A new scheme for controlling part cooling in injection molding / J. M. Hernandez in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 3 (07/2007)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 3 (07/2007) . - p. 276-283 Titre : A new scheme for controlling part cooling in injection molding Type de document : texte imprimé Auteurs : J. M. Hernandez, Auteur ; B. Pramujati, Auteur ; R. Dubay, Auteur Année de publication : 2007 Article en page(s) : p. 276-283 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Part cooling parameters such as coolant flow rate and coolant temperature has been shown to have an important influence on the part quality in plastic injection molding. Molders commonly manipulate the coolant flow rate in an unclear manner to adjust part quality and reduce the overall cycle time. Manipulating such parameters effectively can indirectly control part quality when deviations in the injection processing variables occur if it is done in a controlled manner. In this investigation, coolant flow rate is selected to be the manipulated variable that affects an average temperature of the part surface as it cools within the mold cavity. The average part temperature is the controlled variable and its control represents the indirect control of part quality. Experiments were conducted to quantify the effects of coolant flow rate on the part surface temperature demonstrating that it is highly nonlinear and its control would require an advanced control scheme. An adaptive online modeling algorithm that uses information from temperature and flow rate sensors was developed to continuously retune a predictive controller for controlling the part surface temperature. Good control performance was obtained from the adaptive strategy for tracking setpoint changes in the part temperature and when the cooling cycle was reduced from 16 to 14s. DOI : 10.3139/217.1013 En ligne : https://drive.google.com/file/d/1ge4PtryQuidxefYAAF69mgZUenz9xgPb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2705 [article]

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Utilizing processing parameters for evaluating polymer viscosity during plastication in injection molding / R. Dubay in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 3 (07/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 3 (07/2009) . - p. 298-305 Titre : Utilizing processing parameters for evaluating polymer viscosity during plastication in injection molding Type de document : texte imprimé Auteurs : R. Dubay, Auteur ; D. Zhang, Auteur ; J. M. Hernandez Année de publication : 2009 Article en page(s) : p. 298-305 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : This paper investigates the viscosity behavior of melt polymer during the plastication stage in an injection molding machine (IMM). The objective of this paper is to develop theoretical viscosity-based models for evaluating and predicting the bulk viscosity of the melt polymer near the tip of the screw during the plastication stage. The uniqueness of these models is that they include the effects of material properties and machine processing parameters, such as screw rotational speed, hydraulic back pressure, barrel pressure drop, melt pressure and melt temperature. Several open loop tests were conducted on an industrial IMM in order to quantify process parameter effects on the plastication cycle. The derived model was used to predict bulk viscosity using the open loop tests data. The viscosity-based models in this work will be used for developing future optimal controllers for controlling the polymer viscosity during the plastication stage of the injection molding cycle. DOI : 10.3139/217.2267 En ligne : https://drive.google.com/file/d/12n9VM85YSfo78XqZgv6i5U4pLwAVf127/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5934 [article]

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