Abstract:

Using carbon fibre tows as raw materials, carbon fibre bulk yarns were producedby the airflow dispersion method for the first time. The breaking strength,  strength irregularity,  yarn irregularity and  hairiness index of the carbon fibre bulk yarn were used as evaluation indices, and  preparation technology for carbon fibre bulk yarn was optimized using the orthogonal experimental method. Subsequently the disordered structure of  homemade carbon fibre bulk yarn, the ability to fix the resin, and the surface contact angle were investigated. Finally  infrared spectral analysis of the carbon fibre bulk yarn was carried out. Results show that the best preparation technology for carbon fibre bulk yarn is as follows: nozzle air pressure 0.45 MPa, spinning speed 150 m/min, and nozzle diameter 2.2 mm. The degree of disorder of fibres of  T700 carbon fibre bulk yarn fibre is 18.70%~25.60%; as the degree of disorder of  carbon fibre bulk yarn increases, the ability to fix the resin is enhanced. The process of carbon fibre tows producing bulk yarns is a physical one.