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These basic guidelines help optimize suction roll performance

To optimize the efficiency of and ensure the best return on a suction roll investment, mill maintenance departments should follow some basic guidelines.

The function and proper setup of size press sealing blades

Properly functioning sealing blades in a metered size press prevent air from entering the application chamber while lubricating the blade tip/applicator roll interface. Periodic checks of the blade setup are essential for a long and trouble-free blade lifetime.

Blade doctors - purpose, design, operation, examples and options

Doctors are used to scrape foreign material off rolls or to redirect the web to prevent wrapping around rolls. Doctor components vary, but all blade type doctors will have blade(s), blade holder(s) and beam. Heaters, oscillators, air blows and catch pans are common additional options.

Increasing felt tension overcomes dryer limitation, a case study

This case study involves a paperboard mill suffering from drying limitations. The mill had added spoiler bars but had no room for extra dryer cans. The mill undertook a rebuild to increase felt tension, thus allowing a subsequent machine speedup.

Measuring fourdrinier table stock activity helps formation

On fourdrinier forming sections, stock activity on the table is necessary to improve sheet formation and drainage rate. Too much or too little turbulence causes poor formation. Forming table activity can be observed with the use of a high frequency strobe light.

Troubleshooting chronic wrinkling on a size press, case study

Valmet investigated an issue where a size press was having wrinkling when the nip closed and before the applicator beam was loaded. The culprit was hydraulic.

OptiDry Coat energy savings at Hansol Daejeon, a case study

After rebuilding two board machines with OptiDry Coat technology, Hansol Daejeon is very happy with the energy savings. The successful results with PM 31 were repeated and exceeded with PM 32, with excellent cooperation.

Biomass combustion improves Trollhättan air quality, case study

The inhabitants of Trollhättan, Sweden, breathe much cleaner air than they used to years ago. Over 90% of the district heating in Trollhättan is generated by combusting biomass instead of fossil fuels.

Valmet tissue machine roll covers achieve significant benefits

Valmet’s new polyurethane cover materials extend running periods and reduce maintenance and energy costs on tissue machines.

Guide to dryer section performance, key operating parameters

Here are some notes regarding key operation parameters of the dryer section, starting with the three zones related to effective drying rate.