The innovative PrimeRotor builds on the success of numerous, globally installed ANDRITZ pressure screens as well as on the excellent operating results obtained with the very latest screen type from ANDRITZ – the PrimeScreen X. The new PrimeRotor is perfectly suited for any screen type available on the market and considerably improves screening efficiency while reducing energy consumption at the same time compared to competitors’ screens in a comparable application.
The ANDRITZ PrimeRotor is the latest open rotor design for fine screening, fractionation and approach flow applications. The innovative, aerodynamic shape of the foil provides the highest capacity with the lowest energy consumption while improving the screening efficiency at the same time. According to Sampo Köylijärvi, Global Product Manager for RCF screening systems at ANDRITZ, “This new and innovative product was developed in response to our customers’ needs. The benefits in energy and material efficiency do give clear bottom-line savings to our customers while also reducing the environmental footprint and impact. This can all be achieved with improved quality, so I could not be prouder of the product and the team behind the achievements.”
The unique foil shape is based on extensive CFD studies and long-term mill testing results on optimized flow patterns in the screening area and provides optimal pressure and suction pulses. The fins on the foil surface guide the stock flow effectively and rapidly towards the reject area, reducing the thickening effect and keeping fiber losses to a minimum. The fins also create an additional mixing zone by generating small micro-turbulences on the foil surface. This improves the screening efficiency, giving the pulp the desired cleanliness.
“The new rotor was launched on the market in 2017 and has since gained enormous interest. The results have been really encouraging and exceptionally good from the first installation onward. Up till now, we have over 200 references running globally. Thus, the new rotor has proven its capability and is now our standard offering in fine screening and fractionation,” says Sampo Köylijärvi.
Below are the results from the latest installations:
Showcase 1: A renowned papermaker in Shandong, China
Project profile: Complete OCC line with LC-pulper and a capacity of 1,000 bdmt/d, for corrugated medium.
The challenge: Produce corrugated medium with the highest quality standards
The solution: Fractionator and fine screens were all equipped with the ANDRITZ ModuScreen F with PrimeRotor.
Results: Superior quality was achieved right from the start-up of the line, and improvements were obtained in terms of stickies, dirt and debris removal efficiency.
| Position | Fractionator | 1stand 2nd stage fine screen |
| Screen type | ANDRITZ ModuScreen F50 | ANDRITZ ModuScreen F50 |
| Rotor and foils | PrimeRotor | PrimeRotor |
| Stickies reduction | up to 97% | up to 94% |
| Dirt reduction | 85% | 80% |
| Debris reduction | 97.5% | 92% |
Showcase 2: An international papermaker in Indonesia
Project profile: Complete OCC line with LC-pulper and a capacity of 1,300 bdmt/d, for corrugated medium.
The challenge: Producing low-basis weight corrugated medium at high board machine speeds requires superior stock quality
The solution: Fractionator and fine screens were all equipped with the ANDRITZ ModuScreen F with PrimeRotor.
Results: Superior quality was achieved, and the rebuilt board machine had excellent runnability right from start up of the line.
| Position | Fractionator | 1stand 2nd stage fine screen |
| Screen type | ANDRITZ ModuScreen F50 | ANDRITZ ModuScreen F50 |
| Rotor and foils | PrimeRotor | PrimeRotor |
| Stickies reduction | 97.5% | 96% |
| Debris reduction | 97% | 95% |
Showcase 3: A papermaker in Jiang Suprovince, China
Project profile: Rebuild of competitor’s OCC line for testliner grades
The challenge: Producing top-quality stock for the top ply of the test liner machine, with a partial split after the existing coarse screening system
The solution: The rebuilt fine screening system was equipped with the ANDRITZ ModuScreen F with PrimeRotor.
Results: The newly installed ANDRITZ ModuScreen F with PrimeRotor showed improved performance in reduction of stickies, dirt and debris.
| Position | Fine screen |
| Screen type | ANDRITZ ModuScreen F50 |
| Rotor and foils | PrimeRotor |
| Stickies reduction | 98% |
| Debris reduction | 85% |
Conclusion
The new rotor is the natural product to evolve from the long history of superior ANDRITZ screening products. It can be installed in any screen type available on the market, in an upflow or downflow, inflow or outflow screen, and is used with white and brown grades. The foils on the rotor are exchangeable, thus reducing spare part and inventory costs. The spacing to the screen basket surface can be adjusted with shim plates to further optimize performance.
“The targets for this product were to improve the energy efficiency while delivering improved and exceptional accept cleanliness at the same time. This is an outstanding product that has already proven its effectiveness,” concludes Sampo Köylijärvi.
