For highest quality coated board or paper, with high smoothness and gloss, in blade coating, Valmet offers a full range of reliable rubber roll covers as well as a high performing polyurethane covers. These roll covers have good wear resistance and strength properties ensuring long grinding intervals and long lifetime.
For highest quality coated paper, with high smoothness and gloss, the process of choice is the blade coater, and here Valmet offers a full range of reliable rubber covers as well as a high performing polyurethane cover. These covers keep the smooth surface finish during their running time for smooth coating profiles. Good wear resistance and strength properties ensure long grinding intervals and long lifetime. The blade coater cover offering ranges from our well proven economical rubber cover to more durable rubber cover to the most durable polyurethane cover.
Valmet Sizer Roll Cover SH 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.
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.
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.
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.