@book{25751, author = {{Schöppner, Volker and Meilwes, P. and Westhues, K.}}, isbn = {{978-3-939382-14-0 }}, title = {{{Schmelzefilter}}}, year = {{2019}}, } @article{25753, author = {{Schöppner, Volker and Sporkmann, F.}}, issn = {{2053-7174}}, journal = {{Compounding World}}, pages = {{47--56}}, title = {{{Simulation aids compounding success}}}, year = {{2019}}, } @article{25754, author = {{Schöppner, Volker and Brüning, Florian}}, issn = {{1618-8357}}, journal = {{WAK Jahresmagazin}}, pages = {{64--67}}, title = {{{Simulation der Feststoffförderung im Einschneckenextruder}}}, year = {{2019}}, } @inproceedings{25759, author = {{Schöppner, Volker and Westhues, K.}}, booktitle = {{VDI Wissensforum}}, location = {{Stuttgart (Deutschland)}}, title = {{{Vortrag „Aufschmelzen“ Optimierter Betrieb und Scale-up von Doppelschnecken-Extrudern}}}, year = {{2019}}, } @article{23866, author = {{Schöppner, Volker and Brüning, Florian}}, issn = {{1618-8357}}, journal = {{WAK Jahresmagazin}}, title = {{{Simulation der Feststoffförderung im Einzug von Einschneckenextrudern}}}, year = {{2019}}, } @inproceedings{23879, author = {{Albrecht, Mirko and Gehde, Michael and Bialaschik, Max and Schöppner, Volker}}, isbn = {{978-3-939382-14-0 }}, location = {{Chemnitz}}, title = {{{Einfluss des Werkzeugdesignes auf das Erwärmverhalten beim Warmgasschweißen}}}, year = {{2019}}, } @inproceedings{22027, abstract = {{Additive manufacturing processes, like the Fused Deposition Modeling (FDM) process, do not need product-specific tools and create parts directly from the CAD data. In the FDM process, the semi-finished product, a wire of a thermoplastic polymer, is melted and forced through a nozzle. The continuous positioning of this nozzle allows the polymer to weld together strand by strand and layer by layer to produce a component. Because no mold is used in the FDM process, no holding pressure can be generated as in injection molding processes, in which the holding pressure is used to minimize the shrinkage and warpage of the part. In the FDM process, the part is generated in an ambient pressure environment. Each strand cools down and shrinks separately. This causes residual stresses in the part that can lead to major warpage and a complete stoppage of the process. This is the main reason why the material selection in the FDM process is restricted in comparison to conventional polymer processing technologies. In this paper, the warpage of different polymers is quantified as a criterion for evaluating the processability of polymers in the FDM process. Due to the process principle, the part properties in the FDM process are mainly influenced by the machine quality and the data processing, so that it is difficult to test a material for FDM independently of the machine and the data processing. Considering these influences, a custom-built specimen is created to test and quantify the warpage of different types of blended and reinforced polyamide 6. Considering the experimentally investigated warpage, the materials can be evaluated and the warpage can be related to the shrinkage investigated in pvT measurements. This procedure allows the machine- and process-independent rating of the processability in terms of warpage for different materials. Alongside other criteria, this is a necessary step to develop new materials with good processability in the FDM process.}}, author = {{Schöppner, Volker and Schumacher, C. and Fels, C.}}, booktitle = {{AIP Conference Proceedings}}, publisher = {{AIP Publishing}}, title = {{{A Method to Evaluate the Process-Specific Warpage for Different Polymers in the FDM Process}}}, doi = {{10.1063/1.5088315}}, year = {{2019}}, } @article{25619, author = {{Schöppner, Volker and Dörner, M. and Marschik, C. and Roland, W. and Miethlinger, J. and Steinbichler, G.