@article{43046,
  abstract     = {{In the laser sintering technology, the semi-crystalline polymer material is exposed to elevated temperatures during processing, which leads to serious material ageing for most materials. This has already been investigated intensively by various authors. However, the ageing of the material at ambient temperatures during shelf life has not been the focus so far. The need to analyse the shelf life can be derived from an ecological and economic point of view. This work is focusing on the shelf life of PA2200 (PA12). To reduce the potential influences of powder production fluctuations, two different powder batches stored for 5.5 years and 6.5 years are investigated and compared to a reference powder produced 0.5 years before these investigations. Multiple powder analyses and part characterisations have been performed. A significant yellowing and molecular chain length reduction can be derived from the measurement results. Whereas the influence on mechanical part performance was minor, the parts built with the stored powders are more yellowish. As it is most likely that this is due to the consumption of polyamide stabilisers, it can be assumed that these parts will be subject to significantly faster ageing. Therefore, it is still not recommended to use the stored powders for critical parts or light intense and humid environments.}},
  author       = {{Klippstein, Sven Helge and Kletetzka, Ivo and Sural, Ilknur and Schmid, Hans-Joachim}},
  journal      = {{The International Journal of Advanced Manufacturing Technology }},
  keywords     = {{Selective laser sintering, Shelf life, Polyamide 12, powder, PA2200, material ageing}},
  publisher    = {{Springer}},
  title        = {{{Influence of a prolonged shelf time on PA12 laser sintering powder and resulting part properties}}},
  doi          = {{https://doi.org/10.1007/s00170-023-11243-1}},
  year         = {{2023}},
}

@inbook{46870,
  author       = {{Menge, Dennis and Milaege, Dennis and Hoyer, Kay-Peter and Schmid, Hans-Joachim and Schaper, Mirko}},
  booktitle    = {{Climate Protection, Resource Efficiency, and Sustainable Engineering}},
  editor       = {{Horwath, Illona and Schweizer, Swetlana}},
  isbn         = {{9783837663778}},
  issn         = {{2703-1543}},
  publisher    = {{transcript Verlag}},
  title        = {{{Case Study IV: Individualized Medical Technology using Additive Manufacturing}}},
  doi          = {{10.14361/9783839463772-007}},
  year         = {{2023}},
}

@inproceedings{44102,
  author       = {{Neukötter, Moritz and Jesinghausen, Steffen and Schmid, Hans-Joachim}},
  location     = {{Athens}},
  title        = {{{Instabilities of Polymer Melt Suspensions under Uniaxial Extension (Poster)}}},
  year         = {{2023}},
}

@inproceedings{51727,
  author       = {{Beimdiek, Janis and Schmid, Hans-Joachim}},
  location     = {{Nürnberg}},
  publisher    = {{VDI Verlag}},
  title        = {{{Entrained flow SCR using an in-situ synthesis of catalyst particles for a combined flue gas cleaning system}}},
  year         = {{2023}},
}

@inproceedings{51726,
  author       = {{Beimdiek, Janis and Schmid, Hans-Joachim}},
  location     = {{Paderborn}},
  title        = {{{Neuartige Flugstrom SCR an online synthetisierten, nanoskaligen Katalysatorpartikeln in einem kombinierten Gasreinigungsprozess (Poster)}}},
  year         = {{2023}},
}

@inproceedings{51147,
  author       = {{Massopo, Orlando and Tischendorf, Ricardo and Schmid, Hans-Joachim and Fröde, Fabian and Grenga, Temistocle and Pitsch, Heinz and Bieber, Malte and Reddemann, Manuel and Kneer, Reinhold}},
  keywords     = {{Flame Stability, Particle Sample Extraction, SMPS, Impurities}},
  location     = {{Nürnberg}},
  publisher    = {{International Congress of Particle Technology}},
  title        = {{{Influence of atomization on the particle formation in spray flame pyrolysis (Presentation)}}},
  year         = {{2023}},
}

