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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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Transparency in compounding / Pierre Pfeffer in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 10-13 Titre : Transparency in compounding : Inline testing methods for monitoring processes Type de document : texte imprimé Auteurs : Pierre Pfeffer, Auteur ; Norbert Halmen, Auteur ; Thomas Hochrein, Auteur ; Giovanni Schober, Auteur Année de publication : 2021 Article en page(s) : p. 10-13 Langues : Anglais (eng) Catégories : Analyse spectrale Assurance qualité Contrôle non destructif Matières plastiques Mesures optiques Micro-ondes Procédés de fabrication Térahertz Ultrasons Index. décimale : 668.4 Plastiques, vinyles Résumé : The quality of final products can be increased by using measurement technology for monitoring production processes. Interest in it is increasing especially for compounding. There are various existing methods of non-destructive testing that can also be used inline in the manufacturing process. The different methods are suitable for different applications: an overview of the current capabilities and limitations of the various inline methods. Note de contenu : - Ultrasonics : Proven, but temperature-dependent technology - Optical spectroscopy : Regulating color directly in production - Microwave and terahertz : Temperature-independent and non-contacting - The appropriate method for the particular application - Fig. 1 : An overview of electromagnetic and mechanical waves arranged in the order of frequency and wave length : The red colored areas represent the NDT methods used in plastics processing - Fig. 2 : Dependence of measurable ultrasonic amplitude (extinction coefficients) of filler content and the accompanying median size of chalk particles in plastics compounds: By using such databank-integrated calibration curves, both of these quality relevant features can be quantified inline by ultrasound - Fig. 3 : Process chain exemplified by color measurement of dyed plastics products: Dyed compounds are manufactured from various raw materials and processed further, either continuously by extrusion, or discontinuously to injection molded products. All along the process chain there are various possibilities for monitoring color quality - Fig. 4 : Dependence of a characteristic value, the so-called refractive index determined via terahertz from the degree of melting in a compound or the melt temperature: The degree of melting can be recorded inline by consulting a databank specific to the material - Fig. 5 : The dependence of so-called intensity, a characteristic value recorded via terahertz from the stochastic appearance of foreign materials in a compound (left), as well as a microscopic image of a machine-related wear particle in the melt (right): A threshold value (red line, left) can be defined by taking a variety of processing states into consideration beyond which the measuring signal can be univocally consigned to a foreign particle En ligne : https://drive.google.com/file/d/14HvEX29bLDS3vrJDpT7bgV9MOWqmqJhZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35712 [article]

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Quality right from the start / Torsten Urban in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 14-16 Titre : Quality right from the start : Qualification and gauge management software for injection-molded thermoplastic and thermoset parts Type de document : texte imprimé Auteurs : Torsten Urban, Auteur Année de publication : 2021 Article en page(s) : p. 14-16 Langues : Anglais (eng) Catégories : Assurance qualité Logiciels Matières plastiques Thermodurcissables Thermoplastiques Une matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire. Traçabilité Tags : 'Gestion  des  jauges'  Logiciels  'Matières  plastiques'  'Assurance  qualité' Index. décimale : 668.4 Plastiques, vinyles Résumé : At the beginning of every quality assurance effort lies the individual measurement value. If this value is measured incorrectly, the collected data is unreliable and has an undesirable effect on all downstream quality management processes. The Kunststoff-Institut Lüdenscheid relies on CAQ AG’s software solutions for gauge and qualification management in order to ensure consistently trained and qualified employees, calibrated test equipment, and valid measurement values right from the very beginning – even in today’s age of working from home and decentralized e-learning. Note de contenu : - Goodbye, Excel : Enter dedicated software solutions - Qualification matrix and training management in one software - The challenge : Managing 774 gauges and 373 test plans - Traceability and history - The benefits for KIMW : Efficient training management and reliable measurements - Fig. 1 : 774 gauges, 373 test plans, and 49 device managers are managed with the PMM.Net module © CAQ/KIMW - Fig. 2 : With the matrix in Qualify.Net, the qualification status of all employees at KIMW can be precisely determined at any time © CAQ/KIMW - Fig. 3 : View into KIMW's testing laboratory: The Lüdenscheid-based company devotes itself extensively to research on techniques and measures in the area of quality assurance for the plastics industry © CAQ/KIMW En ligne : https://drive.google.com/file/d/1zwEbsrNQqZ8HhJoQH5uEXHGFxHlCqqS6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35713 [article]

