Accueil
KUNSTSTOFFE INTERNATIONAL . Vol. 110, N° 6Mention de date : 2020Paru le : 26/08/2020 |
Dépouillements
Ajouter le résultat dans votre panierExciting design instead of exciting manufacturing / Reinhard Jakobi in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 6 (2020)
[article]
Titre : Exciting design instead of exciting manufacturing : A 3D-printed nozzle and modified dosing method deliver reproducible marbling in a robust process Type de document : texte imprimé Auteurs : Reinhard Jakobi, Auteur ; Angelika Homes, Auteur ; Susanne Zeiher, Auteur Année de publication : 2020 Article en page(s) : p. 10-12 Langues : Anglais (eng) Catégories : Marbrage
Matériaux -- Application-dosage
Matières plastiques -- Appareils et matériel
Matières plastiques -- DécorationIndex. décimale : 668.4 Plastiques, vinyles Résumé : Marbling is often a real eye-catcher in plastic components. However, the effect is difficult to create and there are some pitfalls when it comes to reproducibility. Novel nozzles for injection molding machines in combination with a special dosing technology allow marbled molded parts to be produced far more easily in a much more robust process Note de contenu : - Just one plasticizing unit*
- Figure : Marbling leads to attractively designed molded plastic parts, but is not so easy to implement in production
- Fig. 1 : All kinds of marbling effects can be achieved, depending on the channel geometry employed
- Fig. 2 : Not only flat molded parts but also attractive three-dimensional articles can be produced with a marblinhg effect. Correct dosing and the combination of "contrast" batches and coloring component during production are also important
- Fig. 3 : Molds fitted with hot runners and tunnel sprues can be used to produce very attractive patterns. As these molde are not injected from a central point the marbling streaks vary in their pattern
- Fig. 4 : Nozzle inserts made by 3D printing offer designers huge freedom of design. Flow-optimized channel geometries in the nozzles can be used to make the melt swirl on its way into the mold. This also supports the creaction of rotationally symmetrical patterns
- Fig. 5 : The surface finish of the mold cavity influences the appearance of the samples. Highly polished surfaces strongly accentuate contrasts. Textured surfaces leads to a matt appearance
- Table 1 : Influencing factors on the marblingEn ligne : https://drive.google.com/file/d/1FX7djN3tqbpO5aDc6ubT-ZCPBKLAnCxo/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34708
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 6 (2020) . - p. 10-12[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21871 - Périodique Bibliothèque principale Documentaires Disponible
[article]
Titre : White without titanium-dioxide : Porous nanostructures as replacement for white pigments Type de document : texte imprimé Auteurs : Luisa Borgmann, Auteur ; Julia Syurik, Auteur ; Hendrik Hölscher, Auteur Année de publication : 2020 Article en page(s) : p. 13-16 Langues : Anglais (eng) Catégories : Blanc (couleur)
Dioxyde de titane -- Suppression ou remplacement
Films plastiques
Matériaux poreux
Mousses plastiques
Nanostructures
Nanotechnologie
Polylactique, AcideL'acide polylactique (anglais : polylactic acid, abrégé en PLA) est un polymère entièrement biodégradable utilisé dans l'alimentation pour l'emballage des œufs et plus récemment pour remplacer les sacs et cabas en plastiques jusqu'ici distribués dans les commerces. Il est utilisé également en chirurgie où les sutures sont réalisées avec des polymères biodégradables qui sont décomposés par réaction avec l’eau ou sous l’action d’enzymes. Il est également utilisé pour les nouveaux essais de stent biodégradable.
Le PLA peut-être obtenu à partir d'amidon de maïs, ce qui en fait la première alternative naturelle au polyéthylène (le terme de bioplastique est utilisé). En effet, l'acide polylactique est un produit résultant de la fermentation des sucres ou de l'amidon sous l'effet de bactéries synthétisant l'acide lactique. Dans un second temps, l'acide lactique est polymérisé par un nouveau procédé de fermentation, pour devenir de l'acide polylactique.
