Wet End Steam Boxes

SKU: C-915Duration: 16 Minutes Certificate Included

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.

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.

Ideal for corporate licensing and volume users who also need administrative tracking and reporting on training.

Get this interactive eLearning course into your LMS or learn how you can leverage our LMS to deliver training to your workforce.

Need multiple courses or have lots of users? Just let us know a little more about what you need and we’ll get you some great volume pricing.

 Need help deciding? Compare delivery formats.

Course Details


Training Time: 16 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

On a paper machine, the sheet dryness after pressing is important because it is more economical to remove water by mechanical means at the wet end than by evaporation in the dryer section. One way to increase after-press dryness is to increase the temperature of the sheet when it is pressed. Increasing the sheet temperature reduces the viscosity and surface tension of the water contained in the sheet. This reduced viscosity makes it easier for the water to travel out of the sheet, which increases the dewatering capacity of the press. A common way to raise the sheet temperature is to apply steam with a steam box on the wet end of the paper machine.

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

  • Describe the purpose of wet end steam boxes
  • Explain the relationship between sheet temperature and wet end water removal
  • Differentiate between profiling and non-profiling steam boxes
  • Describe steam box heat transfer
  • List the variables that affect steam box efficiency
  • List the benefits of steam boxes

The following key questions are answered in this module:

What is the purpose of a steam box?
Steam boxes are used to increase the after-press dryness of the paper by increasing the temperature of the sheet.

What is the difference between a profiling and non-profiling steam box?
Profiling steam boxes are divided into sections across the width of the machine. The steam flow to each section can be adjusted to produce a uniform CD (cross direction) moisture profile. Non-profiling steam showers apply steam evenly across the entire width of the machine, so while they do improve dewatering, they cannot address moisture streaks.

Why are steam boxes usually positioned over vacuum boxes or opposite vacuum rolls?
Vacuum helps pull the steam through the sheet so that it condenses in the sheet and not just on the surface. The goal is to have a uniform sheet temperature.

What variables affect heat transfer efficiency?
Steam box heat transfer is affected by basis weight, sheet permeability, sheet moisture, and initial sheet temperature. Heat transfer is also affected by steam flow, the distance to the sheet, vacuum level and position, and the dwell time.

What is the impact on total machine drying efficiency?
Even though steam boxes use steam, total paper machine steam consumption usually decreases. For every pound of steam used in the press section, up to 3 pounds less steam is needed in the dryer section.

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

A typical profiling steam box consists of a steam supply header and a distribution chamber with a perforated plate facing the paper sheet. The distribution chamber is divided into several zones. Each zone has an automatic valve that controls the flow of steam from the header into the distribution chamber. A downstream moisture scanner is typically used to measure the paper moisture. The moisture profile data is then used to control the valves, so more steam is applied to wet zones and less steam is applied to dry zones.

Use the additional resources and links below to learn more about this topic:

Customer Q&A

Ask a Question

Sorry, we're missing some information

How do I log in to watch a video that I have already paid for?

Easy! Moments after you purchase your pay-per-view (PPV) course, you'll receive an email with login details. Just click the link and log in with your user name and password and you're on your way!

I would like to have some of my employees take 5 of your driving related courses, how can i set this up?

We're in the process of making bulk purchases and purchases for multiple users easier. But for now, you can order multiple courses and just let us know who you'd like to assign courses to. With an email for each user, we can set up their training plans and make sure everyone gets the eLearning assignments they need.

How can I get your paper-making courses for free?

Well, we can't blame you for asking... And while we're a for-profit company, there are situations with students and certain educational organizations where we can help out with a selection of eLearning. However, our online courses are extremely economical. And our paper industry courses are in very high demand. So, without knowing more about your situation, we think you'll get loads of value from the $39 you'll spend on any of our premium courses.

Do you have eLearning in Portuguese?

Yes, we do! And in addition to primary English narration, we produce many courses in a growing number of languages, including Spanish, Chinese, Dutch, German, Italian, Japanese, Korean, Polish, Russian, Tamil, and Thai.

I'm unemployed, but I really like your eLearning. 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 eLearning. In the future, we'll have badges for you to use in your LinkedIn profiles.
Added to Cart! Click here to view your cart.