Mitsubishi Paper Mills, PM7 in Hachinohe mill, Japan
“A great reduction in production costs and increase in productivity.”
Paper machine
- Grades: Base paper, fine paper, book paper, LWC paper
- Speed: 1,300m/min
- Production: 13,000 t/month
- Wire width: 5,800 mm
Challenges
After switching to a dual polymer retention system and ECF pulp, first pass retention decreased and the consumption of retention aids increased. This called for a new chemical mixing system to:
- reduce the consumption of retention aids
- improve the first pass retention
- prevent the collection of scale and dirt
- prevent sheet formation problems
Our solutions
- TrumpJet Flash Mixing stations for retention aid polymers (A-PAM and C-PAM).
- Moving A-PAM mixing location after the screen
Results
40% retention aid savings
90 m3/day fresh water savings (reduction of dilution water for A-PAM line)
2,540 kWh/day energy savings (to heat fresh water from 11.8°C to 37°C)
3.5% production increase
8% total first pass retention increase
12% ash first pass retention increase
33% prolonged lifetime of felt and wire
33% extended shut down cycle (30 days → 40 days )
Conclusion
Due to success of the first TrumpJet® injection mixing installation and the potential to decrease chemical consumption even more, a decision was made for a “step two” of the project: injection mixing of C-PAM + AKD after the screen with TrumpJet Chord.
The great reduction in production cost and 3.5% increase in productivity lead to new repeat orders for the other lines.
Have a project in mind?
Our specialists will analyze the potential for chemical mixing optimization in your production line and offer a tailor-made solution for your needs
See more mill results here.