Ce procédé conduit à des polymères avec des masses molaires relativement basses. Afin de produire un acide polylactique avec des masses molaires plus élevées, l'acide polylactique produit par condensation de l'acide lactique est dépolymérisé, produisant du lactide, qui est à son tour polymérisé par ouverture de cycle.
Le PLA est donc l’un de ces polymères, dans lequel les longues molécules filiformes sont construites par la réaction d’un groupement acide et d’une molécule d’acide lactique sur le groupement hydroxyle d’une autre pour donner une jonction ester. Dans le corps, la réaction se fait en sens inverse et l’acide lactique ainsi libéré est incorporé dans le processus métabolique normal. On obtient un polymère plus résistant en utilisant l'acide glycolique, soit seul, soit combiné à l’acide lactique.
Polyméthacrylate de méthyleLe poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec.
PolyuréthanesIndex. décimale : 668.4 Plastiques, vinyles Résumé : An innovative process allows to fabricate thin, white polymer surfaces without white pigments. For that, the polymer is foamed with supercritical CO2 resulting in a fine structure of nanobubbles. Film thicknesses of a few 10 µm are sufficient to obtain a perfect white surface. Note de contenu : - White color due to foaming
- Suitable for PMMA, TPU and PLA
- Fig. 1 : The scanning electron microscopy images shows the inside of a scale of the white beetle Cyphochilus insulanus. The porous structure consists of chitin and scatters light so well that a layer thickness of only 10 µm is sufficient to make it appear white
- Fig. 2 : Foaming with supercritical CO2 enables the creation of nano-sized pores in polymers such as PMMA. This means that tha actually transparent material turns white without adding pigments due to the structure alone
- Fig. 3 : The graph on the left shows the reflection as a function of wavelength for different film thicknesses. The SEM images shows the inner structure of an approx. 10 µm thick foamed PMMA film. The graph on the right compares the foamed PMMA films with other white materials
- Fig. 4 : The process is also suitable for foaming PMMA particles. In the future, these particles will be further tested for their suitability as pigmentsEn ligne : https://drive.google.com/file/d/1CqmuEsyMb1Cney9II5T6xr0f-sXPn7qY/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34709
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 6 (2020) . - p. 13-16[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21871 - Périodique Bibliothèque principale Documentaires Disponible Inline qualiti monitoring and data-based quality prediction / Alexander Schulze Struchtrup in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 6 (2020)
[article]
Titre : Inline qualiti monitoring and data-based quality prediction : successfully managing digital transformation with automation and artificial intelligence Type de document : texte imprimé Auteurs : Alexander Schulze Struchtrup, Auteur ; Alexander Mahl, Auteur ; Dimitri Kvaktun, Auteur ; Martin Thalemann, Auteur ; Reinhard Schiffers, Auteur Année de publication : 2020 Article en page(s) : p. 17-20 Langues : Anglais (eng) Catégories : Automatisation
Etanchéité
Industrie 4.0Le 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.
Intelligence artificielle
Matières plastiques -- Moulage par injection
Qualité -- Contrôle
Surveillance électroniqueIndex. décimale : 668.4 Plastiques, vinyles Résumé : Maintaining competitiveness while producing in Germany requires not only cost-efficient production, but also high-quality products. Vorwerk Elektrowerke is accepting this challenge. In collaboration with the Institute of Product Engineering at the University of Duisburg-Essen, Germany, the company is testing a 100 % inline quality monitoring system as well as a quality prediction using machine learning. Note de contenu : - Tightness as the ultimate goal
- Inline assessment of the molding contour
- Maximum usability
- Machine learning for the prediction of quality features
- Reliable performance
- Autonomous processes, low reject rate
- Fig. 1 : The contour of the molded part is crucial for the functionality of the sealing lip (TPE) of the filter cover
- Fig. 2 : The CV-X camera system used has a monochrome sensor with a resolution of 21 megapixels
- Fig. 3 : The automatic model generation relates to only little effort for the user : once the learning data has been provided, everything else runs automatically
- Fig. 4 : The achieved model performances show that a prediction of the quality characteristics based on the process data is well possible. The requirements for this are precise quality dataEn ligne : https://drive.google.com/file/d/1mF_1NyHJhoIEWPfw3Xs_iE_SPL7OlKzD/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34710
