| 摘要 |
PROBLEM TO BE SOLVED: To provide a formed glassfiber article suitable for the use at a high temperature, keeping the flexibility of the constituent fiber and relatively easily formable to a complicate form at a low cost and provide a method for forming the article. SOLUTION: A core material 11 for vacuum insulation use consisting of a formed glassfiber article is produced by a process comprising an attaching step to immerse a needle mat 1 obtained by the needling of glassfibers in an aqueous solution of a silica sol 2 and squeeze the mat with a roller 4, a compression-molding step to place the mat between a pair of upper and lower heated plates 5 of a hot press and bond the fibers with an inorganic binder attached to the glassfibers to form a compression-molded plate, a welding step to heat the formed needle mat 1 in an electric oven 8 and keep the mat at a temperature lower than the softening point of the glassfiber to weld the glass fiber to the inorganic binder or weld the contact point of the glassfibers with each other and a solidifying step to take the needle mat 1 out of the electric oven 8 and spontaneously cool the mat to solidify the bonded points.
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