| 摘要 |
PURPOSE:To prevent foreign matter from adhering to air curtain boxes. CONSTITUTION:A vertical dryer is formed so as to perform the drying of resin- impregnated base material 1 by being vertically passed through vertically long drying ovens 2. Air curtain boxes 5 are respectively provided at the inlets 3 and outlets 4 of the drying ovens 2. The difference between the temperature of the air blasting out of the air curtain box 5 and that in the drying oven 2 is set to be 50 deg.C or less. The temperature of the air near the air curtain box 5 is prevented from lowering by the air blasting out of the air curtain box 5, resulting in preventing the lower boiling point component of resin from precipitating on the surface of the air curtain box 5. |
