Up & Running articles
Up & Running articles
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Avoid winder vibration with modern software and hardware tools
Some paper grades generate winder vibration. Modern tools help, such as 4-way hydraulic valves, stiffer drums with lower dynamic runout and automated controls.
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3 Questions on Refining: Interview with a Valmet Expert
Luis Gonzalez, Valmet refining expert, describes the synergy of GL&V, J&L Fiber and Valmet and customer benefits from the combined refining technology.
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Proper bearing lubrication and modernization are essential
Most bearing failures can be traced to two maintenance oversights: a lack of lubrication or the use of the wrong type of lubrication. An upgrade may be needed.
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Field Report - Why balance rolls?
Unbalanced rolls hammer at the framework of the papermachine, leading to worn journals, bearings and covers. Balancing rolls lengthens component lifetimes.
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Case Study - Larger jumbo rolls increase pressroom breaks
Larger wound roll sizes dramatically increased press breaks for an LWC mill's customer. Process analysis and Valmet small fixes provided a temporary solution.
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Case Study - Multiple poly roll cover failures solved
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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Field Report - Hydraulic safety before, during and after maintenance
Hydraulic maintenance should be performed by knowledgeable, trained technicians. Here are some tips for safely and efficiently working on hydraulic systems.
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Case studies: Reduce downtime with press roll maintenance
A scheduled service plan guarantees product quality and machine runnability. Case studies show downtime reduction with Valmet press roll scheduled maintenance.
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Field Report - Calendering variables, paper properties and mechanisms
Behavior of paper properties during calendering and a description of the mechanisms of compressive load, smoothness, gloss and web plasticity.
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Field Report - Supercalendering process conditions, variables and grinding recommendations
Process variables affecting SC paper production, process conditions affecting supercalender polymer roll life and calender roll grinding recommendations.