@inproceedings{51142,
  author       = {{Massopo, Orlando and Tischendorf, Ricardo and Schmid, Hans-Joachim and Fröde, Fabian and Pitsch, Heinz and Reddemann, Manuel and Grenga, Temistocle and Kneer, Reinhold}},
  keywords     = {{SpraySyn, Flammenspraypyrolyse, Maghemite Nanopartikel, Gas to particle-Syntheseweg, Probennahme, Verunreinigung}},
  location     = {{Paderborn}},
  publisher    = {{Jahrestreffen der DECHEMA-Fachgruppen Aerosoltechnik, Gasreinigung, Mehrphasenströmung und Partikelmesstechnik}},
  title        = {{{Einfluss der Zerstäubung auf diePartikelbildung bei der Sprayflammenpyrolyse (Vortrag)}}},
  year         = {{2023}},
}

@article{54632,
  author       = {{Bentrup, Leon Alexander and Gräßer, Melanie  and Temmen, Katrin and Schmid, Hans-Joachim}},
  journal      = {{die hochschullehre}},
  number       = {{9}},
  publisher    = {{wbv Publikation}},
  title        = {{{Entwicklung eines neuen Konzeptes zur Vermittlung von Lerntechniken und Selbstlernkompetenzen für Studierende des Maschinenbaus an der Universität Paderborn}}},
  doi          = {{10.3278/HSL2310W}},
  year         = {{2023}},
}

@inproceedings{30220,
  abstract     = {{In this work, the influences of spherical fillers on the processing properties and the resulting mechanical properties of laser sintered components are investigated. For this purpose, micro glass spheres, hollow glass bubbles and mineral spheres are dry blended to the matrix polymers polyamide 613 and polypropylene with a filling ratio of 20 and 40 vol%. First, relevant properties of the blends, such as powder flowability, thermal behavior and melt viscosity, are investigated. Based on the results, processing parameters are then developed for the LS process and the mechanical properties of the components are investigated. The aim is to be able to tailor the mechanical properties of LS components by adding fillers and thus to create new application areas for additively manufactured components. }},
  author       = {{Kletetzka, Ivo and Gawlikowicz, Roland and Schmid, Hans-Joachim}},
  booktitle    = {{Proceedings of the 33th Annual International Solid Freeform Fabrication Symposium}},
  location     = {{Austin}},
  publisher    = {{Laboratory for Freeform Fabrication and University of Texas}},
  title        = {{{Effects of spherical fillers on the processability and mechanical properties of PA613 and PP-based LS dry blends}}},
  doi          = {{http://dx.doi.org/10.26153/tsw/44558}},
  volume       = {{33}},
  year         = {{2022}},
}

@inproceedings{32874,
  author       = {{Kletetzka, Ivo and Klippstein, Sven Helge and Schmid, Hans-Joachim}},
  booktitle    = {{Proceedings of the 33th Annual International Solid Freeform Fabrication Symposium}},
  location     = {{Austin}},
  publisher    = {{Laboratory for Freeform Fabrication and University of Texas}},
  title        = {{{Shelf Life of Polyamide 12 (PA2200) Laser Sintering Powder}}},
  doi          = {{http://dx.doi.org/10.26153/tsw/44555}},
  volume       = {{33}},
  year         = {{2022}},
}

@article{31035,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Further innovation in the field of selective laser sintering (SLS) is strongly connected to the availability of new materials since the market is dominated by polyamide 12 (&gt;90%). The aim of this publication is to develop a descriptive model for the droplet formation process in a Filament Extension Atomizer to predict the applicability to exploit further polymers for the SLS process. The feasibility was tested, investigated and characterized using a “Dripping out of a nozzle” setup for uniaxial extension. The droplet formation process was then observed via high-speed camera imaging and classified for certain parameters. The experiments were carried out using semi-diluted polyethylene oxide (600–4000 kg/mol), glycerol and water solutions as model fluids. Driven by the Plateau-Rayleigh instability, different types of spherical droplets were observed and various droplet formation mechanisms demonstrated and analyzed. Based on the experimental results, a predictive model is derived to describe various essential parameters.</jats:p>}},
  author       = {{Neukötter, Moritz and Jesinghausen, Steffen and Schmid, Hans-Joachim}},
  issn         = {{0035-4511}},
  journal      = {{Rheologica Acta}},
  keywords     = {{Rheology, SLS, Lasersintering, exensional rheology}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Model droplet formation in extensional filament stretching within a Filament Extension Atomizer}}},
  doi          = {{10.1007/s00397-022-01339-y}},
  year         = {{2022}},
}

