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Assuring composite quality / Jan Poppensieker in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 6-8 Titre : Assuring composite quality : Automated optical inline inspection of fiber-reinforced plastics Type de document : texte imprimé Auteurs : Jan Poppensieker, Auteur Année de publication : 2018 Article en page(s) : p. 6-8 Langues : Anglais (eng) Catégories : Automatisation Composites à fibres Mesures optiques Qualité -- Contrôle Index. décimale : 668.4 Plastiques, vinyles Résumé : Composite carbone, glass and aramid fiber materials are extremely versatile and therefore ever more important for modern industry. Automated optical inspectionsystems can documents the production quality of web materials, and at the same time make a valuable contribution to process analysis intelligent production control. Note de contenu : - Composite materials for mobility and energy efficiency - Specialized system extensions - Documented quality and audit support - Production management intelligence - FIGURES : 1. Schematic arrangement of the inspection channels. Besides inspection by transmission, the top and bottom sides of the material are tested by reflection - 2. Example of a production defect in w woven multidirectional carbon material - 3. Identifying critical trends in advance : For reliable process control, the inspection software statistically processes important parameters, such as the trim widths or the "openness" of the material (ratio of total surface area toholes) and displays values that fall above or below the thresholds in red and green respectively - 4. Fuzz ball : accumulation of loose carbon fibers on the material. 3D recording of the height of the fibers over the material makes it possible to assess whether a critical defect is present En ligne : https://drive.google.com/file/d/153bfF6t5aokd7EGg7j4z9J0JdXaTx24U/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30081 [article]

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Chrome VI-free pretreatment of ABS / Dieter Lehmann in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 10-12 Titre : Chrome VI-free pretreatment of ABS : Metallized ABS moldings without chromosulfuric acid pickling Type de document : texte imprimé Auteurs : Dieter Lehmann, Auteur ; Jürgen Nagel, Auteur ; Philip Zimmermann, Auteur Année de publication : 2018 Article en page(s) : p. 10-12 Langues : Anglais (eng) Catégories : Chrome hexavalent -- Suppression ou remplacement Dépôt électrolytique Matières plastiques -- Métallisation Surfaces -- Nettoyage Terpolymère acrylonitrile butadiène styrène Traîtements de surface Index. décimale : 668.4 Plastiques, vinyles Résumé : Since September 21, 2017 the use of Cr(VI) compounds for pickling ABS surfaces is only possible with a temporary permit throughout the EU. Therefore, a substitute process is presented, which can be integrated into existing process chains, and creates high-grade, securely bonded metal plating. Note de contenu : - Conventional procedures for surface modification - Chemical modification and nickel deposit - High bonding strength through chemical coupling - Fig. 1. Diagram of the reactive surface modification of ABS with peracetic acid, the coupling of polyamine, and the embedding of palladium ions - Fig. 2. Surface of ABS molding with the conducting nickel layer after the cross-cut and adhesive tape tests En ligne : https://drive.google.com/file/d/1iivXbjkve7XSy3q_ZhvNXxKi1nuA4iOR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30082 [article]

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Variothermal temperature control from the compressed air network / Edwin Neugebauer in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 13-16 Titre : Variothermal temperature control from the compressed air network : Varioplast has developed a dynamic temperature control process which can be retrofitted to injection molds without theneed for any modifications Type de document : texte imprimé Auteurs : Edwin Neugebauer, Auteur ; Michael Däbritz, Auteur Année de publication : 2018 Article en page(s) : p. 13-16 Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection -- Appareils et matériel Température -- Contrôle Index. décimale : 668.4 Plastiques, vinyles Résumé : As a manufacturer of both coated and uncoated high-gloss plastic parts, Varioplast has continually been faced with the problem of visible knit and flow lines on molded parts. Conventional variothermal processes, for reasons of overall economics, are limited in their suitability to offset existing and future cost pressures exerted by customers. Varioplast unveiled a new process at Fakuma 2017. Note de contenu : - The idea : hot air from the nozzle - The heating module : designed for single and double-sided use - Process parameters : a system with scalable performance - Test results : production readiness confirmed - FIGURES : 1. In series production, the finished part is removed on the ejector side, while the cavity is heated in parallel on the nozzle side. The 3D-printed metallic heating head module permits quick adaptation to customer-specific geometries in the mold - 2. The turbotherm modules can be used on the nozzle and ejector side if required - 3. Surface on a molded part with and without turbotherm. A knit line is invisible in the first case, but visible in the second - 4. Representation of the surface temperature of the cavity in the machine cycle. A temperature rise from 5 to 10°C/s is possible, with the exact rate depending on the surface roughness - 5. Representation of the heating power in the machine cycle. The unit requires an average of approx. 1.4 kW power. Variothermal process control via the complete mold plates requires 20 to 30 times as much power - 6. The width of the knit line decreases strongly with heating time. It can be optically reduced by up to 100%, i.e. completely eliminated En ligne : https://drive.google.com/file/d/1gxBOXdonL9DepHK1iwwPjPouwMUpjV6T/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30083 [article]

