More precision for sensitive fast curing compounds / Cordula Wieland in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 12 (12/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 12 (12/2018) . - p. 20-23 Titre : More precision for sensitive fast curing compounds : APC plus from kraussMaffei now available for thermosets Type de document : texte imprimé Auteurs : Cordula Wieland, Auteur ; Topic, Nicolina, Auteur ; Jan Hirz, Auteur Année de publication : 2018 Article en page(s) : p. 20-23 Langues : Anglais (eng) Catégories : Charges (matériaux) Composites à fibres de verre Contrôle de processus adaptatif Matières plastiques -- Moulage par injection Thermodurcissables Index. décimale : 668.4 Plastiques, vinyles Résumé : They offer high stiffness, are heat and chemically resistant and flow freely into the machine: we are not talking about high-performance thermoplastic resins such as PEEK or PPS, but thermoset polymers. For processing these challenging materials, the large series specialist Baumgarten automotive technics employs the APC plus machine function from KraussMaffei. As a result, rejects have fallen significantly. Note de contenu : - Less fluctuation in the cavity pressure signal - Same OFT value - But different material behavior - The volumetric filling of the cavity remains constant - Parts with higher shot weights - trend and challenge - Large-series application - Fig. : Key to the vacuum pump cover is the absolutely flat functional surface. The challenge here is that the pronounced rib structure on the reverse side must not show through on the flat side. This can be solved by using PF thermoset compounds - Fig. 1 : Precision parts with only 10 pm tolerance : the oil pump adjusting ring of PF (MD+GF) 70. Production has been running since 2014 in continuous three-shift operation on a CX200 - Fig. 2 : A 48-hour test (24 h without and 24h with APC plus) shows that the machine function significantly reduces the fluctuation band of the cavity pressure (NT = non-thermoplastics) - Fig. 3 : The more highly filled, the lower is the material-specific compression curve. At 1000 bar pressure, the mass column of an organically filled PF is compressed by 3.7% ; at 80 % filling of glass fibers and mineral components, it is only 1,8% - Fig. 4 : If the cylinder temperature rises by 2°C, and the mass becomes less viscous, APC plus switches to holding pressure at an earlier point and reduces the pressure level to prevent over-filling of the part En ligne : https://drive.google.com/file/d/1QV1ov7Dn0AiQiI8JccYmAFGf_hIWyil4/view?usp=drive [...] Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31414 [article]

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Sprue recycling conserves resources / Robert Maertens in KUNSTSTOFFE INTERNATIONAL, Vol. 113, N° 1 (2023)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 113, N° 1 (2023) . - p. 48-51 Titre : Sprue recycling conserves resources : Direct recycling of cured thermosets as fillers in the injection molding process Type de document : texte imprimé Auteurs : Robert Maertens, Auteur ; Michael Dieterle, Auteur ; Tayla Herrmann, Auteur ; Jan Hirz, Auteur ; Dietmar Klaas, Auteur Année de publication : 2023 Article en page(s) : p. 48-51 Langues : Anglais (eng) Catégories : Durée de vie (Ingénierie) Fragmentation Granulation Matières plastiques -- Moulage par injection Matières plastiques -- Recyclage Mélange Thermodurcissables Thermodurcissables -- Propriétés mécaniques Thermodurcissables -- Recyclage Index. décimale : 668.4 Plastiques, vinyles Résumé : Thermoset molding compounds crosslink irreversibly during processing. Both the material from the sprue runner system, the process start-up and scrap components are typically sent for thermal recycling as waste. The granulation and direct recycling of this material in the injection molding process increases resource efficiency due to material recycling, but has an influence on the mechanical properties of the components. In the present study, the necessary parameters are investigated. Note de contenu : - Preparation and Injection Molding of the Recyclate - Impact assessment based on global warming potential - Mechanical properties of the component - Challenges in the injection molding process - Positive contribution to recycling - Figure : Recycling of sprue loss through shredding, blending with virgin material and direct recycling - Table 1 : Results of the LCA study according to the GWP 100 global warming potential En ligne : https://drive.google.com/file/d/1CctNC7sw1Vse-ZSZH60RebntY6kOdwgb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39220 [article]

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