Abstract
Thermoplastic composites have great advantages over thermoses composites in productivity and their propels. However, thermoplastic composites have not been used so widely because of the difficulty in impregnation of their materials. In this study, the unidirectional composites were fabricated under different cooling conditions by using companioned yarn and uncommingled yarn. It was investigated that the bending strength at the longitudinal(0$^{\circ}$) and transverse(90$^{\circ}$) directions, DSC analysis and X-ray dieaction analysis of thermoplastic composites which consisted of polypropylene(PP), nylon6(Ny6) and polyethylene telephtalate(PET) as the matrix fiber and glass fiber as the reinforcement, respectively.