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Nozzle in protective position / Uwe Prüssmeier in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 18-19 Titre : Nozzle in protective position : XPlanar transports workspiece during plasma surface treatment process Type de document : texte imprimé Auteurs : Uwe Prüssmeier, Auteur Année de publication : 2021 Article en page(s) : p. 18-19 Langues : Anglais (eng) Catégories : Buse (tuyère) Industrie 4.0 Le concept d’Industrie 4.0 correspond à une nouvelle façon d’organiser les moyens de production : l’objectif est la mise en place d’usines dites "intelligentes" ("smart factories") capables d’une plus grande adaptabilité dans la production et d’une allocation plus efficace des ressources, ouvrant ainsi la voie à une nouvelle révolution industrielle. Ses bases technologiques sont l'Internet des objets et les systèmes cyber-physiques. Matières plastiques Moteurs planaires Technique des plasmas Traîtements de surface Traîtements de surface -- Appareils et matériels Index. décimale : 668.4 Plastiques, vinyles Résumé : The XPlanar motor system combines the advantages of conventional transport systems with magnetic levitation technology. This opens up completely new possibilities for handling and positioning products in the machining process. The floating effect obviates the need for mechanical guiding components and helps Plasmatreat to simplify the system configuration for plasma treatment. Note de contenu : - Planar motor system with floating movers - Integrating multiple processing and inspection stations - Figure : A floating planar mover carries the workpiece exactly into position for surface treatment - Fig. 1 : The new plasma treatment unit is highly compact as it no longer requires a 6-axis robot or additional linear axes - Fig. 3 : An electromagnetic field causes the movers to float and guides them over the XPlanar system with maximum freedom En ligne : https://drive.google.com/file/d/1_g_pYZr9E328woezSLQ1v8uShMioe2qm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35714 [article]

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Cracking product development / Cristoph Hinse in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 20-22 Titre : Cracking product development : When traditional approaches meet their micromechanical counterparts Type de document : texte imprimé Auteurs : Cristoph Hinse, Auteur ; Tobias Schäfer, Auteur Année de publication : 2021 Article en page(s) : p. 20-22 Langues : Anglais (eng) Catégories : Eléments finis, Méthode des Mousses plastiques -- Moulage par injection Mousses plastiques -- Propriétés mécaniques Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : In the realm of virtual product development, the idea of the cycle has been around for many years. But where does the cycle begin? When we take a closer look at this concept, new aspects rightly start to emerge. For example, whether it is possible or necessary to augment or expand existing, hitherto proven mechanisms so that goals can be achieved, or perhaps even surpassed - and, if so, how this is to be accomplished. Note de contenu : - Separate develoopment steps - Mechanical properties as the crux - Coupling of process simulation, material modeling and FEA - Fig. 1 : Stress-strain diagram as a function of microstructure. Shown are three different porosities (5 to 15 %) relative to the compact material - Fig. 2 : Panel of a household appliance as an example of successful virtual product developmeny - Fig. 3 : Result of the process simulation for the temperature control system of the panel - Fig. 4 : Simulated cell structure (left) and CT image (right) of a rib: a high degree of matching is evident - Fig. 5 : With the aid of the material cards generated and computed in Digimat, a three-point bending test was simulated in the FEA software, and was also carried out in parallel on the real component En ligne : https://drive.google.com/file/d/1-gU9cRLX_8PQtMSY9mFfPhWvmW_MQZnK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35715 [article]

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With broad sword and data collector / Peter Peschl in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 23-25 Titre : With broad sword and data collector : Walther faltsystem combines three mold technologies from the haidlmair group Type de document : texte imprimé Auteurs : Peter Peschl, Auteur Année de publication : 2021 Article en page(s) : p. 23-25 Langues : Anglais (eng) Catégories : Conception technique conteneurs Matières plastiques -- Moulage par injection Moules d'injection -- Conception et construction Mousses plastiques -- Moulage par injection Index. décimale : 668.4 Plastiques, vinyles Résumé : In plastics processing, efficient production methods are required, especially for articles with high volumes and exacting quality requirements, and these must be constantly optimized. The container specialist Walther Faltsysteme has been working together with the Austrian moldmaker Haidlmair for many years, and now, for the first time, two other companies from the Group have come into play in current projects, helping Walther to achieve higher productivity and production efficiency. Note de contenu : - Hotrunner with flat die for pallet runners and pallet deck - Focus on performance - Additional support for production reliability - Mould monitoring as a digital helper - Figure : Products which are manufactured using the technologies of the Haidlmair Group companies and an application example with folding boxes - Figure : FDU Midi (open version): This nozzle was used in this project with Walther Faltsysteme En ligne : https://drive.google.com/file/d/1EC-1MZXR27HJHLzy_nr9x455UfltKjA8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35716 [article]

