Metso Paper Inc.

Valmet Technologies Oy

Valmet Technologies, Inc.

Jorma Halla

Kati Lindroos

Markku Partanen

Kauko Vänni

Kauko Vanni

A refiner () for refining fibrous material has a first refiner element () and a second refiner element (). The second refiner element is arranged around the first refiner element in such a manner that the first refiner element and the second refiner element have a common middle axis () such that there is a refining space () between the first refiner element and the second refiner element. The first refiner element and/or the second refiner element are arranged to rotate around the middle axis and the refiner elements have refining surfaces (), through which the fibrous material is fed into or exits the refining space (). The refiner has, in the direction of the middle axis of the refiner elements, at least two feed regions, through which the fibrous material to be refined is feedable into the refining space ().

Refiner with flow guide inside rotor or stator

A refiner () for refining fibrous material has a first refining surface () and a second refining surface (), arranged at least partly substantially opposite to form a refiner chamber () to which material to be defibrated is arranged to be fed. The first or second refining surface is arranged to move in relation to the opposite refining surface. The first refining surface has elongated openings () through which fibrous material to be refined is arranged to be fed into the refiner chamber, and/or the second refining surface has elongated openings () through which fibrous material refined in the refiner chamber is arranged to be discharged. The elongated openings provided through the refining surface are arranged at an angle transverse to the blade bars and blade grooves of the refining surface on the first and/or second refining surface.

Refiner and method for refining fibrous material

A refiner () for refining fibrous material has at least one first refining surface () and at least one second refining surface (), which are arranged at least partly substantially opposite to one another in such a manner that a refiner chamber () is formed between them, to which the material to be defibrated is arranged to be fed. The first refining surface or the second refining surface has openings formed through them and through which fibrous material to be refined can be fed into the refiner chamber or through which refined fibrous material can be removed from the refiner chamber. In addition, a method for refining fibrous material, a refining surface of a refiner and a blade segment for a refiner.

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Valkeakoski, Finland

Jorma Halla