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 6 (2020) . - p. 17-20[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21871 - Périodique Bibliothèque principale Documentaires Disponible "You can see what is happening in the mold" / Eberhard Duffner in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 6 (2020)
[article]
Titre : "You can see what is happening in the mold" : Interview with Eberhard Duffner and Paul F. Filz by the Magazine Kunststoffe Type de document : texte imprimé Auteurs : Eberhard Duffner, Personne interviewée ; Paul F. Filz, Personne interviewée Année de publication : 2020 Article en page(s) : p. 21-24 Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection
Simulation par ordinateur
Temps de remplissage (technologie)Index. décimale : 668.4 Plastiques, vinyles Résumé : The 2019 K fair focused on the fusion of digital methods with analog production processes. At the fair, Arburg and Simcon showcased a filling process proceeding in real-time, as a 3D animation, on the display of a machine control panel, for an example of sunglasses, made of PA12. All that was needed to prepare this, was to load the simulation model, as well as the geometry of the part, directly onto the machine controls. This sounds almost too easy to be true. Right ? En ligne : https://drive.google.com/file/d/1tyVfybOFt8AunVaU-GB-Xk_bXUWd4HOU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34711
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 6 (2020) . - p. 21-24[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21871 - Périodique Bibliothèque principale Documentaires Disponible A bike frame from an injection molding machine / Tim Hacken in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 6 (2020)
[article]
Titre : A bike frame from an injection molding machine : Controlling complex development and manufacturing process, using simulation Type de document : texte imprimé Auteurs : Tim Hacken, Auteur ; Daniel Maier, Auteur Année de publication : 2020 Article en page(s) : p. 25-27 Langues : Anglais (eng) Catégories : Cadre de vélo
Composites thermoplastiques -- Moulage par injection
Procédés de fabrication
Simulation par ordinateur
Véhicules électriquesIndex. décimale : 668.4 Plastiques, vinyles Résumé : The toolmaker Siebenwurst uses injection molding simulation to optimize part design and production processes in its routine workflows. Among other things, Simcon’s software ensures the quality and dimensional ‧accuracy of the plastic frame for the first series-produced injection molded e-bike Note de contenu : - Two halves of a shell, glued together
- Simulation reveals distortion problems and gap formation
- Entire production process in focus
- Component changes during the design phase of the tool
- Evaluate feasibility and profitability
- Fig. 1 : In the dimensionally stable hollow structure of the frame made of a thermolastic fiber-plastic composite, the battery, cable and motor can be integrated into a novel, flat design
- Fig. 2 : Shrinkage and warpage during injection molding were calculated by simulation and the position and well thickness of reinforcing struts inside the frame were improved
- Simulation of the cascade injection molding process : Fillinglevel(30%) just before opening the second stage ; filling level (73%) just before opening the third stage, filling level (98%) when siwitching overEn ligne : https://drive.google.com/file/d/17tsb2pRsSyOyfwdIVUFsvP7lgFGdHt07/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34712
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 6 (2020) . - p. 25-27[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21871 - Périodique Bibliothèque principale Documentaires Disponible
[article]
Titre : An eye for the essential : Software-based tape stacking with the aid of camera technology paves the way for thermoplastic composites Type de document : texte imprimé Auteurs : Norbert Müller, Auteur ; Paul Zwicklhuber, Auteur Année de publication : 2020 Article en page(s) : p. 28-31 Langues : Anglais (eng) Catégories : Bandes composites
Composites thermoplastiques
Essais dynamiques
Flexion (mécanique)
Logiciels
Matières plastiques -- Moulage par injection
Procédés de fabricationIndex. décimale : 668.4 Plastiques, vinyles Résumé : Thermoplastic tapes are expected to achieve great things, namely to shape the next generation of thermoplastic composites. This calls for highly accurate tape stacking. At the same time, tape processing must not ‧become so complex that it becomes uneconomical. Engel contributes this technology to achieve a breakthrough by combining high-precision control software with camera technology in tape stacking. Note de contenu : - Higher structural performance
- Stacking accuracy determines quality
