Woven carbon fiber fabric, fiber reinforced plastic molding obtained by using woven fabric, and production method of molding

Abstract

A woven carbon fiber fabric, characterized in that many carbon fiber yarns respectively comprising about 40,000 to about 400,000 carbon filaments and having filament interlacements between the respective filaments are arranged. It is preferable that the hook drop value of the carbon fiber yarns is in a range of about 2 to about 30 cm and the fineness of each of the carbon fiber yarns is in a range of about 25,000 to about 350,000 deniers. It is preferable that the bulk density of the woven carbon fiber fabric is less than about 0.65 g / cm<3>, and that the areal unit weight of the carbon fibers is in a range of about 400 to about 700 g / m<2>.

Description

technical field [0001] The invention relates to a carbon fiber fabric made of tow-like thick carbon fiber strands, a fiber reinforced plastic product using the carbon fiber fabric, and a manufacturing method of the plastic product. In more detail, the carbon fiber strand is composed of about 40,000 to 400,000 carbon tows. Background technique [0002] Carbon fiber has a small specific gravity, high tensile strength, and high tensile elasticity. Carbon Fiber Reinforced Plastic (CFRP), which is formed by fixing carbon fibers with resin, is a remarkable composite material with high strength and elasticity. [0003] In conventional CFRP, thin carbon fiber strands composed of 3,000 carbon filaments are used, wherein the thin carbon fiber strands are arranged in the warp and weft directions, and the carbon fiber mesh of the thin two-dimensional fabric used is about 200 to 200. 400g / m 2 In the range. In the past, CFRP was manufactured by laminating multiple pieces of semi-cured...

AI Technical Summary

Problems solved by technology

However, it cannot be practical due to the following problems

That is (f) in order to make a two-dimensional fabric in which carbon fiber strands are arranged in the warp and weft directions, although a fabric with a large carbon fiber mesh is obtained, because the warp direction carbon fiber strands and the weft direction carbon fiber strands are interlaced, The carbon fiber strands have large bends, and when forming CFRP, the stress concentration on the carbon fiber strands results in a decrease in strength and elasticity.

In addition, (g) In the fabric in which the carbon fiber strands are arranged in one direction, although there is no problem of strength reduction due to curling, since the carbon fiber strands are arranged in one direction, the fiber density will not increase when the carbon fiber mesh size of the fabric becomes larger. It becomes significantly larger, and the gap between adjacent filaments becomes smaller. In forming methods such as resin conduction molding or vacuum bag molding, the flow of resin between filaments becomes poor, and it takes time to inject resin, resulting in resin impregnation of carbon fiber fabrics. Variation problem

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