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Less is more / Andreas Maucher in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 17-20 Titre : Less is more : Induction heating of injection molds can be optimized by targeted heating of specific mold areas Type de document : texte imprimé Auteurs : Andreas Maucher, Auteur ; Wolfgang Schinköthe, Auteur Année de publication : 2018 Article en page(s) : p. 17-20 Langues : Anglais (eng) Catégories : Chauffage par induction Matières plastiques -- Moulage par injection -- Appareils et matériel Temps de cycle (production) -- Réduction Index. décimale : 668.4 Plastiques, vinyles Résumé : In variothermal injection molding, induction heating is one of the fastest and most efficient methods of heating. But even this method has great potential for increased efficiency. Through targeted temperature management and heating of clearly defined mold areas, valuable cycle time can be saved. Note de contenu : - Temperature management by air gaps - A copper layer directs the induced eddy currents - Combination of the two variants - Measurements on the actual construction - Faster heating with less energy - FIGURES : 1. Depending on requirements, external or internal arrangement of the inductor is recommended - 2. CAD model of part of the coated test geometry. Longitudinal section and cross section. The inductor in the inductor channel is not shown - 3. Qualitative comparison between thermal simulations of a solid material strip and a copper-coated air gap strip. The latter is only heated in the central uncoated block - 4. Actual test construction made from tool steel 1.2312 (black, lacquered). The holes allow the temperature curve to be measured En ligne : https://drive.google.com/file/d/1NMgqPQowUuj8lgjgZ5ptMWmhkA5VnwR2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30084 [article]

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Lightweight electric motors / Susanne Palm in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 21-23 Titre : Lightweight electric motors : In the ProLemo Joint Project, four companies and KIT are developing flexible technologies for series production of lightweight electric motors Type de document : texte imprimé Auteurs : Susanne Palm, Auteur Année de publication : 2018 Article en page(s) : p. 21-23 Langues : Anglais (eng) Catégories : Charges (matériaux) Composites à fibres Composites thermoplastiques Matériaux -- Allègement Matières plastiques -- Moulage par injection Métaux Moteurs électriques Index. décimale : 668.4 Plastiques, vinyles Résumé : For compatibility with the electromobility and machine manufacturing mass markets, the sector is pushing for new concepts for the mass production of lightweight components for electrical single-axis drive trains. The use of fiber-reinforced, metal-filled polymers would considerably increase the efficiency of electric motors. This is the starting point for the ProLemo project, in which multiple partners are working together on production techniques for efficient lightweight motors for electrical vehicles. Note de contenu : - Highly filled soft magnetic composite - Two rotor variants on one mold - Weight saving of over nine kilograms - The overall weight of the ProLemo drive is reduced by over 9 kg thanks to th elightweight components. The rotor disks with different internal contours were both manufactured on an Arburg machine by a two-component process - Fig. 1. A modular rasterization was chosen for the structure of the rotor - Fig. 2. Variants for torque connection : the interior contour is produced as a multi-tooth and as a six-sided version - Fig. 3. The different steps of the creation process : the pre-molded part for torque connection, the component overmolded with SMC, and the rotor disk with inserted magnets En ligne : https://drive.google.com/file/d/1cd_LJGgBYiGWoS-l-7OoCcGqIFKvS9Yz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30085 [article]

