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 / 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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