| 摘要 |
<p>A horizontal flat bed through drier system for drying a wet web of fibrous material in which air heated directly by burners in the supply ducts is fed to the upper sections of a series of drier units and is drawn through the web and through an air-pervious supporting fabric by suction means connected to the lower sections of the units as the web is carried successively through the units by the fabric and in which air removed from at least one unit adjacent to the dry end of the system is reheated and is supplied to another unit relatively adjacent to the wet end of the system and in which exhaust air from the system is brought into direct heat exchange relationship with fresh air being supplied to the system. Each unit includes adjustable edge deckles forming seals with the underside of the fabric edges and with means providing adjustable fabric edge air curtains for cooling the fabric edges. Means is provided for diverting the heated supply air to the exhaust when the fabric temperature exceeds a predetermined value. At least the unit adjacent to the dry end of the system is provided with suction moisture profile control means.</p> |
