Novel process routes towards the production of spherical polymer powders for selective laser sintering

Schmidt J, Dechet M, Gomez Bonilla JS, Kloos S, Wirth KE, Peukert W (2019)

Publication Type: Conference contribution

Publication year: 2019

Journal

AIP Conference Proceedings AIP Publishing

Publisher: American Institute of Physics Inc.

Book Volume: 2139

Conference Proceedings Title: AIP Conference Proceedings

Event location: Cancun, MEX

ISBN: 9780735418820

DOI: 10.1063/1.5121697

Abstract

Additive manufacturing processes allow the production of individualized and complex parts without the use of molds or tools. Especially powder and beam-based AM processes like selective laser sintering (SLS) of polymers are promising, although the choice of commercial SLS powders is very limited. To further extend the applications of SLS, new and cheap materials with good processability must be supplied. Within this contribution two innovative methods for production of spherical polymer micro particles for SLS are discussed: The first approach is a process chain applicable to a wide range of polymers consisting of wet grinding in a stirred media mill followed by rounding of the obtained irregularshaped particles in a heated downer reactor and subsequent dry coating of the spherical particles for improvement of powder flowability. It will be outlined for glass-filled PBT systems. The second approach is melt emulsification with subsequent dry coating. In this process a polymer melt is emulsified by elongational and shear stresses in a rotor stator device. The method is exemplified for polypropylene (PP). Both approaches allow for production of spherical polymer micro particles. The effect of flowability, shape and bulk density on the powders' processabilities in SLS is assessed.

Authors with CRIS profile

Jochen Schmidt Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Maximilian Dechet Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Juan Sebastian Gomez Bonilla Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Stephanie Kloos Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Karl-Ernst Wirth Technische Fakultät Wolfgang Peukert Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik

Related research project(s)

Modification and structuring of powders by gas phase processes (A2) (SFB 814 (A2)) CRC 814 - Additive Manufacturing (SFB 814) July 1, 2011 - June 30, 2023 Production of functional polymer particles via liquid-based top-down processes (A1) (SFB 814 (A1)) CRC 814 - Additive Manufacturing (SFB 814) July 1, 2011 - June 30, 2023

How to cite

APA:

Schmidt, J., Dechet, M., Gomez Bonilla, J.S., Kloos, S., Wirth, K.-E., & Peukert, W. (2019). Novel process routes towards the production of spherical polymer powders for selective laser sintering. In Octavio Manero, Fausto Calderas (Eds.), AIP Conference Proceedings. Cancun, MEX: American Institute of Physics Inc..

MLA:

Schmidt, Jochen, et al. "Novel process routes towards the production of spherical polymer powders for selective laser sintering." Proceedings of the 33rd International Conference of the Polymer Processing Society, PPS 2017, Cancun, MEX Ed. Octavio Manero, Fausto Calderas, American Institute of Physics Inc., 2019.

BibTeX: Download