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Coated board reel control rebuild reduces waste, case study

A coated board mill reduced bottom waste at the reel and increased board quality, with a rebuild from pneumatic to hydraulic reel control.

Operational basics of Compaction Baffle Filters (webinar)

Producing chemical pulp requires several unit operations involving washing dissolved solids from the pulp. The CB Filter combines two operations in one machine.

Doctor and press fabric streaking cause scuff marking, case study

A paper machine with a tri-nip press experienced sheet quality problems with scuff marking after an outage. Two factors contributed - center roll doctor setup and felt cleaning. This case study details the analysis and resolution of the issues.

Calendering variables, properties, compression and plasticity

Behavior of paper properties during calendering and a description of the mechanisms of smoothness, gloss and web plasticity and response to compressive load.

Shoe press report - users group, onsite service, belts & rebuild

Maintaining your shoe press has a tremendous impact on paper quality and production line runnability. Valmet offers several services to maintain and improve shoe press capabilities, starting with the Shoe Press Users Group Conference scheduled for early 2018.

Stop waste due to cockle wrinkles - avoid contributing factors

Cockle wrinkles, common on light weight paper machines, cause waste paper and rejected rolls resulting from downstream sheet breaks. They are influenced by basis weight variation and high drying temperatures.

The 1 Mile Rule analogy of MD length profiles and bagginess

The greater the relative length differences are, the more severe the baggy lanes will be. Proper monitoring tools such as iRoll can help eliminate them.

Control blade beam deflection to maintain coat weight profiles

Coater beams deflect due to coating temperatures, paper temperatures and the temperature of the environment. Newer and wider coating machines are equipped with beam heating/cooling chambers that can be controlled to maintain a straight beam and hence better coat weight profiles.

Aqua cooling improves calendering results at Ingerois, case study

Valmet's new aqua cooling technology makes the board end-product more lightweight, without compromising functional and visual properties. By ideally conditioning the sheet via effective web cooling, bulk can be improved at target smoothness.

Comparison of hard and soft bearing roll balancing methods

Hard bearing type balancers measure residual unbalance. Soft bearing type balancers use a stroboscope and pickups to measure vibration amplitude and direction.