Bioplastics with halogen-free flame retardants / Robert Breuer in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 1-2 (01-02/2019)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 1-2 (01-02/2019) . - p. 31-36 Titre : Bioplastics with halogen-free flame retardants : Foamed boards and foamed injection molded parts made from cellulose acetate with a halogen-free flame retardant system and environmentally friendly blowing agents Type de document : texte imprimé Auteurs : Robert Breuer, Auteur ; Yuxiao Zhang, Auteur ; Christian Hopmann, Auteur Année de publication : 2019 Article en page(s) : p. 31-36 Langues : Anglais (eng) Catégories : Acétate de cellulose L'acétate de cellulose est une matière plastique inventée en 1865. C'est l'ester acétate de la cellulose. Agents de gonflement Bioplastiques Essais (technologie) Essais de comportement au feu Ignifugeants -- Suppression ou remplacement Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Isolation thermique Mousses plastiques Mousses plastiques -- Extrusion Mousses plastiques -- Moulage par injection Polymères expansés Polystyrène Index. décimale : 668.4 Plastiques, vinyles Résumé : Foamed polystyrene boards (XPS) have been used for generations in thermal insulation applications, e.g. for buildings. Due to its comparable mechanical and thermal properties, bio-based cellulose acetate (CA) represents a promising, sustainable alternative which is also an interesting material for technical components due to its heat resistance. However, producing such parts by foam extrusion or foam injection molding with halogen-free flame retardant systems and environmentally friendly blowing agents is a challenge. Note de contenu : - Materials used - Equipmentfor foam extrusion trials - Equipment for foam injection molding trials - Foam extrusion of CA compounds with flame retardant system - Foam injection molding trials - Resulting density of the extruded foam boards - Fire behavior of the extruded foam boards - Injection pressures and foam structures of the injection-molded test specimens - Fire behavior of the injection molded test specimens - Figure : Samples of foamed cellulose acetate with halogen-free flame retardant system after the flammability test - Fig. 1 : Material composition of the tested CA compounds and the polystyrene reference - Fig. 2 : The foam board extrusion line used within the project of the IKV - Fig. 3 : ProFoam system for introducing the blowing agent into the cellulose acetate - Fig. 4 : Foam board densities of the CA compounds investigated in foam extrusion - Fig. 5 : Exemplary foam samples after the flammability test : if the measuring mark is not reached, the test is passed. The sample on the right did not pass the test - Fig. 6 : Measured process pressures in foam injection molding - Fig. 7 : Foam structure of th einjection-molded components : the microscopic images show different homogeneity in cell size and cell distribution depending on the blowing agent and compound formulation En ligne : https://drive.google.com/file/d/1gCSZicOJ1-1a-WJW4Udxs5dc4oVSXLor/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31820 [article]

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Dynamic temperature control in foam injection molding / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 106, N° 8 (08/2016)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 106, N° 8 (08/2016) . - p. 47-51 Titre : Dynamic temperature control in foam injection molding : Targeted improvement of the surface quality and foam structure distribution by dynamic mold temperature control Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Nicolai Lammert, Auteur ; Yuxiao Zhang, Auteur Année de publication : 2016 Article en page(s) : p. 47-51 Langues : Anglais (eng) Catégories : Mousses plastiques -- Moulage par injection Température -- Contrôle Index. décimale : 668.4 Plastiques, vinyles Résumé : Foamed components are gaining increasing importance, which is particularly relevant for aspects of lightweight construction and mobility. In the case of foam injection molding, it is known that the process must be combined with dynamic mold temperature control to achieve an attractive surface quality for use in visible areas. IKV in Aachen, Germany, has now demonstrated for the first time how this process also affects the mechanical properties and foam structures of the components. Note de contenu : - Comparison between external and internal dynamic mold temperature control - Higher mold surface temperatures improve the surface quality - Homogeneous foam structures in flow direction and in direction of the part thickness En ligne : https://drive.google.com/file/d/1VRTmYPSGiU5YR9uNkpTPR61NknYhscPW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27074 [article]