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Customized foam / Mike Tromm in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 26-28 Titre : Customized foam : Process variant of foam injection molding opens up new lightweight construction potential Type de document : texte imprimé Auteurs : Mike Tromm, Auteur ; Hans-Peter Heim, Auteur Année de publication : 2018 Article en page(s) : p. 26-28 Langues : Anglais (eng) Catégories : Matériaux -- Allègement Mousses plastiques -- Moulage par injection Procédés de fabrication Index. décimale : 668.4 Plastiques, vinyles Résumé : With special mold technology and process control, it is possible to produce parts with locally highly foamed structures. The foam can considerably extend the limited design freedom of compact molded and conventionally foamed parts. Hence, extremely abrupt changes in wall thickness can be achieved and conventional design guidelines for ribs circumvented. Variothermal process control ensures excellent surfaces here. Note de contenu : - Lightweight construction potential is not yet exhausted - Precision opening restricted to specific mold areas - Hydraulic cylinder changes cavity volume inside the closed mold - Abrupt changes in wall thickness and surfaces as required - FIGURES : 1. Comparison of processes : the conventional foam injection molding in contrast to the high-pressure foam injection molding in combination with precision mold-opening - 2. Principles behind the pull an foam process : after volumetric mold filling, a section of the cavity is enlarged. The pressure drop initiated this way allows the blowing agent to expand locally to a greater extent - 3. The special features of the new experimental mold are the locally variable cavity volume and a variothermal insert - 4. Schematic diagram, locally expanded part and cross-sectional cut through an expanded rib area : the widest rib, at 10 mm, has been expanded five-fold here - 5. Variothermal temperature cycle with brief heating by 100K (from 90°C to 190°C) and subsequent cooling to th estandard mold temperature with the corresponding thermographic images of the mold. The positive influence on the surface quality is clear to see - 6. Cell size as a function of the process parameters : the results of the test plan show that, within the process window selected, the cell size and density can be influenced by a factor of 10 En ligne : https://drive.google.com/file/d/1hnY4cFcH4KKxS58jy0iUc-KiDr1ZOIb1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30086 [article]

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Fast compression in multiple layers / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 29-32 Titre : Fast compression in multiple layers : The Institute of Plastics Processing (IKV) investigates the injection compression molding of thick-walled lenses in a multilayered structure Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Malte Röbig, Auteur Année de publication : 2018 Article en page(s) : p. 29-32 Langues : Anglais (eng) Catégories : Lentilles (optique) Moulage par injection-compression Structures multicouches Temps de cycle (production) -- Réduction Index. décimale : 668.4 Plastiques, vinyles Résumé : Thick-walled plastic optics are usually built up layer by layer in multilayer injection molding, as this significantly shortens the cycle time. In order to improve the quality and further reduce the cycle time, layer thickness ratios were varied at the German research institute and strategies for mold temperature control were developed. In addition, injection compression molding was adjusted to the multilayer process. Note de contenu : - Lower cooling times, higher molding accuracy - Mold technology for the production of multilayer lenses - Multilayer injection molding and injection compression molding process in comparison - Optical quality in multilayer injection compression molding - Fig. 1. The mold technology enables the production of multilayered lenses in injection molding or injection compression molding. The first process steps on both variants are equal - Fig. 2. As the pre-molded part has no optical surface, it can be produced with a lower mold temperature - Fig. 3. The Strehl ration depending on the layer thickness ratio and the tool tempering at the test points with the best optical properties. After process optimization, better optical properties are achieved in injection molding than in injection compression molding - Fig. 4. Similar replication accuracies are achieved by injection molding and injection compression molding of multilayered lenses - Fig. 5. Small changes in the compression parameters already have a major influence on the geometry and optical properties En ligne : https://drive.google.com/file/d/19uUBTQU9OBaJKz8P5XRK8Fp9CqT7dos5/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30087 [article]

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Faster than the heat can flow / Karlhorst klotz in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 33-35 Titre : Faster than the heat can flow : High processing quality makes the USP laser attractive for industry Type de document : texte imprimé Auteurs : Karlhorst klotz, Editeur scientifique Année de publication : 2018 Article en page(s) : p. 33-35 Langues : Anglais (eng) Catégories : Impulsions laser ultra-brèves Matières plastiques Perçage et alésage Usinage par laser Index. décimale : 668.4 Plastiques, vinyles Résumé : The use of extremely short laser pulses is increasingly important for industrial material processing, especially in the case of delicate structures and thermally sensitive materials. Ultrashort pulse lasers have technical characteristics that offer new opportunities for precision and processing quality. Note de contenu : - Results of different pulse durations - Microexplosion instead of melting - Material machining in industry - Attoseconds on the horizon - Fig. 1. Biopolymer stent : left, the structure of the vascular wall support, produced from bioresorbable polymer with a femtosecond laser and in in detail view, fixation for the X-ray marker - Fig. 2. Bore in the edge region of a contact lens : bores manufactured with a USP laser serve to improve the oxygen supply to the cornea En ligne : https://drive.google.com/file/d/1MwdzrqYFFt7nZRVMR3Io4pK8ifJUUMoH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30088 [article]

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Keeping track of elongation / Sven Wolf in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 36-40 Titre : Keeping track of elongation : Online rheometers simplify the continuous evaluation of melt quality Type de document : texte imprimé Auteurs : Sven Wolf, Auteur ; Hans-Jürgen Luger, Auteur ; Jürgen Miethlinger, Auteur Année de publication : 2018 Article en page(s) : p. 36-40 Langues : Anglais (eng) Catégories : Composites à fibres Matières plastiques -- Extrusion Polyéthylène basse densité Polypropylène Rhéologie Rhéomètres Viscosité Index. décimale : 668.4 Plastiques, vinyles Résumé : In order to ensure efficient and cost-effective control of extrusion, the decisive parameters for melt quality must be determined during the process. Previously, only single points of the viscosity curve could be determined online. Now, with the help of special slit die geometry, a novel extrusion rheometer is able to measure shear and elongational viscosity – also inline. Note de contenu : - Patented hyperbolic elongation slit die - Comparison with offline measurements - Polymer preparation - Polymer blend development - Higher "resolution" with fiber compounds - Application possibilities for the extrusion rheometer - Conclusion another step towards industry 4.0 - Fig. Shear and elongation rheometer for online measurement : In the basic version, measurements are made with an (adjustable) fixed pump speed. The research versio can record complete elongational and shear viscosity curves automatically - Fig. 1. Semi-hyperbolic slit die. Basic plan and side views of the pattented slit, and a detail of the height and width curves in the first and second transition zones - Fig. 2. Basic measurement setup (without melt pump) in the extrusion rheometer. Melt flow for the inline measurement (with return) - Fig. 3. Elongational and shear viscosity of LDPE-1840 H and PP-RA 130E as determined with online and offline measurement methods - Fig. 4. Changes in the elongational and shear viscosity curves due to molecular degradation of PP-RA 130E after multiple processing - Fig. 5. Shear and elongational viscosity curves of different polypropylene blends during the development of plastic recipes - Fig. 6. Online measurement of polypropylene compounds with different amounts of glass fibers and natural fibers : Shear viscosity and elongational viscosity - Fig. 7. Film production line with twin-screw and integral viscosity sensor : Example of an integrated plant layout that already exists En ligne : https://drive.google.com/file/d/1Dj5sFYBrA_hl3unbqVN4p4pr9t3u8iql/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30092 [article]

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A cool mix / Rolf Heusser in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 41-42 Titre : A cool mix : Combining intensive static mixing with effective heat exchange Type de document : texte imprimé Auteurs : Rolf Heusser, Auteur Année de publication : 2018 Article en page(s) : p. 41-42 Langues : Anglais (eng) Catégories : Alliages polymères Films plastiques Malaxeurs et mélangeurs Matières plastiques -- Extrusion Mousses plastiques Systèmes de refroidissement Index. décimale : 668.4 Plastiques, vinyles Résumé : Static mixers are compact, but they cannot lower the melt temperature. Combining a static mixer with a powerful cooler in a single unit opens up new possibilities in process engineering. Note de contenu : - Operating principle behind the cooling mixer - Fields of application : Processes that require precise temperature control and a highly homogeneous melt - Cooling of residence-time-critical melts - Cooling of melts close to the solidification point - Plug-flow reactions - Fig. 1. Compact mixing : Promix static mixer SMB plus - Fig. 2. Cooling mixer : The cooling fluid is fed along short paths through the hollow channels, which simultaenously provide mechanical mixing - Fig. 3. No freezing. The cooling of PET melt near the solidification point proceeds smoothly at different melt throughputs and oil temperatures - Fig. 4. Higher extrusion throughput : Production of PET/PS packaging film - Fig. 5. Even lighter lightweight foam : A P1 cooling mixer integrated into the production of PS lightweight foam film improves cell structure and lowers the density En ligne : https://drive.google.com/file/d/10Xk_OZ0bVW7ESvDsCInSy9oN5eU80WmJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30093 [article]

