| 摘要 |
PROBLEM TO BE SOLVED: To increase the quantity of reinforcing fibers per one sheet and to improve resin-impregnation properties by laying sheet base material layers in which reinforcing fiber threads are arranged in parallel in the sheet length direction to overlap each other so that the reinforcing fiber direction is the same and integrating the adjoining layers. SOLUTION: For example, in a multilayer reinforcing fiber sheet 1, two layers of the base material 31 of the first layer in which numbers of fiber reinforced thread stripes 2 are arranged in parallel in the sheet length direction and the base material 32 of the second layer are laid to overlap each other so that the reinforcing fiber direction is the same. The base material 31 and the base material 32 are integrated with each other by an integration means such as weaving organization and adhesion. In this process, the volume of the reinforcing fibers per one square meter of one layer of the base material constituting the sheet 1 is made 100-350 cm3 from the impregnation properties and workability of a resin. Moreover, when the bulk density of the sheet 1 (the volume of the sheet/the volume of the reinforcing fibers) is made 220-300%, resin-impregnation properties can be improved.
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