Added to Cart! Click here to view your cart.

Wet End Chemistry - Papermaking Process Additives

SKU: C-675Duration: 23 Minutes Certificate Included

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: 23 minutes

 Mobile Compatible

Based on: Industry Standards and Best Practices

Languages:

  • English

Chemical additives are used in the papermaking process for many different reasons, and they are often divided into two groups. Functional chemicals directly improve properties of the sheet, while process chemicals affect operations on or near the paper machine. This module covers the second group - process chemicals. It discusses the purpose of some of the more common process additives used on paper and board machines, and describes how they work.

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

  • Describe the composition of papermaking furnishes
  • Differentiate between the two classes of papermaking additives
  • Describe the composition of "anionic trash"
  • Describe the purpose and function of common paper and board machine process additives, including pH control chemicals, charge neutralizers, retention and drainage aids, pitch control additives, biocides, and foam control additives

The following key questions are answered in this module:

How do papermaking process additives differ from functional papermaking additives?
Process additives affect process operations on or near the machine, while functional additives directly improve properties of the sheet.

Where does "anionic trash" come from?
Anionic trash can enter the papermaking process in several ways. It can enter with the incoming fresh water, broke pulp, or purchased pulp, or with virgin slush pulp as residuals from pulping or bleaching operations.

Why is good retention important?
Improved retention decreases the fines concentration in the white water, improves drainage, decreases press felt filling, reduces sheet two-sidedness, improves additive efficiencies, and improves overall machine cleanliness.

What is the best pitch control additive for my machine?
In acid systems, alum can be used to attach pitch to fibers. In alkaline systems, dispersants can be used to prevent pitch from precipitating, or fillers can precipitate the pitch onto the furnish. Lowering calcium and magnesium levels, or adding chelating agents, can also help. The best approach must often be determined by trial and error.

What is the difference between a defoamer and an antifoamer?
A defoamer works by breaking down the foam, while an antifoamer prevents the foam from forming.

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

In Acid Systems, Alum can be used to attach pitch to fibers. In Alkaline Systems, dispersants can be used to prevent the pitch from precipitating. Or fillers like Talc can be added to precipitate the pitch on to the furnish so it is carried out with the sheet. Alternatively, calcium and magnesium levels can be reduced or key lading agents can be used to deactivate them in order to prevent the precipitation of pitch. The best approach for a given mill and machine must often be determined by trial and error.

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

Customer Q&A

Be the first to ask a question about this product

Enter your question, and one of our Customer Care experts will respond via email and also post the answer here.

Ask a Question

Sorry, we're missing some information