| 摘要 |
<p>PROBLEM TO BE SOLVED: To achieve reduction of a resin accumulation amount in a root part of a sewing thread folded in a loop form and improvement of the fiber volume content at the same time by using a fiber structure formed by binding an at least two-axis oriented laminate fiber layer with a sewing thread and a fastening thread.SOLUTION: A three-dimensional fiber structure 10 serving as a reinforcing base material for three-dimensional fiber-reinforced composite materials is formed by binding two-axis oriented laminate fiber layers 12 composed of in-plane thread layers 11 laminated by means of a sewing thread 13 and a fastening thread 14. The sewing thread 13 includes a folding insertion part 13a which is engaged with the fastening thread arranged on one outermost layer of the laminate fiber layers 12 so as to be folded in a loop form and inserted into the laminate fiber layers and an opposite fastening thread-side arrangement part 13b which is arranged outside the surface of the laminate fiber layers opposite to the surface where the fastening thread are arranged. In the root part 16 of the folded insertion part 13a, an inlet part 13c in the direction toward the fastening thread and an outlet part 13d in the direction of being engaged with the fastening thread and folded are bent in the same direction.</p> |
