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Direct packaging of components / Torsten Maenz in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 6 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 6 (2021) . - p. 12-16 Titre : Direct packaging of components : Thermoset injection molding of packages for electronic devices Type de document : texte imprimé Auteurs : Torsten Maenz, Auteur ; Martin Giersbeck, Auteur ; Gerrit Hülder, Auteur ; Armin Kech, Auteur Année de publication : 2021 Article en page(s) : p. 12-16 Langues : Anglais (eng) Catégories : Emballages en matières plastiques Equipements électroniques ou électriques (EEE) Matières plastiques -- Moulage par injection Matières plastiques -- Surmoulage Thermodurcissables Index. décimale : 668.4 Plastiques, vinyles Résumé : Thermosets are being increasingly used for packaging electronic devices, and offer good properties for this application. Direct overmolding of the components is particularly interesting here. However, achieving a successful product requires striking a balance between processability, thermal conductivity and reproducibility. Note de contenu : - More gentle processing compared to thermoplastics - Special features of the filling behavior - Power loss and thermal conductivity not proportional - Failures with to high cavity pressure - Differences between simulation and reality - Figure : In direct packaging, the electronic devices or components are directly overmolded with the molding compound - Fig. 1 : Thermal conductivity depending on the flow direction for different sheet thicknesses: with increasing sheet thickness, the thermal conductivity decreases in the x-direction and increases in the z-direction - Fig. 2 : Thermal conductivity (left) and power consumption (right; with/without convection) for 2 mm thick sheets of different thermoset molding compounds: the thermal conductivity and power consumption of the materials increase disproportionately to one another - Fig. 3 : Comparison of the cavity pressures for materials with lower (left) and higher (right) viscosity: at lower viscosity, the cavity pressure is significantly lower - Fig. 4 : Fault patterns in SMD and THT electrolytic capacitors: higher cavity pressures can lead to damage of the devices - Fig. 5 : High-viscosity materials may result in displacement of the capacitor and consequent damage during filling (PCB = printed circuit board) - Fig. 6 : The comparison of real and simulated process pressures during thermoset injection molding discloses significant deviations in the simulation En ligne : https://drive.google.com/file/d/1HGeP_mx9l8Mddx3yVgu1GHNWIUCkRkeN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36171 [article]

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A machine strategy with extra automation / Susanne Palm in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 6 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 6 (2021) . - p. 17-19 Titre : A machine strategy with extra automation : At Goerlich, a turnkey plant replaces two machines with a vertical clampig unit Type de document : texte imprimé Auteurs : Susanne Palm, Auteur Année de publication : 2021 Article en page(s) : p. 17-19 Langues : Anglais (eng) Catégories : Automatisation Broches métalliques Composants électriques et électroniques Composites à fibres de verre Matières plastiques -- Appareils et matériel Matières plastiques dans les équipements électriques et électroniques Polybutylène téréphtalate Index. décimale : 668.4 Plastiques, vinyles Résumé : Thermosets are being increasingly used for packaging electronic devices, and offer good properties for this application. Direct overmolding of the components is particularly interesting here. However, achieving a successful product requires striking a balance between processability, thermal conductivity and reproducibility. Note de contenu : - Figure : Many subprocesses implemented in a confined - Automated parts testing in multiple steps - Smooth project flow - Figure : All upstream process steps are integrated in a very small space: after the pins have been punched out (right), a Scara robot places them in the correct position on a loading plate (left) so that the Multilift V robotic system can pick up 24 pins and insert them into the mold - Fig. 1 : The tasks of the gripper at the Multilift V are extremely varied and demanding in this application - Fig. 2 : Goerlich manufactures enclosures for vacuum sensors efficiently and flexibly with its compact turnkey system En ligne : https://drive.google.com/file/d/1phXWIkCxvtADtWnGJD3sU7y_3x2EM5mJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36172 [article]

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Injection molds for insulating stators and rotors / Stefan Dürr in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 6 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 6 (2021) . - p. 20-23 Titre : Injection molds for insulating stators and rotors : Overmolding as a prerequisite for cost-efficient, high-quality electric motors Type de document : texte imprimé Auteurs : Stefan Dürr, Auteur Année de publication : 2021 Article en page(s) : p. 20-23 Langues : Anglais (eng) Catégories : Composants électriques et électroniques Matières plastiques -- Surmoulage Moules d'injection -- Conception et construction Plastification Polysulfures de phénylène Rotors Stator Le stator est la partie fixe d'une machine rotative. La partie rotative d'une machine, dite rotor, tourne normalement dans le stator. Des exemples de telles machines sont les pompes et les moteurs Stator d'une machine électrique Le stator d'une machine électrique est la partie stationnaire d'un moteur électrique ou d'un alternateur. Selon la configuration de la machine, le stator peut créer un champ magnétique qui par interaction avec le champ magnétique rotorique produit le couple électromécanique. Le stator peut être constitué d'aimants permanents ou d'électroaimants. Index. décimale : 668.4 Plastiques, vinyles Résumé : Electrical components are made from conductive and nonconductive materials. Pressure of competition makes it necessary to reduce the number of components and work steps and to streamline assembly. The moldmaker Mühlbeyer uses a hybrid technology for manufacturing stators and rotors, in which the contact material and plastic are permanently bonded in one production step. Note de contenu : - The insulating materials are as important as the conductor materials - Mold components are more expensive at high mold temperatures - Flow guides assist filling in thin-walled regions - There are consequences to how precisely the inserts are positioned - Figure : Various plastic-coated stators. During overmolding of the sheet components, not only insulation but also technical functions can be incorporated - Fig. 1. Examples of plastic-coated rotors - Fig. 2. Stator coated with a polyphenylene sulfide (PPS) - Fig. 3. Plastic-coated stator with additional technical functions. U/V/W refers to the electrical connection (motor star connection, S = star point) - Fig. 4. Fixed half of a 4-cavity injection mold for plastic-coated stators. Along side the main application of mold in close-up view - Fig. 5. 4-cavity mold (moving half) for a stator, which runs on a round-table machine. It contains a CVe monitor for electronic mold monitoring, which displays number of shots, cycle time and percentage utilization on the display - Fig. 6. Fully automated manufacturing line: the 4-cavity mold for stators – consisting of a mold upper part and two mold lower parts mounted on the round table – including handling, was designed and constructed by Mühlbeyer En ligne : https://drive.google.com/file/d/1kpoAK4Uj71GbNkGQZNDBJQk0JXZfaYTt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36173 [article]

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A simple cascade / Franciska Thomas in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 6 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 6 (2021) . - p. 24-27 Titre : A simple cascade : Sequential injection with a 6-fold valve gate system for a floor grate Type de document : texte imprimé Auteurs : Franciska Thomas, Auteur Année de publication : 2021 Article en page(s) : p. 24-27 Langues : Anglais (eng) Catégories : Canaux chauffants Matières plastiques -- Moulage par injection Moules d'injection -- Conception et construction Index. décimale : 668.4 Plastiques, vinyles Résumé : Products intended for use in building services must meet very high quality requirements in terms of both their constituent materials and functionality. A single-cavity mold for a floor grate made by Barku, which appears to be a simple part at first glance, called for a certain level of technical sophistication. This was provided by a moldmaker with the necessary technical understanding and hot-runner manufacturer Witosa who, between them, devised the right solution for what proved nevertheless to be a complex mold. Note de contenu : - Six individual drives for cascade control - Challenges for the mold maker and hot runner manufacturer - Coated needles for process optimization - Production in the USA - Fig. 1 : Fully wired 6-fold valve gate system (DS-40.200) including tubing for pneumatic control of the individual NK4 drive units - Fig. 2 : Simulated temperature distribution of the hot runner system in the heated state En ligne : https://drive.google.com/file/d/1i_ooPPzRGwWrwqDefsgeYtklfBJS10ub/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36174 [article]

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Colors for the high-performance sector / Bernhard Scheffold in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 6 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 6 (2021) . - p. 31-33 Titre : Colors for the high-performance sector : How plastics processors find the most suitable colorants for high-performance polymers Type de document : texte imprimé Auteurs : Bernhard Scheffold, Auteur Année de publication : 2021 Article en page(s) : p. 31-33 Langues : Anglais (eng) Catégories : Colorants Matières plastiques -- Coloration Pigments inorganiques Polymères hautes performances Résistance thermique Index. décimale : 668.4 Plastiques, vinyles Résumé : Colored plastics are not just a marketing gimmick, but fulfill important functions with technical components. In particular, they warn of hazards and permit the fast and direct identification of components. However, when coloring such plastic components, the processors are faced with several difficulties. For example, the colorants used must exhibit long-term resistance to high temperatures and must not impair the polymer’s mechanical properties. Therefore, when selecting the colorant, compounders and processors must observe several important points. Note de contenu : - Finding the most suitable masterbatch jointly - Observing reflectance curves and additives - Organic or inorganic colorants ? - Colorants stable up to 380°C - Fig. 1 : For color matching, large DIN A5 test panels (210 x 148 x 4 mm, shot weight about 135 g) are produced on a 200-ton injection molder - Fig. 2 : A co-rotating twin-screw extruder with coupled strand pelletizer is used for masterbatch production - Fig. 3 : Individual inscription of colored panels is possible with the digital flat bed printing technology - Fig. 4 : The customer’s sample is inspected visually in the Color Competence Center, and the feasibility of the requirements investigated - Fig. 5 : The colorist responsible for color development evaluates the color by means of injection molded sample platelets - Table 1 : Mohs hardness of different inorganic pigments En ligne : https://drive.google.com/file/d/1TezDfTgXMtDa1VR2gcK37m6qCJiU-JPa/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36175 [article]

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Repairing instead of replacing / David Rabe in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 6 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 6 (2021) . - p. 34-36 Titre : Repairing instead of replacing : Process for repairing CFRP components without machining Type de document : texte imprimé Auteurs : David Rabe, Auteur ; Philippa Böhnke, Auteur ; Thi Anh My Huynh, Auteur ; Iris Kruppke, Auteur ; Thomas Gereke, Auteur ; Eric Häntzsche, Auteur ; Chokri Cherif, Auteur Année de publication : 2021 Article en page(s) : p. 34-36 Langues : Anglais (eng) Catégories : Composites -- Réparation Composites à fibres de carbone Coût -- Contrôle Fibres à orientation unidirectionnelle Patchs de réparation Rayonnement ultraviolet Structures multicouches Tricot Index. décimale : 668.4 Plastiques, vinyles Résumé : CFRP components are often in continuous use under harsh environmental conditions, for example in aircraft and motor vehicles. If any damage occurs, the CFRP structures are simply replaced by new components in most cases. This is mainly due to the high cost of established repair methods. With a newly developed process, defective CFRP structures can now be repaired locally much more easily. Note de contenu : - Three process steps to the repaired CFRP component - Simulation as a basis - UV light instead of manual ablation - Tests with UD, TFP and MLG patches - Costs reduced by 80 percent - Fig. 1 : Overview of the simulation-based repair method for CFRP components: the method enables targeted repair of the damaged area - Fig. 2 : In the process, the damaged area of the test specimen (1) is treated with a UV LED lamp (see Fig. 3). The fibers are then separated (3) in the repair area (2) thus exposed. The prepared repair area (4) is then cleaned, activated and prepared by an adhesion promoter for the insertion of the patch - Fig. 3 : Matrix removal in the repair area is carried out with the help of an UV LED lamp. Compared to conventional processes, the manual effort is highly reduced, which ensures higher reproducibility - Fig. 4 : For the repair, for example, a TFP patch is inserted into the prepared site (A – first patch part inserted, B – second patch part inserted). For the subsequent reinfiltration (C), a method based on the VARI process is used - Fig. 5 : Rupture force (F max) and elongation at F max for the different patch variants : The UD and MLG patches achieve the best values En ligne : https://drive.google.com/file/d/1BHkov2psRWJmmN5IaLr9k_L_tpLUbZcq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36176 [article]

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How tightly sealed are connectors really ? / Achim Frick in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 6 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 6 (2021) . - p. 37-40 Titre : How tightly sealed are connectors really ? : Measurement method for the exact leakage determination of polymer-metal hybrid parts Type de document : texte imprimé Auteurs : Achim Frick, Auteur ; Marcel Spadaro, Auteur ; Markus Rettenberger, Auteur ; Michael Gehde, Auteur Année de publication : 2021 Article en page(s) : p. 37-40 Langues : Anglais (eng) Catégories : Adhésion métal/polymère Assemblages multimatériaux Connecteurs électriques Cuivre Etanchéité Matières plastiques -- Moulage par injection Perméation Polypropylène Index. décimale : 668.4 Plastiques, vinyles Résumé : The interfacial tightness of hybrid polymer-metal parts such as injection-molded connectors represents a decisive quality characteristic. Until now, however, there has been a lack of suitable measurement technology with which to quantify the media tightness of such molded parts. A new method delivers significantly more accurate results than previous test methods. Note de contenu : - Limits of the differential pressure leakage method - The new DTP method - Setup for the comparison of the measurement methods - Only one method shows clear differencees - Figure : The DDP method enables more accurate determination of the tightness of polymer-metal hybrids - Fig. 1 : Tthree-dimensional view of a test specimen with metal insert and test specimen located between pressure and measuring chamber, arrows show possible permeation paths and interfacial leakage paths - Fig. 2 : Leakage measurement results using different measuring methods on the same samples at 23 °C (averages from five measurements each): in contrast to the differential pressure method, clear differences in the leakage rate can be seen with the helium vacuum test - Fig. 3 : Differentiation between permeation and interfacial leakage determined by using DTPM on thermally post-treated, adhesion-modified polymer-metal hybrids at 23 °C: thermal post-treatment of the hybrid parts clearly influences the leakage rate as well as its development over time - Table : Injection molding conditions for the production of the investigated test specimens En ligne : https://drive.google.com/file/d/1DtKqECMAMcGQYjiiim4f_NE-Q2CV4kUQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36177 [article]

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Heat transfer with plastics versus metals / Tobias Epple in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 6 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 6 (2021) . - p. 41-43 Titre : Heat transfer with plastics versus metals : Which fillers are best suited for thermally conductive plastics, and how they can help replace metals Type de document : texte imprimé Auteurs : Tobias Epple, Auteur Année de publication : 2021 Article en page(s) : p. 41-43 Langues : Anglais (eng) Catégories : Charges (matériaux) Matières plastiques -- Additifs Métaux -- Suppression ou remplacement Polyamide 6 Thermocinétique Index. décimale : 668.4 Plastiques, vinyles Résumé : For many components, the use of metal-replacing plastics is an attractive possibility e. g. to save weight and benefit from enhanced design freedom. In various applications, however, the thermal conductivity of the polymers is of equal importance. There are different additives that can be used to enhance this property. In the development of two polyamide families, Domo Engineered Materials investigated which of those additives are especially useful to this end, and applied Light Flash Analysis to examine the materials. Note de contenu : - Two additives ahead of the rest - Part geometry determines thermal conductivity - Two measuring methods, one device - Metals often over-designed - Two case stories - Figure : By way of adapting the specimen, the LFA 467 HyperFlash device from Netzsch enables both through-plane and in-plane TC measuring - Fig. 1 : In-plane thermal conductivity measuring of PA6 with various different fillers: the thermal conductivity (TC) depends on the additive. In some cases it rises considerably at an additive content of 40 % or higher - Fig. 2 : Through-plane thermal conductivity measuring of PA6 with various different fillers: boron nitride and graphite deliver the best values - Fig. 3 : Combined results of in-plane and through-plane thermal conductivity measuring: isotropic materials show TC values on the bisector of the quadrant. The TC values of anisotropic materials are far away from the axis. Therefore, proper material selection must not only take the TC value in consideration, but also the part geometry - Fig. 4 : By way of adapting the specimen, the LFA 467 HyperFlash device from Netzsch enables both through-plane and in-plane TC measuring - Fig. 5 : Example of heat transfer through the heat sink of an LED: the heat (T2) on surface A passes through the heat sink (heat flow Q) and can then dissipate to the environment. The difference between T1 and T2 results in the thermal conductivity (h) - Table : Comparison of thermal conductivities of plastics and metal: the higher the thermal conductivity of the material, the smaller the difference in temperature between both points En ligne : https://drive.google.com/file/d/1dtsdpVbwWksFJP2uhQLGbFYRAGCmWf2F/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36178 [article]

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High voltage in cars / Doris Abt in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 6 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 6 (2021) . - p. 44-46 Titre : High voltage in cars : Polyamide specialties for electromobility Type de document : texte imprimé Auteurs : Doris Abt, Auteur Année de publication : 2021 Article en page(s) : p. 44-46 Langues : Anglais (eng) Catégories : Polyamide 12 Polymères -- Propriétés thermomécaniques Véhicules électriques Index. décimale : 668.4 Plastiques, vinyles Résumé : Electrical architecture in an E-car is significantly more challenging than for conventionally powered vehicles. Particularly for insulation of high-voltage (HV) components, the demands on the materials used are increasing. With specially-tailored materials for electric vehicles, challenges in automotive high-voltage technology can be overcome. Note de contenu : - Improved volume resistivity in comparison to PA12 - Less stress cracking due to good thermal expansionbehavior - Low influence - Figure : Insulation of high-voltage components in electric vehicles makes high demands on the materials used - Fig. 1 : Volume resistivity of Grilamid TR XE 10991 shows a more stable performance at high temperatures compared to PA12 - Fig. 2 : Grilamid TR XE 10991 exhibits clearly higher dielectric strength in both a dry and conditioned state than PA12 - Fig. 3 : Grilamid TR XE 10991 exhibits a higher heat deflection temperature (HDT) under load than PA12 - Fig. 4 : While the elongation at yield of PA12 differs in a dry and conditioned state by 195 %, the behavior of Grilamid TR XE 10991 remains virtually unchanged En ligne : https://drive.google.com/file/d/1VDh9j4XOqDflP6Pc8RXL4o8FJOtZv8G1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36179 [article]

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Lightweight to fit in a pocket / Dirk Bonefeld in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 6 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 6 (2021) . - p. 47-49 Titre : Lightweight to fit in a pocket : Composites reduces weight and simplify production of electronics housings Type de document : texte imprimé Auteurs : Dirk Bonefeld, Auteur ; Stefan Seidel, Auteur Année de publication : 2021 Article en page(s) : p. 47-49 Langues : Anglais (eng) Catégories : Biopolymères Boitiers Composites à fibres Composites à fibres de carbone Equipements électroniques ou électriques (EEE) Fibres continues Matériaux -- Allègement Matières plastiques -- Recyclage Polymères 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. Index. décimale : 668.4 Plastiques, vinyles Résumé : Continuous fiber-reinforced thermoplastic composites have also become established with thin-walled housings for consumer electronics and information technology. Not only do they offer high stiffness and help to reduce weight, but also enable the integration of classy appearance and functions. What is more, if the housings are produced using the hybrid molding process, costs, processing steps, and cycle times can be reduced. Note de contenu : - Off-tool parts with demanding surfaces - Reinforcing ribs produced easily - Fully bio : semi-finished biopolymer items with bio-based reinforcememnt - Figure : - Fig. 1 : Schematic of hybrid molding sequence with rapid heating/cooling temperature control : thanks to fast heating and cooling of the mold, the resulting component surfaces can be painted directly - Fig. 2 : Comparison of bending properties of standard materials for consumer electronics and IT equipment housings: Tepex dynalite semi-finished items with a halogen-free flame-retardant PC matrix are superior to die-cast metals, particularly in the system deformation test - Fig. 3 : Tepex organosheets are easily recycled and subsequently reused for technical components. Strength, stiffness, and toughness of the recyclate correspond to those of short fiber-reinforced plastics with the same fiber contents - Fig. 4 : Reusable water bottles are made of high-purity transparent PC, which is approved for foodstuffs contact. Tepex recyclates, which are used e. g. for laptop housings, benefit from these properties En ligne : https://drive.google.com/file/d/1M3R8wPJentAO3kuhJ3dmflxswqgLIOOk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36180 [article]

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