It is chosen for drying paper or nonwoven sheet which requests bulkiness. Circumferential length of air-through saves the drying length, so the installation space becomes more compact.
Because the air passes through the sheet, it gets much higher drying efficiency than the slit nozzle type. Though the density of the sheet dried by contact-drying, such as Yankee dryer, becomes high and it loses bulkiness, this type of drying does not lose bulkiness because the sheet is not pressed to it.
It is also possible to change temperature conditions and wind speed at the formerhalf and the latter half of the circumferential length. It is usable for drying zoneand curing zone.