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All about plasticizing screws / Filipp Pühringer in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 26-28 Titre : All about plasticizing screws : Part 3 of the series deals with the tests to optimize the screw geometry Type de document : texte imprimé Auteurs : Filipp Pühringer, Auteur Année de publication : 2021 Article en page(s) : p. 26-28 Langues : Anglais (eng) Catégories : Optimisation géométrique Simulation par ordinateur Vis de plastification Index. décimale : 668.4 Plastiques, vinyles Résumé : In the second part of the series, calculations were carried out on the throughput behaviour, pressure build-up capacity and the melting process on the basis of an exemplary geometry. These results are now to be examined in more detail and subsequently optimized. For this purpose, the effects of adjusting some selected geometry parameters have to be investigated and interpreted. Note de contenu : - Results of the first calculation - Step 1 of Optimizing the geometry : shortening the metering zone - Step 2 of optimizing the geometry : increasing the metering zone depth - A multi-purpose screw geometry - Table 1 : Geometry optimization, test 1 : Metering zone shortened, compression zone lengthened - Table 2 : Geometry optimization, test 2 : Screw with increased flight depth - Figure : Through empirical tests and simulation-supported test series, a screw can be designed in a tailor-made manner for the respective application - Fig. 1 : First test for geometry optimization : Pressure curve along the screw at stroke position 50 mm - Fig. 2 : Second test for geometry optimization : Pressure curve after the increase of flight depth by approx. 28 % En ligne : https://drive.google.com/file/d/1Z6rQQx6B7k2HHTGeODkZ0FRRlVhLsHlL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35717 [article]

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Molding on a joining element / Elmar Moritzer in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 29-32 Titre : Molding on a joining element : Study of the factors influencing the strength of the bond between a thermoplastic composite and a screw-in blind rivet Type de document : texte imprimé Auteurs : Elmar Moritzer, Auteur ; Johannes Hillemeyer, Auteur ; René Lotzin, Auteur Année de publication : 2021 Article en page(s) : p. 29-32 Langues : Anglais (eng) Catégories : Assemblages (technologie) Composites thermoplastiques Matières plastiques -- Moulage par injection Rivetage Le rivetage est un assemblage de pièces à l'aide de rivets. C'est un assemblage définitif, c’est-à-dire non démontable sans destruction de l'attache. Quoiqu'il existe depuis peu un type de rivet imprimant une empreinte helicoïdale, lors du montage, dans son logement, permettant ainsi un démontage et un remontage ultérieur sans destruction du rivet. Un autre procédé beaucoup plus élaboré est le rivetage par fluage radial : ce système est de nos jours le plus fiable des assemblages rivetés. Index. décimale : 668.4 Plastiques, vinyles Résumé : The thermoplastic matrix of the composite is nowadays often provided with ribs and functional elements in the injection molding process. In the same way, joining elements can also be molded on. The screw-in blind rivet is one such joining element with adequate one-sided accessibility, high strength properties and good economic efficiency. The question is: what factors influence the strength of the bond between the semi-finished product and the molded-on blind rivet ? Note de contenu : - Three molded-on screw-in blind rivets - What role is played by the geometry of the thermoplastic composite ? - What effect do different process parameters have ? - Fig. 1 : The three steps of the joining process for a screw-in blind rivet connection - Fig. 2 : The blind rivets are molded on through three drill holes in the thermoplastic composite with different diameters - Fig. 3. : Test set-up with joined screw-in blind rivet - Fig. 4 : Results of varying the geometry: In the experimental plan (VP), each new step is based on the best parameters from the previous step. D: Thickness of the thermoplastic composite; dB: Diameter of the drill hole - Fig. 5 : Variation of the injection molding parameters : The influence on the bond between the thermoplastic composite and the blind rivet can be seen from the results - Fig. 6 : Results of varying the diameter of the drill hole (top) and failure pattern (below ) ; blind rivet with plasticized matrix plastic and blind rivet after failure En ligne : https://drive.google.com/file/d/1pijV9lXWSqNaGta9HcNUIeEQLN4NooDX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35738 [article]

