CO2 foaming made easy / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 8 (08/2018)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 8 (08/2018) . - p. 14-18 Titre : CO2 foaming made easy : Tailor-made blowing agent mixtures in foam sheet extrusion Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Robert Breuer, Auteur ; Philipp Gladbach Année de publication : 2018 Article en page(s) : p. 14-18 Langues : Anglais (eng) Catégories : Agents d'expansion (chimie) Dioxyde de carbone Malaxeurs et mélangeurs Mélanges (chimie) Mousses plastiques -- Extrusion Rhéologie Solubilité Viscosité Index. décimale : 668.4 Plastiques, vinyles Résumé : In industrial practice, CO2 has so far only partially established itself as a blowing agent in foam sheet production because it is poorly soluble in plastics and therefore requires high process pressures. However, co-blowing agents can increase the solubility of carbon dioxide, so that lower pressures and lower temperatures are sufficient for processing. Note de contenu : - IKV foam extrusion pilot line : two injection ports for CO2 (front) and co-blowing agents (back) are used for foaming with blowing agent mixtures - Fig. 1 : Inline rheometer die with inspection window, bypass outlet, pressure transducers and adjustable die gap. Sketched are also emerging gas bubbles - Fig. 2 : IKV foam extrusion line : long single-screw extruder with direct injection of blowing agent, static mixer and annular sheet die - Fig. 3 : Solubility of the blowing agent mixture as a function of the co-blowing agent concentration : solubility increases with increasing proportion of the more soluble co-blowing agent - Fig. 4 : Foaming pressure as a function of the blowing agent concentration : blowing agent mixtures allow lower foaming pressure to be used - Fig. 5 : Viscosity of the gas-loaded melt as a function of the co-blowing agent quantity : the viscosity decreases with increasing blowing agent content and increasing molar co-blowing agent quantity in the polymer melt - Fig. 6 : Nucleation density for a blowing agent mixture of 2.5 wt. % CO2 and 0.5 wt. % ethanol as a function of the reduced die pressure p*: with increasing nucleation density the structure is more fine-celled En ligne : https://drive.google.com/file/d/11R1HM-4MATBowlULjA2FUGOpqnnhiwNH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31082 [article]

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