyles Résumé : Product Development - Remaining competitive in the face of global competition requires innovation. The innovation and development process is thus one of the most important success factors in Europe. The European Cornet project "AdvancedPartSim" demonstrates with seven case studies that a systematic approach can reduce the time and cost outlay in the development of injection molding products by up to 30 %. Note de contenu : - Systematic procedure improves competitiveness - Simulation throughout the entire product development process - Learning by doing with case studies Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19164 [article]

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Replication of stochastic and geometric micro structures – Aspects of visual appearance / G. R. Berger in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 3 (07/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 3 (07/2011) . - p. 313-322 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 Polypropylène Tags : '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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12420 [article]

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Rubber injection molding with quality recognition / Thomas Hutterer in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 6-9 Titre : Rubber injection molding with quality recognition : Automatic process monitoring with iQ clamp control and machine learning Type de document : texte imprimé Auteurs : Thomas Hutterer, Auteur ; Gerald R. Berger-Weber, Auteur ; Roman C. Kerschbaumer, Auteur ; Walter Friesenbichler, Auteur ; Alexander Klutz, Auteur ; Thomas Leng, Auteur ; Karlheinz Mayr, Auteur Année de publication : 2021 Article en page(s) : p. 6-9 Langues : Anglais (eng) Catégories : Assurance qualité Caoutchouc Elastomères -- Moulage par injection Index. décimale : 668.4 Plastiques, vinyles Résumé : With the increasing digitalization of injection molding, new process parameters are coming under the spotlight. Engel, together with the Polymer Competence Center Leoben and Montan University Leoben, Austria, is using machine-learning methods to explore the potential of mold breathing for quality assurance in rubber injection molding. This research project was supported by the partner company SKF Sealing Solutions Austria. Note de contenu : - Trainings set as a basis for Subsequent inline error Identification - Determining dynamic material behavior - Correlation between mold breathing and cavity pressure - Process monitoring with principal component analysis - Fig. 1 : Mold breathing: The mold is compressed by the build-up of the clamping force. During filling, the resulting part generates an opening force, which is counteracted by the compression. The opening force is proportional to the cavity pressure and to the projected surface area - Fig. 2 : The maximum mold temperature at the cycle end follows immediately after the setpoint values of the heating elements - Fig. 3 : The tan(δ) values of the elastomer parts are strongly influenced by the mold temperature. SPE statistics allow changes in the process conditions potentially leading to rejects to be recognized - Fig. 4 : Mold breathing responds with a delay compared to the cavity pressure, but then simultaneously reaches a pronounced peak. Maxima of mold breathing and cavity pressure are strongly positively correlated - Table 1 : In preliminary tests, settings ensuring a stable manufacturing process were found for all process parameters. These parameters were held constant in all experiments En ligne : https://drive.google.com/file/d/1ByzLVJcNLyWQOSy5k_ghRzAgk3wVs-C-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35637 [article]

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Simulating the fatigue life of fiber-reinforced injection moldings / Christoph Guster in KUNSTSTOFFE INTERNATIONAL, Vol. 103, N° 9 (09/2013)

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Virtual process design in expansion injection molding / Georg Steinbichler in KUNSTSTOFFE INTERNATIONAL, Vol. 100, N° 10 (11/2010)

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