- The influence of gap and overlap
- Taking correction values into account for each stacking position
- High performance in real time
- Pck-and-place for hybrid stacks too
- Glas fibers and carbon fibers for different load ranges
- Fig. 1 : The laboratory production line is designed for stack dimensions up to 460 x 360 mm
- Fig. 2 : Flexural beidning test with tape blanks featuring deliberately incorporated defects : gaps and overlaps each reduce the impact strength compared with the blank produced with optimal butt alignment
- Fig. 3 : Search fields for determining edge runs : measurements are taken at 25 positions to join the points together by means of a line of best fit
- Fig. 4 : The corner position results from the detemrined edge runs. This method is much more accurate than direct optical measurement because tapes do not always have sharp corners
- Fig. 5 : The ready-cut tape are separated at the stacking magazines and held in position on pick tables for collection by the robotsEn ligne : https://drive.google.com/file/d/1ZvSzznrQ_vdcOkFAU1ahsA_-mZJlXIEv/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34713
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 6 (2020) . - p. 28-31[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21871 - Périodique Bibliothèque principale Documentaires Disponible Advantages through sustainable temperature-control technology / Lisa Völker in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 6 (2020)
[article]
Titre : Advantages through sustainable temperature-control technology : Even in difficult economic times, it is worthwhile investing in energy-efficient temperature control Type de document : texte imprimé Auteurs : Lisa Völker, Auteur ; Ralf Radke, Auteur Année de publication : 2020 Article en page(s) : p. 32-35 Langues : Anglais (eng) Catégories : Economies d'énergie
Matières plastiques -- Moulage par injection
Pompes centrifuges
Température -- ContrôleIndex. décimale : 668.4 Plastiques, vinyles Résumé : Climate protection is still on the global agenda, even if its relative importance has changed recently in the public perception. Many so-called “low carbon footprint technologies” are already available and could be utilized immediately in plastics processing. But what carbon reduction measures are not only environmentally effective? Using practical examples, gwk shows how the use of efficient temperature-control technology rapidly pays off economically, too. Note de contenu : - Potential in temperature-control with centrifugal pumps
- A comparison of investment and energy costs
- The bigger the pump, the bigger the potential savings
- Fig. 1 : Differences in power consumption and quantity ratio
- Fig. 2 : Comparison of the characteristics of the pump types (pressure/delivery). The greater pump performance, the greater the energy advantge in favor of the centrifugal pump
- Fig. 3: Comparison of heating strategies : direct heat transfer wins out thanks to high heating rates in a small space, sustained high efficiency, a low weight and amodest isulation requirement, as well as the possibility of small heating performance gradations and easy mechanical cleaning
- Table 1 : Comparison of the investment and energy costs of temperature-control equipment with small pumps in the performance range up to max. 40 l/min flow rate
- Table 2 : Comparison of the investment and energy costs of temperature-control equipment with medium-sized circulation pumps in the performance range up to max. 120 l/min flow rate
- Table 3 : Comparison of the investment and energy costs for the low-cost unit. In the illustrated example, the payback time of 2.5 years is reduced to only 0.2 years with support from public funds. In this case, too, a possible carbon tax leads to savings in the operating costsEn ligne : https://drive.google.com/file/d/1T-Tn-eKR-mVeUd9CZ_PdKwUO-Klh9asZ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34714
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 6 (2020) . - p. 32-35[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21871 - Périodique Bibliothèque principale Documentaires Disponible Nitrogen on tap - not from the bottle / Markus Berninger in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 6 (2020)
[article]
Titre : Nitrogen on tap - not from the bottle : Physicalo foaming makes plastic parts lighter and more stable Type de document : texte imprimé Auteurs : Markus Berninger, Auteur Année de publication : 2020 Article en page(s) : p. 36-37 Langues : Anglais (eng) Catégories : Azote
Matériaux -- Allègement
Matières plastiques dans les automobiles
Moules d'injection
