| 摘要 |
Method for contact-free drying of a paper or board web (W). Both infrared radiation and drying air jets are used for drying, by means of which said air jets the web (W) passing through the dryer (10, 20) is, at the same time, supported free of contact. The web (W) is passed first into an infrared drying gap or gaps (10VA, 10VB) and thereupon into an airborne web-drying gap (20V). The infrared radiators (105) in the infrared drying unit or units (10A, 10B) are cooled by means of air currents (FAin, FBin). In the method, before the airborne dryer (20), an in such a way closed infrared drying unit or units (10A, 10B) is/are used whose cooling air is not to a significant extent passed into the infrared drying gap (10VA, 10VB). The dry cooling air heated in the infrared drying unit or units (10A, 10B) is passed through the nozzles (251, 252) of the airborne dryer (20) following after the infrared dryer so as to constitute drying and/or airborne air blowings in its drying gap (20V). |
