Valmet offers a comprehensive list of suction roll upgrades to optimize production line performance, water and energy use, product quality, running time and reliability. These upgrade services bring additional benefits through tailored modernizations.
This tissue press nip profile optimization allows tissue makers to analyze their nip profiles with actual running conditions, quickly and cost-effectively. As a result, roll profiles can be optimized for even nip profiles, and the outcome can be measured for improved runnability and machine efficiency. Nip profile upgrade lets you tune your tissue press to operate at its best.
In some suction rolls, axial seals are situated on a movable deck which is loaded against the shell with loading hoses. This kind of arrangement is not ideal because moving the seals requires moving the entire deck assembly. With Valmet's axial seal holder upgrade for suction rolls, it is possible to just load the seal and in that way gain numerous advantages.
This modernization relieves seal strips from the suction roll shell during running, improving the energy efficiency of the roll and extending the lifetime of suction roll axial seals and shell thereby providing excellent return on investment.
The operating life of suction rolls can be relatively short if improper bearing lubrication is used. Under certain operating conditions, grease as a lubricant may not be able to transfer the bearing heat and keep the bearings lubricated all the time. Valmet’s grease to oil lubrication conversion improves the lubrication of the bearings and ensures extended maintenance intervals.
Effective internal cleaning systems ensure the reliable operation of suction rolls. Valmet Suction Roll Upgrade Shell Flow uses a cleaning shower to flush the suction roll shell through-holes on the machine from the inside out while the roll is on the machine. Clean shell holes ensure uniform dewatering of the paper web, which helps to keep sheet moisture profiles consistent throughout the roll change interval improving roll operating reliability and paper machine runnability.
The oscillating Suction Roll Upgrade Shell Flow H internal high-pressure cleaning shower can replace a traditional internal suction roll shell cleaning shower. Powerful shell cleaning from the inside out will oftentimes also remove the need for external shell cleaning showers. The new Suction Roll Upgrade Shell Flow H cleaning shower consumes much less water than traditional showers.
A flush-through function allows shower nozzles to be flushed while the roll is running. Its oscillation is based on a reliable pneumatic cylinder. Shells are typically washed during sheet breaks or shutdowns. If requested, it can also be set up for continuous shell cleaning. This upgrade is the perfect fit for ultimate shell cleanliness.
Malfunctions in the axial sealing of suction rolls can cause a sudden loss of vacuum. In a conventional sealing system, the seal hoses are controlled by one pressurized airline, so a failure in one hose will affect all the others. Valmet’s individual seal loading upgrade for suction rolls ensures that your suction roll continues to operate even in the event of a hose failure.
An Edge Blow upgrade significantly improves the efficiency of paper machine pick-up rolls by contributing to more uniform web edge pick-up from the forming fabric. It also keeps trim from travelling with the paper web into the press section.
Proper end seal installation and fit is important to the efficient operation of your suction roll. Too much pressure on the suction roll shell and damage can be done, too little and vacuum leakage saps efficiency from your operation. Valmet's spring and pin system represents the latest thinking in end seal design and efficient set-up. Valmet can now upgrade your suction roll for this latest design.
This axial seal lubrication shower represents the newest technology for improving suction roll seal lubrication. It features an improved showering process and improved moisture profiles, as well as allowing you to reduce your roll's environmental impact through significantly reduced water consumption of up to 50%.
Vacuum chamber indicator lights provide a visual tool for machine operators to assist in adjusting suction roll vacuum zone according to process requirements. Finding the optimal vacuum zone position while the machine is running can be a challenging task since the axial and end seals are located in a rotating shell. With Edge Light upgrade, making these adjustments is easy, and they improve dryness, machine runnability and efficiency. The powerful laser lights show the positions of both the end deckle (CD) and axial seal (MD) while machine operators are finding the optimal vacuum zone position to maximize dewatering while minimizing energy consumption.
An optimal storage environment and conditions are essentials to maximize roll lifetimes. Especially while storing a roll, condensate water may accumulate in some parts of the roll and this can lead to potential corrosion problems. Valmet’s water removal drain plugs for suction and press rolls help to keep the bearing housings dry and therefore prevent corrosion from occurring.
Contact your Valmet representative to learn how to improve your suction roll performance with targetted upgrades.