The task of the tissue machine press section is to remove water. Wet pressing increases sheet dryness in order to ensure adequate paper machine drying capacity. The most effective way to reduce the energy consumption in a tissue machine is to increase the ingoing dryness to the Yankee dryer. Saving energy is today very important and will become even more important in the future.
The press section also has a major impact on tissue quality as softness and bulk, and machine performance.
For a long time, most new Advantage DCT machines were supplied with a single press nip using a suction roll with linear load of less than 100 kN/m. At that time, there was more focus on sheet quality compared to dryness.
Both energy saving and high sheet quality
The introduction of the Advantage ViscoNip press has made it possible to reach high press dryness levels together with high sheet quality. Yankee dryers can today be designed for linear loads up to 150 kN/m. Recent development in the ViscoNip technology make it possible to reach high press dryness levels already at 90 kN/m, which makes it interesting for rebuilds of existing machines. Since the introduction of the Advantage ViscoNip press in early 2000’s, it has grown to be the most common press concept delivered for new Advantage DCT machines.
The introduction of new Hybrid machine technologies has also introduced new press concepts using the shoe press technology, SymBelt press in a pre-press position before the Yankee dryer. This is done to maximize press dryness vs. tissue product ratio.