Giving pressure greater weight / Klaus Straka in KUNSTSTOFFE INTERNATIONAL, Vol. 105, N° 8 (08/2015)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 105, N° 8 (08/2015) . - p. 37-39 Titre : Giving pressure greater weight : Often overlooked : the Injection pressure influences the melt flow behavior in injection molding Type de document : texte imprimé Auteurs : Klaus Straka, Auteur ; Georg Steinbichler, Auteur ; Clemens Kastner, Auteur Année de publication : 2015 Article en page(s) : p. 37-39 Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection Polypropylène Pression -- Mesure Viscosité Index. décimale : 668.4 Plastiques, vinyles Résumé : Injection molding machine manufacturers increase the available injection pressures to allow for parts with larger flow path/wall thickness ratios. What is typically not considered, however, is the fact that the pressure also substantially influences the melt flow, and that increasing the injection pressure can be counterproductive in terms of energy efficiency. Note de contenu : - Factors that influence viscosity - Pressure-dependence of viscosity - Influence on the injection process En ligne : https://drive.google.com/file/d/1c0gHOUA7e6jUYneZFbLQ6yDazJjHb_NV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24565 [article]

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Glass parts from an injection molding machine / Dorothea Helmer in KUNSTSTOFFE INTERNATIONAL, Vol. 113, N° 4 (2023)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 113, N° 4 (2023) . - p. 40-43 Titre : Glass parts from an injection molding machine : Novel material made of high-purity quartz glass can be processed like a thermoplastic Type de document : texte imprimé Auteurs : Dorothea Helmer, Auteur ; Clemens Kastner, Auteur Année de publication : 2023 Article en page(s) : p. 40-43 Langues : Anglais (eng) Catégories : Quartz Verre -- Moulage par injection Index. décimale : 668.4 Plastiques, vinyles Résumé : Glass is a high-performance material with properties that are indispensable for many industries. High-precision molded parts made of glass are required in the optics, chemical and medical technology industries. However, traditional glass-processing methods impose limits on parts design, especially for tiny structures. Here, injection molding offers an alternative that is also more energy-efficient, more economical and more sustainable. Glassomer and Engel are jointly tapping into this potential. Note de contenu : - Novel granulate made from high-purity quartz glass - Targeted control over surface properties - Manufacturing process requires precision - Parts of the highest purity and optical quality - A collaboration with a future - Fig. 1 : Traditional glass-manufacturing methods compared with the Glassomer process (A): grinding, polishing and lapping (B), precision glass molding (C), conventional lithography and etching processes for fabricating glass structures at wafer level (D), laser-assisted structuring and downstream etching and polishing (E) - Fig. 2 : The various process steps from granulate to injection-molded “green” part to ready-to-use glass part, as exemplified by a perforated plate - Fig. 3. The multi-stage manufacturing process can produce different surface finishes. As shrinkage can be calculated, a high degree of dimensional accuracy is achieved. - Fig. 4 : The e-motion TL all-electric, tie-bar-less injection molding machine produces high-precision camera lenses from thermoplastics – and now also glass parts - Fig. 5 : Different sample parts were produced at Glassomer. The medical technology part (top right) here served as a feasibility study. It showed that the new quartz glass material could also be processed in molds originally designed for thermoplastic injection molding - Fig 6 : Fine structuring of glass is becoming increasingly important, for example in the field of chemical and pharmaceutical synthesis. High-precision channels can already be produced by the new process En ligne : https://drive.google.com/file/d/1R_G2lwm8RCt81dTg1s3f8_q-xlIBpJex/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40151 [article]

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A special process that is becoming a sustainable normal case / Clemens Kastner in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 2 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 2 (2021) . - p. 34-37 Titre : A special process that is becoming a sustainable normal case : New developments in thermoplastic foam injection molding Type de document : texte imprimé Auteurs : Clemens Kastner, Auteur ; Wolfgang Kienzl, Auteur ; Eva Kobler, Auteur ; Georg Steinbichler, Auteur Année de publication : 2021 Article en page(s) : p. 34-37 Langues : Anglais (eng) Catégories : Intelligence artificielle Mesure Mousses plastiques -- Moulage par injection Thermoplastiques -- Moulage par injection Index. décimale : 668.4 Plastiques, vinyles Résumé : Lightweight parts, energy-saving processing or the practice of combining several process steps into one can all be subsumed under one current buzzword: sustainability. A technology that is highly promising in this regard is thermoplastic foam injection molding. Although in use for decades, the process offers great potential thanks to continuous development work. Note de contenu : - Minimized warpage, improved shape accuracy - Exploiting potential with high-efficiency - Own-developed plasticizing screw - New method for determining the solubility limit - A widespread misconception - Foaming with artificial intelligence - Figure : In physical foam injection molding, a blowing gas is injected into the polymer melt during plasticizing - Fig. 1 : The geometry of the PFS improves the homogeneity of the gas-containing melt - Fig. 2 : Result of the theoretical preparatory work: with increasing gas content in the polymer melt, there is a reduction in the bulk modulus of the mixture. A possible solubility limit cannot be described - Fig. 3 : Example of a bulk modulus measurement: the deflection in the curve indicates that a solubility limit has been reached and ultrasound measurements during injection for verification - Fig. 4 : Use of the bulk modulus method for backpressure reduction when using 0.6 % nitrogen : the decrease of bulk modulus when the backpressures are too low can be seen anjd ultrasound measurements during injection for verification - Fig. 5 : Artificial intelligence is making inroads into foam injection molding: schematic view of the convolutional neural network and its output for parameter adjustment En ligne : https://drive.google.com/file/d/1ckup_syz9vOlOQW_bkXXb5EO6MjrgEgG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35496 [article]

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