Vortrag (20 Min., 5 Min. Diskussion, 5 Min. Raumwechsel)
Composites produced by the use of film-stacking or hybrid yarns cannot achieve an optimal impregnation of reinforcement fibres with the matrix polymer. This stens from the high melt viscosity of thermoplastics, which prevents a uniform wetting of the reinforcement fibres. Leaving some fibres unconnected to the matrix. This leads to composite with a lower strength than theoretically possible. The aim of the presented development is the coating of glass filaments in the glass fibre nozzle drawing process to achieve a homogenous distribution of glass fibres and matrix in the final composite. The approach uses Polyamid 12 (PA 12) in the form of powder which is applied to the glass filaments and melted by infrared heating. The resulting bicomponent fibres are winded subsequently. This development will allow the homogenous distribution of fibres and the matrix in a thermoplastic composite allowing a higher fibre volume content leading to improved mechanical properties. Through the coating of the glass filaments with PA 12, a covering sheath could be achieved. Further research will focus on an improved homogeneity by reducing the agglomeration of PA 12, using dried PA 12 and enhancing the overall nozzle setup, as well as the processing to finished parts.