| 摘要 |
PROBLEM TO BE SOLVED: To provide a preliminarily compressed three dimensional structural material improved so that the reduction in hardness hardly occurs even on receiving compression repeatedly. SOLUTION: This three dimensional structural material obtained by bonding the crossing points of a fiber with another fiber by a binder resin is prepared. The hardening is performed against the three dimensional structural material 1 so that the hardness of the thickness part 1a is averaged over the whole of the thickness part. The thickness part of the three dimensional structural material 1 is compressed in the thickness direction. In a state of compressing the thickness part 1a of the three dimensional structural material 1, the thickness part 1a of the three dimensional structural material 1 is covered with a covering member 2 to obtain the preliminary compressed three dimensional structural material. Since the preliminarily compressed three dimensional structural material is compressed in the thickness direction in advance, and since the relatively easily detachable bonded points are detached in advance, the reduction of the hardness hardly occurs even on receiving repeated compression in the thickness direction further afterwards. COPYRIGHT: (C)2006,JPO&NCIPI
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