| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a unidirectional reinforcement fiber sheet which has a structure excellent in resin impregnation in VaRTM molding in spite of having a heavy basis weight, has carbon fibers arranged with reduced crimps, and can be produced without using a weaving or knitting machine, or a multiaxial weaving machine. <P>SOLUTION: A fiber reinforcement sheet with a basis weight of 600-1000 g/m<SP POS="POST">2</SP>includes: a plurality of sheet-like objects each obtained by arranging in parallel a plurality of yarns 1 each of which is formed of a plurality of carbon fibers arranged in parallel and has a fineness within a certain range; a plurality of pairs of auxiliary yarns 3; and a plurality of weft yarns 2. The plurality of sheet-like objects are arranged in parallel with spaces between the sheet-like objects adjacent to each other. The weft yarns 2 are arranged in the direction intersecting the sheet-like objects, and the auxiliary yarns 3 are arranged in the spaces. The auxiliary yarns 3 are used as warp yarns to form a leno weave structure with the weft yarns, thereby integrally holding a group of the yarns 1 substantially without bending. <P>COPYRIGHT: (C)2013,JPO&INPIT |