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Foam injection molding for thin-walled packaging / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 10 (10/2019)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 10 (10/2019) . - p. 102-106 Titre : Foam injection molding for thin-walled packaging : Viscosity reduction for molded parts with large flow path/wall thickness ratios foam injection molding for thin-walled packaging Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Yuxiao Zhang, Auteur ; Katrin Theissen, Auteur Année de publication : 2019 Article en page(s) : p. 102-106 Langues : Anglais (eng) Catégories : Emballages en matières plastiques Mousses plastiques -- Moulage par injection Polypropylène Rhéologie Viscosité Index. décimale : 668.4 Plastiques, vinyles Résumé : As physical foam injection molding reduces the melt viscosity, it can be used for the production of thin-walled components. The material savings are not achieved by foaming the polymer, but rather by realizing lower wall thicknesses. The influence of the gas loading process on viscosity reduction and component quality is investigated using selected polypropylene types and an exemplary container geometry. Note de contenu : - Reduced viscosity due to blowing agent loading - Influence of blowing agent loading on component quality - Qualification of foam injection molding for packaging applications - Figure : Foamed and compact box components reveal the potential of foam injection molding for applications with reduced wall thickness - Fig. 1 : The online rheometer makes it possible to determine the viscosity of melts loaded with blowing agent. For this purpose, the pressure difference between the sensor positions is measured - Fig. 2 : With known geometry and a given volume flow, the measurement of the pressure difference between the sensor positions allows the representative viscosity to be calculated - Fig. 3 : Representative viscosity measured at three melt temperatures for polypropylene type FPC45 as a basis for determining the feasible viscosity reduction - Table 1 : These polypropylene types were processed in the MuCell process trials En ligne : https://drive.google.com/file/d/188-NizKwTliwZPiEBvvRdqiVgXS5A0By/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33801 [article]

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Properly foamed with IML / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 3 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 3 (2021) . - p. 36-39 Titre : Properly foamed with IML : How does the addition of blowing agent affect adhesion and molded part properties ? Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Yuxiao Zhang, Auteur ; Jan Wolters, Auteur Année de publication : 2021 Article en page(s) : p. 36-39 Langues : Anglais (eng) Catégories : Adhésion Emballages en matières plastiques Etiquetage dans le moule Mousses plastiques -- Moulage par injection Polypropylène Index. décimale : 668.4 Plastiques, vinyles Résumé : Thermoplastic foam injection molding enables lower melt viscosity due to the addition of blowing agent, which is also attractive for the production of thin-walled packaging. Since injection molded packaging is often decorated through in-mold-labeling, it is important to understand how the blowing agent affects adhesion between the film and the molded part to avoid bubble formation at the interface. Note de contenu : - Lower injection pressure due to the addition of blowing agent and IML - Influence on Film Adhesion and Optical Appearance - Influence of blowing agent on molded part warpage - Foam injection molding in thin-wall applications - Figure : Selecting the right IML film is critical for visually appealing molded parts - Fig. 1 : Sheet geometry with flow aids was used for the tests - Fig. 2 : The injection pressure is reduced by the blowing agent - Fig. 3 : Influence of different IML films on the injection pressure with and without blowing agent for PHC27 and a 0.5 mm thick sheet - Fig. 4 : Warpage X is defined as the distance between the highest and the lowest point in the side view of the sheet - Fig. 5 : Influence of IML film on the molding warpage of a 0.5 mm thick sheet of PHC27 - Table 1 : The following polypropylene grades were processed in the trials using the MuCell process - Table 2 : IML films with different optical and haptic properties and thicknesses were selected for the back-molding tests En ligne : https://drive.google.com/file/d/15O_fCiCMKIMEp_TxvL9vwVA2LEDB-Q9m/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35538 [article]

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