Unlocking Pulp Performance With Sodium Sulfite
Optimize strength, efficiency, and brightness in thermomechanical pulping.
Sodium sulfite has long been a trusted additive in the pulp and paper industry—and for good reason. When properly applied, it can significantly improve both pulp quality and process efficiency. If your mill is seeking ways to boost performance, sodium sulfite offers several compelling advantages:
1. Enhanced Pulp Strength
Adding just 2–10 kg of dry sodium sulfite per tonne of thermomechanical pulp (TMP) can increase tensile strength by 10–15%. This improvement is achieved through partial lignin dissolution, which softens the fibers and allows them to elongate more effectively during refining. The result is longer, more flexible fibers that bond more efficiently, contributing to stronger final paper products.
2. Reduced Energy Consumption
With softened fibers, refining becomes more efficient. Mills can reach target freeness levels using less energy, while also preserving fiber integrity. This not only lowers operational costs but also extends equipment life and supports sustainability goals.
3. Lower Shive Content
The improved fiber flexibility makes it easier to reduce shives during processing. This leads to a cleaner pulp mix, better yield, and improved runnability on the paper machine—enhancing both product consistency and operational uptime.
4. Improved Brightness
At higher application rates, sodium sulfite also acts as a mild reducing agent, capable of increasing pulp brightness by up to one point. This can be particularly beneficial for mills producing brighter or specialty grades.
Ready to optimize your TMP process?
Contact your Quadra representative to explore the right solution for your mill. Our technical experts can help you tailor the approach to meet your specific production goals.
