| 摘要 |
PURPOSE: A mask is provided, which makes toxic gas blockage and dust collection efficiency high and facilitates respiration. CONSTITUTION: A mask comprises a base material(A) consisting of the high thermal resistance material; and nano-fiber web(B) consisting of carbon nano-fibers. The nano-fiber web is manufactured by carbonizing poly acrylonitrile nano-fibers whose average diameter is 1,500 nanometers or less to 900~1,800 deg.C in the vacuum condition for 5~10 hours. The base material consists of metal, carbon fiber, fluorine resin, or polyamide.
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