Valmet polarized forming fabrics revolutionize water drainage in paper-making
Valmet says that its recently introduced polarized forming fabrics have revolutionized papermachine wire-section water drainage.
“Our polarized forming fabrics have been piloted in paper-machines for over a year now. After the polarized technology entered the market in 2016, we have seen its advantages through our customers’ performance. The machines run cleaner, (the) number of breaks is reduced, retention is higher, just to mention a few. The unique polarized structure makes a big difference in the fabric performance compared to what we have seen before,” says Pekka Kortelainen, product technology manager at Valmet.
Traditionally, all SSB (sheet support binding) fabrics have had direct drainage channels. In the polarized structure, the machine direction yarns on both the paper side and the roll side are shifted to form an off-stacked structure. This special structure removes the direct drainage channels traditionally used in forming fabrics.
According to Kortelainen, the unique polarized structure allows controlled initial drainage in the papermaking process. That improves retention and helps to keep the machine clean. Good runnability and cleanliness reduce breaks and therefore increase production capacity. Cost-savings, for example, are created by being able to reduce the use of chemicals.
Valmet says it has sold about 300 polarized forming fabrics and over 90% of the customers who have tested the new fabric type have seen its benefits and continued to run it on their machines.
Yan Vassart, operations manager at Parenco in Netherlands said, “Our target was to further improve formation without losing our good dewatering and already the first trials proved the advantages of the polarized structures. We were able to significantly improve formation as we wanted but the cleanliness and runnability were also good and the dry content remained excellent.
“Since that first trial, those polarized fabrics have become our standard Valmet design fabrics. Valmet has been Parenco’s key partner in paper machine clothing for over 30 years.
The polarized structure can be utilized in all SSB forming fabric types which makes it suitable for all paper machines.