Refining and deflaking
Refining plays a decisive role in developing the fiber properties of furnish and the final paper properties such as strenght. Furthermore, it greatly affects runnability of the paper machine. Refining is also a major energy consumer in the mill.
Valmet’s refining experience dates back to the early 1950s with both conventional conical refiners and double-disc refiner. The OptiFiner Conflo design combines the positive features and performance benefits of both refining concepts to meet the requirement for most typical short- and long-fiber refining applications, including recycled-fiber treatment.
For low consistency refining applications, OptiFiner Pro is a revolutionary new refining concept that can replace two traditional refiners and deliver 30% electrical energy savings.
Deflaking may be recommended or required, typically in flash-dried bale pulping and for various coated paper and board grades. By eliminating large particles from broke, deflaking contributes to a reduced number of web breaks and less screening rejects.