On most conventional paper and board machines, the energy required to dry the sheet to the desired moisture target at the reel is supplied by a series of rotating steam-heated dryer cylinders or cans. This module briefly covers the principles behind this system of drying. It will discusses applications where this system is not the best choice, and where alternative drying techniques can be used. These alternatives include: Yankee drying, through-air drying, infrared drying, impulse drying, and air impingement drying.
Learning Objectives
At the end of this module, you will be able to:
- Identify and describe the major components of a multi-cylinder dryer section
- Describe the principles of operation of multi-cylinder dryer sections
- List some the drying alternatives to multi-cylinder drying
- List the advantages and disadvantages of multi- cylinder drying
- Describe the process and typical components for Yankee drying
- Identify typical products in which Yankee drying is applied
- Describe the process and typical components for through-air drying
- Identify typical products in which through-air drying is applied
- Describe the process and typical components for impulse drying
- Identify typical products in which impulse drying is applied
- Describe the process and typical components for infrared drying
- Identify typical products in which infrared drying is applied
- Describe the process and typical components for air flotation drying
- Identify typical products in which air flotation drying is applied