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Increasing flowability and bulk density of PE-HD powders by a dry particle coating process and impact on LBM processes

  • Purpose – The purpose of this paper is to demonstrate the processability of cohesive PE-HD particles in laser beam melting processes (LBM) of polymers. Furthermore, we present a characterization method for polymer particles, which can predict the quality of the powder deposition via LBM processes. Design/methodology/approach – This study focuses on the application of dry particle coating processes to increase flowability and bulk density of PE-HD particles. Both has been measured and afterwards validated via powder deposition of PE-HD particles in a LBM machine. Findings – For efficient coating in a dry particle coating process, the PE-HD particles and the attached nanoparticles need to show similar surface chemistry, i.e. both need to behave either hydrophobic or hydrophilic. It is demonstrated that dry particle coating is appropriate to enhance flowability and bulk density of PE-HD particles and hence considerably improves LBM processes and the resulting product quality. Originality/value – At present, in LBM processes mainly polyamide (PA), 12 particles are used, which are so far quite expensive in comparison to, for example, PE-HD particles. This work provides a unique and versatile method for nanoparticulate surface modification which may be applied to a wide variety of materials. After the coating, the particles are applicable for the LBM process. Our results provide a correlation between flowability and bulk density and the resulting product quality.

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Metadaten
Author:Christina Blümel, Marius Sachs, Tobias LaumerORCiDGND, Bettina Winzer, Jochen SchmidtORCiD, Michael Schmidt, Wolfgang PeukertORCiDGND, Karl-Ernst WirthGND
DOI:https://doi.org/10.1108/RPJ-07-2013-0074
ISSN:1758-7670
ISSN:1355-2546
Parent Title (English):Rapid Prototyping Journal
Publisher:Emerald
Document Type:Article
Language:English
Year of first Publication:2015
Release Date:2022/11/24
Tag:Bulk density; Dry particle coating; Flowability; Hydrophilic; Hydrophobic; Polymers
Volume:21
Issue:6
First Page:697
Last Page:704
Institutes:Fakultät Maschinenbau
Fakultät Maschinenbau / Labor Additive and Intelligent Manufacturing for Sustainability (AIMS)
Begutachtungsstatus:peer-reviewed
Publication:Externe Publikationen
research focus:Produktion und Systeme
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG