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A clean sweep / Virgilio Perez Guembe in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 8-10 Titre : A clean sweep : Vacuum pyrolysis Type de document : texte imprimé Auteurs : Virgilio Perez Guembe, Auteur Année de publication : 2022 Article en page(s) : p. 8-10 Langues : Anglais (eng) Catégories : Déplastification Matières plastiques -- Appareils et matériel Nettoyage thermique Pyrolyse La pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation. Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente. Index. décimale : 668.4 Plastiques, vinyles Résumé : No matter whether injection molding or extrusion is involved: residue plastic stuck to screws, molds, or filters will impair system efficiency during production. Recyclates tend to build up more quickly than virgin material on machine elements. Schwing Technologies achieves good results with thermal cleaning by vacuum pyrolysis. Note de contenu : - Recyclate often exhibit low viscosity when processed - Plastics removal : a comparison of procedures : Manual cleaning - Mechnical cleaning - Chemical cleaning - Thermal cleaning - How vacuum pyrolysis works - Workpieces weighing five tons lie up to 40 hours in the vacuum oven - Cleaning also availagle as a service including pick-up and delivery En ligne : https://drive.google.com/file/d/1SGxv3Li-K5w1Txn-7Q2vS0lWaZTrIg1x/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37955 [article]

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Fiber dust formation during the recycling of FRP / Lisa Tölle in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 12-15 Titre : Fiber dust formation during the recycling of FRP : Mechanical recycling of fiber-reinforced plastics Type de document : texte imprimé Auteurs : Lisa Tölle, Auteur ; Matthias Hopp, Auteur ; Jürgen Bünger, Auteur ; Götz Westphal, Auteur ; Nina Rosenkranz, Auteur ; Christian Monsé, Auteur Année de publication : 2022 Article en page(s) : p. 12-15 Langues : Anglais (eng) Catégories : Analyse toxicologique Composites à fibres -- Recyclage Composites à fibres de verre Fragmentation Polyamide 6 Polypropylène Poussière -- Analyse Index. décimale : 668.4 Plastiques, vinyles Résumé : During the shredding of fiber-reinforced plastics, fiber fragments are released that settle on the skin and clothing, which can lead to itching and may possibly also be inhaled. In a project on the subject of fiber dusts, a study is being carried out on how toxic such fiber fragments are, and which shredding technology is most suitable for preventing – or at least reducing – the release of inhalable fibers. Note de contenu : - Measuring and analyzing airborne fibers dusts - Influence of the process parameters - Estimating dust formation recommended measures - Fig. 1 : Mass-based nanoparticle concentration resulting from the shredding of the GFPP and GF-PA6 organic sheets using different shredding parameters - Fig. 2 : Mass-based particle concentration in the microscale size range, which resulted from the shredding of the organic sheets under different shredding parameters - Fig. 3 : Inhalable dust mass resulting from the shredding of the organic sheets. The dust mass has been standardized by dividing it through the mass of the input material and the quantity of the filtered air - Fig. 4 : Scanning electron micrographs of the glass fiber dusts formed during the shredding of the GF-PA6 organic sheets - Fig. 5 : AlamarBlue Test for glass fiber sheets that were shredded at different speeds but with the same screen mesh width. No cytotoxicity is visible up to the largest quantity in the study En ligne : https://en.kunststoffe.de/a/specialistarticle/fiber-dust-formation-during-the-re [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37956 [article]