Mousses plastiques -- Moulage par injectionIndex. décimale : 668.4 Plastiques, vinyles Résumé : Automotive supplier Pollmann uses an injection molding process to physically foam glass fiber-reinforced thermoplastics used in the production of electromechanical components that are installed in motor vehicles. The use of nitrogen as blowing agent makes the process more efficient and confers special properties on the components. An Inmatec generator in the Pollmann plant supplies nitrogen on demand and in the required amount. Note de contenu : - 4000 parts per shift
- Generator plus compressor system and buffer tank
- Payback period of about two years
- Figure : The housing for a doorlock system is manufactured by the MuCell
- Fig. 1 : The injectionmold has four cavities. Corresponding to a set of housings (two front and two rear doors) for each vehicle
- Fig. 2 : Inmatec nitrogen generator. The tank on the platform to the right is the product tank (150 l), into which the generated nitrogen is first introduced unde 6 bar. The second module on this platform is the compressor system. The large tank on the right is the buffer tank (500 l), which contains N2 at 25 bar from here, the pipeline leads to the injection molding machinesEn ligne : https://drive.google.com/file/d/1Y1DDOCV_rOK9PGPutt2dtR2oRuvQU04k/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34715
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 6 (2020) . - p. 36-37[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21871 - Périodique Bibliothèque principale Documentaires Disponible Understanding kneading holistically / Jochen Kettemann in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 6 (2020)
[article]
Titre : Understanding kneading holistically Titre original : Predict co-kneader behavior efficiently with procedural understanding Type de document : texte imprimé Auteurs : Jochen Kettemann, Auteur ; Christian Bonten, Auteur ; Rebecca Wolff, Auteur ; Johannes Rudloff, Auteur ; Marieluise Lang, Auteur ; Thomas Hochrein, Auteur ; Martin Bastian, Auteur Année de publication : 2020 Article en page(s) : p. 40-44 Langues : Anglais (eng) Catégories : Compoundage
Malaxeurs et mélangeurs
Polyéthylène
Polymères -- Fusion
Polystyrène
Simulation par ordinateurIndex. décimale : 668.4 Plastiques, vinyles Résumé : Thanks to its special working principle, the co-kneader fulfills top mixing requirements. Until now, however, its design could not be based on simulation, because processing knowledge and modeling approaches were lacking. Systematic investigation together with analytical and numerical models overcome this hurdle and provide the basis for computer-aided optimization. Note de contenu : - The co-kneader
- Experimental investigation
- Figure : A look inside the co-kneader whose behavior when processing polyethylene and polystyrene and polystyrene was simulated
- Fig. 1 : Power introduced and melt temperatures at the end of the extruder shown with various screw configuration at 8 kg/h throughput and 400 rpm
- Fig. 2 : Simplification of the calculation geometry with axial and radial boundaries using the example of a three-flight co-kneader (geometry 1)
- Fig. 3 : Simulated geometry variations : geometries 1 and 2 are three-flight co-kneaders, geometry 3 and 4 have 4 flights. The difference between geometry 1 and 2 is between flight width. Geometry 3 and 4 differ in respect to flight width and length
- Fig. 4 : Velocity profiles of characteristic flight positions of a four-flight co-kneader (geometry 3, KL element). The flow field was cut radially, a color scale shows the different velocities, arrows their direction
- Fig. 5 : Comparison of the average shear rates for geometries 1 to 4
- Fig. 6 : Comparison ofsimulated pressures, filling levels, and melting degrees of PE : conveying elements are interrupted in the screw drawing, and kneading elements are shown fully
- Fig. 7 : Comparison of simulated and measured values : The acumulated minimum or average dwell times and the powers, each for different operating points with PE as the matrix material
- Fig. 8 : Velocity field of a three-dimensional co-kneader simulation (four-flight kneader : geometry 3) in OpenFoam with real screw motion using the Immersed boundary Surface methodEn ligne : https://drive.google.com/file/d/1bhvfMlKf5O1WUijrt0SdSzP2wYPFghIP/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34716
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 6 (2020) . - p. 40-44[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21871 - Périodique Bibliothèque principale Documentaires Disponible
[article]
Titre : Uniting glass and plastic : Innovative glass-plastic hybrid combinations through precise laser structuring Type de document : texte imprimé Auteurs : Nam-Phong Nguyen, Auteur ; Jan Schabel, Auteur Année de publication : 2020 Article en page(s) : p. 45-47 Langues : Anglais (eng) Catégories : Assemblages (technologie)
