Experimental Investigations of the Influence of Spent Coffee Grounds Content on PLA Based Composite for 3D Printing

Oumaima  Boughanmi; Lamis  Allegue; Haykel  Marouani; Ahmed  Koubaa

doi:10.6000/1929-5995.2024.13.23

Authors

Oumaima Boughanmi Mechanical Engineering Laboratory, National Engineering School of Monastir, University of Monastir, Monastir, Tunisia and School of Engineering, University of Québec in Abitibi-Témiscamingue (UQAT), Rouyn-Noranda, Québec J9X 5E4, Canada
Lamis Allegue Mechanical Engineering Laboratory, National Engineering School of Monastir, University of Monastir, Monastir, Tunisia
Haykel Marouani Mechanical Engineering Laboratory, National Engineering School of Monastir, University of Monastir, Monastir, Tunisia
Ahmed Koubaa School of Engineering, University of Québec in Abitibi-Témiscamingue (UQAT), Rouyn-Noranda, Québec J9X 5E4, Canada

DOI:

https://doi.org/10.6000/1929-5995.2024.13.23

Keywords:

PLA, Spent coffee grounds, Biocomposite, Filament manufacturing, Additive manufacturing

Abstract

Nowadays Fused Deposition Modeling, a widely utilized additive manufacturing technology, is significantly transforming as modern production processes. Beyond basic uses to it role in sustainability, Fused Deposition Modeling offers processing potential for implanting circular economy by reducing virgin materials consumption and enhance the integration of waste food for sustainable 3D printing. This research paper investigated the production of new composite materials based on spent coffee grounds. In addition, PLA and SCG at various contents (0, 3, 5, 10, and 15 wt%) were dried and premixed, then processed into PLA/SCG composite pellets using twin-screw extrusion. These pellets were successfully converted into filaments and subsequently used for 3D printing. The effect of spent coffee grounds in PLA composites was investigated via physical and mechanical analysis of 3D printed samples. Regarding density measurements, results revealed that adding up to 5 wt% of spent coffee grounds increased the density while further additions led to a decrease which due to the printing parameters such as extrusion temperature and nozzle diameter. Considering the mechanical properties, the Young’s modulus increased once the spent coffee grounds content reached 3 wt% and then decreased. In the other hand, there was no enhancement in tensile strength and elongation at break which corroborating with density measurements. This mainly contributed to the changes in mechanical properties caused by printing parameters. This study demonstrates that coffee waste can be used as a filler in environmentally friendly composites for 3D printing, with a maximum SCG content of 15 wt%. This approach not only promotes the reuse of coffee waste but also reduces the cost of traditional PLA filaments.

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