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Combining natural fibers and plastics / Thomas Schwachulla in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 43-46 Titre : Combining natural fibers and plastics : Multifunctional natural fiber-plastic composites Type de document : texte imprimé Auteurs : Thomas Schwachulla, Auteur Année de publication : 2018 Article en page(s) : p. 43-46 Langues : Anglais (eng) Catégories : Composites à fibres végétales Matériaux -- Allègement Technique de la production Index. décimale : 668.4 Plastiques, vinyles Résumé : A plant that is unique in Germany, with the character of a pilot plant, at Rosenheim University of Applied Sciences combines the advantages of wood or natural fibers with those of plastics. The goal is to develop technically innovative products of natural fiber-plastic composites for auto engineering, wood and furniture construction and other applications, as well as the appropriate resource-friendly manufacturing processes. Note de contenu : - Wood and natural fiber composites have a future - The Munacu research cooperation - Holistic plant configuration - Fiber manufacture in the refiner plant - Material compounding and processing in one thermal process - Material feed and dosing - Inserting into the vertical clamping unit - Planned research focuses - Fig. 1. Biocomposite applications : NFRP and WPC production, with a total volume of 352,000 t, makes up 15% of the European composite material production (incl. glass fiber and carbon fiber composites ) of 2,4 million t - Fig. 3. Fiber manufacture in the refiner plant : here, natural fibers, of up to 50 mm length are obtained from renewable raw materials ; the picture shows the "steam bath" and the grinder - Fig. 4. Direct processing in one thermal step : in direct compounding extruder feeds directly into the standard plastication unit installed below it - Fig. 5. Differential weighing principle : Withe the loss-in-weight technique, the entire dosig system, including the reserve tank and its contents, as well as the dosing element, is weighed - Fig. 6. Continuous and synchronous material discharge. From the circular collection tank, the homogeneous mixture that has been produced passes directly into the material feed of the compounding extruder En ligne : https://drive.google.com/file/d/1Q4PWihwdZjPjdvcnH0W4VHyBXt0bM_xp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30094 [article]

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Monomers coursing through the veins / Roland Klein in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 47-49 Titre : Monomers coursing through the veins : Lowering the moisture absorption of natural fibers by cavity polymerization Type de document : texte imprimé Auteurs : Roland Klein, Auteur ; Marie-Isabel Popzyk, Auteur ; Konrad Burlon, Auteur ; Katharina Wennemann, Auteur ; Janis Karl, Auteur ; Thomas Köhler, Auteur ; Marko Wischnowski, Auteur ; Thomas Gries, Auteur Année de publication : 2018 Article en page(s) : p. 47-49 Langues : Anglais (eng) Catégories : Composites à fibres végétales Fibres végétales -- Propriétés mécaniques Humidité -- Absorption Lin et constituants Le lin cultivé (Linum usitatissimum) est une plante annuelle de la famille des Linaceae cultivée principalement pour ses fibres, mais aussi pour ses graines oléagineuses. Les fibres du lin permettent de faire des cordes, du tissu (lin textile pour ses qualités anallergiques, isolantes et thermorégulateurs), ou plus récemment des charges isolantes pour des matériaux de construction. Les graines sont utilisées pour produire de l'huile de lin pour l'industrie de l'encre et de la peinture, pour la consommation humaine et animale, à cause de sa richesse en oméga 3. Le lin est une des rares fibres textiles végétales européennes. Elle a comme caractéristiques la légereté, la rigidité et la résistance et comme particularité d'être une fibre longue (plusieurs dizaines de centimètres), par rapport aux fibres courtes (coton, chanvre) ou moyennes (laine). Monomères Polymérisation Index. décimale : 668.4 Plastiques, vinyles Résumé : Natural fibers are light, economical and renewable. Which is why they are being increasingly considered for structural components. However, when moisture penetrates into the fibers, their mechanical properties suffer. Cavity polymerization can close the fiber cavities and prevent the natural fibers from absorbing as much water. Note de contenu : - Damp fibers due to cut edges or damage - Coupling agents only work on the fiber surface - Hydrophobic fibers due to monomers - Fig. 1. Problem, solution, result and process by the BMBF project "BastFix" at a glance - Fig. 2. Wrap yarn with parallel flax fibers in the core and a multifilament for wrapping - Fig. 3. Water absorption capacity of variously impregnated flax fibers. The moisture absorption was measured gravimetrically after conditioning of the fibers in water at room temperature (CoPo : copolymer BA : butyl acrylate ; MMA : methyl methacrylate, AIBN : asobis(isobutyronitrile) ; LA : lactic acid : Peroxan LP : dilauroyl peroxide En ligne : https://drive.google.com/file/d/1wAxYobRhVWeL3-TEkaeZPuH3VZRDSQmN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30095 [article]

