| 摘要 |
PROBLEM TO BE SOLVED: To improve molding performance, high rigidity, abrasion resistance, and a heat resisting creep by carrying out annealing treatment on a fan formed of a synthetic resin material made by mixing a styrene-acrylonitrile resin (AS resin) with glass fibers at a specified rate, by means of far infrared radiation within a specified temperature range. SOLUTION: When a blast fan made of a resin is manufactured, an end plate, a blade part, and a separation plate are molded by using a synthetic resin material formed by mixing a copolymerization resin containing acrylonitrile styrene with glass fibers of 30 to 40weight%. After they are formed integratedly with each other, annealing treatment is carried out by means of for infrared radiation within the temperature range of 80 to 100 deg.C so as to complete the manufacture of the blast fan. A copolymerization resin formed of styrene and monomer to which heat resistance is applied is used as the resin, and carbon fiber may be used instead of glass fiber. The annealing treatment carried out by means of far infrared radiation, is carried out by heat of a plane heater, and more preferably, a specified far infrared radiation wave length range which is radiated from the plane heater is set to 2 to 7μm.
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