@article{23861,
  author       = {{Altepeter, Matthias and Schöppner, Volker}},
  journal      = {{Kunststoffe}},
  publisher    = {{Carl Hanser Verlag}},
  title        = {{{Materialabbau im Doppelschneckenextruder}}},
  year         = {{2020}},
}

@inproceedings{23865,
  abstract     = {{Regarding the design of single screw extruders, the prediction of the throughput needs to be of high accuracy. The calculation of the solids conveying throughput is particularly important for extruders with a grooved feed section. In contrast to smooth barrel extruders the throughput of the entire plant is determined at the feed section. Various simplifications are necessary for an analytical modelling of the solids conveying, e.g. the classification into conveying cases, the assumption of solid block flow and the assumption of pressure anisotropy coefficients. In numerical simulations with the Discrete Element Method (DEM), which has recently been successfully used to describe solids conveying in smooth barrel extruders, the simplifications mentioned above are not taken into account. Here, the pellets are approximated as spherical particles or particles composed of spheres. Based on virtual overlaps, contact models and the solution of Newton's equations of motion, a more complex consideration of the pellet flow is possible. In each iteration step of the simulation, the particle velocities, contact forces and derived quantities, e.g. the mass throughput in the screw channel and the grooves or the radial pressure build-up along the grooved barrel can be evaluated. Therefore, a DEM simulation model can be investigated by means of statistical design of experiments in order to convert the target values into a metamodel by regression. Long computation times of numerical simulations will be avoided in this matter as well as too simple assumptions of analytical approaches. The influencing parameters to be simulated are divided into material, geometry and process parameters. Relevant material parameters are the coefficients of friction of the polymer-polymer and polymer-steel surface as well as the restitution coefficient and the particle diameter. The geometry is varied in the form of the screw diameter, the channel depth and pitch, the number of grooves and their width, depth and angle. By varying the angle, both conventional axial grooves and helical grooves are taken into account. Finally, the process parameters speed and backpressure are also considered in the simulations. In order to reduce the simulation effort, irrelevant parameters are identified in preliminary investigations.
}},
  author       = {{Schöppner, Volker and Brüning, Florian}},
  booktitle    = {{Advances in Polymer Processing 2020: Proceedings of the International Symposium on Plastics Technology}},
  editor       = {{Hopmann, Christian and Dahlmann, Rainer}},
  publisher    = {{Springer}},
  title        = {{{Development of a Solids Conveying Throughput Model for Grooved Barrel Extruders based on Discrete Element Simulations}}},
  year         = {{2020}},
}

@article{23868,
  author       = {{Albrecht, Mirko and Bialaschik, Max and Gehde, Michael and Schöppner, Volker}},
  isbn         = {{978-3-96144-098-6 }},
  journal      = {{DVS CONGRESS 2020 - Große Schweißtechnische Tagung}},
  publisher    = {{DVS Media GmbH}},
  title        = {{{Einfluss der Materialschädigung auf die Schweißnahtqualität beim Warmgasstumpfschweißen von Polyamiden}}},
  volume       = {{365}},
  year         = {{2020}},
}

@inproceedings{23873,
  author       = {{Albrecht, Mirko and Bialaschik, Max and Gehde, Michael and Schöppner, Volker}},
  location     = {{Pretoria}},
  title        = {{{Hot gas welding – Influences of the tool design}}},
  doi          = {{10.1063/5.0029478}},
  year         = {{2020}},
}

@inproceedings{24245,
  author       = {{Schöppner, Volker and Wübbeke, Andrea and Geißler, B. and Schmidt, M. and Maginer, A. and Wu, T. and Niendorf, T. and Jakob, F. and Heim, H.}},
  booktitle    = {{73rd Annual Assembly of the International Institute of Welding (IIW)}},
  location     = {{Marina Bay (Singapore)}},
  publisher    = {{Springer-Verlag}},
  title        = {{{Investigation of residual stresses of hot plate welding}}},
  year         = {{2020}},
}

@article{24236,
  abstract     = {{In diesem Artikel werden das Scherzugverhalten und der morphologische Zustand von konturgeschweißtem Polypropylen (PP) mit einem Massenanteil von 0,2% Ruß untersucht. Dabei zeigen die Ergebnisse ...}},
  author       = {{Schöppner, Volker and Wübbeke, Andrea and Schriegel, Fabian  and Paul, Andrej  and Tiemann, Michael and Geißler, Bastian  and Schmidt, Michael  and Magnier, Arnaud  and Niendorf, Thomas }},
  journal      = {{Joining Plastics}},
  pages        = {{30--35}},
  title        = {{{Selected Aspects for the Assessment of Laser Transmission Welding}}},
  year         = {{2020}},
}

@inproceedings{24472,
  author       = {{Schöppner, Volker and Wübbeke, Andrea and Paul, A. and Tiemann, M. and Austermeier, Laura and Fitze, M. and Chen, M. and Jakob, F. and Heim, H.-P- and Wu, T. and Niendorf, T. and Röhricht, M.-L. and Schmidt, M.}},
  booktitle    = {{ANTEC20}},
  location     = {{Texas (USA)}},
  title        = {{{LONG- AND SHORT-TERM TENSILE STRENGTH AND MORPHOLOGY OF JOINED BETA-NUCLEATED POLYPROPYLENE PARTS}}},
  year         = {{2020}},
}

