In this work, nonwoven fabrics made from carbon fibers (CFs) and polypropylene (PP) fibers were manufactured through a carding process and a cross-laying process and reinforced by either a needle punching method or a thermobonding method. The effects of the carding parameters (adding oil, increasing the gauge and decelerating the speed) and reinforcement method (needle punching method or thermobonding method) on the anisotropic mechanical properties of hot-pressed CF/PP composites were investigated. Additionally, the length, distribution and orientation of carbon fibers in the hot-pressed composites were studied. The carbon fibers were oriented by the carding method, and the composites exhibited anisotropic properties. Moreover, the fiber distribution results indicated that increasing the gauge and decelerating the speed had a slightly negative influence on the distribution of carbon fibers and that the cross-laying process led to a uniform distribution of fibers. Furthermore, adjusting the carding parameters and reinforcement method could reduce the damage sustained by carbon fibers during manufacturing and subsequently improve the mechanical properties of the CF/PP composites in the transverse direction (TD).

在这项工作中，由碳纤维（CFs）和聚丙烯（PP）纤维制成的无纺布是通过梳理工艺和交叉铺设工艺制造的，并通过针刺法或热粘合法进行增强。研究了梳理参数（加油，增加规格和降低速度）和补强方法（针刺方法或热粘合方法）对热压CF / PP复合材料各向异性力学性能的影响。另外，研究了热压复合材料中碳纤维的长度，分布和取向。通过梳理法使碳纤维取向，并且复合材料表现出各向异性。此外，纤维分布结果表明，增加规格和降低速度对碳纤维的分布有轻微的负面影响，并且交叉铺设过程导致碳纤维的分布均匀。此外，调整梳理参数和增强方法可以减少碳纤维在制造过程中遭受的损坏，并随后改善CF / PP复合材料在横向（TD）上的机械性能。