Maintaining stable pressure limits / Hannes Bernhard in KUNSTSTOFFE INTERNATIONAL, Vol. 105, N° 1-2 (01-02/2015)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 105, N° 1-2 (01-02/2015) . - p. 43-45 Titre : Maintaining stable pressure limits : Maximum protection with no loss of dynamics - a pressure limit closed loop controller by Engel Austria does that during injection Type de document : texte imprimé Auteurs : Hannes Bernhard, Auteur ; Alfred Ellinger, Auteur ; Hannes Fritz, Auteur ; Gerhard Dimmler, Auteur Année de publication : 2015 Article en page(s) : p. 43-45 Langues : Anglais (eng) Catégories : Emballages en matières plastiques Matières plastiques -- Moulage par injection Pression -- Contrôle Index. décimale : 668.4 Plastiques, vinyles Résumé : Injection pressure increases constantly while plastic melt is being injected into a mold. In order to maintain a specified injection pressure limit, melt flow has to be slowed down before reaching its limit value. A pressure limit closed loop controller determines the latest possible point for intervening in the injection process, in order to obtain the shortest injection time that is still compatible with maximum mold protection. Note de contenu : - Thin-wall production without process stability - Not early, but timely intervention - Feedback controller keeps pressure reliability under control En ligne : https://drive.google.com/file/d/12sgotvthegOmf8rGaS3EbFH9UuG_Orbj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23296 [article]

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More stability increases attractiveness / Reinhard Schiffers in KUNSTSTOFFE INTERNATIONAL, Vol. 107, N° 8 (08/2017)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 107, N° 8 (08/2017) . - p. 26-29 Titre : More stability increases attractiveness : Optimized process control for injection molding of thermoset molding compounds Type de document : texte imprimé Auteurs : Reinhard Schiffers, Auteur ; Topic, Nicolina, Auteur Année de publication : 2017 Article en page(s) : p. 26-29 Note générale : - Disturbances in injection molding - Process stabilization through adaptive closed-loop control systeme - Thermoset processing perspectives - FIGURES : 1. melt pressure and mold cavity pressure curves during the injection and holding pressure phases of two BMC UP (GF+MD) material types with various viscosity: with the same process settings, various pressure curves result, which indicates a different molded part filling - 2. Injection molding of polyester bulk molding compounds with nonreturn valve. In contrast, free-flowing thermoset materials are processed without nonreturn valve. Accordingly changes in viscosity cause the return flow behavior to fluctuate by means of the screw theads and the molded part filling - 3. Basic condition of the test series with BMC-polyester bulk molding compounds: CX 200-750 PolySet injection molding machine with AZ 100 automatic feed unit Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection Polyesters Pression -- Contrôle Procédés de fabrication Thermodurcissables Index. décimale : 668.4 Plastiques, vinyles Résumé : Their characteristic property profile makes thermosets attractive for many high-performance applications. Batch fluctuations, as well as process and environmental instability, produce disruptive effects in the injection molding of this highly filled, mold cross-linking material class, which have a direct impact on part quality. As part of the "QuaProDur" research project, alongside the Rosenheim University of Applied Sciences, the Deckerform Produktionssysteme GmbH tool manufacturer and the HBW-Gubesch Thermoforming GmbH plastic fabrication company (all located in Germany), KraussMaffei is optimizing the processing of thermoset molding compounds. En ligne : https://drive.google.com/file/d/1qtsLHOixZoEYbbMJAPI7pdZ82KbqQ53G/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29134 [article]

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No more weight problems / Benjamin Pearson in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 7 (2020)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 7 (2020) . - p. 25-27 Titre : No more weight problems : Dynamic adjustment of switchover pressure and holding pressure to achieve a constantpart weight Type de document : texte imprimé Auteurs : Benjamin Pearson, Auteur ; Patrick Pazour, Auteur Année de publication : 2020 Article en page(s) : p. 25-27 Langues : Anglais (eng) Catégories : Logiciels Matières plastiques -- Moulage par injection Poids -- Contrôle Pression -- Contrôle Index. décimale : 668.4 Plastiques, vinyles Résumé : HiQ Flow is Wittmann Battenfeld’s answer to the challenge of fluctuating shot weights in injection-molded parts. The assistant system modifies the process parameters in the course of the same shot to counteract vis-cosity fluctuations caused by batch fluctuations in the material or by the use of regrind. Note de contenu : - How does the assistance system function ? - Benchmark test with automotive components - Cavity pressure as a decisive reference value for quality - A question of distribution - Figure : The HiQ Flow software corrects viscosity deviations during the injection and holding pressure phases within the same shot, based on the measurement values taken from the injection molding machine - Fig. 1 : Injection profile over time for two materials of different viscosities (blue for low and red for high viscosity), with active support from HiQ Flow. The highlighted area represents the period of time for which the injection work is calculated. HiQ Flow shifts the changeover point and the holding pressure level within the same shot on the basis of reference values - Fig. 2 : Peak cavity pressure per shot for three different materials. In the first section, HiQ Flow is deactivated, in the second section, it is switched on. This shows that with HiQ Flow being acti-vated, a stationary cavity pressure and consequently repeatable cavity filling has been achieved - Fig. 3 : Combined box plot to compare the peak cavity pressures per material and test series - Fig. 4 : Combined box plot for comparison of the maximum peak cavity pressures with deactivated and activated HiQ Flow En ligne : https://drive.google.com/file/d/1vqso-M0QdRC2qEk5BqSnif4OYykdyq9a/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34813 [article]