}}, journal = {{Polymers}}, pages = {{1488--1515}}, title = {{{Application of Network Analysis to Flow Systems with Alternating Wave Channels: Part A (Pressure Flows).}}}, year = {{2019}}, } @inproceedings{44308, author = {{Bayazian, Hoda and Schöppner, Volker and Yadegari , Ali and Haddad , Hoda}}, location = {{Türkei }}, title = {{{Orientation in LLDPE Cast Films Manufactured under Different Processing Parameters}}}, year = {{2019}}, } @inproceedings{25641, abstract = {{Langzeitfestigkeit von Schweißungen aus PP unter Berücksichtigung der Morphologie}}, author = {{Schöppner, Volker and Wübbeke, Andrea and Paul, Andre and Tiemann, Michael and Fitze, F. and Austermeier, Laura and Chen, M. and Jakob, F. and Heim, H.-P. and Wu, T. and Niendorf, T. and Röhricht, M-L. and Schmidt, M.}}, booktitle = {{Werkstoffwoche (2019)}}, location = {{Dresden (Deutschland)}}, title = {{{Langzeitfestigkeit von Schweißungen aus PP unter Berücksichtigung der Morphologie}}}, year = {{2019}}, } @inproceedings{26929, author = {{Schöppner, Volker and Schumacher, Christian and Fels, Camilla}}, booktitle = {{34th International Conference of the Polymer Processing Society (PPS)}}, location = {{Taipei (Taiwan)}}, title = {{{A Method to Evaluate the Process-Specific Warpage for Different Polymers in the FDM Process}}}, year = {{2018}}, } @article{26934, author = {{Schöppner, Volker and Sporkmann, F. and Markarian, J.}}, journal = {{Compounding World}}, number = {{Onlineausgabe März}}, pages = {{31--40}}, title = {{{Building the Perfect Model}}}, year = {{2018}}, } @article{26935, author = {{Schöppner, Volker and Meilwes, P.}}, journal = {{Konstruktion}}, title = {{{CAD-Datenerzeugung zur Druckverlustsimulation von Filtermedien}}}, volume = {{70. Jg. Heft 11}}, year = {{2018}}, } @inproceedings{26940, author = {{Schöppner, Volker and Westhues, K.}}, location = {{Leverkusen (Deutschland)}}, title = {{{Differenzierte Betrachtung der Energieeinträge in Feststoffförder- und Aufschmelzzone gleichläufiger Doppelschneckenextruder}}}, year = {{2018}}, } @inproceedings{26944, author = {{Schöppner, Volker and Bayazian, H. and Yadgari, A. and Morshedian, J. and Jamshidi, A. and Razavi-Nouri, M.}}, booktitle = {{34th International Conference of the Polymer Processing Societey (PPS)}}, location = {{Taipei (Taiwan)}}, title = {{{Evaluation of Morphology and Crystallinity of Biaxially Oriented PP Films}}}, year = {{2018}}, } @inproceedings{26945, author = {{Schöppner, Volker and Fiebig, I.}}, booktitle = {{71st Annual Assembly of the International Institute of Welding (IIW)}}, location = {{Bali (Indonesien)}}, title = {{{Evaluation of the Elongation Ability of Polymer Melts for the Extension of the Design Freedom in Vibration Welding}}}, year = {{2018}}, } @article{26947, author = {{Schöppner, Volker and Fiebig, J.}}, issn = {{0043-2288}}, journal = {{Welding in the World}}, number = {{Heft 5}}, pages = {{997--1012}}, title = {{{Factors Influencing the Fiber Orientation in Welding of Fiber-Reinforced Thermoplastics}}}, volume = {{62. Jg.}}, year = {{2018}}, } @article{26950, author = {{Schöppner, Volker and Fiebig, I.}}, issn = {{0043-2288}}, journal = {{Welding in the World}}, number = {{6}}, pages = {{1301--1309}}, title = {{{Influence of Fiber Orientation and Weld Position in Welding Injection-Molded Fiber-Reinforced Thermoplastics}}}, volume = {{62}}, year = {{2018}}, } @inproceedings{26952, author = {{Schöppner, Volker and Bayazian, H.}}, booktitle = {{34th International Conference of the Polymer Processing Societey (PPS)}}, location = {{Taipei (Taiwan)}}, title = {{{Investigation of Molecular Weight Distributions during Extrusion Process of Polypropylene by Rheometry Experiment}}}, year = {{2018}}, } @inproceedings{26955, author = {{Schöppner, Volker and Schumacher, C. and Fels, C.}}, booktitle = {{WAK-Symposium}}, location = {{Bayreuth (Deutschland)}}, title = {{{Materialentwicklung für FLM}}}, year = {{2018}}, }