Patent ID: 8821670

Claim:
A method of manufacturing an advanced grid structure, comprising: preparing a forming die made of a metal, in which a lattice-shaped groove is formed in three directions; laminating a first tape prepreg group, a second tape prepreg group, and a third tape prepreg group repeatedly in the stated order on the forming die so as to provide crossing regions, in each of which two of the first tape prepreg group, the second tape prepreg group, and the third tape prepreg group overlap each other, the first tape prepreg group, the second tape prepreg group, and the third tape prepreg group each including reinforced fibers continuously in a longitudinal direction thereof; and forming, by heating under pressure, the first tape prepreg group, the second tape prepreg group, and the third tape prepreg group laminated on the forming die, wherein the lattice-shaped groove of the prepared forming die is formed so that the crossing regions, in each of which two different tape prepreg groups overlap each other, are brought into contact with each other and gathered at one place, and is further formed so as to have a width smaller than a tape width in non-crossing regions, in each of which one tape prepreg group is laminated without crossing another tape prepreg group, and wherein the laminating comprises: laminating, in each of the crossing regions, the two of the first tape prepreg group, the second tape prepreg group, and the third tape prepreg group in an overlapping manner without being folded so that the tape width is maintained, and laminating, in each of the non-crossing regions, in part of the lattice-shaped groove which is narrower than the tape width, one of the first tape prepreg group, the second tape prepreg group, and the third tape prepreg group in a state of being folded as two layers in a width direction thereof.