Flow field dynamics in pultrusion injection boxes / Christian Hopmann in JEC COMPOSITES MAGAZINE, N° 141 (07-08/2021)

[article]  inJEC COMPOSITES MAGAZINE > N° 141 (07-08/2021) . - p. 22-25 Titre : Flow field dynamics in pultrusion injection boxes Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Lorenz Wruck, Auteur ; Daniel Schneider, Auteur ; Kai Fischer, Auteur Année de publication : 2021 Article en page(s) : p. 22-25 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Boites d'injection Composites à fibres Essais (technologie) Fluides, Mécanique des Matériaux -- Imprégnation Pultrusion par injection Index. décimale : 668.4 Plastiques, vinyles Résumé : Injection boxes offer various benefits in pultrusion regarding the reaction speed of resins as well as reduction of volatile emissions for traditional materials. To leverage these benefits, IKV is investigating the flow field dynamics practically in a distinctively developed transparent injection box. Note de contenu : - Opportunities and challenges in pultrusion - Injection boxes provide major benefits - Parameters to consider for injection pultrusion - Pressure build-up and impregnation - Transparent die for efficient testing - Limitations of impregnation - Fig. 1 : Collection of main features of the transparent injection box setup (A:A in reference to fig. 3) - Fig. 2 : Identification of the relevant mechanisms, pressure build-up and impregnation, within the backflow of the injection box - Fig. 3 : Dimensions of the developed modular, transparent injection box (dimensions in mm) - Fig. 4 : Comparison of haul-off forces under variation of haul-off speed and fluid for different fibre volume contents - Fig. 5 : Comparison of haul-off forces under variation of haul-off speeds and horizontal opening angles for different fibre volume contents Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37181 [article]

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Polyurethane world becoming more sustainable / Florian Kessler in KUNSTSTOFFE INTERNATIONAL, Vol. 106, N° 12 (12/2016)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 106, N° 12 (12/2016) . - p. 22-23 Titre : Polyurethane world becoming more sustainable : Ecological as well as economical requirements as targets Type de document : texte imprimé Auteurs : Florian Kessler, Auteur ; Daniel Schneider, Auteur Année de publication : 2016 Article en page(s) : p. 22-23 Langues : Anglais (eng) Catégories : Composites -- Recyclage Polyuréthanes Salons professionnels Index. décimale : 668.4 Plastiques, vinyles Résumé : That polyurethane can make a valuable contribution to the current trends of resource efficiency, lightweight design, sustainability and recycling that are prevalent in every industrial sector is demonstrated by the PU industry in the form of new solutions for increasingly demanding economical and ecological challenges. In this way, PU as a reactive material is confirming its great potential to be a long-term alternative to existing materials, and this not only because of its versatility. Note de contenu : - A trip through the mixing head - Sustainable composites - Figures : 1. Demolding of a continuous fiber-reinforced part, manufactured using Cavus technology - 2. The combination of new and recycled carbon fibers shows the versatility of Cresim technology En ligne : https://drive.google.com/file/d/1Vkfqd4W5K09N1yHg66OGudnR6YXGdrlG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27393 [article]

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Polyurethanes moving with the times / Florian Kessler in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 10 (10/2018)

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 10 (10/2018) . - p. 36-40 Titre : Polyurethanes moving with the times : Specialization, resource efficiency, and digitalization are driving developments Type de document : texte imprimé Auteurs : Florian Kessler, Auteur ; Daniel Schneider, Auteur Année de publication : 2018 Article en page(s) : p. 36-40 Langues : Anglais (eng) Catégories : Matériaux -- Allègement Matières plastiques -- Moulage par injection Moussage (chimie) Mousses plastiques Polymères -- Applications industrielles Polyuréthanes Système de changement de couleur Index. décimale : 668.4 Plastiques, vinyles Résumé : This versatile material is continually opening up new areas of application. A processing technology that achieves high component quality and cost efficiency is the requirement for PU products to be manufactured competitively. Rapid digitalization is playing an increasingly important role here. Note de contenu : - Rapid color changes - Sealed tight - Saving resources - Lightweight structural components with PU - Polyurethane 4.0 - Thanks to their versatility, polyurethane applications are advancing on all fronts: here is a current example of a polyurethane foam seal made from Fermapor CC with very low moisture absorption and good resistance to ice water, which is a favorably priced alternative to previous closed-cell systems or silicone foams, according to the manufacturer - Fig. 1 : Colourline multi-connect : this modular machine system can reduce color changing to less than 15 min - Fig. 2 : Rapid color changing: with the MK10/15-UVP-2K+4 transfer mixing head, up to four colors can be metered without colorant carryover - Fig. 3 : Carabiner closure: this tool technology for cable foam encapsulation seals off insulat¬ed cable strands so that no foam can escape from the tool - Fig. 4 : iPul line for the production of fiber-reinforced polyurethane profiles: in this complete line, fiber impregnation takes place in a closed injection box, which reduces pollution of the work environment and allows higher production speeds - Fig. 5 : UltraSim: with foaming simulation, it is possible not only to describe the processing of steer¬ing wheels but also to determine their mechanical behavior Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31444 [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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