@inproceedings{25617,
  author       = {{Schöppner, Volker and Sporkmann, F.}},
  booktitle    = {{35th International Conference of the Polymer Processing Society (PPS)}},
  location     = {{Cesme (Türkei)}},
  title        = {{{Analysis of the Characteristic Flow Areas for Erdmenger-Elements to Predict the Throughput-Pressure Behavior of Co-Rotating Twin Screw Extruders by Using 3D FEM Simulation}}},
  year         = {{2019}},
}

@inproceedings{25622,
  author       = {{Schöppner, Volker and Dörner, M.}},
  booktitle    = {{77th Annual Technical Conference of the Society of Plastics Engineers (ANTEC)}},
  location     = {{Detroit (USA)}},
  title        = {{{COMPARISON OF THE CONVENTIONAL AND THE DISPERSE MELTING MODEL REGARDING DIFFERENT PROCESS PARAMETERS}}},
  year         = {{2019}},
}

@inproceedings{25623,
  author       = {{Schöppner, Volker and Resonnek, V.}},
  booktitle    = {{77th Annual Technical Conference of the Society of Plastics Engineers (ANTEC)}},
  location     = {{Detroit (USA)}},
  title        = {{{DETERMINATION OF THE BARREL TEMPERATURE SETTING OF SINGLE SCREW EXTRUDERS USING FUZZY LOGIC}}},
  year         = {{2019}},
}

@book{25627,
  author       = {{Schöppner, Volker and Westhues, K.}},
  isbn         = {{978-3-939382-14-0}},
  title        = {{{Entwicklung eines Modells zur Berechnung der initialen Aufschmelzvorgänge in gleichläufigen Doppelschneckenextrudern}}},
  year         = {{2019}},
}

@article{25628,
  author       = {{Schöppner, Volker and Walter, J.}},
  journal      = {{GAK-Gummi Fasern Kunststoffe}},
  pages        = {{S. 152--159}},
  title        = {{{Entwicklung von Scale-Up Regeln für kaltgefütterte Kautschukstiftextruder Teil 1}}},
  year         = {{2019}},
}

@article{25629,
  author       = {{Schöppner, Volker and Walter, J.}},
  journal      = {{GAK Gummi Faser Kunststoffe}},
  pages        = {{206--213}},
  title        = {{{Entwicklung von Scale-Up Regeln für kaltgefütterte Kautschukstiftextruder Teil 2}}},
  year         = {{2019}},
}

@article{25633,
  author       = {{Schöppner, Volker and Resonnek, V.}},
  issn         = {{0023-5563}},
  journal      = {{Kunstsstoffe}},
  pages        = {{56--61}},
  title        = {{{Extruder optimier dich!}}},
  year         = {{2019}},
}

@inproceedings{25634,
  author       = {{Schöppner, Volker}},
  booktitle    = {{VDI Wissensforum - Schweißen von Kunststoffen}},
  location     = {{Paderborn (Deutschland)}},
  title        = {{{Grundlagen der Haftung in der Grenzfläche beim Kunststoffschweißprozess}}},
  year         = {{2019}},
}

@inproceedings{24326,
  author       = {{Vogtschmidt, Sascha and Schöppner, Volker}},
  location     = {{Bratislava}},
  title        = {{{Vibration welding of components with angled areas in the direction of vibration}}},
  year         = {{2019}},
}

@inproceedings{25736,
  author       = {{Schöppner, Volker and Bayazian, H. and Yadegari, Ali }},
  booktitle    = {{77th Annual Technical Conference of the Society of Plastics Engineers (ANTEC)}},
  location     = {{Detroit (USA)}},
  title        = {{{Morphology Development in LLDPE Stretch Films Prepared with Different Cast Film Process Parameters}}},
  year         = {{2019}},
}

@inproceedings{25737,
  author       = {{Schöppner, Volker and Sporkmann, F. and Heide, Alexander }},
  booktitle    = {{35th International Conference of the Polymer Processing Society (PPS)}},
  location     = {{Cesme (Türkei)}},
  title        = {{{New Analytical Approach to Calculate the Melt Flow within The Co-Rotating Twin Screw Extruder by Using the Performance Mapping Method}}},
  year         = {{2019}},
}

@inproceedings{25746,
  author       = {{Schöppner, Volker and Bayazian, H. and Yadegari, Ali and Haddad, Hoda }},
  booktitle    = {{35th PPS}},
  location     = {{Cesme-Izmir (Türkei)}},
  title        = {{{Orientation in LLDPE Cast Films Manufactured under Different Processing Parameters}}},
  year         = {{2019}},
}

@inproceedings{25750,
  author       = {{Schöppner, Volker and Sporkmann, F.}},
  booktitle    = {{VDI Wissensforum}},
  location     = {{Stuttgart (Deutschland)}},
  title        = {{{Scale up von Doppelschneckenmaschinen}}},
  year         = {{2019}},
}