Multi-layer counter-pressure injection molding for thick-walled optical lens / Y. Liu in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 2 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 2 (2021) . - p. 131-136 Titre : Multi-layer counter-pressure injection molding for thick-walled optical lens Type de document : texte imprimé Auteurs : Y. Liu, Auteur ; L. Cao, Auteur ; W.-K. Chi, Auteur ; L.-Y. Zhang, Auteur ; W.-M. Yang, Auteur ; P. C. Xie, Auteur Année de publication : 2021 Article en page(s) : p. 131-136 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Conception technique Lentilles (optique) Moulage par injection à contre-pression multicouche Moules d'injection Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Index. décimale : 668.4 Plastiques, vinyles Résumé : In precision optical applications, plastics thick-walled optical lenses are increasing. Dimensional stability and optical performance are the critical issues that should be addressed for plastic thick-walled lenses. A novel multi-layer counter-pressure injection molding process is proposed in this study. The experimental prism mold with moveable pistons was developed to investigate the effects of layering methods, counter-pressure and their combination on thick-walled optical lenses. The experimental results reveal that counter-pressure injection molding is effective in improving shrinkage, transmittance and refractive index of the thick-walled optical prism. Counter-pressure of the piston provided lower melt velocity and shorter flow path of melt to improve polymer molecules orientation, and also offered continuous holding pressure during the filling stage to eliminate defects such as shrinkage or short shots. The combination of counter-pressure and multi-layer injection molding technology further improved the dimension stability and optical performance of the thick-walled optical lens. Much thinner layers than the final wall thickness of prism ensures shrinkage reduction during the cooling stages. A thick-walled optical prism was fabricated successfully upon applying a multi-layer counter-pressure injection molding process. Note de contenu : - Introduction - Multi-Layer Counter-pressure injection molding process - Experimental : Mold design - Materials - Molding procedure - Measurement of dimensions and optical performance - Results and Discussion : Effect of counter-pressure on the quality of the thick-walled optical lens - Effect of multilayer counter-pressure on the quality of the thick-walled optical lens - Table 1 : Injection molding process parameters - Table 2 : Process parameters for general counter-pressure injection molding - Table 3 : Process parameters for multi-layer counter-pressure injection molding - Table 4 : Resulting edge height of the thick-walled optical prism under varying counter-pressures DOI : https://doi.org/10.1515/ipp-2020-3994 En ligne : https://drive.google.com/file/d/1cTbYiu9h-pWbs7fTCfJ0VlLT9vSgTo_-/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36356 [article]

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