Pick-up roll running time extended at Hamburger Hungaria
May 22, 2023
Hamburger Hungaria was troubled by short running times, an unscheduled downtime and extensive maintenance on its PM 7 pick-up rolls. In 2019, Valmet delivered two oil-lubricated pick-up rolls with a two-suction chamber solution to the mill and the running time of pick-up suction roll more than tripled.
We’re very satisfied with the roll performance. With the new Valmet suction roll including a Shell Flow shell cleaning shower and Lock Seal axial seals, we were able to get rid of shell plugging and axial seal wearing issues. Moreover, the roll running time was extended from four to 14 months."
Attila Varga, Technical Manager, Hamburger Hungaria
Summary
Location
Hamburger Hungarial mill in Dunaújváros, Hungary
Customer target
The mill was looking for a solution to extend pick-up suction roll running times by avoiding shell hole plugging and axial seal wearing issues. They had been causing unplanned roll changes every three to four months.
Solution
Valmet delivered two oil lubricated pick-up rolls with a two-suction chamber to the mill. The rolls were equipped with:
High vacuum extensions to improve machine runnability
Lock Seal to improve energy efficiency and extend the lifetime of axial seals and shell
Shell Flow internal cleaning shower
Seal Flow axial seal lubrication shower to reduce water consumption
Edge Blow to improve the efficiency of the pick-up roll
Results
Roll running time was extended from 4 to 14 months
When the first Valmet pick-up roll was removed in a scheduled shutdown, the axial seals were in perfect condition, even after the long running time. They were reused
No additional cleaning work was required during roll operation
With the help of Valmet Suction Roll Upgrade Lock Seal and Valmet Suction Roll Upgrade Seal Flow the mill can achieve energy and water savings
Technical summary - PM7
Start-up date
2009
Grade
100 percent waste-based lightweight brown liner and corrugated medium
Thanks to fewer roll changes and longer service intervals, we have been able to spend fewer hours on roll maintenance,” Varga points out. "In the future, we intend to extend the pick-up running time even more, by up to 24 months.”
