Energy efficient fibre composites recycling
Sammanfattning: In this project, an investigation will be performed about how to improve thermal properties of recycled composite material. First, a literature study was performed about the potential techniques to improve the heating efficiency of the composites. Heating techniques, fibres and possible fillers were investigated. Secondely, an experimental method was set with the material available. In the laboratory a precedent work was performed on the thermal conductivity of polyamide 12 reinforced with glass fibres. The conductivity of polyamide 12 reinforced with carbon fibres is measured using the same experimental method to compare the thermal conductivity. In theory, carbon fibres have a better thermal conductivity than glass fibres, this was confirmed by the experiments performed. During the recycling of thermoplastic fibre composites the scrap will be grinded. Therefore, the thermal conductivity of small pieces of carbon fibre composites was measured, the thermal conductivity is reduced due to the increase of air fraction and the shortening of the fibres. The thermal conductivity of small pieces of glass fibre composite was investigated in the previous work, by mixing the grinded pieces of carbon fibre composite and the small pieces of the glass fibre composite the effect on the thermal conductivity was investigated. It was noticed that using smaller pieces of grinded material allows to reduce the air fraction between the bigger pieces and increase the thermal conductivity.
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