Valmet's innovative calenders are excellent solutions for all paper and board grades. Compaction of the paper surface and its structure improves the surface properties, the most important of which are smoothness and gloss. But on the other hand, paper or board web cannot be condensed too much without loosing bulk. Calendering is a two way street; you need to balance between the opposite properties.
Valmet’s calendering technology provides innovative solutions for all paper and board grades. Calendering is often the last step of the paper manufacturing process, which is targeting to affect paper and board properties. Calenders are also used as pre-calenders before coating or size application.
The type of calendering technology applied is determined by machine process conditions like speed and web width as well as the paper or board quality desired. Every investment you make has to pay itself back in a reasonable time so it is essential to choose the right concept for each application. All Valmet’s calendering solutions fulfill the most important task: no compromises are allowed to reliable operation.
OptiCalender Compact is designed for maximum usability with minimum operational costs, and it provides quality calendering. The simple, integrated structure enables extremely easy start-ups, everyday site operations as well as maintenances. Naturally, this also lowers the required initial investment and operational costs.
Valmet’s multinip calender is used both in off-line and on-line applications. The OptiCalender Multinip loading principle makes it possible to load all nips with the same linear load, resulting in efficient plasticization of paper in the very first nips. Profiling performance is affected by the number of control zones on deflection compensated bottom and top rolls.
Roll cover decisions are complex; the prices, performance characteristics and cover lifetimes vary considerably. Answering these five questions can guide papermakers in making a better choice among today's wide range of roll cover technologies.