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Well filtered is better recycled / Christian Gassen in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 16-18 Titre : Well filtered is better recycled : Efficient filtration and cake washing for improved chemical recycling of PET Type de document : texte imprimé Auteurs : Christian Gassen, Auteur Année de publication : 2022 Article en page(s) : p. 16-18 Langues : Anglais (eng) Catégories : Compoundage Filtres Matières plastiques -- Recyclage Nettoyage Polyéthylène téréphtalate Recyclage chimique Solvolyse Index. décimale : 668.4 Plastiques, vinyles Résumé : Chemical recycling processes permit treatment of plastic waste – also if highly contaminated. The results are recyclates that have the same quality as virgin material. For example, newly developed processes enable used PET plastics to be returned to the material cycle. Hereby, the end products‘ quality is determined by the recycled material‘s purity. This can be significantly increased by means of efficient filtration and cake washing. Note de contenu : - chemical recycling : Products achieve the quality of virgin material - High monomer purity - MUlti-stage counterflow washing with lower consumption of resources - Solvolysis of PET - Rotary pressure filter for chemical recycling - High monomer yield with suitable solids/Liquids separation En ligne : https://drive.google.com/file/d/1zTZJd8C78jUkqsTFGggXE1uU3I_JF1Pa/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37957 [article]

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Start into a second life for plastics in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 20-21 Titre : Start into a second life for plastics : Conference minutes of "Forum Plastic recyclates" Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 20-21 Langues : Anglais (eng) Catégories : Matières plastiques -- Additifs Matières plastiques -- Recyclage Polyéthylène Index. décimale : 668.4 Plastiques, vinyles Résumé : growing number of companies and industrial sectors would like to use recyclates for their products. However, the application is frequently still confronted with considerable difficulties. And the extension of recycling to other fields and sectors also poses new questions. An overview of the current status and associated technical solutions was provided in conference “Forum Plastic Recyclates” at the end of March. Note de contenu : - Stabilization for PP and PE - No circular economy without additives - Additives as hindrance for recycling En ligne : https://drive.google.com/file/d/1qyb_Yi8iA2RHD5h4L8QMpP_5Xsop8MDP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37958 [article]

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Resting in good conscience in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 22-23 Titre : Resting in good conscience : Recycled hospital waste as raw material for 3D-printed furniture Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 22-23 Langues : Anglais (eng) Catégories : Ameublement Automatisation Déchets hospitaliers Impression tridimensionnelle Matières plastiques -- Recyclage Robots industriels Index. décimale : 668.4 Plastiques, vinyles Résumé : Robotics meets additive manufacturing: when Kuka robots produce furniture, they do not take work away from carpenters by any means. The chair and bench modules made of recycled hospital waste, named Twine – designed by HagenHinderdael in London – are a novelty in the world of furniture, engineering, and recycling. Note de contenu : - Delivering durability and aesthetics - without lifting a finger - Two robots and four filaments flows - Fully automated trajectories En ligne : https://drive.google.com/file/d/1xhipqugCAv8jziNUOVyGAfTr4CmdmRxw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37959 [article]

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Reinforcement on approach / Daniela Klotz in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 24-26 Titre : Reinforcement on approach : New applications for the automated production of fiber composite components Type de document : texte imprimé Auteurs : Daniela Klotz, Auteur Année de publication : 2022 Article en page(s) : p. 24-26 Langues : Anglais (eng) Catégories : Assemblages multimatériaux Automatisation Composites à fibres de carbone Drapage Industries aérospatiales -- Matériaux Placement automatisé de fibres Réservoirs (récipients) Structure en nid d'abeilles Index. décimale : 668.4 Plastiques, vinyles Résumé : Particularly two industries have shown considerable interest in FPP technology: aerospace industry in automating the lay-up processes of multi-material lightweight components with sandwich cores, as well as manufacturers of CFRP pressure vessels for hydrogen-powered vehicles (FCEVs), who can thus achieve savings in the double-digit percentage range. In both areas, FPP is the first technology to automate critical fiber lay-up processes in order to industrialize the production. Note de contenu : - Lay-up automation for complex, multi-material aerostructures - H2 composite tanks with FPP dome reinforcements - Customized production systems based on flexible modules - Fig. 1 : The FPP system combines several modules for feeding, cutting, material control, position control and fiber placement - Fig. 2 : The fiber material can be placed directly on the chamfered transition of a honeycomb core - Fig. 3 : The process also enables the combined lay-up of sandwich core skins and monolithic sections, as shown here for an aerospace component - Fig. 4 : The robotic system places the reinforcement patches directly on the dome areas of the pressure vessel En ligne : https://drive.google.com/file/d/1HKTvyTeadVSTq9hBMX97uYs7N02l_Q_A/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37960 [article]

