Yankee dryer development through stress analysis

The Yankee dryer, Figure 1, is the cornerstone of the crepe tissue process. In less thana single turn of this large castiron pressure vessel, the tissue web is pressed dried and creped. Today, the surface speeds for tissue making may be over 6000 fpm. Stress analysis has guided the development of the dryer since its infancy in the mid 1800's and is indispensable for understanding and resolving operating problems and, most importantly, for providing a methodology for running this critical piece of equipment safely.