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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.

Helpful tips for size pressing: properties, load, vibration…

Sheet properties when using size include - increased internal, surface, tensile strength, stiffness and roughness; decreased porosity, opacity and whiteness.

Refiners are running at double design capacity, case study

Valmet's latest refiner turbine segment patterns reduces energy consumption while lengthening segment lifetime.

Valmet Breast Roll Shaker 120 enhances board and paper properties

Valmet Breast Roll Shaker 120 improves formation properties such as: sheet strength, surface smoothness, printability and furnish absorption. Its simplified design has a small footprint and it's designed for easy maintenance.