Excellent resistance at reduced weight / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 11 (11/2019)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 11 (11/2019) . - p. 28-31 Titre : Excellent resistance at reduced weight : The qualification of suitable foam injection molding processes enables the use of thermosets in lightweight construction applications Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Maximilian kramer, Auteur ; Stefan Haase, Auteur Année de publication : 2019 Article en page(s) : p. 28-31 Langues : Anglais (eng) Catégories : Agents d'expansion (chimie) Matériaux -- Allègement Matières plastiques -- Moulage par injection Matières plastiques -- Propriétés mécaniques Sphères creuses Index. décimale : 668.4 Plastiques, vinyles Résumé : The transfer of foam injection molding from thermoplastic to thermoset processing has not yet been implemented in industrial practice. IKV Aachen has investigated this transfer and has precisely analyzed the economic efficiency of the process and the potential for lightweight construction. Note de contenu : - Which foaming processes are suitable ? - Hollow glass spheres as an alternative - Studies with chemical blowing agents - Pros and cons of hollow glass spheres - Cost comparison facilitates process selection - Figure : Foamed thermosets can be used to produce low-density thermally resistant components at low cost - Fig. 1 : The expansion of the chemical blowing agent in thermoset foam injection molding is similar to thermoplastic foam injection molding in the mold, but the reaction is thermally initiated - Fig. 2 : The specimen geometry allows the analysis of different material properties - Fig. 3 : Influence of the process parameters : with an increasing blowing agent content the component weight is reduced. The results of the mechanical analysis are shown on the right - Fig. 4 : In addition to an increasing content of hollow glass spheres (HGS,) decreasing melt temperatures and injection speeds leat to lower component weights. The stiffness and impact strength can even be improved - Fig. 5 : The cost comparison calculation shows that the use of chemical blowing agent results in an economic advantage for large quantities. Hollow glass spheres, on the other hand, improve the mechanical properties En ligne : https://drive.google.com/file/d/1i85hS5I34K35GwyaKLUowwPd8M4Mf9o0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33654 [article]

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Faultless conductor tracks with a long service life / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 107, N° 3 (03/2017)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 107, N° 3 (03/2017) . - p. 10-14 Titre : Faultless conductor tracks with a long service life : Integrated metal/plastics injection molding enables the economical production of plastic components with directly injected long-term-resistant conductor tracks Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Philipp Ochotta, Auteur ; Stefan Haase, Auteur Année de publication : 2017 Article en page(s) : p. 10-14 Langues : Anglais (eng) Catégories : Alliages Circuits électriques Composites à fibres de verre Matières plastiques -- Moulage par injection multicomposant Polyamide 6 Polybutylène téréphtalate Polyéthylène téréphtalate Index. décimale : 668.4 Plastiques, vinyles Résumé : Plastic/metal hybrids - The IKV in Aachen, Germany, has investigated the influence of process management on the quality and durability of electrically conductive plastic components. In the process, the conductor tracks were molded into the plastic carrier by die casting in an integrated process. The results show that the components produced in this way have a long service life with regard to electrical loads. Compared to overmolding of inserts, the process can be an economical alternative. Note de contenu : - Plastic carrier with integrated metallic conductor track - Venting is critical - Electrically highly resistant and suitable for continuous use - Is the change worthwhile ? - The complexer, the more economic - FIGURES : 1. Similar to multi-component injection molding with transfer technology, plastic parts with integrated conductor tracks are manufactured with IMKS - 2. Modular mold technology for the production of carrier plates with different conductor track geometries - 3. Influence of the die-casting settings on the relative number of defects : With low clamping force and injection speed, defects (see the air pockets at the bottom right) can be avoided - 4. Comparison of the temperatures at different currents : Small tracks can also transmit large currents - 5. Comparison of the measured voltage over 1000 load cycles :Even after 1000 cycles there is no voltage drop - 6. Static cost comparison method : For complex three-dimensional track shapes, manufacturing with the IMKS is economical - TABLE : Resulting component costs in Euro with a quantity of 100 000 En ligne : https://drive.google.com/file/d/1h6qikbQZOHmI7NymB_RsPLU-VFtXW9Hz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28264 [article]

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