| 摘要 |
PROBLEM TO BE SOLVED: To improve moldability, producibility and heat resistant creeping performance when an air conditioner is used, in a blowing fan adopting styrene acrylonitrile resin (hereinafter called AS resin) or heat resistant polystyrene resin (hereinafter called heat resistant PS resin). SOLUTION: A fan 1 mis formed by the use of synthetic resin in which 30 to 40 wt.% of glass fiber is mixed in AS resin or heat resistant PS resin. The fan 1 is subjected to annealing treatment by hot air circulation at velocity of 1 to 3 meters per second, under an even oven temperature within the range of 80 to 100 deg.C in case of the AS resin, within the range of 80 to 105 deg.C in the case of heat resistant PS resin. It is thus possible to carry out annealing for a short time compared to a conventional case, and to provide a blowing fan excellent in moldability, rigidity, shock resistance and heat resistant creeping performance with satisfactory producibility. |
