A solution for jumbo roll bouncing in the secondary arms
A mill reported that their jumbo rolls were bouncing. This started after their reel's flattened secondary arm rollers were replaced with fresh, round rollers...
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Forming section field services identify potential problems
Forming section services diagnose potential or actual problems and their solutions. Scheduled services ensure reliable, safe and efficient operation.
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Indah Kiat Perawang 50% time savings in doctoring, case study
When IKPP Perawang wanted to boost machine runnability and performance, they challenged Valmet's specialists to find potential areas for improvement.
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Two front splicing methods and safety precautions with each
Two efficient winder front splicing methods are presented. Front splicing is more dangerous than rear splicing, i.e. nip hazards. One person should supervise.
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Off-machine coater splicing is affected by several parameters
Splicing efficiency on coaters averages about 98%. Variables that affect the splicing process include primary roll speed match, paster roll speed match, paster roll gap, paster roll pressure, paper caliper/hardness profiles, splice tape pattern and tail length.
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Instructions for safe removal of calender stack rolls and drives
Machine calender rolls are typically removed using a house crane and slings. This article presents typical stack roll removal instructions and safety. Always refer to original equipment supplier documentation and mill procedures for the actual procedures.
Insights ● ArticleExcellent results with suction box showering, rebuild case study
A newsprint mill in southern USA was losing suction in one of their suction couch rolls. A Valmet rebuild resulted in two years of run time with very little internal pulp buildup or seal strip wear.
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Vibration monitoring and analysis in tri-nip press, case study
A paper machine experienced vibration in its tri-nip press on the tending side only. Valmet condition monitoring and vibration analysis used synchronous time averaging (STA) to assist in solving the problem.
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Common fluids valves explained: Pressure reducing valve
Pressure reducing valves are used to create and hold a pressure setpoint in a downstream hydraulic branch. Valmet uses sandwich style valves because they are easy to fit in a stacked hydraulic valve block circuit.
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Measuring applied and residual coat weight on applicator rolls
Starch and coating is applied to the applicator roll using a rotating rod. The amount of coating applied to the roll is the most important variable for good coat weight control. This article describes a method of measuring the wet film on the fly across the size press, using a simple measurement tool.
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