Filters
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.
Insights ● Article
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.
Insights ● Article
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.
Insights ● Article
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.
Insights ● Article
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.
Insights ● Article
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.
Insights ● Article
Balancing rolls - balance and imbalance, isolating the problem
Unbalanced rolls hammer at the framework of the papermachine, leading to worn journals, bearings and covers. Balancing rolls lengthens component lifetimes.
Insights ● Article
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.
Insights ● Article
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.
Insights ● Article
Energy consumption minimization in LC refining (webinar)
Low-consistency refining uses a significant amount of a mill's electricity consumption, especially refining in paper/board grades based on virgin fibers.
Insights ● Article
