Valmet Technologies, Inc.

Metso Paper Inc.

Ville Ruola

Christer Hedlund

Håkan Sjöström

Petteri Vuorio

Peter Bergqvist

Anders Hawen

A blade element () for a conical portion () of a stator () of a refiner (). The blade element () has a feed end (), a discharge end (), and a refining surface () which has a feed zone () at the feed end () of the blade element (). The feed zone () of the blade element () has at least one guide groove () extending from the feed end () toward the discharge end () for guiding a flow of material to be refined from the feed end () toward the discharge end (). The depth of the guide groove () is arranged to change in a direction transverse in relation to the extending direction of the guide groove ().

Blade element

A refining surface () of a refiner for defibrating lignocellulose-containing material has a feed edge () and a discharge edge () and has a first blade groove () and a second blade groove (), with a blade bar () therebetween. A distance (D, D, D) of the bottom () of the first blade groove () and the second blade groove () from an upper surface () of the blade bar () is arranged, at least in a part, to change substantially continuously in a direction of travel (A) of the blade grooves. The distance of the bottom of the second blade groove from the upper surface of the blade bar deviates from the distance of the bottom of the first blade groove from the upper surface of the blade bar at substantially the same distance (SD) from the feed edge of the refining surface.

Refining surface for a refiner

A refining surface () of a refiner for defibrating lignocellulose-containing material has a first blade bar () and a second blade bar () with a blade groove () therebetween. A third blade bar has a rising guide surface () for guiding the lignocellulose-containing material to an upper surface () of the third blade bar. The third bar guide surface is arranged, in the direction of travel of the first and the second blade bar (), at least partly between the first and the second blade bar, between the first blade bar and an imaginary extension of the second blade bar, between an imaginary extension of the first blade bar and the second blade bar, or between the imaginary extensions of both the first and the second blade bar.

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Helsinki, Finland

Ville Ruola