| 摘要 |
<p>An opened yarn sheet, an opened yarn fabric and a fiber reinforced composite material which allow the improvement in characteristics of impregnation with a matrix and the reduction of void are provided. The opened yarn sheet is characterized in that it is composed of yarns which are opened by untying filaments constituting a multifilament in the direction of width; a plurality of fiber bundles (1) composed of such opened yarns are arranged in one direction with no clearance between them; every opened yarn used has the same METSUKE; a plurality of opened yarns placed in parallel are caused to stand in a row and have a single-piece structure to form an opened yarn sheet (10); and the relationship between METSUKE Wa (g/m2) of an opened yarn sheet and METSUKE Fy (g/m) of an opened yarn satisfies the equation: Wa = Kc.Fy 1/2 wherein Kc represents a constant (12.0 to 120.0).</p> |
