| 摘要 |
Method and device for contact-free drying of a paper or board web or of any other, corresponding continuous web . In the drying, both infrared radiation and drying air jets are used, by means of which said air jets the web running -through the dryer is, at the same time, carried free of contact. The moving web is first passed into an infrared drying gap, in which a drying energy pulse of relatively short duration is directed at the web , the power of the said energy pulse being substantially higher than the average drying power of the dryer per unit of area. After the infrared drying gap, the web is immediately passed into an airborne web-drying gap , wherein the web is supported and dried by means of air jets. Air is brought into the infrared unit , which said air, having been heated in the infrared unit , is passed as replacement air and/or drying air for the airborne web-drying unit or units placed after the infrared unit. The air flows to be passed into the infrared unit are passed in connection with -the inlet gap of the web to both sides of the web so as to make accompanying and sealing jets |