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The hydra among diode lasers / Michael Nagel in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 33-35 Titre : The hydra among diode lasers : Multiple processing heads in a row optimize processing speed Type de document : texte imprimé Auteurs : Michael Nagel, Auteur Année de publication : 2021 Article en page(s) : p. 33-35 Langues : Anglais (eng) Catégories : Composites à fibres de carbone Composites thermoplastiques Diodes lasers Fibres continues Matériaux -- Allègement Pose de rubans automatisée Index. décimale : 668.4 Plastiques, vinyles Résumé : Diode lasers are often used for the production of lightweight components by means of thermoplastic tape laying. However, common tape laying systems are noticeably limited in their production capacity, as they only work with one processing head. With a flexible multi-head system, Laserline GmbH promises a cost-efficient system that should also pay off in large-scale production. Note de contenu : - What the thermoplastic matrix systems score with - In the multi-head system, several processing heads work in a row - Flexible adjustment of the laser beam - Technical and economic advantages of the diode laser - Fig. 1 : In the case of rotationally symmetrical components such as pipes, shafts or pressure vessels, the tapes are placed in a kind of cross-winding on the rotating component - Fig. 2 : Laserline has developed the world's first rotating multi-kW diode laser that enables the production of endless pipes for short pipes or construction components by tape winding En ligne : https://drive.google.com/file/d/1jA-oqLEAfOyKt_1zxMIfsHLkBQMqiEfW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35739 [article]

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Recyclates on the test bench in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 36-39 Titre : Recyclates on the test bench : Incoming goods inspection of recyclates ensures reject minimization Type de document : texte imprimé Année de publication : 2021 Article en page(s) : p. 36-39 Langues : Anglais (eng) Catégories : Déchets -- Réduction Etat fondu (matériaux) Matières plastiques -- Recyclage Mesure Polystyrène Rhéologie Viscosité Index. décimale : 668.4 Plastiques, vinyles Résumé : Recyclates usually show altered properties compared to virgin plastics due to initial processing and influences during the product’s life. This often leads to problems during processing. Especially in melt-expanding processes such as injection stretch blow molding, blow molding, film blow molding or thermoforming a fast incoming goods inspection method for recyclates is important. The Institut für Kunststofftechnik (IKT) at the University of Stuttgart, Germany, has developed a new test method for this purpose. Note de contenu : - Influences of recycling on the material properties - Novel test method for recyclates at the IKT - Measuring the melt extensibility of recyclates - Fig. 1. The new and fast test method analyzes and identifies the melt extensibility of recyclates prior processing - Fig. 2. Influence of recycling cycles on the shear viscosity of polystyrene at 220 °C - Fig. 3. Schematic sequence of the novel test method to analyze and identify the melt extensibility of recycled plastics - Fig. 4. The advantages of the new test method lie in the fast and simple handling of the test procedure - Fig. 5. Time sequence and development of the melt tube during inflation of PS virgin material at 240 °C - Fig. 6. Pressure dependency analysis of PS virgin material at 240 °C - Fig. 7. Behavior of melt extensibility during inflation at 0.6 bar and 220 °C En ligne : https://drive.google.com/file/d/1bdtTvWJZOdYQFoDhyq55NcEMu6p-kd3L/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35740 [article]

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Targeted heating of high-performance polymers / Matthias Feiner in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 40-42 Titre : Targeted heating of high-performance polymers : Thermal management plays a crucial role in 3D printing of high-performance thermoplastics Type de document : texte imprimé Auteurs : Matthias Feiner, Auteur ; Uwe Popp, Auteur ; José Francisco Fernández, Auteur ; Martin Kipfmüller, Auteur Année de publication : 2021 Article en page(s) : p. 40-42 Langues : Anglais (eng) Catégories : Chauffage Impression tridimensionnelle Polyéther éther cétone Polymères hautes performances Index. décimale : 668.4 Plastiques, vinyles Résumé : When printing high-performance polymers such as PEEK, stresses occur in the component due to the relatively high printing temperature and the changes in the material structure. These stresses can lead to microcracking, warping, cracking and ultimately to component failure. In the Smart Printbed project, a system was developed to minimize these influences and also save electrical energy. Note de contenu : - The zone heating system supplies energy only where it is needed - Design of the smart print bed - Optimal thermal management requires perfect interaction - Fig. 1 : The smart printbed can heat, cool and measure temperature. The schematic sketch of the print bed shows the structure, which consists of 25 individual Peltier elements - Fig. 2 : It all depends on the correct wiring : Only with a bridge circuit can the Peltier elements assume all three operating states (heating, cooling and measuring) En ligne : https://drive.google.com/file/d/1f_paUzdVVUz1Ef5td0LM7XSuc9aDgNVC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35741 [article]

