Metso Paper Inc.

Valmet Technologies, Inc.

Valmet Technologies Oy

Kati Lindroos

Håkan Sjöström

Matti Kaarineva

Tomi Iisakkila

Markku Partanen

Jorma Halla

Kauko Vänni

Petri Nyberg

Sakari Soini

Veli-Matti Rajala

Matti Hietaniemi

Juhani Sams

Perttu Lamminen

Elina Pohjala

Jussi Ahola

Pentti Saarenrinne

Kauko Vanni

Håkan SJÖSTRÖM

A refiner comprises at least one first refining surface (') and at least one second refining surface (&#x2032;), which refining surfaces () are arranged opposite to one another and mobile in relation to one another. In the refiner () either at least the first (&#x2032;) or the second (&#x2032;) refining surface comprises refining surface portions () feeding material to be refined and/or refining surface portions () discharging refined material as well as refining surface portions () grinding the material to be refined, on the upper surface of which there are blade bars () and between them blade grooves (). Both in the first refining surface (&#x2032;) and in the second refining surface (&#x2032;) of the refiner () the cross-sectional area (A) of at least some blade grooves () are arranged to change in the longitudinal direction of the blade grooves ().

Refiner and blade element

A refiner () for refining fibrous material has a first refining surface (') and a second refining surface (&#x2032;) arranged opposite to one another and mobile in relation to one another. The refining surfaces have refining surface portions () feeding material to be refined and/or discharging refined material as well as refining surface portions () grinding the material to be refined, on the upper surface of which there are blade bars () and between them blade grooves (). In the refining surface () of the refiner () the cross-sectional area (A) of at least some blade grooves () is arranged to decrease from one blade groove () to the next from the direction of the feed edge () to the direction of the discharge edge () of the refining surface ().

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.

A screen cylinder comprising screen slots () and accept channels () for directing the portion penetrated the screen slots () to an accept side () of the screen cylinder () of the fiber pulp suspension fed into a feed side () of the screen cylinder (). At least one feed side surface () is provided between the screen slots () and the accept channels () comprise at least one first surface () of the accept channel () and at least one second surface (). At least a third of the total length of the accept channel () is arranged in a direction opposite to a feed flow direction (A) of the fiber pulp suspension in relation to a normal () of a tangent () of the screen cylinder (), which is arranged to pass through the screen slot ().

Screen cylinder

The invention relates to a method and a mixer for mixing flows of a papermaking process. In the invention, a first flow is conveyed through a tube, and turbulence is generated in it by means of form parts located on the inner periphery of the tube. The mixing zone of the mixer comprises feed openings on the inner periphery of the tube for feeding a second flow from a feed channel outside the tube into the first flow, whereby the flows are mixed as a result of the turbulence generated by the form parts. According to a preferred embodiment of the invention, at least one form part comprises a feed opening.

Arrangement for mixing flows in papermaking process

The invention relates to a method of mixing pulp components in the manufacture of paper, in which method the pulp components to be mixed are led to a mixing point along tubes arranged inside each other. The pulp component flows are mixed by generating turbulence in them by means of the end of an inner tube, the cross-section of which end is wave-like. This turbulence is guided and its effect is intensified by means of form parts in connection with the mixing point, which form parts are arranged on the inner surface of the outer tube. Further, the invention relates to an arrangement implementing the mixing of pulp components in accordance with the method.

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Lempäälä, Finland

Kati Lindroos