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Auteur Christian Hopmann
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- RWTH Aachen - Germany
- Institute of Plastics Processing (IKV) - Aachen - Germany
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Dynamic temperature control in foam injection molding / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 106, N° 8 (08/2016)
[article]
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 -- ContrôleIndex. 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 thicknessEn ligne : https://drive.google.com/file/d/1VRTmYPSGiU5YR9uNkpTPR61NknYhscPW/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27074
in KUNSTSTOFFE INTERNATIONAL > Vol. 106, N° 8 (08/2016) . - p. 47-51[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18254 - Périodique Bibliothèque principale Documentaires Disponible Elastomers of the third dimension / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 107, N° 1-2 (01-02/2017)
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Titre : Elastomers of the third dimension : Silicones as a material group for additive manufacturing on the test bench Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Sarah Schäfer, Auteur ; Anh-Khoa Pham, Auteur Année de publication : 2017 Article en page(s) : p. 14-16 Langues : Anglais (eng) Catégories : Elastomères -- Propriétés mécaniques
Elastomères -- Séchage sous rayonnement ultraviolet
Elastomères silicones vulcanisables à chaud
Impression tridimensionnelle
Salons professionnelsIndex. décimale : 668.4 Plastiques, vinyles Résumé : In addition to improved plant technology, new materials are being developed for additive manufacturing processes. These include elastomers which, by their irreversible cross-linking, have a different behavior than thermoplastics. An investigation shows that commercially available silicone rubbers can be processed via additive manufacturing – with high strength in relation to conventionally manufactured silicone rubbers. Note de contenu : - UV-curing LSR for additive manufacturing
- Comparable mechanical properties
- Surface quality shows potential for improvementEn ligne : https://drive.google.com/file/d/1DznuTVOyosDcni1G2WHuRoTf3DjiAvr4/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27916
in KUNSTSTOFFE INTERNATIONAL > Vol. 107, N° 1-2 (01-02/2017) . - p. 14-16[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18707 - Périodique Bibliothèque principale Documentaires Disponible 18814 - Périodique Bibliothèque principale Documentaires Disponible Everything keeps flowing / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 5 (05/2019)
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Titre : Everything keeps flowing : Structured surfaces in injection molds allow for longer flow paths Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Magnus Orth, Auteur Année de publication : 2019 Article en page(s) : p. 32-35 Langues : Anglais (eng) Catégories : Etat fondu (matériaux)
Matières plastiques -- Moulage par injection
Microstructures
Moules d'injection
Surfaces (Physique)
Surfaces (technologie)Index. décimale : 668.4 Plastiques, vinyles Résumé : The filling of injection molds with plastic melt depends, among other things, on the surface quality of the mold cavity. An application-oriented structuring of the cavity surface increases the length of the flow path of the melt by up to 18 %, depending on the plastic material. This opens up the possibility of achieving longer flow paths with existing injection molding technology. Note de contenu : - Microstructured mold surfaces
- Longer melt flow with structuring and heat
- Insulation effect of entrapped air
- High structural density permits longer flow
- Picture : Plastic melt continues to flow with microstructures in the mold
- Fig. 1 : Cavity with flow meander geometry. the total flow path length is 921 mm
- Fig. 2 : Arrangement of the conical microstructure. These are machined by laser ablatio
- Fig. 3 : The effects and interactions of the investigated parameters show a relevant influence on the flow path length
- Fig. 4 : The influence of the mold structuring on the achievable flow path length is clearly visible, especially with easy-flowing material
- Fig. 5 : Model presentation : the microstructure reduces heat dissipation
- Fig. 6 : At the flow front the structures are not filled
- Fig. 7 : The structure density has a decisive influence on the flow path length of the melt
- Table 1 : Parameters examined and their levels. The temperatures indicated are measured with contact thermometers on the cavity surface and in the melt and are not the values set on the temperature control unit or on the machine control
- Table 2 : Structural specifications of the four cavity inserts usedEn ligne : https://drive.google.com/file/d/1xpxf11UnhYhs9v7twzW-RflQfi6AmUHU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32552
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Code-barres Cote Support Localisation Section Disponibilité 20927 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Everything under one roof : Part 10 and conclusion : the digitalization of plastics processing gets a home Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Pascal Bibow, Auteur Année de publication : 2022 Article en page(s) : p. 10-12 Langues : Anglais (eng) Catégories : Industrie 4.0 Le concept d’Industrie 4.0 correspond à une nouvelle façon d’organiser les moyens de production : l’objectif est la mise en place d’usines dites "intelligentes" ("smart factories") capables d’une plus grande adaptabilité dans la production et d’une allocation plus efficace des ressources, ouvrant ainsi la voie à une nouvelle révolution industrielle. Ses bases technologiques sont l'Internet des objets et les systèmes cyber-physiques.