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High gloss - Paintless and painless in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 28-31 Titre : High gloss - Paintless and painless : Predicting the surface finish of high-gloss plastic parts Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 28-31 Langues : Anglais (eng) Catégories : Brillance (optique) Composites à fibres de verre Matières plastiques -- Moulage par injection Polyamide 6 Polycarbonates Simulation par ordinateur Surfaces (technologie) Terpolymère acrylonitrile butadiène styrène Index. décimale : 668.4 Plastiques, vinyles Résumé : Skilful application of the evaluation and analytical options afforded by process simulation, including designing the best temperature-control system and making comparisons with alternative manufacturing processes, smoothes the way to efficient product development and manufacturing. Doing this from the very start of a project enables investments to be weighed and qualified, and technical, economic or environmental concerns to be taken into account, as exemplified here by a part with a high-gloss surface. Note de contenu : - Weighing the costs and benefits of variothermal temperature control - High-gloss surface – with limitations - Comparison of energy consumption: variothermal versus painting - Simulation for the purpose of cost estimation - All or nothing: high gloss on glass fiber - Painting needed or even possible ? Use empirical values - - Fig. 1 : The view of the mold interior in the simulation model shows the temperature difference at the end of the filling stage: variothermal control on the top side leads to higher mold temperatures than on the conventional temperature-controlled side (below) - Fig. 2 : The PC+ABS reference part had a high-gloss surface in both process variants, but weld lines were absent only in the variothermal variant - Fig. 3 : Particle tracking shows the temperature of the weld lines as they form. In the variothermal variant (right), the temperature of the melt fronts on the visible surface (top side) is still so high that they do not show up as weld lines - Fig. 4 : The simulation of the shear stresses (bottom) indicates the direction in which the downstream surface quality of the PA6-GF30 real part is likely to trend – shown here is the higher-quality surface produced by variothermal temperature control En ligne : https://en.kunststoffe.de/a/specialistarticle/high-gloss-paintless-and-painless- [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37961 [article]

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Achieving a more secure connection with the correct design / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 32-35 Titre : Achieving a more secure connection with the correct design : Higher process quality through adjustment of the production parameters Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Maximilian kramer, Auteur ; Elmar Moritzer, Auteur ; Christian Held, Auteur Année de publication : 2022 Article en page(s) : p. 32-35 Langues : Anglais (eng) Catégories : Assemblages (technologie) Matières plastiques -- Moulage par injection Thermodurcissables Vissage Index. décimale : 668.4 Plastiques, vinyles Résumé : In a research project being carried out by the IKV and KTP, the influence of geometric and process parameters on the quality of the screw connection in the direct assembly of thermosetting plastics has been analyzed. The research results show that, in addition to the geometric design, the production parameters offer additional optimization potential for the reliability of the screw connection. The compactness and curing degree of the parts exert the largest influence. Note de contenu : - Measuring the torque guarantees a reliable screw joint - Geometry influences flank coverage and quality of the screw connection - Injection molding parameters further optimize the quality of the screw joint - Fig. 1 : In order to better understand the influences exerted on direct screwing processes in thermoset molding compounds, the screw connection is designed and optimized in an iterative process - Fig. 2 : Sketch of the screw-in tube with the varied geometry parameters. A modular mold structure allows an analysis of the different tube geometries - Fig. 3 : Influence of the geometry parameters : a high differential torque provides for adequate space before failure of the screw connection and thus ensures a higher quality of the joint - Fig. 4 : Evaluation of the significance analysis: the largest influence on the quality of the screw connection comes from the holding phase and the subsequent curing time - Table 1 : Factors and steps for the injection molding tests En ligne : https://drive.google.com/file/d/1zuOz1HxK6i--bhJRf-CLfehTbIWoMLmD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37964 [article]

