MULTI-STAGE IMPINGMENT DRYER FOR OPC DIP COATING
Original Publication Date: 1996-Feb-29
Included in the Prior Art Database: 2004-Apr-07
Xerox Disclosure Journal
Disclosed is an improved dryer apparatus for drying dip coated photoreceptor drum and belt articles utilizing impingement drying of the photoreceptor outer coated sul'face and impingement heating ofthe photoreceptor internal or back surface with airlkom a porous cylinder. The porous cylinder provides a source ofheated drying air and acts as an air bearing which enables gentle rotation of the photoreceptor article during the drying process by low torque drive rollers positioned at one or both ends ofthe photoreceptor substrate. The porous cylinder and photoreceptor in coaxial and concentric relation are positioned within, for example, a semicircular housing equipped with at least one pel'forated plenum, which plenum delivers, as desired, low, medium,or high velocity impingement drying air to the outer sdace ofthe photoreceptor article. The aforementioned drive rollers rotate the substrate while heated and humidity controlled air is driven to the inner and outer sdaces ofthe photoreceptor thereby uniiormly and rapidly drying the photoreceptor article and producing enhanced drying rate elEciencies. An optional exhaust plenum or manifold can be positioned in close proximity to the photoreceptor article being dried to e'fficiently remove out-gasing components and volatiles for containment and or reuse. Advantages ofthe multi-stage impingement dryer over, for example, convection dryers include: a reduction in drying times on the order of about 50 percent; a reduction in aoor space or footprint of the dryer apparatus; and a reduced volume requirement for heated air on the order ofabout 30 percent.