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Running clean - reduce contaminants at high speeds

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Running clean - reduce contaminants at high speeds

February 10, 2013 - 14:00

BRUSSELS, Feb. 11, 2013 (RISI) -Keeping the paper machines clean is a constant issue for Saica in Zaragoza, Spain, where 100% recycled furnish is varied. Considering the 1,500-m/min or greater speed of its board machines, the challenge is daunting.

"Dirty dryer fabrics prevent high efficiency, and we get contaminants running through our system, literally!" says Sergio Alonso, production manager of Saica PM 10. "Now, with a series of seven on-line traversing MultiJet cleaning units in place, efficiency is up, and breaks have been reduced. The cleanliness gains at the 1st, 2nd and 3rd slalom groups in the pre-dryer allow operators to optimize free of the contaminants."

The way the Kadant M-Clean MultiJet cleaning system works is by removing contaminants from fabrics with a traversing head system. High-pressure water breaks contaminants loose, followed by effective contaminant and water evacuation, employing vacuum and an air knife.

Sergio Alonso, production manager of Saica PM 10, holding a dryer fabric, before and after M-Clean MultiJet cleaning. “Anybody can see how clean we run, just by looking at a dryer fabric. More impressive is efficiency at a high level, and quality output consistently at or above specifications”

Transformation began at PM 9

"Our management team first selected the Kadant M-Clean MultiJet system for PM 9 in Zaragoza, and most recently at our new mill in England. Cleanliness is the key to high efficiency for 100% recycled mills," Alonso adds.

According to Alonso, it was Roberto Arnaiz, production manager of PM 9, who led the team to install a Kadant M-Clean MultiJet system on that paper machine. Saica had a cleaning system in place, but it could not meet the challenge presented by extremely difficult recycled furnish.

Looking back to the PM 9 trials Alonso comments, "With MultiJet we saw great potential right from the start. Success came both from the robustness and efficiency of the system itself, but also from our joint efforts to maximize results. We found that a modification to the nozzle angle produced even better results.

"Once installed, our belief in MultiJet reached a high level, because dirty fabrics were universally clean on a consistent basis."

Julio Baselga, Saica PM 10 operator: “After MulitJet, fabrics are clean and we see fewer breaks.” Production manager, PM 10, Sergio Alonso is on the right

Fabric life gains

Alonso notes, "We are happy with longer fabric life. We seldom change a fabric because it's dirty." If we have an issue with a particular fabric, we know that its time to consider changing that fabric."

Alonso spent four months in Partington, England (near Manchester), where Saica has recently launched its 400,000-tonne/yr 100% recycled containerboard mill. Adds Alonso, "From our clean energy heat and power station to advanced papermaking and effluent treatment, a wide range of innovations and best practices from Zaragoza were employed, including MultiJet cleaning. We value relationships with suppliers who help us continuously improve."

According to Mats Westinius, managing director of Kadant M-Clean, installations are customized for each application. "To maximize performance, a complete understanding of water pressure, air flow, vacuum levels compressed air pressure, traversing speed, and cleaning frequency is necessary to deal with the range of obstacles presented by difficult furnish."

Martin Koepenick, Innova, has many years' experience covering the pulp and paper industry. He is based in the US.