Brown Stock System Basics

SKU: C-629Duration: 31 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: 31 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

The purpose of a brown stock system is to process the brown stock, and, usually in this order: remove high density trash, break down or remove uncooked wood, and wash black liquor from the brown stock. This module will explain the process steps within a brown stock system, and the various types of equipment which are used to accomplish each operation.

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

  • Describe the purpose of a brown stock system
  • Identify and describe the major equipment
  • Identify and describe the primary process flows
  • Describe the function of a rock trap
  • Describe the function of a screen
  • Describe the function of a washer
  • Differentiate between a fibrilizer and a refiner
  • Describe countercurrent washing
  • Identify and describe the safety hazards in the brown stock system

The following key questions are answered in this module:

What is brown stock?
Brown stock is the name for the mixture of cooked wood chip and cooking liquor that is discharged from a digester.

What is the goal of a brown stock system?
The purpose of a brown stock system is to remove all components of the cooked, discharged pulp mixture from the digester that would interfere with paper or board making.

Why is are rock trap located immediately after the digester?
The rock trap removes dense components such as rocks that might damage downstream equipment.

What is the purpose of brown stock screening?
Brown stock screening relies primarily on size differences to remove components which are no suitable for paper or board making.

What is being washed from the pulp in brown stock washers?
Spent cooking chemicals, or ""black liquor"", is washed from the cooked pulp in the brown stock washers.

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

The brown stock discharge from the digester also contains small pieces of uncooked wood or shives, and other small materials such as rocks, metal, and plastic. These smaller sized contaminants are removed from the brown stock by low consistency screens. The screens contain a cylindrical metal plate that has small holes or slots that allow the acceptable brown stock fibers to pass through, while blocking the contaminants. A screen has a rotor that turns at high speed to sweep the screen plate and prevents plugging by creating a back pressure pulse.

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.