Stacked material for forming composite material

Abstract

The invention discloses a stacked material for forming a composite material. 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 DEG to +-90 DEG 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.

Description

technical field [0001] The present invention relates to a laminate ("laminate") for forming a composite material, and more particularly, to a laminate for forming a composite material comprising sheets of unidirectional yarns ( unidirectional yarn sheets), and since the thermoplastic resin film is located between the unidirectional yarn sheets, even if the laminate has a high weight, the thermoplastic resin can be smoothly impregnated into the unidirectional yarn sheets during the process of forming the composite , and thus the laminate has improved physical properties, such as strength during the formation of a composite material. [0002] Hereinafter, the term "unidirectional yarn sheet" refers to a yarn sheet in which yarns are arranged parallel to each other in one direction without bending or crossing. Background technique [0003] Composite materials are generally formed by impregnating fibrous structures such as fabrics with resins and curing them (heat curing), and ...

AI Technical Summary

Problems solved by technology

However, since thermoplastic resins have a higher viscosity than thermosetting resins, if the continuous and reinforcing fibers have a high basis weight, it is difficult to impregnate the fabric structure with the resin, thus reducing the uniformity and physical properties of the composite

Most of these problems are caused by uneven impregnation of the thermoplastic resin due to the high melting point

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