The influence of melt and process parameters on the quality and occurrence of part defects in water-assisted injection molded tubes / Sofie Sannen in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 5 (11/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 5 (11/2011) . - p. 551-559 Titre : The influence of melt and process parameters on the quality and occurrence of part defects in water-assisted injection molded tubes Type de document : texte imprimé Auteurs : Sofie Sannen, Auteur ; J. de Keyzer, Auteur ; Peter Van Puyvelde, Auteur Année de publication : 2011 Article en page(s) : p. 551-559 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Epaisseur -- Mesure Matières plastiques -- Moulage par injection Matières plastiques -- Moulage par injection assistée par eau Moulage par injection -- Défauts Plan d'expérience Polyéthylène haute densité Polypropylène Tubes Index. décimale : 668.4 Plastiques, vinyles Résumé : This study investigates the influence of melt and process parameters on the quality of water-assisted injection molded tubes. The influence was determined by the aid of a design of experiments (DOE) for both a HDPE and a PP resin. This design was carried out on two different cavities, in which the residual wall thickness (RWT) and the part weight were set as response functions. This was combined with a visual inspection of the part surface to detect correlations in the occurrence of part defects such as fingering and double wall. It was found that the water injection delay time and the water volume flow rate have the largest influence on the RWT and part weight. Moreover, the shear viscosity of the applied material determines the width and shape of the water bubble and consequently the RWT and part weight. In addition, process parameters such as melt temperature, water hold time and water volume flow rate as well as melt parameters such as shear viscosity have an influence on the formation of part defects. DOI : 10.3139/217.2490 En ligne : https://drive.google.com/file/d/1pAOyM1fM_bc-Cly4qKQsP7EtT8zUFo3j/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12471 [article]

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Water penetration behavior in water-assisted injection molding (WAIM) : A study of product quality for different process and material parameters / Sofie Sannen in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 5 (11/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 5 (11/2012) . - p. 602-616 Titre : Water penetration behavior in water-assisted injection molding (WAIM) : A study of product quality for different process and material parameters Type de document : texte imprimé Auteurs : Sofie Sannen, Auteur ; M. de Munck, Auteur ; Peter Van Puyvelde, Auteur ; J. de Keyzer, Auteur Année de publication : 2012 Article en page(s) : p. 602-616 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection Matières plastiques -- Moulage par injection assistée par eau Moulage par injection -- Défauts Polypropylène Tags : 'Moulage  injection  assisté  eau'  Polypropylène  'Comportement  pénétration  'Epaisseur  paroi  résiduelle'  'Formation  défaut  pièce'  'Mesure  pression  'Débit  volume'  Viscosité  'Fluidité  cisaillement' Index. décimale : 668.4 Plastiques, vinyles Résumé : This study investigates the relation between water penetration behavior and product quality in water-assisted injection molding (WAIM) for different process and material parameters. The principle mechanisms responsible for both building up the residual wall thickness (RWT) and formation of part defects as well as the influence of these process and material parameters on the RWT and occurrence of part defects could be revealed. This is done by relating the measurements of water pressure and water volume flow rate, visualizing in-mold variations during water injection, to both the part weight and a visual inspection of part cross-sections, for different process settings and materials. It was found that the RWT as well as the formation of part defects depend on the polymer resistance, since the variation of the latter leads to a change in both the water bubble width and velocity. On the one hand, the resistance is determined by the process parameters having an influence on the amount of melt ahead of the water bubble, depending on injector opening time, water volume flow rate and water injection delay time. On the other hand, the resistance also depends on the friction between the polymer chains, which is determined by the zero-shear viscosity and the shear thinning behavior of the polymer. In addition, the occurrence of part defects is directly related to the polymer crystallization behavior. The resulting product quality therefore depends on a combination of the process parameters and the applied material. Note de contenu : - EXPERIMENTAL : Material ans set-up - Methodology - RESULTS AND DISCUSSION : Injector opening time - Influence of material parameters DOI : 10.3139/217.2622 En ligne : https://drive.google.com/file/d/1QMi2LZqb5pZ-u5u4ggioD88OQUFJCeov/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16643 [article]

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