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Naturally non-flammable / Hans-Peter Heim in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 51-54 Titre : Naturally non-flammable : PBT compounds modified with natural fiber reinforcement as flame retardant Type de document : texte imprimé Auteurs : Hans-Peter Heim, Auteur ; Maik Feldmann, Auteur ; Nicole Gemmeke, Auteur Année de publication : 2018 Article en page(s) : p. 51-54 Langues : Anglais (eng) Catégories : Composites à fibres -- Propriétés mécaniques Composites à fibres de verre Composites à fibres végétales Composites à fibres végétales -- Propriétés mécaniques Fibres cellulosiques Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Matières plastiques -- Additifs Polybutylène téréphtalate Index. décimale : 668.4 Plastiques, vinyles Résumé : Good fire resistance is important in technically demanding applications. However, the use of suitable additives reduces the mechanical properties of a material, e. g. impact resistance and tensile strength. It can now be shown that this effect can be counteracted by means of regenerated cellulose fibers. Note de contenu : - Fire retardancy strategies for fiber-reinforced PBT - Multiple fire retardancy for Vo classification achieved - Mechanical characterization of the compounds - Fig. Cable guides makes of flame retardant PBT with cellulose fiber reinforcement for the Katla luminaire. Mold trials at Alfret Pracht Lichttechnik GmbH, Dautphetal-Buchenau, Germany - Fig. 1. Photo of a test rod after UL 94 V classification and a schematic representation of fiber-reinforced PBT with flame retardant (AIPi + MPP). When subjected to heat, the MPP foams, thereby preventing flame formation - Fig. 2. The flame retardant additive Exolit 1230 exhibits larger particles than Budit 341, as shown in the scanning electron microscope image. The two component are mixed and then compounded into the polymer - Fig. 3. Fracture surface of flame retardant PBT with cellulose fiber reinforcement and glass fiber reinforcement under a scanning electron microscope - Fig. 4. Overview of the mechanical properties : Tensile modulus, notch impact resistance, tensile strength, and elongation at break of (filled) PBT and flame retardant (filled) PBT - Table : Following the first and second flame impingements (Σt1 + t2), the total glowing time of filled PBT is lower than for pure PBT with flame retardant additives En ligne : https://drive.google.com/file/d/1aGv5u7kUwMRbbnRRB3BSlP-SPclnrJ1e/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30096 [article]

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Reducing load in air transportation / Tobias Joppich in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 55-57 Titre : Reducing load in air transportation : Fiber-reinforced thermoplastic modules can be used to reinforce airplane cargo compartments Type de document : texte imprimé Auteurs : Tobias Joppich, Auteur ; Andreas Menrath, Auteur ; Verena Wippo, Auteur ; Timo Huber, Auteur Année de publication : 2018 Article en page(s) : p. 55-57 Langues : Anglais (eng) Catégories : Avions -- Matériaux Composites à fibres -- Moulage par injection Polyéther imide Soudage laser Stratifiés Index. décimale : 668.4 Plastiques, vinyles Résumé : The use of thermoplastic fiber composites enables outstanding specific stiffness and flame retardant properties to be combined with reaction-free and integrative joining technologies. This has been demonstrated by using an economical, industrial-scale process to manufacture a hybrid reinforcing component, which can be applied for example in the cargo compartments of airplanes. Note de contenu : - Flexibility through connected modules - Advantages of the two-step hybrid molding process - Forming with handling system - Adhesive joining via injection molding - Fig. 1. Reinforcing grid assembled from four substructures - Fig. 2. The grid structures and the face sheet were joined using transmission laser welding at the Laser Zentrum Hannover - Fig. 3. The gripper-assisted forming process prevents the composite laminate from touching the forming dies too early - Fig. 4. Manufacturing of the substructure in the injection molding process - Fig. 5. The results of a statistical model for the peeling of a hybrid composite consisting of PEI composite laminate and PEI injection molding compound show the joining strength as a function of the process parameters En ligne : https://drive.google.com/file/d/1BYKGGhdLfUsRVheaHrLgySaejX4jbbeU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30104 [article]

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