Assemblages multimatériaux
Micrographie
Polycarbonates
Soudage laser
Structuration directe par laser
VerreIndex. décimale : 668.4 Plastiques, vinyles Résumé : Transparent functional and design elements often consist of glass and plastic materials. But there may be problems in bonding them using adhesives or adhesion promoters, since adhesives only have limited aging resistance and glass is usually not easily wetted. High-strength hybrid connections are made possible with a two-step process, in which a laser first creates micro- and nanoscale structures in the glass, into which the plastic melt can subsequently penetrate. Note de contenu : - Laser-structuring of glass materials
- Joining with new laser wavelength
- Factors influencing the bond strength
- Laser structuring of a glass sample by means of CO2 laser radiation : the microstructures are introduced into a glass substrate with a thickness of 3 mm at spacings of 1 mm. This is performed by means of a scanner system, which guides the laser beam over the glass substrate in multiple passes at high speed. When the laser beam impinges on it, the material is vaporized ; the ablated particles can be seen as a yellow jet of flame
- Fig. 1 : Glass- plastic hybrid bonds combine the specific advantages of the two material classes. A typical application is a car headlamp, which requires high transparency and shape flexibility
- Fig. 2 : Laser-based manufacture of a glass-plastic bond in two steps : Laser structuring and laser joining
- Fig. 3 : Glass-plastic hybrid bond after joining : the structured glass sample forms a firm bond with the planar sample of polycarbonate. The plastic was irradiated in the region of the microstructures on an area of 10 mm x 20 mm. Due to the high transparency of a the two joint parts, the molten region can hardly be seen with the naked eye
- Fig. 4 : Micrograph of the microstructures : the glass is ablated layer by means of a USP laser beam. Compared to machining by CO laser beam, the high-precision ablation can generate structures with hardly any damage.En ligne : https://drive.google.com/file/d/1tLXMfrHXT0yX1xES0SYw_ZfaaVd9tKHi/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34717
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 6 (2020) . - p. 45-47[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21871 - Périodique Bibliothèque principale Documentaires Disponible Glossy components without painting / Ronny Ebling in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 6 (2020)
[article]
Titre : Glossy components without painting : Aliphatic high-performance polyamide for plastic surfaces Type de document : texte imprimé Auteurs : Ronny Ebling, Auteur ; Philipp Harder, Auteur Année de publication : 2020 Article en page(s) : p. 48-49 Langues : Anglais (eng) Catégories : Brillance (optique)
Composites à fibres de verre
PolyamidesUn 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.
Polymères -- Surfaces
Polymères aliphatiquesIndex. décimale : 668.4 Plastiques, vinyles Résumé : Optics play an increasingly important role in plastic components. Glossy and even surfaces are decisive for an attractive appearance. With glass fiber-reinforced polyamides (PA), these requirements can usually only be achieved with an additional coating. A PA specially developed for surface design offers an alternative approach. Note de contenu : - Improved surface quality and high stiffness
- First class uniformity despite a higher glass fiber content
- Gloss and hardness combined
- Varied range of use
- Figure : For visible components, an even, glossy surface is often desired, which is often difficult to achieve with glass fiber-reinforced PA. PA Grivory G7V from EMS now solves this problem
- Fig. 1 : Grivory G7V achieves significantly smoother surfaces at the same mold temperature than PA6 and PA66 with the same glass fiber content. This minimizes wear and tear and ensures reduced noise development
- Fig. 2 : Even as a basic variant with a glass fiber content of 40%, Grivory G7V has less warpage than PA6 and PA66 with the same glass fiber content. With specially treated X grades, warpage can be halved again
- Fig. 3 : Due to its significantly harder surface, Grivory G7V is less sensitive to scratches than conventional PA typesEn ligne : https://drive.google.com/file/d/1VioWIt9wQf3MuKCjibDEdF7HKMDsF20T/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34718
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 6 (2020) . - p. 48-49[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21871 - Périodique Bibliothèque principale Documentaires Disponible
Exemplaires (1)
Code-barres | Cote | Support | Localisation | Section | Disponibilité |
---|---|---|---|---|---|
21871 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |