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 to develop new roll cover materials that deliver uncompromised sizing and coating performance with both grooved and smooth rods.
Valmet Sizer Roll Cover CF*, our polyurethane cover with excellent wear resistance, features a high-quality coating film formation for worry-free operation. The same expertise allows us to introduce an unmatched backing roll cover for blade coaters: Valmet Coater Roll Cover CC**.
No universal covers have previously been available for swing machines alternating between film coating and sizing. Until now, covers have been suitable only for sizing or coating, but not for both. As a result, lots of applicator rolls and frequent roll changes were needed. Now, Valmet Sizer Roll Cover CF offers a long-awaited solution to this need.
Film coating with smooth rods raises the challenge of scratch resistance, as
pigment coating particles tend to scratch the smooth cover and spoil the
coated surface. Many papermakers have experienced this problem with competing covers. Valmet’s patented solution prevents scratching and provides the highest coating grammage possible without any orange peel or other surface defects.
In order for the same applicator roll cover to work in both sizing and film coating, it has to function well with grooved rods without wearing them down or changing the CD profile of the sheet. The physical properties of the cover also need to be compatible with the sizing chemicals and process temperatures being used. The dependably uniform Valmet Sizer Roll Cover CF incorporates all of these features. It has demonstrated that swing machines can successfully use the same rolls for both sizing and coating. It has also set a new record for continuous operation.
The same uncompromising development has been achieved for blade coater
backing roll covers, resulting in Valmet Coater Roll Cover CC polyurethane cover. With minimum cote weight variation even at the edges, it provides the longest possible runs. Alongside Valmet Sizer Roll Cover CF and Valmet Coater Roll Cover CC, we offer a number of other covers for sizing and coating, depending on the case and customer need. There are several rubber-based products with hundreds of references, as well as other polyurethane covers and ceramic hard coatings for extended service life. Valmet’s product specialists are available to offer assistance in selecting the perfect roll cover for your needs.
*earlier known as CoteFalcon **earlier known as CoteCondor