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Freedom from internal defects for brilliant images in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) Titre : Freedom from internal defects for brilliant images : New "optimelt sequence" software reduces microdefects in optical components Type de document : texte imprimé Année de publication : 2022 Langues : Anglais (eng) Catégories : Détection de défauts (Ingénierie) Logiciels Matériel optique Matières plastiques -- Moulage par injection Tomographie Index. décimale : 668.4 Plastiques, vinyles Résumé : Injection molding of optical components is subject to strict requirements, including freedom from internal defects. Tomography analysis methods can identify even microdefects in the order of 20 µm. The main cause of these very small defects are gases that enter the melt either from the material or the environment. With new software, Engel intends to reduce gas inclusions during the processing of transparent plastics and ensures a consistent high melt quality. Note de contenu : - Making the smallest defects visible - Customizable plasticizing is the key - Variability in the melt compression - Number of microvoids significantly lower - Outlook : light guides and mechanically stressed parts - Fig. 1 : Optical coherence tomography (OCT) provides two- and three-dimensional images from light-scattering samples with micrometer resolution - Fig. 2 : Volume rendering of an OCT measurement (left) – width of the measurement range: 3 mm – allows the lens cross-section to be identified. XY layers are derived from this. The image right illustrates the microvoids after speckle removal - Fig. 3 : Flow diagram: besides the backpressure generation by means of an axial advance of the screw (backpressure via screw position, left), pressure can also be generated by screw rotation - Fig. 4 : The numbers indicate the number of microvoids detected per lens in each case. The diagram makes clear that this number can be significantly reduced with optimelt sequence and the additional pressure application - Fig. 5 : With the use of optimelt sequence, the plastic lenses have significantly fewer microdefects (right). The lens in the OCT cross-section left was produced by standard injection molding En ligne : https://drive.google.com/file/d/1bBf1hWzSZLO4UeG-MRd8VtOCIhvbdczB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37965 [article]

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Vehicle chassis become 60 percent lighter in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 40-41 Titre : Vehicle chassis become 60 percent lighter : Pultrusion system for lightweight profiles Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 40-41 Langues : Anglais (eng) Catégories : Automobiles -- Chassis Composites à fibres de carbone Matériaux -- Allègement Matières plastiques dans les automobiles Pultrusion Index. décimale : 668.4 Plastiques, vinyles Résumé : Carbon Truck & Trailer GmbH invested in a pultrusion system of KraussMaffei subsidiary Pultrex. The iPul pultrusion system for lightweight profiles made of carbon fiber-reinforced plastic (CFRP) produces profile parts for around 70,000 vehicle chassis annually. Note de contenu : - Lower weight and higher payload - Production at high speed - Just in time - Fig. 1 : The injection box is the core of the iPul technology. Endless fiber rovings are soaked with a matrix in the box and formed into composite profiles - Fig. 2 : The chassis made from CFRP components are up to 60 % more lightweight than comparable steel designs that are produced at Carbon TT in Buxtehude, Germany. Pultrusion technology from Pultrex is the technical basis of the new production En ligne : https://drive.google.com/file/d/16R-oCb5MPTjKtyTHf-lwNXBQxYpRxZnF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37966 [article]

