The amount of drying will be highly dependent on the goals of the project. Some converters would like to maximize line speed, others will want to minimize operating costs, and still others may want to increase access to the press deck.
Unless another opportunity exists, we will typically start out by designing the dryer to fit into the same space as the original dryer. We will then make modifications to the size of the dryer to keep in line with the goals of the project.
Based on our experience and the specifications of the processes, we will have a pretty good idea of how many air bars are required for an application. We try to design as much flexibility into the dryer system as possible, which includes making provisions to add air bars if additional drying is required in the future.