@inproceedings{34720, author = {{Schöppner, Volker and Köllermeier, Jonas}}, location = {{Fukuoka}}, title = {{{Application of a Dynamic Approach to Determine the Optimal Barrel Temperature of Single Screw Extruders}}}, year = {{2022}}, } @inproceedings{34726, author = {{Schöppner, Volker and Köllermeier, Jonas}}, location = {{Charlotte}}, title = {{{Development of an Inline-Measurement System of the Surface Temperature of Square Hollow Profiles}}}, year = {{2022}}, } @book{48356, author = {{Schöppner, Volker and Vogtschmidt, Sascha}}, isbn = {{978-3-96144-190-7 }}, pages = {{534--540}}, title = {{{Schweißnahtkennwerte für die lebensdaueroptimierte Bauteilauslegung von hochtemperaturbeständigen Thermoplasten}}}, year = {{2022}}, } @book{48358, author = {{Schöppner, Volker and Dörner, M. and Frank, Maximilian and Schall, Christoph}}, title = {{{On the Wave to Successful Mixing}}}, year = {{2022}}, } @article{34733, abstract = {{Due to their valuable properties (low weight, and good thermal and mechanical properties), glass fiber reinforced thermoplastics are becoming increasingly important. Fiber-reinforced thermoplastics are mainly manufactured by injection molding and extrusion, whereby the extrusion compounding process is primarily used to produce fiber-filled granulates. Reproducible production of high-quality components requires a granulate in which the fiber length is even and high. However, the extrusion process leads to the fact that fiber breakages can occur during processing. To enable a significant quality enhancement, experimentally validated modeling is required. In this study, short glass fiber reinforced thermoplastics (polypropylene) were produced on two different twin-screw extruders. Therefore, the machine-specific process behavior is of major interest regarding its influence. First, the fiber length change after processing was determined by experimental investigations and then simulated with the SIGMA simulation software. By comparing the simulation and experimental tests, important insights could be gained and the effects on fiber lengths could be determined in advance. The resulting fiber lengths and distributions were different, not only for different screw configurations (SC), but also for the same screw configurations on different twin-screw extruders. This may have been due to manufacturer-specific tolerances.}}, author = {{Rüppel, Annette and Wolff, Susanne and Oldemeier, Jan Philipp and Schöppner, Volker and Heim, Hans-Peter}}, issn = {{2073-4360}}, journal = {{Polymers}}, keywords = {{Polymers and Plastics, General Chemistry}}, number = {{15}}, publisher = {{MDPI AG}}, title = {{{Influence of Processing Glass-Fiber Filled Plastics on Different Twin-Screw Extruders and Varying Screw Designs on Fiber Length and Particle Distribution}}}, doi = {{10.3390/polym14153113}}, volume = {{14}}, year = {{2022}}, } @article{29948, author = {{Brüning, Florian and Schöppner, Volker}}, journal = {{Polymers 14}}, keywords = {{Computing Resources Provided by the Paderborn Center for Parallel Computing}}, title = {{{Numerical Simulation of Solids Conveying in Grooved Feed Sections of Single Screw Extruders}}}, doi = {{https://doi.org/10.3390/polym14020256}}, year = {{2022}}, } @article{34708, author = {{Schöppner, Volker and Gevers, Karina and Tornede, A. and Wever, M. and Hüllermeier, E.}}, journal = {{Welding in the World}}, pages = {{14}}, title = {{{A comparison of heuristic, statistical, and machine learning methods for heated tool butt welding of two different materials}}}, year = {{2022}}, } @misc{24372, author = {{Gevers, Karina and Schöppner, Volker}}, booktitle = {{K-Zeitung}}, keywords = {{Infrarotschweißen, Glasfaserverstärkte Kunststoffe, Lebensdauer, Langzeitbelastung}}, number = {{1-2}}, pages = {{19}}, title = {{{Lebensdauer vorhersagen?