Pay-per-view (PPV) format perfect for individual users.
Get immediate access to this interactive eLearning course online. Must be used within 30 days, expires 48 hours after launch.
Language: English French Portuguese Russian
Great for trainers or groups who need unlimited online access to multiple courses. Available in two ways:
Paper Machine Dryers Series (Details)Includes 8 courses for $299/year. Paper Library (Details)Includes 97 courses for $1,499/year.
Ideal for corporate licensing and high volume users.
Get Convergence courses into your current LMS to track and report employee training. Or contact us to learn more about the advantages of licensing our courses with the Convergence LMS.
Like what you see?
The full course is 20 minutes long and available in a number of affordable formats.
Explore this page for pricing and delivery options.
Training Time: 20 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French, Russian
On 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 that are grouped together into drive sections. Each drive section is equipped with one or two dryer felts to hold the sheet tightly against the heated dryer cans. This improves heat transfer to maximize drying, and also helps control cross-machine direction shrinkage and other sheet distortions. This course discusses the importance of dryer felts, how they operate, typical installation steps, felt guiding components, and the safety hazards that are present around dryer felt systems.
Dryer Felt Design
View Course
Paper Machine Dryer Hood Air Systems
Yankee Dryer Coating
Yankee Dryer Design and Construction
Yankee Dryer Dry Creping Basics
The following key questions are answered in this module:
Why does a dryer "felt" look less like a felt and more like a regular woven fabric?Modern dryer felts are woven to be as porous as possible to allow water vapor to escape. Felted materials do not allow enough air and water vapor to pass through.
Are different styles of dryer felts used in the different dryer sections on a paper or board machine?Felts closer to the wet end, where the sheet is wetter and weaker, are often more tightly woven in order to "pump less air" and prevent sheet flutter and sheet breaks.
What is the purpose of a positioner?The purpose of the positioner is to keep the autoguide centered so that it can make adjustments in both directions at all times.
Why is it important for the felt stretch roll to have a lot of "wrap"?The high roll wrap ensures that the stretch roll movements serve only to change the felt length, and do not affect fabric guiding.
Why are the bottom felts often missing in later dryer sections?The sheet is mostly dry in later dryer sections, and the absence of a bottom felt makes them somewhat self cleaning during threading and sheet breaks.
Below is a transcript of the video sample provided for this module:
Perfect for individual users. Get immediate online access. Must be used within 30 days, expires 48 hours after launch.
DVD alternative for in-person classroom training. Get one or more videos on a USB drive. Content expires after 1 year.
Import our SCORM/AICC compatible eLearning courses into an LMS for administrative tracking and reporting on training.