Sizer roll covers for board and paper making

Excellent paper quality with sizer roll covers

Roll covers for sizers (earlier CoteFalcon, GuideOnyx, RayFlex, SizeGem, SizeHawk)

The film sizing and film coating process have a direct impact on paper and board quality, both on paper strength as well as on paper appearance. Moreover, as on-line processes they are critical for the paper machine line efficiency. This puts high demands on the sizer roll covers.

Excellent film formation for good board/paper quality

Long grinding intervals for economics in operation

Reliable process with durable and stable covers

Wide range of roll covers for film sizers, spray sizers and pond sizers

For sizing, pigmenting and coating Valmet offers a wide range of soft and hard rubber and polyurethane covers, as well as hard composite covers and ceramic coatings.

The Valmet sizer roll covers are suited for all types of sizers such as film sizers, spray sizers, pond sizers and GRSPs. Valmet sizer roll covers produce excellent paper quality due to the uniform coat weight and film profiles reducing skipping, splashing or misting. Long roll cover running time makes production cost-efficient and of low maintenance.

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Cover solutions for trouble-free sizing process

Valmet Sizer Roll Cover SH-W and Valmet Sizer Roll Cover CF have been developed from special rubber and polyurethane materials that contribute to a trouble-free sizing process. They are high performing covers with wear resistant for maintaining both CD profile and surface roughness, for long running times with high stable film amount. The long lists of deliveries confirms the excellence of these covers.

And we continuously strife to improve on our performance, the recently introduced composite cover for pond and spray sizers offers increased running time compared to hard rubber covers, while being more affordable than hard coating.

Improving board and paper quality with the help of iRoll Sizer

Quality defects due to CD profile issues, e.g. variation of coat weight profile, result in lower material efficiency and higher costs per ton. New opportunities to improve board and paper quality are created with better profiling of coating and sizing through the simultaneous measurement of the roll nip and applicator rod profile online. The full benefits of iRoll Sizer are available with Valmet polyurethane roll covers.

Find optimal roll covers for every board and paper process

Explore our roll cover products targeted for sizing from interactive demo. By exploring this roll cover application tool you can easily see different cover options for every board and paper making process.

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References and articles

Discover how Valmet Sizer Roll Cover CF improves sizer operational efficiency

Ningbo Asia Pulp & Paper’s PM 2 started operations in 2014, with a designed operating speed of 1,400 m/min. It mainly produces white cardboard and liquid packaging board. As the global benchmark machine for white cardboard production, the current maximum operating speed has surpassed 1,500 m/min.

New sizer roll cover boosts performance at Palm Wörth

Palm Wörth installed a Valmet Sizer Roll Cover CF on their BM6 containerboard machine to improve its performance. The new roll cover has a running interval of more than 200 days, leading to higher machine availability and better paper quality.

Uncompromised roll cover performance for sizing and coating

Valmet is the market leader in ﬁlm coaters and sizers, and has developed a great deal of related process know-how. We have put this expertise to good use in developing new roll cover materials that deliver uncompromised sizing and coating performance with both grooved and smooth rods, as well as with coating blades.

Soft rubber covers for sizing

Sizing adds value to the paper quality by enhancing its properties. Sizing paper with starch can increase both the surface strength of the paper, as well as the bulk strength. Sizing or pigmenting can also be applied with PVA or silicone which transforms the base paper into release paper.

Sizer roll cover lasted for 55 weeks

“The roll replacement cycle was far too short, so we needed covers that would better withstand wear and deformation. The potential performance offered by Valmet Sizer Roll Cover SH convinced us,” says Mill Service Manager Harri Siitonen.

Tune up your profiles and runnability with iRoll Sizer

PM 2 at the Stora Enso Anjala mill offers a good example of how the iRoll Sizer, Valmet’s intelligent roll for the sizer, can help to solve runnability challenges and optimize coat weight profiles.