Project title:
ECO-FRIENDLY COMPOSITES MADE BY 3D PRINTING TECHNIQUES USED FOR SOUNDPROOFING PANELS
ACRONYM: ECO_3D_SOUND
Programme: PN-III-P1-1.1-TE-2021
Contract no.: TE 75 from 13/05/2022
Human Resources Research Projects for Young Independent Teams
The contracting authority: Executive Agency for Higher Education, Research, Development and Innovation Funding (UEFISCDI), www.uefiscdi.gov.ro
Period: 15/05/2022 ÷ 14/05/2024
Budget: 450000 RON
Host Institution: Transilvania University of Brasov, https://www.unitbv.ro/en/
Project Leader: CS II PhD. eng. Mihai Alin POP
Executive summary of project
Within the project, a series of activities and results were proposed and estimated according to the financing contract TE 75 ⁄ 2022, for 24 months.
After going through all the stages and activities within the project, it was possible to successfully complete them in a proportion of 100% and in terms of the dissemination of the results, exceeding the estimated number of both scientific papers in ISI journals (Q1 or Q2) and presentations at international conferences.
Within the project, a number of six influencing factors were determined, factors that directly influence the sound-absorbing properties in the case of 3D printed panels and a number of four factors in the case of composite sound-absorbing panels obtained from recycled materials (cellulose + beeswax + fir resin + Equisetum arvense/horsetail).
In the case of panels obtained directly from CAD models (3D printing), a number of nine panels were highlighted with all the obtaining conditions (void configuration, percentage of voids in the volume, material density, 3D printing characteristics) with a sound absorption coefficient α = 0.95 ÷ 0.99.
In order to obtain sound-absorbing panels made of eco-composites, two moulds were designed and obtained as follows: Mold I – from polymer materials for obtaining cellulose cores and Mold II – from metal for obtaining sound-absorbing panels with a cellulose core and reinforced with a mixture of wax bees / fir resin / horsetail powder.
The best results obtained are precisely in the case of these eco-composite panels, panels that are the subject of the national patent application a 2024 00099 and the international patent application PCT/RO2024/000011, with a sound absorption coefficient α = 0.99.