| 摘要 |
The present invention has a feature wherein unidirectional yarn sheets (S), in which multiple pieces of yarn are arranged parallel to each other without flexure in one direction, and thermoplastic resin films (F) are alternately stacked one above another, and the thermoplastic resin film (F) is located between the unidirectional yarn sheets (S). Furthermore, the present invention has a feature wherein the unidirectional yarn sheets (S) and the thermoplastic resin films (F) with a degree of crystallinity of 30% or less are integrally coupled by stitching yarn (Y), and the unidirectional yarn sheets (S) adjacent to each other are obliquely stacked with a tilt angle ranging from ±1° to ±90° with respect to the direction in which the multiple pieces of yarn constituting the unidirectional yarn sheets (S) are arranged. In addition, the present invention has a feature wherein the unidirectional yarn sheets (S) are included instead of fabric or multi-axial fabric so that an excellent smoothness can be achieved, thereby making the physical property, such as strength, etc., of a composite material made of the same uniform, and the thermoplastic resin films (F) having a proper degree of crystallinity and a proper thickness are stacked between the unidirectional yarn sheets (S), which makes it possible to enhance efficiency in impregnating the unidirectional yarn sheets (S) with the thermoplastic resin when forming a composite material even in a case where the weight of the stacked material is 200 g/m2 or more. |