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Large but still economical / Ondrej Kotera in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 43-45 Titre : Large but still economical : An alternative approach to large-format 3D printing with plastic Type de document : texte imprimé Auteurs : Ondrej Kotera, Auteur ; Erik Lautzus, Auteur ; Jens Stein, Auteur ; Rico Fahr, Auteur ; Nick Backasch, Auteur ; Sebastian Scholz, Auteur ; Andreas Bierbaumer, Auteur ; Jens Liebhold, Auteur ; Alexander Knorr, Auteur Année de publication : 2021 Article en page(s) : p. 43-45 Langues : Anglais (eng) Catégories : Analyse thermique Extrudeuses Granulés plastiques Impression tridimensionnelle Matières plastiques -- Extrusion Index. décimale : 668.4 Plastiques, vinyles Résumé : In a joint project, the Fraunhofer Plastics Technology Center Oberlausitz, working together with the University of Zittau/Görlitz, as well as the industry partners KraussMaffei and Elbe Flugzeugwerke, has enhanced an extruder-based method for additive manufacturing of large-format plastic parts using a flexible melt pipe. Besides a proof of concept, there was also a focus on studies into how the parameters of the experimental set-up influence the output material resulting in the highest possible component quality. Note de contenu : - Decoupling the extruder unit from the 3D printing nozzle on the robot - Pressure fluctuations in the melt pipe - Influence of the material on the layer stability - Figure : Thermal analysis of the deposited plastic strand in the large-format, extruder-based 3D printing process - Fig. 1 : The extruder is coupled to a flexible melt pipe with the print head fixed on the industrial robot - Fig. 2 : The innovative print head permits pressure and temperature measurement of the plastic melt - Fig. 3 : The application performance of the Collin extruder (melt pipe DN16, printing nozzle 6 mm) has a linear deposition characteristic depending on the speed - Fig. 4 : The fiber length and the fiber content influence the layer stability and thus also the component quality - Fig. 5 : The residual temperature of the deposited plastic strands fundamentally influences the component strength in the build direction (Z-direction) En ligne : https://drive.google.com/file/d/17HB_wknJCxOv2GylAXW7N0hoiT565wt2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35742 [article]

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Geometry-independent surface finishing / Livia Carmen Wiedau in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 46-48 Titre : Geometry-independent surface finishing : Influence of chemical post-treatment on glass-filled polyamide 12 samples Type de document : texte imprimé Auteurs : Livia Carmen Wiedau, Auteur ; Anna Tarasova, Auteur ; Gerd Witt, Auteur Année de publication : 2021 Article en page(s) : p. 46-48 Langues : Anglais (eng) Catégories : Allongement à la rupture Charges (matériaux) Composites -- Propriétés mécaniques Composites à fibres de verre Frittage laser Polyamide 12 Résistance à la traction Rugosité Traitement chimique Verre Vitrification Index. décimale : 668.4 Plastiques, vinyles Résumé : In many technical applications, laser-sintered components still have inadequate surface topology. New methods of cost-effective and geometry-independent surface finishing of the laser-sintered specimens are therefore needed. Chemical post-treatment of laser-sintered PA12 components imparts enhanced mechanical characteristics as well as a reduction in roughness to ~85 %. Note de contenu : - Growing demand for post-treated additive manufacturing components - Post-treatment methods - Experimental setup - Chemical post-treatment - Surface roughness reduced - Influence of process parameters and chemical post-treatment - Fig. 1 : Elastic modulus and tensile strength of PA12 - Fig. 2 : Influence of post-treatment on glass-filled PA12 - Fig. 3 : Elastic modulus and tensile strength of glass-filled PA12 - Fig. 4 : Elongation at break of glass-filed PA12 - Table 1 : Process parameters for tensile specimens made of glass-filled and unfilled PA12 En ligne : https://drive.google.com/file/d/13q7b0s0j42nY15AFCCp3a-dA711KyzII/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35743 [article]

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Defying the sun in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 49 Titre : Defying the sun : Self-lubricating polyoxymethylene bearings for solar systems Type de document : texte imprimé Année de publication : 2021 Article en page(s) : p. 49 Langues : Anglais (eng) Catégories : Photopiles Polyoxyméthylène Résistance au rayonnement ultraviolet Index. décimale : 668.4 Plastiques, vinyles Résumé : Components in solar power stations are exposed to strong solar radiation and other severe environmental influences. The plastics used for this must withstand these harsh conditions. Tracking systems in photovoltaic plants are also subject to frictional wear. These challenges can be met with the aid of self-lubricating, UV-resistant plastic compounds. Note de contenu : - UV-Resistant POM Compounds - Figure : The self-lubricating EP-15 sliding bearings consist of a UV-resistant POM compound and therefore have long-term resistance to the intense solar radiation in photovoltaic plants En ligne : https://drive.google.com/file/d/1TaO-XbCgFqs487Ic_b_c8JwpaiVJZgm2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35744 [article]

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