Importance

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Abstract

The invention relates to an arrangement for fractionating a suspension of fibrous material suitable for creating a web of paper, board, tissue or some other fibrous material into a short fiber fraction with a high proportion of short and/or stiff fibers and/or vessel cells and a long fiber fraction with a high proportion of long and/or flexible fibers, comprising a screen element with screen openings which is taken past at least one nozzle which directs a jet of the fibrous material suspension onto the screen element, wherein the long fiber fraction is collected on the side of the screen element that is facing the nozzle and the short fiber fraction is collected on the opposite side of the screen element. In this case it is intended to make the fractionating easier and/or more efficient by the screen element being cylindrically formed and mounted rotatably about the cylinder axis and/or by most of the screen openings, preferably all the screen openings, being formed as elongated slits which extend, at least over part of their length, in an inclined manner in relation to the direction of movement of the screen element, or by the screen element having a honeycomb structure.

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First Claim