直接预浸法制备预浸纱的展纱宽度研究

RESEARCH ON THE SPREAD WIDTH OF FIBER BUNDLE DURING THE PREPARATION OF PREPREG BY DIRECT IMPREGNATON METHOD

在直接预浸法制备自动铺丝预浸纱过程中,展纱宽度是影响预浸纱质量的一个关键因素。借助高速数字图像传感器,研究了展纱机构中,纤维束在错位排列的展纱辊/展纱杆上的展开规律和机理。研究结果表明,展纱杆对纤维束的展开作用明显优于展纱辊,纤维张力的增大、纤维束在展纱杆上包角的增大均有利于纤维束的展开;当纤维牵引速率较低时,纤维束的展开宽度随速率的增大而增大;纤维张力利于纤维束的展开,但是过大的张力会使纤维束展开不稳定,宽度波动较大,且易出现劈裂和纤维损伤的缺陷。该研究结果为自动铺丝预浸纱制备工艺提供了指导。

The spread width of fiber bundle is a key factor which influences the quality of prepreg for AFP （ Au- tomated Fiber Placement） during the manufacturing process by direct impregnation method. With the help of high- speed digital image sensor, the spreading process of the fiber bundle by the rods or rollers in zig-zag fashion under different processing parameter was analyzed. The results indicate that the rod has much stronger effect on spreading fiber bundle than the roller. By increasing the fiber tension or wrap angle as well as decreasing the distance between the adjacent rod and roller, the fiber bundle can be spread wider. Furthermore, the spread width of the fiber bundle increases when the fiber operation speed is low. However, the excessive fiber tension will lead to an unstable sprea- ding process, which could cause the fiber bundle separating and fiber breaking. The results provide guidance on the manufacturing process of the prepreg for AFP.