Pressure Screens

SKU: C-953Duration: 26 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

Specs

Training Time: 26 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Pressure screens are used primarily to separate unwanted debris or contaminants from the desirable fibers in papermaking pulp. This is accomplished by flowing a pulp slurry over a surface that has many small holes or slots in it. Most of the small flexible fibers pass through the openings, and are accepted, and the larger particles which cannot pass through the openings are held back, or rejected. A typical pressure screen consists of a vertical cylindrical housing that contains a perforated cylindrical screen basket. Within the basket is a spinning rotor which supports foils or protrusions that run close to the surface of screen. Screen performance is quantified by looking at such factors as the reject rate, debris removal efficiency, and long fiber reject rate.

Learning Objectives

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

  • Explain the purpose of pressure screening
  • Identify the major components of a cylindrical pressure screen
  • Describe how screens are kept from plugging
  • Describe why screening systems use multiple stages
  • List three measures of screening performance
  • Identify controls which affect screening performance
  • List possible causes for pressure screen process and mechanical malfunctions

Key Questions

The following key questions are answered in this module:

What is the primary purpose of a pressure screen?
The purpose of a pressure screen is to separate unwanted debris from desirable fiber in a pulp stream.

What is the purpose of the spinning rotor in a pressure screen?
The purpose of the spinning rotor within the screen basket of a pressure screen is to keep the screen clean and increase the flow of fiber through the screen.

What advantage is gained by using cascaded screens?
No separation process is perfect. Some good fiber is rejected with the unwanted debris in a pressure screen. Rescreening the rejected fiber permits the recovery of the good fiber. Rescreening multiple times is referred to as "cascading" screens, and ensures a high fiber recovery rate.

What is a good strategy for unplugging a pressure screen?
A plugged screen can often be unplugged by reducing or stopping the accepts flow, giving the basket an opportunity to clear itself through the rejects line, and re-opening the accepts valve.

What could be some causes of poor accepts quality?
There are many potential causes of poor accepts quality, but some of the more common possibilities are: low reject rate, a hole or gap in the screen basket, unusually high level of contaminants in the feed or worn slots or holes in the basket.

Sample Video Transcript

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

A typical pressure screen consists of a vertical cylindrical housing which contains a perforated cylindrical screen basket. Within the basket is a spinning rotor which supports foils or shaped bumps that run close to the surface of screen. There are several variations on this design. Some screens are horizontal. Some designs have the inlet flow going to the inside of the basket, some have it going to the outside. One design employs two baskets with the flow being introduced between them. For simplicity, the rest of this module and the illustrations shown will refer to the “typical” screen described above with the feed flow going to the inside of a single basket.

Additional Resources

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

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.