Metso Paper Inc.

Valmet Technologies, Inc.

Vesa Harju

Olli Tuovinen

Petteri Vuorio

Juha-Pekka Huhtanen

Markku Partanen

Erkka Nieminen

Veikko Kankaanpää

A refiner () for refining fibrous material. And a blade element () for a refiner () intended for refining fibrous material. The blade element () having a refining surface ('), which has blade bars () and blade grooves () between them. The top surface of at least one blade bar () is provided with refining grits (). The blade element () has portions () forming a protruding part extending away above the refining surface () and above the blade bars () or the refining grits () on the refining surface.

Blade element and refiner

An injector of a flotation cell, the injector comprising a feed pipe for feeding a fiber suspension flow into the flotation cell, a mixing apparatus for mixing air into the fiber suspension flow and at least one air feed connection arranged before the mixing apparatus for feeding air into the injector. The injector further comprises a nozzle section which is arranged before the mixing apparatus and comprises an aperture plate provided with apertures and nozzles fixed to the aperture plate substantially at the apertures after the aperture plate, there being open spaces between the nozzles. The air to be fed from the air feed connection is arranged to flow into the spaces between the nozzles and further into the mixing apparatus with the partial flows of the fiber suspension flow entering from the nozzles.

Flotation cell

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Tampere, Finland

Vesa Harju