}}}, year = {{2021}}, } @inproceedings{24382, author = {{Gevers, Karina and Schöppner, Volker and Hüllermeier, Eyke}}, location = {{online}}, title = {{{Heated tool butt welding of two different materials – Established methods versus artificial intelligence}}}, year = {{2021}}, } @inproceedings{24389, author = {{Arndt, Theresa and Schöppner, Volker}}, title = {{{Development of scale up rules for quasi-simultaneous laser transmission welding of thermoplastics}}}, year = {{2021}}, } @inproceedings{24441, author = {{Frank, Maximilian and Schöppner, Volker}}, booktitle = {{ANTEC® 2021}}, title = {{{DEVELOPMENT OF A NEW METHOD TO EVALUATE THE DISTRIBUTIVE MIXING QUALITY BASED ON THE PARTICLE TRACKING METHOD AND THE DELAUNAY TRIANGULATION}}}, year = {{2021}}, } @inproceedings{26630, author = {{Altepeter, Matthias and Schöppner, Volker and Wanke, Sven}}, title = {{{Analysis and modelling of the material degradation of polypropylene on the co-rotating twin-screw extruder}}}, year = {{2021}}, } @article{23839, author = {{Marschik, Christian and Roland, Wolfgang and Döner, Marius and Steinbichler, Georg and Schöppner, Volker}}, journal = {{Polymers}}, publisher = {{MDPI AG }}, title = {{{A New Approach to Modeling Leakage Flow in 2 Single-Screw Extrusion}}}, year = {{2021}}, } @article{23867, abstract = {{The joining of plastics is required because component geometries are severely restricted in conventional manufacturing processes such as injection molding or extrusion. In addition to established processes such as hot plate welding, infrared welding, or vibration welding, hot gas butt welding is becoming more and more important industrially due to its advantages. The main benefits are the contactless heating process, the suitability for glass fiber reinforced, and high-temperature plastics as well as complex component geometries. However, various degradation phenomena can occur during the heating process used for economic reasons, due to the presence of oxygen in the air and to the high gas temperatures. In addition, the current patent situation suggests that welding with an oxidizing gas is not permissible depending on the material. On the other hand, however, there is experience from extrusion welding, with which long-term resistant weld seams can be produced using air. Investigations have shown that the same weld seam properties can be achieved with polypropylene using either air or nitrogen as the process gas. Experimental investigations have now been carried out on the suitability of different gases with regard to the weld seam quality when welding polyamides, which are generally regarded as more prone to oxidation. The results show that weld strengths are higher when nitrogen is used as process gas. However, equal weld strengths can be achieved with air and nitrogen when the material contains heat stabilizers.}}, author = {{Bialaschik, Max and Schöppner, Volker and Albrecht, Mirko and Gehde, Michael}}, issn = {{0043-2288}}, journal = {{Welding in the World}}, pages = {{1161--1169}}, title = {{{Influence of material degradation on weld seam quality in hot gas butt welding of polyamides}}}, doi = {{10.1007/s40194-021-01108-0}}, year = {{2021}}, } @misc{31758, author = {{Schöppner, Volker and Martens, Jan Hendrik}}, booktitle = {{Kunststoffe}}, issn = {{0023- 5563}}, pages = {{91--93}}, title = {{{Eine runde Sache}}}, year = {{2021}}, } @misc{31776, author = {{Schöppner, Volker and Gevers, Karina}}, booktitle = {{K-Zeitung}}, issn = {{1436-6401}}, pages = {{19}}, title = {{{ Lebensdauer vorhersagen?}}}, year = {{2021}}, } @inproceedings{31777, author = {{Schöppner, Volker and Altepeter, Matthias and Wanke, Sven}}, booktitle = {{36th International Conference of the Polymer Processing Society (PPS)}}, location = {{Melbourne (Kanada)}}, title = {{{Material Degradation of Polypropylene on the Co-Rotating Twin Screw Extruder}}}, year = {{2021}}, } @inproceedings{31782, author = {{Schöppner, Volker and Kleinschmidt, Dennis}}, booktitle = {{27. Techomer - Fachtagung über Verarbeitung und Anwendung von Polymeren}}, location = {{Chemnitz (Online) }}, title = {{{Viskoelastische Materialmodellierung in Strömungssimulationen}}}, year = {{2021}}, } @inproceedings{31785, author = {{Schöppner, Volker and Albrecht, M. and Gehde, M. and Bialaschik, Max Oliver}}, booktitle = {{Technomer}}, location = {{ Chemnitz (Deutschland)}}, title = {{{Warmgasstumpfschweißen - Einfluss des Werkzeugdesigns und des verwendeten Prozessgases auf das Erwärm- und Schweißverhalten}}}, year = {{2021}}, } @inproceedings{31784, author = {{Schöppner, Volker and Dörner, M. and Schall, Christoph Wilhelm Theodor}}, booktitle = {{Technomer 2021}}, location = {{Chemnitz}}, title = {{{Vorteilhaftes Prozessverhalten von Wave-Schnecken in der Einschneckenextrusion}}}, year = {{2021}}, }