Foam injection molding for thin-walled packaging / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 10 (10/2019)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 10 (10/2019) . - p. 102-106 Titre : Foam injection molding for thin-walled packaging : Viscosity reduction for molded parts with large flow path/wall thickness ratios foam injection molding for thin-walled packaging Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Yuxiao Zhang, Auteur ; Katrin Theissen, Auteur Année de publication : 2019 Article en page(s) : p. 102-106 Langues : Anglais (eng) Catégories : Emballages en matières plastiques Mousses plastiques -- Moulage par injection Polypropylène Rhéologie Viscosité Index. décimale : 668.4 Plastiques, vinyles Résumé : As physical foam injection molding reduces the melt viscosity, it can be used for the production of thin-walled components. The material savings are not achieved by foaming the polymer, but rather by realizing lower wall thicknesses. The influence of the gas loading process on viscosity reduction and component quality is investigated using selected polypropylene types and an exemplary container geometry. Note de contenu : - Reduced viscosity due to blowing agent loading - Influence of blowing agent loading on component quality - Qualification of foam injection molding for packaging applications - Figure : Foamed and compact box components reveal the potential of foam injection molding for applications with reduced wall thickness - Fig. 1 : The online rheometer makes it possible to determine the viscosity of melts loaded with blowing agent. For this purpose, the pressure difference between the sensor positions is measured - Fig. 2 : With known geometry and a given volume flow, the measurement of the pressure difference between the sensor positions allows the representative viscosity to be calculated - Fig. 3 : Representative viscosity measured at three melt temperatures for polypropylene type FPC45 as a basis for determining the feasible viscosity reduction - Table 1 : These polypropylene types were processed in the MuCell process trials En ligne : https://drive.google.com/file/d/188-NizKwTliwZPiEBvvRdqiVgXS5A0By/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33801 [article]

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