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Long fibers, smart look / Bernhard Pfeiffer in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 42-45 Titre : Long fibers, smart look : Tailgate of the Volkswagen ID.3 : Fiber-reinforced PP enables the use of plastics Type de document : texte imprimé Auteurs : Bernhard Pfeiffer, Auteur Année de publication : 2022 Article en page(s) : p. 42-45 Langues : Anglais (eng) Catégories : Assemblages collés Assemblages multimatériaux Automobiles -- Pièces Bandes composites Composites à fibres de verre Composites à fibres longues Hayons Le hayon sur une automobile, est l'ensemble constitué de la lunette arrière et de la porte de coffre, le tout s'ouvrant ensemble. Par extension on parle de voiture à hayon, en anglais carrosserie hatchback. Apparu dans les années 1950 chez Kaiser et les années 1960 sur les berlines familiales (Renault 4, Renault 16, Simca 1100…) et très populaire en France, ce type de carrosserie s'oppose aux berlines tricorps (trois volumes) à lunette arrière fixe. Il est généralement équipé d'un essuie-glace et d'un système de dégivrage. (Wikipedia) Matériaux -- Allègement Matières plastiques dans les automobiles Métaux Polypropylène Véhicules électriques Index. décimale : 668.4 Plastiques, vinyles Résumé : Until now, only metal has been used for the tailgates of VW cars. In its top of the line electric model, the ID.3, Volkswagen is now using a plastic-metal composite for the first time. One of the materials used for its production is a long glass fiber-reinforced polypropylene from Celanese. The material was required to not only satisfy the mechanical demands, but also enable an attractive appearance. Note de contenu : - Plastic/metal hybrid instead of steel - Extensive demands - Bonded instead of bolted - All additives incorporated in one step - Uv protection and odor requirements met with adapted formulation - Tapes could be used as substitutes for metal inserts - Tapes and injection molding material form a solid unit - Fig. 1 : The demands on the structural and visible part of the tailgate of the ID.3 electric runabout are numerous. They were met with various material modifications - Fig. 2 : One part of the tailgate is a visible interior part. The FRP used have a very good surface quality and therefore do not have to be additionally painted. They are supplied as pre-pigmented pellets in the desired vehicle interior color - Fig. 3 : Production of Celstran LFT : the pultrusion technology allows the fibers to be completely impregnated - Fig. 4 : Since the demands on the tailgate and rear spoiler support differ, they were produced using different materials - Fig. 5 : The strands produced by pultrusion can be rolled out into 300 mm wide tapes - Fig. 6 : Schematic illustration of the development of fully impregnated continuous fiber-reinforced tapes: the tapes can be wound onto spools and then processed by injection molding En ligne : https://drive.google.com/file/d/1Zs_n1U8brXswkyn7t_BHyTJ9lAYiNkdW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37967 [article]

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Lightweight construction for heavyweights / Lars-Fredrik Berg in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 46-49 Titre : Lightweight construction for heavyweights : Lightweight traction battery system for electromobility Type de document : texte imprimé Auteurs : Lars-Fredrik Berg, Auteur ; Johannes Liebertseder, Auteur ; Andreas Menrath, Auteur ; Philip Rosenberg, Auteur Année de publication : 2022 Article en page(s) : p. 46-49 Langues : Anglais (eng) Catégories : Accumulateurs lithium-ion Composés de moulage en feuille Composites à fibres Construction sandwich Matériaux -- Allègement Matières plastiques dans les automobiles Polyuréthanes Véhicules électriques Index. décimale : 668.4 Plastiques, vinyles Résumé : The battery system is one of the heaviest components in the powertrain of an electric vehicle. The use of lightweight materials and high-volume production processes according to requirements and functionality offers significant potential to reduce weight without compromising on safety or performance. A new technology concept shows the particular advantages of using a modified direct process with a tailored material selection. Note de contenu : - Lightweight structural module concept with integrated functions - Battery pack in hybrid design - SMC module end plates with integrated functions - Production of the sandwich base plate with the D-SCM process - Figure : Lightweight battery module with lithium-ion battery cells in pouch cell format and SMC module end plates - Fig. 1 : Cutaway model of the entire battery system - Fig. 2 : Schematic for the simple and efficient production of lightweight, highly rigid sandwich structures using the D-SCM process - Fig. 3 : Partial section of the battery module as a technology demonstrator with the functionally integrated SMC module end plates and the base plate manufactured using the D-SCM process En ligne : https://drive.google.com/file/d/1sSEj4OokAsL3yvSiRCasegPRpX3tnIIy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37968 [article]

