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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.
Insights ● Article
Solutions to multiple poly roll cover failures, a case study
After blowing two expensive roll covers, a mill asked Valmet to investigate. After checking roll history, nip impressions and coolant, the culprit was an inexpensive part.
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Optimize operations with a Roll Cover and Maintenance Agreement
Sending rolls to multiple suppliers can be expensive, cause a loss in continuity and create extra burdens for roll management. A roll agreement will help.
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Reel backlash due to worn parts causes sheet breaks, case study
Sheet breaks on PM1 are costing thousands of dollars. Valmet emergency service discovers backlash and further analysis provides temporary and long-term fixes.
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Common hydraulic valves – cartridge counterbalance valves
Counterbalance valves prevent oil from leaving a cylinder that is holding a load. Without them, loads would move uncontrollably if oil pressure is lost.
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Stainless steel care, cleaning, surface prep and passivating
Stainless steel is corrosion resistant and maintains a film of chrome oxide over its surface. Under normal conditions this film is self-healing.
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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.
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Conversion projects open the door to new opportunities
Rather than permanently idling a paper machine, why not move into a growing market such as packaging?
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Reeling terminology and how to achieve proper roll structure
Proper roll structure requires carefully controlled winding, to enable the resulting parent reel to be stored and unwound in downstream processes in a trouble-free manner. This article presents a glossary of terms and description of roll structure.
Insights ● Article
