PURPOSE: To prevent dielectric breakdown which starts to progress to the Z- direction through the interface of both yarn of the Z-direction and resin by orientating yarn of the Z-direction in a three-dimensional fabric structural body in the unperforative state to the lamination direction of warp and weft.
CONSTITUTION: A first yarn C1 in the Z-direction is orientated so that thee layers are zigzag sewed at every single tier until the lower part of weft B3 of a third layer from the upper part of weft B1 of a first layer. A second yarn C2 of the Z-direction in orientated so that three layers are zigzag sewed at every single tier until weft B4 of a fourth layer from weft B2 of a second layer. A third yarn C3 of the Z-direction is orientated so that three layers are zigzag sewed at every single tier until weft B1 of the first layer from weft B3 of the third layer. A fourth yarn C4 of the Z-direction is orientated so that three layers are zigzag sewed at every single tier until weft B2 of the second layer from weft B4 of the fourth layer. In other words, C1, C2 and C3, C4 are symmetrically orientated while keeping sharp A2 of an intermediate layer as a symmetrical axis so that the three layers are zigzag sewed by warp at every single tier.
NISHIJIMA SHIGEHIRO
YASUDA JUN
IWATA YASUO
IWASAKI YASUHIKO
YAMATORI KAZUTADA