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One tool, one shot, three parts / Simon Wurzbacher in KUNSTSTOFFE INTERNATIONAL, Vol. 113, N° 2 (2023)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 113, N° 2 (2023) . - p. 36-40 Titre : One tool, one shot, three parts : Mold, hot runner and process technology Type de document : texte imprimé Auteurs : Simon Wurzbacher, Auteur ; Julian Shild, Auteur Année de publication : 2023 Article en page(s) : p. 36-40 Langues : Anglais (eng) Catégories : Canaux chauffants Matières plastiques -- Moulage par injection Moules d'injection Pression -- Contrôle Procédés de fabrication Index. décimale : 668.4 Plastiques, vinyles Résumé : Family molds offer great potential for reducing costs. They are capable of producing multiple parts of different size and wall thickness in a single shot. The challenge lies in the design of the molds and the process control. Synventive solves this task with cavity-independent pressure control. Note de contenu : - Challenges in the design of family molds - Machines, automation and software work hand in hand - Comparing conventional and pressure-based process control - Individual cavities are filled independently of time and pressure - Reducing the closing force with pressure-based process control - Melt pressure control reduces mold breathing En ligne : https://drive.google.com/file/d/1ytRphbM108jGtXmD9mCC7BAqlsfODDKF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39334 [article]

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Precise process control with InjectiX / Katharina Hornberg in KUNSTSTOFFE INTERNATIONAL, Vol. 113, N° 3 (2023)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 113, N° 3 (2023) . - p. 36-39 Titre : Precise process control with InjectiX : Phase-unifying cavity pressure control for PCR processing Type de document : texte imprimé Auteurs : Katharina Hornberg, Auteur ; Marko Vukovic, Auteur ; Jonas Gerads, Auteur ; Yannik Lockner, Auteur ; Christoph Zimmermann, Auteur ; Mauritius Schmitz, Auteur ; Sebastian Stemmler, Auteur ; Christian Hopmann, Auteur ; Dirk Abel, Auteur Année de publication : 2023 Article en page(s) : p. 36-39 Langues : Anglais (eng) Catégories : Commande automatique Matières plastiques -- Moulage par injection Matières plastiques -- Moulage par injection -- Appareils et matériel Pression -- Contrôle Procédés de fabrication Productique Index. décimale : 668.4 Plastiques, vinyles Résumé : The Institute for Plastics Processing (IKV) presented an innovative model-predictive process control at K 2022 in collaboration with an industrial consortium and the Institute for Automatic Control (IRT). The technology reduces rejects and achieves higher process stability despite fluctuating material qualities when processing post-consumer recyclates. Note de contenu : - Phase-unifying cavity pressure control - Keeping an eye on the quality - Intuitive presentation of complex correlations - Increased robustness to process variations - Table 1 : Overview of project partners and their function in the trade fair project - Table 2 : Mean values and standard deviations according to material used and type of process control for the entire K - Fig. 1 : The process control consists of a lower-level velocity control and a higher-level cavity pressure control - Fig. 2 : The measuring cell enables the acquisition of quality data with direct database connectio - Fig. 3 : Display of quality data in the process - Fig. 4 : The analysis illustrates the reproducibility of part quality using the example of part weight (Systalen PP-C14002, CirculenRecover green) En ligne : https://drive.google.com/file/d/1j-1D9iulAsZN97_jdvMCqZfnAUqV3Dlw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39754 [article]

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Quality assurance for multiple cavities / Martin Ortgies in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 5 (2021)  

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A quantum of relevant data / Erwin König in KUNSTSTOFFE INTERNATIONAL, Vol. 107, N° 6-7 (06-07/2017)  

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The hot runner valve pin as actuating variable / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 1 (2021)

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