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Size press roll wear causes reel wrinkles and culls, a case study

A P&W paper machine suffered from excess wear on the back edge of the bottom size press roll. The problem was traced to the size press synchronization shaft. When the shaft was replaced, the roll wear problem went away.

Five checks at shutdown when inspecting rubber covered rolls

At a shutdown, to determine if the cover should be taken out of service for either regrind or recover, inspect the cover for these five issues.

Review of the types of roll misalignment and alignment methods

Alignment of rollers is critical to keep the web and fabrics running true without wrinkles and tight/baggy lanes. Where the rollers are determines how good the alignment must be.

Troubleshooting cores falling during a winder auto setchange

Every winder core loader eventually runs into the same problem at some point - the cores fall during the set change process. This article lists safety concerns, probable causes and corresponding corrective actions to diagnose and resolve this problem.

Common fluids valves explained: Cartridge pressure relief valve

Pressure relief valves are used to prevent over pressurization in the hydraulic circuit. They are located close to the pumps and reservoir tank or close to the equipment to safeguard from over pressurization.

Projects that pay back

In 2015, Valmet saw the completion of 150 projects – all of which supported individual development and the achievement of our Must-Wins.

Journal inspection, dryer bearing fit and internal clearance

After a dryer front bearing has been removed, the bearing fit and new bearing to be installed internal clearance should be inspected. The following procedures cover journal and bearing inspection.

Machine direction coat weight barring solved, a case study

Chronic machine direction coat weight barring at this mill was traced to reel vibration and solved by installing a compliant reel drum cover.

Webinar presents ways to improve safety around the winder

The batch process occurring five to ten times per hour at the winder represents one of highest potential areas of danger in the mill for operators and maintenance personnel. A free webinar on August 3rd, 2016 explored ways to mitigate this risk. The webinar is now archived and available for playback.

Field Report - Minimizing paper curl

Paper curl is critical for many grades of paper, such as copy machine paper, papers that get coated and printed on and multi-layer paperboard grades.What causes curl and how can it be minimized?