Tissue Making Process Testing
Several characteristics of stock and water flows to and around a tissue machine are often monitored and/or controlled for multiple reasons. This module will cover pH, consistency, temperature, freeness, and charge demand.
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Course Details
Learning Objectives
• Explain why stock and white water flows to and around tissue machines are often monitored for pH, consistency, temperature, fiber size distribution, freeness, and charge demand
• Explain what these process tests 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 stock and white water systems
Specs
Frequently Asked Questions
What is consistency?
Why is temperature important?
What is freeness?
Why is charge demand important?
Why is pH control important?
Sample Video Transcript
Several characteristics of stock and water flows to and around a tissue machine are often monitored and are controlled for multiple reasons, including: to ensure a consistent flow of stock to the tissue machine, to optimize runability of the machine and prevent process upsets including sheet breaks, to optimize the efficiency of chemical additives and the results of various processes including refining, to produce a consistent high quality tissue sheet with the desired sheet characteristics. The following characteristics are often monitored: pH, consistency, temperature, fiber size distribution, freeness, and charge demand.
