The Yankee dryer is a large, steam-heated, pressure vessel that is used in the production of tissue grades. Two critical operations occur at the Yankee – the sheet is dried to its final moisture target, and it is creped to add bulk, stretch, and softness to the sheet. The design and construction of Yankee dryers has evolved over time to optimize these two operations and also provide a safe work environment for the people who work around them. This course describes the major external and internal components of a Yankee dryer installed on a tissue machine, and the purpose or function of each component.
• The major external and internal components of a Yankee dryer
• The purpose or function of each component
• The importance and impact of the Yankee crown and shell thickness
