ESTiG - Artigos em Proceedings Não Indexados à WoS/Scopus
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- Extraction of natural fibers for the manufacture of 3D filaments by FDM material extrusionPublication . Stein, Felipe Y.M.; Rocha, João; Santos, Jorge; Ribeiro, J.E.; Deusdado, Leonel; Rocha, CatarinaThe study aimed to extract hemp fibers for the NaturFab project, in order to mechanically strengthen PLA in filaments for 3D printing. In order to find the best extraction method, several chemical treatments were carried out to separate the fibers from the plant, using solutions of 2 g/l of sodium hydroxide (NaOH) + 2 g/l of sodium carbonate (NaCO₃) and another solution of 6% NaOH, both at 80 ºC. After obtaining the first fiber sample, tensile tests were carried out to compare the strength of the hemp fibers with those of commercial flax. Hemp showed inferior performance compared to flax fibers, with a more fragile behavior after treatment with 6% NaOH. However, a solution of NaOH and NaCO₃ with polyglycolic detergent facilitated extraction and improved fiber strength, but further tests should be carried out to verify its effectiveness.