Yankee Dryer Dry Creping Basics

SKU: C-488Duration: 24 Minutes

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

Great for in-person classroom training or as an alternative to DVD.

Includes printable documents and Convergence Video Player for Windows systems. Content expires after 1 year.

Language:  English

Great for trainers or groups who need unlimited online access to multiple courses. Available in two ways:

Yankee Dryers Series (Details)
Includes 6 courses for $299/year.

Tissue Library (Details)
Includes 31 courses for $699/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.

 Need help deciding? Compare delivery formats.

Course Details


Training Time: 24 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

The Yankee dryer is a large, steam-heated, pressure vessel that is used in the production of tissue grades. After the tissue sheet is dried by the Yankee dryer and Yankee hoods to its final moisture target, it is creped and removed from the Yankee by the creping doctor. The "dry creping" process is responsible for the bulk, stretch, and softness that are desirable in tissue grades. This course describes what happens to the sheet during dry creping, factors that influence dry creping results, the design and operation of the creping blade, and blade angles and sheet angles associated with the creping blade.

Learning Objectives

At the end of this module, you will be able to:

  • Differentiate between wet crepe and dry crepe
  • Describe the dry creping process
  • Describe the importance of the Yankee coating in creping
  • Describe the purpose of crepe control
  • Describe creping blade setup and geometry
  • Describe the effect of sheet path angles

Key Questions

The following key questions are answered in this module:

What is dry creping?
Dry creping is creping a fully-dried sheet off the Yankee dryer.

What sheet properties are affected by the creping process?
Creping impacts caliper/bulk, stretch, softness, and tensile strength.

What factors affect crepe quality?
The crepe is affected by the speed difference between the reel and the Yankee dryer, creping blade angles and loading pressure, creping blade length or ""stick out"", sheet adhesion to the dryer surface, and creping blade design and geometry.

What is the blade wear angle?
It is the angle of wear on the creping blade. It is equal to the angle between Yankee tangent line and the back of the creping blade under operating loads.

What is the creping pocket angle?
The creping pocket angle is the angle between the Yankee tangent line and the top edge of the creping blade.

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

The last important angle is the creping angle or pocket angle, which is defined as the angle between the Yankee tangent line and the creping blade surface. The crepe pocket angle is very important in determining the resulting crepe structure in the sheet. Crepe pocket angles typically range from 65 to 95 degrees. It is interesting to note that during production, the creping angle is actually determined by the blade wear angle and the blade grind angle. The relationship between them is described by this equation, creping angle equals 90 degrees minus blade wear angle plus blade grind angle. This means that the creping angle can be increased by either increasing the blade grind angle or decreasing the blade wear angle.

Customer Q&A

I would like to have several employees take multiple courses. How can I set that up?

We're in the process of making bulk course and multiple user purchases easier. But for now, you can order multiple courses and contact us with details on who you'd like to assign courses to. We can set up each user's training plan and make sure everyone gets the eLearning assignments they need.

Can I get a free full-length preview of a course to see what this course covers?

While we do our best to offer details on course contents, we don't normally offer full-length previews. But please contact us with more details for a better understanding of what your organizaton needs and how we can help.

Do I get a certificate when I complete a course?

Yes. All of our courses allow you to print a completion certficate upon successfully passing the integrated test at the end of each eLearning course.

How do I log in to take a course that I have already paid for?

You'll receive an email with login details moments after you purchase your pay-per-view (PPV) course. Just click the login link and enter the user name and password provided.

Do you have courses in different languages?

Yes. While all of our courses are originally produced in English, we develop many courses in a growing number of languages, including Chinese, Dutch, German, Italian, Japanese, Korean, Polish, Portuguese, Russian, Spanish, Tamil, and Thai. Available languages are normally displayed in the Course Details section on each course page.
Added to Cart! Click here to view your cart.