The thermoplastic resin is difficult to be impregnated into the reinforced fiber because the resin is a polymer and its melt viscosity is high. Commingled yarn has been developed in order to overcome the difficulties that are experienced when thermoplastic materials are impregnated to reinforce composite materials. Tensile and bending properties of thermoplastic braid composites were discussed. The middle-end-yarn and axial yarn were used to raise strength of thermoplastic braid composites. Tensile properties of thermoplastic braid composites were almost saturated from the molding pressure of 2.0MPa, however, the bending properties were increased along with the molding pressure. The tensile strength of the slow cooling type in double wrapped spun yarn(DSY) thermoplastic braid composites was higher than that of the rapid cooling type.
