Dryer for drying coated fiber webs and production line for producing coated multi-ply fiber webs

The invention relates to a dryer for drying coated fiber webs, which comprises three air compartments (81, 82, 83) configured to provide drying air blows towards passing fiber web (W). Two of the air compartments (81, 82) are substantially rectangular chambers and located next to each other with two longitudinal back sides towards each other, that third air compartment (83) is a turning air compartment located with a straight surface towards ends of the two rectangular air compartments (81, 82) and having a substantially curved outer, advantageously semi-circular, outer surface. The dryer (80) is configured to form a first longitudinal drying run for the fiber web (W) in a first vertical portion (87), a curved drying run for the fiber web (W) in a turning portion (89) and a second longitudinal drying run for the fiber web (W) in a second vertical portion (88). The dryer (80) further comprises along the vertical portions (87, 88) at a distance from the air compartments (81, 82) at least one blow device (85) configured to provide support air blows to support the run of the passing fiber web (W). The rectangular air compartments (81, 82) comprise an inlet channel (84) and two outlet channels (86) and that the inlet channel (84) is located in between the outlet channels (86) in length direction of the rectangular air compartment (81, 82). The invention relates also to a production line for producing coated multi-ply fiber webs, which comprises a forming section with a head box/head boxes and a forming unit, a press section, a drying section, a sizing section, a calender, a coating section, a reel-up and a slitter-winder, The coating section comprises at least one coater for applying coating onto the multi-ply fiber and that the coater is followed by at least one dryer (80). Keksinnön kohteena on kuivain päällystettyjen kuiturainojen kuivaamiseksi, joka käsittää kolme ilmakammiota (81, 82, 83), jotka on sovitettu aikaansaamaan kuivatusilmapuhalluksia kohti ohikulkevaa kuiturainaa (W). Kaksi ilmakammioista (81,82) on olennaisesti suorakulmaisia kammioita ja sijoitettu vierekkäin pitkittäiset takasivut toisiaan kohti, että kolmas ilmakammio (83) on kääntävä ilmakammio sijoitettuna suora sivu kohti kahden suorakulmaisen ilmakammion (81, 82) päätyjä ja jolla on olennaisesti kaareva, edullisesti puoliympyrämäinen ulkopinta. Kuivain (80) on sovitettu muodostamaan ensimmäinen pitkittäinen kuivatusjuoksu kuiturainaa (W) varten ensimmäiselle vertikaaliselle osuudelle, k