@inproceedings{37424,
  author       = {{Beimdiek, Janis and Schmid, Hans-Joachim}},
  keywords     = {{clean air, harmful gas removal, denitrification, SCR, catalytic filtration, nanoparticles, flame-synthesis}},
  location     = {{Bochum}},
  title        = {{{A combined flue gas cleaning system with a novel entrained flow SCR using an online synthesized catalyst (Poster)}}},
  year         = {{2022}},
}

@article{35729,
  author       = {{Rüther, Moritz Johannes and Klippstein, Sven Helge and Ponusamy, SathishKumar and Jesinghausen, Steffen and Schmid, Hans-Joachim}},
  journal      = {{Werkstoffe}},
  pages        = {{18 -- 19}},
  publisher    = {{HW-Verlag}},
  title        = {{{Innovative Werkstoffherstellung für das Polymer Laser Sintern – Teil 2}}},
  volume       = {{6}},
  year         = {{2022}},
}

@article{35724,
  author       = {{Rüther, Moritz Johannes and Klippstein, Sven Helge and Ponusamy, SathishKumar and Jesinghausen, Steffen and Schmid, Hans-Joachim}},
  journal      = {{Werkstoffe}},
  pages        = {{28--29}},
  publisher    = {{HW-Verlag}},
  title        = {{{Innovative Werkstoffherstellung für das Polymer Laser Sintern – Teil 1}}},
  volume       = {{5}},
  year         = {{2022}},
}

@inproceedings{37432,
  author       = {{Beimdiek, Janis and Schmid, Hans-Joachim}},
  keywords     = {{clean air, harmful gas removal, denitrification, SCR, catalytic filtration, nanoparticles, flame-synthesis}},
  location     = {{San Diego}},
  title        = {{{Novel entrained flow SCR using online synthesized catalyst particles (Poster)}}},
  year         = {{2022}},
}

@inproceedings{41160,
  author       = {{Neukötter, Moritz and Jesinghausen, Steffen and Schmid, Hans-Joachim}},
  location     = {{Digital}},
  title        = {{{Triggering instabilities of polymer solution suspensions under uniaxial extension  (Presentation)}}},
  year         = {{2022}},
}

@inproceedings{41158,
  author       = {{Neukötter, Moritz and Jesinghausen, Steffen and Schmid, Hans-Joachim}},
  location     = {{Sevilla}},
  title        = {{{Instability analysis of suspensions with a polymer solution matrix (Presentation)}}},
  year         = {{2022}},
}

@inproceedings{33695,
  author       = {{Rüther, Moritz Johannes and Klippstein, Sven Helge and Schmid, Hans-Joachim}},
  editor       = {{Rüther, Moritz Johannes and Klippstein, Sven Helge and Schmid, Hans-Joachim}},
  location     = {{Madrid}},
  title        = {{{Flowability of polymer powders at elevated temperatures for additive manufacturing}}},
  year         = {{2022}},
}

@inproceedings{43238,
  author       = {{Rüther, Torben and Jesinghausen, Steffen and Schmid, Hans-Joachim}},
  keywords     = {{Couette, Rheology, Correction}},
  location     = {{Sevilla}},
  title        = {{{A novel correction method for the shear rate in a couette rheometer (Vortrag)}}},
  year         = {{2022}},
}

@inproceedings{43243,
  author       = {{Rüther, Torben and Schmid, Hans-Joachim}},
  location     = {{Madrid}},
  title        = {{{Multidimensional particle characterization: Centrifugal Differential Mobility Analyzer (Poster)}}},
  year         = {{2022}},
}