@inproceedings{27342,
  author       = {{Schöppner, Volker and Böhm, N.}},
  booktitle    = {{16th Workshop Odour and Emissions of Plastic Materials}},
  location     = {{Kassel (Deutschland)}},
  title        = {{{Herausforderungen bei der Verwendung von Wood-Plastic-Composites(WPC) im Automobilinnenbereich}}},
  year         = {{2014}},
}

@inproceedings{27344,
  author       = {{Schöppner, Volker and Henke, B.}},
  booktitle    = {{30th International Conference of the Polymer Processing Society (PPS)}},
  location     = {{Cleveland (USA)}},
  title        = {{{Illustration of Cross Flows of Polystyrene Melts Through a Coat-Hanger Die}}},
  year         = {{2014}},
}

@inproceedings{27346,
  author       = {{Schöppner, Volker and Evers, F.}},
  booktitle    = {{72nd Annual Technical Conference of the Society of Plastics Engineers (ANTEC)}},
  location     = {{Las Vegas (USA)}},
  title        = {{{Influence of Flame Retardant Material on the Weld Strength of Plastic Parts}}},
  year         = {{2014}},
}

@inproceedings{27348,
  author       = {{Schöppner, Volker and Brockhaus, S. and Klie, B. and Giese, U.}},
  booktitle    = {{11. Kautschuk-Herbst-Kolloquium (KHK)}},
  location     = {{Hannover (Deutschland)}},
  title        = {{{Investigations about High-Speed Rubber Extrusion}}},
  year         = {{2014}},
}

@inproceedings{27349,
  author       = {{Schöppner, Volker and Littek, S.}},
  booktitle    = {{30th International Conference of the Polymer Processing Society (PPS)}},
  location     = {{Cleveland (USA)}},
  title        = {{{Measurement and Calculation of the Material Degradation of Polystyrene and Modeling of the Degradation by using REX}}},
  year         = {{2014}},
}

@inproceedings{27354,
  author       = {{Schöppner, Volker and Schadomsky, M. and Lemke, F.}},
  booktitle    = {{11. Kautschuk-Herbst-Kolloquium (KHK)}},
  location     = {{Hannover (Deutschland)}},
  title        = {{{Optimisation of the Mixing Behaviour of Rubber Pin-Type Extruders}}},
  year         = {{2014}},
}

@inproceedings{27356,
  author       = {{Schöppner, Volker and Wibbeke, A.}},
  booktitle    = {{30th International Conference of the Polymer Processing Society (PPS)}},
  location     = {{Cleveland (USA)}},
  title        = {{{Production of Graded Structures in Films}}},
  year         = {{2014}},
}

@inproceedings{27357,
  author       = {{Schöppner, Volker and Wibbeke, A.}},
  booktitle    = {{58th Ilmenau Scientific Colloquium}},
  location     = {{Ilmenau (Deutschland)}},
  title        = {{{Stretching of Polycarbonate}}},
  year         = {{2014}},
}

@inproceedings{27360,
  author       = {{Schöppner, Volker and Evers, F. and Lakemeyer, P.}},
  booktitle    = {{67th Annual Assembly of the International Institute of Welding (IIW)}},
  location     = {{Seoul (Südkorea)}},
  title        = {{{The Influence of Welding Processes on the Weld Strength of Flame-Retardant Materials}}},
  year         = {{2014}},
}

@inproceedings{27361,
  author       = {{Schöppner, Volker and Leßmann, J.}},
  booktitle    = {{30th International Conference of the Polymer Processing Society (PPS)}},
  location     = {{Cleveland (USA)}},
  title        = {{{Validation of Discrete Element Simulations in the Field of Solids Conveying in Single-screw Extruders}}},
  year         = {{2014}},
}

@inproceedings{27363,
  author       = {{Schöppner, Volker and Böhm, N. and Reinders, F.}},
  booktitle    = {{WAK-Symposium}},
  location     = {{Karlsruhe (Deutschland)}},
  title        = {{{WPC: Compoundierung und Rezepturen}}},
  year         = {{2014}},
}

