| 摘要 |
PROBLEM TO BE SOLVED: To provide a wooden door avoiding warping arid twisting over a long period and having excellent fire resistance. SOLUTION: Carbon fibers are laid in a line and integrated together between a surface decorating member 5 and a core 8. The carbon fibers are bundled into a hardened sheet 6 using a thermosetting resin as a matrix. Further, the hardened sheet is formed into three layers comprising a porous sheet, a resin- impregnated carbon fiber sheet, and another porous sheet.
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