Less granules stock means more quality / Georg Steinbichler in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 7 (2020)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 7 (2020) . - p. 15-18 Titre : Less granules stock means more quality : the principle of starve feeding : injection molding ultrahigh purity light guides Type de document : texte imprimé Auteurs : Georg Steinbichler, Auteur ; Erich Hochreiter, Auteur ; Jànos Birtha, Auteur ; Klaus Fellner, Auteur Année de publication : 2020 Article en page(s) : p. 15-18 Langues : Anglais (eng) Catégories : Automobiles -- Eclairage Diodes électroluminescentes Guide de lumière LED Matières plastiques -- Moulage par injection Matières plastiques dans les automobiles Index. décimale : 668.4 Plastiques, vinyles Résumé : In cars, LEDs are taking over ever more applications and are increasingly used as differentiating design ‧elements. They increase the geometrical variation, which poses new challenges to manufacturers of light guides. In order to ensure a high luminous efficiency even with complex geometries and elongated structures, Engel has developed a new plasticizing process for manufacturing light guides. This increases the homogeneity and purity of the melt, thus opening up new freedom for light designers. Note de contenu : - Starve-feeding reduces the shear load - Plant concept with inline quality testing - Correlated color temperature confirms the high light-guide quality - Finding optimum process parameters - Figure : The transformation of the automobile also strongly affects the vehicle interior. Light is gaining in importance as a design element - Fig. 1 : The aim of the development was to obtain a high optical quality in complex light guide shapes. The fine structures on the top of the demo parts serve for outcoupling of the light - Fig. 2 : Three optical waveguides with different lengths and different shapes were produced in a family mold - Fig. 3 : The key to a high luminous efficiency is starve feeding of the melt cylinder - Fig. 4 : Inline quality testing records the CCT value of the light guide both close up and at a distance from teh light - Fig. 5 : The starve feeding has a positive influence on the quality of the light guide. The best results are obtained when the melt cylinder is filled to 65 %. Flushing of the feed zone with nitrogen increases the melt purity. The smaller the change of the correlated color temperature CCT, the higher the quality of the light conductor - Fig. 6 : To optimize the process, further parameters were varied and correlated with the optical quality of the light guide. The biggest influence on the injection molding result is shown by the circumferential speed of the plasticizing screw, the injection speed of the melt, the mold temperature and the dust removal from the pellets En ligne : https://drive.google.com/file/d/14KxXMKFA5yhND-TKwq6RFmltC8Rdf0q7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34810 [article]

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