@inproceedings{22018,
  abstract     = {{Fused Deposition Modeling (FDM) parts are prone to process-related rough and wavy surfaces with stair-stepping effects whenever the parts produced have sloped or rounded geometries. These stair-stepping effects can be reduced by using a smaller slice height, but complete elimination is not possible. In this paper, FDM parts manufactured with the material ABS-M30 are finished using mass finishing methods. The mass finishing is done with a trough vibrator, which is comparatively gentle to the parts in comparison to other mass finishing technologies. The analysis discusses the surface-smoothing effect of finishing time and intensity on various part sizes and build orientations. In addition, the dimensional accuracy of the parts after the finishing process is examined.}},
  author       = {{Fischer, M. and Schöppner, Volker}},
  booktitle    = {{25th Annual International Solid Freeform Fabrication Symposium}},
  pages        = {{923--934}},
  title        = {{{Finishing of ABS-M30 Parts Manufactured with Fused Deposition Modeling with Focus on Dimensional Accuracy}}},
  doi          = {{http://utw10945.utweb.utexas.edu/sites/default/files/2014-073-Fischer.pdf}},
  volume       = {{25}},
  year         = {{2014}},
}

@inproceedings{22030,
  abstract     = {{Parts produced by Fused Deposition Modeling (FDM) tend to have rough and undulating surfaces with staircase effects on rounded and slanting areas of the part. This is due to the characteristics of the process. In many fields of application, high demands are made on the optical quality of the part. An improvement in the surface quality of FDM parts made of Ultem*9085 can be achieved through post-treatment with a mass finishing process. In this paper, FDM specimens are post-treated in a disk finishing unit. Influences of the mass finishing process are analyzed with regard to the dependence of surface quality on the various process parameters and on the finishing medium, grinding time and grinding speed. The finishing efficiency depends on the finishing media and decreases for lower finishing time. For all media a lower disk velocity results a smaller grinding effect, but there are clearly differences between the finishing media. The paper also discusses effects of the grinding process on the mechanical properties of the parts. Especially small part geometries and parts build in z-direction tend to break during the finishing process.}},
  author       = {{Fischer, M. and Schöppner, Volker}},
  booktitle    = {{ANTEC}},
  isbn         = {{978-1-63439-708-7}},
  pages        = {{2331--2336}},
  publisher    = {{SPE: Society of Plastics Engineers}},
  title        = {{{Effects of a mass finishing process on parts produced from Ultem 9085 by Fused Deposition Modeling}}},
  year         = {{2014}},
}

@inproceedings{22021,
  abstract     = {{Additive production techniques have the advantage of manufacturing parts without needing a forming tool. One of the most used additive manufacturing processes is "Fused Deposition Modeling" (FDM) which allows the production of prototypes and end-use parts. Due to the manufacture layer by layer, also complex part geometries can be created in one working step. Furthermore, lightweight parts with specific inner core structures can be manufactured in order to achieve good weightrelated strength properties. In this paper the mechanical behavior of lightweight parts manufactured with the 3D production system Fortus 400mc from Stratasys and the material Polyetherimide (PEI) with the trade name Ultem*9085 is analyzed. The test specimens were built up with different inner structures and building directions. Therefore, test specimens with known lightweight core geometries (e.g. corrugated and honeycomb cores) were designed. A four-point bending test was conducted to analyze the strength properties as well as the weight-related strength properties. Additionally the influence of the structure width, the structure wall thickness and the top layer thickness was analyzed using a honeycomb structure.}},
  author       = {{Bagsik, A. and Josupeit, S. and Schöppner, Volker and Klemp, E.}},
  booktitle    = {{29th International Conference of the Polymer Processing Society}},
  pages        = {{696--701}},
  publisher    = {{American Institute of Physics }},
  title        = {{{Mechanical Analysis of Lightweight Constructions manufactured with Fused Deposition Modeling}}},
  doi          = {{10.1063/1.4873874}},
  volume       = {{29}},
  year         = {{2014}},
}