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Support for a greener E&E world / Niklas Meine in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 50-53 Titre : Support for a greener E&E world : Driving sustainability trends in the electrical and electronics industry with polymers Type de document : texte imprimé Auteurs : Niklas Meine, Auteur Année de publication : 2022 Article en page(s) : p. 50-53 Langues : Anglais (eng) Catégories : Construction modulaire Matières plastiques -- Recyclage Matières plastiques dans les équipements électriques et électroniques Polycarbonates Index. décimale : 668.5 Parfums et cosmétiques Résumé : Electrical and electronics manufacturers want to reduce greenhouse gas emissions from their products and optimize waste management and recycling for them. This can be achieved, among other ways, by using more sustainable thermoplastics and quality-assured recyclates. A close cooperation between companies to establish material cycles and the recycling-friendly design of equipment are also important. Note de contenu : - A climate-neutral polycarbonate - Easy deployment as a drop-in solution - Recyclates with assured quality - Building material cycles together - Designing components for recycling - Fig. 1 : Charging stations for electric vehicles can also be manufactured in a more climate-friendly way using RE polycarbonates - Fig. 2 : PC from post-consumer recycling is used in the electronics industry, for example, to manufacture laptops - Fig. 3 : The modular design simplifies the repair and recycling of the smartphone “Fairphone” - Fig. 4 : The PC filament Polymaker PC-r for 3D printing is made from recycled plastic obtained from used water bottles from the Chinese water bottle manufacturer Nongfu Spring - Fig. 5 : The “Handbook for Circular Design” is aimed primarily at companies in the electrical, electronics and household appliance industries. It is intended to help them design products that are more circular and sustainable En ligne : https://drive.google.com/file/d/16S0ZvCwPHShMU1VMGmA10EoIFrkQ8tDe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37969 [article]

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Against the current / Sarah Luers in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 54-57 Titre : Against the current : How suitable are PA and PBT for high-voltage applications ? Type de document : texte imprimé Auteurs : Sarah Luers, Auteur ; Stefan Theiler, Auteur Année de publication : 2022 Article en page(s) : p. 54-57 Langues : Anglais (eng) Catégories : Composites à fibres de verre Humidité -- Absorption Matières plastiques dans les automobiles Polyamide 6 Polyamide 66 Polyamides Un polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine. Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères. Polybutylène téréphtalate Résistance électrique Température Index. décimale : 668.4 Plastiques, vinyles Résumé : Electromobility in particular, but also many other electrical applications, are asking for ever higher demands regarding the electrical properties of thermoplastics. This raises the question of whether the polymers commonly used in this area can still meet these demands. The plastics manufacturer, Lanxess, has now investigated how suitable, for example, polyamide and polybutylene terephthalate are for use at higher voltages and temperatures. Note de contenu : - More stringent demands, particularly in electromobility - Temperature influences the volume resistivity - Is the high moisture absorption of PA a problem ? - High electric strength, smaller components - High tracking resistance becoming increasingly important - CTI measurements at above 600 V make no sense - Guideline for component design at higher voltages - Fig. 1 : High-voltage connectors are a typical application for PA6, PA66 and PBT compounds - Fig. 2 ; Temperature dependence of the volume resistivity of glass fiber-reinforced PA6 and PBT compounds: the volume resistivity of PBT drops less sharply than that of polyamide at higher temperatures - Fig. 3 : Dependence of the volume resistivity on the moisture content, taking the example of a PA6-GF30 (Durethan BKV30H3.0) : the higher the moisture content, the lower the resistivity. The volume resistivity after moisture absorption drops more sharply at room temperature than at higher temperatures - Fig. 4 : Temperature dependence of the electric strength of glass fiber-reinforced PA6 and PBT compounds : PBT exhibits practically no change over the whole temperature range. With PA, however, a significant drop is to be observed above approx. 80 °C - Fig. 5 : Dependence of the electric strength on the specimen thickness for a PA6-GF30 (Durethan BKV30H3.0) at room temperature: the electric strength decreases sharply with increasing thickness. This is attributable in particular to the better heat dissipation with small wall thicknesses - Table 1 : Typical CTI values for compounds of PA6, PA66 and PBT En ligne : https://drive.google.com/file/d/1sKExsJQFxgpteLnaynqW-cjLy44guW7v/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37970 [article]

