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Steam & condensate 2 - condensate, heat transfer and maintenance
In the second of a two part series, we explain condensate behavior and heat transfer, as well as how syphons are used for condensate removal. We also list the most important maintenance checkpoints for air, steam and condensate systems.
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Valmet Online Learning - reduce your mill's knowledge gap
The current workforce is growing older, with many retiring within three to five years. The new workforce lacks fundamental skills and knowledge. Valmet's online training portal is an affordable alternative to bridge that knowledge gap.
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Web handling, construction & proper setup of bowed roll spreaders
Bowed spreader rolls are the most commonly used spreader roll and are critical to most web handling processes. Learn how the construction, web orientation, cover material and wrap angles play important parts in web handling.
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Proper press maintenance, key operational checks and upgrades
Loading systems are an essential part of the press section. Regular inspection and maintenance are needed on a regular basis to maintain machine high runnability.
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Dynamic roll balancing - why, how, measurement and specification
Although a roll is statically balanced, it may have an eccentric center of gravity which cannot be detected by simple static balance. This will become noticeable when the roll speed is increased, and an end-for-end motion occurs. Dynamic unbalance requires investigation to determine which end, or both, require counter-weighting.
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On-machine grinding increases speed and quality, a case study
At a fine paper mill, despite every effort, sheet breaks had averaged more than six a day for the last several months. Two of the four dryers were shut down and the two functioning dryers would need to be taken off-line soon if nothing could be done...
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Proper coater blade angle measurement, interpretation and setup
Measuring and interpreting coater blade wear angle can avoid problems such as scratching, poor coat weight appearance, wet bleeding and weeping at the blade tip. Correct positioning of the blade on its bevel will optimize sheet smoothness.
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Spreader rolls - principle, problems, solutions and services
Spreaders deal with web instability, using the principles of tension and traction to overcome dishing and interweaving. Valmet spreader roll services ensure spreading efficiency with all-round cost control.
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Improving extended nip press (ENP) performance and blanket life
Since 1980 the Extended Nip Press (ENP) has performed well. But there have been improvements since its initial entry in the market. These include prolonging the blanket/belt and felt life and improving sheet properties with oil lubrication showers, belt brushes, belt wipes, loading piston upgrades and geometry optimizations.
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Supercalender process conditions, variables and grinding
Process variables affecting SC paper production, process conditions affecting supercalender polymer roll life and calender roll grinding recommendations.
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