PLA Feedstock Filled with Spent Coffee Grounds for New Product Applications with Large-Format Material Extrusion Additive Manufacturing

Journal article

Martina Paramatti^, Alessia Romani*^, Gianluca Pugliese, Marinella Levi
ACS Omega, vol. 9(6), 2024 Feb, pp. 6423–6431

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APA Click to copy
Paramatti^, M., Romani*^, A., Pugliese, G., & Levi, M. (2024). PLA Feedstock Filled with Spent Coffee Grounds for New Product Applications with Large-Format Material Extrusion Additive Manufacturing. ACS Omega, 9(6), 6423–6431. https://doi.org/10.1021/acsomega.3c05669

Chicago/Turabian Click to copy
Paramatti^, Martina, Alessia Romani*^, Gianluca Pugliese, and Marinella Levi. “PLA Feedstock Filled with Spent Coffee Grounds for New Product Applications with Large-Format Material Extrusion Additive Manufacturing.” ACS Omega 9, no. 6 (February 2024): 6423–6431.

MLA Click to copy
Paramatti^, Martina, et al. “PLA Feedstock Filled with Spent Coffee Grounds for New Product Applications with Large-Format Material Extrusion Additive Manufacturing.” ACS Omega, vol. 9, no. 6, Feb. 2024, pp. 6423–31, doi:10.1021/acsomega.3c05669.

BibTeX Click to copy

@article{martina2024a,
  title = {PLA Feedstock Filled with Spent Coffee Grounds for New Product Applications with Large-Format Material Extrusion Additive Manufacturing},
  year = {2024},
  month = feb,
  issue = {6},
  journal = {ACS Omega},
  pages = {6423–6431},
  volume = {9},
  doi = {10.1021/acsomega.3c05669},
  author = {Paramatti^, Martina and Romani*^, Alessia and Pugliese, Gianluca and Levi, Marinella},
  month_numeric = {2}
}

Abstract

Food waste and loss generate significant waste such as spent coffee grounds (SCGs) from coffee consumption. These byproducts can be valorized by following circular economy and bioeconomy principles, e.g., using SCGs in polymer-based composites for 3D printing. Although desktop-size material extrusion additive manufacturing is increasingly adopted for biomass-polymer-based composites, the potential of large-format direct extrusion 3D printing systems remains unexplored. This work investigated the thermal, rheological, and mechanical properties of PLA/SCG composites for applications with a large-format pellet extrusion 3D printer. The formulations exhibit minimal degradation at typical 3D printing temperatures of PLA, i.e., ∼190 °C, and limited effects on crystallinity by increasing the SCG weight percentage. The decrease in viscosity due to SCGs improves the printability and layer adhesion, as confirmed by the tensile test results, such as higher ultimate tensile strength and elongation at break values compared to those of the state-of-the-art values. Using pellet feedstocks contributes to limiting the effects of thermomechanical degradation by reducing raw material processing, i.e., avoiding filament extrusion. Using PLA/SCGs formulations was demonstrated through 3D printed complex parts with nonplanar slicing techniques, including a large-scale furniture product, validating large-format pellet extrusion 3D printers for scaling up the use of biomass-filled polymers. 1

Keywords

3D Printing // Biopolymers // Extrusion // Organic Polymers // Plastics

Media Coverage

Revolutionary Polymers Derived From Food Waste published by AZO Materials (Online news magazine). 2

Resources and links

📑 Full text (publisher version) 3

Paramatti, M., Romani, A., Pugliese, G., and Levi, M. 2024. PLA Feedstock Filled with Spent Coffee Grounds for New Product Applications with Large-Format Material Extrusion Additive Manufacturing. ACS Omega, Vol 9(6), 6423-6431. DOI: 10.1021/acsomega.3c05669 ↩
Craig, M., 2024. Revolutionary Polymers Derived From Food Waste. AZO Materials. Available at: https://www.azom.com/news.aspx?newsID=62557 ↩
Paramatti, M., Romani, A., Pugliese, G., and Levi, M. 2024. PLA Feedstock Filled with Spent Coffee Grounds for New Product Applications with Large-Format Material Extrusion Additive Manufacturing. ACS Omega, Vol 9(6), 6423-6431. DOI: 10.1021/acsomega.3c05669 ↩