Simulation Of Flow Field And Device For Continuous Carbon Fiber Airflow Yarn

Continuous carbon fiber reinforced thermoplastic preimpregnation sheet has been widely used in the frontier fields of national defense,aerospace and aviation,automobile and so on due to its excellent performance,especially the ultra-thin preimpregnation sheet.In order to ensure the performance of the product,make the resin fully impregnated,reduce the thickness of the preimpregnated sheet and increase the fiber content,it is necessary to expand the width and thickness of the carbon fiber and expand the gap between the monofilaments before impregnating.At present,the mainstream yarn spreading technology in China is mechanical yarn spreading.This method has great wear on fiber and unsatisfactory yarn spreading effect.In this paper,the continuous carbon fiber thin layer is prepared by the method of airflow yarn spreading and mechanical roll yarn spreading.On the basis of studying the mechanism of continuous fiber airflow yarn spreading,a set of complete airflow yarn spreading device was designed.Combined with the simulation software,the airflow field inside the device was simulated and analyzed,the structural parameters of airflow inlet,are optimized.4.In the process of air show yarn,and the effects of process parameters on the exhibition yarn experiment research,focuses on the air velocity,fiber feed rate,tow tension on the exhibition of the width of the yarn,the results show that when the airflow speed of 12 m/s,fiber feed speed of 2 m/s,fiber tension is 10 g,mechanical roller oscillating frequency is 280 r/min,The average width and thickness of 12K carbon fiber are 26mm and 0.02mm respectively,and the average evenness is 87%,which meets the requirements of ultra-thin preimpregnated sheet for carbon fiber unfolding effect.