Papermaking Process Testing

SKU: C-740Duration: 31 Minutes Certificate Included

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Course Details

Specs

Training Time: 31 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Several characteristics of stock and water flows to and around a paper or board machine are often monitored and/or controlled. This module will cover pH, consistency, temperature, fiber size distribution, freeness, and charge demand testing.

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

  • Explain the purpose of monitoring the pH, consistency, temperature, fiber size distribution, freeness, and charge demand of stock and white water flows to and around paper and board machines
  • Describe common papermaking process tests including what they measure
  • Define "first pass retention" and identify problems that can result from low retention values
  • Explain how the results of these tests can be used to optimize or ensure machine runnability or sheet quality
  • List safety hazards and safety guidelines associated with sampling and testing stock and white water systems

The following key questions are answered in this module:

What is consistency?
Consistency is the weight percentage of dry fiber in a mixture of fiber and water.

What is first pass retention?
First pass retention represents the percentage of the solids delivered to the former that are retained in the sheet and is an indication of how well fines are retained.

What is freeness?
Freeness measure the drainage rate of water from a dilute pulp suspension. The faster the water drains, the higher the freeness.

Why is charge demand important?
Anionic trash or cationic demand is important to measure because undesirable dissolved materials in the paper machine white water reduce the effectiveness of additives and can cause runability problems.

Why is pH control important?
pH affects chemical additive efficiency and retention, refining, retention, drainage, and formation.

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

Several characteristics of stock and water flows to and around a paper or board machine are often monitored and or controlled for multiple reasons including one, to ensure a consistent flow of stock to the paper or board machine. Two, to optimize run ability of the machine and prevent process upsets including sheet breaks. Three, to optimize the efficiency of chemical additives and the results of various processes including refining, and four, to produce a consistent high-quality sheet of paper or board with the desired sheet characteristics. The following characteristics are often monitored, pH, consistency, temperature, fiber size distribution, freeness, and charge demand.

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

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