| 摘要 |
PROBLEM TO BE SOLVED: To reduce the manufacturing cost of a dryer while facilitating handling on maintaining. SOLUTION: The dryer for printed wiring board comprises a plurality of heating chambers disposed continuously wherein a lightweight heat exchanger 3 comprising double tubes forming a spiral channel 7 partitioned by a spiral plate 6 between an inner tube 4 and an outer tube 5 is coupled with each heating chamber 1. The spiral plate 6 is heated by passing exhaust gas 10 through the inner tube 4 and heat is exchanged through the spiral plate 6 by passing atmospheric air through the spiral channel 7 in order to elevate the temperature of the atmospheric air. The atmospheric air is heated additionally by a sheath heater 13 before being supplied to the heating chamber 1. |
