Metso Paper Inc.

Sunds Defibrator Industries Aktiebolag

Pertti Purolainen

Nils G Virving

Lennart Rohden

Christer Nastren

Anders Hawen

Lars Holmsten

Christer Hedlund

A refining element for use in the refining of fibrous materials is disclosed in which the refining surface includes an inner portion and an outer portion defining a transition region between these two portions, a plurality of bars and grooves in the inner portion of the refining surface, and a plurality of bars and intermediate grooves in the outer portion of the refining surface, the bars in the inner surface having a greater width than those in the outer surface, and the transition region having a varying distance from the inner edge of the refining element across the refining surface.

Refining element

Refining element of a disc refiner

Growing community of inventors

Bro, Sweden

Pertti Purolainen