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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.

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.

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.

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.

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.

Common pulp washing fundamentals – How and why do we wash pulp?

Washing of pulp is a critical unit operation in the fiberline. Although washer designs differ, each type functions to wash pulp using common fundamental principles.

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.

High power generation from recovery boilers: What are the limits?

The energy efficiency of modern recovery boilers, such as Äänekoski, can be improved by introducing high power features. Particularly important are the effect of ash composition and ash treatment.

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.

Valmet reduces fabric change time with no creasing, a case study

A new fabric change system created through cooperation between mill personnel and Valmet improves work safety, significantly shortens fabric change time and increases production time.