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Winding principles part 2 - effect and elements of nip pressure

The relationship between rider roll pressure and shipping roll hardness is neither simple nor direct. This second article in the Winding Principles series explores the interrelationship between rider roll pressure, relief pressure, roll weight and nip load.

Reel primary arm nip relief methods reduce bottom waste at turnup

Excessive bottom waste occurs during turn-ups where there is insufficient primary arm nip relief at the reel. To avoid this, primary arm nip force control should start before turn-up and continue smoothly as the building parent reel travels down along the reel drum to the secondary arms at the kickout rails.

Winding principles part 3 - drum torque control methods, summary

When web tension and drum nip pressure are constant, drum torque will assure uniform or diminishing roll hardness from the core toward the outside of the rolls.

Keys to optimize drying efficiency; start with the felt tension

Increased felt tension can optimize drying efficiency and improve paper quality. However, a thorough evaluation of machinery and close monitoring of felt tension, along with a complete maintenance program, are the keys to a headache-free dryer section.

Understanding coating viscosity, rheograms and rheology problems

Coating rheology is measured with low shear and high shear viscosity instruments. In coating rheology, viscosity is the measure of the resistance of a coating formulation to an imposed flow.

Floor protection in recovery boilers with decanting floors

Optimizing both the floor protection methods and materials and the cooling, washing and cleaning practices can yield significant savings in mill outage time and corresponding increases in mill production and reduced risk of mechanical damage due to mechanical cleaning or hydro blasting during floor cleaning.

Explanation of size press edge wipe operation and proper setup

Improper setup of the edge wipe when running starch means poor doctoring results outside the sheet path. Extension past the holder is a critical part of setup.

Measuring multivariable controller performance: how to tell if your multivariable controller is doing a good job

Multivariable controllers have been in use in manufacturing and production systems for many years. Multivariable controllers typically ...

Simple steps can prevent valve issues during start-up

Unexpected problems in flow control equipment are the bane of all process engineers looking to start up projects on schedule. Valves are often (incorrectly) identified as being ‘bad actors’ as the root cause tends to lie elsewhere, is the experience of Valmet’s Mr Börjesson. Better on-site practices could be the solution, is his message

Using digitalization to boost efficiency

As a valve manufacturer, Neles’ goal is to meet the customer’s current and future expectations. Those expectations, are often focused on getting the maximum availability out of their valves and systems. That’s why Neles can supply not just products, such as control valves, actuators and positioners, but also a whole suite of related services.