All about plasticizing screws / Filipp Pühringer in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 10 (2020)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 10 (2020) . - p. 27-29 Titre : All about plasticizing screws : Part 1 of the series discusses the basic design of a plasticizing unit and the correct choice of injection unit Type de document : texte imprimé Auteurs : Filipp Pühringer, Auteur Année de publication : 2020 Article en page(s) : p. 27-29 Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection Plastification Vis de plastification Index. décimale : 668.4 Plastiques, vinyles Résumé : The required screw diameter can be ascertained on the basis of the shot volume. The formula for the average residence time can be used to estimate the degree of utilization and the thermal load on the material. Last but not least, the maximum injection pressure and the available screw torque are key variables for successful injection molding production – basic principles for the selection of a barrel-and-screw combination, and the starting point for further optimization. Note de contenu : - Basic design of the plasticizing unit : shot volume - Residence time as indicator of thermal damage to the material - Reference value for the length of the screw - Maximum screw torque - The required and the maximum injection pressure - Four parameters for decision-making - Figure : Various shapes of plasticizing screws. The correct design is approached in several steps - Fig. 1 : From the material to the nozzle : schematic diagram of the plasticizing system - Fig. 2: Schematic diagram of the recommended stroke utilization. The optimum operating range of a plasticizing unit is at a screw stroke of about 1 to 3D En ligne : https://drive.google.com/file/d/19rh8QdDOnZ6vV-qpiqa5fxyRWd-McFgu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34937 [article]

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All about plasticizing screws in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 1 (2021)

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 1 (2021) . - p. 14-16 Titre : All about plasticizing screws : part 2 of the series deals with basic methods for evaluating a screw geometry Type de document : texte imprimé Année de publication : 2021 Article en page(s) : p. 14-16 Langues : Anglais (eng) Catégories : Conception assistée par ordinateur Vis de plastification Index. décimale : 668.4 Plastiques, vinyles Résumé : Once the basic layout of a plasticizing unit has been determined and the appropriate injection unit has been selected, the development of the screw geometry enters its decisive phase. To be able to carry out the practical test in a resource-saving manner, the designers use simulation tools to assess the screw geometry. What is important here is explained using a 3-zone screw as an example. Note de contenu : - Before all experiments comes the simulation - Experimental screws in original size - Model case for the optimization to the screw geometry - Basic assumptions and throughput behavior - Pressure build-up capacity and melting process curves - Fig. 1 : Schematic diagram of a 3-zone screw with number of screw flights i = 1 - Fig. 2 : Pressure curve along the screw at 50 mm stroke position - Fig. 3 : Melting process curves for the screw at stroke position 50 mm towards the end of the cycle Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35098 [article]

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All about plasticizing screws / Filipp Pühringer in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 26-28 Titre : All about plasticizing screws : Part 3 of the series deals with the tests to optimize the screw geometry Type de document : texte imprimé Auteurs : Filipp Pühringer, Auteur Année de publication : 2021 Article en page(s) : p. 26-28 Langues : Anglais (eng) Catégories : Optimisation géométrique Simulation par ordinateur Vis de plastification Index. décimale : 668.4 Plastiques, vinyles Résumé : In the second part of the series, calculations were carried out on the throughput behaviour, pressure build-up capacity and the melting process on the basis of an exemplary geometry. These results are now to be examined in more detail and subsequently optimized. For this purpose, the effects of adjusting some selected geometry parameters have to be investigated and interpreted. Note de contenu : - Results of the first calculation - Step 1 of Optimizing the geometry : shortening the metering zone - Step 2 of optimizing the geometry : increasing the metering zone depth - A multi-purpose screw geometry - Table 1 : Geometry optimization, test 1 : Metering zone shortened, compression zone lengthened - Table 2 : Geometry optimization, test 2 : Screw with increased flight depth - Figure : Through empirical tests and simulation-supported test series, a screw can be designed in a tailor-made manner for the respective application - Fig. 1 : First test for geometry optimization : Pressure curve along the screw at stroke position 50 mm - Fig. 2 : Second test for geometry optimization : Pressure curve after the increase of flight depth by approx. 28 % En ligne : https://drive.google.com/file/d/1Z6rQQx6B7k2HHTGeODkZ0FRRlVhLsHlL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35717 [article]

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Processing chopped glass directly in the injection molding process / Stefan Schierl in PLASTICS INSIGHTS, Vol. 114, N° 4/2024 (2024)  

[article]  inPLASTICS INSIGHTS > Vol. 114, N° 4/2024 (2024) . - p. 44-47 Titre : Processing chopped glass directly in the injection molding process : Chopped fiber processing - an unusual approach leads to the long fiber goal Type de document : texte imprimé Auteurs : Stefan Schierl, Auteur ; Thomas Drogi, Auteur ; Jan Wiedmann, Auteur ; Dominik Schmidt, Auteur ; Lazlo Giesgen, Auteur Année de publication : 2024 Article en page(s) : p. 44-47 Langues : Anglais (eng) Catégories : Composites à fibres de verre -- Moulage par injection Polypropylène Vis de plastification Index. décimale : 668.4 Plastiques, vinyles Résumé : A new screw geometry for the direct processing of chopped glass fibers significantly expands the field of application for long fiber-reinforced polypropylene. The production of such components through direct processing is significantly more economical and sustainable than with conventional long glass fiber technologies, as process steps such as compounding are no longer necessary. Note de contenu : - New screw geometry - Shear deformation without fiber damage - Aim : Consistent fiber concentration across the component volume - Dispersion of the fibers positively influences the mechanical properties - Comparison with rod pellets and continuous filament direct processing En ligne : https://drive.google.com/file/d/1pLKf5T1khcGa2USb-ZjKe0MdwzX2QZwP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41260 [article]

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The wave must be right in PLASTICS INSIGHTS, Vol. 113, N° 7 (2023)  

[article]  inPLASTICS INSIGHTS > Vol. 113, N° 7 (2023) . - p. 52-54 Titre : The wave must be right : Screw concepts for extrusion Type de document : texte imprimé Année de publication : 2023 Article en page(s) : p. 52-54 Langues : Anglais (eng) Catégories : Matières plastiques -- Extrusion Mélange Plastification Vis d'extrusion Vis de plastification Index. décimale : 668.4 Plastiques, vinyles Résumé : The University of Paderborn, Germany, investigated the mixing effect of several wave screws in comparison with two barrier screws and a 5-section screw. The project will provide information on which screws perform better in the comparison and how to increase the efficiency of extrusion lines. Note de contenu : - Characteristics of wave screws - Specifics of the et screw - Mixing processes in single-screw extrusion - Experiment execution - The mixing quality on the scanner - On the wave to successful mixing En ligne : https://drive.google.com/file/d/1hOEMuic0fSgJGDmsNsxPNkDd2npQT4mn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40336 [article]

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