Vibration analysis - introduction to techniques and equipment
This article provides a clear, effective and illustrated introduction to vibration analysis techniques, including principles, equipment and spectral analysis.
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Protect costly soft roll covers with novel mechanical devices
Soft rolls represent a significant investment for mills, yet they are susceptible to damage, especially if the surface temperature varies too much across the face of the roll. This article describes the design, operation and maintenance of some of the most common soft roll protection devices.
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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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Coated board reel control rebuild reduces waste, case study
A coated board mill reduced bottom waste at the reel and increased board quality, with a rebuild from pneumatic to hydraulic reel control.
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Doctor and press fabric streaking cause scuff marking, case study
A paper machine with a tri-nip press experienced sheet quality problems with scuff marking after an outage. Two factors contributed - center roll doctor setup and felt cleaning. This case study details the analysis and resolution of the issues.
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Shoe press report - users group, onsite service, belts & rebuild
Maintaining your shoe press has a tremendous impact on paper quality and production line runnability. Valmet offers several services to maintain and improve shoe press capabilities, starting with the Shoe Press Users Group Conference scheduled for early 2018.
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Web shifting - base paper, misalignment, free span and process
Web shifting can be caused by the paper or by something mechanically wrong in the web path. This article presents typical causes of sheet shifting. Most have to do with alignments, but base paper, drying and coating also have great impact.
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The 1 Mile Rule analogy of MD length profiles and bagginess
The greater the relative length differences are, the more severe the baggy lanes will be. Proper monitoring tools such as iRoll can help eliminate them.
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Hot water modules for calender rolls, recommended maintenance
Calender rolls are heated via heating modules to provide low-variance accurate roll temperatures. Follow these hot water module maintenance best practices.
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The diverse role valves play in the chemical industry
The chemical industry is extremely diverse with more than 60,000 known products. Chemicals are typically split into basic categories including petrochemicals, agrochemicals, specialty chemicals, pharmaceuticals and bio-chemicals, and consumer products. Like all process industries, the chemical industry needs valves designed for safe, efficient and reliable process operation.
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