| 摘要 |
PCT No. PCT/FI88/00078 Sec. 371 Date Jan. 24, 1989 Sec. 102(e) Date Jan. 24, 1989 PCT Filed May 24, 1988 PCT Pub. No. WO88/09845 PCT Pub. Date Dec. 15, 1988.A method for contact-free drying of a paper or board web (W). Both in which both infrared radiation and drying air jets are used for drying, by means of which 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 a flotation 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 flotation dryer (20), and 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). |