@inproceedings{22017,
  abstract     = {{Fused Deposition Modeling (FDM) parts are typically subject to process-related rough or wavy surfaces, with stair-stepping effects whenever the parts produced have sloped or rounded part geometries; however, the level of optical quality frequently required demands that parts feature a smooth surface. In this paper, the results of a high-energy finishing process, which uses a disc finishing unit and is designed for parts manufactured with the material Ultem*9085, are presented. The analysis discusses the surface-smoothing effect of various finishing materials with varying geometries, as well as the effect of finishing time and speed. Additionally, the efficiency of the surface treatment has been analyzed specifically at corners, edges and in cavities.}},
  author       = {{Fischer, M. and Schöppner, Volker}},
  booktitle    = {{24th Annual International Solid Freeform Fabrication Symposium}},
  pages        = {{805--815}},
  title        = {{{Some Investigations Regarding the Surface Treatment of Ultem 9085 Parts Manufactured with Fused Deposition Modeling}}},
  doi          = {{http://utw10945.utweb.utexas.edu/Manuscripts/2013/2013-64-Fischer.pdf}},
  volume       = {{24}},
  year         = {{2013}},
}

@inproceedings{22016,
  abstract     = {{Relating to the direct manufacturing of end-use parts the knowledge about the effect of the long-term ageing of Fused Deposition Modeling (FDM) parts is of particular importance. For this, tensile specimens were stored for time periods of up to 52 weeks in two different conditions and the testing was conducted at different temperatures within a temperature range of -60°C to +160°C. Further tests were made after the exposure in multiple media. The parts were built up with the system “Fortus 400mc” from Stratasys with the material Ultem*9085 in two different build directions, the strongest direction X (on its side) and the weakest build direction Z (upright) and with the standard toolpath parameters of the Insight software version 7.0.}},
  author       = {{Bagsik, A. and Schöppner, Volker and Klemp, E.}},
  booktitle    = {{23rd Annual International Solid Freeform Fabrication Symposium}},
  pages        = {{629--640}},
  title        = {{{Long-Term ageing effects on Fused Deposition Modeling Parts manufactured with ULTEM*9085}}},
  doi          = {{http://utw10945.utweb.utexas.edu/Manuscripts/2012/2012-48-Bagsik.pdf}},
  volume       = {{23}},
  year         = {{2012}},
}

@inproceedings{22164,
  abstract     = {{Generative production techniques have the advantage of manufacturing parts via an additive process without needing a forming tool. One of these additive manufacturing technologies is "Fused Deposition Modeling" (FDM). It is one of the most used additive manufacturing processes to produce prototypes and end-use parts. From a 3D-CAD data set, components and assemblies are manufactured out of thermoplastic material layer by layer by means of an additive process. An extrusion head deposits the molten thermoplastic filament to create each layer with a particular tool path. Due to the thermal fusion the material bonds with the layer beneath and solidifies. Thus a permanent bonding of two layers is formed. In this paper the mechanical data of parts, manufactured with the system Fortus 400mc from Stratasys with the material Ultem*9085 are presented. Tensile and flexural tests according to both, the ASTM and the ISO standard, are conducted. Test specimens are generated with the standard parameters of the native software in different build directions. The tests show different strength and strain characteristics that depend on the given structure as a result of the build direction. Furthermore tensile specimens according to the ASTM standard are generated with changed parameters of the native software to increase the mechanical strength properties. The results are compared to injection molded strength properties.}},
  author       = {{Bagsik, A. and Schöppner, Volker and Klemp, E.}},
  booktitle    = {{1st International Conference on Thermo-Mechanically Graded Materials}},
  isbn         = {{9783942267588}},
  pages        = {{129--134}},
  title        = {{{Tensile and Flexural Properties of Fused Deposition Modeling Parts Manufactured with ULTEM*9085}}},
  volume       = {{1}},
  year         = {{2012}},
}

