Search results

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.

Press fabric monitoring explains machine operating performance

Good press felt monitoring and conditioning methods help avoid runnability and quality problems. There is no single approach - but some of the best practices are described in this article.

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.

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.

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.

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.

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.

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.

Introduction to the tail threading process, efficiency and audits

If you can't thread the machine, production stops. Depending on the automation level of your machine, threading can be a safety issue. Achieving and maintaining tail threading efficiency is thus exceedingly important for safety and bottom line performance on machines making any grade of paper, board, pulp or tissue.

Optimize paper machine drying energy with Valmet XT Control

Drying accounts for 80% of thermal energy costs. Optimization of the paper machine hood and air systems with the XT Control system can significantly reduce these costs.