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Sharp look at reactive resins / Philipp Surray in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 58-61 Titre : Sharp look at reactive resins : Measuring cell enables characterization of fast-reacting polyurethanes and epoxy resins Type de document : texte imprimé Auteurs : Philipp Surray, Auteur ; Daniel Schneider, Auteur ; Kai Fischer, Auteur ; Christian Hopmann, Auteur Année de publication : 2022 Article en page(s) : p. 58-61 Langues : Anglais (eng) Catégories : Caractérisation Epoxydes Polymères -- Analyse Polyuréthanes Réactivité (chimie) Index. décimale : 668.4 Plastiques, vinyles Résumé : The processing of highly reactive resin systems requires a detailed understanding of the material behavior during component manufacture. The characterization of systems using DSC to date has reached its limits, especially in the case of polyurethanes. A specially developed measuring cell, on the other hand, delivers better results. Note de contenu : - Characterization of highly reactive polymers - Difficulties of PU characterization - Measuring cell for the analysis of highly reactive resin systems - Direct dosing of the reactive material into the measuring chamber - Measurement results agree with known values - Choice of baseline still decisive - Table 1 : Overview of EP and PU characterized by DSC - Table 2 : Evaluation of the indium calibration of the developed measuringcel - Fig. 1 : Thermograms of the reactions of an EP and two polyurethanes under non-isothermal conditions: the EP could be fully characterized. This is not the case for the PU - Fig. 2 : Measuring cell for thermal characterization of highly reactive resin systems: In contrast to DSC, the reactive material is dosed directly into the measuring chamber - Fig. 3 : Thermograms of the melting process of indium for four heating rates and a sample mass of 300 mg : the measurements strongly correspond to the melting temperatures reported in literature - Fig. 4 : Comparison of the exothermic reaction of the epoxy resin Epicote 04976 in a DSC measurement and in the IKV measuring cell : the values strongly agree. The choice of the baseline has a great influence on the result of the measurement En ligne : https://drive.google.com/file/d/1N-FEpTcfT_UBnx5aPEtOxm1nELt2EEEo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37971 [article]

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Well embedded in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) Titre : Well embedded : Welding small batch sizes economically using ultrasonics Type de document : texte imprimé Année de publication : 2022 Langues : Anglais (eng) Catégories : Matières plastiques -- Soudage Soudage -- Appareils et matériels Soudage par ultrasons Soudures Index. décimale : 668.4 Plastiques, vinyles Résumé : Joining methods often call for creativity – especially when small series are involved. Herrmann Ultraschall has developed an ultrasonic welding machine for a control unit manufacturer that inserts 18 brass female connectors into a plastic frame with high precision. The system has not only slashed cycle times and eliminated most of the manual work stages, but is also highly versatile. Re-tooling to weld inspection windows into plastic housings takes just a few minutes, thanks to its quick-change functionality. Note de contenu : - Five times as fast thanks to the special blade sonotrode - Sonotrode and workpiece fixture work hand in hand - A welding machine with change system for several applications - Basic training and individual consulting - Automated welding solutions pay off En ligne : https://drive.google.com/file/d/1zG8xB08NSK4ggi-viXeAjmyEkXEJ6sTs/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37972 [article]

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