@inproceedings{22024,
  abstract     = {{Generative production techniques have the advantage of manufacturing parts via an additive process without needing a forming tool. One of these additive manufacturing technologies is “Fused Deposition Modeling” (FDM). It is one of the most used additive manufacturing processes to produce prototypes and end-use parts. From a 3D-CAD data set, components and assemblies are manufactured out of thermoplastic material layer by layer by means of an additive process. An extrusion head deposits the molten thermoplastic filament to create each layer with a particular tool path. In this paper the mechanical data of parts, manufactured with the system Fortus 400mc from Stratasys with the material Ultem*9085 are presented. Tensile specimens are generated with the standard parameters as well as with changed parameters of the native software to analyze the influence of these parameters on the mechanical strength properties. The tensile tests show different strength and strain characteristics that depend on the given structure and as a result of the build direction. Furthermore the toolpath parameters have an effect on the strength characteristics and the break behavior. In addition, tensile specimens are tested under the influence of different temperatures and after a thermal cycling. }},
  author       = {{Bagsik, A. and Schöppner, Volker and Klemp, E.}},
  booktitle    = {{5th International Conference on Polymer and Mould Innovations}},
  pages        = {{266--272}},
  publisher    = {{Centre for Polymer and Material Technology, Univ. College, Ghent Univ.}},
  title        = {{{Extensive Analysis of the mechanical strength properties of Fused Deposition Modeling Parts manufactured with ULTEM 9085}}},
  doi          = {{https://www.tib.eu/de/suchen/id/TIBKAT%3A756276616}},
  volume       = {{5}},
  year         = {{2012}},
}

@inproceedings{22029,
  abstract     = {{In this work the influence of the orientation and the toolpath generation of manufactured parts based on the mechanical data are analyzed. Tensile Specimen are generated with the given parameters as well as with changing parameters of the native software based upon the CAD data. The parts then are built up with the “Fortus 400mc” from Stratasys. First tensile tests show different strength and strain characteristics that depend on the given structure and as a result of the build direction. The influence of the parameters was analyzed with a statistic test method by using the software Design Expert.}},
  author       = {{Bagsik, A. and Schöppner, Volker}},
  booktitle    = {{ANTEC}},
  pages        = {{1294--1298}},
  title        = {{{Mechanical Properties of Fused Deposition Modeling Parts Manufactured with ULTEM*9085}}},
  doi          = {{https://www.researchgate.net/profile/Volker_Schoeppner/publication/284341800_Mechanical_properties_of_fused_deposition_modeling_parts_manufactured_with_ULTEMzast9085/links/5c73971b458515831f6cd501/Mechanical-properties-of-fused-deposition-modeling-parts-manufactured-with-ULTEM-zast9085.pdf}},
  year         = {{2011}},
}

@inproceedings{23858,
  abstract     = {{A large proportion of plastics today is compounded, which means the process from refining a raw material to the processable material. For this process compounding extruders are used which mostly involve tightly intermeshing, co-rotating twin screw extruders. These extruders consist of two closely spaced screws which rotate in the same direction and convey the raw material to the screw tip. These screws are surrounded by several barrel modules which heat or cool the material. As the whole design of the machine is modularly arranged the process behavior of a twin screw extruder depends for the main part on the arrangement of the screw and the barrel elements. Until today this arrangement and process optimization is conducted by experienced engineers and with the help of trial-and-error methods. Furthermore, theoretical models are used with which the behavior of the extruder is estimated. As these models are mostly very complex they are only made available with the realization in different software projects. One of the tools is called SIGMA. Within this paper SIGMA is introduced as a software to optimize a twin screw extruder. SIGMA supports the engineer already in the early stages of the extruder arrangement.}},
  author       = {{Kretzschmar, Nils and Schöppner, Volker}},
  booktitle    = {{Proceedings of the 2010 Summer Computer Simulation Conference}},
  keywords     = {{process optimization, polymer engineering, compounding, twin screw extruder, simulation}},
  pages        = {{133–140}},
  publisher    = {{Society for Computer Simulation International}},
  title        = {{{Simulating Tightly Intermeshing, Co-Rotating Twin Screw Extruders with SIGMA}}},
  year         = {{2010}},
}