Manufacturing of glass fibre/PBT-SpinCOM yarns for innovative composite processing
Presentation held at 18th European Conference on Composite Materials, ECCM 2018, 25-28 June 2018, Athens
Herstellung von Glasfaser/PBT-Hybridgarn für innovative Verbundverarbeitung
The development of fibre-reinforced thermoplastics was strongly proceeding during the last years because they offer great advantages regarding short cycle capabilities, impact resistance, toughness and recyclability. However, fibre impregnation is challenging due to the high melt viscosity of the thermoplastic matrix. Commingled yarns provide a promising routine to introduce the polymer in forms of filaments into the composite structure resulting in very short impregnation paths. In our previous work we showed the manufacturing of glass fibre/SpinCOM yarns which are based on the principle of homogeneously distribution of continuous matrix filaments and reinforcing glass filaments during melt spinning. Recently, thermoplastics with a wide application field such as polypropylene (PP), polyamide 6.6 (PA 6.6) and polylactic acid (PLA) have been processed to SpinCOM yarns using different sizings in the spinning process that determine the mechanical performance of the thermoplastic composites. In the current work we present the processing of SpinCOM yarns using polybutylene terephthalate (PBT) as thermoplastic polymer in combination with E-glass fibres (GF) and different sizing formulations with the aim to achieve high mechanical performance by an appropriate fibre-matrix-interaction. Furthermore, the glass fibre/PBT-SpinCOM yarns are used in an innovative manufacturing technology for thermoplastic composites including the processing of textile preforms with a variable-axial, load adapted fibre design by Tailored Fibre Placement (TFP). These preforms are consolidated in a low energy and resource consuming process using novel light and low cost forming tools produced by incremental sheet metal forming technology.