Matières plastiques -- Industrie
NumérisationIndex. décimale : 668.4 Plastiques, vinyles Résumé : With the completion of the Plastics Innovation Center 4.0, the research infrastructure of the IKV in Aachen, Germany, has been significantly expanded. In conjunction with the expansion of the digital network architecture, researchers can increasingly focus on pragmatic solutions and industry-related projects for digitalization in the following years. The last article in this series takes a look at the technical possibilities for industry-oriented research with project partners. Note de contenu : - Big technology center for complex research processes
- Transferring research results to practical use
- Platform for various optimization-modules
- Closing the gap between simulation and realityEn ligne : https://drive.google.com/file/d/1tcy-ekhfE2eFNssclnnH9ty7hGC5RLbT/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38726
in KUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 9 (2022) . - p. 10-12[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23752 - Périodique Bibliothèque principale Documentaires Disponible Excellent resistance at reduced weight / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 11 (11/2019)
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Titre : Excellent resistance at reduced weight : The qualification of suitable foam injection molding processes enables the use of thermosets in lightweight construction applications Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Maximilian kramer, Auteur ; Stefan Haase, Auteur Année de publication : 2019 Article en page(s) : p. 28-31 Langues : Anglais (eng) Catégories : Agents d'expansion (chimie)
Matériaux -- Allègement
Matières plastiques -- Moulage par injection
Matières plastiques -- Propriétés mécaniques
Sphères creusesIndex. décimale : 668.4 Plastiques, vinyles Résumé : The transfer of foam injection molding from thermoplastic to thermoset processing has not yet been implemented in industrial practice. IKV Aachen has investigated this transfer and has precisely analyzed the economic efficiency of the process and the potential for lightweight construction. Note de contenu : - Which foaming processes are suitable ?
- Hollow glass spheres as an alternative
- Studies with chemical blowing agents
- Pros and cons of hollow glass spheres
- Cost comparison facilitates process selection
- Figure : Foamed thermosets can be used to produce low-density thermally resistant components at low cost
- Fig. 1 : The expansion of the chemical blowing agent in thermoset foam injection molding is similar to thermoplastic foam injection molding in the mold, but the reaction is thermally initiated
- Fig. 2 : The specimen geometry allows the analysis of different material properties
- Fig. 3 : Influence of the process parameters : with an increasing blowing agent content the component weight is reduced. The results of the mechanical analysis are shown on the right
- Fig. 4 : In addition to an increasing content of hollow glass spheres (HGS,) decreasing melt temperatures and injection speeds leat to lower component weights. The stiffness and impact strength can even be improved
- Fig. 5 : The cost comparison calculation shows that the use of chemical blowing agent results in an economic advantage for large quantities. Hollow glass spheres, on the other hand, improve the mechanical propertiesEn ligne : https://drive.google.com/file/d/1i85hS5I34K35GwyaKLUowwPd8M4Mf9o0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33654
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Code-barres Cote Support Localisation Section Disponibilité 21285 - Périodique Bibliothèque principale Documentaires Disponible Fast compression in multiple layers / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)
PermalinkFaultless conductor tracks with a long service life / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 107, N° 3 (03/2017)
PermalinkFeasibility analysis for risk assessment / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 103, N° 8 (08/2013)
PermalinkFibers and nano-fillers combined / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 103, N° 3 (03/2013)
PermalinkFlexibilizing graphite polar plates / Andreas Cohnen in KUNSTSTOFFE INTERNATIONAL, Vol. 106, N° 6-7 (06-07/2016)
PermalinkFlexible blow molded parts of silicone rubber / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 3 (03/2018)
PermalinkFlexible guiding systems for cooling air / Lars Kraus in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 7 (2020)
PermalinkFlow field dynamics in pultrusion injection boxes / Christian Hopmann in JEC COMPOSITES MAGAZINE, N° 141 (07-08/2021)
PermalinkFoam injection molding for thin-walled packaging / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 10 (10/2019)
PermalinkFrequency-dependent behavior of plastics / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 102, N° 11 (11/2012)
PermalinkFrom fatigue behavior to prediction of service life / Walter Michaeli in KUNSTSTOFFE INTERNATIONAL, Vol. 102, N° 4 (04/2012)
PermalinkFunction-integrated lightweight construction for mass production / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 103, N° 9 (09/2013)
PermalinkPermalinkPermalinkHigh surface quality, half the compression force / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 106, N° 3 (03/2016)
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